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Device and method for simulating gas flowing of matrix-crack system

A technology of gas flow and crack system, which is applied in the direction of measuring devices, suspension and porous material analysis, instruments, etc., and can solve the problems of immature gas flow simulation technology, inability to truly simulate gas flow process, singleness, etc.

Active Publication Date: 2019-07-16
CHINA UNIV OF PETROLEUM (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Numerical simulation methods consider the effects of temperature, stress and other factors to varying degrees, but most of the flow models are established based on experimental data at normal temperature and pressure, or the gas flow form is simplified, which cannot accurately characterize the gas flow in the matrix under reservoir conditions. Real physical processes such as slippage and non-Darcy flow in cracks
[0004] In addition, due to the limitation of experimental conditions, the gas flow simulation technology for high-temperature and high-pressure tight gas reservoirs is still immature. The indoor simulation simplifies the connection mode of matrix and fractures, and only simulates the flow of gas in matrix or fractures, which cannot be simulated realistically. The complete gas flow process of gas from the matrix to natural fractures and artificial fracture systems after fracturing in tight gas reservoirs restricts the development and improvement of gas flow models

Method used

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  • Device and method for simulating gas flowing of matrix-crack system
  • Device and method for simulating gas flowing of matrix-crack system
  • Device and method for simulating gas flowing of matrix-crack system

Examples

Experimental program
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Effect test

Embodiment 1

[0086] For a tight gas reservoir, the reservoir depth is 2090m-4080m, the reservoir temperature is 80°C-120°C, the formation pressure is 38MPa-54MPa, the core matrix porosity is 2%-7%, and the overburden permeability is 10% -4 mD~10 -2mD, with developed structural fractures, increased production after acid fracturing.

[0087] Downhole cores were taken to prepare matrix cores and natural fracture cores, and a core combination with a matrix core-natural fracture core permeability ratio of about 1:2 was selected, combined with split artificial steel blocks to form a matrix-fracture system, and placed in sequence in the In the three-stage core holder, the confining pressure is applied, and the core is wrapped with a rubber sleeve.

[0088] The experimental temperature is 80°C, the initial gas pressure is 5MPa, the effective stress is 10MPa, and the gas pressure is gradually increased to 40MPa at intervals of 5MPa; under each gas pressure, when the pressure indication numbers of ...

Embodiment 2

[0092] The selected research area is a high temperature and high pressure tight gas reservoir, the reservoir depth is 6000m-8000m, the reservoir temperature is 120°C-180°C, the formation pressure is 90MPa-140MPa, the core matrix porosity is 4.3%-5.5%, and the overburden Pressure permeability is less than 10 -4 mD~10 -2 mD, with developed structural fractures, increased production after acid fracturing.

[0093] Downhole coring, drilling matrix cores and natural fracture cores, selecting a core combination with a matrix core-natural fracture core permeability ratio of about 1:27, combining with split artificial steel blocks to form a matrix-fracture system, and placing them in order Put it in the three-stage core holder, apply confining pressure, and wrap the core with a rubber sleeve.

[0094] In order to ensure the safety of the experiment as much as possible, the experimental temperature is 80°C, the initial gas pressure is 10MPa, the effective stress is 10MPa, and the pre...

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Abstract

The invention discloses a device and method for simulating gas flowing of a matrix-crack system. The device comprises a gas pressurizing injection system, a model system, a constant temperature control system and a metering system which are sequentially connected, and the gas pressurizing injection system comprises a gas source tank and a pressurizing mechanism for pressurizing gas flowing out ofthe gas source tank; the model system comprises three stages of rock core gripper connected in series, a confining pressure pump for providing the confining pressure for each stage of rock core gripper, and pressure gauges arranged at the inlet ends of the rock core grippers correspondingly; the three stages of rock core grippers are sequentially filled with matrix rock cores, natural crack rock cores and manual crack rock cores; and the constant temperature control system is arranged outside the model system and used for simulating the formation temperature; and the metering system comprisesa flow meter arranged at the outlet end of the last stage of rock core gripper, and a temperature sensor. Flowing of the gas in the reservoir matrix-crack system can be simulated under high temperature and high pressure conditions.

Description

technical field [0001] The invention relates to the technical field of oil and gas reservoir development, in particular to a matrix-fracture system gas flow simulation device and method. Background technique [0002] my country's tight gas reservoirs have large resource reserves, but their natural production capacity is low. Large-scale fracturing is needed to achieve economic production capacity and improve the ultimate recovery rate. After fracturing, the hydraulic fractures communicate with the natural fractures in the reservoir, shortening the gas flow distance from the matrix to the artificial fractures, forming a complex fracture network and matrix-natural fractures-artificial fracture multi-scale flow system. In-depth understanding of the coupling flow process of gas in the matrix, natural fractures and artificial fracture systems after fracturing in tight gas reservoirs, and clarification of the influence of reservoir characteristics such as high temperature and high...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 曲鸿雁左洁周福建杨凯胡佳伟李奔姚二冬梁天博
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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