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Optimization method of perforation position for coal-sand interbedded fracturing

An optimization method and hole location technology, applied in design optimization/simulation, earthwork drilling, wellbore/well components, etc.

Active Publication Date: 2021-04-27
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, most of the existing fracture extension models need to introduce the Carter fluid loss coefficient to describe the fracturing fluid fluid loss phenomenon.

Method used

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  • Optimization method of perforation position for coal-sand interbedded fracturing
  • Optimization method of perforation position for coal-sand interbedded fracturing
  • Optimization method of perforation position for coal-sand interbedded fracturing

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Embodiment Construction

[0108] Below in conjunction with a certain well in Shanxi, my country, the present invention is further described in detail, but does not constitute any limitation to the invention, wherein the formation parameters are shown in Table 1.

[0109] Table 1 The table of basic formation parameters used in the calculation of Example 1

[0110]

[0111] Step 1: Scheme 1: Assuming that perforation and fracturing are carried out in the center of the coal seam, the calculation area is as follows figure 2 As shown, the calculation area is evenly divided into 80×80 square units, and the length scale parameter l 0 is 0.5m, and the fracturing displacement q is 2.2×10 -3 m 2 / s, the viscosity of the fracturing fluid is 1mPa.s, the injection time is 36s, the time step used in the simulation is 3s, and the parameters in Table 1 are brought into the equation set established by the present invention for simulation. Simulation results such as image 3 As shown, it is found t...

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Abstract

The invention provides a method for optimizing the perforation position of coal-sand interbedded fracturing fracturing, comprising the following steps: (1) collecting input parameters; (2) establishing a stress calculation equation group; (3) establishing a fluid flow control equation group; 4) Establish the fracture phase field evolution equations; (5) Combine steps (2) to (4) to establish a numerical calculation model for the longitudinal extension of hydraulic fractures in poroelastic media; (6) Input the parameters obtained in step (1) into step (5 ) to optimize the perforation position by comparing fracture trajectories under different formation parameters and perforation position conditions. The fracture extension trajectory and conditions of the present invention are self-adaptively solved, which overcomes the defect that an additional trajectory prediction criterion needs to be established in the prior art to judge the fracture extension direction, and the present invention does not need to introduce a fluid loss coefficient to describe the fluid loss of the fracturing fluid Phenomenon.

Description

technical field [0001] The invention relates to the field of oil and gas field stimulation and transformation, in particular to a method for optimizing the perforation position of coal-sand interbedded perforation fracturing. Background technique [0002] China's coalbed methane fields are rich in natural gas resources. In addition to coalbed methane, this type of gas field also contains abundant tight sandstone gas in the vertical direction, forming coal-sandstone interbeds, and vertically connecting coal and sandstone reservoirs through hydraulic fracturing technology It has become a way of efficient development of this type of gas field. However, due to the influence of the interface between layers and the difference in lithology and ground stress of different layers, if the perforation position is not appropriate, the hydraulic fracture can only extend in one layer. layers are important. [0003] The core of this technology is to establish a model of hydraulic fracture...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F30/23G06F17/11E21B43/00E21B43/26
CPCE21B43/006E21B43/26G06F17/11
Inventor 易良平李小刚杨兆中张丹杨长鑫
Owner SOUTHWEST PETROLEUM UNIV