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Shale gas horizontal well refracturing productivity calculation method

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: 2018-01-23
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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Embodiment Construction

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

[0124] Such as figure 1 As shown, the present invention is a method for calculating the refracturing productivity of a shale gas horizontal well, the method comprising the following steps:

[0125] (a) Taking the shale reservoir as an elastic material with small deformation, considering the deformation of the rock mass skeleton caused by external stress, pore pressure and shale gas desorption effect, establishing a stress-strain model and a dynamic model of reservoir physical parameters, and giving initial and boundary conditions;

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

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

[0128] In formula (1):

[0129] σ' ij is the multi-me...

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Abstract

The invention belongs to the technical field of unconventional oil gas production increasing transformation and particularly, relates to a shale gas horizontal well refracturing productivity calculation method. The method comprises the following steps of: by using a shale reservoir as an elastic material which is small in deformation, establishing a stress-strain model and a reservoir physical property parameter dynamic model; establishing a continuity equation in kerogen and an inorganic substance; respectively carrying out numerical solution on an established solid deformation control equation and shale gas multiscale seepage equation; bringing geological parameters, physical property parameters and primary fracturing design parameters of a shale gas well reservoir into a shale gas fluid-solid coupling numerical model, and recording a pressure field and hydraulic fracture flow conductivity of the reservoir; and bringing refracturing design parameters into the shale gas fluid-solid coupling numerical model, and calculating productivity of a shale gas well after refracturing. According to the method disclosed by the invention, seepage characteristics and stress-pressure field dynamic variations of the shale reservoir are considered, productivity and a recovery ratio of the shale reservoir after refracturing are predicted, and shale gas horizontal well refracturing optimizationdesign is guided.

Description

technical field [0001] The invention relates to a method for calculating the production capacity of repeated fracturing of shale gas horizontal wells, and belongs to the technical field of unconventional oil and gas stimulation and transformation. Background technique [0002] Volume fracturing technology is an effective technical means to realize the industrialized exploitation of shale gas, especially in the shale oil and gas development in North America and China's Sichuan Basin. As the shale reservoir pressure decays during the production process, the conductivity of the fracture system also decreases with the increase of the effective stress of the formation, causing the production of shale gas wells to decline sharply and maintain long-term stable and low production. Refracturing old wells through chemical temporary plugging or mechanical isolation can form more complex fracture networks and larger stimulated volumes, which can effectively improve the production and re...

Claims

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Application Information

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Patent Type & Authority Applications(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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