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A kind of composite natural gas hydrate inhibitor and its preparation method and application

A hydrate inhibitor and natural gas technology, applied in the field of oil and gas fields, can solve the problems of limited inhibitory effect, etc., and achieve the effects of obvious inhibitory effect, less usage and less environmental damage

Active Publication Date: 2021-01-26
RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Studies have found that the inhibitory effect of existing single-type low-dose kinetic inhibitors is limited and cannot meet the actual needs. Therefore, it is very important to enhance the inhibitory performance of kinetic inhibitors

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Evaluation method of inhibition effect:

[0018] First, rinse the reactor with distilled water and drain the cleaning solution. Then, a certain amount of experimental water was pumped into the oil and gas field produced water (salinity is 52163mg / L), and the air in the reactor was sucked out with a vacuum pump. %, ethane 0.59%, propane 0.11%, N 2 1.90%, CO 2 2.57% of the experimental gas, adjust the pressure in the kettle to the experimental pressure, stir the reaction at 1000r / min, stop the experiment after a sudden change in the pressure in the reactor, judge the hydrate formation process according to the pressure change in the reactor and combined with the temperature, and evaluate Inhibitor effect.

[0019] In the present invention, the vinylpyrrolidone / vinylcaprolactam / dimethylaminoethyl methacrylate copolymer adopts the model COPOLYMER VC-713 terpolymer of American Ashland Company.

[0020] Example 1

[0021] 1. A composite natural gas hydrate inhibitor, cons...

Embodiment 2

[0027] 1. A composite natural gas hydrate inhibitor, consisting of a kinetic inhibitor, polyethylene glycol, and cyanamide sulfate in a mass ratio of 4:1:1,

[0028] Wherein, the kinetic inhibitor is a mixture of equal mass trimers, polyvinylpyrrolidone and polyvinylcaprolactam;

[0029] The terpolymer is a vinylpyrrolidone / vinylcaprolactam / dimethylaminoethyl methacrylate copolymer, which is COPOLYMER VC-713 terpolymer produced by American Ashland Company;

[0030] It can be prepared by mixing and stirring the above-mentioned components according to the proportion.

[0031] 2. Prepare the above-mentioned inhibitors into an aqueous solution of gas field production with a mass concentration of 0.2%, put it into a reactor, and start the test at an experimental pressure of 7.0MPa and an experimental temperature of 4°C to measure the inhibition of natural gas hydrate formation. The time is 14500min.

Embodiment 3

[0033] 1. A composite natural gas hydrate inhibitor, consisting of a kinetic inhibitor, butyl glycol ether, and cyanamide sulfate in a mass ratio of 2:1:1,

[0034] Wherein, the kinetic inhibitor is a mixture of equal mass trimers and polyvinylpyrrolidone;

[0035] The terpolymer is a vinylpyrrolidone / vinylcaprolactam / dimethylaminoethyl methacrylate copolymer, which is COPOLYMER VC-713 terpolymer produced by American Ashland Company;

[0036] It can be prepared by mixing and stirring the above-mentioned components according to the proportion.

[0037] 2. Prepare the above-mentioned inhibitors into an aqueous solution of gas field production with a mass concentration of 1%, put it into a reactor, and start the test at a test pressure of 7.0 MPa and a test temperature of 4°C to measure the inhibition of natural gas hydrate formation. The time is 13400min.

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PUM

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Abstract

The invention provides a composite gas hydrate inhibitor. The composite gas hydrate inhibitor is composed of a kinetic inhibitor, a synergist and cyanamide sulfate according to a mass ratio of (1-4):1: 1. The kinetic inhibitor comprises at least two of a terpolymer, polyvinyl pyrrolidone and polyvinyl caprolactam. The terpolymer is a vinyl pyrrolidone / vinyl caprolactam / dimethyl aminoethyl methacrylate copolymer. The invention also provides a preparation method and use of the composite gas hydrate inhibitor. The composite gas hydrate inhibitor has obvious inhibitory effects, a small dosage, aconcentration of 0.2-2% and small pollution to the environment.

Description

technical field [0001] The invention belongs to the technical field of oil and gas fields, and in particular relates to a composite natural gas hydrate inhibitor and its preparation method and application. Background technique [0002] Methane, ethane, carbon dioxide and other components in natural gas react with water at low temperature and high pressure to form ice crystal solid hydrates. After coalescence, the flow area of ​​the pipeline will be reduced, throttling will occur, and the hydrate formation will be further accelerated. Generated, thereby blocking the pipelines and equipment in the process of gas field exploitation, natural gas processing and transportation, seriously affecting the safe operation of natural gas exploitation, transportation and processing. Therefore, it is very important to add inhibitors to avoid and prevent gas hydrates from clogging well bores, processing devices and gas pipelines during the production, treatment and transportation of natural...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/52F17D1/17
CPCC09K8/52C09K2208/22F17D1/17
Inventor 胡耀强张娟利刘婷婷鲍文李鹤杨朝锋梁裕如易冬蕊张春威王涛
Owner RES INST OF SHAANXI YANCHANG PETROLEUM GRP
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