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Clear fracturing fluid

A technology for cleaning fracturing fluid and triethanolamine ester, which is applied to drilling compositions, chemical instruments and methods, etc., and can solve the problem that the fracturing fluid is not specified to adapt to the reservoir temperature, the main components of the thickener are not specified, and the temperature resistance is not specified. Poor performance and other problems, to achieve the effect of good anti-swelling stability, good anti-swelling effect and good shear resistance

Active Publication Date: 2012-08-22
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this fracturing fluid are: ①There is no potassium chloride in the formula; ②The main component of the thickener is not specified; ③The adaptability of the fracturing fluid to the reservoir temperature is not specified, etc.
The disadvantages of this fracturing fluid are: ① there is no potassium chloride in the formula; ② the thickener is hexadecyltrimethylammonium bromide, which has poorer thickening ability than octadecyltrimethylammonium chloride, Disadvantages such as poor temperature resistance and high price
The disadvantages of this fracturing fluid are: ①There is no potassium chloride in the formula; ②The thickener is a mixture of quaternary ammonium salts with 12 to 18 carbon alkyls, which has a thickening ability greater than that of octadecyltrimethylammonium chloride. Poor, poor temperature resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Example 1: Coal seam 11# of Hancheng Coalbed Methane Well WL1-001 has a buried depth of 869-874m and a temperature of 36°C. The weight percentage of each component of the clean fracturing fluid is: dimethyl octadecyl hydroxyethyl quaternary ammonium nitrate, 0.5%; triethanolamine sulfosalicylate, 0.2%; potassium chloride, 1%; clear water, 98.3%.

[0032]Clean fracturing fluid preparation process: preparation of triethanolamine sulfosalicylate: triethanolamine sulfosalicylate by weight: 5-sulfosalicylic acid, 30%; triethanolamine, 30% %; water, 40%. First add clear water and triethanolamine to the reaction kettle, add 5-sulfosalicylic acid under stirring conditions, heat up to 62°C, stir and react for 30 minutes, stop stirring and then lower the temperature to room temperature to obtain sulfosalicylic acid triethanolamine ester.

[0033] Preparation of clean fracturing fluid: First, add water into the large liquid mixing tank, add potassium chloride and triethanolamin...

Embodiment 2

[0035] Example 2: The fracturing section of Well Xi 6-47 is 1344.0-1398.0m, the reservoir temperature is 55°C, and the weight percentage of each component of the clean fracturing fluid is: dimethyl octadecyl hydroxyethyl quaternary ammonium nitrate, 0.8%; triethanolamine sulfosalicylate, 0.4%; potassium chloride, 1%; water, 97.8%.

[0036] Preparation of triethanolamine sulfosalicylate: The weight percentages of the components of triethanolamine sulfosalicylate are: 5-sulfosalicylic acid, 29%; triethanolamine, 32%; water, 39%. First add clear water and triethanolamine to the reaction kettle, add 5-sulfosalicylic acid under stirring condition, heat at 65°C, stir and react for 30 minutes to obtain triethanolamine sulfosalicylate.

[0037] Preparation of clean fracturing fluid: First, add water into the large liquid mixing tank, add potassium chloride and triethanolamine sulfosalicylate under stirring conditions, and then add dimethyl octadecyl hydroxyethyl quaternary after compl...

Embodiment 3

[0039] Example 3: The fracturing section of Well Tong 47-43x is 2254.0-2269.6m, the reservoir temperature is 83°C, and the weight percentage of each component of the clean fracturing fluid is: dimethyloctadecylhydroxyethyl quaternary ammonium nitrate, 2.5%; Triethanolamine Sulfosalicylate, 1%; Potassium Chloride, 1.5%; Water, 95%.

[0040] Clean fracturing fluid preparation process: preparation of triethanolamine sulfosalicylate: triethanolamine sulfosalicylate by weight: 5-sulfosalicylic acid, 28%; triethanolamine, 26% %; water, 46%. First add clear water and triethanolamine to the reaction kettle, add 5-sulfosalicylic acid under stirring condition, heat at 68°C, stir and react for 30 minutes to obtain triethanolamine sulfosalicylate.

[0041] Add clear water into the large liquid preparation tank, add potassium chloride under stirring conditions, add 1 / 2 of the amount of triethanolamine sulfosalicylate, and then add dimethyl octadecyl hydroxyethyl quaternary ammonium after ...

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PUM

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Abstract

The invention relates to clear fracturing fluid, which is used for fracturing treatment of a hypotonic and water-sensitive reservoir, and comprises the following components in percentage by weight: 0.5-5 percent of dimethyl octadecyl ethoxy quaternary ammonium nitrate; 0.2-2 percent of sulfosalicylic acid triethanolamine ester; 0.5-2 percent of potassium chloride; and the balance of water, wherein the weight percentage of the components is a hundred percent. A preparation method comprises the following steps of: adding clear water into a mixing liquid tank, adding the potassium chloride and the sulfosalicylic acid triethanolamine ester under a stirring condition, uniformly stirring, adding the dimethyl octadecyl ethoxy quaternary ammonium nitrate, and stirring for 15 minutes after adding the materials, so that the concentration or the viscosity of liquid in the upper part and the lower part of the tank is uniform. The clear fracturing fluid has the effects that: the clear fracturing fluid is suitable for fracturing the reservoir at the temperature of 10 DEG C-110 DEG C, the damage caused by residues of the fracturing liquid and reservoir water sensitivity can be reduced, and the crude output is improved.

Description

technical field [0001] The invention relates to the technical field of oil recovery in oil fields, in particular to a fracturing fluid for oil and gas field fracturing reconstruction, which is a clean fracturing fluid for low-permeability and water-sensitive reservoirs. Background technique [0002] During the exploration and development of oil and gas reservoirs, some low-permeability and water-sensitive reservoirs are often found, such as the Tong 47 fault block in Huabei Oilfield, with a porosity of 11.9-20.0% and a permeability of 0.238-4.41 μm 2 ×10 -3 , is a medium-porous, low-permeability, water-sensitive reservoir. The use of polymer fracturing fluid systems such as guar gum for fracturing of such reservoirs will not only leave some residues in the formation and support fractures, but also cause the expansion, dispersion and migration of clay minerals in the rock, which will affect the formation and support fractures. Support cracks cause greater damage. Therefore...

Claims

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Application Information

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IPC IPC(8): C09K8/68
Inventor 崔会杰王彩玲车航余东合刘国华张陶宁
Owner PETROCHINA CO LTD
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