Displacement optimizing method for forming complex fracture network for hydraulic fracturing of natural fracture development reservoir

Abstract

The invention discloses a displacement optimizing method for forming a complex fracture network for hydraulic fracturing of a natural fracture development reservoir. The method includes the steps of obtaining stress parameters and geological physical parameters of the reservoir according to a rock mechanics experimental result, determining the fracturing pressure of a stratum according to the injection pressure of well bottom fracturing liquid during fracturing of the reservoir, measuring the tilt angle of the natural fracture stratum according to the rock core analytical test to obtain the fracturing pressure, determining the opening and crack initiation pressure of preferential opening and crack initiation of natural fractures around a well according to the pressure action of pore fluid,calculating the perforation friction loss according to the resistance generated when fluid in a sleeve enters pores, determining the friction loss in a perforation channel according to perforation design parameters, then determining the impact force generated when high-velocity fracturing fluid acts on the sections of the front ends of the fractures, and finally obtaining the fracturing construction displacement parameters. By selecting different displacements for different reservoirs, the natural fracture development reservoir can be effectively refitted, the complex fracture network is formed, and the production increasing effect and the refitting effect are improved.

Description

Technical field [0001] The invention belongs to the technical field of petroleum engineering, and particularly relates to a method for optimizing the displacement of a complex fracture network formed by hydraulic fracturing of a reservoir with natural fractures. Background technique [0002] Hydraulic fracturing technology is an important measure to increase production of oil and gas reservoirs. Volume fracturing is a new type of fracturing technology for wells with natural fractures. The principle is to rupture and extend the formation with natural fractures to form three-dimensional complex fractures through hydraulic hydraulic action. Through the pressure transmission of fracturing fluid, induced stress is generated on the fragile surface of a single fracture to change the maximum and minimum principal stress distribution , The cracks turn around and communicate with the natural cracks to form a reticular crack structure, and finally realize the effective reconstruction of th...

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Problems solved by technology

[0005] At present, there are many design methods for optimizing hydraulic fracturing construction parameters at home and abroad, but for the section where natural fractures are developed and complex fracture networks are formed after reservoir compression, the theory of optimizing hydraulic fracturing construction parameters from the perspective of construction displacement is still very limited. less, unable to meet the current site construction design requirements, unable to effectively open the reservoir rock body during the fracturing process, low communication efficiency for natural fractures, and poor effect on oil and gas reservoir stimulation and stimulation

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