High-temperature-resistant degradable temporary plugging liquid and preparation method thereof

A technology of temporary plugging fluid and high temperature resistance, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as application limitations, poor temperature resistance of chemical temporary plugging agents, and inability to use mechanical layered acidification, etc. The liquid is uniform, the construction risk is small, and the suspension ability is good.

Inactive Publication Date: 2021-02-02
BETTER OILFIELD TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For abnormally high-pressure ultra-deep gas reservoirs, the formation heterogeneity is extremely strong, and there are many and thin small layers, so mechanical stratification and acidification cannot be used. Conventional chemical temporary plugging agents have poor temperature resistance, and their application is severely limited. The heterogeneity of the acid solution cannot reach the low-permeability layer, so the reserves in the low-permeability layer cannot be exploited

Method used

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  • High-temperature-resistant degradable temporary plugging liquid and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Such as figure 1 As shown, the temporary plugging fluid includes at least the following components and each component is composed of the following percentages: thickener 0.4%, dispersant 0.25%, temperature stabilizer 0.1%, temporary plugging particles 15%, degradable fiber 1% , 0.25% drainage aid, 0.2% defoamer, 0.15% fungicide, 82.65% water.

[0028] A preparation method of a high-temperature-resistant and degradable temporary plugging fluid, comprising the steps above:

[0029] a1. At room temperature, add the formulated amount of thickener to the water, stir evenly, and the stirring speed is 60-200 revolutions per minute. After the thickener is completely swollen, add the formulated amount of dispersant, defoamer, temperature Stabilizer, drainage aid, stir evenly to obtain base liquid;

[0030] a2. Add the formula amount of degradable fiber into the base liquid, after stirring evenly, the stirring speed is 60-200 revolutions per minute, add the formula amount of te...

Embodiment 2

[0044] Such as figure 1 As shown, the temporary plugging fluid includes at least the following components and each component is composed of the following percentages: thickener 0.1%, dispersant 0.05%, temperature stabilizer 0.02%, temporary plugging particles 5%, degradable fiber 0.5% , drainage aid 0.1%, defoamer 0.1%, fungicide 0.05%, water 94.08%.

[0045] Its proportioning method is identical with embodiment 1.

Embodiment 3

[0047] Such as figure 1 As shown, the temporary plugging fluid includes at least the following components and each component is composed of the following percentages: thickener 0.8%, dispersant 0.5%, temperature stabilizer 0.2%, temporary plugging particles 25%, degradable fiber 1.5% , 0.5% drainage aid, 0.3% defoamer, 0.2% fungicide, 71% water.

[0048] Its proportioning method is identical with embodiment 1.

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Abstract

The invention provides a high-temperature-resistant degradable temporary plugging liquid. The temporary plugging liquid at least comprises the following components in percentage by weight: 0.1-0.8% ofa thickening agent, 0.05-0.5% of a dispersing agent, 0.02-0.2% of a temperature stabilizer, 5-25% of temporary plugging particles, 0.5-1.5% of degradable fibers, 0.1-0.5% of a cleanup additive, 0.1-0.3% of a defoaming agent, 0.05-0.2% of a bactericide and the balance of water. The temporary plugging particles and the degradable fibers have a good plugging effect and can be automatically degradedafter construction is finished, the degradation rate is larger than 95%, reservoir damage is small, agents can be added according to site construction requirements to control the degradation time, thetemporary plugging particles of multiple particle sizesare combined and matched, the temporary plugging particles are used in cooperation with the degradable fibers, the pressure bearing capacity ofa filter cake can reach 80 MPa, and meanwhile, a temporary plugging agent adopted by the temporary plugging liquid is non-toxic, green and environment-friendly.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a high-temperature-resistant degradable temporary plugging fluid and a preparation method thereof. Background technique [0002] At present, most of the development wells are segmented into sections of about 100 meters each, which is basically evenly segmented, and the fracturing stimulation is lack of pertinence. Researches at home and abroad have shown that more than 80% of the productivity of oil and gas wells comes from about 30% of the intervals (SPE144326), and it is estimated that about half of the intervals have no production contribution. [0003] For abnormally high-pressure ultra-deep gas reservoirs, the formation heterogeneity is extremely strong, and there are many and thin small layers, so mechanical stratification and acidification cannot be used. Conventional chemical temporary plugging agents have poor temperature resistance, and their application is s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/68
CPCC09K8/5086C09K8/5083C09K8/68C09K2208/08
Inventor 陈洋冯乐蒙何进朱金南周长清杨飞王俊杰贾伟东蒲杰
Owner BETTER OILFIELD TECH
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