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Combined gas hydrate inhibitor and preparation method thereof

A gas hydrate, combined technology, applied in drilling compositions, chemical instruments and methods, gas/liquid distribution and storage, etc., can solve the problems of high cost, poor gas hydrate inhibitor effect, etc. Low cost, extended generation time, cost reduction effect

Inactive Publication Date: 2018-04-13
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a high-efficiency, energy-saving and low-cost combined hydrate inhibitor for the problems of poor effect and high cost of existing gas hydrate inhibitors

Method used

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  • Combined gas hydrate inhibitor and preparation method thereof
  • Combined gas hydrate inhibitor and preparation method thereof
  • Combined gas hydrate inhibitor and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The selected inhibitor ratio is 0.1% polyvinyl caprolactam + 1% ethylene glycol, and the experimental gas is CO 2 , the inhibitor concentration in the aqueous solution is 200-600ppm, and the temperature is 3.5°C. Experiments were carried out with the above method, and the experimental data are shown in Table 1.

[0036] Table 1 Experimental results

[0037]

Embodiment 2

[0039] The selected inhibitor ratio is 0.3% polyvinyl caprolactam + 2.5% ethylene glycol, and the experimental gas is CO 2 , the inhibitor concentration in the aqueous solution is 200-600ppm, and the temperature is 3.5°C. Experiments were carried out with the above method, and the experimental data are shown in Table 2.

[0040] Table 2 Experimental results

[0041]

Embodiment 3

[0043] The selected inhibitor ratio is 0.3% polyvinyl caprolactam + 2.5% potassium nitrate, and the experimental gas is CO 2 , the inhibitor concentration in the aqueous solution is 200-600ppm, and the temperature is 3.5°C. Experiments were carried out with the above method, and the experimental data are shown in Table 3.

[0044] Table 3 Experimental results

[0045]

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PUM

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Abstract

The invention discloses a combined gas hydrate inhibitor and a preparation method thereof, and relates to the technical field of utilization and transportation of oil gas hydrates. The combined gas hydrate inhibitor comprises, by mass, 0.1-0.5% of polyvinyl caprolactam, 1-5% of an alcohol or a salt, and the balance of deionized water, wherein the alcohol is ethylene glycol, and the salt is potassium acetate or potassium nitrate. The addition of a certain amount of the salt or the alcohol to existing dynamics inhibitors prolongs the generation time of hydrates, reduces the generation amount ofthe hydrates, and greatly improves the inhibition effect of the dynamics inhibitor to make the dynamics inhibitor have the advantages of good effect, good stability and wide application range.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrate utilization and transportation, in particular to a combined hydrate inhibitor and its preparation method and application. Background technique [0002] Gas hydrate is a cage structure formed by water molecules connected by hydrogen bonds, and small gas molecules are surrounded in the cage structure by van der Waals force to form an ice-like compound. During the extraction and transportation of oil and natural gas, due to its special high-pressure and low-temperature environment, various low-boiling hydrocarbon gases (such as methane, ethane, propane) and non-hydrocarbon gases (carbon dioxide, hydrogen sulfide) are easily It will form gas hydrate with water in petroleum fluid, and then gradually form a block, which will block pipelines, wellbore, valves, instruments and other equipment in severe cases, which poses a great threat to the production, storage and transportation of oil and g...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524C09K8/528F17D1/02F17D1/16
CPCC09K8/524C09K8/528C09K2208/22F17D1/02F17D1/16
Inventor 饶永超才政王树立周诗岽李恩田赵书华梁俊蔡跃跃葛昊
Owner CHANGZHOU UNIV
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