阅读说明：本技术 一种水合物抑制剂 (Hydrate inhibitor ) 是由 徐晓冬 聂华 李兵 郭新华 殷波 于 2021-05-20 设计创作，主要内容包括：一种水合物抑制剂：它由下述重量份的原料组成：乙二醇：30～135,丙三醇：6～33,聚乙二醇：3～9,聚丙三醇：6～9,聚乙烯基己内酰胺：5～39,聚乙烯吡咯烷酮：8～18,氯化钠：5～48,氯化钙：5～30,其能够高效控制天然气水合物的生成,降低了生产成本,提高了安全性、环保性。(A hydrate inhibitor which: the composition comprises the following raw materials in parts by weight: ethylene glycol: 30-135, glycerin: 6-33, polyethylene glycol: 3-9, polyglycerol: 6-9, polyvinyl caprolactam: 5-39, polyvinylpyrrolidone: 8-18, sodium chloride: 5-48, calcium chloride: 5-30, the generation of natural gas hydrate can be efficiently controlled, the production cost is reduced, and the safety and the environmental friendliness are improved.)

1. A hydrate inhibitor which: the composition comprises the following raw materials in parts by weight: ethylene glycol: 30-135, glycerin: 6-33, polyethylene glycol: 3-9, polyglycerol: 6-9, polyvinyl caprolactam: 5-39, polyvinylpyrrolidone: 8-18, sodium chloride: 5-48, calcium chloride: 5 to 30.

2. A hydrate inhibitor according to claim 1, wherein: the composition comprises the following raw materials in parts by weight: ethylene glycol: 36-42, glycerin: 6-18, polyethylene glycol: 3-9, polyglycerol: 6-9, polyvinyl caprolactam: 5-15, polyvinylpyrrolidone: 8-16, sodium chloride: 5-16, calcium chloride: 5 to 11.

3. A hydrate inhibitor according to claim 1, wherein: the composition comprises the following raw materials in parts by weight: ethylene glycol: 42, glycerin: 6, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 10, polyvinylpyrrolidone: 10, sodium chloride: 10, calcium chloride: 10.

4. a hydrate inhibitor according to claim 1, wherein: the composition comprises the following raw materials in parts by weight: ethylene glycol: 36, glycerin: 12, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 15, polyvinylpyrrolidone: 15, sodium chloride: 5, calcium chloride: 5.

5. a hydrate inhibitor according to claim 1, wherein: the composition comprises the following raw materials in parts by weight: ethylene glycol: 30, glycerin: 18, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 12, polyvinylpyrrolidone: 12, sodium chloride: 10, calcium chloride: 6.

6. a hydrate inhibitor according to claim 1, wherein: the composition comprises the following raw materials in parts by weight: ethylene glycol: 42, glycerin: 12, polyethylene glycol: 3, polyglycerol: 6, polyvinyl caprolactam: 10, polyvinylpyrrolidone: 16, sodium chloride: 6, calcium chloride: 5.

Technical Field

The invention belongs to the technical field of inhibitors, and particularly relates to a hydrate inhibitor.

Background

In the production process of the natural gas well in winter, workers can inject methanol into the well or a gas transmission pipeline to prevent hydrate production and freezing blockage in the natural gas production and transmission process; but the characteristics of easy volatilization, flammability and toxicity of methanol cause large transportation risk, field workers have poisoning risk during filling, and in addition, methanol-containing produced liquid needs processes such as dealcoholization water treatment and the like, so that the production cost is increased, and the safety and environmental protection are poor.

Disclosure of Invention

The invention aims to provide a hydrate inhibitor to solve the problems in the background art, which can efficiently control the generation of natural gas hydrate, reduce the production cost and improve the safety and environmental protection.

In order to achieve the purpose, the invention provides the following technical scheme:

a hydrate inhibitor which: the composition comprises the following raw materials in parts by weight: ethylene glycol: 30-135, glycerin: 6-33, polyethylene glycol: 3-9, polyglycerol: 6-9, polyvinyl caprolactam: 5-39, polyvinylpyrrolidone: 8-18, sodium chloride: 5-48, calcium chloride: 5 to 30.

