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Патент USA US3050128

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Aug- 21, 1962
J. A. HAEBER ETAL
3,050,117
METHOD AND APPARATUS FOR CEMENTING UNDERWATER WELLS
Filed Oct. 25, 1959
2 Sheets-Sheet l
INVENTORSI
J. A. HAEBER
N. B.
NEWMAN
L. G. OTTEMAN
BY: 6.“. mx
THEIR AGENT
Aug. 21, 1962
J. A. HAEBER ETAL
3,050,] 17
METHOD AND APPARATUS FOR CEMENTING UNDERWATER WELLS
Filed Oct. 23, 1959
2 Sheets-Sheet 2
3,056,117
Patented Aug. 21, 1962
2
its seat, but also tends to cause pressure ?uctuation within
3,050,117
METHOD AND APPARATUS FOR CEMENTING
UNDERWATER WELLS
John A. Haeber, Nicholas B. Newman, and Lloyd G.
Otteman, Houston, Tex., assignors to Shell Oil Com
pany, a corporation of Delaware
Filed Oct. 23, 1959, Ser. No. 848,283
9 Claims. (Cl. 166—21)
the well which increases the possibility of losing circula
tion during the cementing operation.
It is therefore a primary object of the present invention
to provide a method and apparatus for carrying out ce-'
menting operations from a ?oating vessel when it is de
sired to cement well casing in an underwater well where
it is necessary to suspend ?xedly the Well casing tem
porarily above its sealed position.
This invention relates to the cementing of offshore wells
and pertains more particularly to a method and apparatus
for cementing wells from a ?oating vessel positioned over
an o?shore well wherein the wellhead assembly is posi
tioned entirely under water, preferably on the ocean ?oor.
Many problems are encountered in the cementing of
wells drilled at offshore locations, especially where the
well is drilled from a ?oating vessel with the wellhead
Another object of the present invention is to provide a
method and apparatus to carry out well casing cementing
operations from a ?oating vessel when it is desired to
cement well casing in an underwater well while the vessel
is free to move vertically with regard to the well casing
and any associated cementing pipe string employed in the
cementing operations.
A further object of the present invention is to provide
positioned under Water. In general, the equipment posi
a method and apparatus for carrying out cementing oper
tioned at the top of the well, often known as a Wellhead
ations from a ?oating vessel when it is desired to cement
assembly or a casinghead, constitutes a casing suspension 20 well casing in an underwater wellhead assembly which is
body through which one or more strings of casing extend
not provided with side outlets through which fluid may be
and depend therefrom. Originally, the wellhead assem
discharged during cementing operations.
bly is mounted on the top of a conductor pipe which may
Another object of the present invention is to provide
be sunk several hundred feet into an ocean ?oor. There
apparatus adapted to be connected bet-ween the bottom
after, after drilling has progressed, one and usually more 25 of a pipe string and the top of a casing string for tem~
strings of well casing are inserted through the wellhead
the top of each casing string being hung from the Wellhead
porarily hanging a casing hanger off its seat during the
circulation of cement to its predetermined position outside
the casing string.
assembly by means of a casing hanger.
At the time casing cementing operations are carried out,
the well is full of ?uid, either drilling ?uid or seawater.
It is necessary that this ?uid in the Well be allowed to ?ow
It is a further object of the present invention to provide
a method and apparatus for carrying out cementing opera
tions from a ?oating vessel at offshore wells positioned
underwater so that any ?uid in the well can be displaced
assembly and conductor pipe and are cemented in place,
out of the Well. It is a general practice to displace it out
of the well as cement is pumped down a cementing string,
out of the top of the well during cementing operations.
