A method for establishing a three-dimensional percolation model of a volume fracturing horizontal well in a tight reservoir

A tight oil reservoir and volumetric fracturing technology, which is applied in the field of petroleum development and model establishment, can solve the problems of not considering the thickness of tight oil reservoirs, not considering the intersection of different fractures, etc., and achieve fast calculation speed, efficient development and accurate simulation calculated effect

Active Publication Date: 2019-03-08
XI'AN PETROLEUM UNIVERSITY
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Problems solved by technology

[0005] However, the current seepage models of volumetric fracturing horizontal wells in tight oil reservoirs based on the boundary element method are all two-dimensional models, and the fractures are considered to be vertical fractures, such as figure 1 As shown, not only did not consid

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  • A method for establishing a three-dimensional percolation model of a volume fracturing horizontal well in a tight reservoir
  • A method for establishing a three-dimensional percolation model of a volume fracturing horizontal well in a tight reservoir
  • A method for establishing a three-dimensional percolation model of a volume fracturing horizontal well in a tight reservoir

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[0054] The present invention will be specifically introduced below in conjunction with the accompanying drawings and specific embodiments.

[0055] 1. Establish the basic solution of 3D seepage based on the boundary element method

[0056] 1. Establish a point source physical model of infinite tight reservoir space

[0057] It is assumed that there is a point in the infinite dual-media tight oil reservoir, and the liquid at this point is produced instantaneously, and the liquid at this point will cause the flow of liquid at other positions in the tight oil reservoir. The point source physical model of infinite tight reservoir space is as follows: image 3 shown.

[0058] Dual-matrix tight reservoirs are described by the Warren-Root model. The matrix system is the main storage space for liquid, and the natural microfracture system is the main flow channel for liquid.

[0059] 2. Establish a mathematical model corresponding to the point source physical model

[0060] The pro...

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Abstract

The invention discloses a method for establishing a three-dimensional percolation model of a volume fracturing horizontal well in a tight reservoir, which comprises the following steps of firstly establishing a three-dimensional percolation basic solution based on a boundary element method; establishing a point source physical model of a space of an infinite tight reservoir; establishing the mathematical model corresponding to the physical model of point source, solving the mathematical model to obtain the three-dimensional percolation basic solution; secondly, establishing the seepage model based on the basic solution of three-dimensional seepage; transforming the differential equation of regional seepage into the boundary integral equation; discreting the boundaries into finite-sized boundary elements; discreting the boundary integral equation on the boundary element; and writing the algebraic equation in the form of a matrix equation; depending on whether the boundary stress and flow rate are known, performing the corresponding operation. The invention has the advantages that the three-dimensional seepage flow model is obtained, the influence of the intersection of different fractures and the stress sensitivity of the reservoir is considered, and the influence of the complex fracturing network on the seepage flow can be more truly simulated.

Description

technical field [0001] The invention relates to a method for establishing a model, in particular to a method for establishing a three-dimensional seepage model of a volumetric fracturing horizontal well in tight oil reservoirs, and belongs to the technical field of petroleum development methods. Background technique [0002] my country is rich in tight oil reservoir resources. Changqing Oilfield, Yanchang Oilfield, Jilin Oilfield and Xinjiang Oilfield have all used volume fracturing horizontal well technology to develop tight oil reservoirs. In 2016, the national tight oil production was 150×10 4 Ton. [0003] After volume fracturing in tight oil reservoirs, a very complex fracture network is formed. The fluid seepage in the reservoir is a multi-scale coupled flow, and the seepage in the reservoir is extremely complex. [0004] There are three main methods for establishing seepage numerical models of volumetric fractured horizontal wells in tight reservoirs: finite differen...

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/20
Inventor 任宗孝蒋海岩黄兴袁士宝徐建平马加传严锐涛
Owner XI'AN PETROLEUM UNIVERSITY
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