Compound temporary blocking steering fracturing method capable of improving productivity of sandstone reservoir gas well

Abstract

The invention discloses a compound temporary blocking steering fracturing method capable of improving the productivity of a sandstone reservoir gas well. The method comprises the following steps that1, according to the reservoir stress data, micro-crack development conditions and reservoir brittleness data of the sandstone reservoir gas well, a transformed sandstone reservoir gas well and a transformed sandstone reservoir both of which can be subjected to temporary blocking steering fracturing are selected; 2, according to geological data of the sandstone reservoir gas well and production dynamic data of an adjacent well, in combination with fracturing analysis software for simulation calculation, fracturing construction parameters are determined; 3, the dosage of a composite temporary blocking agent is calculated, wherein the composite temporary blocking agent is composed of a foam temporary blocking agent and a fiber temporary blocking agent, and the dosage of the fiber temporary blocking agent is 3%o of the mass fraction of the foam temporary blocking agent; 4, pump injection construction steps are set, and a fracturing construction pump sequence is designed; 5, a foam temporary blocking agent work liquid is prepared; 6, main fracturing construction is carried out, the composite temporary blocking agent is used for blocking original cracks of the sandstone reservoir gas well, the cracks are subjected to steering, and then construction at a steering fracturing stage is carried out.

Description

technical field [0001] The invention belongs to the technical field of gas well fracturing, and in particular relates to a compound temporary plugging and diverting fracturing method for improving the productivity of gas wells in sandstone reservoirs. Background technique [0002] Fracturing is an important way to transform low-permeability oil and gas reservoirs and realize profitable development. Temporary plugging and diversion fracturing technology can seal the original fractures, realize fracture diversion, and form new fractures, thereby forming a complex fracture network system and increasing gas well drainage area to achieve the purpose of gas well stimulation. [0003] The conventional temporary plugging diversion fracturing method is to inject a chemical temporary plugging agent during the fracturing process to temporarily plug the fractures and force the fractures to divert and extend. Currently, the most widely used temporary plugging agents are chemical tempora...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the deficiencies of the above-mentioned prior art, to provide a composite temporary plugging diversion fracturing method for improving the productivity of gas wells in sandstone reservoirs, and to overcome 1 in the prior art: the presence of both chemical temporary plugging agents and fiber temporary plugging agents The controllability is weak, the increase of fracture extension pressure is not large, the fracture turning extension is not obvious, and turning fractures are not easy to form. 2: The chemical temporary plugging materials cannot be completely degraded, and it is easy to cause great damage to the formation, and the fracture conductivity cannot be greatly improved Ability, 3: Fiber temporary plugging agent has poor plugging ability, fractures are easy to break through, and the effect of improving fracturing stimulation is not obvious, etc.

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