Simulating device and method for water producing source and pressure-dropping path during coal-rock reservoir discharge and recovery

A simulation device and reservoir technology, which are applied in the field of coal-rock reservoir drainage and production water production sources and pressure drop path simulation devices, and can solve problems such as unclear pressure propagation distance, unknown water production sources, and influence on accurate prediction of gas production. , to achieve the effect of reducing the difficulty of clamping and the difficulty of confining pressure loading

Active Publication Date: 2017-10-24
HENAN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] During the drainage process of coalbed methane wells, it is impossible to control the production of coalbed methane wells under coal reservoirs and surrounding rock combinations with different permeability, water content and reservoir pressure. The source of water is unknown and the distance of pre

Method used

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  • Simulating device and method for water producing source and pressure-dropping path during coal-rock reservoir discharge and recovery
  • Simulating device and method for water producing source and pressure-dropping path during coal-rock reservoir discharge and recovery
  • Simulating device and method for water producing source and pressure-dropping path during coal-rock reservoir discharge and recovery

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Experimental program
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Effect test

Embodiment 1

[0034] Embodiment one: see Figure 1-4 A coal-rock reservoir water production source and pressure drop path simulation device includes a sample clamping component, a formation pressure simulation component, a fluid supply / drainage component, and an information collection and control component.

[0035] The sample holding assembly comprises two groups of holders 16, and the first group of holders 16 includes the No. 1 rock sample holder and the No. 1 coal sample holder arranged below the No. 1 rock sample holder, and the second The set of holders 16 includes No. 2 rock sample holder and No. 2 coal sample holder located below the No. 2 rock sample holder.

[0036] The formation pressure simulation component includes an oil tank 8 , an oil pressure pump 9 , a flow divider 10 , an axial pressure loading cylinder 14 and a confining pressure loading cylinder 163 . One side of the coal sample holder and the rock sample holder is respectively provided with a confining pressure loadin...

Embodiment 2

[0040] Embodiment 2: A method based on coal-rock reservoir drainage production water source and pressure drop path simulation device, comprising the following steps:

[0041] 1) Sample preparation and sealed clamping

[0042] Select the underground coal seam and roof samples of the coal mine, cut and grind them into cube samples of 50 × 50 × 50 mm (or 100 × 100 × 100 mm) (samples with corresponding specifications can be prepared according to the experimental requirements) ((different permeable samples can be selected according to the experimental requirements) rate or the degree of crack development), wrap the sample tightly with a heat shrinkable rubber sleeve, cut 25×25 mm holes on the two top surfaces and two opposite sides, and then place the four diversion pads 165 Paste on the four sides of the sample to form a cylindrical sample and then wrap it with a rubber sleeve. Place the sample in the holder 16, clamp the sealing sleeve 15 on the two bottom surfaces of the sample,...

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Abstract

The invention discloses a simulating device and method for a water producing source and a pressure-dropping path during coal-rock reservoir discharge and recovery. The simulating device comprises a sample clamping assembly, a stratum pressure simulating assembly, a fluid supplying/discharging assembly and an information acquisition and control assembly. The sample clamping assembly comprises at least one clamping device, and each clamping device comprises a coal sample clamping device body and a rock sample clamping device body arranged above the coal sample clamping device body. The stratum pressure simulating assembly comprises an oil tank, an oil pressure pump, a flow divider, an axial pressure loading cylinder and a confining pressure loading cylinder. The fluid supplying/discharging assembly comprises a fluid storage tank, a booster pump, a quantitative fluid storage tank and a simulating shaft. Through the simulating device and method, the developing characteristic, the permeability and the water-bearing property of different fractures and flowing of fluids in and between rock stratums in the coal-rock reservoir discharge and recovery process in a combination mode can be simulated, and scientific bases are provided for judgment of the water producing source and the pressure transmission path under the corresponding geological condition.

Description

technical field [0001] The invention belongs to the technical field of coal-rock testing devices, and in particular relates to a coal-rock reservoir drainage production water source and pressure drop path simulation device and method. Background technique [0002] When developing coalbed methane on the ground, the gas adsorbed in the coal reservoir is desorbed mainly through the method of "drainage-depressurization". Therefore, only when the reservoir pressure drops below the critical desorption pressure, can the coalbed methane desorb-migrate-produce out. The drainage of coalbed methane wells is carried out in three-dimensional space. The lithology, permeability, water content, thickness, etc. of coal seams and surrounding rocks cause differences in water production sources, liquid supply capabilities, and effective pressure propagation distances in coal seams during drainage and production of coalbed methane wells. The difference will ultimately affect the gas production ...

Claims

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Application Information

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IPC IPC(8): E21B49/00E21B47/10
CPCE21B47/10E21B49/00
Inventor 倪小明赵永超金毅林俊峰张洲
Owner HENAN POLYTECHNIC UNIV
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