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July 30, 1946. 1.. E. BROWN ET AL _ ‘ 2,404,825 WELL TESTER Filed Aug. 50, 1941 2 Sheets-Sheet l 36 l 34 "AIi -.L_?" I >W7IL AV/ ) / 45% 9 ‘\ ,, 47 4a 7' 7 ¢ ' All. 49 7 ‘ 7 awe/rm r 3 3 Luff/£25 BROWN Ozuzv 7V. iVuu/ws July 30, 1946. L. E. BROWN ET AL 2,404,825‘ WELL TESTER Filed Aug. 50, 1941 2 Sheets-Sheet 2 Patented July 30, 1946 ‘ 2,404,825 UNITED STATES PATENT OFFICE 2,404,825 WELL rns'rnn Luther E. Brown, Greggton, and Ollin W. Williams, Mount Enterprise, Tex. Application August 30, 1941, Serial No. 408,916 5 Claims. (C1. 166-1) > 1 V This invention relates to a well tester. An object of the invention is to provide sample taking equipment whereby a sample of liquid or gas may be taken from the side wall of a well a 2 in external diameter and attached to the lower end of this coupling is a drill collar 3 to which a drill ‘4 may be connected. This drill has the reduced channels, as 4a, through which the drill'-' bore at any selected elevation and withdrawn to 5 ing ?uid forced down through the stem is dis the ground surface for inspection without with charged. These channels 4a being reduced form drawing the drill stem. a choke to reduce the velocity of the drilling It is another object of the invention to provide ?uid, for a purpose to be hereinafter stated. equipment of the character described whereby Instead of the drill 4 any other type of choke the sample may be taken while the drill stem is 10 may be attached to the lower end of the drill ?lled with drilling ?uid. Therefore, it is ,not stem, if it should be desired, where drilling is not necessary to lower an empty drill stem into the ‘being carried on and the tool is used solely for well and to subject the same to the risk of col testing. Around the'reduced lower end of the lapslng from the external pressure in order to coupling there is an expansible sleeve-like packer make a test. .15 5 whose upper end may be secured to the coupling It is a further object of the invention to pro 2 bya surrounding collar as 6 and whose lower vide well testing equipment of the character de end may be secured in place by a surrounding scribed whereby a ?uid sample may be entrapped collar as l. The packer when expanded will form from the side wall of the well bore at any se- ‘ a sealed-off area around the walls of the bore lected elevation and maintained under pressure 20 so as to seal off the drilling ?uid from said area. in the sample chamber and withdrawn to the ground surface for ascertaining the pressure thereof and for inspection. - This is clearly illustrated in Figures 4 and 5. The lower end of the reduced portion of the coupling 2 is internally enlarged forming a down With the above and other objects in View the wardly facing shoulder 8 and within said lower ' invention has particular relalz'on to certain novel 25 end there is a sleeve valve 9 having the down features of construction, operation and arrange wardly facing external shoulder In which is ment of parts, an example of which is given in seated on a coil spring H which, in turn, rests this speci?cation and illustrated in the accom ‘on the upper end of the drill 4. The upper end panying drawings, wherein: ‘ of the sleeve valve 9 is enlarged and countersunk Figure 1 shows a fragmentary, vertical, sec 30 in said enlarged portion there is a surrounding tional view of the drill stem showing also the seal ring l2. Beneath the shoulder 8 the reduced packer and valve seats. lower end of the coupling 2 has a discharge port Figure 2 shows a similar view thereof showing . H! which is‘normally closed by the seal ring 42 the lower valve seated. of the sleeve valve 9. The upper end of the Figure 3 shows a cross-sectional view taken on 35 valve 9 is provided with a downwardly tapering the line 3—-3 of Figure 2. seat E4. The port l3 leads from within the Figure 4 shows a fragmentary, vertical, sec coupling 2 and discharges into the packer 5 so tional view of the drill stem showing the packer ,that liquid forced throughthe port 13, as here expanded and the upper valve assembly closed. inafter explained, will expand said packer. Figure 5 shows a similar view with the upper 40 The upper end of the coupling 2 is enlarged valve assembly in open position to admit the internally forming an upwardly facing shoulder sample into the sample chamber. l5 on which a coil spring [6 is seated. There is Figure 6 shows a side view of the assembly with an upper sleeve valve 11 whose upper end is the lower valve closed and the upper valve in ‘ enlarged forming a downwardly facing shoulder position to move downwardly onto its seat to 45 I8 which rests on the upper end of the spring “3. cause expansion of the packer, and The enlarged upper end of the sleeve valve I‘! Figure 7 