High-temperature and high-pressure physical simulation experiment method for depletion development of low-permeability water-invaded gas reservoirs

A depletion development, high temperature and high pressure technology, applied in the direction of mining fluids, earth drilling, material inspection products, etc., can solve the problems that cannot meet the ultra-high pressure displacement depletion experiments of water-invaded gas reservoirs in low-permeability areas, and achieve the elimination of rock compression effect Effects with Stress Sensitive Effects

Active Publication Date: 2022-02-01
SOUTHWEST PETROLEUM UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0006] The purpose of the present invention is to provide a high-temperature and high-pressure physical simulation experiment method for the depletion of low-permeability water-invaded gas reservoirs to solve the problem in the prior art that cannot satisfy the ultra-high pressure displacement and depletion experiments of water-invaded gas reservoirs in low-permeability areas, and to achieve one-time completion of the depletion experiment. The purpose of ultra-high pressure depletion experiment on full-diameter cores in water-invaded gas reservoirs in low-permeability areas

Method used

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  • High-temperature and high-pressure physical simulation experiment method for depletion development of low-permeability water-invaded gas reservoirs
  • High-temperature and high-pressure physical simulation experiment method for depletion development of low-permeability water-invaded gas reservoirs
  • High-temperature and high-pressure physical simulation experiment method for depletion development of low-permeability water-invaded gas reservoirs

Examples

Experimental program
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Embodiment 1

[0041] Such as figure 1The shown high-temperature and high-pressure physical simulation experiment device for the depletion development of low-permeability water-invaded gas reservoirs includes a core holder 6, and also includes a displacement pump 1, a three-way valve 2, and a back pressure valve 5. The displacement pump 1 and the three-way A gas intermediate container 3 and a water body intermediate container 4 are connected in parallel between one interface of the valve 2; the other two interfaces of the three-way valve 2 are respectively connected with the vacuum pump 7 and the rock core holder 6, and the other two ports of the rock core holder 6 One end is connected to the back pressure valve 5; it also includes confining pressure pipes 8 connected in parallel at both ends of the core holder 6, and back pressure pipes 9 connected with the back pressure valve 5.

[0042] Preferably, the confining pressure pipe 8 is connected to the side of the back pressure valve 5 close t...

Embodiment 2

[0044] This example is based on the experimental device as in Example 1, using actual reservoir cores, under the conditions of normal temperature and confining pressure of 126 MPa, the full-diameter core depletion recovery experiment of the reservoir cores is carried out.

[0045] 1. Experimental conditions

[0046] 1. Experimental temperature: room temperature (20°C);

[0047] 2. Experimental pressure: the confining pressure simulates the overburden pressure of 126MPa, the back pressure simulates the formation pressure from 76MPa to 5MPa (abandoned pressure), and the internal pressure point is selected to change by 2MPa;

[0048] 3. Experimental gas: N 2 ;

[0049] 4. Experimental formation water: Prepare the experimental formation water according to Table 1.

[0050] Table 1 Formation water composition and content table used in experiments

[0051] Bicarbonate mg / L Chloride ionmg / L Sulfate mg / L Calcium ion mg / L Magnesium ion mg / L 24.97 9817.22 97....

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Abstract

The invention discloses a high-temperature and high-pressure physical simulation experiment method for the depletion of low-permeability water-invaded gas reservoirs. The formation core is taken, put into a core holder, and vacuumized; the valve connecting the intermediate container of the water body with the displacement pump and the three-way valve is opened, and the The displacement pump keeps the pressure of the water intermediate container constant at the displacement pressure A; open the valve between the three-way valve and the core holder, the displacement pump drives the liquid in the water intermediate container to the core, and simultaneously raises the confining pressure to B , B>A; obtain the pore volume of the core; gradually establish the initial experimental pressure on the core in the order of confining pressure, back pressure, and core pressure through the intermediate container of the water body, and make the core saturated with gas; pressurize the intermediate container of the water body to the pressure of the core to simulate the formation Water body, and connect the water body intermediate container with the gas-saturated rock core; gradually reduce the back pressure to the failure pressure through the back pressure valve. By adopting this scheme, the purpose of completing the full-diameter core ultra-high pressure depletion experiment of water-invaded gas reservoirs in low-permeability areas can be achieved at one time.

Description

technical field [0001] The invention relates to the field of low-permeability gas reservoirs, in particular to a high-temperature and high-pressure physical simulation experiment method for the depletion development of low-permeability water-invaded gas reservoirs. Background technique [0002] For oil and gas reservoirs with conventional pressure, the depletion experiment is to fill the intermediate container with dry gas at room temperature, pressurize it above the formation pressure, control the outlet flow rate for depletion production, and then regularly record the pressure difference, production time, instantaneous production, Cumulative production, etc. After the design pressure drops to the waste pressure (5MPa), close the outlet, record the pressure recovery, and complete the depletion experiments at different production speeds in sequence. [0003] However, for water-invaded gas reservoirs in low-permeability areas, the recovery rate is affected by the size of the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B25/00E21B43/20G01N15/08G01N33/24
CPCE21B25/00E21B43/20G01N33/24G01N15/0826
Inventor 胡义升王哲郭平汪周华杨龙李安琪
Owner SOUTHWEST PETROLEUM UNIV
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