Optimization design method for hydraulic fracture parameters of repeated fracturing of shale gas horizontal wells

A technology of repeated fracturing and hydraulic fracturing, which is applied in calculation, earthwork drilling, wellbore/well components, etc. It can solve problems such as difficulty in obtaining industrial gas flow, inability to effectively exploit shale gas, and poor distribution of proppant

Inactive Publication Date: 2018-08-24
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

Especially for shale gas horizontal wells with small initial fracturing scale, low proppant concentration, poor proppant distribution, unreasonable fracturing material selection and fracturing design, it is difficult to obtain industrial gas flow, and a large amount of shale gas will still be lost. Occurs in the reservoir and cannot be effectively mined

Method used

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  • Optimization design method for hydraulic fracture parameters of repeated fracturing of shale gas horizontal wells
  • Optimization design method for hydraulic fracture parameters of repeated fracturing of shale gas horizontal wells
  • Optimization design method for hydraulic fracture parameters of repeated fracturing of shale gas horizontal wells

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Embodiment

[0136] Example: The known geological parameters and primary fracturing construction parameters of a typical shale gas reservoir are shown in Table 1:

[0137] Table 1 Geological parameters and construction parameters of shale gas field

[0138]

[0139]

[0140] The present invention relates to a method for optimal design of hydraulic fracture parameters for repeated fracturing of shale gas horizontal wells. The specific steps are as follows:

[0141] (a) Establish a numerical model for productivity prediction of shale gas well refracturing considering the complex fracture morphology and multi-scale flow behavior of shale reservoir after primary fracturing. For the stress balance equation, shale gas flow equation in kerogen, shale gas flow equation in inorganic matter and shale gas flow equation in fracture system included in the model, see equations (1) to (4) respectively.

[0142] (b) Solve the productivity prediction numerical model established in step (a) numerical...

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Abstract

The invention belongs to the technical field of unconventional oil and gas production increasing and transformation, and particularly relates to an optimization design method for hydraulic fracture parameters of repeated fracturing of shale gas horizontal wells. The optimization design method comprises the following steps that (a) a numerical model for predicting the productivity of repeated fracturing of the shale gas wells is established; (b) the established numerical model for capacity prediction is numerically solved and integrally coupled; (c) based on the established numerical model forpredicting the productivity of repeated fracturing , the production of the shale gas wells after repeated fracturing under the different hydraulic fracture parameters is simulated by considering two modes of repeated fracturing and re-perforating repeated fracturing of an original fracture system; and (d) a simulation result of the shale gas horizontal well production is evaluated and analyzed, the optimal hydraulic fracture parameters of the corresponding repeated fracturing mode are obtained. The optimization design method can consider the complex fracture morphology and flow behavior of a shale reservoir, simulate the hydraulic fracture parameters to influence the productivity of the shale gas wells under different repeated fracturing modes, and guide the optimization design of the hydraulic fracture parameters for repeated fracturing of the shale reservoir.

Description

technical field [0001] The invention relates to a method for optimal design of hydraulic fracture parameters for repeated fracturing of shale gas horizontal wells, and belongs to the technical field of unconventional oil and gas stimulation and transformation. Background technique [0002] Affected by reservoir physical properties and multi-scale seepage characteristics, the production of shale horizontal wells will drop sharply in the early stage of production. Especially for shale gas horizontal wells with small initial fracturing scale, low proppant concentration, poor proppant distribution, unreasonable fracturing material selection and fracturing design, it is difficult to obtain industrial gas flow, and a large amount of shale gas will still be lost. It is stored in the reservoir and cannot be effectively mined. [0003] Refracturing achieves the purpose of improving the conductivity of original fractures and increasing the volume of reservoir stimulation by re-perfor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/26E21B49/00G06F17/50
CPCE21B43/26E21B49/00G06F30/17
Inventor 赵金洲任岚黄静胡韵樊珏坤
Owner SOUTHWEST PETROLEUM UNIV
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