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A kind of fracturing water-soluble aa-am-nvp-ngd tetrapolymer temporary plugging agent and its synthesis method

A AA-AM-NVP-NGD, tetrapolymer technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem of low temporary plugging strength, incomplete plugging removal, and reservoir damage. and other problems, to achieve good plugging performance, improve rigidity and stability, and improve temporary plugging strength.

Active Publication Date: 2022-03-18
SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently commonly used oil-soluble temporary plugging agents, acid-soluble temporary plugging agents and alkali-soluble temporary plugging agents are mainly composed of petroleum resin, calcium carbonate, and alkali-soluble organic matter. Low
[0005] (2) Poor plugging performance
However, the plugging removal performance of water-soluble temporary plugging agents is poor, and an external plugging removal agent (strong oxidant) is usually required, and there are often areas where the plugging removal agent cannot act, making the plugging removal incomplete, thus forming a long-term damage to the reservoir. harm

Method used

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  • A kind of fracturing water-soluble aa-am-nvp-ngd tetrapolymer temporary plugging agent and its synthesis method

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Experimental program
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Effect test

Embodiment

[0023] A water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent for fracturing, the temporary plugging agent is composed of acrylic acid (AA), acrylamide (AM), N-vinylpyrrolidone (NVP) and neopentyl di A tetrapolymer composed of alcohol diacrylate (NGD).

[0024] The mass percent of raw materials used in the temporary blocking agent is: 30%-40% of acrylic acid, 59.4%-68.0% of acrylamide, 0.5%-1.5% of N-vinylpyrrolidone, and 0.1%-0.5% of neopentyl glycol diacrylate.

[0025] In this embodiment, the synthetic method of water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent for fracturing comprises the following steps:

[0026] S1. Add 30-40 parts of acrylic acid, 59.4-68.0 parts of acrylamide, 0.5-1.5 parts of N-vinylpyrrolidone and 200-250 parts of deionized water into the reactor;

[0027] S2. Add sodium hydroxide solution to the mixed solution in step S1 to adjust the pH value to 7.0-7.5, then add 0.5-1.5 parts of neopentyl glycol diacrylate, and then a...

Embodiment 2

[0032] A kind of synthetic method of fracturing water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent

[0033] Material preparation: Weigh the main raw materials according to the table

[0034] raw material name the code Dosage (g) acrylic acid AAA 35 Acrylamide AM 63.8 N-vinylpyrrolidone NVP 1.0 Neopentyl glycol diacrylate NGD 0.2

[0035] The specific operation process is: add 220g of deionized water, 35g of acrylic acid, 63.8g of acrylamide, 1.0g of N-vinylpyrrolidone into a 1000ml reactor, adjust the pH value to 7.0-7.5 with sodium hydroxide solution, and then add 0.2g of neopentyl Glycol diacrylate, and then add a certain amount of deionized water to form an aqueous solution with a total monomer mass concentration of 25%, and pass nitrogen to remove oxygen; after the temperature of the aqueous solution reaches 45°C, add 0.3g of sodium bisulfite- Ammonium persulfate initiator (the molar ratio of sodium bisulfit...

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Abstract

The invention relates to the technical field of oilfield chemistry, and discloses a water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent for fracturing and a synthesis method thereof. The temporary plugging agent is mainly composed of raw material monomers with a mass percentage of 30 %-40% acrylic acid, 59.4%-68.0% acrylamide, 0.5%-1.5% N-vinylpyrrolidone and 0.1%-0.5% neopentyl glycol diacrylate. The present invention can improve the rigidity and stability of the temporary blocking agent molecular chain by introducing N-vinylpyrrolidone with a five-membered ring structure into the temporary blocking agent molecular chain, thereby improving the temporary blocking strength of the temporary blocking agent; will have Neopentyl glycol diacrylate with two carbon-carbon double bonds is used to synthesize a temporary plugging agent, which acts as a crosslinking agent, so that the temporary plugging agent becomes a water-swelling body after absorbing water, and can form a seal to the fracture; the The blocking removal mechanism of the temporary plugging agent is different from that of the current water-soluble temporary plugging agent. The plugging removal process does not require an external plugging removal agent, and only needs to be completely removed under the action of temperature and water, and the plugging removal performance is good.

Description

technical field [0001] The invention relates to the technical field of oilfield chemistry, in particular to a water-soluble AA-AM-NVP-NGD tetrapolymer temporary plugging agent for fracturing and a synthesis method thereof. Background technique [0002] In recent years, high-efficiency development technologies for low-permeability reservoirs have received widespread attention. A large number of low-permeability reservoirs have been discovered successively in Daqing Oilfield, Jilin Oilfield, Liaohe Oilfield, Shengli Oilfield, Changqing Oilfield and other major oilfields. Among the proven undeveloped petroleum geological reserves in recent years, low-permeability reserves with a permeability of less than 50 mD accounted for more than 58%; and among the proven petroleum geological reserves, low-permeability reservoirs accounted for The ratio is as high as 60%-70%. Therefore, it is of great significance to develop low-permeability reservoirs to ensure my country's energy securi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/06C08F226/10C08F222/14C09K8/508
CPCC08F220/56C09K8/5083C08F220/06C08F226/10C08F222/102
Inventor 覃孝平李翠霞
Owner SICHUAN UNIVERSITY OF SCIENCE AND ENGINEERING
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