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Polymer-type control and displacement agent suitable for high-temperature and high-salt severe oil reservoirs and preparation method thereof

A high-temperature, high-salt, polymer technology, used in drilling compositions, chemical instruments and methods, etc., can solve the problem of not being able to combine two into one, and achieve stable reaction, strong association, excellent temperature resistance and salt resistance. Effect

Active Publication Date: 2019-07-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] One of the technical problems to be solved by the present invention is that gel plugging agents in high-temperature, high-salt harsh oil reservoirs in the prior art are generally only used to improve the heterogeneity of the oil reservoir, and polymers are generally only used to improve oil-water flow. Degree ratio, the problem that the two cannot be combined into one

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] First add 2500g of deionized water to the reaction kettle, add 430g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 3.5g of sodium 2-acrylamidotetradecylsulfonate (NaAMC 14 S), 4.5g of acryloyloxyethyltrimethylammonium chloride (DAC), neutralized to neutral with NaOH, then added 0.04g of disodium edetate, 7g of urea, 0.07g of isopropanol, and stirred until completely dissolved. Adjust the pH value to 8.9 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 15°C, and then 10 g of 0.2% sodium bisulfite aqueous solution, 0.5% methacrylic acid N,N-di 10 g of methylaminoethyl ester (DMAEMA) aqueous solution, 10 g of 0.5% azobisisobutylamidine hydrochloride, 10 g of 0.3% potassium persulfate aqueous solution, continue to pass nitrogen gas for 30 minutes and then seal. After 1 hour, the reaction temperature was gradually raised to 52°C. After 3.5 hours of reaction, a gel-like polym...

Embodiment 2

[0050] First add 2600g of deionized water to the reaction kettle, add 480g of acrylamide (AM), 130g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 4.0g of 2-acrylamido sodium dodecylsulfonate (NaAMC 12 S), 7.8g methacryloyloxyethyltrimethylammonium chloride (DMC) and 5.0g nitrogen vinylpyrrolidone (NVP), neutralized to neutral with NaOH, then added disodium edetate 0.045 g, urea 7.0g, isopropanol 0.06g, stir until completely dissolved. Adjust the pH value to 9.0 with NaOH, and start feeding high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 16°C, and then 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl Aminoethyl ester (DA) aqueous solution 11g, 0.5% azobisisobutylamidine hydrochloride 11.9g, 0.3% potassium persulfate aqueous solution 11.2g, continue nitrogen gas for 30min and then seal. After 1 hour, the reaction temperature was gradually increased to 58°C. After 3 hours of reaction, a gel-like pol...

Embodiment 3

[0054] First add 2700g of deionized water to the reaction kettle, add 500g of acrylamide (AM), 150g of 2-acrylamido-2-methylpropanesulfonic acid (AMPS), 5.2g of sodium 2-acrylamido hexadecylsulfonate (NaAMC 16 S) and 9.4g dimethyl diallyl ammonium chloride (DMDAAC), neutralized to neutral with NaOH, then add disodium edetate 0.05g, urea 8.0g, isopropanol 0.07g, stir until completely dissolved. Adjust the pH value to 9.5 with NaOH, and start to feed high-purity nitrogen gas. After 30 minutes, the temperature in the kettle was lowered to 20°C, and then 10.2 g of 0.2% aqueous sodium bisulfite solution, 0.5% acrylic acid N,N-dimethyl 12.1 g of aminoethyl ester (DA) aqueous solution, 12 g of 0.5% 2,2'-azo[2-(2-imidazolin-2-yl) propane] dihydrochloride, 11 g of 0.3% potassium persulfate aqueous solution, Continue to pass nitrogen gas for 30 minutes before sealing. After 1 hour, the reaction temperature was gradually raised to 55°C. After 2.5 hours of reaction, a gel-like polymer ...

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Abstract

The invention relates to a polymer type profile control and oil displacement agent applicable to high-temperature high-salt harsh oil reservoirs and a preparation method thereof. The agent and the preparation method in the invention mainly overcome the problems that conventional gel type plugging agents can only improve heterogeneity of oil reservoirs normally, polymers are only used for improving oil-water mobility ratio normally, and the gel type plugging agents and the polymers cannot be integrated. According to the invention, a hydrophobic associated polymer with a special structure is employed and compounded with certain surfactants in a certain ratio; the association strength and viscosity of the polymer can be adjusted according to on-site conditions of formations of oil reservoirs, so the polymer performs the dual effects of profile control and oil displacement. The polymer type profile control and oil displacement agent comprises, by weight, 0.05 to 1.0 part of the hydrophobic associated polymer with the special structure, 0.05 to 1.0 part of a surfactant and 99 to 99.95 parts of water. The polymer type profile control and oil displacement agent provided by the invention overcomes the above problem; and the preparation method is used for industrial production and application of the polymer type profile control and oil displacement agent applicable to high-temperature high-salt harsh oil reservoirs.

Description

technical field [0001] The invention relates to a polymer-type control and displacement agent suitable for high-temperature and high-salt harsh oil reservoirs and a preparation method thereof. Background technique [0002] After primary and secondary oil recovery in major domestic oil fields, the water content of crude oil continues to increase, and some large oil fields have entered the stage of tertiary oil recovery. Many oilfields have been exploited for a long time, and the current crude oil production is declining year by year. In order to stabilize production, in some later stages, strong mining and injection methods were adopted, resulting in the formation of many large tunnels underground. Reservoir heterogeneity and unfavorable mobility ratio are two important factors affecting the sweep efficiency and ultimate recovery of water flooding reservoirs. For the above-mentioned problems in water flooding reservoirs, profile control and water plugging are more effective...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F220/58C08F220/34C08F2/38C09K8/588
CPCC08F2/38C08F220/56C09K8/588C08F220/585C08F220/34
Inventor 夏燕敏许汇苏智青宋晓芳
Owner CHINA PETROLEUM & CHEM CORP
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