Method and device for acquiring hydrofracture bursting pressure

Abstract

The embodiment of the invention provides a method and device for acquiring a hydrofracture bursting pressure, wherein a stratum ground stress parameter, a pore fluid pressure value, a casing mechanical parameter, a cement sheath mechanical parameter and a stratum mechanical parameter are obtained; and under effects of a shaft fluid pressure and ground stress, a casing stress field distribution model, a cement sheath stress field distribution model and a stratum stress field distribution model are established respectively. According to the casing stress field distribution model, the cement sheath stress field distribution model and the stratum stress field distribution model which are already established, a well-circumference stress field model under a well-cased perforation completion condition can be established; and then, the hydrofracture bursting pressure can be acquired according to the well-circumference stress field model, hydrofracture theories and bursting norms. In comparison with existing methods for acquiring the hydrofracture bursting pressure, the method for acquiring the hydrofracture bursting pressure provided by the embodiment of the invention considers more comprehensive factors and is closer to actual well completion situations.

Description

technical field [0001] The invention relates to the field of petroleum engineering fracturing, in particular to a hydraulic fracturing fracture pressure obtaining method and device. Background technique [0002] In the process of oil and gas field development, especially in the development of low permeability oil and gas fields, casing perforation hydraulic fracturing is a necessary completion measure, and the accurate calculation of hydraulic fracturing fracture pressure has an important impact on the optimal design of hydraulic fracturing. [0003] In the prior art, it is usually considered that there are tiny cracks between the cement sheath and the formation. During the fracturing process, the fracturing fluid directly enters the tiny cracks, which is inconsistent with the actual situation, which is not conducive to the hydraulic fracturing pressure. Calculate accurately. Contents of the invention [0004] In view of this, the embodiment of the present invention provi...

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Problems solved by technology

[0004] In view of this, the embodiment of the present invention provides a hydraulic fracturing fracture pressure acquisition method and device to improve the hydraulic fracturing process, assuming that the fracturing fluid directly enters the tiny fractures, which is not conducive to the accurate calculation of the hydraulic fracturing fracture pressure. question

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