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Fractured carbonate rock acid fracturing matching optimization method considering stress sensitivity

A carbonate rock, stress-sensitive technology, used in earthwork drilling, data processing applications, and production fluids, etc., can solve the problem that the optimization of acid fracturing and fracture matching is no longer reliable, and achieve reliable principles, improve accuracy, and calculate efficient effect

Active Publication Date: 2020-06-02
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Due to the existence of these three factors, it is no longer reliable to use the previous method to optimize the matching of acid fracturing fractures

Method used

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Embodiment Construction

[0043] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the following will clearly and completely describe the technical solutions of the embodiments of the present invention in conjunction with the drawings of the embodiments of the present invention. Apparently, the described embodiments are some, not all, embodiments of the present invention. Based on the described embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044]Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the usual meanings understood by those skilled in the art to which the present disclosure belongs. The words "comprising" or "comprising" and similar words used in the present disclosure mean that the elements or things appearing bef...

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Abstract

The invention discloses a fractured carbonate rock acid fracturing matching optimization method considering stress sensitivity. The fractured carbonate rock acid fracturing matching optimization method includes the steps that S1, a reservoir model is established and a grid is divided; S2, the etching width of a natural fracture and hydraulic fracture is input to obtain permeability of the corresponding grid; S3, fluid pressure distribution of a reservoir at the end of a time step is calculated; S4, the fluid pressure distribution of the reservoir is substituted into step S2 to calculate the acid corrosion fracture flow conductivity considering the stress sensitivity at the current time step, and the permeability of the hydraulic fracture and natural fracture is re-evaluated; S5, steps S2 to S4 are repeated until the pressure distribution in the reservoir within the total time of productivity simulation is obtained; S6, a dynamic productivity index under the reference closure stress iscalculated, and the time step of a stable section is determined; and S7, a dimensionless productivity index curve plate in the stable section with different construction parameters is calculated, andthe optimized construction parameters are read according to the plate. The fractured carbonate rock acid fracturing matching optimization method is conducive to accurately and preferably selecting theacid fracturing construction parameters of the fractured reservoirs.

Description

technical field [0001] The invention relates to the technical field of petroleum engineering, in particular to a method for optimizing the matching of acid fracturing fractures in fractured carbonate rocks in consideration of stress sensitivity. Background technique [0002] In recent years, many deep fractured carbonate reservoirs have been discovered in the Sichuan Basin and the Tarim Basin, and have become a key field of oil and gas exploration and development in China. Such reservoirs have well-developed natural fractures, and the matrix has relatively poor seepage storage capacity. Acid fracturing is one of the main methods for improving such reservoirs. [0003] Acid fracturing (referred to as acid fracturing) refers to squeezing acid liquid into the reservoir under the pressure higher than the fracture pressure of the reservoir or the closing pressure of natural fractures to form hydraulic fractures in the reservoir. At the same time, the acid liquid reacts chemicall...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B47/06E21B47/00G06Q50/02
CPCE21B43/26E21B47/00E21B47/06G06Q50/02
Inventor 郭建春任冀川苟波王世彬
Owner SOUTHWEST PETROLEUM UNIV
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