These and other objects of this invention will be under
through the casing string and up the annular space be 35 stood from the following description taken with reference
tween the outer wall of the casing string and the wall of
to the drawing, wherein:
the borehole. When additional strings of casing are in
FIGURE 1 is a schematic view illustrating the opera
serted and cemented in place, the cement is pumped down
tion of positioning a well casing and associated equipment
the innermost casing string while the ?uid in the well is
within a well drilled in the ocean ?oor, said operations
displaced ahead of it and ?ows up the annular space be 40 being carried out from a ?oating vessel on the surface of
tween adjacent casing strings. In cementing operations
the water;
carried out in 'wells drilled on land, the casing suspension
FIGURE 2 is a view, taken in partial cross-section, of a
body or casinghead is usually provided with a side outlet
mechanically-operated temporary well casing support
immediately below the casing hanger seat so that ?uid
means as employed in the equipment of FIGURE 1;
within the well can be displaced out of the annular space 45
FIGURE 3 is a view taken in longitudinal cross-section
outside the well casing while the casing hanger rests on its
of a hydraulically-operated temporary casing support to
seat. In the event that no side outlet is provided in the
be used with the equipment illustrated in FIGURE 1;
casinghead or casing suspension body, ?uid in the annular
FIGURE 4 is a view taken in longitudinal cross-section
space outside the casing can only be circulated out of the
of another type of easing suspension equipment which
well by holding the casing hanger off its seat in the casing- r may be employed to carry out the method of the present
head so as to allow ?uid to circulate past. In most cases,
the casing hanger is not installed until after cementing op
erations have been completed. In cementing operations
on land this operation is accomplished by employing a
derrick with suitable hoist means for coupling to the top
of the string of well casing and supporting it in a manner
such that its hanger is suspended just above the casing
invention; and,
FIGURE 5 is an enlarged detailed view, taken in longi
tudinal cross-section, of a threaded portion of the appa
ratus of FIGURE 1.
Referring to FIGURE 1 of the drawing, a ‘drilling barge
11 of any suitable ?oatable type is illustrated as ?oating
on the surface of the water 12 ‘and being ?xedly positioned
suspension bowl or the casing hanger seat.
over a preselected drilling location by being anchored
With cementing operations being carried out from a
to the ocean ?oor 13 by ‘anchors (not shown) at the end
60
?oating vessel, the vessel from which operations are car
of the cables 14 and 15-. Equipment of this type may be
ried out rises and falls vertically as wave trains pass the
used when carrying on well-drilling operations in water
vessel, which precludes suspending the weight of the cas
varying from about 100 feet to about 1500 feet ormore.
ing string from a derrick on the vessel, as the casing string
The drilling barge 11 is equipped with -a suitable derrick
would necessarily rise and fall with the vessel. The
amount of vertical travel of the casing string and vessel, 65 16 ‘which in turn is provided with a hoist 17, fall lines,
rotary table, as well as other auxiliary equipment (not
which would be a function of the period and wave heights
shown) needed during the drilling and completion of a
of the particular waves passing the vessel, may often be
well. The derrick 16 ispositioned over a drilling slot
of su?icient magnitude so that the hanger, ?xedly secured
or well 18 which extends vertically through the barge
to the suspended casing, would bump its seat within the
casing suspension body or casinghead as the vessel moved 70 in a conventional manner. When using the equipment
of the present invention the slot 18 in the barge 11 may
up and down. Any bumping contact between a hanger
be either centrally located or extend in from one edge.
and its seat not only tends to damage the hanger and/or
8,050,117
3
4
However, drilling operations may be carried out over
support structure may have been positioned on the ocean
end of the marine conductor 24, it may be positioned in
the upper end of the casinghead 21.
Regardless of the elementito which the temporary cas
ing support seating device is attached, it must be posi
?oor, for ease of illustration and description the present
invention will be described with regard to a casinghead
tioned a ‘known ?xed distance ‘above the casing suspen
sion bowl or casing hanger seat 50 from which a string
I
the side of the barge without use of a slot.
While prior to actual drilling operations a wellhead
21 which is ?xedly secured to a base plate 22‘. The lower
end of the oasinghead 21 extends downwardly a distance
of casing 51 is to be hung. In order to hang the casing,
the top of the casing 51 is provided with any conventional
su?icient so that the top of a conductor pipe 23‘ can be
type of casing hanger 5-2 which may be provided with any
?xedly secured thereto in any suitable manner, as by 10 suitable type of seals 53 and is adapted to be seated in
screw threads or welding. The wellhead ‘assembly or
the casing suspension bowl 50. Although for ease in
casinghead 21 may be positioned in place during well
illustration a simple casing hanger 52 is illustrated as be
drilling operations which may be carried out in a manner
ing threaded to the top of the casing string 51, it is real
described ‘in .copending application, Serial No. 830,538,
ized that any type of casing hanger may be employed, for
?led July 30, 1959, and entitled “Underwater Well Com 15 example, one having hold~down slips, etc., and may be
pletion Method.” In accordance with the method de
connected to the top of the well casing in any other suit
scribed in the above-identi?ed patent application, a marine
able manner, as by welding.
