Method for predicting production effect of shale reservoir after size modification

A technology of production effect and volume transformation, applied in the fields of fluid production, earthwork drilling, wellbore/well components, etc., can solve the problem of not taking into account the stress-sensitive effect of heterogeneity in ultra-low permeability gas reservoirs at the same time

Inactive Publication Date: 2016-04-20
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] At present, the production prediction models for volumetric fracturing of horizontal wells mainly include dual-linear flow, tri-linear flow, and five-linear flow and other seepage models. None of the above models considers the heterogen

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  • Method for predicting production effect of shale reservoir after size modification
  • Method for predicting production effect of shale reservoir after size modification
  • Method for predicting production effect of shale reservoir after size modification

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[0182] Example

[0183] This embodiment applies a method for predicting the production effect after volume fracturing of a shale reservoir, which is specifically as follows:

[0184] The basic parameters of a horizontal well in a heterogeneous shale gas reservoir are as follows: the heterogeneous gas reservoir is 1000m long, 120m wide, 20m thick, 3% porosity, closed boundary pressure 30MPa, horizontal wellbore pressure 25MPa, total Three heterogeneous seepage zones, matrix permeability deformation factor is 0.015MPa -1 ; Using a packer to perforate multiple clusters in segments, a total of 9 cracks are formed, see Table 1. The semi-length of all the slits is 60m, and the volume of the single slit is 20m (width of the slit) × 120m (length of the slit) × 20m (height of the slit) = 48000m 3 , The fracture network high permeability zone has a permeability of 10mD, a natural gas viscosity of 0.0215mPa·s, a natural gas deviation coefficient of 0.9218, and a reservoir rock density of 2600...

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Abstract

The invention discloses a method for predicting production effect of a shale reservoir after size modification. The method mainly includes following steps: collecting basic parameters of the reservoir, fluid and a horizontal wellbore; dividing a heterogeneous gas reservoir into at least two vadose zones along the length direction of the horizontal wellbore, wherein each vadose zone contains artificial fractures; building a vadose unit simulation model for each vadose zone; building vadose simulation models of at least two vadose units; coupling the vadose simulation models of the vadose units, and predicting the production effect of a heterogeneous gas reservoir fractured horizontal well in a stable state; discretizing time, and repeating the steps 1-5. By the technical scheme, the defect that only prediction on homogeneous shale reservoirs can be realized without considering starting pressure gradient and stress sensitive effect is overcome, and comprehensive evaluation on the production effect of the shale reservoir after size modification can be realized.

Description

technical field [0001] The application belongs to the field of oil and gas field development, and in particular relates to a method for predicting the production effect of shale reservoirs after volume reformation. Background technique [0002] With the rapid development of the global energy industry and the increasing demand for energy, more and more low-permeability oil and gas reservoirs have been put into development and utilization. Ultra-low permeability gas reservoirs are characterized by extremely low reservoir permeability, plane heterogeneity, starting pressure gradient, and stress-sensitivity effects. Fracturing horizontal well technology is one of the key technologies for increasing reserves and production of ultra-low permeability gas reservoirs and economically and effectively developing them. However, the stimulation mode of conventional fracturing to form a single fracture cannot effectively communicate with the reservoir, and it is difficult to achieve effic...

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Application Information

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IPC IPC(8): E21B49/00E21B43/26
CPCE21B49/087E21B43/26
Inventor 曾凡辉龙川郭建春
Owner SOUTHWEST PETROLEUM UNIV
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