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Method for preparing composite hydrate accelerant

A hydrate accelerator and composite technology, which is applied in the petroleum industry, gas fuel, fuel, etc., can solve the problems of unsatisfactory and low gas storage density of hydrate, and achieve low cost, increased gas storage capacity and good conditions Reduced effect

Active Publication Date: 2012-12-26
溧阳常大技术转移中心有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, although this type of surfactant can accelerate the hydrate formation rate, it is still unsatisfactory, and the gas storage density of hydrate is not high.

Method used

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  • Method for preparing composite hydrate accelerant
  • Method for preparing composite hydrate accelerant
  • Method for preparing composite hydrate accelerant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034]The selected composite accelerator consists of: kinetic accelerator is cyclopentane CP, accounting for 1.3 to 15.0% by mass of the total solvent, surfactant is 2-butyloctyl sodium sulfate (GC12S), concentration is 0.32×10 -3 ~9.5×10 -3 mol / L (see Table 2). The experimental steps are the same as above. The temperature is 2.1-6.5°C, and the pressure is 0.65-2.4Mpa.

[0035] Table 1 Example 1 System Accelerator Preparation Concentration

[0036]

[0037] Under the above conditions, it is found through experiments that the induction time of hydrate formation is 4-19 minutes; the gas storage density is 163m 3 / m 3 above.

Embodiment 2

[0039] The selected composite accelerator consists of: the kinetic accelerator is methylcyclohexane, accounting for 1.3 to 15.0% of the water contained in the mass percentage, and the surfactant is 2-butyloctyl sodium sulfate (GC12S) , with a concentration of 0.32×10 -3 ~9.5×10 -3 mol / L (see Table 2). Sodium chloride (Nacl) with a mass percent content of 0.02-0.78% is added, and the experimental procedure is the same as above. The results show that the temperature is 2.3-5.3°C and the pressure is 0.62-3.2Mpa.

[0040] Table 2 Example two system accelerator preparation concentration

[0041]

[0042] Under the above conditions, it is found through experiments that the induction time of hydrate formation is 2-15 minutes; the gas storage density is 167m 3 / m 3 above.

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Abstract

The invention relates to a method for preparing a composite hydrate accelerant. The composite accelerant is characterized by being prepared by mixing cyclopentane or methyl cyclohexane serving as a kinetic accelerant and 2-butyl octyl sodium sulfate serving as a surfactant, wherein the percentage by mass of the cyclopentane or methyl cyclohexane in a solvent is 1.3 to 15.0, and the concentration of the surfactant 2-butyl octyl sodium sulfate in the solvent is 0.32*10<-3> to 9.5*10<-3> mol / L; and 0.02 to 0.78 mass percent of sodium chloride is added into the mixture. In the method, a high-pressure gas cylinder is taken as a gas source, a pressure is properly adjusted through a pressure adjustment valve, consumed gas is metered by a mass flow meter, a temperature and the pressure in a reactor are monitored by pressure and temperature transducers, and the temperature of liquid in a water tank is controlled by means of a thermostatic water bath, so that the temperature in the reactor is adjusted; and data is acquired by a data acquisition system and a computer, and the forming condition of a hydrate in the reactor is monitored by a photoelectric lens. The method for preparing the composite hydrate accelerant not only can reduce the forming condition of the hydrate, but also can shorten the formation time of the hydrate and improve the gas storage capacity of the hydrate.

Description

Technical field: [0001] The invention relates to the technical field of production and utilization of natural gas hydrate, in particular to a preparation method of a composite accelerator for accelerating the formation of natural gas hydrate. Background technique: [0002] At present, the development of new technologies based on hydrates is not only developing rapidly in the fields of energy and environmental protection, but also has made significant progress in some other fields, such as solid-state transportation and storage of natural gas, natural gas hydrates as vehicle fuels, natural gas hydrate-based New separation technologies (seawater desalination technology, concentration of organic aqueous solution, separation of gas mixtures and near-critical and supercritical extraction, etc.), as well as bioengineering and new materials based on natural gas hydrate, etc. However, the application of hydrates in these fields is closely related to the inhibition and promotion of n...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10L3/10
Inventor 王树立武雪红宋琦于汇军
Owner 溧阳常大技术转移中心有限公司
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