conductor 24 is assembled ‘and lowered from the floating
Threadedly connected to the bottom of the lead screw
vessel 11 until its lower end is aligned and seated in the
38, which extends through the bottom of the temporary
top of the casinghead 211 or suitable equipment mounted
casing support device 26 and ?xedly secured thereto, is a
on the top thereof. The marine conductor 24 is prefer
spacer tube 54 which has a suitable connector element
ably positioned within the slot 18 of the vessel 11 but is
55 a?ixed to the lower end thereof which is adapted to
retained therein in a manner such that the vessel 11 is
engage, as by screw threads 56, the top of the casing
able to move vertically independently of the marine con
hanger 52. The length of the spacer tube 54 is critical
ductor 24. Positioned within the marine conductor 24
and should be of a length such that when the temporary
is a pipe string 25 through which cement may be pumped,
casing support device 26 is positioned on its seating ele
and hence is normally called a cementing string. The top
ments 45 and 46, the casing hanger 52 remains a predeter
of the cementing string 25, which is positioned adjacent
mined distance off the casing suspension bowl 50, say,
the vessel 11 above the surface of the water 12, may be
anywhere from about two inches to two feet or more so
connected by means of a hose or pipe to a suitable pump 30 that an annular passageway 57 is provided between the
(not shown) for pumping a cement slurry down through
casing hanger 52 and the bowl 50 whereby fluid in the
annular passageway 60 between the casing string 51 and
the pipe string 25.
Fixedly mounted on the bottom of the pipe string 25 is
a temporary casing support device 26, one type of which
is shown in greater detail in FIGURE 2. The temporary
casing support device 26 may take any of several forms
and may be actuated in any suitable manner, as by the
rotation of pipe string 251 or through the application of
a pressure ?uid through the pipe string 25'. The particular
temporary casing support device 26 shown in FlGURE
2 comprises a housing 27 having two or more landing
dogs 28 and 29 mounted for sliding lateral or radial
movements in a pair of landing dog slots 32 and 33‘. A slip
bowl 34 of any conventional ‘type is formed within the
housing 27 with two or more slip elements 35 and 36
the conductor pipe 23 may be forced upwardly past the
seating bowl 50 during cementing operations. If desired,
in some installations the connector 55 may be secured
against rotation in the threaded top of the casing hanger
52 by means of a low-strength shear pin 61. While the
connector 55 at the bottom of the spacer tube 54 has been
shown, for ease in illustrating, as a screw-threaded con
nection, it is realized that any suitable connection may be
employed between the bottom of the spacer tube and
the top of the hanger, such for example as a J-slot con
nector or other types well known to the art of oil well
drilling.
mounted for sliding movement in the bowl 34 in a manner
If desired, the bottom of the spacer tube 54, which is
actually the bottom of the cementing string 25, may have
such that the outer faces of the slip elements 35 and 36
urge the landing dogs 28‘ and 29 outwardly as the slips
35 and 36 are forced downwardly. The slip elements
'35 and 36 are forced downwardly against spring 4% by 50
62. The cementing stinger is preferably provided with
means of a pressure plate or other element which is rigid
ly secured against vertical movement on a lead screw
an extension secured to it known as a cementing stinger
one or more cementing plugs such as a wiper plug 63
and a follower plug 64 which are preferably secured to
the bottom of the cementing stinger 62 by means of shear
pins. These elements are well known to the art of oil
well cementing and since they do not form a novel part
38 which passes through the threaded portion 39' at the
top of the housing 27. The top of the lead screw is
of the present invention they will not be further described
secured to the bottom of the pipe string 25 so that upon 55 or illustrated here.
rotation of the pipe string from the surface the pressure
In the operation of the method of the present invention,
plate 37 within the housing will either be raised or low
a string of well casing is lowered from a ?oating vessel
ered thus setting the slip elements 1'35 and 36 or permitting
11 (‘FIGURE 1) into the casinghead 21 and down into
them to be released. The landing dogs 28 and 29 are
the well. When the desired length of casing has been
preferably arranged to be held in a retracted position by 60 inserted into the well, the casing hanger 52 is ?xedly
means of compression springs 42 mounted ‘within a slot
secured to the top of the casing on the barge and then the
43 in the housing 27 and bearing against a pin 44' rigid
connector 55, spacer tube 54 and temporary casing sup
ly a?ixed to the landing dog 28 ‘and slidably mounted
within the slot 43.
