Патент USA US2132723код для вставки
Oct. 11, 1938. c. s CRICKMER ET AL . ‘ PACKING ELEMENT 23132723 ‘ ‘ Filed Nov. 5, 1936 .w/él I _ /6 § 24 I % //4 // /9 ' /7 i /7 /4 ' Patented Oct. 11, 1938 2,132,723 ’ UNITED STATES PATENT OFFICE 2,132,723 PACKING ELEMENT Charles s. Crickmer and at, A. Lamb, Dallas, Tex, assignors to Mei-la Tool Company, Dallas, Application November 5, 1936, Serial No. 109,264 1 Claim. (01. use-10y~ This invention relates to new and useful im provements in packing elements. ' One object of the invention is to provide an improved packing element particularly adapted for use on a well packer, or other device, and arranged to effectively seal off the annular space between the well casing and tubing. Figure 2 is a transverse, vertical, sectional view of the element in its distorted position, Figure 3 is a horizontal, cross-sectional view taken on the line 3--3 of Figure 1, and Figure 4 is a view, partly in section and partly 5 in elevation, of a modi?ed form of the invention. such manner as to produce the sealing effect of a In the drawing, the numeral l0 designates an elongate tubular mandrel which is adapted to be connected in a tubing string or other support (not shown), so as to be lowered therewith into a well 10 casing A. The invention is applicable to any de plurality of superimposed packing rings, where vice, but for purposes of description it is shown An important object of the invention is to pro vide an improved elongate packing element which 1-0 is arranged to be distorted into sealing position in by the increased e?iciency of a series of packing as mounted on the mandrel of a well packer. rings is obtained, while the strength and dura The usual slip head II is slidable on the mandrel, 15 bility of a one piece packing member is retained. and the usual gripping slips (not shown) are A further object of the invention is to provide slidable on this head. When the slips are en an improved elastic packing element which is pro » gaged with the wall of the casing, the head II vided with a plurality of reinforcing members is held stationary and the mandrel may slide molded, or otherwise secured therein, at spaced therethrough. The slips have not been shown, as :0 points throughout the length of the element, they form no part of the invention, and any suitwhereby when the element is distorted, the rings able means may be employed for locking the head act to displace the outer periphery of the ele in a ?xed position in the casing. ment into a series of superimposed bulges or pro A supporting thlmble I2 is slidably mounted ‘tuberances, whereby the packing effect of a plu on the mandrel l0 above the slip head II, and rality of superimposed individual packing mem rests upon the upper end thereof. The thimble bers is obtained. i is recessed at its upper end to form a peripheral Still another object of the invention is to pro ?ange l3. An elastic packing element I4, formed vide an improved elastic packing element having of rubber, Duprene, or any other suitable elastic means for anchoring the inner periphery thereof material, surrounds the mandrel above the thim 30 to a support, whereby when the element is dis ble 1! and has its reduced lower end disposed torted, its outer periphery will be displaced out within the recess in the thimble and con?ned be wardly into sealing position without disengaging tween the ?ange l3 and the mandrel. A ?anged the element from its support; said means also con?ning cap or inverted thimble l5 engages the acting to' prevent distortion of the element beyond reduced upper end of the packing element, where 35 its elastic limit. . by the element is mounted on the mandrel beA further object of the invention is to provide tween the cap l5 and the thimble l2. A retain an improved packing element having reinforcing ing collar “5 is secured to the'mandrel above the members mounted therein in spaced relation throughout the length of the element, and suitable 40 fabric or other ?exible sleeves disposed on the inner periphery of the element between the re inforcing member, said sleeves acting as a binder to prevent undue splitting and cracking of the con?ning cap IS in some suitable manner, as by screw threads, whereby said cap is held in con packing element. . ., A construction designed tocarry out the inven tion will be hereinafter described, together with other features of the invention. The invention will be more readily understood from a reading of the following specification and 50 by reference to the accompanying drawing, in which an example of the invention is shown, and wherein: Figure 1 is a view, partly in elevation and partly in section, of a packing element constructed in 55 accordance with the invention, 15 20 25 ‘ 30 35 stant engagement with the upper end of the 'pack- 40 ing element. A plurality of spaced metallic reinforcing rings I‘! are molded, or otherwise suitably mounted, within the packing element, being