Blasting type fracturing control valve

Abstract

The invention provides a blasting type fracturing control valve which is suitable for multi-stage staged fracturing completion engineering of development of unconventional resources such as low permeability reservoirs and shale oil and gas. The control valve comprises a sliding sleeve which is arranged between a central pipe and a fracturing shell and fixed with the fracturing shell through a shear pin, the two ends of the central pipe and the two ends of the fracturing shell are connected with an upper connector and a connecting sleeve respectively, and the lower portion of the connecting sleeve is sequentially connected with a bomb carrying shell, a detonating shell and a lower connecter; the central pipe is provided with a sand outlet and a blasting valve, blast bombs are contained in the bomb carrying shell, a detonating assembly is contained in the detonating shell, a liquid inlet is formed in the inner wall of the detonating shell, and the detonating assembly is connected with the blast bombs. According to the control valve, the completion construction cycle can be shortened, the construction operation cost and operation risks can be effectively reduced, and the production targets of efficient and economical utilization and large-scale development and application of the low permeability reservoirs and shale oil and gas reservoirs can be achieved.

Description

technical field [0001] The invention relates to downhole fracturing construction tools for horizontal wells in the petroleum industry, in particular to a blasting fracturing control valve, which is a matching tool for multi-stage and segmented fracturing completion pipe strings in horizontal wells, and is suitable for low-permeability reservoirs and oil reservoirs. Multi-stage staged fracturing completion projects for the development of unconventional resources such as rock oil and gas. Background technique [0002] At present, my country's low-permeability oil reservoir reserves and shale oil and gas resources are abundant, but it is difficult to develop due to low production capacity and poor production efficiency. How to efficiently and economically produce low-permeability reservoirs and unconventional resources such as shale oil and gas has been a long-term exploration problem. Horizontal well staged fracturing technology is the key technology to solve this problem. ...

AI Technical Summary

Problems solved by technology

However, during construction, the construction displacement is small before the stratum is pressed out based on safety considerations. When the differential pressure sliding sleeve fracturing valve is opened, the starting shear nails are cut off, and the pressure drops rapidly. At this time, the differential pressure sliding sleeve fracturing valve is unable to The phenomenon of full opening causes the differential pressure sliding sleeve fracturing valve to be in a half-open state during fracturing, and there is a large throttling pressure difference in the fracturing channel, which will not only cause damage to the sandblasting port of the differential pressure sliding sleeve fracturing valve, The construction pressure is too high due to the throttling pressure difference; secondly, if the design and selection of the pressure difference sliding sleeve fracturing valve are unreasonable, or the assembly and construction operations are improper, the pressure difference sliding sleeve fracturing valve will not work normally. The risk of opening will cause normal fracturing, and it will be necessary to install perforating guns and other tools for remedial measures in the later stage, resulting in long construction period and high cost.

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