Further, the feed additive is composed of the following raw materials in parts by weight: ethylene glycol: 36-42, glycerin: 6-18, polyethylene glycol: 3-9, polyglycerol: 6-9, polyvinyl caprolactam: 5-15, polyvinylpyrrolidone: 8-16, sodium chloride: 5-16, calcium chloride: 5 to 11.

Further, the feed additive is composed of the following raw materials in parts by weight: ethylene glycol: 42, glycerin: 6, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 10, polyvinylpyrrolidone: 10, sodium chloride: 10, calcium chloride: 10.

further, the feed additive is composed of the following raw materials in parts by weight: ethylene glycol: 36, glycerin: 12, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 15, polyvinylpyrrolidone: 15, sodium chloride: 5, calcium chloride: 5.

further, the feed additive is composed of the following raw materials in parts by weight: ethylene glycol: 30, glycerin: 18, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 12, polyvinylpyrrolidone: 12, sodium chloride: 10, calcium chloride: 6.

further, the feed additive is composed of the following raw materials in parts by weight: ethylene glycol: 42, glycerin: 12, polyethylene glycol: 3, polyglycerol: 6, polyvinyl caprolactam: 10, polyvinylpyrrolidone: 16, sodium chloride: 6, calcium chloride: 5.

furthermore, when the hydrate inhibitor is used, the using amount of the hydrate inhibitor is 0.5-3% of the volume of water in a system.

Compared with the prior art, the invention provides a hydrate inhibitor, which has the following beneficial effects:

the hydrate inhibitor is a non-toxic, degradable and low-dosage compound hydrate inhibitor, is safe, environment-friendly and economical, can efficiently control the generation of natural gas hydrate, and has the advantages of being embodied in the following aspects: (1) low dose: the dosage of the inhibitor is greatly lower than that of a thermodynamic inhibitor, and the dosage of the inhibitor is 0.5 to 3 percent of the volume of water in a system, so that the inhibitor is effective; (2) no need of harmless treatment: because nontoxic mixed alcohol and salt are used as raw materials, the hydrate inhibitor is nontoxic, and therefore, the hydrate inhibitor does not need to be treated in the processes of transportation, use and the like; (3) the existing gas collection process does not need to be modified: the process does not need to be modified, and the existing alcohol injection process can be fully utilized; (4) no environmental pollution, personal injury and safety accidents are caused; the hydrate inhibitor can completely replace methanol to prevent freezing and blocking of a natural gas well in winter.

Detailed Description

The invention is further described below with reference to examples, without limiting the scope of the invention to the following.

Example 1: a hydrate inhibitor which: the composition comprises the following raw materials in parts by weight: ethylene glycol: 42, glycerin: 6, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 10, polyvinylpyrrolidone: 10, sodium chloride: 10, calcium chloride: 10. when in use, the components are mixed, and the using amount is 0.5 percent of the volume of water in the system.

Example 2: an environment-friendly and efficient natural gas hydrate inhibitor: the composition comprises the following raw materials in parts by weight: ethylene glycol: 36, glycerin: 12, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 15, polyvinylpyrrolidone: 15, sodium chloride: 5, calcium chloride: 5. when in use, the components are mixed, and the using amount is 1.6 percent of the volume of water in the system.

Example 3: an environment-friendly and efficient natural gas hydrate inhibitor: the composition comprises the following raw materials in parts by weight: ethylene glycol: 30, glycerin: 18, polyethylene glycol: 6, polyglycerol: 6, polyvinyl caprolactam: 12, polyvinylpyrrolidone: 12, sodium chloride: 10, calcium chloride: 6. when in use, the components are mixed, and the using amount is 1.8 percent of the volume of water in the system.

Example 4: an environment-friendly and efficient natural gas hydrate inhibitor: the composition comprises the following raw materials in parts by weight: ethylene glycol: 36, glycerin: 6, polyethylene glycol: 9, polyglycerol: 9, polyvinyl caprolactam: 5, polyvinylpyrrolidone: 8, sodium chloride: 16, calcium chloride: 11. when in use, the components are mixed, and the using amount is 1.4 percent of the volume of water in the system.

Example 5: an environment-friendly and efficient natural gas hydrate inhibitor: the composition comprises the following raw materials in parts by weight: ethylene glycol: 42, glycerin: 12, polyethylene glycol: 3, polyglycerol: 6, polyvinyl caprolactam: 10, polyvinylpyrrolidone: 16, sodium chloride: 6, calcium chloride: 5. when in use, the components are mixed, and the using amount is 1 percent of the volume of water in the system.

