Staged fracturing well completion method using hydraulic-controlled switch to open/close controllable valves

Abstract

The invention relates to a staged fracturing well completion method using a hydraulic-controlled switch to open / close controllable valves, is used for staged fracturing well completion of sleeves in petroleum horizontal wells or vertical wells, and can meet the development demands of low-permeability reservoir and unconventional oil gas resources. The method comprises: arranging openable / closable control valves the number of which is corresponding to the layer stages required to be staged-fractured in a well in a fracturing well completion tubular pile, and installing the control valves in the well; connecting a set of hydraulic-controlled switch tool to the bottom by using a connecting oil pipe to obtain an operation tubular pile, and installing in the fracturing well completion tubular pile; and carrying out hydraulic control on the operation tubular pile, and opening / closing the selected openable / closable control valves in the fracturing well completion tubular pile by using the hydraulic-controlled switch so as to finish staged fracturing well completion construction of the sleeves in the well stage. The staged fracturing well completion method has the advantages that: controllable valves with maximum latus rectum can be used according to the specific condition of the well completion tubular pile; a set of hydraulic-controlled switch can realize opening / closing of multiple controllable valves; the fracturing stage number is not limited; sleeve sand fracturing well completion can be adopted in stratum; and the demands of large output and large-scale fracturing transformation can be met.

Description

technical field [0001] The invention belongs to the process technology of staged fracturing completion in the petroleum industry, in particular to a staged fracturing completion method using a hydraulically controlled switch to open and close a controllable valve, which is used for casing staged fracturing completion in horizontal wells or vertical wells. wells to meet the development needs of low-permeability reservoirs and unconventional oil and gas resources. Background technique [0002] At present, the use of horizontal well staged fracturing technology to improve the development and application scale of unconventional resources such as low permeability reservoirs and shale oil and gas is gradually increasing. However, the currently commonly used horizontal well open hole packer staged completion technology, such as: the application number 200920248979.9 of the horizontal well completion and fracturing integrated pipe string, the sliding sleeve staged fracturing technol...

AI Technical Summary

Problems solved by technology

However, the currently commonly used horizontal well open hole packer staged completion technology, such as: the application number 200920248979.9 of the horizontal well completion and fracturing integrated pipe string, the sliding sleeve staged fracturing technology is opened step by step by throwing balls, in order to allow input The inner diameter of the ball seat at the bottom must be smaller than the inner diameter of the ball seat at the upper level. Affected by the hierarchical arrangement of ball seat sizes, the number of stages and the scale of fracturing are different. It is greatly restricted, which affects the transformation effect; and the sliding sleeve is a ball-pitching sliding sleeve, the sliding sleeve is opened after the ball is thrown in, and it cannot be closed in later production

If selective production or repeated fracturing is to be carried out in the later stage, the sliding sleeve needs to be closed, and the integrated pipe string will not be used as a whole, and the tubing fracturing string can only be rerun into the pipe string for small Large-scale in-pipe staged fracturing, so it cannot meet the use requirements in the follow-up construction after well completion

At the same time, the structure of the utility model integrated well completion and fracturing string is relatively complex, and it is prone to operational failures.

In the development of low-permeability reservoirs and unconventional oil and gas resources, for vertical wells with multi-stage fracturing, especially horizontal wells with complex string structures and high technical requirements, there is no casing fracturing completion method that can solve the above problems. problem

How to improve the structure of the sliding sleeve in the fracturing completion string, that is, the structure of the control valve, how to open and close the sliding sleeve or control valve, so that the opening and closing of the sliding sleeve can be controlled and become a switchable control valve has always been a technical issue. The above-mentioned problems have not been solved, which restricts the development of low-permeability reservoirs and unconventional oil and gas resources

Images