Tail pipe completion method by plugging expandable casing on top of screen pipe

Abstract

The invention discloses a tail pipe completion method by plugging an expandable casing on the top of a screen pipe. The scheme includes that after a starting device 6 in a completion string trips into the bottom of an underground intermediate casing 4, a base pipe 9 from a well head drives the starting device 6 to ascend along the expandable casing 1 to be expanded, so that the expandable casing 1 radially, permanently and plastically deforms, and multiple sections of rubber rings 5 on the expandable casing 1 are vulcanized and are compressed in an annulus between the outside of the expandable casing 1 and the intermediate casing 4. The tail pipe completion method has the advantages that the inner diameter of the tie-back casing can be increased after the expandable casing is expanded, later-stage oil recovery and operation are facilitated, and the rubber rings on the expandable casing plug complicated layers and prevent channeling of the head of a tail pipe.

Description

technical field [0001] The invention relates to a liner completion method plugged by an expansion casing at the top of a screen pipe, and relates to the technical field of petroleum drilling and well completion. technical background [0002] Well completion engineering is a relatively independent project connecting drilling and oil production engineering. Optimizing and improving well completion technology and developing and researching new completion technologies are of great significance to improving the exploration and development effects of oil and gas reservoirs. With the rapid development of society and economy, the demand for crude oil is increasing day by day, the drilling technologies such as deep wells, ultra-deep wells, highly deviated wells, horizontal wells, branch wells, small wells and small gap wells are constantly emerging, and the sidetracking technology of old wells is rapidly increasing. The quality of well completion is directly related to the production...

AI Technical Summary

Problems solved by technology

However, the cementing completion process at the top of the screen usually uses special completion tools such as external packers, grading hoops, blind pipes, and liner hangers to cooperate with the lower screen. The supporting tools are complicated, and their performance and quality are superior. Inferiority directly affects the smooth progress of the liner completion and the success of the construction. Any problem in any link will affect the completion quality

The existing liner hanger and external packer, due to the constraints of their own structure, the diameter is limited, which has many adverse effects on the later operation of the liner, and it is difficult to complete the liner in some wells to be completed Meet the current production needs, and sometimes even cause major downhole accidents

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