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Clay anti-swelling and swelling shrinkage agent and preparation method thereof

A technology of anti-swelling and shrinking agent and clay, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of insignificant improvement in permeability of low-permeability reservoirs, lack of shrinkage and swelling performance, and general temperature resistance and other problems, to achieve good compatibility, prevent continuous hydration expansion, and small molecular weight

Inactive Publication Date: 2016-07-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the temperature resistance of these clay stabilizers is average, and the effect is obviously reduced when the temperature is higher than 100 ° C. At the same time, th

Method used

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  • Clay anti-swelling and swelling shrinkage agent and preparation method thereof
  • Clay anti-swelling and swelling shrinkage agent and preparation method thereof
  • Clay anti-swelling and swelling shrinkage agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A kind of clay anti-swelling agent, the mass percentage of its component is:

[0028] Alkylated polyetheramine 20% with the structure

[0029] Polyethylenediamine 2%;

[0030] Acid 20%;

[0031] Water 58%.

[0032] R in the above-mentioned alkylated polyetheramine is C 2 h 4 , R 1 for C 2 Alkyl group, x=2; the acid is hydrochloric acid with a mass concentration of 37%. First add 116g of deionized water into a three-necked beaker, raise the temperature to 45°C, then add 40g of alkylated polyetheramine, stir until fully dissolved, then add 40g of hydrochloric acid, continue stirring for 0.5h, the pH of the solution is in the range of 6-7 (Because the acid will be lost during the process of weighing and dropping, the pH value of the prepared solution is not fixed each time), then add 4g polyethylenediamine, stir until fully dissolved, stir at 45°C for 1h, and obtain a light yellow transparent liquid.

[0033] According to the petroleum and natural gas industry s...

Embodiment 2

[0035] A kind of clay anti-swelling agent, its component content mass percent:

[0036] Alkylated polyetheramine 25%, structural formula

[0037] Polyethylenediamine 3%;

[0038] Acid 25%;

[0039] Water 47%.

[0040] R in the above-mentioned alkylated polyetheramine is C 2 h 4 , R 1 for C 3 Straight-chain alkyl, x=3; the acid is hydrochloric acid with a mass concentration of 37%. First add 94g of deionized water into a three-necked beaker, raise the temperature to 45°C, then add 50g of alkylated polyetheramine, stir until fully dissolved, then add 50g of hydrochloric acid, continue stirring for 0.5h, the pH of the solution is in the range of 5-6 , and then add 6g of polyethylenediamine, stir until fully dissolved, and stir at 40°C for 1h to obtain a light yellow transparent liquid.

[0041] According to the petroleum and natural gas industry standard SY / T5971-94, test the anti-expansion and shrinkage effect of the sample at room temperature and after heat treatment ...

Embodiment 3

[0043] A kind of clay anti-swelling agent, its component content mass percent:

[0044] Alkylated polyetheramine 30%, structural formula is

[0045] Polyethylenediamine 5%;

[0046] Acid 33%;

[0047] Water 32%.

[0048] R in the above-mentioned alkylated polyetheramine is C 2 h 4 , R 1 for C 4 Straight-chain alkyl, x=4; the acid is hydrochloric acid with a mass concentration of 37%. First add 64g of deionized water into a three-necked beaker, raise the temperature to 50°C, then add 60g of alkylated polyetheramine, stir until fully dissolved, then add 66g of hydrochloric acid, continue stirring for 0.5h, the pH of the solution is in the range of 4-5 , and then add 10 g of polyethylene diamine, stir until fully dissolved, and stir at 45° C. for 1 h to obtain a light yellow transparent liquid.

[0049] According to the petroleum and natural gas industry standard SY / T5971-94, test the anti-expansion and shrinkage effect of the sample at room temperature and after heat t...

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Abstract

The invention provides a clay anti-swelling and swelling shrinkage agent and a preparation method thereof.The clay anti-swelling and swelling shrinkage agent is used for oilfield acidification and water injection.The anti-swelling and swelling shrinkage agent consists of the following components in percentages by mass: 20%-30% of alkylated polyether amine, 2%-5% of polyethylenimine, 20-35% of acid and the balance of water, and the sum of mass percentages of the components is 100%.The anti-swelling rate of the anti-swelling and swelling shrinkage agent can reach 92.8%, and the swelling shrinkage rate of the anti-swelling and swelling shrinkage agent can reach 46.1%.The clay anti-swelling and swelling shrinkage agent is good in temperature resistance and excellent in anti-swelling endurance property, is suitable to be used in acidification and water injection, and is used for protecting permeability of a reservoir.

Description

Technical field: [0001] The invention relates to a clay anti-swelling and shrinking agent and a preparation method thereof, which are suitable for acidification water injection process. Background technique: [0002] Acidizing is one of the main technological measures for oil and gas wells to stabilize and increase production, and water injection wells to reduce pressure and increase injection. Various solid phase particles and impurities in the process of drilling, well completion, well workover and water injection can relieve the damage to the formation permeability and dredge the fluid seepage channels, thereby restoring and improving the productivity of the well. However, the ubiquitous clay minerals in the formation, especially those with strong water sensitivity (such as montmorillonite, illite-montmorillonite, etc.) will cause secondary damage to the formation during the acidification process and reduce the formation permeability. In order to protect the permeability...

Claims

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Application Information

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IPC IPC(8): C09K8/74C09K8/68
CPCC09K8/608C09K8/68C09K8/725C09K8/74C09K8/885C09K2208/12
Inventor 葛际江廖凯丽张贵才蒋平浮历沛张玲玉刘冉冉
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)