shows a side elevation, partly in sec has the spaced countersunk seal rings I9 and 20 tion, of the sample receiving chamber and the therein which ?t closely within the enlarged upper valve carried thereby. ‘ upper end of the special coupling 2 and leading Referring now more particularly to the draw 50 out through the upper end of the valve ll there ings wherein like numerals of reference desig is a lateral port 2| located between the upper nate the same parts in each of the ?gures the and lower seals l9 and 20. Beneath the shoulder numeral 1 designates a tubular drill stem as a [5 the passageway through the coupling 2 is re whole. Incorporated into the drill stem there duced forming an upwardly facing shoulder, or is a special coupling 2 whose lower end is reduced 65 stop 22, The downward movement or the valve 2,404,825 4 I‘! is limited by this stop 22 and the lower end upper end of the cylinder 32 and will be forced of the valve is provided with the notches 23 for' the circulation of liquid. The upper end of the on downwardly by the pressure of the pump which forces the drilling ?uid through the drill stem. The drilling ?uid thus trapped within the cylinder 32 and within the coupling 2 beneath valve I1 is downwardly tapered internally form ing a seat 24. Leading from this seat down wardly through the wall of the coupling 2| and will be placed under pressure and the pressure through the packer are the inlet channels 25 exerted against the valve 46 will force the sleeve valve 9 downwardly uncovering the‘ port l3 as whose lower ends are outwardly vturned through the packer wall. That portion‘of the channel shown in Figures 4 and 5 and the ?uid under 25 leading through the ?exible packer 5 is formed 10 pressure will be forced out into, and will expand by a metal tube 26 which is of su?icient strength the packer 5 against the walls of the well bore so that it will not collapse and close the, channel thus forming a sealed-off area of the stratum to when the packer is expanded but which is of be tested. The pump pressure will continue to su?icient ?exibility to readily ?ex when the move the barrel 28 on downwardly until the valve packer is expanded. The upper ends of the chan 36 lands on the seat 24 as shown in Figure 4 with nels 25 are normally closed by the seal ring 26 the ports 4| and 2| in alignment. as shown in Figures 1, 2 and 4. If the packer 5 should be located in a restricted The numeral 21 designates a sample receiving portion of the bore, or if for any other reason,‘ said packer cannot be expanded sufficiently to re chamber having a barrel 23 therein whose upper end is closed by the tubular head 29 screwed . into the upper end thereof and by the cable socket 30 screwed into the upper end of said head, A cable 3| is attached to said cable socket whereby the barrel may be lowered into and removed from the drill stem. The lower end of the passageway through the drill stem is reduced in internal di ameter forming a cylinder 32 and the lower end of the barrel 28 has a surrounding seal ring 33 countersunk therein which ?ts closely within said cylinder 32 when the barrel is lowered. Depend ing from the lower end of the barrel there is a tubular stem 34 whose lower end is closed and which is provided with a side port 35. Slidably mounted onv this stem there is a downwardly tapering valve 36 which is shaped to ?t the seat 24 when seated. The valve 36 has the upper and lower external annular seal rings 31 and'38 coun tersunk therein to form seals with the seat 24 when the valve 36 is seated therein. It also has the annular inside upper and lower seal rings 39 and 46 countersunk therein which form seals with the stem 34. The valve 36 also‘ has a lateral ceive all of said trapped ?uid the excess may escape through the channel 50 leading from with in the packer on up through the coupling 2 to the outside thereof, The portion of this channel 50 through the packer 5 isv formed by a metal tube 5| 2.5 of su?icient strength to prevent collapsing there of when the packer is placed under pressure when expanded. The channel 50 is controlled by an outwardly opening back pressure valve 52 which is normally held seated by a strong coil spring 53 ' 30 which is of su?icient strength to hold the valve ‘ 53 closed until the packer 5 has been fully ex panded and which will open only under excessive pressure to permit the escape of the excess of the trapped ?uid. ' Additional pressure from the pump at the ground surface will now overcome the resistance of the spring 44 and will force theibarrel 26 on downwardly until the port 35 registers with the port 4| as shown in Figure 5. Oil, gas or other 40 ?uid in the sealed-"off area of the wall formation may now ?ow in through the channels 25 into the tubular stem 34 and on up into