Spacing optimizing method for horizontal well volume fracturing clusters

A volume fracturing and optimization method technology, applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc., can solve problems such as cluster spacing optimization, increase the volume of reservoir stimulation, and avoid excessive fracture deflection Effect

Inactive Publication Date: 2017-10-10
CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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Problems solved by technology

[0009] The purpose of the present invention is to solve the problem of cluster spacing optimization in the current multi-cluster fracturing design process of horizontal wells

Method used

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  • Spacing optimizing method for horizontal well volume fracturing clusters
  • Spacing optimizing method for horizontal well volume fracturing clusters
  • Spacing optimizing method for horizontal well volume fracturing clusters

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Embodiment 1

[0029] This embodiment provides a method for optimizing the spacing between volumetric fracturing clusters in a horizontal well, which includes the following steps:

[0030] Step 1) Minimum cluster spacing optimization: when the fracture fluid pressure is a constant value, the minimum cluster spacing between two clusters of fractures is obtained within the allowable deflection angle range of the fractures of each hydraulic fracturing hole;

[0031] Step 2) Optimizing the maximum stimulated volume cluster spacing: when the fracture fluid pressure is a constant value, calculate the reservoir stimulated volume between two corresponding clusters of fractures at each cluster spacing, and the cluster spacing corresponding to the maximum reservoir stimulated volume is the maximum stimulated volume volume cluster spacing;

[0032] Step 3) Compare the minimum cluster spacing and the maximum cluster spacing of the modified volume under the same fracture fluid pressure, and the larger of...

Embodiment 2

[0035] On the basis of Embodiment 1, this embodiment provides a method for optimizing the cluster spacing of horizontal well volume fracturing. The volume of the reservoir stimulation is calculated by calculating the steering angle of the intermediate principal stress between two clusters of fractures during the fracturing process. When the steering angle of the intermediate principal stress between two clusters of fractures exceeds a certain value, this area is the area to be stimulated, and the corresponding volume is the volume of reservoir stimulation.

[0036] The steering angle calculation process of the intermediate principal stress is as follows:

[0037] Divide the volume between two clusters of fractures into m equal parts, the stress tensor on each equal part The eigenvalues ​​and eigenvectors of the stress tensor S on each equalization are obtained separately, and the eigenvector n corresponding to the intermediate eigenvalue is the direction of the intermediate p...

Embodiment 4

[0043] On the basis of Example 3, this example uses the in-situ stress parameters and rock mechanics parameters of tight sandstone reservoirs in Changqing Oilfield to optimize the minimum cluster spacing and the maximum stimulated volume cluster spacing to obtain a reasonable optimal cluster spacing. In the following calculation example, the calculation and analysis are carried out for three different fracture fluid conditions of 58MPa, 61MPa and 64MPa. In-situ stress parameters and rock mechanics parameters are shown in Table 1.

[0044] Table 1 In-situ stress parameters and rock mechanics parameters

[0045]

[0046] 1) Minimum cluster spacing optimization:

[0047] The allowable value of the fracture deflection angle is different, and the result of the minimum cluster spacing will also change. figure 1 The deflection near the fracture is given when the fracture fluid pressure is 64MPa. The middle gray area represents that the deflection angle of the intermediate princi...

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Abstract

The invention provides a spacing method for horizontal well volume fracturing clusters. A finite element numerical simulation method is adopted, on the basis of ABAQUS finite element software, from the two aspects of reduction of the disadvantageous influence of the stress penumbra effect and utilization of the advantageous influence of the stress penumbra effect, a smallest cluster spacing optimizing model and a largest transformed volume cluster spacing optimizing model are built; the stress steering angle and the transformed volume are calculated; and finally, the optimal cluster spacing is determined by combining the optimized result of the smallest cluster spacing and the largest transformed volume cluster spacing. On the one hand, major fractures successively extend out, a horizontal well is segmentally fractured into a stratum to form the multiple major fractures, and on the other hand, the induced stress between the fractures is large as possible, so that branched fractures turn, the connectivity of natural fractures including the branched fractures and the major fractures is enhanced, a channel structure of oil gas flowing towards the major fractures is improved, and finally the purpose for improving the production capacity of an oil gas well is achieved.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and in particular relates to a method for optimizing the cluster spacing of horizontal well volume fracturing. Background technique [0002] Unconventional oil and gas reservoirs, especially tight sandstone reservoirs, usually have low porosity and low permeability. In order to achieve good economic development, large-scale hydraulic fracturing is often required. Most tight sandstone reservoirs have high elastic modulus, and under the complex geological structure movement, hydrocarbon generation and chemical action, a large number of natural fractures and discontinuous structural planes of different scales will be formed inside the reservoir. These discontinuous structural planes have high permeability relative to the matrix, which is the key to the successful development of tight reservoirs. During the hydraulic fracturing process, the fracturing fluid will leak to both sides of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26
CPCE21B43/26
Inventor 刘欢池晓明包小红尹俊禄高红平杨燕段凯陶长州李杉杉袁伟文
Owner CHINA NAT PETROLEUM CORP CHUANQING DRILLING ENG CO LTD CHANGQING DOWNHOLE TECH CO
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