Method for pre-processing experimental samples of core flow in oxygen-sensitive oil and gas reservoirs

A technology for sample pretreatment and oil and gas reservoirs. It is used in the preparation and sampling of material inspection products and test samples. It can solve problems affecting the accuracy of experiments, mineral transformation, and changes in the pore structure of released solid particles. Accuracy, the effect of avoiding damage

Inactive Publication Date: 2019-08-16
SOUTHWEST PETROLEUM UNIV
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Problems solved by technology

[0005] The present invention proposes an oxygen-sensitive oil-gas reservoir core flow test sample pretreatment method to solve the problem that in the existing core flow test method, the experimental fluid i

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  • Method for pre-processing experimental samples of core flow in oxygen-sensitive oil and gas reservoirs

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Embodiment Construction

[0020] The technical solution of the present invention will be described in detail below in conjunction with the embodiments.

[0021] The reagents used in the examples are all analytically pure.

[0022] According to the method of the present invention, the following specific example is given for the pretreatment of the core flow test sample of the Longmaxi Formation shale reservoir in southeast Chongqing:

[0023] (1) Select sealed and preserved Longmaxi Formation shale rock samples in southeast Chongqing;

[0024] (2) Using distilled water to prepare simulated formation water containing 5.5% KCl, the measured Eh value is 293.5mV;

[0025] (3) According to the ratio of simulated formation water volume: acetone oxime mass = 100mL: 1.7g, add acetone oxime to the simulated formation water, shake well and prepare simulated formation water containing 1.7% acetone oxime. Avoid too much preparation at one time, which is not conducive to storage;

[0026] (4) vacuumize the simula...

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Abstract

The present invention relates to a method for pre-processing experimental samples of the core flow in oxygen-sensitive oil and gas reservoirs. For the unconventional oil and gas resources formed in the reducing environment, the oxygen-poor environmental deposition products such as organic matters, pyrite, phosphate minerals, and the like are considered, and the concept of oxygen-sensitive oil andgas reservoirs is innovatively proposed; and in the process of oil and gas exploitation, some of the well fluids have certain oxidizing properties, and the influence of oxidizing substances in the well working fluid are not considered. According to the method for pre-processing samples provided by the present invention, the damage of the samples from the oxidizing substances and the influence of the oxidizing substances on the experimental data during the experiment can be avoided, and the accuracy of the experimental result can be ensured.

Description

technical field [0001] The invention relates to the technical field of petroleum and natural gas exploration and development, in particular to a sample pretreatment method for oxygen-sensitive oil-gas reservoir core flow experiments. Background technique [0002] The geological objects of oil and gas exploration and development have gradually shifted to unconventional oil and gas reservoirs such as tight oil and gas reservoirs, shale oil and gas reservoirs, and coalbed methane reservoirs. Unconventional oil and gas resources are accumulations of oil and gas generated by source rocks in reducing environments or accumulated after short-distance migration. These reservoirs are hydrocarbon-generating layers, and their rocks are source rocks rich in organic matter, producing and expelling oil and gas in large quantities. They are usually deposited in the reducing environment of deep water and anoxic, and are called oxygen-sensitive reservoirs. Such reservoir rocks are rich in or...

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Application Information

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IPC IPC(8): G01N1/28G01N15/08G01N33/24E21B49/00
CPCE21B49/00G01N1/28G01N1/286G01N15/08G01N15/082G01N33/24G01N2001/2873
Inventor 游利军周洋康毅力李相臣许成元陈明君程秋洋豆联栋徐洁明
Owner SOUTHWEST PETROLEUM UNIV
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