the sample cham port 4| leading out radially therethrough between ber 28 of the sample receiving barrel 28. The ?uid said upper and lower seal rings of said valve. sample will usually ?ow in under pressure and There is a nut 43 screwed onto the lower end of when the sample has entered the barrel 28 may the stem which forms a stop to retain the valve be elevated by the cable 3|. As the barrel 26 is Men the stem 34 and there is a strong coil spring elevated the spring 44 will ?rst operate to hold 44 surrounding the stem 34 and interposed be the valve 36 against upward movement until the tween the valve 36 and the lower end of the barrel port 35 has moved upwardly to closed position as 21. This spring normally holds the valve 36 in 60 shown in Figure 4 and when the nut 43 engages its lower position on the stem 34 with the seal the lower end of the valve 36 it will also be lifted ring 39 closing the port 31. A ?exible tie member, off of the seat 24 and the spring [6 will move the such as a chain 45, has its upper end attached sleeve valve l1 upwardly to carry the port 2| out to the lower end of thestem 34 and its lower end of registration with the upper ends of the chan is attached to the valve 46, This valve has a 55 nels 25 so as to close said channels. The barrel tapering portion 41 shaped to land on, ‘and to 28‘may be pulled on out of the‘well with the close, the seat M and beneath said tapering por entrapped sample therein. The valve 46 of course ' tion is ‘reduced to enter the sleeve valve 9 and is will also be pulled out with the sample receiving ‘ ‘provided with the external seal rings 48, 49 coun barrel. tersunk therein to form seals withthe walls of the 60 As the barrel 28 is moved upwardly and before ., valve 9. The tie member 45 is of such length the valve 46 has been lifted off of its seat a partial that the valve 46 will land on and closethe seat vacuum will be created within the coupling 2 l4 approximately at the same time the seal ring and the packer 5 will then collapse the ?uid . 33 enters the upper end of the cylinder 32 and ?owing back into said coupling through the port 65 l4; but in manipulating the tool it may sometimes before the valve 36 lands on the seat 24. When a sample is to be taken the drill stem may be lowered into the well-to a selected loca happen that the sample receiving chamber 21 will be suddenly elevated and the valve 46 suddenly tion with the packer 5 opposite the stratum to be lifted oil of its seat permitting‘the sleeve valve tested. The drill stem at this time will be ?lled 9 to close the port l3 before the packer has had with drilling ?uid. The barrel 28 may then be 70 time 'to collapse. To guard against this contin dropped, or lowered by the line 3|, down through gency a channel 54 has been provided which leads the drill stem with the valve 46 attached. The from within the packer and discharges, into the tapering portion 41 of the valve 46 will land on passageway through the coupling‘ 2 and is con the seat l4 and close the sleeve valve 9. .At or trolled by a back pressure valve 55 which is nor about the same time the seal ring 33 enters the mally held closed by the spring 56, Should the 2,404,825 5 port I3 be prematurely closed, therefore, the ?uid within the packer 5 and between it and the re duced end of the coupling may escape through the channel 54. If desired, more than one of these channels 54 may be provided. . A choke of some kind at the lower end of the drill stem is necessary as otherwise the velocity of the ?uid through the drill stem might move the valve 9 downwardly and open the port 13 and permit premature expansion of the packer before the sample receiving chamber 21 and valve 6 wall thereof, sleeve valves normally closing said openings, an expansible packer around the string enclosing the lower opening and having an in?ow channel leading inwardly therethrough and which continues on to the upper opening, a sample receiving chamber adapted to be lowered through the string and having lower and upper means thereon to land on the lower and upper valves ' in succession to entrap liquid between said valves and move said valves to open position to permit the liquid entrapped between the upper and lower 46 are dropped into place. means to pass into the packer to expand the same The head 29 of the sample receiving chamber against the walls of the well to form a sealed off 21 is provided with a valve assembly 51 screwed area of the wall stratum and to permit the in?ow through the wall thereof and having a tapped 15 of a ?uid sample from said stratum through said hole 58 into which a gauge may be screwed for channel and means for communicating said chan testing the pressure of the sample in the barrel nel with the chamber to allow the entrance of the sample into the chamber. 