The landing dogs 28 and 29' of the temporary easing
support device are adapted to move outwardly a distance
sufficient to engage a temporary casing support seating
device which may take the form of individual elements
45 and 46 ?xedly secured to the inner wall of the marine
conductor 24 preferably near the bottom thereof. Al—
ternatively, the temporary casing support seating device
may take the form of a continuous shoulder 47 ?xedly
secured to the inner wall of the marine conductor 24- in
stead of the elements 45 and 46. Also, as illustrated,
instead of the seating shoulder 47 being in the lower
port device 26 are successively mounted one on top of
each other above the top of the casing string hanger 52.
Lastly, the cementing string 25 is connected to the top
of the temporary casing support device 26 and the entire
string of pipe and casing is lowered into the well, pref
erably through a marine conductor, as illustrated. If
desired, the landing dogs 28 and 29 of the temporary
70 casing support device 26 may have been previously set in
their outermost position so that upon contact with the
seating elements 45 and 46 at the bottom of a marine
conductor 24, or with the seating shoulder 47 within the
casinghead 21, the entire string of pipe and casing will he
landed in the manner illustrated with the casing hanger 52
3,050,117
5
5
being positioned a ?xed distance above the casing suspen
most position, as illustrated, prior to running the cement—
sion bowl 50 so that an annular space 57 is formed through
which the ?uid can be circulated or displaced. ‘In this
ing string and the temporary casing landing device to its
described position, the casing and pipe string are ?xedly
positioned on the wellhead assembly and are unaffected
by any vertical movement of the vessel due to wave
action.
'
Cementing operations are then carried out in a normal
manner well known to the art with a hose or pipe (not
shown) being connected to the top of the cementing string 10
25 and a quantity of cement being pumped down the
cementing string 25. As the cement ?ows out of the
bottom of the cementing string it will push the wiper plug
seating position on the shoulder 47 of the casinghead 21.
After cementing operations have been carried out in a
manner described with regard to ‘FIGURE 1, the hoist
on the vessel 11 would be employed to pick up the entire
cementing pipe string to take the weight off of the landing
dog 66 temporarily. A pressure ?uid applied through
the cementing string and the housing 65 passes outwardly
through the pressure port 75 and acts against the dog
holding piston 71 to ‘force it upwardly against the retaining
spring 72. When the bottom of the dog-holding piston
71 is above the top of the landing dogs 66, the springs 68
force the dogs 66 into their inoperative position against
63 ahead of it. The wiper plug 63 in turn forces any
?uid within the well casing 51 down to the bottom of the 15 the outer wall of the housing 65.
well casing and subsequently up'the annular space 60 be
tween the well casing 51 and the conductor pipe 23, thence
outwardly through the annular space 57 between the seat
50 and the casing hanger 52 and ?nally up past the tem
porary casing support device ‘26 and up the annular space
between the cementing string 25 and the inner wall of
If desired, the bottom
of the dog-holding piston may be provided with ‘a retain
ing notch or groove 76 and the top of the landing dog
66 may be provided with a retaining peg 77 for holding
the landing dog 66 against the outer face of the housing
65 when the pressure Within the cementing string 25 is
released.
the marine conductor 24, if the marine conductor is em
ployed. After circulating a predetermined amount of
cement down into the cementing string 25, a ball may
Another form of the apparatus of the present invention
is shown in FIGURE 4 of the drawing with a detail of
a portion of FIGURE 4 being enlarged in FIGURE 5.
be dropped down which blocks the passage through the 25 The apparatus, which may be substituted for that shown
follower plug 64 causing a following ?uid to shear the
in FIGURE 1, comprises an inner sleeve 101 connected
pin holding plug 64 to the bottom of the cement stinger.
