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Two-dimensional fracture network expansion model coupled with oil reservoir fluid flow and simulation method thereof

A fluid flow and fracture network technology, applied in complex mathematical operations, instruments, electrical and digital data processing, etc., can solve problems such as complex simulation model calculations, and achieve the effect of reducing difficulty

Pending Publication Date: 2020-05-08
CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

The extension simulation of network fractures is an important part of hydraulic fracturing design. Many scholars have proposed mathematical models for simulating fracture networks. Investigations have found that the simulation of fracture networks is mainly based on the interaction criteria between natural fractures and hydraulic fractures. The expansion and diversion of natural fractures, and then communicate with other natural fractures to generate a fracture network, the calculation of the simulation model is complex

Method used

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  • Two-dimensional fracture network expansion model coupled with oil reservoir fluid flow and simulation method thereof
  • Two-dimensional fracture network expansion model coupled with oil reservoir fluid flow and simulation method thereof
  • Two-dimensional fracture network expansion model coupled with oil reservoir fluid flow and simulation method thereof

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Embodiment

[0041] A two-dimensional fracture network expansion model coupled with reservoir fluid flow and a simulation method thereof, comprising the following steps:

[0042] Step a: Establish solution area

[0043] The dynamic coordinates are used to represent the expansion of the hydraulic fracture network, and the static coordinates are used to represent the natural fractures that have not been activated. The entire dynamic and static coordinates are composed as follows figure 1 The solution region shown. During fluid injection, natural fractures open and expand. When the fracture extends to the intersection of the hydraulic fracture and the natural fracture and the fluid pressure at the intersection is greater than the normal stress of the fracture surface, the natural fracture will also open and form a hydraulic fracture network. Thus, injected fluid serves to open closed natural fractures and propagate natural fractures in both directions from the point of intersection.

[004...

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Abstract

The invention belongs to the technical field of oil field development, and particularly discloses a two-dimensional fracture network expansion model coupled with oil reservoir fluid flow and a simulation method thereof, which are based on the idea of coupled flow of natural fractures and matrixes in double media, take the fractures and the matrixes as two relatively independent flow systems, establish the model and perform simulation. By adopting the scheme of the invention, the model can obtain the network fracture geometric dimensions at different times by solving the fluid pressure and fracture width at the intersection point of the natural fractures and the flow equation of the matrix block through coupling.

Description

technical field [0001] The invention belongs to the technical field of oil field development, and in particular relates to a two-dimensional fracture network expansion model coupled with reservoir fluid flow and a simulation method thereof. Background technique [0002] A large number of studies have shown that natural fractures may change the extension path of hydraulic fractures, and fractured reservoirs may form multi-branched, non-planar complex fractures. Laboratory experiments have found that under certain approach angle and stress difference conditions, natural fractures will change the extension path of hydraulic fractures. In recent years, many researchers have begun to use numerical simulation methods to study the influence of natural fractures on hydraulic fractures. Microseismic monitoring has confirmed that hydraulic fractures in shale reservoirs will extend into complex fracture networks. It can be seen that the hydraulic fracture extension mode of fractured f...

Claims

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Application Information

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IPC IPC(8): G06F30/20G06F119/14G06F17/11
CPCG06F17/11Y02A10/40
Inventor 李志强戚志林严文德黄小亮肖晖
Owner CHONGQING UNIVERSITY OF SCIENCE AND TECHNOLOGY
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