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A kind of high-strength and high-temperature acid pressure temporary plugging agent and its preparation method and application

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 agents, achieve cheap raw materials, good dispersibility, and improve solubility Effect

Active Publication Date: 2022-07-01
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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  • A kind of high-strength and high-temperature acid pressure temporary plugging agent and its preparation method and application
  • A kind of high-strength and high-temperature acid pressure temporary plugging agent and its preparation method and application
  • A kind of high-strength and high-temperature acid pressure temporary plugging agent and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

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

[0049] (1) Mixing: weigh 300 g of polyvinyl alcohol, 250 g of polylactic acid, 0.2 g of neopentyl glycol, 0.1 g of pentaerythritol, 0.2 g of triethanolamine, inorganic salt (prepared according to the ratio in Table 1), 1.0 g of chitosan 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: the mixture obtained in step (1) is put into SJZS-10B miniature twin-screw extruder for melting and plasticizing, and the melted and plasticized material is extruded to form extruded bars, and the melt extrusion temperature is 180 ℃ -190℃, the melt extrusion time is 50-60s; the extruded strip is cooled t...

Embodiment 2

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

[0059] (1) Mixing: take by weighing polyvinyl alcohol 300g, polylactic acid 250g, composite plasticizer (prepared according to the ratio 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, mixed uniformly, dried at 90°C for 2h to remove residual trace moisture in the material, and then cooled in a desiccator The mixture was obtained at room temperature; steps (2) and (3) were the same as those 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 properties of temporary plugging agents

[0061] ...

Embodiment 3

[0063] Example 3 Preparation of high-strength and high-temperature acid pressure temporary plugging agents with different mesh numbers

[0064] (1) Mixing: weigh 200 g of polyvinyl alcohol, 400 g of polylactic acid, 0.1 g of neopentyl glycol, 0.5 g of pentaerythritol, 0.2 g of triethanolamine, inorganic salt (prepared according to the proportion in Table 3), 0.5 g of chitosan g. 0.2g of silane coupling agent KH560, 2.0g of starch binder and 0.2g of antioxidant 168, mixed uniformly, 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 a mixture;

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

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Abstract

The invention relates to the technical field of oil field water plugging agents, and discloses a high-strength and high-temperature acid pressure temporary plugging agent and a preparation method and application thereof. The high-strength and high-temperature acid pressure temporary plugging agent includes the following components in parts by weight: 20-45 parts of polyvinyl alcohol; 15-40 parts of polylactic acid; 1-36 parts of inorganic salts; 0.02-0.16 parts of composite plasticizer; silane coupling 0.02-0.3 part of the crosslinking agent; 0.02-0.2 part of the cross-linking agent; 0.1-1 part of the auxiliary modifier. The high-strength and high-temperature acid pressure temporary plugging agent has high pressure bearing strength, controllable dissolution time, good dispersibility in the dissolution process, high temperature resistance, good compatibility, cheap and easy-to-obtain raw materials, simple preparation process, and convenient grinding.

Description

technical field [0001] The invention relates to the technical field of oil field water plugging agents, in particular to a high-strength and high-temperature acid pressure temporary plugging agent and a preparation method and application thereof. Background technique [0002] With a large number of mature oil fields entering 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 unproduced reservoirs or oil layers with a low degree of production to be further exploited. 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 the workover fluid leaks into the formation. It has caused serious p...

Claims

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Application Information

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Patent Type & Authority Patents(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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