to the bottom of a cementing string 117, an outer sleeve
The follower plug 64 is pumped down through the well
102 forming a part of the spacer tube 104, a suspension
casing with water behind it until it reaches the bottom
plug 1103 having a downwardly extending sleeve 124, and
of the casing at which time all of the cement will have
a hanger adaptor 105 connected to a casing hanger 110
been forced up the annular space between the casing string
by means of landing threads 111. The apparatus is de
and the side of the borehole or the inner wall of the next
signed to operate in combination with a marine conductor
most outwardly casing string. At this time, before the
24 or casinghead 21 of FIGURE 1, shown in FIGURE 4
cement sets up in the well, the cementing string 25 is
as element 106, and being provided with an upwardly
rotated in a manner such that the slip elements 35 and
facing shoulder 108 adapted to receive the downwardly
facing shoulder ‘107 of the suspension plug 103 so that
causing the landing dogs 28 and 29 to be retracted by
the weight of the casing string 109 is transferred to the
compression springs 42 so that the entire string of cement
casing suspension body 106, whether it be a marine con
ductor or a casinghead. The casing string weight is trans
ing pipe and well casing may be lowered slightly so that
the casing hanger 52 seats itself in the casing suspension 40 ferred through the casing hanger 110, the landing threads
1111 on the hanger adaptor 105, to the spacer tube 104.
bowl 50. If necessary, the cementing string may be picked
The translatory threads 112 on the outer sleeve 102 trans
up during rotation so that the landing dogs are retracted
36 (FIGURE 2) move upwardly in the slip bowl 34,
more easily.
At this time continued rotation of the ce
menting string releases the connector 55 from the top of
the casing hanger 52 and the connector 55, spacer tube
54, temporary casing support device 26 and the cementing
string 25, are all then withdrawn upwardly to the vessel
11 at the surface.
Instead of the temporary casing support device 26 of
fer the weight to the threads on the inner sleeve 101.
From the inner sleeve the weight is transferred to the sus
pension plug 103 through thrust~bearing 114 and then
to the shoulder 108 of the casing suspension body 106.
The suspension plug 103 is equipped with splines 116
which ?t into grooves along the vertical face of shoulder
108. When the splines are engaged in the grooves it is
FIGURE 1 being of the type that is actuated by rotation 50 not possible for the suspension plug 103 to rotate with
of the cementing string 25, a casing support device of
the type illustrated in FIGURE 3 may beemployed. In
this ?gure, the casing support device is shown as being
seated on a shoulder 47 within the casinghead 21 although
it is to be understood that it could also be seated on a
shoulder at the bottom of a marine conductor, as illus
trated in FIGURE 1, or on any element in between a
marine conductor and a casinghead.
The hydraulically
operated temporary casing support device illustrated in
FIGURE 3 comprises a tubular body or housing 65 hav
ing two or more landing dogs 66 pivotally mounted there
on, as by a pin 67, with a compression spring 68 acting
against the arm of the landing dog 66 to retain it in a
normally inoperative position against the housing 65.
Silda‘oly mounted on the outside of the housing 65, just
above the dogs 66, is a circular dog-holding piston 71
provided with a compression spring 72 thereabove for
normally urging the dog-holding piston 71 downwardly in
back of the landing dogs 66.
O-ring seals 73 and 74 may
be provided between the dog-holding piston 71 and the
outer wall of the housing 65 so as to prevent the escape
respect to the suspension body 106. In FIGURE 4, the
apparatus is shown when the casing weight is suspended
from the suspension body 106, as it would be prior to
cementing of the casing string. While in ‘this position,
cement can be pumped down the cementing string 117
through the tool and the casing string ‘1019 to return up
the well, in a manner described with regard’to FIGURE
1, through the annular space between the casing hanger
110 and the casing hanger seat ‘118, and thence up
wardly through ports 119 provided in the suspension plug
103.
After the cement has been displaced to its desired posi
tion, the cementing string 117 is rotated to the right, how
ever it is to be understood that the tool could be designed
with left-hand rotation at this point. Since the outer
sleeve 102 is locked to the suspension plug 103 by keys
120 which are connected to the outer sleeve and ride in
the key slots 121, the slots 121, being parts of the down
wardly extending sleeve 124 of the suspension plug 103,
prevent the outer sleeve 102 from rotating so that the
translatory threads 112 are fed off the corresponding
' threads on the inner sleeve 101 as the latter rotates within
of pressure ?uid applied through a pressure port 75
'the outer sleeve 102. The feeding off of the translatory
through the wall of the housing 65'.
