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Refracturing well and layer selecting method based on four-dimensional crustal stress dynamic change

A technology of repeated fracturing and ground stress, applied in design optimization/simulation, special data processing applications, instruments, etc., can solve problems such as limiting oil and gas production, poor fracturing effect, wellbore water flooding, etc., to reduce development costs , avoiding wellbore water flooding, and increasing single well production

Active Publication Date: 2017-07-28
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0002] In the early stage of development of oil and gas resources with water near the reservoir, the fracturing effect is poor due to avoiding the opening of the aquifer, resulting in problems such as too thick filter cake affecting seepage, broken proppant or very limited extension distance of the formed fractures, etc. , and the production of a single well has not been actually improved, so for the nearby water-bearing reservoirs, it is often necessary to take repeated fracturing measures to treat the reservoirs
When refracturing, we have to face such a problem: if water is contained, it will lead to formation water, wellbore water flooding, which seriously limits the production of oil and gas

Method used

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  • Refracturing well and layer selecting method based on four-dimensional crustal stress dynamic change
  • Refracturing well and layer selecting method based on four-dimensional crustal stress dynamic change
  • Refracturing well and layer selecting method based on four-dimensional crustal stress dynamic change

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with accompanying drawing, protection scope of the present invention is not limited to the following:

[0025] A method for selecting wells and layers for repeated fracturing based on the dynamic change of four-dimensional in-situ stress, which comprises the following steps:

[0026] S1. Establish a three-dimensional geological model. The grid model should at least include three-dimensional discrete formation thickness, reservoir physical parameters (porosity, permeability, saturation, sedimentary facies) and rock mechanical parameters Young's modulus and Poisson's ratio ).

[0027] The specific establishment process of the 3D geological model is as follows: first establish the geometric shape of the 3D geological model based on the seismic data, and improve the 3D geological model according to the seismic horizon, fault, seismic facies, rock type, rock attribute, etc. in the interpretation results, an...

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Abstract

The invention discloses a refracturing well and layer selecting method based on four-dimensional crustal stress dynamic change. The method includes the steps that S1, a three-dimensional geologic model is set up; S2, a three-dimensional oil deposit model is set up, and producton / injection dynamic parameters are used for predicting a three-dimensional pore pressure field and a temperature field of different periods; S3, a three-dimensional crustal stress model is set up; S4, an initial three-dimensional crustal stress field is formed; S5, a four-dimensional dynamic crustal stress model is set up; S6, interstifial flow-stress coupling solution is carried out, and dynamic crustal stress and pore elastic parameters are analyzed and calculated; S7, a refractured well and layer position are selected preliminarily; S8, interstifial flow-stress-fracture damage coupling model of refracturing is set up; S9, the final fracturing layer segment is determined. The refracturing well and layer selecting method has the advantages of being capable of accurately reflecting the change condition of dynamic crustal stress and pore elastic parameters in the oil and gas development process, optimizing the refractured well and layer position by combining the interstifial flow-stress-fracture damage coupling model, effectively improving oil and gas recovery degree and avoiding aquifer communicating.

Description

technical field [0001] The invention relates to the field of low-permeability oil and gas resource development of aquifers and computer technology, in particular to a method for selecting wells and layers for repeated fracturing based on the dynamic change of four-dimensional ground stress. Background technique [0002] In the early stage of development of oil and gas resources with water near the reservoir, the fracturing effect is poor due to avoiding the opening of the aquifer, resulting in problems such as too thick filter cake affecting seepage, broken proppant or very limited extension distance of the formed fractures, etc. , and the single well production has not been actually improved, so for the nearby water-bearing reservoirs, it is often necessary to take repeated fracturing measures to treat the reservoirs. When refracturing, we have to face such a problem: if water is contained, it will lead to formation water, wellbore water flooding, which seriously limits the...

Claims

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Application Information

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IPC IPC(8): G06F17/50
CPCG06F30/13G06F30/20
Inventor 唐煊赫刘清友朱海燕陶雷
Owner SOUTHWEST PETROLEUM UNIV
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