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Thickening agent for liquid carbon dioxide fracturing and preparation method thereof

A thickener and fracturing technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of ineffective thickening effect, high wellbore friction, and high construction pressure, and improve sand-carrying performance. , The effect of increasing viscosity and reducing filtration loss

Active Publication Date: 2015-09-16
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, domestic and foreign practical experience shows that liquid CO 2 The biggest problem in fracturing is its low viscosity (about 0.1mPa.s) and poor sand-carrying capacity, which leads to the need for large pump injection displacement, resulting in high wellbore friction, high construction pressure, and increased construction difficulty and cost. And since liquid CO 2 The temperature during fracturing construction is extremely low, and the low temperature causes the substances in the existing fracturing fluid system to increase the viscosity of the fracturing fluid to be applied to liquid CO 2 There is basically no viscosity-increasing effect during fracturing, and no liquid CO has been retrieved so far. 2 Patents related to special viscosifiers for fracturing

Method used

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  • Thickening agent for liquid carbon dioxide fracturing and preparation method thereof
  • Thickening agent for liquid carbon dioxide fracturing and preparation method thereof
  • Thickening agent for liquid carbon dioxide fracturing and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Take 25g of clear water and 10g of isopropanol 1000 into the flask, heat to 60°C, add 15g of acetic acid, stir to dissolve, then add 30g of octadecyltrimethylammonium chloride, 20g of octadecyldihydroxyethyl Ammonium methyl ammonium nitrate, keep the temperature at 60°C, stir for 30 minutes, after it is completely dissolved, cool to room temperature to obtain liquid CO 2 Viscosifier for fracturing.

Embodiment 2

[0038] Take 55g of clear water and 10g of ethanol into the flask, heat to 60°C, add 5g of citric acid, stir to dissolve, then add 20g of octadecyltrimethylammonium bromide, 10g of octadecyldihydroxyethylmethyl ammonium bromide, keep the temperature at 60°C, stir for 30 minutes, after all dissolve evenly, cool to room temperature to obtain liquid CO 2 Viscosifier for fracturing.

Embodiment 3

[0040] Take 15g of clear water and 20g of methanol into the flask, heat to 60°C, add 15g of salicylic acid, stir to dissolve, then add 30g of cetyltrimethylammonium bromide, 20g of octadecyldihydroxyethyl Methyl ammonium chloride, keep the temperature at 60°C, stir for 30 minutes, after it is completely dissolved, cool to room temperature to obtain liquid CO 2 Viscosifier for fracturing.

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Abstract

The invention discloses a thickening agent for liquid carbon dioxide fracturing and a preparation method thereof, relates to a thickening agent formula for the liquid carbon dioxide fracturing, and belongs to the technical field of oilfield chemistry. The thickening agent for the liquid carbon dioxide fracturing and the preparation method thereof are provided for solving the deficiency that existing liquid carbon dioxide fracturing viscosity is low. The thickening agent for the liquid carbon dioxide fracturing consists of constituents of, by weight percentage, 20-30% of long-chain alkyl trimethyl quaternary ammonium salt, 10-20% of long-chain alkyl dihydroxy ethyl methyl quaternary ammonium salt, 5-15% of organic acid, 10-20% of small molecular alcohol and the balance clear water. The thickening agent for the liquid carbon dioxide fracturing is made of raw material which is low in cost and easy to obtain, can substantially improve liquid carbon dioxide fracturing viscosity, reduces filtration loss of liquid carbon dioxide in the fracturing, and improves sand carrying capacity of the liquid carbon dioxide.

Description

technical field [0001] The present invention relates to a liquid CO 2 The invention relates to a thickener formula for fracturing, which belongs to the technical field of oil field chemistry. Background technique [0002] Liquid CO 2 Fracturing is a process that takes the form of pure liquid CO 2 It is also called dry fracturing as a technology for fracturing with sand-carrying fluid. Its many advantages are mainly reflected in: 1. No water phase, completely eliminate water sensitivity and water lock damage; fracturing fluid has extremely low interfacial tension, and can completely and quickly return from the reservoir after being heated and gasified; The residue has a good cleaning effect on the supporting fracture diversion bed, and maintains a high fracture conductivity and a long effective fracture length. [0003] Liquid CO 2 CO during fracturing 2 Maintain liquid state (or supercritical state), CO after construction 2 It becomes a gaseous state and is quickly di...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/62
CPCC09K8/602C09K8/62
Inventor 张军涛吴金桥申峰李伟孙晓高志亮段玉秀张锋三郭庆景丰展转盈雷茹王卫刚杨先伦
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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