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Compounding type natural gas hydrate inhibitor

A technology of hydrate inhibitor and natural gas, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of inability to be applied on a large scale and insufficient suppression ability, and achieve low cost, prolong generation time, and improve suppression performance Effect

Inactive Publication Date: 2016-12-07
NORTHWEST UNIV(CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Kinetic inhibitors have the advantages of small dosage and high performance, but in the face of complex on-site working conditions in oil and gas fields, they still show insufficient inhibitory ability and cannot be applied to actual production on a large scale

Method used

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  • Compounding type natural gas hydrate inhibitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Based on the quality of water in the system, a composite hydrate inhibitor containing poly(vinyl caprolactam-benzyl methacrylate) copolymer with a mass concentration of 1% and methanol with a mass concentration of 5% was prepared, and then a certain amount of THF was added to make it The concentration is 19wt%, and the performance evaluation is carried out by THF method. Under normal pressure, the reaction temperature was maintained at 0°C, the stirring speed was kept consistent in each experiment, and the inhibition time was greater than 75h.

Embodiment 2

[0037] Based on the quality of water in the system, a compound hydrate inhibitor containing 3% poly(vinyl caprolactam-benzyl methacrylate) copolymer mass concentration and 5% ethylene glycol butyl ether mass concentration was prepared, and then a certain amount of THF, so that the concentration of 19wt%, using the THF method for performance evaluation. Under normal pressure, the reaction temperature was maintained at 0°C, the stirring speed was kept consistent in each experiment, and the inhibition time was longer than 65h.

Embodiment 3

[0039] Based on the quality of water in the system, a composite hydrate inhibitor containing 3% poly(vinyl caprolactam-benzyl methacrylate) copolymer mass concentration and 5% ethylene glycol mass concentration was prepared, and then a certain amount of THF was added, The concentration was adjusted to 19 wt%, and performance evaluation was performed by the THF method. Under normal pressure, the reaction temperature was maintained at 0°C, the stirring speed was kept consistent in each experiment, and the inhibition time was longer than 55h.

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Abstract

The invention discloses a compounding type natural gas hydrate inhibitor composition. The compounding type natural gas hydrate inhibitor composition consists of a polymer as shown in a structural formula (I) and a thermodynamic inhibitor, wherein the mass ratio of the polymer to the thermodynamic inhibitor is (1 to 1) to (1 to 10), R1 is C1-C10 alkyl groups, naphthenic groups and arene, and the thermodynamic inhibitor is selected from methanol, ethanol, glycol, butanol, ethylene glycol monobutyl ether, butyldiglycol, 2-phenoxyethanol and polyethylene glycol. The compounding type natural gas hydrate inhibitor composition disclosed by the invention is low in cost, selected compounding agents are some cheap and readily-available alcohol, ether and the like, the addition quantity is small, and the cost for restraining the generation of hydrate in oil gas trade is greatly reduced.

Description

technical field [0001] The invention relates to a high-efficiency compound hydrate inhibitor, which belongs to the technical field of oil and gas field additives. technical background [0002] In oil and gas extraction and transportation, especially under low temperature and high pressure conditions, gas molecules in natural gas can combine with water to form ice-like crystals, called natural gas hydrates. In 1930, Hammerschmidt discovered the phenomenon of natural gas hydrates clogging natural gas transportation pipelines and gas wells, and the problem of natural gas hydrates gradually attracted close attention from the industry. The huge troubles brought by hydrates to oil and gas production have become an urgent problem to be solved. [0003] The main ways to inhibit the formation of natural gas hydrates are: (1) remove the moisture in the natural gas; (2) heat the pipeline, because hydrates are likely to form below a certain temperature; (3) control the pressure, becaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/035C09K8/524
Inventor 倪婷郝红王鹏飞陈琛
Owner NORTHWEST UNIV(CN)
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