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A calculation method for refracturing productivity of shale gas horizontal wells

A technology for repetitive fracturing and productivity calculation, applied in calculation, earthmoving, wellbore/well components, etc., and can solve problems such as unsuitability

Active Publication Date: 2018-06-05
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0005] The present invention provides a method for calculating the production capacity of repeated fracturing of shale gas horizontal wells. -Dynamic change of pressure field, considering triple porous medium reservoirs, reasonably predicting productivity and recovery rate of refracturing of shale reservoirs, guiding optimization design of refracturing of shale gas horizontal wells

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  • A calculation method for refracturing productivity of shale gas horizontal wells
  • A calculation method for refracturing productivity of shale gas horizontal wells
  • A calculation method for refracturing productivity of shale gas horizontal wells

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Embodiment Construction

[0123] The present invention will be further described below in conjunction with the drawings and embodiments.

[0124] Such as figure 1 As shown, the present invention is a method for calculating the re-fracturing productivity of a shale gas horizontal well. The method includes the following steps:

[0125] (a) Regarding the shale reservoir as a small deformed elastic material, considering the external stress, pore pressure and shale gas desorption effect to cause the deformation of the rock mass skeleton, the stress-strain model and the dynamic model of the reservoir physical parameters are established, and given Initial and boundary conditions;

[0126] The deformation of the shale rock mass skeleton is the effective stress of multiple media composed of external stress, pore pressure and shale gas desorption effect, expressed as:

[0127] σ′ ij =σ ij -(α m P m +α k P k +α f P f )δ ij (1)

[0128] In formula (1):

[0129] σ′ ij Effective stress of multiple media, MPa;

[0130] P k Is...

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Abstract

The invention belongs to the technical field of unconventional oil and gas stimulation and transformation, and specifically relates to a method for calculating the production capacity of repeated fracturing of shale gas horizontal wells. Stress-strain model and dynamic model of reservoir physical parameters; establish continuity equations in kerogen and inorganic matter; numerically solve the established solid deformation control equation and shale gas multi-scale seepage equation; shale gas well reservoir Bring geological parameters, physical property parameters and initial fracturing design parameters into the shale gas flow-solid coupling numerical model to record reservoir pressure field and hydraulic fracture conductivity; bring refracturing design parameters into the shale gas flow-solid coupling numerical model , to calculate the productivity of shale gas wells after repeated fracturing. The method of the invention considers the seepage characteristics of the shale reservoir and the dynamic change of the stress-pressure field, predicts the productivity and recovery rate of the refracturing of the shale reservoir, and guides the optimal design of the refracturing of the shale gas horizontal well.

Description

Technical field [0001] The invention relates to a shale gas horizontal well repeated fracturing productivity calculation method, which belongs to the technical field of unconventional oil and gas stimulation and reformation. Background technique [0002] Volume fracturing technology is an effective technical means to realize the industrial exploitation of shale gas, and it is widely used in North America and China's Sichuan Basin and other shale oil and gas development. As the pressure of the shale reservoir decreases during the production process, the conductivity of the fracture system also decreases as the effective formation stress increases, causing the production of shale gas wells to drop sharply and maintaining long-term stable and low production. Repeated fracturing of old wells through chemical temporary plugging or mechanical isolation methods to form a more complex fracture network and larger reconstruction volume can effectively increase the production and recovery e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F17/50E21B43/26
Inventor 赵金洲黄静任岚李志强吴雷泽李高敏曾蓉
Owner SOUTHWEST PETROLEUM UNIV
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