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Low-water-permeability gas reservoir failure development high-temperature high-pressure physical simulation experiment device and method

A depletion development, high temperature and high pressure technology, applied in measurement devices, undisturbed core extraction devices, and production fluids, etc., can solve problems such as failure to meet the ultra-high pressure flooding and depletion experiments of water intrusion gas reservoirs in low permeability areas, and achieve the elimination of rock compression effects. Effects with stress-sensitive effects

Active Publication Date: 2020-04-17
SOUTHWEST PETROLEUM UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a high-temperature and high-pressure physical simulation experiment device and 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 realize one-time The purpose of completing the full-diameter core ultra-high pressure depletion experiment for water-invaded gas reservoirs in low-permeability areas

Method used

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  • Low-water-permeability gas reservoir failure development high-temperature high-pressure physical simulation experiment device and method
  • Low-water-permeability gas reservoir failure development high-temperature high-pressure physical simulation experiment device and method

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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 low-water-permeability gas reservoir failure development high-temperature high-pressure physical simulation experiment device and method. The device comprises a core holder and further comprises a displacement pump, a three-way valve and a back-pressure valve; a gas intermediate container and a water intermediate container are connected between the displacement pump and one of connectors of the three-way valve in parallel; the other two connectors of the three-way valve are connected with a vacuum pump and one end of the core holder correspondingly; the other end of the core holder is connected with the back-pressure valve; and the device further comprises confining pressure pipes connected at the two ends of the core holder in parallel, and a back pressure pipe connected with the back-pressure valve. The purpose of the invention is to provide the low-water-permeability gas reservoir failure development high-temperature high-pressure physical simulation experiment device and method so that the problem that in the prior art, the requirements of an ultrahigh-pressure displacement failure experiment for a low-water-permeability gas reservoir cannot be met canbe solved, and the purpose that the full-diameter core ultrahigh-pressure failure experiment for the low-water-permeability gas reservoir is completed in one step is achieved.

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 device and method for 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 exhaustion 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 siz...

Claims

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Application Information

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Patent Type & Authority Applications(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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