Open hole full-bore infinite stage staged fracturing well completion device and fracturing well completion method thereof

Abstract

The invention discloses an open hole full-bore infinite stage staged fracturing well completion device and a fracturing well completion method thereof. The open hole full-bore infinite stage staged fracturing well completion device and the fracturing well completion method are suitable for fracturing well completion processes of horizontal wells and vertical wells. The device comprises a casing string, a top suspension packer, open hole fracturing packers, fracturing well completion sliding sleeves, a differential pressure type fracturing well completion sliding sleeve, a shaft isolating valve and a bottom circulating valve, and the open hole fracturing packers and the fracturing well completion sliding sleeves are connected to the casing string in a matched mode to form the open hole full-bore infinite-stage staged fracturing well completion device. The fracturing well completion sliding sleeve is of a full-bore design, and the opening tool and the fracturing well completion sliding sleeve are matched one by one to complete the sliding sleeve opening action. The staged fracturing stage number is not limited; the one-key one-opening of the fracturing well completion sliding sleeve at any fixed point can be realized, the one-key multi-opening of the one-stage multi-cluster fracturing well completion sliding sleeve can also be realized, the full bore of a well completion pipe string is realized after fracturing, the continuous, rapid, large-scale, multi-stage and multi-cluster fracturing construction requirements are met, and the fracturing efficiency is improved.

Description

technical field [0001] The invention relates to a fracturing completion device for oil and water wells in the petroleum industry, in particular to an open-hole full-diameter infinite-stage fracturing completion device and a fracturing completion method thereof. Background technique [0002] At present, the fracturing and completion technologies used in low-permeability and tight oil reservoirs at home and abroad are mainly divided into two categories: open-hole multi-stage fracturing completion technology and casing cementing multi-stage fracturing completion technology. Its mainstream technology covers ball-sliding sleeve multi-stage fracturing completion, pumping bridge plug multi-stage fracturing completion, etc. [0003] Among them, the ball-sliding sleeve type multi-stage staged fracturing completion technology, whether it is applied in open-hole fracturing completion or casing cementing fracturing completion, is a combination of balls and ball seats with different stag...

AI Technical Summary

Problems solved by technology

For example, the Chinese patent CN103556971B "full-diameter layered fracturing sleeve for oil and gas well operations" authorized on March 2, 2016 discloses a new type of ball-pitching sleeve that includes a step-type moving mechanism. The technology can realize the function of opening the sliding sleeve step by step by throwing balls of the same size in sequence. In principle, it can realize unlimited stages and maintain the full diameter of all sliding sleeves. The fracturing section is lost due to normal start-up; in addition, since the structure does not involve a sealing mechanism, the fracturing construction is prone to leakage from top to bottom; the starting ball in the later stage of the process still needs to be returned and discharged, and the process is complicated

[0005] In addition, the Chinese patent application CN110905448A "An infinitely graded full-bore fracturing sliding sleeve assembly system" published on March 24, 2020, discloses a series connection through pipelines and one-to-one correspondence with multiple opening mechanisms. The fracturing system of multiple sub-fracturing sliding sleeves can realize that after the fracturing of all intervals is completed, the entire pipe string can be full-diameter without drilling, which is beneficial to later production management. Multi-stage sliding sleeves can be connected in series. Infinite stages are realized, but the positioning elastic part of the opening mechanism in this fracturing sleeve system is prone to plastic deformation in the process of multi-stage fracturing sleeves, resulting in opening failure and loss of fracturing intervals; at the same time, the positioning groove is the upper joint The annular gap between the inner sleeve and the inner sleeve, the selective switch cannot be performed later

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