Determination method for permeability of hydrate-containing reservoir in hydrate phase change process

A hydrate-containing, measurement method technology, applied in the direction of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., can solve the problem of inability to measure the permeability of hydrate-containing reservoirs, etc.

Active Publication Date: 2021-05-18
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the permeability of the hydrate-containing reservoir during the phase transi...

Method used

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  • Determination method for permeability of hydrate-containing reservoir in hydrate phase change process
  • Determination method for permeability of hydrate-containing reservoir in hydrate phase change process

Examples

Experimental program
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Effect test

Embodiment 1

[0152]Methane hydrate

[0153]Step 1: Preparation of the reservoir model, washed 100 destination quartz sand and washed 3-5 times with deionized water. After drying, fill it in the hydrate reactor 1, gramilastically, form a densely uniform reservoir model.

[0154]Step 2: Reservoir model applies an effective stress: using the reservoir model in the hydrate reactor plus the reservoir in the hydrate, the effective stress PEFF Set to 2MPa, at this time, the pressure POver 2MPa, where PEFF = POver -Phole Phole For reservoir pores, MPA. At the same time, the size of the upper layer pressure loaded by the displacement sensor 4 is recorded.

[0155]Step 3: Calculate the reservoir porosity: Keep the vacuum pump 0.1MPa to remove the reservoir model for 1-3 hours, the deionized water is injected into the model with 10 ml / min, and then continues to inject 10 minutes after filled with water, record this Cumulative injection volume of deionized water1Cumulative output volume V2Then the pore volume is V...

Embodiment 2

[0168]Ethane hydrate

[0169]Step 1: Preparation of the reservoir model, washed 300 destination quartz sand and washed 3-5 times with deionized water. After drying, fill in the hydrate reaction kettle 1, and consolidate layer by layer, form a uniform reservoir model.

[0170]Step 2: Reservoir model applies an effective stress: using the reservoir model in the hydrate reactor plus the reservoir in the hydrate, the effective stress PEFF Set to 4 MPa, at this time, the upper pressure POver For 4MPa, where PEFF = POver -Phole Phole For reservoir pores, MPA. At the same time, the size of the upper layer pressure loaded by the displacement sensor 4 is recorded.

[0171]Step 3: Calculate the reservoir porosity: Keep the vacuum pump 0.1MPa to remove the reservoir model for 1-3 hours, the deionized water is injected into the model with 10 ml / min, and then continues to inject 10 minutes after filled with water, record this Cumulative injection volume of deionized water1Cumulative output volume V2The...

Embodiment 3

[0184]Methane and ethane hydrate

[0185]Step 1: Preparation of the reservoir model, washed with 500 destination quartz sand and washed 3-5 times with deionized water, and then fill in the hydrate reactor 1 after drying, gramilastically consolidate, forming a densely uniform reservoir model.

[0186]Step 2: Reservoir model applies an effective stress: using the reservoir model in the hydrate reactor plus the reservoir in the hydrate, the effective stress PEFF Set to 3MPa, at this time, the upper pressure POver 3MPa, where PEFF = POver -Phole Phole For reservoir pores, MPA. At the same time, the size of the upper layer pressure loaded by the displacement sensor 4 is recorded.

[0187]Step 3: Calculate the reservoir porosity: Keep the vacuum pump 0.1MPa to remove the reservoir model for 1-3 hours, the deionized water is injected into the model with 10 ml / min, and then continues to inject 10 minutes after filled with water, record this Cumulative injection volume of deionized water1Cumulative...

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Abstract

The invention relates to the field of determination of the permeability of a hydrate-containing reservoir in a hydrate phase change process, and discloses a determination method of the permeability of a hydrate-containing reservoir in the hydrate phase change process. The determination method comprises the following steps of: preparing a reference reservoir and a decomposition reservoir; preparing displacement gas and/or displacement liquid; injecting the displacing gas and/or displacing liquid the reference reservoir and the decomposition reservoir, and determining the horizontal absolute permeability or the vertical absolute permeability of the reference reservoir and the water-phase horizontal effective permeability or the vertical effective permeability of the decomposition reservoir in the bound gas state under different effective stresses; and determining the horizontal gas-water relative permeability or the vertical gas-water relative permeability of the reference reservoir and the decomposition reservoir by using a steady-state method or an unsteady-state method. According to the determination method, the gas-water seepage rule in the natural gas hydrate reservoir in the phase change process can be reflected.

Description

Technical field[0001]The present invention relates to the field of measurement of aqueous reservoir penetration, and more particularly to a method and apparatus for determining the penetration of hydrate reservoir during hydrate phase transition.Background technique[0002]Natural gas hydrates are natural gas and water formed under low temperature high pressure conditions, commonly known as flammable ice, is an unconventional, clean natural gas resources, wide distribution, large resources. It is estimated that buried in the shallow layer (The reserves of natural gas hydrates in <2000M) are equivalent to twice the total amount of conventional fossil fuels, which has great development value, which is of great significance for alleviating future energy crises, optimized energy structure.[0003]Natural gas hydrate seepage is a multiphase, multi-component, non-descending, physical chemical seepage process. The hydrate phase change and the seepage process are extremely complicated: phase...

Claims

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Application Information

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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 李淑霞张宁涛胡志东陈立涛郝永卯孙宝江徐建春王晓璞
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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