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Self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid

An ultra-high temperature, fracturing fluid technology, applied in the direction of production fluid, wellbore/well components, drilling composition, etc., can solve the problems affecting performance, fracturing fluid is easy to decompose, etc., to achieve convenient operation, low cost, The effect of broad market prospects

Active Publication Date: 2018-06-22
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In view of the above prior art, the present invention provides a self-healing low-damage ultra-high temperature resistant fracturing fluid to solve the technical problem that traditional fracturing fluids are easy to decompose at high temperatures and affect performance

Method used

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  • Self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid
  • Self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid
  • Self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid

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Embodiment 1

[0027] This embodiment adopts five kinds of monomers of acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinylpyrrolidone and dimethyl octadecyl allyl ammonium chloride in a weight ratio of 60:20:18:1.5:0.1 Initiate polymerization at 30°C, obtain a copolymer after polymerization for 10 hours, then shred the copolymer, dry it at 40°C, and finally pulverize it to pass through a 250-mesh sieve to obtain a polymer Thickener powder. The polymer thickener is formulated into a 0.4wt% solution, and 0.015wt% polyethyleneimine and 0.04wt% ammonium persulfate are added, and the fracturing fluid is obtained after thorough stirring.

[0028] in the 170s -1 , The curve of the apparent viscosity of the high temperature resistant fracturing fluid system with time at 180°C, as shown in figure 1 shown. From figure 1 It can be seen that when the temperature rises, the apparent viscosity of the high-temperature resistant fracturing fluid drops sharply. When it reaches 18...

Embodiment 2

[0030] In this embodiment, five monomers of acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, N-vinylpyrrolidone and methyldiallyl ammonium chloride are used in a weight ratio of 65:20: 15:2.0:0.5 Initiate polymerization at 35°C, obtain a copolymer after polymerization for 10 hours, then shred the copolymer, dry it at 40°C, and finally pulverize it to pass through a 250-mesh sieve to obtain a polymer thickener powder . Next, the polymer was formulated into a 0.4wt solution, and 0.015wt% of polyethyleneimine and 0.04wt% of ammonium persulfate were added and fully stirred to obtain a fracturing fluid.

[0031] in the 170s -1 , The curve of the apparent viscosity of the high temperature resistant fracturing fluid system with time at 200°C, as shown in figure 2 shown. From figure 2 It can be seen that when the temperature rises, the apparent viscosity of the high-temperature resistant fracturing fluid drops sharply. When it reaches 200°C, the viscosity is ...

Embodiment 3

[0033] In this embodiment, five monomers of acrylamide, acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, sodium p-styrenesulfonate and methacryloxyethyltrimethylammonium chloride are used in weight ratio Initiate polymerization at 30°C at 65:17:15:2.0:1.0, obtain a copolymer after 10 hours of polymerization, then shred the copolymer, dry it at 40°C, and finally pulverize it to pass through a 200-mesh sieve to obtain a polymerization thickener powder. Next, the polymer is formulated into a 0.6wt% solution, and 0.02wt% polyethyleneimine and 0.06wt% ammonium persulfate capsules are added and fully stirred to obtain a fracturing fluid.

[0034] in the 170s -1 , The curve of the apparent viscosity of the high temperature resistant fracturing fluid system versus time was tested at 220°C, as shown in image 3 shown. From image 3 It can be seen that when the temperature rises, the apparent viscosity of the high-temperature resistant fracturing fluid drops sharply. When it...

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Abstract

The invention discloses self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid, which is prepared from the following components by mass percent: 0.4-0.8wt% of polymer thickening agent, 0.015-0.02wt% of non-metallic crosslinking agent, 0.04-0.06wt% of gel breaker and the balance of water, wherein the polymer thickening agent is prepared by polymerizing acrylamide, acrylicacid, 2-acrylamido-2-methylpropanesulfonic acid, a rigid monomer and a cationic hydrophobic monomer according to a weight ratio of (55-70) to (15-20) to (15-20) to (0.5-3) to (0.1-1.0), the polymerization temperature is 30-40 DEG C, and the polymerization time is 8-10h. After the self-repairing, low-damage and ultra-high temperature-resistant fracturing fluid is adopted, the technical problem thatthe traditional fracturing fluid is easy to decompose at the high temperature, so that the performance of the fracturing fluid is influenced can be effectively solved.

Description

technical field [0001] The invention belongs to the technical field of oil and gas field development, and in particular relates to a self-repairing, low-damage and ultra-high temperature resistant fracturing fluid. Background technique [0002] In recent years, with the increasing demand for energy in the world and the advancement of exploration technology, the exploration and development of oil and gas resources has continued to develop in depth. The number of deep wells with abnormally high temperature of 170°C is increasing day by day, some oil wells are even deeper than 7000m, and the temperature of these oil wells has reached 200°C. This puts forward higher requirements on the temperature and shear resistance of the fracturing fluid system, requiring the fracturing fluid to maintain good rheology and sand-carrying capacity at reservoir temperatures above 200°C or even 220°C. The traditional organic boron cross-linked fracturing fluid is only suitable for use at a tempe...

Claims

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Application Information

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IPC IPC(8): C09K8/68
CPCC09K8/685C09K8/882C09K8/887C09K2208/26E21B43/26
Inventor 毛金成张阳赵金洲杨小江张恒
Owner SOUTHWEST PETROLEUM UNIV
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