Temperature-resistant and salt-resistant hydrophobic association polymer preparation method

A hydrophobic association, temperature-resistant and salt-resistant technology, applied in the direction of drilling compositions, chemical instruments and methods, can solve the problem of rising temperature and salinity, which cannot meet the requirements of high-temperature and high-salt reservoirs, and harsh reservoir environments Adaptability and other issues, to achieve the effect of promoting intermolecular association, improving temperature and salt resistance performance, and improving temperature and salt resistance performance

Inactive Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, as the difficulty of oil reservoir development increases, the temperature and salinity increase accordingly, and the original polymer products can no longer meet the requirements of high-temperature and high-salt oil reservoirs, mainly in terms of viscosity increasing, long-term stability, economic and the adaptability to harsher reservoir environments need to be further improved

Method used

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  • Temperature-resistant and salt-resistant hydrophobic association polymer preparation method
  • Temperature-resistant and salt-resistant hydrophobic association polymer preparation method
  • Temperature-resistant and salt-resistant hydrophobic association polymer preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Put 96.48kg of deionized water into the polymerization kettle, add 0.0025kg of disodium edetate, 25kg of acrylamide, 0.5kg of DiC 8 AM, 30% AMPS-Na solution 1.25kg, 0.0125kg OP-10, 0.5kg thiourea, 0.0025kg sodium acetate and 1.25kg potassium chloride, stir evenly, after each component is fully dissolved, cool down to 10°C; High-purity nitrogen for 1 hour, then add 0.125kg of 2% ammonium persulfate solution, 0.625kg of 2% sodium sulfite solution and 1.25kg of 2% azobisisobutylamidine hydrochloride solution, and carry out low temperature in the temperature range of 5-10°C Initiate polymerization, when the temperature rises to 30-35°C, azobisisobutylamidine hydrochloride decomposes, automatically initiates the polymerization reaction at high temperature, and the total polymerization reaction is 6h; take out the colloid for granulation, and then add 2.5kg hydrogen Sodium oxide is hydrolyzed for 2 hours, dried at 90°C for 3 hours, then crushed and packaged to obtain a temper...

Embodiment 2

[0038] Put 55.33kg of deionized water into the polymerization kettle, add 0.125kg of disodium edetate, 25kg of acrylamide, 2kg of DiC 8 AM, 30% AMPS-Na solution 5kg, 0.05kgTX, 1.5kg urea, 0.03kg isopropanol and 0.25kg potassium sulfate, stir evenly, after each component is fully dissolved, cool down to 8°C; inject high-purity nitrogen for 1.5h , then add 0.625kg of 2% potassium persulfate solution, 2.5kg of 2% ethylenediamine solution and 1.25kg of 2% azobisisobutyronitrile solution, and initiate polymerization at a temperature of 5-10°C at a low temperature. When the temperature reaches 55-60°C, azobisisobutyronitrile decomposes, automatically triggers the polymerization reaction at high temperature, and the total polymerization reaction is 7 hours; take out the colloid for granulation, then add 3kg of sodium hydroxide for hydrolysis for 4 hours, then place it at 110°C Dry for 2 hours, then pulverize and pack to obtain a temperature-resistant and salt-resistant associative po...

Embodiment 3

[0040] Put 67.22kg of deionized water into the polymerization kettle, add 0.01kg of disodium edetate, 25kg of acrylamide, 0.75kg of DiC 8 AM, 30% AMPS-Na solution 4.2kg, 0.03kg Tween 20, 0.75kg urea, 0.015kg sodium formate and 0.25kg potassium chloride, stir evenly, after each component is fully dissolved, cool down to 10°C; Pure nitrogen for 60 minutes, then add 0.25kg of 2% potassium persulfate solution, 1.25kg of 2% sodium sulfite solution and 0.25kg of 2% azobisisobutylamidine hydrochloride solution, and conduct low-temperature initiation at a temperature range of 5-10°C Polymerization, when the temperature rises to 40-45°C, azobisisobutylamidine hydrochloride decomposes to initiate a polymerization reaction at a high temperature range, and the total polymerization reaction is 5 hours; take out the colloid for granulation, and then add 2.7kg of sodium hydroxide for hydrolysis After 1.5 hours, it is dried, pulverized and packaged to obtain a temperature-resistant and salt-r...

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Abstract

The present invention provides a temperature-resistant and salt-resistant hydrophobic association polymer preparation method, which comprises: (1) sequentially adding deionized water, disodium ethylenediaminetetraacetate, an acrylamide monomer, N,N-dioctylacrylamide, 2-acrylamido-2-methylpropanesulfonic acid, a surfactant, a co-solvent, a chain transfer agent and an inorganic salt to a polymerization kettle, uniformly stirring, and cooling to a temperature of 5-10 DEG C under the action of frozen salt water; (2) introducing high purity nitrogen for 1-2 h, adding a multi-stage composite initiator, carrying out an adiabatic polymerization reaction for 5-7 h, taking out a colloid, and granulating; and (3) adding a hydrolysis agent, carrying out hydrolysis for 2-4 h at a temperature of 90-110 DEG C, and drying for 2-3 h at a temperature of 90-110 DEG C to obtain the temperature-resistant and salt-resistant hydrophobic association polymer. According to the present invention, the prepared temperature-resistant and salt-resistant hydrophobic association polymer has advantages of good tackifying property, good temperature resistance, good salt resistance, good shearing resistance, good long-term stability, and high oil displacement efficiency.

Description

technical field [0001] The invention belongs to the field of preparation of hydrophobic association water-soluble polymers, in particular to a method for preparing a temperature-resistant and salt-resistant hydrophobic association polymer. Background technique [0002] Hydrophobically Associating Water-Soluble Polymers (HAWSP) refers to a water-soluble polymer with a small amount of hydrophobic groups on the hydrophilic macromolecular chain of the polymer (E.Volpert, J.Selb , F. Candau. Adsorption of Hydrophobically Associating Polyacrylamides on Clay. Langmuir, 1998, 14(7): 1870-1879.). In aqueous solution, hydrophobic groups aggregate due to hydrophobic association, causing macromolecular chains to generate intramolecular and intermolecular associations, and when the critical association concentration is above the critical association concentration, a superstructure with intermolecular associations as the main behavior is formed. Molecular chain aggregates significantly i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/56C08F220/54C08F220/58C08F4/40C09K8/588
Inventor 孙焕泉郭拥军李振泉曹绪龙宋新旺张继超刘坤韩玉贵李华兵冯茹森
Owner CHINA PETROLEUM & CHEM CORP
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