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A water-swellable fracturing temporary plugging agent with controllable degradation, preparation method and application thereof

A temporary plugging agent and fracturing technology, which is applied in chemical instruments and methods, earthwork drilling, drilling composition, etc. Ideal and other problems, to achieve the effect of adjustable degradation time, improved degradation performance and strength, high toughness and strength

Active Publication Date: 2022-06-07
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its own sensitivity to temperature, the applicable temperature range is small, which limits the use of water-swellable temporary plugging agent in fracturing to a certain extent.
[0004] Prior art, such as Chinese patent application (application number: CN2018114653317) discloses a water-soluble fracturing temporary plugging agent and its synthesis method, the method, and another Chinese patent application (CN2017109763628) discloses a temporary plugging agent and its preparation method And application, patent application (application number: CN2019101651229) discloses a temporary plugging agent for repeated fracturing and its preparation method and application, patent application (application number: CN2019110177725) discloses temporary plugging agent for repeated fracturing and its preparation method; patent application ( Application number: CN2019112169598) discloses a temporary plugging agent for shale oil-guided volume fracturing and its preparation method. However, although the above-mentioned prior art has played a temporary plugging role, due to its different components and ratios, its Temporary blocking effect is not ideal

Method used

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  • A water-swellable fracturing temporary plugging agent with controllable degradation, preparation method and application thereof
  • A water-swellable fracturing temporary plugging agent with controllable degradation, preparation method and application thereof
  • A water-swellable fracturing temporary plugging agent with controllable degradation, preparation method and application thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The preparation method of the controllable degradation of the water puffing type fracturing temporary plugging agent provided in the present embodiment is as follows:

[0036] In a 500mL flask add 6g of bone gel and 200g of distilled water, heated at 60 °C until the bone gel is completely dissolved, nitrogen replaces the air, respectively, 22 g of acrylic acid and 8 g of sodium hydroxide are added to fully neutralize, followed by 28 g of acrylamide, ultrasonic dispersion is uniformly placed in a water bath at 60 °C for heating and stirring, and then 0.025 g of N, N- methylene bisacrylamide, 0.2 g of potassium persulfate, 1.5 g of sulfonated asphalt, 1.0 g of sodium hydroxymethyl cellulose, The reaction was carried out for 4h, and the initial product obtained by the reaction was placed in an 80 °C blast drying box to dry to constant weight, and the product was crushed to obtain a controllable degradation of the puffed fracturing temporary plugging agent.

Embodiment 2

[0038] The preparation method of the controllable degradation of the water puffing type fracturing temporary plugging agent provided in the present embodiment is as follows:

[0039]In a 500mL flask add 5g of gelatin and 200g of distilled water, heated at 60 °C until the gelatin is completely dissolved, nitrogen is used to displace the air, respectively, 30g of acrylic acid and 10g of sodium hydroxide are added to full neutralize, followed by 30g of acrylamide, ultrasonic dispersion is uniformly placed in a water bath at 60 °C for heating and stirring, and then 0.03g of N, N- methylene bisacrylamide, 0.28g of potassium persulfate, 1.2g of sulfonated asphalt, 1.2g of hydroxymethyl cellulose sodium, The reaction was carried out for 4h, and the initial product obtained by the reaction was placed in an 80 °C blast drying box to dry to constant weight, and the product was crushed to obtain a controllable degradation of the puffed fracturing temporary plugging agent.

Embodiment 3

[0041] In the 500mL flask added 3g of gelatin and 200g of distilled water, heated at 60 °C until the gelatin was completely dissolved, nitrogen was used to replace the air, respectively, 15g of acrylic acid and 6g of sodium hydroxide were added to fully neutralize, and then 25g of acrylamide was added, and then placed in a 60 °C water bath for heating and stirring, and then 0.02g of N, N-methylenebiacrylamide, 0.2g of potassium persulfate, 0.5g of sulfonated asphalt, 0.8g of sodium hydroxyethyl cellulose were added for 4h The initial product obtained by the reaction is placed in an 80 °C blast drying box to dry to constant weight, and the product is crushed to obtain a controllable degradation of the puffed fracturing temporary plugging agent.

[0042] Second, the performance test of degradable fracturing temporary plugging agent

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Abstract

The invention relates to a method for fracturing stimulation in oil and gas fields, belonging to the technical field of oil field chemistry. The present invention obtains a polymer product by an aqueous solution polymerization method from comonomer acrylic acid and acrylamide, sodium hydroxide, bioadhesive, crosslinking agent, initiator, thickener, and auxiliary reinforcing agent; the polymer product is dried, The controllable degradation water-swellable fracturing temporary plugging agent can be obtained by shearing granulation. The temporary plugging agent of the present invention expands in volume by 30 to 50 times after being saturated with water, and has good self-adaptability to cracks of different shapes and sizes; it has good toughness, good bonding temporary plugging ability, and can be bonded to each other to form Dense temporary blocking layer, the maximum breakthrough pressure is above 30MPa; it is used with capsule gel breaker, the applicable temperature is 60-150°C, the degradation time can be adjusted, and the degradation rate can reach more than 90%. The preparation method of the invention is simple and safe, and has broad application prospects.

Description

Technical field [0001] The present invention relates to the field of oil and gas field fracturing production increase technology, specifically relates to a controllable degradation of the puffing type fracturing temporary plugging agent, preparation method and application thereof. Background [0002] With the gradual increase of the degree of production in various oil fields and the further development and utilization of low permeability reserves, the original artificial fracture production potential of old wells is getting smaller and smaller. Due to the heterogeneity of the reservoir plane and longitudinal direction, there are differences in different regions and the degree of utilization of the layer, and conventional fracturing technology has great limitations and even cannot achieve the oil enhancement effect. For the exploitation of such reservoirs, the steering repetitive fracturing technology is usually implemented, and the temporary plugging agent is added in real time d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/508C09K8/68C09K8/88C08F289/00C08F220/06C08F220/56C08F222/38E21B33/13E21B43/26
CPCC09K8/512C09K8/5083C09K8/68C09K8/685C09K8/882C09K8/887C08F289/00E21B33/13E21B43/26C08F220/06C08F220/56C08F222/385
Inventor 刘德新袁杰邱小龙徐正昊刘永盛汪龙梅
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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