A branched viscoelastic powder oil displacement agent and its preparation method

A powdery, oil-displacing agent technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problems of low recovery rate of oil-displacement, low volume of oil-displacing agent, etc., and achieve stable product performance and Excellent, small amount of initiator, easy to control the effect

Active Publication Date: 2017-09-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, most oilfields in my country have entered the development stage of high water cut or extremely high water cut. The traditional oil displacement agent, partially hydrolyzed polyacrylamide, is injected into the reservoir and advances along the high permeability layer or belt, and few enter the low permeability layer. The volume of the oil displacement agent is swept Therefore, a partially cross-linked polyacrylamide viscoelastic particle oil displacement agent containing a large number of branched chain structures was developed.

Method used

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  • A branched viscoelastic powder oil displacement agent and its preparation method
  • A branched viscoelastic powder oil displacement agent and its preparation method
  • A branched viscoelastic powder oil displacement agent and its preparation method

Examples

Experimental program
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Effect test

Embodiment 1

[0022] a. Dissolve 100g of acrylamide in 200g of water to prepare an aqueous solution of acrylamide;

[0023] b. First, put the acrylamide aqueous solution in step a into a three-neck container, put nitrogen in a water bath at 15°C for 15 minutes, and then put the persulfide aqueous solution prepared according to the ratio of potassium persulfate: water = 0.04g: 40g Add the pentaerythritol aqueous solution prepared according to the ratio of pentaerythritol: water = 0.004g: 40g into the three-neck container for reaction. After the temperature rise of the reaction solution exceeds 1°C, stop the nitrogen flow and start recording the temperature of the reaction system;

[0024] c. When the temperature of the reaction system does not rise any more, put the three-necked container into an 85°C water bath and keep it warm for 4 hours, then take out the gel, cut it into pieces, dry it, and pulverize it to obtain a viscoelastic powder oil displacing agent product. After screening, the p...

Embodiment 2

[0026] a. Dissolve 100g of acrylamide in 250g of water to prepare an aqueous solution of acrylamide;

[0027] b. First, put the acrylamide aqueous solution in step a into a three-neck container, put nitrogen in a water bath at 10°C for 30 minutes, and then add the persulfide aqueous solution prepared according to the ratio of potassium persulfate: water = 0.04g: 40g Add the pentaerythritol aqueous solution prepared according to the ratio of pentaerythritol: water = 0.004g: 40g into the three-neck container for reaction. After the temperature rise of the reaction solution exceeds 1°C, stop the nitrogen flow and start recording the temperature of the reaction system;

[0028] c. When the temperature of the reaction system no longer rises, put the three-necked container in a 70°C water bath and keep it warm for 6 hours, then take out the gel, cut it into pieces, dry it, and pulverize it to obtain a viscoelastic powder oil displacing agent product. After screening, the product of ...

Embodiment 3

[0030] a. Dissolve 100g of acrylamide in 220g of water to prepare an aqueous solution of acrylamide;

[0031] b. First, put the acrylamide aqueous solution in step a into a three-neck container, put nitrogen in a water bath at 12°C for 20 minutes, and then add the persulfide aqueous solution prepared according to the ratio of potassium persulfate: water = 0.025g: 60g Add the pentaerythritol aqueous solution prepared according to the ratio of pentaerythritol: water = 0.0030g: 50g into the three-necked container for reaction. After the temperature rise of the reaction solution exceeds 1°C, stop the nitrogen flow and start recording the temperature of the reaction system;

[0032] c. When the temperature of the reaction system no longer rises, put the three-neck container in a 78°C water bath and keep it warm for 5 hours, then take out the gel, cut it into pieces, dry it, and pulverize it to obtain a viscoelastic powder oil displacing agent product. After screening, the product o...

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Abstract

The present invention provides a branched viscoelastic powder oil displacement agent and its preparation method. The method is carried out as follows: a. Acrylamide aqueous solution is prepared according to the ratio of acrylamide: water = 100:200-250 parts by weight; b. First take the acrylamide aqueous solution in step a and put it into a three-neck container, and in a water bath at 10°C to 15°C, blow nitrogen gas for 15 to 30 minutes. The persulfide aqueous solution prepared according to the ratio and the polyhydroxy compound aqueous solution prepared according to the ratio of polyol: water = 0.0018 to 0.004: 40 to 60 parts by weight are added to a three-neck container for reaction, and after the temperature of the reaction solution exceeds 1 °C , stop the nitrogen flow, and start to record the temperature of the reaction system; c. When the temperature of the reaction system no longer rises, put the three-neck container in a water bath at 70-85°C and keep it warm for 4-6 hours, then take out the gel, dry it, Pulverize to obtain viscoelastic powder oil displacement agent products.

Description

Technical field: [0001] The invention relates to the technical field of tertiary oil recovery, in particular to a branched viscoelastic powder oil 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 development stage of high water cut or extremely high water cut. The traditional oil displacement agent, partially hydrolyzed polyacrylamide, is injected into the reservoir and advances along the high permeability layer or belt, and few enter the low permeability layer. The volume of the oil displacement agent is swept Therefore, a partially cross-linked polyacrylamide viscoelastic particle oil displacement agent with a large number of branched chain structures was developed. Patent CN101775275B discloses a viscoelastic particle oil displacement agent and its preparation method. Dimethylaminoethyl methacrylate is used as a functional monomer in combination wi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F120/56C08F4/40C09K8/588
Inventor 曹绪龙李振泉姜祖明郭兰磊祝仰文王红艳陈晓彦刘煜李宗阳
Owner CHINA PETROLEUM & CHEM CORP
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