High-strength temperature resistant viscoelastic polymer for profile control

A polymer, high-strength technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as shear sensitivity, and achieve the effects of low environmental toxicity, excellent stability, and easy industrial production.

Active Publication Date: 2014-07-09
大庆高新区华龙祥化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, polyacrylamide is known to be shear sensitive, and the shear gradient in a continuous shear environment can prevent the mixture from gelling. Some oilfield gel operations fail due to the high shear gradient of the polymer and the high rate of adsorption of the polymer on the reservoir rock. Caused

Method used

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  • High-strength temperature resistant viscoelastic polymer for profile control
  • High-strength temperature resistant viscoelastic polymer for profile control
  • High-strength temperature resistant viscoelastic polymer for profile control

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Solution preparation: Add 525.2g of deionized water into a beaker, add 168g of 2-acrylamido-2-methyl-1-propanesulfonic acid monomer and 92g of 2-acrylamido dodecanesulfonic acid in sequence, and stir well Use sodium hydroxide to adjust the pH value to about 6.5, add 195g of acrylamide, 5g of fluorine-containing methyl acrylate, 2g of N-vinylacetamide, dimethyl[2-(methacryloyloxy)ethyl][3 -(Trimethoxysilylpropyl)] ammonium chloride 12g, ammonium carbonate 0.8g, stir evenly, and adjust the temperature between 13±1°C.

[0047] Polymerization of the solution: Blow nitrogen to remove oxygen for 30-40 minutes, add the initiator ammonium persulfate, pass nitrogen for 15 minutes, add the initiator sodium formaldehyde bisulfite, continue to pass nitrogen, when the temperature rises by 2°C during the induction period, stop nitrogen, After 5 hours of reaction, shear, dry, and granulate to obtain the finished product.

Embodiment 2

[0049] Preparation of the solution: Add 320g of deionized water into a beaker, add 550g of 2-acrylamido-2-methyl-1-propanesulfonic acid monomer, 20g of 2-acrylamido dodecanesulfonic acid in turn, stir well and use Adjust the pH value to about 6.5 with sodium hydroxide, add 50g of acrylamide, 30g of fluorine-containing methyl acrylate, dimethyl[2-(methacryloyloxy)ethyl][3-(trimethoxysilylpropyl)] Ammonium chloride 50g, ammonium carbonate 0.1g, stir evenly and adjust the temperature between 13±1°C.

[0050] Polymerization of the solution: Blow nitrogen to remove oxygen for 30-40 minutes, add the initiator ammonium persulfate, pass nitrogen for 15 minutes, add the initiator sodium formaldehyde bisulfite, continue to pass nitrogen, when the temperature rises by 2°C during the induction period, stop nitrogen, After 5 hours of reaction, shear, dry, and granulate to obtain the finished product.

Embodiment 3

[0052] Preparation of the solution: Add 250g of deionized water into a beaker, add 50g of 2-acrylamido-2-methyl-1-propanesulfonic acid monomer, 150g of 2-acrylamido dodecanesulfonic acid in turn, stir well and use Adjust the pH value to about 6.5 with sodium hydroxide, add 600g of acrylamide, 20g of dimethyl[2-(methacryloyloxy)ethyl][3-(trimethoxysilylpropyl)]ammonium chloride, and ammonium carbonate 10g, stir evenly and adjust the temperature between 13±1°C.

[0053]Polymerization of the solution: Blow nitrogen to remove oxygen for 30-40 minutes, add the initiator ammonium persulfate, pass nitrogen for 15 minutes, add the initiator sodium formaldehyde bisulfite, continue to pass nitrogen, when the temperature rises by 2°C during the induction period, stop nitrogen, After 5 hours of reaction, shear, dry, and granulate to obtain the finished product.

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Abstract

A high-strength temperature-resistant viscoelastic polymer for profile control, which is characterized in that the proportion of the polymer is: the proportion of each raw material in parts by mass, 5-60 parts of acrylamide; 2-acrylamide-2-methyl- 5-55 parts of 1-propanesulfonic acid; 2-15 parts of 2-acrylamido dodecanesulfonic acid; 0-3 parts of acrylate; 0-3 parts of N-vinylamide; 1-5 parts of cationic monomer; 0.01-1 part of solubilizing agent; 25-55 parts of deionized water; the present invention has the following advantages: one is classic reaction: it is easy to realize industrial production; the other is higher yield: the total yield reaches more than 90%; The synthetic raw materials and process routes of polymer-like polymers are environmentally friendly, have low environmental toxicity, good biodegradability, excellent salt resistance, and temperature resistance. Stability is better than ordinary polymers.

Description

technical field [0001] The invention relates to a polymer for oilfield water shutoff and profile control, in particular to a high-strength temperature-resistant viscoelastic polymer for profile control. Background technique [0002] In the process of oilfield water injection development, due to the heterogeneity of the formation and the complexity of the reservoir formation in the oilfield developed by water injection, as the water injection volume increases, the inhomogeneity of the water injection profile increases, and the movement of water in the reservoir is along the resistance. The smallest path advances, resulting in a large amount of water from the oil well, which reduces the efficiency of water injection and oil recovery. At present, most domestic oil fields have entered the middle and late stage of development, which is a high water cut period or an excessively high water cut period, and the main oil layers have been flooded in large areas. [0003] For a long ti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F226/02C08F220/34C08F230/08C09K8/588
Inventor 孙安顺
Owner 大庆高新区华龙祥化工有限公司
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