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A kind of chelating agent for reservoir acidification augmentation injection construction and its preparation method and application

A chelating agent, reservoir technology, chelating agent and its preparation used in reservoir acidification construction, chelating agent and its preparation field, can solve the problems of limited site construction conditions, high equipment transportation costs, complex construction technology, etc., to achieve The effect of reducing secondary precipitation, simplifying construction technology, and reducing surface and interfacial tension

Active Publication Date: 2021-01-29
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the current complex construction technology, limited site construction conditions, high equipment transportation costs and high labor intensity

Method used

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  • A kind of chelating agent for reservoir acidification augmentation injection construction and its preparation method and application
  • A kind of chelating agent for reservoir acidification augmentation injection construction and its preparation method and application
  • A kind of chelating agent for reservoir acidification augmentation injection construction and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] This embodiment provides a chelating agent for reservoir acidification and augmentation injection construction. The raw material composition of the reservoir acidification augmentation injection construction chelating agent includes: 15% methanesulfonic acid, 18% methanol, 12% poly Aspartic acid, 12% epoxysuccinic acid, 8% sodium cetyl sulfonate, 10% cetyltrimethylammonium bromide and the balance water.

[0029] This embodiment also provides a preparation method for the above-mentioned chelating agent for reservoir acidification augmentation injection construction, which specifically includes the following steps:

[0030] At 15°C-25°C, add polyaspartic acid, epoxysuccinic acid, sodium cetylsulfonate, cetyltrimethylammonium bromide, and water to methanesulfonic acid in sequence, and stir evenly; Methanol is added and stirred uniformly to obtain a chelating agent for reservoir acidification augmentation injection construction.

[0031] The precipitation inhibition abilit...

Embodiment 2

[0057] This embodiment provides a kind of chelating agent for reservoir acidification and augmentation injection construction. The raw material composition of the reservoir acidification augmentation injection construction chelating agent includes: 18% methanesulfonic acid, 15% methanol, 15% poly Aspartic acid, 10.0% epoxysuccinic acid, 6% sodium cetyl sulfonate, 12% cetyltrimethylammonium bromide and the balance water.

[0058] The above-mentioned chelating agent of this embodiment was tested indoors for its precipitation inhibition ability, scale dissolution ability, and surface tension reduction. The experimental data are shown in Table 6, Table 7, Table 8 and Table 9.

[0059] Table 6 Chelating agent is to the precipitation inhibition rate of calcium fluoride

[0060]

[0061]

[0062] Table 7 Chelating agent is to the precipitation inhibition rate of fluorosilicate

[0063] acid Filter paper mass (g) Filter paper + sediment mass (g) Na 2 SiF 6 Inh...

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Abstract

The invention provides a chelating agent for reservoir acidification augmentation injection construction and a preparation method and application thereof. The raw material composition of this chelating agent comprises: 10.0%-20.0% methanesulfonic acid, 10.0%-20.0% methanol, 10.0%-20.0% polyaspartic acid, 10.0%-15.0% epoxysuccinic acid, 5.0%-10.0% sodium cetyl sulfonate, 10.0%-15.0% cetyltrimethylammonium bromide and the balance water. The present invention also provides a preparation method of the above-mentioned chelating agent. The chelating agent for acidizing and increasing injection construction of reservoirs of the present invention is used in acidizing and increasing injection construction, can effectively dissolve rock cracks, and can be used directly without reverse discharge.

Description

technical field [0001] The invention relates to a chelating agent and a preparation method thereof, in particular to a chelating agent in reservoir acidification construction and a preparation method thereof, and belongs to the technical field of petroleum exploitation. Background technique [0002] Acidizing technology is one of the widely used oil and gas well stimulation measures at present, which can effectively remove the damage to the reservoir during drilling, completion and production, and increase oil and gas production. [0003] Conventional acidizing is to inject a certain type and concentration of acid solution and a formula acid solution composed of additives into the reservoir in a certain order to dissolve some minerals in the formation rock or blockages in the pores and fractures, improve the permeability of the formation or fractures, and improve the seepage conditions , to achieve the purpose of restoring or increasing the productivity of oil and gas wells....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/74C09K8/528E21B43/27
CPCC09K8/528C09K8/74C09K2208/12E21B43/26C09K8/725E21B43/25
Inventor 慕立俊李宪文陆红军王勇姚斌姬振宁张随望陆小兵邓志颖隋蕾王尔珍宋昭杰
Owner PETROCHINA CO LTD