Repeated seat seal type packing water regulator

Abstract

The invention discloses a repeated seat seal type packing water regulator, and relates to a packing and water regulating tool for separate layer water injection of an oilfield water injection well. The repeatable seat seal type packing water regulator is integrated with an eccentric water regulator and a repeatedly-set hydraulic packer, has the function of an underground repeated seat seal of the packer and the functions of two eccentric water regulators, and simultaneously solves the problems of choke damage. The repeated seat seal type packing water regulator fits for the requirements of a layered water flood well with the wellhead pressure approaching that of a trunk line and with large interbed physical difference, fits for subdivision water injection of a plurality of thin interbeds, and improves the testing accuracy and the allocation efficiency of each single bed as well as the running and pulling efficiency of water nozzles; and the repeated seat seal type packing water regulator has the advantages of the existing eccentric separate layer injection technology without changing the existing running an pulling and separate layer testing modes and solves the technical problems that the hydraulic eccentric packing water regulator can not be subjected to seat seal after downhole unsealing due to creeping of a separate layer injection tubing string or other reasons, and the validity period of the separate layer injection is prolonged.

Description

technical field [0001] The invention relates to an isolation and water distribution tool for layered water injection in an oilfield water injection well. Background technique [0002] The current technology is a multifunctional eccentric water distribution packer (ZL2010206234.6), which utilizes the working characteristics of the expansion packer to realize repeated downhole sealing. The mouth loss of the layer water nozzle is greater than 0.8 MPa, and the pressure of the pump station (trunk line) is required to be greater than the injection pressure of the wellhead of the water injection well by 2 MPa; it cannot adapt to the high wellhead pressure of the injection well in the oil field (or close to the main line pressure) and the large difference in physical properties between layers. Well injection needs. [0003] From the analysis of the working characteristics of the packing water distribution device, such as an eccentric water distribution packer (Patent No. ZL 2007200...

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the technical problem that the hydraulic packer can no longer be set when it is unsealed due to the peristalsis of the pipe string or other reasons in the downhole, and proposes a repeatable sealing water distribution device

[0007] The present invention integrates an eccentric water distributor and a hydraulic packer with repeated sealing, and has the functions of the packer repeatedly setting and sealing downhole and two eccentric water distributors, and solves the problem of mouth damage at the same time. The wellhead pressure of the separate injection well is close to the main line pressure and the requirements of the separate injection well with large differences in physical properties between layers can adapt to the subdivision of water injection in multiple thin interlayers, improve the test accuracy and deployment efficiency of each single layer, and improve the fishing efficiency of the water nozzle; the present invention Without changing the existing fishing and layered testing methods, taking into account the advantages of the existing eccentric separate injection process, it solves the problem of creep of the injection string or other reasons that cause the hydraulic eccentric isolation water distributor to be unseated after it is unsealed downhole technical difficulties, prolonging the validity period of dispensing

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