Undersize-hole oil pipe plugging device

Abstract

The invention relates to petroleum machinery, particularly to an oil pipe plugging device for plugging the inner hole of an oil pipe positioned below underground small-hole equipment, which comprises a core bar (1), wherein a clamping claw assembly (4), an upper slip guide taper sleeve (5), a middle connecting sleeve (6), a lower slip guide taper sleeve (7), a lower connecting sleeve (8), a jacket assembly (9) and a plug assembly (10) are sleeved on the core bar (1); and an upper slip assembly (11), an upper pressure spring (12), a lower pressure spring (13) and a lower slip assembly (14) aresleeved on the middle connecting sleeve (6). The oil pipe plugging device can be used for plugging a large-inside-diameter oil pipe positioned below thereof through the small hole of underground pipecolumn tools, such as a water distributor and the like, has the advantages of firm fixation in the oil pipe and high plugging reliability, can also be used for reliably plugging the underground oil pipe to prevent blowout from occurring, and ensures the normal water-well major repair operation, thereby playing roles of environmental protection and safe production, being high in use safety and more convenient to use and more beneficial to the safety of oilfield production.

Description

Technical field [0001] The present invention involves petroleum machinery, which specializes in a oil pipe blocking device in the pipes under the pipes under the small hole equipment under the well. Background technique [0002] When repairing water wells in the implementation of the modern oil recovery project, the water injection pipe column needs to be used together with the water -injection water distribution device to maintain the ground for maintenance and update. During the pipe column being proposed, the high pressure formed by the long -term water injection, that is, the stratigraphy energy formedLosses will cause losses. After the maintenance is completed, it will take at least 60 days of high -intensity water injection to restore the pressure of the stratigraphy to meet the needs of production.At the same time as the loss of strata energy, it has a great impact on the production of the surrounding oil wells, and a large amount of strata water flows out of the ground wi...

AI Technical Summary

Problems solved by technology

[0003] 1. The method of plugging the oil pipe plug, but the outer diameter of the plugging part of the oil pipe plug and the inner diameter of the oil pipe should be interference fit, and the oil pipe plug can only reach The inner diameter of the uppermost stage of the multi-stage water distributor in the pipe string, the middle hole of the water distributor is smaller than the inner hole of the oil pipe, and the plugging device cannot pass through the small hole of the water distributor, that is to say, most of the pipe string below the uppermost water distributor cannot be sealed. Blocking

[0004] 2. Directly lower the tool to block the small hole of the water distributor, but due to the complicated specifications and models of the water distributor, and the long-term corrosion of the sealing part of the underground water distributor, the plugging Ineffective

[0005]Third, there is also a method of placing a tool at the lower part of the pipe string first, and then injecting coagulant into the pipe string, but this method has a long construction period and complicated operations Lock, high cost, poor reliability, not suitable for use

[0006]Due to the high downhole pressure, it is not easy to reliably plug the tubing, and it is even more difficult to solve the plugging of the small hole of the downhole string tool such as the water distributor located below it. The oil pipe with a large inner diameter in the position, the plug is not easy to pass through the small hole and not easy to block the oil pipe, which is still an unsolvable technical problem

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