A shale gas bridge plug completion method in stages

Abstract

The invention provides a shale gas bridge plug subsection completion method and belongs to the field of unconventional oil-gas reservoir well completion projects. The shale gas bridge plug subsection completion method comprises firstly using a hydraulic pump to transmit a widowmaker and a drilling removing type bridge plug to an objective layer section in a gas well through a hydraulic pump to conduct perforation, fracture and seat sealing interaction, then conducting the perforation, the fracture and the seat sealing interaction on a next objective layer section and achieving well completion of each objective layer section; and finally drilling a multistage bridge plug through a drilling and milling tool through a continuous oil tube, building production layer channels and conducting well completion operation. The shale gas bridge plug subsection completion method meets requirements for shale gas development well-case perforation completion, provides a solid well wall and a channel for communicating production layers for later stage construction, meets well completion requirements for multistage segmentation of a shale gas horizontal development well, can achieve sealing and separation of a lower bridge plug, perforation and fracture process seat interaction, simplifies well completion procedures, saves construction time, can drill the multistage bridge plug at one time in the drilling removing type bridge plug, and effectively shortens well completion periods.

Description

technical field [0001] The invention belongs to the field of well completion engineering of unconventional oil and gas reservoirs, and in particular relates to a shale gas bridge plug well completion method in stages. Background technique [0002] With the rapid development of the world economy and the rising demand for oil and gas, shale gas, as an unconventional oil and gas resource, has been continuously discovered and proven, and its economic value and strategic significance have been increasingly valued by various countries. At present, the total amount of shale gas in the world is 456×10 12 m 3 , China is very rich in mud shale, with reserves of about 456×10 12 m 3 As an important part of China's oil and gas resources development strategy, shale gas drilling and development have been gradually started, and it will be of great significance to study its supporting technology. Due to the poor physical properties and low porosity and low permeability of shale gas reser...

AI Technical Summary

Problems solved by technology

[0006] (1) Casing, cementing, and multi-stage separation of fracturing stages with combined plugs; this method is complex and the number of stages is limited (only 2-6 stages)

[0007] (2) Use flexible tubing or buckle-connected tubing to supply water or sandblast the perforated pay zone at each stage; the process is complicated, with long construction period and high cost

In the existing technology, it is necessary to use tubing to run conventional tools to realize perforation, isolation and fracturing step by step, which not only prolongs the construction period, but also limits the channels for later fracturing and production, and at the same time, it is impossible to realize multi-stage and staged well completion

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