Bridge plug delivery device, cementing plug string and cementing plug process
A bridge plug and injection pipe technology, which is applied in the field of downhole tools in oil and gas fields, can solve the problem that the bridge plug cannot be seated, and achieve the effect of being difficult to disengage.
Active Publication Date: 2021-01-05
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
[0006] The purpose of the present invention is to provide a bridge plug delivery device to solve the technical problem that the bridge plug delivery device in the prior art tends to cause the shear nails corresponding to the ball seat to be cut off in advance when the bridge plug delivery device is lowered, resulting in the failure of the bridge plug to be seated; Also provided is a cementing plug string using the bridge plug feeder to achieve reliable seating of the bridge plug; and also provides a process for cementing plug operations using the cementing plug string to realize bridge plug seating Seal and feeder normal injection cement plug
Method used
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[0061]The embodiments of the present invention will be further described below in conjunction with the drawings.
[0062]Specific embodiments of the cement plug pipe string of the present invention, such asFigure 1 to Figure 10 As shown, the cement injection plug pipe string includes a bridge plug ejector 300 and a bridge plug 400. The bridge plug ejector 300 and the bridge plug 400 are connected by shear nails. The bridge plug ejector 300 is connected to the oil pipe 100, and the bridge plug delivers The device 300 can send the bridge plug 400 to the set position in the well and seal the bridge plug seat in the casing 200. After the bridge plug 400 is sealed, the shear nails can be cut to cut the bridge, and the bridge plug 400 can be left in the well and pass the bridge plug 400 The high pressure layer 500 is sealed, the bridge plug feeder 300 is lifted up, and the cement plug is injected through the bridge plug feeder 300.
[0063]Such asfigure 2 withimage 3 As shown, the structure of ...
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The invention relates to the technical field of downhole tools of an oil and gas field, in particular to a bridge plug delivery device, a cementing plug string and a cementing plug process. The bridgeplug delivery device comprises a central pipe, a hydraulic setting mechanism and a pressure transmission hole formed in the central pipe, wherein an injection hole is formed in the pipe wall of an injection pipe; a ball seat is in threaded connection or welded or integrally formed at the lower end of the injection pipe; injection pipe grooves are formed in the peripheral surface of the injectionpipe; a central pipe through hole is correspondingly formed in the central pipe in the radial direction; the bridge plug delivery device comprises an injection pipe locking block; the injection pipe locking block penetrates through the central pipe through hole from outside to inside and penetrates into the injection pipe groove so as to vertically lock the injection pipe and the central pipe; theinjection pipe groove is in inclined plane fit with the inner end of the injection pipe locking block, so that the injection pipe locking block is ejected outwards out of the injection pipe groove inthe radial direction when the injection pipe moves downwards relative to the central pipe; a stopping inner wall surface is arranged in the position, corresponding to the injection pipe locking block, of a sleeve body; and an avoiding section is arranged in the position, next to the upper end of the stopping inner wall surface, of the sleeve body.
Description
Technical field[0001]The invention relates to the technical field of oil and gas field downhole tools, in particular to a bridge plug injector, a cement plug pipe string and a cement plug process.Background technique[0002]Cement plug is a conventional technology used to seal the lower oil, gas and water layers. It has the advantages of simple and convenient operation, adjustable slug length, and permanent high pressure resistance. It mainly adopts cement injection with a smooth tubing or tubing end connected to a pen tip tool. The plug pipe string completes the process measures, but the above pipe string cannot be directly used to plug the high pressure layer to complete the high pressure cement plug process. At present, to seal the high pressure layer, it is necessary to first run the bridge plug to deliver the pipe string. After the high pressure layer is blocked by the delivery, seat sealing, and discarding of the bridge plug, the cement plug pipe string is run again to complete ...
Claims
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IPC IPC(8): E21B33/134E21B33/16
CPCE21B33/134E21B33/16
Inventor 曹海燕赵继李世民黎文才王木乐董建伟刘国梁万龙
Owner CHINA PETROLEUM & CHEM CORP