28 or into which a tubular nipple may be screwed for permitting the discharge of said sample. 3. A well tester having means for connecting This valve assembly 51 contains an inwardly open 20 the same to a tubular string of pipewhereby the ing valve 59 which is normally held closed by tester may be lowered into a well said tester in said pressure but which will automatically open cluding a tubular member having an upper and ' when the gauge or discharge nipple is screwed a lower opening through the wall thereof, sleeve valves normally closing said openings and movable thereby, of the entrapped sample. While going 25 to open positions, an expansible packer enclosing the lower opening and having an in?ow channel into the well and while making the test the tapped into the tapped hole 58 so as to permit the escape, leading inwardly therethrough and which con prevent drilling ?uid from entering the sample tinues on to the upper opening, a sample receiving chamber. When the tester is withdrawn the chamber adapted to be lowered into the well and plug may be removed for allowing the withdrawal 30 having lower and upper means thereon to land of the sample. on the lower and upper sleeve valves in succession to close the passageways through said valves to With the use of the present invention drilling hole 58 is closed by a plug screwed therein to \ of the well bore may progress in the usual man ner and as drilling progresses a test of the forma tion may be made at any time desired; also as many tests of the formation as desired may be made without withdrawing the drill stem. The drawings and description are illustrative entrap‘ liquid in the tubular :‘nem ber between said valves and to move said valves to open position to open said upper and lower openings and to thereby permit the liquid entrapped between the upper and lower means to pass into the packer toexpand the same against the walls of‘ the well merely while it is to be understood that mechani to form a sealed o? area of the wall stratum and cal changes may be made without departing from 40 to permit the in?ow of ?uid from said stratum through said channel and means for communi the principle of the invention as de?ned by the appended claims. cating said channel with the chamber to allow What we claim is: the entrance of the ?uid into the chamber. 1 4. Apparatus for obtaining samples of the ?uid content of earth formations traversed by a bore hole, comprising a support adapted to be lowered separate openings through the wall thereof, sleeve into a bore hole, an enclosure of ?exible material valves normally closing said openings, an expansi on the support, means for in?ating and expand ble packer around the string enclosing one of ing said enclosure to pack oif the bore hole, test said openings and having an inflow channel ex tending through the wall of the packer and open 60 ?uid inlet means in the wall of said enclosure, means for containing the sample obtained, and ing outwardly of the packer at one end thereof means providing communication between said ‘ and which continues on to and communicates inlet means and sample containing means. with the other opening at its other end, a sample 5. Apparatus for obtaining samples of the ?uid receiver adapted to be lowered through the string and having a sample receiving chamber therein 55 content of earth formations traversed by a bore hole, comprising a casing adapted to be lowered and also having means to seat in the valves and into a bore hole, a sleeve of ?exible material on close the central bores thereof, in succession to the casing and secured thereto at the ends there entrap liquid therebetween, and movable, to move of, means for introducing ?uid under pressure said valves to open position to permit the liquid entrapped between the valve moving means to 60 into said sleeve to expand it into packing posi pass into the packer to expand the same against tion in the bore hole, ?uid inlet means in said the walls of the well to form a sealed off area of sleeve and intermediate the ends thereof, sample containing means in the casing, a conduit com the wall stratum and to permit the in?ow of a municating with said ?uid inlet means and sam ?uid sample through said channel and means for communicating said channel with the cham 65 ple containing means, and valve means in the casing for controlling communication between ber to allow the entrance of the sample into the said ?uid inlet means and sample containing chamber. 2. A well tester comprising a tubular string of means. pipe adapted to be lowered into a well and hav LUTHER E. BROWN. 1. A well tester comprising a tubularstring of pipe adapted to be lowered into a well and having ing an upper and a lower opening through the OLLIN W. WIILIAMB.