A method for evaluating the permeability of chemical absorbents

An evaluation method and a technology of permeability performance, which is applied in the field of evaluation of the permeability performance of chemical absorbents, can solve problems such as lack of methods, and achieve the effect of easy comparison and quantification, and convenient testing

Active Publication Date: 2018-08-14
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For the indoor evaluation of permeants and other chemical agents used in low-permeability reservoirs, there is still a lack of corresponding methods, especially quantitative methods for characterizing and evaluating the permeability of chemical agents in porous media

Method used

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  • A method for evaluating the permeability of chemical absorbents
  • A method for evaluating the permeability of chemical absorbents
  • A method for evaluating the permeability of chemical absorbents

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This embodiment provides a method for evaluating the permeability of chemical imbibants, mainly by measuring the permeability values ​​of various chemical imbibants and formation simulated water, and comparing and judging the permeability of chemical imbibants in the target oil reservoir. The definition formula of penetration force: penetration force (Fp) = capillary lift coefficient (Sc) × penetration velocity (Sp), to measure the capillary lift coefficient and penetration velocity value of the chemical imbibant, the specific test experiment includes the following steps:

[0053] A. Penetration speed (Sp) test:

[0054] (1) Oil sand selection and preparation:

[0055] According to the reservoir permeability Ka of the target oil reservoir, select quartz sand or natural sand with a corresponding particle size range, and mix crude oil or simulated oil of the target oil reservoir with the quartz sand or washed natural sand to make oil sand;

[0056] When Ka>800mD, choose ...

Embodiment 2

[0114] This example provides a method for evaluating the permeability of a chemical absorbent, the steps of which are the same as in Example 1.

[0115] The 5 groups of experiments in this embodiment are to simulate the reservoir conditions of YT oilfield. The experiment uses fine oil sand (100-160 mesh) oil sand, and the experimental temperature is 64 ° C. This oilfield belongs to the ultra-low permeability reservoir (Ka=1.0-10mD ). The oil sand preparation and capillary treatment are the same as in Example 1, the inner surface of the capillary is treated to an oil-wet state, and the testing method is the same as in Example 1. The test method for the penetration rate of the graduated tube is the same as in Example 1, and the experimental results are shown in Table 6, Table 7, and Table 8.

[0116] See Table 6 for the capillary test, Table 7 for the calibration tube penetration velocity test, and Table 8 for the calculation results of the penetration force.

[0117] Table 6 ...

Embodiment 3

[0125] This example optimizes the parameter selection of the capillary lift coefficient in the method for evaluating the permeability of the chemical absorbent of the present application.

[0126] This example provides the capillary lift coefficients under the conditions of two kinds of formation simulated water and 10 kinds of chemical imbibants using capillary tubes with two inner diameters (0.3mm and 0.5mm), the same wettability (oil wet), and the same conditions of crude oil and water Experiment, the experimental results are shown in Table 9 and Table 10.

[0127] Table 9

[0128]

[0129]

[0130] Table 10

[0131]

[0132] From the experimental results in Table 9 and Table 10, it can be seen that when the same agent or water is tested in capillary tubes with the same inner diameter, when the imbibition volume in the liquid-filled small test tube is different (3mL, 4mL, 5mL), the capillary lift coefficient is also different. The trend is that the capillary lift...

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Abstract

The invention provides a method for evaluating the permeating performance of a chemical imbibition agent. According to the evaluation method, the elevating coefficient Sc and permeation speed Sp of a capillary can be measured, thus the permeation force Fp can be calculate according to a formula: Fp=Sc*Sp; the performance of a chemical imbibition agent can be evaluated through a ratio (R) of the permeation force Fp of a chemical imbibition agent to a simulated water permeation force, and if the R is greater than 1.0, the chemical imbibition agent has a good imbibition effect. The method can be used to quantitatively evaluate the permeating performance of a chemical imbibition agent for low permeability reservoir. The method has the advantages that the indoor tests become convenient and fast, the comparison and quantitation become more convenient; the permeating performance and diffusion property of different chemical imbibition agents can be effectively compared; corresponding oil sand and capillary that are similar to oil reservoirs are used to simulate the oil reservoirs, at the same time, the experiment temperature is identical with the temperature of stratum, and thus the experiment is closer to the actual state.

Description

technical field [0001] The invention belongs to the technical field of petroleum exploitation, and relates to a method for evaluating the permeability of a chemical absorbent. Background technique [0002] The main oil and gas bearing areas in China are dominated by continental deposits, with strong reservoir heterogeneity and abundant low permeability oil and gas resources. Low-permeability resources have become the mainstay of domestic oil and gas production stability and increase. According to the results of China's third oil and gas resource evaluation, the national low-permeability prospect resources are 537×10 8 t, accounting for 49% of the total national oil prospect resources. With the increasing scarcity of oil resources, low-permeability oil fields will play an increasingly important role in future oil and gas production. The proportion of crude oil production in my country's low-permeability reservoirs has been increasing year by year, accounting for 39.4%, 40....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
CPCG01N15/08G01N2015/0813
Inventor 张翼蔡红岩江敏孙蕴陈海汇
Owner PETROCHINA CO LTD
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