In employing the form of the apparatus shown in FIG
threads 112 causes the spacer tube 104, the casing hanger
URE 3, the landing dogs 66 would be set in their outer 75 110 and the casing string 109 to be lowered with respect
3,050,117
8
to the casing hanger seat 118 and eventually causes the
casing hanger 110 to rest in the casing hanger seat 118.
ing a marine conductor pipe on the top of said wellhead
assembly to extend from the top thereof to a point above
After ‘the casing hanger "110 has been seated, continued
the surface of the water, lowering through said marine
rotation of the cementing string 117 causes the suspension
conductor pipe and into said well from said ?oating struc
plug 103 to move upward and retract the splines 116 from Ur ture a Well casing having hanger means thereon and
the grooves in the vertical face of the seating shoulder 108
being connected to the lower end of a pipe string, rigidly
of the suspension body 106. When the splines 116 have
supporting temporarily said well casing with its hanger
been completely retracted the suspension .plug 103 is free
means a ?xed distance above the seat in said wellhead
to rotate. As the cementing string 117 continues to be
assembly to form a fluid passageway between said seat
rotated to the right, the locking threads 122 at the upper 1O and hanger means, said hanger means and well casing be
end of the outer sleeve 102 mesh with the stop threads
ing supported from said marine conductor pipe, circu
123 on the inner sleeve 101. At the time that these threads
lating a quantity of cement slurry down said pipe string
are completely meshed, the keys 120 are completely with
and well casing whereby ?uid ?lling the well is forced
drawn from the key slots 121 in the suspension plug 103,
upwardly outside said well casing and through said ?uid
and rotation of the cementing string 117 thereafter causes
passageway between said seat and hanger means, pump
a rotation of the spacer tube 104. The rotation of the
ing a quantity of ?uid down said pipe string and well cas
spacer tube 104 backs the hanger adaptor 105 out of the
ing in back of said cement to force the cement up the
landing threads 111 in the casing hanger 110‘ and re
outside of said well casing, raising said well casing a
leases the spacer tube 104 so that the spacer tube together
short distance to disengage said temporary rigid sup
with the suspension plug 103 can be retrieved from the ~ port, subsequently lowering the well casing to seat the
well by raising the cementing string 117 to the surface.
hanger means thereof in a ?uidtight manner within said
We claim as our invention:
1. In well drilling operations carried out from a ?oat
ing structure, a method of cementing casing in a ?uid
?lled well at an offshore location which comprises drill
ing a well in the ocean ?oor, installing in said well a
wellhead assembly adapted to seat a casing therein, lower
ing into said well from said ?oating structure a well casing
having hanger means thereon and being connected to the
lower end of a pipe string, rigidly supporting temporarily
the hanger means a ?xed distance above the seat in said
wellhead assembly to form a ?uid passageway between
said seat and hanger means, circulating a quantity of
cement slurry down said pipe string and well casing where
by ?uid ?lling the well is forced upwardly outside said
well casing and through said ?uid passageway between
said seat and hanger means, pumping a quantity of ?uid
down said pipe string and well casing in back of said
cement to force the cement up the outside of said well cas
ing, subsequently lowering the well casing to seat the
hanger means thereof in a ?uid-tight manner within
said wellhead assembly before the cement starts to set,
disconnecting said pipe string ‘from said well casing and
Withdrawing it to a point above the surface of the water.
2. In well drilling operations carried out from a float
ing structure, a method of cementing casing in a ?uid
iilled well at an o?shore location which comprises drill
ing a well in the ocean ?oor, installing in said well a well
head assembly adapted to seat a casing therein, position
ing a marine conductor pipe on the top of said welihead -
assembly to extend from the top thereof to a point above
the surface of the water, lowering through said marine
conductor pipe and into said well from said ?oating
structure a well casing having hanger means thereon and
being connected to the lower end of a pipe string, rigidly
supporting temporarily said well casing with its hanger
means, a ?xed distance above the seat in said well
head assembly to vform a fluid? passageway between
wellhead assembly before the cement starts to set, discon—
necting said pipe string from said well casing and with
drawing it to a point above the surface of the water.
4. Apparatus for cementing well casing in a ?uid-?lled
well from a ?oating vessel at an offshore location, said
apparatus comprising well casing suspension body means
?xedly positioned in the top of a well drilled in the ocean
?oor and extending upwardly therefrom, a casing suspen
sion means carried within said suspension body means,
temporary casing-support seating means carried within
said suspension body means above said casing suspen
sion means in spaced relationship therewith, a floating
vessel on the surface of the water positioned over said
suspension body means, a cementing pipe string extend
ing from a point adjacent said vessel down into said sus
pension body means, said vessel being positioned for free
rise and fall movement with respect to said pipe string
during cementing operations, temporary casing support
means connected to the lower end of said pipe string,
a spacer tube connected to the lower end of said casing
support means coaxial with said pipe string, connector
means carried on the lower end of said spacer tube for
detachably connecting a casing hanger thereto, a casing
hanger detachably connected to said connector means and
adapted to seat within said casing suspension means,
the distance between the temporary casing support means
and said casing hanger being at least slightly less than
the distance between said temporary casing support seat
ing means and said casing suspension means, and a string
of easing having its upper end ?xedly secured to said
casing hanger.
