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Long-term multi-field coupling test device and method for seepage pressure and phase component proportion-controllable rock

A technology of osmotic pressure and experimental equipment, applied in the direction of permeability/surface area analysis, measurement equipment, suspension and porous material analysis, etc., can solve the problem that the two-phase seepage form cannot be realized

Inactive Publication Date: 2015-06-17
INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, limited by the size of rock samples in laboratory experiments, this seepage method cannot realize the two-phase seepage form in the strict sense when the osmotic pressure is high or the permeability is good.
Although many scholars have improved the experiment by first mixing multiphase fluids together and then infiltrating to achieve multiphase seepage, but due to the limitations of technology and experimental conditions, it was not possible to simultaneously control the constant osmotic pressure during the experiment. and a constant multiphase ratio
Moreover, when the predecessors carried out multiphase fluid penetration experiments, they rarely coupled it with creep and temperature.

Method used

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  • Long-term multi-field coupling test device and method for seepage pressure and phase component proportion-controllable rock
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  • Long-term multi-field coupling test device and method for seepage pressure and phase component proportion-controllable rock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Triaxial creep experiment of rock under the condition of single-phase infiltration—taking the triaxial creep experiment of rock under the condition of nitrogen infiltration as an example, firstly, the triaxial pressure chamber, multiphase mixing control device and outlet fluid collection and measurement device are installed as required Connect, prepare the gas required for the sample and experiment, the gas is nitrogen, and close the control valve of the liquid inlet in the connection of the device.

[0039] The specific operation steps are as follows:

[0040] (1) Place the upper and lower ends of the prepared rock sample with permeable plates for penetration and then put them into the triaxial pressure chamber 1 of the triaxial creep test instrument, and use LVDT and circumferential deformation gauge to record the axial deformation during the experiment. Deformation and hoop deformation.

[0041] (2) Open the gas pressure reducing valve 13 and the air inlet 14 valve,...

Embodiment 2

[0057] Triaxial creep experiment of rock under the condition of constant pressure infiltration with constant multiphase fluid composition ratio—taking the triaxial rock creep experiment of mixed fluid of carbon dioxide and salt water under constant pressure infiltration condition as an example, firstly, the triaxial pressure chamber, The multiphase mixing control device and the outlet fluid collection and measurement device are connected as required, the sample is prepared and the gas and liquid required for the experiment are prepared separately. The gas uses carbon dioxide and the liquid uses salt water.

[0058] The specific operation steps are as follows:

[0059] (1) Place the upper and lower ends of the prepared rock sample with permeable plates for penetration and then put them into the triaxial pressure chamber 1 of the triaxial creep test instrument, and use LVDT and circumferential deformation gauge to record the axial deformation during the experiment. Deformation a...

Embodiment 3

[0067] Multiphase displacement experiment under loading conditions—taking the methane experiment of carbon dioxide and nitrogen gas mixture displacement adsorption reservoir as an example, firstly, the triaxial pressure chamber, multiphase mixing control device and outlet fluid collection and measurement device are set as required Connect, prepare the sample, prepare the methane required for the experiment in the gas compression bottle 8, and connect the two spare gas inlets of the mixing container 10 to the gas outlets of the gas metering pumps of carbon dioxide and nitrogen respectively, and the gas outlets of the carbon dioxide and nitrogen The outlets of the gas metering pumps are respectively connected to the gas compression bottles of carbon dioxide and nitrogen, and the gas pressure reducing valves of carbon dioxide and nitrogen are respectively arranged between the outlets of the gas metering pumps of carbon dioxide and nitrogen and the gas compression bottles of carbon ...

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Abstract

The invention discloses a long-term multi-field coupling test device and method for seepage pressure and phase component proportion-controllable rock. The test device comprises a triaxial pressure chamber, a multi-phase fluid mixing control device and an outlet fluid collection and measurement device, wherein the multi-phase fluid mixing control device comprises a gas metering pump, a liquid metering pump, a gas compression bottle, a liquid storage box, a mixing container, a control box and a vacuum pump; a working state of each metering pump is controlled through a level signal of the control box; a constant seepage pressure and a gas-liquid proportion of a mixed fluid are guaranteed. The test method is a test method performed on the basis of the test device; by changing different load conditions, the phase-state components of the mixed fluid, the seepage pressure and the temperature, a heat flow fluid-solid coupling creep test of a rock test piece under the seepage action of different phase-state mixed fluids can be achieved.

Description

technical field [0001] The invention relates to a rock long-term multi-field coupling experimental device and testing method with controllable seepage pressure and phase ratio. Background technique [0002] In engineering construction projects such as petroleum, hydraulic, mining and energy, various multiphase seepage problems are often encountered. During the development of oil and gas fields, multi-phase seepage often occurs in the formation and near the bottom of the well, in which oil-gas, oil-water, gas-water two-phase or three-phase oil, gas, and water flow simultaneously. The storage of carbon dioxide in the saline layer involves the permeation of the two-phase mixed fluid of carbon dioxide and saline water in the formation. During the exploitation of shale gas, there is also the penetration of multiphase mixed fluids such as natural gas and nitrogen. In addition, complex deep rock mass engineering such as energy development and transportation, nuclear waste treatme...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 郑虹冯夏庭胡大伟刘继光高红
Owner INST OF ROCK & SOIL MECHANICS CHINESE ACAD OF SCI
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