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Method for promoting growth of gas hydrate

A technology of gas hydrate and gas, which is applied in the field of promoting the growth of carbon dioxide gas hydrate and promoting the growth of gas hydrate. The effect of promoting nucleation and clustering

Inactive Publication Date: 2015-01-21
PETROCHINA CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing gas hydrate promoters have more or less disadvantages such as long induction time, harsh application conditions, high cost, complicated application process, high addition amount and poor corresponding promotion effect, and single application object.

Method used

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  • Method for promoting growth of gas hydrate
  • Method for promoting growth of gas hydrate
  • Method for promoting growth of gas hydrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This example provides a way to promote CO 2 The method for hydrate growth is completed by a gas hydrate synthesis device, the structure of which is as follows figure 1 As shown, the specific process includes the following steps:

[0037] Step 1: Use a vacuum pump to evacuate the entire device to remove excess gas. The evacuation time is 5 minutes, open the stop valve 2, and the CO in the gas storage bottle 1 2 Purge the gas circulation line for 2-3 times, close the stop valve 2, and then inject 200mL of gas hydrate promoter solution (fluorocarbon surfactant Intechem-01 (FC-01) with a mass concentration of 100ppm) into the high-pressure reaction In the kettle 4, a magnetic stirring device 7 is housed in the autoclave 4;

[0038] Step 2: Open the constant temperature water bath 5, set the initial temperature to 4°C, and after the temperature in the high-pressure reactor 4 in the water tank 6 is stabilized, a magnetic stirring device 7 is installed in the water tank, open ...

Embodiment 2

[0044] This example provides a way to promote CO 2 The method for hydrate growth is completed by using the gas hydrate synthesis device provided in Example 1. The specific process is similar to that of Example 1, except that the gas hydrate accelerator used is the fluorocarbon surfactant Intechem with a mass concentration of 500ppm. -01 (FC-01).

[0045] In the method for promoting the growth of gas hydrates provided in this example, the CO 2 Hydrates began to form, and the phase equilibrium pressure was 1.98MPa.

Embodiment 3

[0047] This example provides a way to promote CO 2 The method for hydrate growth is completed by using the gas hydrate synthesis device provided in Example 1. The specific process is similar to that of Example 1, except that the gas hydrate accelerator used is the fluorocarbon surfactant Intechem with a mass concentration of 1000ppm. -01 (FC-01).

[0048] In the method for promoting the growth of gas hydrates provided in this example, the CO 2 Hydrates start to form, and the phase equilibrium pressure is 1.87MPa.

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Abstract

The invention provides a method for promoting growth of a gas hydrate. According to the method, a gas is blown into a gas hydrate promoter solution; and at the temperature of 0-20 DEG C and at the pressure of 0-15 MPa, stirring is carried out at the rotating speed of 400-600r / min so as to obtain a gas hydrate, wherein the gas hydrate promoter solution is an aqueous solution of an amphoteric perfluoroalkyl ether betaine surfactant with the concentration being 100-1,000 ppm. By the method for promoting growth of the gas hydrate, nucleation and clustering of the gas hydrate can effectively be promoted, and induction time is shortened. In addition, surface tension of the gas hydrate is reduced remarkably, reaction time is shortened, production cost is low, and the promotion effect is more excellent.

Description

technical field [0001] The invention relates to a method for promoting the growth of gas hydrate, in particular to a method for promoting the growth of carbon dioxide gas hydrate, and belongs to the technical field of oil recovery. Background technique [0002] With the continuous increase of energy consumption, a large amount of industrial waste gas is directly discharged into the atmosphere, of which CO 2 is the chief culprit of the greenhouse effect, therefore, CO 2 Capture and storage technology is particularly important. Traditional CO 2 The recovery method generally has the disadvantages of large volume of equipment used and high investment costs. [0003] Gas hydrates are gases (N 2 , CO 2 、CH 4 、C 2 h 6 etc.) and water under low temperature and high pressure conditions to generate a clathrate crystal compound. In gas hydrates, water molecules are bound by strong hydrogen bonds to form a lattice structure, and gas molecules fill the cages between the lattices...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B31/20C01B32/50
Inventor 周诗岽张琳王树立李恩田
Owner PETROCHINA CO LTD
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