A kind of weakly cross-linked granular control and drive agent for enhancing oil recovery and its preparation method

A recovery factor and flood control agent technology, which is applied in the field of weakly cross-linked particle control and flooding agent and its preparation, can solve the problems of poor adaptability to heterogeneous formations, decreased viscosity, high cross-linking degree, etc., and achieve a dense cross-linked network structure , improved aging resistance, simple synthesis method

Active Publication Date: 2017-11-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, under the conditions of high temperature, high salinity and severe heterogeneity, linear polyacrylamide ages seriously, its viscosity drops sharply, and it has poor adaptability to heterogeneous formations, making it difficult to meet the requirements of enhanced oil recovery; in addition, it can effectively adjust Profile control and water shutoff agent for heterogeneous reservoir permeability, due to high degree of cross-linking, high hardness, poor deformability, difficult to migrate in pores, can not play the role of oil displacement agent

Method used

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  • A kind of weakly cross-linked granular control and drive agent for enhancing oil recovery and its preparation method
  • A kind of weakly cross-linked granular control and drive agent for enhancing oil recovery and its preparation method
  • A kind of weakly cross-linked granular control and drive agent for enhancing oil recovery and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Dissolve 25 parts of acrylamide in 62 parts of water to make a solution, dissolve 0.05 part of dimethylaminoethyl methacrylate in 8 parts of water to make a solution, and dissolve 0.00025 parts of polyethylene glycol diacrylate in 5 parts of water to make a solution , added to the three-necked flask in turn, and placed in a water bath at 15°C; after passing through nitrogen for 30 minutes, a solution prepared by dissolving 0.0025 parts of ammonium persulfate in 12 parts of water was added to the three-necked flask. After the temperature rise of the reaction solution is greater than 1°C, stop the nitrogen flow. After the reaction, put the three-neck bottle in a 75°C water bath to keep warm for 4 hours, then take out the gel, cut it into pieces, dry it, crush it, and sieve it. Powdered product available.

Embodiment 2

[0027] Dissolve 50 parts of acrylamide in 100 parts of water to make a solution, dissolve 0.15 parts of dimethylaminoethyl methacrylate in 20 parts of water to make a solution, and dissolve 0.00025 parts of polyethylene glycol diacrylate in 15 parts of water to make a solution , added to the three-necked flask in turn, and placed in a water bath at 12°C; after passing through nitrogen for 30 minutes, a solution prepared by dissolving 0.01 parts of ammonium persulfate in 25 parts of water was added to the three-necked flask. After the temperature rise of the reaction solution is greater than 1°C, stop the nitrogen flow. After the reaction, put the three-neck bottle in a 70°C water bath to keep warm for 6 hours, then take out the gel, cut it into pieces, dry it, crush it, and sieve it. Powdered product available.

Embodiment 3

[0029] Dissolve 100 parts of acrylamide in 250 parts of water to make a solution, dissolve 0.4 parts of dimethylaminoethyl methacrylate in 40 parts of water to make a solution, and dissolve 0.0008 parts of polyethylene glycol diacrylate in 20 parts of water to make a solution , into the three-necked flask in turn, and placed in a water bath at 12°C; after 30 minutes of nitrogen gas, a solution prepared by dissolving 0.02 parts of ammonium persulfate in 30 parts of water was added to the three-necked flask. When the temperature rise of the reaction solution is greater than 1°C, stop the nitrogen flow. After the reaction, put the three-neck bottle into an 80°C water bath to keep warm for 3 hours, then take out the gel, cut it into pieces, dry it, crush it, and sieve it. Powdered product available.

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Abstract

The invention provides a novel weakly cross-linked particle control and displacement agent capable of enhancing oil recovery and a preparation method thereof. The drive control agent is formed by polymerization of acrylamide monomer and composite crosslinking system through an initiator. Its preparation method is: dissolve 100 parts of acrylamide in 200-250 parts of water to make a solution, dissolve 0.2-0.5 parts of dimethylaminoethyl methacrylate in 30-50 parts of water to make a solution, and dissolve 0.0002-0.001 parts of polyethylene Diol diacrylate is dissolved in 20~40 parts of water to form a solution, which is added to the three-necked bottle in turn, and placed in a water bath at 10°C~15°C; after 30 minutes of nitrogen gas, dissolve 0.01-0.03 parts of ammonium persulfate Add the solution prepared in 30~50 parts of water into the three-necked bottle. After the temperature rise of the reaction solution is greater than 1°C, stop the nitrogen flow. After the reaction, put the three-neck bottle into a water bath at 70-85°C to keep warm for 2-6 hours, then take out the gel, cut it into pieces, dry, pulverize, The powdered product can be obtained after sieving.

Description

technical field [0001] The invention relates to the technical field of tertiary oil recovery, in particular to a weakly cross-linked particle control and displacement agent capable of enhancing oil recovery and a preparation method thereof. Background technique [0002] At present, most oilfields in my country have entered the middle and late stages of secondary recovery. After long-term water injection development, the reservoir geology has become more complicated, and the heterogeneity has become more serious. During the water cut period, the oil saturation has been greatly reduced. Therefore, it is difficult to extract 60-70% of the remaining underground crude oil by means of conventional methods of increasing production and increasing injection. The difficulty of mining technology is becoming more and more difficult, and the economic benefits are getting worse and worse. Tertiary oil recovery technology has become an important means of improving oil recovery. Linear poly...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/56C08F220/34C09K8/588
Inventor 李振泉曹绪龙姜祖明宋新旺陈晓彦王红艳刘煜
Owner CHINA PETROLEUM & CHEM CORP
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