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Temperature and salt-resistant AM/ACD/AE copolymer and its preparation method

A temperature-resistant, salt-resistant, copolymer technology, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as increasing the viscosity of the injection liquid, and achieve enhanced hydrophobic association, mild reaction conditions, and simple preparation methods. workable effect

Inactive Publication Date: 2011-11-02
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is: in order to overcome the increasing temperature of oil reservoirs and increasing formation salinity, the existing polymer oil displacement agent can not well meet the requirements of increasing the viscosity of injection fluid under high temperature and high salinity conditions, it is specially provided A temperature-resistant and salt-resistant AM / ACD / AE copolymer and its preparation method

Method used

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  • Temperature and salt-resistant AM/ACD/AE copolymer and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Example 1 The preparation method of AM / ACD / AE copolymer.

[0011] First use 140mL of deionized water to mix 7.1g of acrylamide AM, 13.1g of allyl cyclodextrin ACD and 0.698g of octylphenol polyoxyethylene methacrylate AE into three monomers with a monomer concentration of 15%. Solution, add this solution to a 250mL three-necked flask; then add 0.11mL of potassium persulfate with a concentration of 0.8g / mL and 0.11mL of sodium bisulfite with a concentration of 0.7g / mL in sequence, and stir the above mixed solution evenly, Fill it with nitrogen for 20 minutes to remove oxygen, and react at 45°C for 5 hours to obtain a colloidal product, which is washed 3 times with absolute ethanol until white precipitation appears. After drying in an oven at 50°C for 24 hours, an AM / ACD / AE copolymer is prepared.

[0012] Measure the intrinsic viscosity of the AM / ACD / AE copolymer according to the standard described in GB12005.1-89, and then measure the molecular weight of the copolymer accor...

Embodiment 2

[0013] Example 2 The temperature resistance effect of AM / ACD / AE copolymer.

[0014] In order to evaluate the temperature resistance of the AM / ACD / AE copolymer, the following experiment was done to prove it. The obtained product AM / ACD / AE copolymer and the purchased acrylamide polymer are respectively prepared into a salt solution with a concentration of 2000 mg / L. The specific process is as follows: First, prepare a NaCl solution with a concentration of 3000 mg / L with deionized water; Then use the prepared salt solution to make the above product AM / ACD / AE into a 2000mg / L copolymer aqueous solution; the purchased acrylamide polymer is also made into a 2000mg / L solution; finally, the two prepared above A solution, the change of apparent viscosity of the solution was measured at different temperatures, which proved that the AM / ACD / AE copolymer prepared by this invention has better temperature resistance than ordinary acrylamide polymers;

Embodiment 3

[0015] Example 3 The salt resistance effect of AM / ACD / AE copolymer.

[0016] In order to evaluate the salt resistance of the AM / ACD / AE copolymer, the following experiment was done to prove it. The obtained product AM / ACD / AE copolymer and the purchased acrylamide polymer are respectively formulated into a salt solution with a concentration of 2000mg / L. The specific process is as follows: Use deionized water to prepare a series of salt solutions with a concentration of NaCl. Different concentrations of salt solutions were prepared by mixing acrylamide polymer and AM / ACD / AE copolymer into a copolymer solution with a concentration of 2000mg / L. At a temperature of 25°C, the apparent viscosity changes of the two were measured. It is proved that the AM / ACD / AE copolymer prepared by this invention has better salt resistance than ordinary acrylamide polymers.

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Abstract

The invention relates to a temperature and salt-resistant AM / ACD / AE copolymer used as an oil displacement agent in the petroleum exploitation and a preparation method thereof. The temperature and salt-resistant AM / ACD / AE copolymer can meet the requirements of the injected liquid viscosity with the incessant increasing of the oil reservoir temperature and the stratum mineralization. The technical scheme of the invention is characterized in that the mole ratio of the raw materials used in the preparation of the copolymer comprises, by mole percentage, 88.2-91.4% of an AM monomer, 8-11% of an ACD monomer, 0.6-0.8% of an AE monomer, an oxidizing agent potassium persulphate which accounts for 0.3-0.5% of the total weight of the monomers, and a reducing agent sodium bisulfite which accounts for0.35-0.45% of the total weight of the monomers. The preparation method provided by the invention comprises the following steps of: adding AM, ACD and AE into a container, adding water to produce a solution at the concentration of 15%, dissolving with stirring, adding the oxidizing agent and the reducing agent with uniformly blending, deoxygenizing by filling nitrogen, reacting at the temperature of 40-50 DEG C for 4-5 hours, washing and drying to obtain the AM / ACD / AE copolymer. The preparation method provided by the invention is simple and feasible with mild reaction conditions; the product prepared by the method has inclusion and aggregation functions as well as temperature and salt-resistant performance, and can be used in tertiary oil extraction.

Description

technical field [0001] The invention relates to a temperature-resistant and salt-resistant AM / ACD / AE copolymer used as an oil displacement agent in the oil recovery industry and a preparation method thereof. Background technique [0002] EOR is an important method to enhance oil recovery for residual oil and remaining oil that cannot be recovered from secondary oil recovery. Among them, polymer flooding is a very important and large-scale technology in tertiary oil recovery in my country. Partially hydrolyzed polyacrylamide with high relative molecular weight is widely used as polymer flooding in tertiary oil recovery, which can increase the viscosity of oilfield injection fluid, adjust the water-oil mobility ratio, improve the heterogeneity of the reservoir, and increase the viscosity of the injection fluid. Contagion coefficient. However, there are some problems in the practical application of partially hydrolyzed polyacrylamide, such as poor temperature resistance and sa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/10C08F290/06C08F220/56C08B37/16C08G65/00C09K8/588
Inventor 邹长军赵品文葛菊
Owner SOUTHWEST PETROLEUM UNIV
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