Composite buffering agent for acidification in oil exploitation of low-permeability oil field

A technology of oil extraction and buffering agent, which is applied in the fields of production fluid, earthwork drilling, recycling technology, etc. It can solve the problems of low-permeability reservoirs with insignificant effect, easy to change properties, and difficult to degrade, etc., and achieve excellent corrosion inhibition effect , less environmental pollution, high extraction effect

Active Publication Date: 2021-07-20
西安石油大油气科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in high temperature and strong acid environment, the properties are easy to change, and the effect on low permeability reservoirs is not obvious, and it is not easy to degrade, and it is easy to cause harm to the environment

Method used

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  • Composite buffering agent for acidification in oil exploitation of low-permeability oil field
  • Composite buffering agent for acidification in oil exploitation of low-permeability oil field

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A composite buffer used for acidification of low-permeability oilfield oil extraction, including plant buffer component A, plant buffer component B, modified Mannich base corrosion inhibitor, buffer synergist and organic solvent, Wherein, the raw materials of each component contain 8 parts, 15 parts, 24 parts, 3 parts and 130 parts by weight respectively, and the organic solvent is ethanol with a mass concentration of 75%.

[0028] The raw materials of plant buffer component A are fresh tea seed shells and walnut green peels. The extraction steps of plant buffer component A are: after mixing fresh tea seed shells and walnut green peels in a mass ratio of 3:1, the natural Air-dried, dried to constant weight at 50°C, ground into fine powder and placed in an extractor. The extractor was a commercially available Soxhlet extractor, and an organic solvent 13 times the weight of the plant powder was added at the same time, and the extraction temperature was 85°C. , the extract...

Embodiment 2

[0037] This example is basically the same as Example 1, except that the mass fractions of the raw materials of each component in the composite buffer are different.

[0038] A composite buffer used for acidification of low-permeability oilfield oil extraction, including plant buffer component A, plant buffer component B, modified Mannich base corrosion inhibitor, buffer synergist and organic solvent, Wherein, the raw materials of each component are calculated in parts by weight, and the contents are respectively 10 parts, 15 parts, 26 parts, 3 parts and 128 parts, and the organic solvent is ethanol with a mass concentration of 75%.

[0039] The extraction steps of plant buffer component A are as follows: mix fresh tea seed husks and walnut green husks in a mass ratio of 3:1, then air-dry them naturally, dry them at 55°C to constant weight, and grind them into fine powder Put it into the extractor, add an organic solvent 13.5 times the weight of the plant powder at the same tim...

Embodiment 3

[0041] This example is basically the same as Example 1, except that the mass fractions of the raw materials of each component in the composite buffer are different.

[0042] A composite buffer used for acidification of low-permeability oilfield oil extraction, including plant buffer component A, plant buffer component B, modified Mannich base corrosion inhibitor, buffer synergist and organic solvent, Wherein, the raw materials of each component have contents of 12 parts, 16 parts, 22 parts, 2 parts and 124 parts respectively in parts by weight, and the organic solvent is ethanol with a mass concentration of 75%.

[0043] The extraction steps of plant buffer component A are as follows: mix fresh tea seed husks and walnut green husks in a mass ratio of 3:1, then air-dry them naturally, dry them at 60°C to constant weight, and grind them into fine powder Put it into the extractor, add an organic solvent 14 times the weight of the plant powder at the same time, the extraction temp...

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Abstract

The invention discloses a composite buffering agent for acidification in oil exploitation of a low-permeability oilfield. The buffering agent comprises a plant corrosion inhibitor component A, a plant corrosion inhibitor component B, a modified Mannich base corrosion inhibitor, a corrosion inhibitor synergist and an organic solvent; the raw materials of the plant buffering agent component A are fresh tea seed shells and walnut green husks; the raw material of the plant buffering agent component B is bagasse; the extraction of the plant buffering agent component B comprise S1, bagasse lignin extraction, S2, diethyl ether purification and grading bagasse alkali lignin extraction, S3, methanol purification and grading bagasse alkali lignin extraction, and S4, amination modified bagasse alkali lignin extraction. The composite buffer agent has an excellent corrosion inhibition effect, and the extract of natural green plants is used as one of main components of a slow release agent, so that the components of harmful chemicals in the corrosion inhibitor are reduced, and the corrosion inhibitor is more efficient, has smaller environmental pollution and has certain application value and development potential.

Description

technical field [0001] The invention relates to the technical field of oil extraction acidification, in particular to a composite buffer used for oil extraction acidification in low-permeability oilfields. Background technique [0002] In recent decades, my country's economy has developed rapidly, and the exploitation and utilization of petroleum has played a vital role. In recent years, my country's oil supply has been in short supply, so it is necessary to increase the exploration and development of local oil resources. In the western region of my country, there are rich oil reserves, but most of them are low-permeability reservoirs, which are difficult to exploit, and it is difficult to achieve the scale of economic exploitation by using conventional means. Efficiency enhancement is a more common and reliable method. [0003] Acidizing is to restore or improve the permeability of formation pores and fractures through the dissolution and dissolution of acid liquid on rock...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/74E21B43/27C08H7/00
CPCC09K8/74E21B43/26C08H6/00Y02W30/74
Inventor 张相春邢艳斌张国华赵晨李昂张鑫邢志辉孟高
Owner 西安石油大油气科技有限公司
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