Low-temperature-resistant fracturing fluid for oil exploitation and preparation method of fracturing fluid

A technology for oil exploitation and low temperature resistance, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., and can solve problems such as difficult fracturing, poor low temperature resistance of fracturing fluid, and rapid decrease in sand-carrying capacity of fracturing fluid, etc. , to achieve excellent low temperature resistance, good shear resistance, and suitable for large-scale application

Inactive Publication Date: 2015-08-26

无棣华信石油技术服务有限公司

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AI-Extracted Technical Summary

Problems solved by technology

[0004] The ability to suspend and carry fracturing sand in the fracturing fluid is its basic requirement. However, although the existing fracturing fluid has a certain ability to carry fracturing sand...

Abstract

The invention relates to a low-temperature-resistant fracturing fluid for oil exploitation and a preparation method of the fracturing fluid, and belongs to the technical field of reservoir fracturing improvement for an oil gas well. The fracturing fluid comprises components in parts by weight as follows: 0.5-2 parts of cellulase, 2-8 parts of acrylamide, 1-5 parts of sulfosalicylic acid triethanolamine ester, 1.5-2 parts of fenugreek gum, 0.2-1.8 parts of guar gum, 0.6-2.5 parts of a bactericide, 0.2-0.8 parts of polyacrylamide, 2-5 parts of sodium bicarbonate, 1-3 parts of sodium citrate, 1-5 parts of demulsifire N-220 series, 2-10 parts of ethanol and 150-180 parts of water. The low-temperature-resistant fracturing fluid has good compatibility with a formation core and a fluid, and facilitates formation fracture; the fracturing fluid has excellent low-temperature-resistant effect, still has good sand carrying capacity at a lower temperature, has good anti-shearing performance, can break gel after construction and flows back quickly.

Application Domain

Drilling composition

Technology Topic

Citrate sodiumChemistry +16

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$Low-temperature-resistant fracturing fluid for oil exploitation and preparation method of fracturing fluid$

Examples

Experimental program(4)
Comparison scheme(2)
Effect test(1)

Example Embodiment

[0024] Example 1

[0025] Petroleum development uses low-temperature resistant fracturing fluid, including the following components in parts by weight: 0.5 parts of cellulase, 2 parts of acrylamide, 1 part of sulfosalicylic acid triethanolamine, 1.5 parts of coumarin gum, guar 0.2 parts of glue, 0.6 parts of bactericide, 0.2 parts of polyacrylamide, 2 parts of sodium bicarbonate, 1 part of sodium citrate, 1 part of polyoxypropylene polyoxyethylene propylene glycol ether, 2 parts of ethanol, 150 parts of water, wherein the sterilization The agent is rosin amine.

[0026] The preparation method of the low-temperature resistant fracturing fluid used in the petroleum cracking comprises the following steps:

[0027] Step 1: Mix cellulase, acrylamide and triethanolamine sulfosalicylate and stir evenly, heat up to 40°C, then add couma gum and guar gum in sequence, and stir evenly to obtain mixture A;

[0028] Step two, sequentially mix and stir the bactericide, polyacrylamide, sodium bicarbonate, sodium citrate, polyoxypropylene polyoxyethylene propylene glycol ether and ethanol to obtain a mixture B;

[0029] Step 3: Add the mixture B obtained in step 2 to the mixture A obtained in step 1, stir and raise the temperature to 50°C, add water, stir evenly, and cool to obtain the low-temperature resistant fracturing fluid for the petroleum oil.

[0030] The above-mentioned petroleum cracking adopts a low-temperature resistant fracturing fluid preparation method, wherein the stirring speed in step one is 150 r/min, and the stirring speed in step two is 300 r/min.

Example Embodiment

[0031] Example 2

[0032] Petroleum development uses low temperature resistant fracturing fluid, including the following components in parts by weight: 2 parts of cellulase, 8 parts of acrylamide, 5 parts of sulfosalicylic acid triethanolamine, 2 parts of coumadin, guar 1.8 parts of glue, 2.5 parts of bactericide, 0.8 parts of polyacrylamide, 5 parts of sodium bicarbonate, 3 parts of sodium citrate, 5 parts of polyoxypropylene polyoxyethylene propylene glycol ether, 10 parts of ethanol, 180 parts of water, wherein the sterilization The agent is rosin amine.

[0033] The preparation method of the low-temperature resistant fracturing fluid used in the petroleum cracking comprises the following steps:

[0034] Step 1: Mix cellulase, acrylamide and triethanolamine sulfosalicylate and stir evenly, heat up to 50°C, then add couma gum and guar gum in sequence, and stir evenly to obtain mixture A;

[0035] Step two, sequentially mix and stir the bactericide, polyacrylamide, sodium bicarbonate, sodium citrate, polyoxypropylene polyoxyethylene propylene glycol ether and ethanol to obtain a mixture B;

[0036] Step 3: Add the mixture B obtained in step 2 to the mixture A obtained in step 1, stir and raise the temperature to 60°C, add water, stir evenly, and cool to obtain the low-temperature resistant fracturing fluid.

[0037] The above-mentioned petroleum cracking adopts a low-temperature resistant fracturing fluid preparation method, wherein the stirring speed in step one is 200 r/min, and the stirring speed in step two is 500 r/min.

Example Embodiment

[0038] Example 3

[0039] Petroleum development uses low-temperature resistant fracturing fluid, including the following components in parts by weight: 1 part of cellulase, 5 parts of acrylamide, 2 parts of sulfosalicylic acid triethanolamine, 1.6 parts of coumarin, guar 1 part of glue, 1.8 parts of bactericide, 0.5 parts of polyacrylamide, 3 parts of sodium bicarbonate, 2 parts of sodium citrate, 3 parts of polyoxypropylene polyoxyethylene propylene glycol ether, 5 parts of ethanol, 170 parts of water, wherein the sterilization The agent is rosin amine.

[0040] The preparation method of the low-temperature resistant fracturing fluid used in the petroleum cracking comprises the following steps:

[0041] Step 1: Mix cellulase, acrylamide and triethanolamine sulfosalicylate and stir evenly, heat up to 45°C, add coumarin and guar gum in sequence, and stir evenly to obtain mixture A;

[0042] Step two, sequentially mix and stir the bactericide, polyacrylamide, sodium bicarbonate, sodium citrate, polyoxypropylene polyoxyethylene propylene glycol ether and ethanol to obtain a mixture B;

[0043] In step three, add the mixture B obtained in step two to the mixture A obtained in step one, stir and raise the temperature to 55° C., add water, stir evenly, and cool to obtain the low-temperature resistant fracturing fluid for the oil.

[0044] The above-mentioned petroleum cracking adopts a low-temperature resistant fracturing fluid preparation method, wherein the stirring speed in step one is 180 r/min, and the stirring speed in step two is 400 r/min.

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Classification and recommendation of technical efficacy words

Good compatibility
Good low temperature resistance

Low-temperature-resistant fracturing fluid for oil exploitation and preparation method of fracturing fluid

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

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Example Embodiment

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Description & Claims & Application Information

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