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Hydrocarbon reservoir oxygen-sensitivity experimental evaluation method

An evaluation method and technology for oil and gas formations, which are applied in material inspection products, measuring devices, suspensions and porous material analysis, etc., can solve the problem of not including the oxygen sensitivity experimental evaluation method, etc., and achieve short experimental time and simple operation process. , the effect of low economic cost

Active Publication Date: 2019-10-22
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0003] The current reservoir sensitivity evaluation is usually five-sensitivity experiments such as velocity sensitivity, water sensitivity, salt sensitivity, alkali sensitivity, and acid sensitivity. ) implementation, with the development of technology, new stress-sensitive and temperature-sensitive experimental evaluation methods have been added in recent years, but the oxygen-sensitive experimental evaluation method is still not included

Method used

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  • Hydrocarbon reservoir oxygen-sensitivity experimental evaluation method
  • Hydrocarbon reservoir oxygen-sensitivity experimental evaluation method

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Embodiment 1

[0026] In order to verify the reliability of the present invention, the organic-rich shale samples of the Longmaxi Formation were used as experimental samples, and the prepared simulated formation water and oxidative fluid were used to determine the critical Eh value to evaluate the oxygen sensitivity of the shale reservoir. The specific operation steps are as follows:

[0027] (1) Prepare simulated formation water according to the salinity, ion concentration and redox potential of the reservoir fluid;

[0028] (2) Select the core plunger LM-1 to measure its length, diameter, mass, porosity and benchmark gas permeability;

[0029] (3) Create through fractures on the core plunger, remove the surface particles, and measure the basic parameters of the rock sample after fracture creation;

[0030] (4) Put the core plunger into the simulated formation water, seal and soak for 48h;

[0031] (5) Put the core plunger into the core holder, slowly apply a confining pressure of 3-10 MP...

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Abstract

The present invention belongs to the reservoir protection field of the hydrocarbon reservoirs in the petroleum and natural gas industry and provides a hydrocarbon reservoir oxygen-sensitivity experimental evaluation method. A redox potential of a fluid for replacing a rock core plunger is changed, so that the change of the permeability of a hydrocarbon reservoir under the actions of different oxidizing fluids can be measured; relations between the permeability and pore volume and the redox potential are analyzed, so that a critical redox potential and a salinity-sensitivity permeability changerate are determined, and therefore, the oxygen sensitivity of different hydrocarbon reservoirs can be determined. The method of the invention is simple to operate. With the method adopted, the blankof hydrocarbon reservoir sensitivity experimental evaluation at present can be effectively filled. The method is of great significance for the optimization of the fluid properties of the working fluidsystem of a reservoir and the efficient development of a hydrocarbon reservoir.

Description

technical field [0001] The invention relates to the field of reservoir protection of petroleum and natural gas industrial oil and gas reservoirs, in particular to a sensitivity experiment evaluation method in the aspect of rock core analysis during reservoir exploration and development. Background technique [0002] During various operations such as drilling, well completion, and production of oil and gas reservoirs, due to the intrusion of foreign fluids, the physical, chemical or biological reactions of foreign working fluids with sensitive minerals and oil, gas and water are caused, resulting in a decrease in the seepage capacity of oil and gas reservoirs. Changes occur, that is, sensitivity damage occurs. Reservoir sensitivities include velocity sensitivity, water sensitivity, salt sensitivity, alkali sensitivity, and acid sensitivity. In addition, foreign fluids often contain dissolved oxygen and oxidizing additives, which are prone to redox reactions with reducing comp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24G01N15/08
CPCG01N15/08G01N15/088G01N33/24
Inventor 游利军陈杨康毅力豆联栋周洋徐洁明张楠程秋洋
Owner SOUTHWEST PETROLEUM UNIV
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