Drilling-free cement injecting device for horizontal well

Abstract

Provided is a drilling-free cement injecting device for a horizontal well. Connection is carried out procedure by procedure according to the well cementing procedures. In the well wall washing process, a lengthened two-stage parallel setting casing pipe outer packer is connected with an inner-pipe-free and drilling-out-free device and is further connected with a well cementing pipe column to be lowered to the well bottom. In the cement injecting and well cementing processes, a first-stage opening and closing sliding sleeve rubber plug is connected with the inner-pipe-free and drilling-out-free device in a casting mode and is connected with a packer opening and closing sliding sleeve in a colliding mode under the pumping pressure, the packer opening and closing sliding sleeve descends to open a packer communication channel and seal the lengthened two-stage parallel setting casing pipe outer packer in an expanding mode, pressure shutting-in continues, and the packer opening and closing sliding sleeve descends to push a cement grey injecting hole opening and closing sliding sleeve to descend to open a cement grey injecting hole and carry out cement injecting. In the well cementing, pressure shutting-in and cementing waiting processes, a second-stage displacing colliding press rubber plug is connected with the inner-pipe-free and drilling-out-free device in a casting mode, connected with a colliding press sleeve in a colliding mode under the action of displacing liquid and connected with a colliding slip of the first-stage opening and closing sliding sleeve rubber plug. In the drill-down and fishing processes, a self-locking recessing fishing socket is connected with a slip of the second-stage displacing colliding press rubber plug through a fishing pipe column to fish out accessories in the inner-pipe-free and drilling-out-free device at a time.

Description

Technical field [0001] The invention relates to a drilling-free cement injection device for horizontal wells used for well completion, which belongs to the field of oil field technology development. Background technique [0002] At present, in the completion technology of horizontal wells, in order to make the oil layer have a large exposed area, avoid the damage of the cement slurry to the oil layer, and effectively protect the oil and gas layers, the completion method of precision sand filter tube is mostly used. The staged cementing process of screen top cement injection is required. During the implementation of this process, the casing accessories such as drilling rubber plugs and grading hoops are located at the position of the large well deviation angle of the downhole pipe string. When drilling the plugs, there are problems such as unclean cleaning of the accessories in the pipe, wear and tear of the casing or free section tripping, damage to the cement sheath and sub...

AI Technical Summary

Problems solved by technology

The disadvantage of the conventional graded cementing device is that the drilling speed must be strictly controlled when running the casing to prevent the phenomenon of drilling stuttering and slippage. tool structure

During the drilling and grinding process, not only the casing is easily damaged, but also the operation takes a long time

These shortcomings of the conventional graded cementing device restrict its use value, and cannot well meet and meet the requirements of cementing production operations

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