Full-bore well completion fracturing method for low-permeability reservoir sidetracking well

Abstract

The invention provides a full-bore well completion fracturing method for a low-permeability reservoir sidetracking well. The method comprises the following steps: step 001, determining a target well,and opening a window in the target well to sidetrack a new borehole; step 002, assembling a well completion pipe string; step 003, lowering the well completion pipe string into the target well, and conducting setting; step 004, carrying out well cementation operation on the new borehole; step 005, pulling out the upper half portion of the well completion pipe string to be replaced with a fracturing tie-back pipe string; step 006, implementing perforating fracturing on the reservoir where the new borehole is located by a perforating gun; and step 007, pulling out the fracturing tie-back pipe string, and putting down a production pipe string to be put into production. According to the method provided by the invention, a brand-new wellbore can be built in the sidetracked slim hole of the low-permeability oil field, reservoir staged fracturing transformation or later repeated fracturing operation can be smoothly carried out, an old casing in an old wellbore is protected in the fracturing process, and the purposes of reducing the construction cost and increasing the final recovery ratio of an oil reservoir are achieved.

Description

technical field [0001] The invention belongs to the field of oil production engineering, and in particular relates to a full-diameter well completion and fracturing method for sidetracking wells in low-permeability oil reservoirs. Background technique [0002] After the development of water flooding in ultra-low permeability reservoirs, the water well row forms a waterline, and the remaining oil on the side of the waterline cannot be effectively produced, and strong water-washing sections and weak water-washing sections coexist alternately in the vertical layer. The method of re-perforating and fracturing the oil well to tap the potential after sidetracking through the window, but there are the following problems: [0003] First, the production time of the old casing is long, and there are problems that the old casing cannot be protected and the oil layer section cannot be fully reformed when the bare casing combined layer (stage) fracturing method is used; [0004] The sec...

AI Technical Summary

Problems solved by technology

[0003] First, the production time of the old casing is long, and there are problems that the old casing cannot be protected and the oil layer section cannot be fully reformed when the bare casing combined layer (stage) fracturing method is used;

[0004] Second, the sealing fracturing process is carried out by lowering the tubing string, and the staged fracturing reconstruction has low construction efficiency and the risk of pipe sticking, which affects the large-scale promotion and application of the technology of sidetracking to tap the remaining oil in low-permeability reservoirs

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