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Experimental Evaluation Method for Oxygen Sensitivity of Oil and Gas Reservoirs

An evaluation method and technology for oil and gas layers, which are applied in material inspection products, suspension and porous material analysis, soil material testing, etc., can solve the problems of not including the evaluation method of oxygen sensitivity experiment, and achieve short experimental time and operation technology. Simple, economical effect

Active Publication Date: 2021-11-26
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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  • Experimental Evaluation Method for Oxygen Sensitivity of Oil and Gas Reservoirs
  • Experimental Evaluation Method for Oxygen Sensitivity of Oil and Gas Reservoirs
  • Experimental Evaluation Method for Oxygen Sensitivity of Oil and Gas Reservoirs

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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 invention relates to the field of reservoir protection of oil and gas layers in the petroleum and natural gas industry, and provides an experimental evaluation method for oxygen sensitivity of oil and gas layers. By changing the redox potential of the fluid that displaces the core plug, measure the permeability change of the oil and gas layer under the action of different oxidizing fluids, and determine the critical redox potential by analyzing the relationship between permeability, pore volume and redox potential The oxygen sensitivity of different oil and gas reservoirs can be clarified through the change rate of salt-sensitive permeability. The invention is easy to operate, can effectively fill in the gaps in the current experimental evaluation of the sensitivity of oil and gas layers, and has great significance for the optimization of the fluid properties of the reservoir working fluid system and the efficient development of oil and gas layers.

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 Patents(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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