Fractured shale gas-water two-phase flow fracture conductivity evaluation device and method

A technology for conductivity and evaluation devices, which is applied in the direction of measuring devices, mining fluids, earthwork drilling, etc., can solve the problems that cannot take into account the influence of shale micro-fractures on conductivity, and achieve the effect of simple operation

Pending Publication Date: 2018-03-06
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

The existing shale gas seepage law in micro-fractures is mainly based on the seepage law of gas single-phase in shale micro-fractures through pulse method, differential pressure flow method, etc. in the laboratory, or combined with the seepage law of water single-phase, and The actual development conditions of shale gas are quite different, and the influence of water invasion on the conductivity of shale micro-fractures cannot be taken into account

Method used

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  • Fractured shale gas-water two-phase flow fracture conductivity evaluation device and method
  • Fractured shale gas-water two-phase flow fracture conductivity evaluation device and method
  • Fractured shale gas-water two-phase flow fracture conductivity evaluation device and method

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Experimental program
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Effect test

Embodiment 1

[0048] Cut the shale test sample into a cylinder, perform fracturing, and dry the cut shale test sample at 102°C for 24 hours;

[0049] Obtain the cross-sectional area and length of the dried shale test sample. After drying, coat the side of the cylindrical core with epoxy silica gel, dry it, weigh it, and prepare for the experiment;

[0050] The temperature of thermostat 6 is set to 45°C;

[0051] Put the test sample into the core holder 7; in order to explore the hydration reaction of the shale fracture after water invasion, set the back pressure pump 18 at a low confining pressure, the confining pressure value is 2MPa, in order to prevent the shale from creeping Influencing factors, start the experiment after the confining pressure is stable for 12 hours, and measure the initial permeability through the gas injection seepage system;

[0052] Water injection stage:

[0053] Close valve 2 and set constant speed and constant pressure pump 4 for constant pressure injection, s...

Embodiment 2

[0055] The first step: experimental preparation stage:

[0056] Cut the shale test sample into a cylinder, perform fracturing, and dry the cut shale test sample at 102°C for 24 hours;

[0057] Obtain the cross-sectional area and length of the dried shale test sample. After drying, coat the side of the cylindrical core with epoxy silica gel. After drying, weigh and prepare for the experiment;

[0058] The temperature of thermostat 6 is set to 45°C;

[0059] Put the rock sample into the three-axis core holder 7; set the back pressure valve 10 to 2MPa, and set the confining pressure to 12MPa for the back pressure pump 18. In order to prevent the factors affecting shale creep, wait for the confining pressure to stabilize for 12 hours After that, the experiment was started, and the initial permeability was measured through the gas injection seepage system;

[0060] The second step: water injection stage:

[0061] Close valve 2 and set constant speed and constant pressure pump 4 ...

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Abstract

Belonging to the technical field of oil and gas exploitation, the invention provides a fractured shale gas-water two-phase flow fracture conductivity evaluation device and method. The device consistsof a seepage system, an injection system, a data acquisition and processing system and a triaxial core holder. Specifically, the seepage system is divided into a water injection stage and a gas flooding stage. The method includes: firstly using the device to determine the initial permeability and initial mass of a shale sample; conducting water injection to the shale sample for water invasion experiment and ending water injection when core effluent water flow becomes stable; adding a dryer, then conducting gas flooding on the shale sample, collecting the gas flooding zone outflow water phase fracturing fluid, and ending gas flooding until a flowmeter measures stable gas output. The device and method provided by the invention measure that the permeability of the shale sample at the water injection stage and gas flooding stage varies with time, and explore the influence of water phase fracturing fluid invasion on shale fracture conductivity and the seepage law. The device and method canaccurately determine the seepage law of shale gas in microfractures, and the operation is simple.

Description

technical field [0001] The invention relates to the technical field of oil and gas exploitation, in particular to a fracture conductivity evaluation device and method for fractured shale gas-water two-phase flow. Background technique [0002] With the continuous increase of energy demand, conventional oil and gas resources can no longer meet industrial needs, and shale gas, as an unconventional energy source, has become a hot spot in global oil and gas exploration and development. Shale reservoirs are characterized by ultra-low porosity and ultra-low permeability, and it is necessary to rely on large-scale horizontal well multi-stage fracturing technology to perform large-scale volume fracturing to obtain high production. Only by ensuring the conductivity of fractures in shale reservoirs can the economic benefits of shale gas development be guaranteed. [0003] At present, the fracturing operation of shale gas reservoirs at home and abroad shows that the flowback rate of fr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0826E21B43/26G01N33/24E21B49/003G01N15/08E21B49/00
Inventor 朱维耀马东旭周子恒韩宏彦宋智勇岳明刘文超
Owner UNIV OF SCI & TECH BEIJING
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