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Tight gas fracturing horizontal well numerical value well testing model building and solving method

A model building, horizontal well technology, applied in wellbore/well components, earthmoving, electrical digital data processing, etc., can solve the situation where the fractures cannot be unequally spaced, and the multiphase flow in the wellbore and the wellbore are not considered. Trajectory influence, inability to consider reservoir heterogeneity, etc.

Active Publication Date: 2015-09-09
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the conventional fractured horizontal well test model is directly used to interpret and analyze the well test data of fractured horizontal wells in tight gas reservoirs, it will bring difficulties to the fitting of well test interpretation, and the fitting results may also have large gaps. error
[0006] 2) In terms of reservoir heterogeneity, the conventional well test analytical model assumes that the reservoir is a homogeneous medium and cannot take into account the heterogeneity of the reservoir. However, the actual reservoir has obvious heterogeneity, and the reservoir heterogeneity is bound to increase. It has an important impact on tight gas seepage and bottom hole pressure response, so reservoir heterogeneity is not considered at present, and it will also have a certain impact on well test curve fitting and interpretation results
[0007] 3) In terms of fracture distribution, conventional well test analytical models for fracturing horizontal wells are currently unable to deal with the situation where the fractures are not equally spaced, and the actual fracture locations are almost all unequally spaced, which also brings great challenges to practical applications. error
[0008] 4) In terms of wellbore multiphase flow and wellbore trajectory, the influence of wellbore multiphase flow and wellbore trajectory is hardly considered in the well test interpretation models at present
In well test interpretation, the pressure measured by the pressure gauge is usually taken as the pressure of the horizontal wellbore section, which will inevitably lead to errors in well test interpretation

Method used

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  • Tight gas fracturing horizontal well numerical value well testing model building and solving method
  • Tight gas fracturing horizontal well numerical value well testing model building and solving method
  • Tight gas fracturing horizontal well numerical value well testing model building and solving method

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Embodiment 1

[0077] Such as figure 2 A method for establishing and solving a numerical well test model of a tight gas fractured horizontal well is shown, including the following steps:

[0078] Step 1: Generation of 2D geological bodies and 3D geological bodies of fractured horizontal wells in tight gas reservoirs; mainly

[0079] 1) According to the outer boundary of the geological body where the fracturing horizontal well is located, the inner boundary of the wellbore, the fracture and the complex area, and then determine the specific size and shape of the geological body by setting the inner and outer boundaries and the properties of the fracture, and draw and establish a two-dimensional geological body;

[0080] 2) According to the established two-dimensional physique, wellbore trajectory and the positions of the upper and lower boundaries of the reservoir, the three-dimensional geological body is generated by geometric Boolean operation.

[0081] Step 2: If figure 1 The grid discre...

Embodiment 2

[0134] 1. Realize rapid generation of geological bodies in fractured horizontal wells in tight gas reservoirs

[0135] Firstly, a two-dimensional geological body is established, and then converted from a two-dimensional geological body to a three-dimensional geological body. By writing the code for geometric drawing of the software, the functions of drawing the outer boundary of the geological body where the fracturing horizontal well is located, the inner boundary of the wellbore, fractures and composite zones are realized, and then the specific size and shape of the geological body can be determined by setting the inner and outer boundaries and the attributes of the fractures , in this way the two-dimensional geological body can be quickly established. From the two-dimensional geological body, combined with the wellbore trajectory and the position of the upper and lower boundaries of the reservoir, the geometric Boolean operation can be used to directly generate a three-dime...

Embodiment 3

[0145] 1) Rapid generation and display methods of 2D and 3D geological bodies in fractured horizontal wells in tight gas reservoirs;

[0146] Firstly, a two-dimensional geological body is established, and then converted from a two-dimensional geological body to a three-dimensional geological body. According to the horizontal well logging interpretation results, the heterogeneity characteristics of the reservoir are set, including porosity, gas saturation and initial permeability distribution, and different regions are divided in the geological body, each region represents a homogeneous body, each The homogeneous body has different porosity, water saturation and initial permeability, and the heterogeneity of the whole geological system is composed of many different homogeneous bodies. The greater the number of homogeneous bodies and the greater the difference in parameters, the stronger the heterogeneity of the geological body; from the two-dimensional geological body, combined...

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Abstract

The invention provides a tight gas fracturing horizontal well numerical value well testing model building and solving method. The method includes the following steps: step one, generating two-dimensional geologic body and a three-dimensional geologic body of a tight gas reservoir fracturing horizontal well; step two, performing grid discretization on the generated two-dimensional geologic body and the generate three-dimensional geologic body of the tight gas reservoir fracturing horizontal well; step three, calculating a pressure-difference-free seepage model of a horizontal well shaft; step four, building a coupling model, solving the built coupling model, and enabling acquired solutions to generate a well testing theoretical curve; step five, fitting the theoretical curve acquired in step four with a measured curve to acquire parameters of well testing explanation. The method has the advantages of high calculation speed, good curve fitting effect and accurate explanation result.

Description

technical field [0001] The invention relates to a method for establishing and solving a numerical well test model of a tight gas fracturing horizontal well, and belongs to the field of well test of oil and gas wells in the petroleum industry. Background technique [0002] As one of the three major unconventional natural gas, tight gas has abundant resources and great development potential. Tight gas reservoirs are characterized by low permeability, low pressure, and low abundance. The natural production capacity of gas wells is low, and the industrial exploitation value can only be obtained after reservoir reconstruction measures. Hydraulic fracturing technology and horizontal well technology are effective methods to improve the productivity of tight gas reservoirs. At present, the development of tight gas reservoirs generally adopts multi-stage fracturing horizontal well technology. [0003] Well test interpretation of fractured horizontal wells in tight gas reservoirs is...

Claims

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Application Information

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IPC IPC(8): E21B47/00E21B49/00G06F17/50
Inventor 欧阳伟平张冕袁冬蕊李杉杉杨燕孙贺东池小明高红平刘欢徐俊芳
Owner BC P INC CHINA NAT PETROLEUM CORP
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