5. Apparatus for cementing well casing in a ?uid-?lled
well from a ?oating vessel at an offshore location, said
apparatus comprising well casing suspension body means
?xedly positioned in the top of a well drilled in the ocean
?oor and extending upwardly therefrom, a casing suspen
sion bowl formed within said suspension body means,
temporary casing support seating means carried within
cement slurry down said pipe string and well casing
said suspension body above said casing suspension bowl
‘whereby ?uid filling the well is forced upwardly outside 60 in
spaced relationship therewith, a ?oating vessel on the
said well casing and through said ?uid passageway be
surface of the water anchored over said suspension body
tween said seat and hanger means, pumping a quantity
means, a cementing pipe string extending from a point
of ?uid down said pipe string and well casing in back of
adjacent said vessel down into said suspension body
-said cement to force the cement up the outside of said m 5 means, said vessel being positioned for free rise and fall
well casing, subsequently lowering the well casing to seat
movement with respect to said pipe string during cement
the hanger means thereof in a ?uidtight manner within
ing operations, temporary casing support means con
said wellhead assembly before the cement starts to set,
nected to the lower end of said pipe string, said tem
disconnecting said pipe string from said well casing and
porary casing support means including radially extensi
withdrawing it to a point above the surface of the water.
0 ble and retractable landing dogs and means for retracting
v3. In well drilling operations carried out from a ?oat
said landing dogs upon rotation of said pipe string from
ing structure, a method of cementing‘ casing in a ?uid
the vessel, a spacer tube connected to the lower end of
?lled well at an offshore location which comprises drill
said temporary casing support means coaxial with said
said seat and hanger means, circulating a quantity of
ing a well in the ocean ?oor, installing in said well a well
pipe string, connector means carried on the lower end of
head assembly adapted to seat a casing therein, position 75 said spacer tube for detachably connecting a casing hanger
3,050,117
10
thereto, an annular casing hanger detachably connected
apparatus comprising well casing suspension body means
to said connector means and adapted to seat within said
?xedly positioned in the top of a well drilled in the ocean
casing suspension bowl, the distance between the tem
porary casing support means and said casing hanger being
floor and extending upwardly therefrom, a casing suspen
sion bowl formed within said suspension body means,
temporary casing support seating means carried within
said suspension body above said casing suspension bowl in
at least slightly less than the distance between said tem
porary casing support seating means and said casing sus
pension bowl, and a string of easing having its upper end
?xedly secured to said casing hanger.
spaced relationship therewith, a ?oating vessel on the sur
face of the water anchored over said suspension body
means, a cementing pipe string extending from a point ad
6. Apparatus for cementing well casing in a ?uid-?lled
well from a ?oating vessel at an o?shore location, said 10 jacent said vessel down into said suspension body, said ves
sel being positioned for free rise and fall movement with
apparatus comprising well casing suspension body means
respect to said pipe string during cementing operations,
?xedly positioned in the top of a well drilled in the ocean
temporary casing support means connected to the lower
?oor ‘and extending upwardly therefrom, a casing suspen
end of said pipe string, a spacer tube connected to the
sion bowl formed within said suspension body means, tem
porary casing support seating means carried within said 15 lower end of said temporary casing support means co
axial with said pipe string, connector means carried on
suspension body above said casing suspension bowl in
the lower end of said spacer tube for detachably connect
spaced relationship therewith, a ?oating vessel on the
ing a casing hanger thereto, an annular casing hanger de~
surface of the water anchored over said suspension body
tacha-bly connected to said connector means and adapted
means, a cementing pipe string extending from a point
to seat within said casing suspension bowl, the distance
adjacent said vessel down into said suspension body
between the temporary casing support means and said
means, said vessel being positioned for free rise and fall
casing hanger being at least slightly less than the distance
movement with respect to said pipe string during cement
between said temporary casing support seating means and
ing operations, temporary casing support means con
said casing suspension bowl, a string of casing having its
nected to the lower end of said pipe string, said temporary
casing support means including radially extensible and 25 upper end ?xedly secured to said casing hanger, and
screw-thread means carried by said casing support means
retractable spring-loaded landing dogs, and spring means
for extending said spacer tube to seat said casing hanger
and piston means for retracting said landing dogs upon
on said casing suspension bowl upon rotation of said pipe
‘application of pressure ?uid through said pipe string
string from said vessel.
