Fracturing method for complex seam of dense sandstone gas reservoir

Abstract

The invention relates to the technical field of geophysics, in particular to a fracturing method for a complex seam of a dense sandstone gas reservoir. The fracturing method solves the technical problems that a fracture formed by conventional fracturing shows the sand-levee-type non-uniform laying situation, communicating of the reservoir matrix space cannot be better achieved, after transformation, the yield often does not meet the expected requirements, and the stable yield difficulty is large. The fracturing method comprises the steps that in the stage of prepad fluid, fracturing fluid is injected into a formation; in the stage of sand-carrying fluid, the fracturing fluid continues to be injected into the formation, and meanwhile, a proppant is continuously pumped; and in the stage of displacement fluid, the fracturing fluid is fully injected into a wellbore. The fracturing method for the complex seam of the dense sandstone gas reservoir at least has the following advantages that through the fracturing method, the finally-formed fractures are evenly laid, communicating of the reservoir matrix space can be better achieved, the yield is increased after transformation, the expectedrequirements are met, and the stable yield is facilitated.

Description

technical field [0001] The invention relates to the technical field of geophysics, in particular to a method for fracturing complex fractures of tight sandstone gas reservoirs. Background technique [0002] Existing fracturing of tight sandstone reservoirs mainly uses relatively high-viscosity cross-linked liquid to carry proppant with certain strength to form a double-wing propped fracture with certain flow-conducting capacity in the formation. This fracturing method forms a double-wing support fracture with high conductivity in the reservoir, which can achieve a certain stimulation effect, but due to the settlement problem of proppant in the process of migration in conventional fracturing, resulting in The finally formed fractures present a "sand embankment" non-uniform laying situation. At the same time, for some reservoirs with poor physical properties and poor connectivity, due to the small contact area between the double-wing support fractures and the oil and gas layer...

AI Technical Summary

Problems solved by technology

[0003] The main purpose of the present invention is to provide a new type of fracturing method for complex fractures in tight sandstone gas reservoirs. The technical problem to be solved is that the fractures formed by conventional fracturing present a "sand embankment" non-uniform laying Due to the situation, it is impossible to communicate more with the reservoir matrix space, and the production after transformation often fails to meet the expected requirements, and it is relatively difficult to stabilize production.

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