Crosslinking agent for polymer hydrofracturing fluid as well as preparation and application of crosslinking agent

A technology of cross-linking agent and fracturing fluid, which is applied in the direction of drilling compositions, chemical instruments and methods, and mining fluids, etc. It can solve the problem of poor hanging state of jelly, ineffective provocation, and unfavorable fracturing construction and other problems, to achieve the effect of increasing the cross-linking stability of jelly, reducing harm and high cross-linking strength

Active Publication Date: 2013-09-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] When this kind of cross-linking agent is applied to polymer fracturing fluid containing carboxylic acid groups, the jelly formed i...

Method used

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  • Crosslinking agent for polymer hydrofracturing fluid as well as preparation and application of crosslinking agent
  • Crosslinking agent for polymer hydrofracturing fluid as well as preparation and application of crosslinking agent

Examples

Experimental program
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Effect test

Embodiment 1

[0036] Add 150kg of tartaric acid and 590kg of water into a reactor with a volume of 2 square meters, stir for three minutes, slowly add 40kg of sodium bicarbonate, maintain the reaction temperature at 35°C, stir until completely dissolved, then add 40kg of aluminum trichloride and 70kg of oxychloride Zirconium, stirred for 3 hours, added 100kg of triethanolamine, 10kg of glyoxal, and stirred at a constant temperature of 45°C for 3 hours to obtain the product.

Embodiment 2

[0038] Add 220kg of citric acid and 335kg of water into a reactor with a capacity of 2 square meters, stir for three minutes, slowly add 60kg of sodium hydroxide, maintain the reaction temperature at 45°C, stir until completely dissolved, then add 80kg of aluminum trichloride and 120kg of oxygen Zirconium chloride, stirred for 3 hours, added 150kg of triethanolamine, 35kg of glyoxal, and stirred at a constant temperature of 55°C for 3 hours to obtain the product.

Embodiment 3

[0040] Add 300kg of lactic acid and 140kg of water into a reactor with a capacity of 2 square meters, stir for three minutes, slowly add 80kg of potassium hydroxide, maintain the reaction temperature at 55°C, stir until completely dissolved, then add 100kg of aluminum trichloride and 150kg of oxychloride Zirconium, stirred for 3 hours, added 180kg of triethanolamine, 50kg of glyoxal, and stirred at a constant temperature of 65°C for 3 hours to obtain the product.

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Abstract

The invention relates to a crosslinking agent for polymer hydrofracturing fluid as well as preparation and application of the crosslinking agent. The crosslinking agent comprises the following percentage by weight: 15-30 percent of organic acid, 4-8 percent of inorganic base, 10-18 percent of organic amine, 4-10 percent of trivalent metal ion salt, 7-15 percent of tetravalent zircon salt, 1-5 percent of aldehyde and the balance of water. The crosslinking agent is controllable in crosslinking time within 10-180 seconds and high in crosslinking agent and has the gel cross-linking temperature tolerance reaching 150DEG C; the crosslinking agent does not contain phenol, and the damages to the environment are reduced; the crosslinking agent can be synthesized in need of the condition of 35-65DEG C, and the finished product of the crosslinking agent can be obtained in a one-time manner without secondary blending; and the crosslinking agent contains triethanolamine, so that the gel crosslinking stability of the crosslinking agent is greatly improved.

Description

technical field [0001] The invention relates to a crosslinking agent for polymer fracturing fluid and its preparation and application. Background technique [0002] Fracturing technology is one of the main measures to increase production in the middle and late stages of oilfield development, and the performance of the fracturing fluid system directly affects the effect of fracturing. At present, guar gum fracturing fluid is still the most widely used fracturing fluid system in my country. Since the raw material price of hydroxypropyl guar gum (grade 1) rose from 18,300 yuan / ton in 2010 to 158,000 yuan / ton in 2012, the cost of fracturing was greatly increased and the promotion of fracturing technology was restricted. The new polymer fracturing fluid can replace conventional guar gum fracturing fluid due to its advantages of low cost, low friction, low residue, easy flowback, little damage to the formation, and long storage time. [0003] At present, polyacrylamide and its m...

Claims

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Application Information

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IPC IPC(8): C09K8/68E21B43/26
Inventor 吴志俊张子明邓宏李超李玉印周坤邵恒玉马振张滕包放关伟罗淇峰赵烨
Owner PETROCHINA CO LTD
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