Example 6: an environment-friendly and efficient natural gas hydrate inhibitor: the composition comprises the following raw materials in parts by weight: ethylene glycol: 135, glycerol: 33, polyethylene glycol: 3, polyglycerol: 6, polyvinyl caprolactam: 39, polyvinylpyrrolidone: 18, sodium chloride: 48, calcium chloride: 30. when the water-based paint is used, all the components are mixed, and the using amount of the water-based paint is 0.5-3% of the volume of water in a system.

The following experiments illustrate the beneficial effects of the present invention:

the practical test supercooling degrees in the following tests were all at-60 ℃.

Test 1: the solution of example 1 was used in an amount of 0.5% by volume based on the water in the system, and 57ml of THF (tetrahydrofuran) was added to 300ml of well water to evaluate the performance by the THF method. The test temperature was maintained at-5 ℃ at atmospheric pressure, and hydrates were formed after inhibition for 960 min.

And (3) testing 2: the solution of example 2 was used in an amount of 1.6% by volume based on the water in the system, and 57ml of THF was added to 300ml of well water to evaluate the performance by the THF method. Under normal pressure, the test temperature is maintained at-5 ℃, and hydrate is generated after inhibition for 985 min.

And (3) testing: the solution of example 3 was used in an amount of 1.8% by volume based on the water in the system, and 57ml of THF was added to 300ml of well water to evaluate the performance by the THF method. The test temperature was maintained at-5 ℃ at atmospheric pressure, and hydrate formation was inhibited after 1060 min.

And (4) testing: the solution of example 4 was used in an amount of 1.4% by volume based on the water in the system, and 57ml of THF was added to 300ml of well water to evaluate the performance by the THF method. Under normal pressure, the testing temperature is maintained at-5 ℃, and hydrate is generated after 890min of inhibition.

And (5) testing: the solution of example 5 was used in an amount of 1% by volume based on the water in the system, and 57ml of THF was added to 300ml of well water to evaluate the performance by the THF method. Under normal pressure, the testing temperature is maintained at-5 ℃, and hydrate is generated after 993min of inhibition.

And 6, testing: the solution of example 6 was used in an amount of 0.5% by volume based on the water in the system, and 57ml of THF was added to 300ml of well water to evaluate the performance by the THF method. Under normal pressure, the testing temperature is maintained at-5 ℃, and hydrate is generated after the inhibition is carried out for 980 min.

And 7, testing: the solution of example 6 was used in an amount of 3% by volume based on the water in the system, and 57ml of THF was added to 300ml of well water to evaluate the performance by the THF method. Under normal pressure, the testing temperature is maintained at-5 ℃, and hydrate is generated after 1660min of inhibition.

The hydrate inhibitor has the following advantages:

1. overcomes the defects of the traditional hydrate inhibition method: the composite material overcomes the defects of large dosage, high cost and strong corrosion to pipelines of thermodynamic inhibitors, and the thermodynamic inhibitors have the advantage of low supercooling degree, act synergistically on the kinetic inhibitors, overcome the influence of the supercooling degree on the kinetic inhibitors and play a good inhibiting role.

2. Combines the double inhibition effect of a thermodynamic inhibitor and a kinetic inhibitor on natural gas hydrate: the thermodynamic inhibitor inhibits the nucleation time and nucleation condition of the initial natural gas hydrate, and the kinetic inhibitor inhibits the nucleation and growth time of the later natural gas hydrate, so that the aggregation and blockage risks of the hydrate are reduced.

3. The main components of the hydrate inhibitor are ethylene glycol, glycerol and polymers thereof, which are non-volatile and non-corrosive, and inorganic salt, a small amount of polyvinyl caprolactam and polyvinylpyrrolidone are added, so that the hydrate inhibitor is a green and environment-friendly substance which is harmless to the environment and organisms and has no pollution to the environment, and can meet the requirement of environmental protection.

4. The inhibitor has no volatility, good chemical stability and thermal stability at the temperature of-60-100 ℃, non-combustion, no corrosion and convenient implementation.