disposed in a horizontal plane. Each ring encircles the man- 45 drel and has its inner periphery engaging the mandrel, while its outer periphery terminates short of the outer periphery of the packing ele ment. Each ring is ?at and has a plurality of perforations I 8 extending entirely therethrough, 50 and it is obvious that the material of which the packing element is constructed passes through these openings, whereby the ring is rigidly af fixed within the element. ‘ Since the rings encircle the mandrel I II it will be seen that they tend to 55 2,132,723 - 2 hold the packing element in engagement with the mandrel. _ When the device has been lowered into posi tion within the well casing, with the packing 'ele ment in its normal or undistorted position; as shown in Figure 1, the slips (not shown) are moved into gripping engagement with the wall of the casing, thereby holding the slip head ll stationary. Since the thimble I2 is supported 10 on the slip head, it will also remain stationary, while the mandrel In, which is slidable through the elastic limit of its material is substantially eliminated by the spaced rings, which retain those portions of the element secured thereto in a ?xed position with relation to the mandrel. A modi?ed form of the. invention is shown in Figure 4, wherein all the features of the packing element hereinbefore described are retained, and in addition ?exible reinforcing sleeves 20, made of fabric or other suitable material, are suitably secured to the element. The sleeves may be vul 10 canized or otherwise fastened on the inner pe both the thimble l2 and the slip head H, may riphery of the packing element between the rings move vertically. As the mandrel is moved down I'I. Said sleeves encircle the mandrel in inti mate contact therewith and serve to further anchor the packing element to the mandrel, and 15 thereby aid in preventing said element from being stripped off the mandrel. However, in stead of a plurality of sleeves, a single elongate sleeve extending throughout the bore of the packing element may be provided. The sleeves 20 not only tend to hold the element more ?rmly on the mandrel, but also prevent disintegration of said element in the event that the element wardly, theretaining collar I6, being ?xed to the 15 mandrel, moves downwardly therewith and also moves the con?ning cap-l5 downwardly. The downward movement of the cap l5 toward the stationary thimble l2 distorts the packing element [4 therebetw'een, and since the metallic 20 rings l1, molded within the element, are com pressed therewith into closer proximity to each other, the element is distorted between each pair of rings into annular protuberances or bulges I9 (Figure 2). That portion of the ele 25 ment in the plane of each ring will be held in substantially its normal undistorted positionby the ring because it is ?rmly ai't?xed or molded to the ring. The distortion of the packing member cracks or splits. It is noted that in either form, when the pres 25 sure exerted on the element is removed, said element will return to its normal undistorted position due to the inherent elasticity oir its ma distortion of the element have substantially the terial. It is further noted that any suitable means for supporting and distorting the element 30 may be used, as said means forms no part of the invention. What we claim and desire to secure by Letters same sealing effect as a series of superimposed Patent, is: causes the same to move into engagement with 30 the wall of the well casing, whereby a seal is formed between said casing and the mandrel. It is noted that the protuberances formed by 35 individual packing rings, yet _the element is formed in a- single piece and retains the strength and durability of a one piece packing element. It is further noted that, since the packing ele ment is ?rmly a?ixed to the metallic rings l1, 40 and extends through the openings l'8 therein, said rings act to hold the element in engagement with the mandrel, whereby said element is pre vented from being stripped o? the mandrel. It is also noted that the provision of the spaced 45 rings I'I within the element serves to reinforce the same throughout the length thereof, where by the element is strengthened and made more rigid. Also, distortion of the element beyond - A packing element including, an elongate an 35 nular body of elastic material having a plurality of equally spaced ?at rigid metallic rings em bedded therein throughout the length thereof and a sleeve of ?exible reinforcing material lin ing its bore, the inner peripheries of said rings coinciding substantially with the periphery of the bore of said elastic body and the outer pe ripheries of the rings terminating short of the circumference of the body, whereby a continu ous solid and» unreinforced annular strip of the , elastic body material is located outside the outer peripheries of the rings. CHARLES S. CRICKMER. ROY A. LAMB.