Ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method

Abstract

The invention discloses an ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method. The ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method comprises the steps that (1) evaluation of key parameters of a shale before fracturing is performed; (2) the hydraulic injection position is determined; (3) fracture parametersare optimized; (4) fracturing construction parameters are optimized; (5) sandblasting perforation fracturing operation is performed through large diameter coiled tubing or 3<1 / 2>in conventional tubing; (6) acid pretreatment operation is performed; (7) low-viscosity slickwater fracturing fracture-forming construction is performed, and low-viscosity slickwater with the viscosity of 1mPa.s-2mPa.s isadopted for communicating and extending more small micro-scale fracture systems; (8) low-viscosity slickwater 70 mesh-140 mesh proppant injection construction is performed; (9) high-viscosity glue solution sand fracturing construction is performed; and (10) displacing operation is performed. The ordinary-pressure shale gas screen pipe completion hydraulic injection volume fracturing method can ensure that multi-cluster volume fracturing construction is performed on an ordinary-pressure shale gas horizontal well, can greatly increase the transforming volume of an ordinary-pressure shale gas fracturing fracture, and improves the development level of ordinary-pressure shale gas. The development of the ordinary-pressure shale gas becomes cost-effective.

Description

technical field [0001] The invention relates to the field of well drilling, and more specifically, relates to a hydraulic jet volume fracturing method for completion of an atmospheric shale gas screen. Background technique [0002] At present, normal-pressure shale gas is usually completed by casing cementing, and the combined fracturing method of bridge plug and perforation is used for staged fracturing. Due to the inherent geological characteristics of atmospheric shale gas, higher requirements are placed on the complexity of fractures and the volume of fracturing stimulation. However, due to the use of casing cementing and completion methods, the direct contact area between the wellbore and shale is greatly reduced , each section has only a limited number of dozens of perforation holes in direct contact with the shale formation, if the complexity of the fractured fractures is not enough, and there are a large number of areas not connected by fractures between two adjacent...

AI Technical Summary

Problems solved by technology

Aiming at the address characteristics of atmospheric shale gas reservoirs and the existing well completion methods and fracturing methods that cannot meet the requirements of economical and efficient development of atmospheric shale gas reservoirs, the present invention provides an atmospheric shale gas screen The method of hydraulic injection volume fracturing method for well completion can ensure multi-cluster volume fracturing construction in normal pressure shale gas horizontal wells, can greatly increase the stimulation volume of normal pressure shale gas fracturing fractures, and improve the performance of normal pressure shale gas. gas development level

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