Shale gas horizontal well osculating fracturing perforation parameter optimization design method

An optimized design, horizontal well technology, applied in computer-aided design, design optimization/simulation, calculation, etc., can solve the problems of unstable application effect, lack of theoretical basis, unsatisfactory application effect, etc., and achieve simple and intuitive thinking and theoretical basis. The effect of perfect and fast calculation speed

Active Publication Date: 2021-12-28
YANGTZE UNIVERSITY
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Problems solved by technology

However, at present, the optimization design of the perforation flow-limiting method is mostly based on engineering experience and lacks theoretical basis, resulting in unstable application effects of these perforation parameter optimization design methods.
For conventional multi-cluster fracturing horizontal wells with few single-stage perforation clusters, large cluster spacing and weak intra-section stress heterogeneity, it has a certain effect, but for single-stage perforation with many clusters and small cluster spacing , and the cluster stress conditions in the interval are very different, and the application effect is not ideal

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  • Shale gas horizontal well osculating fracturing perforation parameter optimization design method
  • Shale gas horizontal well osculating fracturing perforation parameter optimization design method
  • Shale gas horizontal well osculating fracturing perforation parameter optimization design method

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Embodiment 1

[0152] Example 1: Optimal design of isodensity perforation parameters.

[0153] Taking the shale gas horizontal well FYH1 in the Fuling block as an example, the reservoir drilling rate of this well is high, and the horizontal section basically runs through the same set of reservoirs. When carrying out the fracturing design, it is assumed that the reservoir conditions in the whole well section are homogeneous, and the stress conditions in the same fracturing section are consistent. It is planned to divide 21 sections into dense cutting fracturing, adopt the equal-density perforation method, and perforate 5 to 7 clusters in a single section. The cluster spacing is 7m, and a perforating gun with a 9.5mm aperture is used to carry out the operation. Other basic parameters are shown in Table 1 below. A shale gas horizontal well dense cutting fracturing perforation parameter optimization design method, including the following steps in sequence:

[0154] Table 1 Basic parameters of W...

Embodiment 2

[0161] Example 2: Optimal design of non-isodensity perforation parameters.

[0162] In Example 1, the perforation scheme with 5 holes per cluster has obvious effects on improving the unbalanced expansion of hydraulic fractures in each cluster in the fracturing section, but the production profile test results ( Figure 4 ) indicates that the toe clusters (13th, 15th, 17th fracturing stages) and middle clusters (10th, 11th, 12th, 14th fracturing stages) still have poor hydraulic fracture development in some fracturing stages. Inter-stress interference and intra-section stress heterogeneity, in order to improve this adverse effect, it is necessary to adopt a non-isodensity perforation scheme, increase the number of perforation clusters with poorly developed hydraulic fractures, and further improve the hydraulic pressure of each cluster in the section. Non-equilibrium crack expansion problem. In view of the above problems, in Embodiment 2 of the present invention, the 15th and 17...

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Abstract

A shale gas horizontal well osculating cutting fracturing perforation parameter optimization design method comprises the steps that firstly, a displacement discontinuity method is adopted to describe the relation between stress and crack width, fluid flow equations in a shaft and a crack are coupled, and meanwhile the influence of fracturing fluid filtration loss and hole friction resistance is considered; a complete fluid-solid coupling shale gas horizontal well close cutting fracturing multi-crack synchronous expansion model is established; secondly, a displacement discontinuity method and a finite volume method are adopted to discretize the multi-fracture expansion model, a Newton-Raphson iteration method is adopted to solve a global nonlinear coupling equation set, and a calculation program is compiled; and finally, calculating the uniform development degree index of each cluster of hydraulic fractures under different perforation parameter scheme conditions, and determining the optimal perforation parameter scheme by referring to the quantitative standard of the optimized perforation parameters. The defect that the application effect is unstable due to the fact that existing perforation parameter optimization design is only based on engineering experience and lacks theoretical basis is overcome, and a new method is provided for perforation parameter optimization design of close cutting fracturing of the shale gas horizontal well.

Description

technical field [0001] The invention belongs to the field of oil and gas field development, and in particular relates to a method for optimally designing perforation parameters of dense cutting and fracturing in horizontal wells of shale gas. Background technique [0002] At present, "fracture network fracturing" stimulation has become a prerequisite for the efficient development of unconventional oil and gas reservoirs. Some scholars also call it "volume fracturing", that is, to consciously use hydraulic fractures to connect natural fractures in the reservoir and make them close. The part of the fracture is reopened, and the opened part is connected with each other, so that a large-scale complex fracture network is formed in the formation, which promotes the efficient flow of oil and gas in the formation to the wellbore. Horizontal well staged multi-cluster fracturing technology is the most effective technical means to achieve fracture network fracturing in unconventional o...

Claims

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Application Information

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IPC IPC(8): G06F30/28E21B43/11E21B43/26G06F113/08G06F119/14
CPCG06F30/28E21B43/11E21B43/26G06F2119/14G06F2113/08
Inventor 许文俊王雷宋志康马阔
Owner YANGTZE UNIVERSITY
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