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A method for simulating the dynamics of fracture extension driven by hydraulic pressure in water injection wells

A fracture and dynamic technology, which is applied in earth-moving drilling, wellbore/well components, and production fluids, etc., can solve problems such as simulation research on fracture propagation driven by water injection pressure that has not yet been seen, and achieve the effect of low injection rate.

Active Publication Date: 2019-05-31
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] So far, there is no simulation study on the injection pressure driven fracture propagation of injection wells.

Method used

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  • A method for simulating the dynamics of fracture extension driven by hydraulic pressure in water injection wells
  • A method for simulating the dynamics of fracture extension driven by hydraulic pressure in water injection wells
  • A method for simulating the dynamics of fracture extension driven by hydraulic pressure in water injection wells

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Embodiment 1

[0114] Through on-site logging, the geological data of a water injection well in the later stage of development were obtained. The geological characteristics of the target reservoir corresponding to the injection point of the well belong to the typical characteristics of this area, which are representative, that is, high consolidation strength and compactness.

[0115] Simulate calculation routes such as figure 2 , the specific simulation method steps are as follows:

[0116] 1. Obtain the geological parameters of the reservoir through field logging: Poisson’s ratio of rock is 0.1, vertical depth of well is 1600m, reservoir thickness is 40m, initial permeability of formation is 0.5mD, initial porosity is 10%, original formation pressure is 15MPa, elastic Modulus 100000MPa, minimum ground stress 27MPa, crude oil compression coefficient 8.9×10 -4 MPa -1 , rock compression coefficient 5.4×10 -4 MPa -1 , formation water compressibility coefficient 4.0×10 -4 MPa -1 , formati...

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Abstract

The invention discloses a method for simulating water injection well water pressure drive fracture extension dynamic. The method comprises the following steps that an oil reservoir geological characteristic parameter of a target water injection well with fractures is obtained according to the oil reservoir geological study; a water injection well water pressure drive hydraulic fracture extended model is established with the integration of a Darcy leak-off model, a continuity equation, a matter balance equation and an initial condition; fluid volume filtered into a stratum is used as a source item based on an oil-water two-phrase seepage model of a seepage mechanics theory, the boundary condition is established by combining the fluid pressure in the fracture, a hole elastic deformation relationship between a fluid body and a rock is established by being combined with a boundary condition established by the fluid pressure in the fracture, that is, a fluid-solid coupling model is established, and the formation pore pressure is calculated and strain and a pore penetration change which are caused by a change in the fluid pressure are obtained; and then the fracture extension dynamic after the action of the fluid-solid coupling is obtained, then the obtained new parameter is used as an initial condition to be repeated, and finally the fracture extension dynamic is obtained. Accordingto the method for simulating the water injection well water pressure drive fracture extension dynamic, the dynamic extension condition of the fracture in a water injection well and the dynamic changecondition of the parameter in a reservoir can be forecasted according to the construction and geological parameters.

Description

technical field [0001] The invention relates to a method for simulating the hydraulically driven fracture extension dynamics of a water injection well, and belongs to the technical field of oil and gas field development. Background technique [0002] Most of the onshore oil and gas areas have serious formation heterogeneity, high consolidation strength and tightness of the reservoirs. In the later stage of production, most of the water injection well bottoms are seriously polluted and the formation energy is insufficient. Difficult to meet the allocation requirements. In order to solve these problems, water is generally injected with a relatively large displacement, and the pressure is suppressed at the bottom of the well. When the bottom hole pressure exceeds the formation fracture pressure, the formation near the wellbore is opened to penetrate the pollution zone, and then the injection is continued according to the oilfield production requirements. or intermittent inject...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/26E21B49/00
CPCE21B43/26E21B49/00
Inventor 胡永全王强赵金洲杨寨刘常清
Owner SOUTHWEST PETROLEUM UNIV
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