Injection agent for water injection well and preparation method and application of injection agent

A technology of injection enhancer and water injection well, which can be used in chemical instruments and methods, earth-moving drilling and production, wellbore/well components, etc. It can solve the problem of increasing the permeability difference between layers, damage to low permeability layers, and reducing reservoir permeability. and other problems, so as to reduce the surface and interfacial tension of the reservoir, improve the development effect of water flooding, and reduce the capillary resistance.

Active Publication Date: 2018-09-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] After the oilfield enters the middle and late stage of water injection development, due to the change of pressure, temperature and other conditions, as well as the thermodynamic instability and chemical incompatibility of water, knots often occur in water injection formations, oil casings, downhole, surface equipment and gathering and transportation pipelines. scale; and the clay minerals in the reservoir absorb and inject water and expand, thereby reducing the porosity and permeability of the reservoir and causing damage to the reservoir, which may cause great damage to the low-permeability layer, reducing the permeability of the reservoir and increasing the The large difference in permeability between layers increases the conflict between layers, resulting in high water injection pressure and difficult injection of water injection wells, resulting in a decrease in oil and gas field production, an increase in water injection pressure, downhole and surface equipment, and even oil and gas wells shut down

Method used

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  • Injection agent for water injection well and preparation method and application of injection agent
  • Injection agent for water injection well and preparation method and application of injection agent
  • Injection agent for water injection well and preparation method and application of injection agent

Examples

Experimental program
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Effect test

Embodiment 1

[0026] This embodiment provides a water injection well injection booster, the raw material composition of the water injection well injection booster comprises: 8.0% sulfamic acid, 12.0% methanol, 15.0% tartaric acid, 12.0% ethylenediaminetetramethyl Forked phosphoric acid, 8.0% sodium polyacrylate, 5% cocoyl isethionic acid and the balance water.

[0027] The above-mentioned injection booster for water injection wells is prepared through the following steps:

[0028] At 15°C-25°C, add tartaric acid, ethylenediamine tetramethylene phosphoric acid, sodium polyacrylate, cocoyl isethionic acid and water to sulfamic acid in sequence, stir, add methanol, stir, and obtain a water injection well Use booster.

[0029] The anti-expansion rate, shrinkage rate and reduction of oil-water interfacial tension of the above-mentioned injection booster of this embodiment were tested indoors, and the experimental data are as follows.

[0030] (1) Table, interfacial tension evaluation

[0031]...

Embodiment 2

[0045] This embodiment provides a water injection well injection booster, the raw material composition of the water injection well injection booster comprises: 10.0% sulfamic acid, 15.0% methanol, 12.0% tartaric acid, 15.0% ethylenediaminetetramethyl Formic phosphoric acid, 6.0% sodium polyacrylate, 7% cocoyl isethionic acid and the balance water.

[0046] The above-mentioned injection booster for water injection wells is prepared through the following steps:

[0047] At 15°C-25°C, add tartaric acid, ethylenediamine tetramethylene phosphoric acid, sodium polyacrylate, cocoyl isethionic acid and water to sulfamic acid in sequence, stir, add methanol, stir, and obtain a water injection well Use booster.

[0048] The anti-expansion rate, shrinkage rate and reduction of oil-water interfacial tension of the above-mentioned injection booster of this embodiment were tested indoors, and the experimental data are as follows.

[0049] (1) Table, interfacial tension evaluation

[0050...

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PUM

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Abstract

The invention provides an injection agent for a water injection well and a preparation method and application of the injection agent. The injection agent for the water injection well comprises the following raw material components: 5.0%-10.0% of sulfamic acid, 10.0%-20.0% of methanol, 10.0%-20.0% of tartaric acid, 10.0%-20.0% of ethylenediamine theramethylenephosphonic acid, 5.0%-10.0% of sodium polyacrylate, 5.0%-8.0% of coco-isethionic acid and the balance of water. The invention further provides a preparation method of the injection agent. The injection agent for the water injection well can be used in a construction technology for acidizing of a reservoir, and can be directly used. While dissolving scale, the injection agent further can achieve dilation effect, and the purposes of reducing pressure and increasing yield are achieved finally.

Description

technical field [0001] The invention relates to an injection booster for water injection wells, in particular to an injection booster capable of dissolving scale, shrinking expansion and reducing pressure, and belongs to the technical field of petroleum exploitation. Background technique [0002] After the oilfield enters the middle and late stage of water injection development, due to the change of pressure, temperature and other conditions, as well as the thermodynamic instability and chemical incompatibility of water, knots often occur in water injection formations, oil casings, downhole, surface equipment and gathering and transportation pipelines. scale; and the clay minerals in the reservoir absorb and inject water and expand, thereby reducing the porosity and permeability of the reservoir and causing damage to the reservoir, which may cause great damage to the low-permeability layer, reducing the permeability of the reservoir and increasing the Large interlayer permea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/528C09K8/588C09K8/74
CPCC09K8/528C09K8/588C09K8/74C09K2208/12C09K8/725C09K8/88E21B43/16E21B43/20
Inventor 慕立俊李宪文陆红军王勇姚斌姬振宁张随望陆小兵宋昭杰隋蕾邓志颖王尔珍王薇王俊涛
Owner PETROCHINA CO LTD
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