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Preparation of water injection clay swelling prevention agent with antibacterial and anti-scale functions

The technology of anti-swelling agent and anti-scaling agent is applied in the field of preparation of clay anti-swelling agent, which can solve the problems of water injection pressure rise and blockage, and achieve the effects of slowing blockage, good sterilization effect and reducing dosage.

Inactive Publication Date: 2018-08-31
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These scale deposits block the water injection channel, causing the water injection pressure to rise. In order to solve this problem, it is necessary to add anti-scale agent in the injection water

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Example 1: The clay anti-swelling agent G with bactericidal and anti-scaling effects is prepared by compounding self-made A and B raw materials with C, D, E and F, wherein the mass ratio of each raw material is: A:B:C:D:E :F=15%:1%:30%:15%:20%:19%.

[0039] Dissolve G in tap water respectively to make solutions with mass concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt%, respectively. At room temperature (25°C), the anti-swelling rate and anti-washing rate at different concentrations , anti-scaling performance and bactericidal performance are:

[0040] 1) The anti-swelling rate of the concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% respectively: 81.1%, 86.5%, 91% and 94.2%, and the anti-washing rate: 83.4%, 86.3%, 89.5% % and 91.7%;

[0041] 2) Concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% have anti-scaling rates for calcium sulfate: 97.2%, 98%, 98.6% and 99%, and anti-scaling rates for calcium carbonate: 73.2%, 75.4%, 78.3% and 79.7%;

[0042] 3) The co...

Embodiment 2

[0045] Example 2: The clay anti-swelling agent G with bactericidal and anti-scaling effects is prepared by compounding self-made A and B raw materials with C, D, E and F, wherein the mass ratio of each raw material is: A:B:C:D:E :F=20%:2%:25%:10%:20%:23%.

[0046] Dissolve G in tap water respectively to make solutions with mass concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt%, respectively. At room temperature (25°C), the anti-swelling rate and anti-washing rate at different concentrations , anti-scaling performance and bactericidal performance are:

[0047] 1) The anti-swelling rate of concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% respectively: 83.7%, 87.2%, 91.1% and 94.4%, and the anti-washing rate: 84.2%, 86.6%, 90.1% % and 92.5%;

[0048] 2) Concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% have the antiscaling rate of calcium sulfate: 98.1%, 99%, 99.3% and 99.4%, and the antiscaling rate of calcium carbonate: 76.7%, 79.6%, 80.5% and 81.3%;

[0049] 3) The ...

Embodiment 3

[0052] Example 3: The clay anti-swelling agent G with bactericidal and anti-scaling effects is prepared by compounding self-made A and B raw materials with C, D, E and F, wherein the mass ratio of each raw material is: A:B:C:D:E :F=20%:4%:26%:15%:15%:20%.

[0053] Dissolve G in tap water respectively to make solutions with mass concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt%, respectively. At room temperature (25°C), the anti-swelling rate and anti-washing rate at different concentrations , anti-scaling performance and bactericidal performance are:

[0054] 1) The anti-swelling rate of concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% respectively: 86.6%, 90.4%, 92.1% and 95.7%, and the anti-washing rate: 85.3%, 90.2%, 91.3% % and 93.8%;

[0055] 2) Concentrations of 0.3wt%, 0.5wt%, 0.8wt% and 1.0wt% have anti-scaling rates for calcium sulfate: 99.2%, 99.4%, 99.9% and 99.9%, and anti-scaling rates for calcium carbonate: 80.6%, 82.1%, 83.9% and 84.8%;

[0056] 3) Conc...

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PUM

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Abstract

The invention provides preparation of a water injection clay swelling prevention agent with antibacterial and anti-scale functions and discloses a cationic surface active agent which is synthesized autonomously, has relatively good functions of preventing clay swelling or clay granule migration, and in addition has excellent anti-erosion resistance and a good antibacterial capability; a phosphino-maleic acid-acrylic copolymer anti-scale agent which is synthesized autonomously has a good calcium scale inhibition capability and is capable of retarding blocking of scale; after the phosphino-maleic acid-acrylic copolymer anti-scale agent is compounded with urea, dodecyl dimethyl benzyl ammonium chloride, ammonium chloride and potassium chloride, a clay swelling prevention agent with good antibacterial and anti-scale functions can be prepared. The water injection clay swelling prevention agent provided by the invention has a good property of inhibiting clay hydration swelling, a good anti-erosion capability, excellent capabilities of preventing calcium sulfate and calcium carbonate scale, is capable of effectively killing sulfate reducing bacteria, saprophytic bacteria and iron bacteria, in addition is low in cost, has a creative demonstration function for developing water injection clay swelling prevention agents with multiple functions in one agent, and has wide application prospects.

Description

technical field [0001] The invention relates to the preparation of a clay anti-swelling agent which is suitable for oil field water injection operation and has the functions of sterilization and anti-scaling and prevents clay from swelling. Background technique [0002] With the continuous development of my country's oilfield water injection development technology, more and more oilfields apply water flooding to production and development, and water injection development has become the development method of most oilfields. However, with the continuous development of water injection in oilfields, due to the incompatibility of foreign fluids and reservoir rock minerals and the incompatibility of foreign fluids and reservoir fluids, the formations are often blocked, the permeability of the reservoirs is reduced, and the water injection pressure is constantly increasing. Elevation, especially for low-permeability reservoirs, is more vulnerable to damage, leading to rapid rises i...

Claims

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Application Information

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IPC IPC(8): C09K8/584C09K8/58C09K8/588
CPCC09K8/58C09K8/584C09K8/588C09K2208/12
Inventor 马喜平李俊辰杨苗黄莉廖明飞卿大咏
Owner SOUTHWEST PETROLEUM UNIV
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