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High efficient hydrate inhibitor and its preparation method

A hydrate inhibitor and inhibitor technology, applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of accelerated corrosion, flammability, and environmental pollution of drilling equipment

Inactive Publication Date: 2012-06-13
CHINA UNIV OF PETROLEUM (EAST CHINA)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Drilling fluid with high salt content will accelerate the corrosion of drilling equipment, and as the salt content increases, the performance maintenance and regulation of drilling fluid becomes more difficult
The industrial cost of methanol and ethylene glycol is high, toxic and flammable. Due to the high consumption, the corresponding storage and injection equipment is huge, and it is difficult to recycle, facing the problem of environmental protection
The second is the kinetic inhibitor, although the dosage is small, but the existing kinetic inhibitor is limited by the degree of supercooling, and the inhibitory effect is limited
It not only causes huge economic losses, but also produces serious environmental pollution, which seriously threatens the life of marine organisms. Therefore, hydrates have become a major threat to the oil and gas industry

Method used

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  • High efficient hydrate inhibitor and its preparation method
  • High efficient hydrate inhibitor and its preparation method
  • High efficient hydrate inhibitor and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] To a four-necked flask equipped with a reflux condenser, a thermometer, a stirrer and a nitrogen inlet and outlet, add 200mL of methanol, then add 18.0g of vinyl caprolactam and 14.4g of vinylpyrrolidone, stir and heat through nitrogen to a temperature of 60°C, add 0.32 g of azobisisobutyronitrile. The aqueous solution containing 7.0 g of vinyl sulfonic acid was added dropwise into the four-necked flask, and the dropwise addition was completed within 2 hours, and the reaction was carried out at 60° C. for 8 hours. Add 4.2 g of isopropyl methacrylamide and react at 60° C. for 6 hours to obtain a reaction product. The product was precipitated into excess hexane, redissolved in tetrahydrofuran, reprecipitated into hexane, and dried in vacuo to obtain a sample of the inhibitor.

Embodiment 2

[0027] To a four-neck flask equipped with a reflux condenser, a thermometer, a stirrer and a nitrogen inlet and outlet, add 200mL of methanol, then add 15.2g of vinyl caprolactam and 12.1g of vinylpyrrolidone, stir and heat through nitrogen to a temperature of 60°C, add 0.30 g of azobisisobutyronitrile. An aqueous solution containing 11.3 g of 2-acrylamide-2-methylpropanesulfonic acid was added dropwise to a four-necked flask, and the dropwise addition was completed within 2 hours, followed by a reaction at 60°C for 8 hours. Add 3.1 g of isopropylacrylamide and react at 60° C. for 6 hours to obtain a reaction product. The product was precipitated into excess hexane, redissolved in tetrahydrofuran, reprecipitated into hexane, and dried in vacuo to obtain a sample of the inhibitor.

[0028] Evaluation of the effect of inhibitors:

[0029] The present invention uses a natural gas hydrate inhibitor performance evaluation experimental device as the experimental equipment, which...

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Abstract

The invention provides a high efficient hydrate inhibitor and its preparation method. The hydrate inhibitor of the present invention is a copolymer generated by reacting vinyl caprolactam, vinyl pyrrolidone, allyl sulphonic acid and N-substituted acrylamide. The hydrate inhibitor has the advantages of low dosage and good inhibition performance, and can be individually used, as well as can be used with salt, alcohol and its mixture, the inhibitor of the invention is capable of preventing the hydrate formation of deepwater drilling fluid under low temperature condition, and can acquire the effects of low dosage and good inhibition performance.

Description

technical field [0001] The invention relates to the technical field of hydrate inhibitors, in particular to hydrate inhibitors used in deep water drilling. Background technique [0002] The harsh environment and complex operating conditions of marine deepwater operations have brought many new problems and challenges to oil and gas production, one of which is the formation of gas hydrates. Under deep water conditions, the degree of compaction in shallow formations is low, and there is a large amount of shallow gas and gas hydrates. When drilling into shallow gas formations, the gas in the formations enters the drilling fluid and easily forms hydration under low temperature and high pressure environments. thing. Once natural gas hydrate is formed in the drilling fluid, it will block the downhole blowout preventer, blowout valve, etc., and it is not easy to remove, resulting in prolonged drilling cycle and increased drilling cost. On the other hand, during the drilling proces...

Claims

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Application Information

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IPC IPC(8): C09K8/524
Inventor 江琳邱正松徐加放孔祥云赵欣黄维安曹杰
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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