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High-strength high-temperature acid fracturing temporary plugging agent and preparation method and application thereof

A high-strength, temporary plugging agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of low pressure bearing strength of temporary plugging agent

Active Publication Date: 2021-09-10
CHENGDU LEARN PRACTICES TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The present invention intends to provide a high-strength high-temperature acid pressure temporary plugging agent to solve the problem of low pressure-bearing strength of the above-mentioned temporary plugging agent

Method used

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  • High-strength high-temperature acid fracturing temporary plugging agent and preparation method and application thereof
  • High-strength high-temperature acid fracturing temporary plugging agent and preparation method and application thereof
  • High-strength high-temperature acid fracturing temporary plugging agent and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] Example 1 Preparation of high-strength high-temperature acid fracturing temporary plugging agent containing inorganic salts in different proportions

[0049] (1) Mixing: Weigh 300g of polyvinyl alcohol, 250g of polylactic acid, 0.2g of neopentyl glycol, 0.1g of pentaerythritol, 0.2g of triethanolamine, inorganic salt (prepared according to the proportioning in Table 1), chitosan 1.0 g, 0.5g of silane coupling agent KH550, 5.0g of starch binder and 0.5g of antioxidant 1010, mixed uniformly, dried at 80°C for 3h to remove residual trace moisture in the material, and then cooled to room temperature in a desiccator to obtain mixture;

[0050] (2) Extrusion granulation: Put the mixture obtained in step (1) into the SJZS-10B miniature twin-screw extruder for melting and plasticization, extrude the melted and plasticized material to form an extruded strip, and the temperature for melting and extrusion is 180 -190°C, the melt extrusion time is 50-60s; the extruded strips are c...

Embodiment 2

[0058] Example 2 Preparation of high-strength, high-temperature acid fracturing temporary plugging agent containing composite plasticizers in different proportions

[0059] (1) Mixing materials: take polyvinyl alcohol 300g, polylactic acid 250g, composite plasticizer (prepared by the proportioning in Table 2), sodium chloride 50g, potassium chloride 50g, sodium carbonate 20g, calcium carbonate 60g, Chitosan 0.2g, silane coupling agent KH550 0.5g, starch binder 5.0g and antioxidant 1010 0.5g, mix evenly, dry at 90°C for 2h, remove residual trace moisture in the material, then cool in a desiccator To room temperature to obtain the mixture; Steps (2), (3) are the same as in Example 1. And the processing performance of the prepared temporary plugging agent was tested. The results are shown in Table 2.

[0060] Table 2 Effects of different proportions of composite plasticizers on the processing performance of temporary plugging agents

[0061]

[0062] It can be seen from the...

Embodiment 3

[0063] Example 3 Preparation of high-strength high-temperature acid fracturing temporary plugging agents with different meshes

[0064] (1) Mixing: Weigh 200g of polyvinyl alcohol, 400g of polylactic acid, 0.1g of neopentyl glycol, 0.5g of pentaerythritol, 0.2g of triethanolamine, inorganic salt (prepared according to the proportioning in Table 3), chitosan 0.5 g. 0.2g of silane coupling agent KH560, 2.0g of starch binder and 0.2g of antioxidant 168, mixed evenly, dried at 85°C for 2.5h to remove residual trace moisture in the material, and then cooled to room temperature in a desiccator get the mixture;

[0065] (2) Extrusion granulation: put the mixture obtained in step (1) into the SJZS-10B miniature twin-screw extruder for melting and plasticization, and extrude the melted and plasticized material to form an extruded strip, and the temperature for melting and extrusion is 180- 220°C; melt extrusion time is 100-110S, the extruded strips are cooled to room temperature by SF...

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Abstract

The invention relates to the technical field of oil field water plugging agents, and discloses a high-strength high-temperature acid fracturing temporary plugging agent and a preparation method and application thereof. The high-strength high-temperature acid fracturing temporary plugging agent comprises the following components in parts by weight: 20-45 parts of polyvinyl alcohol; 15-40 parts of polylactic acid; 1-36 parts of an inorganic salt; 0.02-0.16 part of a composite plasticizer; 0.02-0.3 part of a silane coupling agent; 0.02-0.2 part of a cross-linking agent; and 0.1-1 part of an auxiliary modifier. The high-strength high-temperature acid fracturing temporary plugging agent is high in bearing strength; the dissolving time is controllable; the dispersibility in the dissolving process is good; high temperature resistance is realized; the compatibility is good; the raw materials are cheap and easily available; and the preparation process is simple and convenient for grinding.

Description

technical field [0001] The invention relates to the technical field of oilfield water shutoff agents, in particular to a high-strength, high-temperature acid-pressing temporary plugging agent and its preparation method and application. Background technique [0002] As a large number of mature oil fields gradually enter the dry production period, only 25-35% of the underground crude oil can be obtained even after water injection development, and there are still a large number of undeveloped reservoirs or oil layers with a low degree of production to be further developed. Conventional water injection mining not only has low recovery efficiency, but also with the long-term continuous development of water injection oilfields, the comprehensive water content of the oilfield will rise in the middle and late stages of development, and workover, well killing, sand washing and other operations are frequent, and workover fluid leaks into the formation Pollution, as well as serious pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/88
CPCC09K8/512C09K8/887
Inventor 任山郭建春冷长松张绍桃苟波刘斌王混马应娴曾韦路千里覃明刁素唐朝钧雷欣蒋尧
Owner CHENGDU LEARN PRACTICES TECH CO LTD
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