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Fiber composite gel particle bridging agent for fractured reservoirs and preparation method thereof

A technology of fiber composite and gel particles, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of inability to accurately position and block particles, inability to achieve deep plugging, poor size matching, etc., and achieve deformation through Effects of strong ability, reduced strength, and improved gel strength

Active Publication Date: 2022-01-14
YANGTZE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the actual process, because large-sized flow-regulating particles are easy to form jams near the blasthole or near the wellbore during the injection process, deep plugging cannot be achieved, while small particles have poor matching between their particle size and fracture size. It is easy to leak to the deep part of the formation, and it is impossible to achieve accurate plugging of particles through bridging
In order to realize the positioning and blocking of particles in the cracks, it is necessary to inject a certain amount of bridging agent before injecting small particles, and filamentous fiber is a low-cost high-quality bridging agent, but the adhesion characteristics of the fiber itself and its electrostatic effect It has poor dispersibility in water or polymer solution, and it is difficult to use the carrier liquid to inject the fiber into the target layer

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Add 5g of polyamino acid ester to 78.65g of tap water and put it in a 60°C water bath for 15min to fully dissolve, then add 0.5g of starch, 5g of acrylamide, 0.3g of polyethylene glycol diacrylate, 0.05g of N,N-dimethylacrylic Amide and 0.5g potassium persulfate are placed in the above polyamino acid ester solution in sequence. After the agent is fully dissolved, mix 10g of polypropylene fiber with the above solution, stir evenly and place it in a 60°C water bath for 3 hours, and finally use a rotary cutter The fiber composite gel particles can be obtained by granulation, and the release time of the fiber is 22 hours in the simulated formation water with a salinity of 223,000 mg / L at 80°C-140°C.

Embodiment 2

[0036] Add 7g of polyamino acid ester to 70.42g of tap water and put it in a water bath at 60°C for 20min to fully dissolve, then add 0.5g of starch, 7g of acrylamide, 0.3g of polyethylene glycol diacrylate, 0.08g of N,N-dimethylacrylic Amide and 0.7g potassium persulfate were placed in the above polyamino acid ester solution in turn. After the agent was fully dissolved, 14g polypropylene fiber was mixed with the above solution, stirred evenly and placed in a water bath at 60°C for 5 hours. Finally, use a rotary cutter The fiber composite gel particles can be obtained by granulation, and the release time of the fiber is 97 hours in the simulated formation water with a salinity of 223,000 mg / L at 80°C-140°C.

Embodiment 3

[0038]Add 10g of polyamino acid ester to 67.85g of tap water and put it in a water bath at 60°C for 20min to fully dissolve, then add 1g of starch, 5g of acrylamide, 0.5g of polyethylene glycol diacrylate, 0.05g of N,N-dimethylacrylamide , 0.6g of potassium persulfate were placed in the above polyamino acid ester solution in turn, after the agent was fully dissolved, 15g of polypropylene fiber was mixed with the above solution, stirred evenly, placed in a water bath at 60°C for 4 hours, and finally made with a rotary cutter Fiber-composite gel particles can be obtained by granules, and the fiber release time is 64 hours in simulated formation water with a salinity of 223,000 mg / L at 80°C-140°C.

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Abstract

The invention discloses a fibrous composite gel particle bridging agent for fractured oil reservoirs and a preparation method thereof. The bridging agent is compounded by the following raw materials in parts by weight: 5-20 parts of polypropylene fiber, 5-15 parts of acrylamide 3-10 parts of polyamino acid ester, 0.2-1 part of potassium persulfate, 0.5-2.5 parts of starch, 0.1-0.5 part of polyethylene glycol diacrylate, 0.02-0.1 part of N,N-dimethylacrylamide, The balance is water. The bridging agent of the present invention is in the form of particles during the injection process, which is conducive to the migration of fibers to the target layer. In the formation, due to the influence of temperature and salinity, the gel particles degrade and release filamentous fibers, and the released fibers can achieve The purpose of bridging, thereby realizing the positioning plugging of fractured reservoirs by injecting small-sized particles.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a fibrous composite gel particle bridging agent for fractured oil reservoirs and a preparation method thereof. Background technique [0002] Fractured reservoirs are one of the main reservoirs of oil and natural gas. Due to the existence of fractures, serious water problems occurred in the early stages of reservoir development, resulting in huge losses. Therefore, the flow path adjustment measures to seal large water flow fractures and maintain small oil flow fractures are the key to improving the recovery of fractured reservoirs. At present, the blocking agents used in flow channel adjustment are mainly divided into two types: jelly type and particle type. The jelly tends to have weak adhesion with the rock wall in the fracture, so it cannot form an effective residence in the ideal plugging position, resulting in a large amount of plugging agent leakage and poor flow...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/512C09K8/44
CPCC09K8/5045C09K8/426C09K8/44C09K2208/18C09K2208/08
Inventor 陈立峰毛志强汤明光申金伟白英睿曾慧勇刘靓焦保雷钱真王代刚朱晓明付美龙左佳奇关灿华阮扬
Owner YANGTZE UNIVERSITY
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