Compound gas hydrate anti-agglomerant and application thereof

A technology of gas hydrate and anti-polymerization agent, which is applied in the direction of drilling composition, gas/liquid distribution and storage, mechanical equipment, etc., and can solve the problem of poor polymerization inhibition effect, low gas separation ability, and reduced gas transportation capacity of the system and other problems, to achieve the effect of reducing operating pressure and reducing operating costs

Active Publication Date: 2016-07-06
SOUTHWEST PETROLEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Currently published types of gas hydrate inhibitors mainly include amide compounds, quaternary ammonium compounds, anionic and neutral ionic surfactants, etc., but most inhibitors are used alone when the water content of the emulsion exceeds 20%. When the polymerization inhibition effect rapidly deteriorates, the agglomeration in the h...

Method used

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  • Compound gas hydrate anti-agglomerant and application thereof
  • Compound gas hydrate anti-agglomerant and application thereof
  • Compound gas hydrate anti-agglomerant and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a composite gas hydrate anti-polymerization agent, which is composed of a quaternary ammonium salt type cationic surfactant TBAB and a polyol type nonionic surfactant Span 20 in a mass ratio of 2:1 . The above-mentioned composite gas hydrate anti-polymerization agent is added to a water-oil mixed system with a water content of 20% (calculated on the basis of the sum of the volumes of water and oil), and then the composite gas hydrate provided in this example is added. The application effect of the anti-aggregation agent was evaluated. It is proposed to study the state change of methane hydrate formation process system in the water / diesel emulsion containing the compound gas hydrate anti-polymerization agent. The experimental setup used is figure 1 As shown, the device has been described in patent ZL201310014858.9. The specific steps of using this high-pressure transparent sapphire reactor device to carry out the application evaluation test ar...

Embodiment 2

[0045]This embodiment provides a composite gas hydrate anti-polymerization agent, which is composed of a quaternary ammonium salt type cationic surfactant TBAB and a polyol type nonionic surfactant Span 20 in a mass ratio of 3:1 . The above-mentioned composite gas hydrate anti-polymerization agent is added to a water-oil mixed system with a water content of 25% (calculated on the basis of the volume of water and oil), and then the composite gas hydrate provided in this example is added. The application effect of the anti-aggregation agent was evaluated. It is proposed to study sour gas-bearing natural gas (H 2 S / CO 2 / CH 4 / N 2 ) in the water / diesel emulsion containing the compound gas hydrate anti-polymerization agent to form a hydrate process system state change. The experimental setup used is also figure 1 The experimental setup containing the high pressure transparent sapphire autoclave is shown.

[0046] In the present embodiment, the oil-water system in the reacti...

Embodiment 3

[0050] This embodiment provides a composite gas hydrate anti-polymerization agent, which is composed of a quaternary ammonium salt type cationic surfactant TBAB and a polyol type nonionic surfactant Span 20 in a mass ratio of 3:1 . The change of particle chord length in the system during the formation of hydrate of acid gas-containing natural gas in the water / diesel emulsion containing the compound gas hydrate anti-aggregation agent is planned to be studied. The experimental setup used was figure 2 Shown is a blind autoclave device containing a visible microscope probe (PVM) and a focused beam reflection measuring probe (FBRM) laser particle sizer probe, which has been described in patent CN201410075004.6. The specific steps to carry out the test are as follows:

[0051] Before the start of the experiment, the autoclave and all the connecting parts were rinsed with distilled water, and then dried with nitrogen. Clean the PVM measuring probe 201 and the FBRM measuring probe...

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Abstract

The invention discloses a compound gas hydrate anti-agglomerant and an application thereof. The anti-agglomerant is prepared by compounding a polyalcohol nonionic surfactant and a quaternary ammonium salt compound, wherein the polyalcohol nonionic surfactant is one or a combination of more of span-20, span-40, span-60, span-65, span-80 and span-85; and the quaternary ammonium salt compound is one or a combination of more of tetrabutylammonium bromide, tetraamylammonium bromide, dodecyltrimethylammonium bromide, dodecyltrimethylammonium chloride, tetradecyltrimethylammonium chloride, cetyltrimethylammonium chloride, dioctyldimethyl ammonium chloride and didecyldimethyl ammonium chloride. The anti-agglomerant is applied to a separation process of a mixed gas by a water/oil emulsion system in the conditions of mixed transportation of an oil-gas-water three-phase system and hydrate generation. Under the influence of supercooling degree and operation conditions, the compound gas hydrate anti-agglomerant disclosed by the invention has the advantages of small dosage, good performance, economy and environmental friendliness, wide application range, good recycling property and the like and has a broad market prospect.

Description

technical field [0001] The invention relates to a composite gas hydrate anti-aggregation agent and application thereof, belonging to the technical field of oil and gas production. Background technique [0002] Gas hydrates are ice-like clathrate crystalline substances generated by water molecules and small molecular gases under suitable conditions, in which water molecules form a network lattice around gas molecules through hydrogen bonding, and gas molecules play a role in the lattice. to stabilize the lattice. The small molecule gas mainly includes H 2 , CH 4 , N 2 , CO 2 , C 2 H 4 , C 2 H 6 , C 3 H 6 Wait. In recent years, there have been more and more research reports related to gas hydrates, mainly due to the following reasons: First, under the situation of the intensified global energy crisis, gas hydrate reservoirs with huge resources have been discovered in the seabed and tundra (Methane hydrate), it is preliminarily estimated that its organic carbon rese...

Claims

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Application Information

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IPC IPC(8): C09K8/524F17D1/00B01D53/02
CPCB01D53/02B01D2253/20C09K8/524C09K2208/22F17D1/005
Inventor 刘煌郭平汪周华杜建芬邱奕龙魏纳李清平
Owner SOUTHWEST PETROLEUM UNIV
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