after cementing operations have been completed, port
9. Apparatus for cementing well casing in a ?uid-?lled
means in said temporary casing support means in com 30
munication between said piston means and the interior
of said pipe string, a spacer tube connected to the lower
end of said casing support means coaxial with said pipe
string, connector means carried on the lower end of said
well from a ?oating vessel at an olfshore location, said
apparatus comprising a well casinghead ?xedly positioned
in the top of a well drilled in the ocean ?oor and extend
ing upwardly therefrom, a casing suspension bowl formed
spacer tube for detachably connecting a casing hanger 35 within said casinghead, an elongated marine conductor
pipe detachably connected to the top of said casinghead
thereto, an annular casing hanger detachably connected
and extending upwardly to above the surface of the water,
to said connector means and adapted to seat within said
temporary casing support seating means carried within
casing suspension bowl, the distance between the tem
said casinghead above said casing suspension bowl in
porary casing support means and said casing hanger be
ing at least slightly less than the distance between said 40 spaced relationship therewith, a ?oating vessel on the
surface of the water anchored over said casinghead and
temporary casing support seating means and said casing
suspension bowl, and a string of casing having its upper
end ?xedly secured to said casing hanger.
7. Apparatus for cementing well casing in a ?uid-?lled
adjacent said conductor pipe, a cementing pipe string
extending down through said conductor pipe and into
said casinghead, said vessel being positioned for free rise
Well from a ?oating vessel at an offshore location, said 45 and fall movement with respect to said conductor pipe
apparatus comprising a well casinghead ?xedly positioned
on the ocean ?oor and extending upwardly therefrom, a
casing suspension bowl formed within said casinghead,
an elongated marine conductor pipe detachably connected
to the top of said casinghead and extending upwardly to
above the surface of the water, temporary casing support
seating means carried within said marine conductor pipe,
and said pipe string, temporary casing support means
connected to the lower end of said pipe string, a spacer
tube connected to the lower end of said temporary cas
ing support means coaxial with said pipe string, con
nector means carried on the lower end of said spacer
tube for detachably connecting a casing hanger thereto,
an annular casing hanger detachably connected to said
a ?oating vessel on the surface of the water positioned
connector means and adapted to seat within said casing
means coaxial with said pipe string, connector means car
its upper end ?xedly secured to said connector means in
suspension bowl, the distance between the temporary
over said casing head and adjacent said conductor pipe,
a cementing pipe string extending down through said con 55 casing support means and said casing hanger being at
least slightly less than the distance between said tempo
ductor pipe, said vessel being positioned for free rise and
rary casing support seating means and said casing suspen
fall movement with respect to said conductor pipe and
sion bowl, a string of easing having its upper end ?xedly
said pipe string, temporary casing support means connect
secured to said casing hanger, and a cementing stinger
ed to the lower end of said pipe string, a spacer tube con
extending concentrically within said casing string with
nected to the lower end of said temporary casing support
ried on the lower end of said spacer tube for detachably
communication with the lower end of said pipe string.
connecting a casing hanger thereto, an annular casing
hanger detachably connected to said connector means and
References Cited in the ?le of this patent
adapted to seat within said casing suspension bowl, the 65
UNITED STATES PATENTS
distance between the temporary casing support means
2,891,770
Bauer et a1. __________ __ June 23, 1959
and said casing hanger ‘being at least slightly less than the
2,909,359
Bauer et al. __________ __ Oct. 20, 1959
distance between said temporary casing support seating
2,917,281
Kofahl ______________ __ Dec. 15, 1959
means and said casing suspension bowl, and a string of
Stratton _____________ _ Mar. 22, 1960
easing having its upper end ?xedly secured to said casing 70 2,929,610
hanger.
FOREIGN PATENTS
8. Apparatus for cementing well casing in a ?uid-?lled
well from a ?oating vessel at an offshore location, said
814,520
Great Britain __________ .._ June 3, 1959
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