Oil field microcapsule non-acid self-generating thermal blocking remover and preparation method thereof

A technology of microcapsules and plugging remover, which is applied in the field of oil field microcapsule non-acid autogenous heat plugging remover and its preparation, can solve the problems of safety hazards, reaction heat release, etc., and achieve increased pressure, increased crude oil production, social benefits and Significant environmental benefits

Active Publication Date: 2020-07-10
天津克睿特维科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In actual operation, in the process of transportation and storage of reactants, if the operation or storage is improper, there will be a risk of exothermic reaction, and there will be certain safety hazards

Method used

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  • Oil field microcapsule non-acid self-generating thermal blocking remover and preparation method thereof
  • Oil field microcapsule non-acid self-generating thermal blocking remover and preparation method thereof
  • Oil field microcapsule non-acid self-generating thermal blocking remover and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0047] The preparation method of the above-mentioned oilfield microcapsule non-acid self-generated heat plugging remover is specifically:

[0048] The water-soluble microcapsule plugging remover KR-100A and the water-soluble microcapsule plugging remover KR-100B are uniformly mixed according to the mass ratio of 0.9-2.1:1 to obtain the oilfield microcapsule non-acid autogenous heat plugging remover.

[0049] The specific steps for using the above-mentioned oilfield microcapsule non-acid self-generated heat plugging remover are as follows:

[0050] Use clean water to test the pressure of the extrusion process and the Christmas tree to ensure that there is no puncture or leakage, and the extrusion construction will be carried out after passing the test;

[0051]Close the blowout preventer, test squeeze the perforation section, and determine the water absorption of the oil layer;

[0052] Disperse the mixture of water-soluble microcapsule deblocking agent KR-100A and water-solub...

specific Embodiment

[0061] Preparation of water-soluble microcapsule deblocking agent KR-100A: Add 300 parts of capsule core material ammonium chloride and 100 parts of potassium chloride to 1000 parts of water to dissolve to saturation. After filtering, add the saturated aqueous solution into a stainless steel reaction kettle, add sulfuric acid Adjust the pH to 2, heat the reactor to 50°C, add 200 parts of polyvinyl alcohol with a degree of polymerization of 3000 and a degree of alcoholysis of 80mol1% and stir evenly, add 40 parts of dimethyl sulfoxide and 10 parts of solid paraffin, and place in a high-speed mixer , heat up to 120°C, react for 2.5 hours, cool to room temperature, filter, wash with absolute ethanol, and dry to obtain the water-soluble microcapsule unblocking agent KR-100A, which has a particle size of 0.1-0.9mm and a release rate > 60%, the effective content can reach 39.23%, and the embedding rate is 86.77%.

[0062] Table 1 The influence of solid paraffin on KR-100A slow-relea...

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Abstract

The invention relates to an oil field microcapsule non-acid self-generating thermal blocking remover and a preparation method thereof. The thermal blocking remover comprises a water-soluble microcapsule blocking remover KR-100A and a water-soluble microcapsule blocking remover KR-100B, and the mass ratio of the water-soluble microcapsule blocking remover KR-100A to the water-soluble microcapsule blocking remover KR-100B is (0.9-2.1): 1, wherein the water-soluble microcapsule blocking remover KR-100A is prepared from ammonium chloride, potassium chloride, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide; the water-soluble microcapsule blocking remover KR-100B is prepared from sodium nitrite, sodium nitrate, EDTA-2NA salt, solid paraffin, polyvinyl alcohol and dimethyl sulfoxide. Contents in the capsule core break through the capsule wall under proper conditions, react and release heat under the initiation of an external catalyst, generate gas and cooperate with other assistantsoutside the capsule wall to play a role in cleaning and unblocking.

Description

technical field [0001] The invention relates to the technical field of oil well blockage cleaning, in particular to an oilfield microcapsule non-acid self-generating heat blocking agent and a preparation method thereof. Background technique [0002] At present, the main reasons for oil well blockage are as follows: [0003] 1. Formation damage caused by organic matter deposition: [0004] Emulsion blockage caused by the action of additives used in oil well operations and oil and water; [0005] Changes in temperature and pressure during production and transportation lead to the precipitation of wax, colloid, asphalt, etc. in crude oil; [0006] Natural gas, CO 2 After the gas material overflows, the viscosity of crude oil increases, causing blockage. [0007] 2. Inorganic fouling causes near-well blockage of oil wells: [0008] Changes in temperature and pressure lead to the precipitation of produced water and salt; [0009] Incompatibility between injected water and f...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/536C09K8/524C09K8/528
CPCC09K8/536C09K8/524C09K8/528Y02P90/70
Inventor 高建明杨文超史云梅孙波
Owner 天津克睿特维科技发展有限公司
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