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A kind of composite gas hydrate antipolymerization agent and its application

A technology of gas hydrate and antipolymerization agent, which is applied in the direction of drilling composition, gas/liquid distribution and storage, separation method, etc., and can solve problems such as low gas separation ability, poor polymerization inhibition effect, and limited working environment , to achieve the effect of reducing operating costs and reducing operating pressure

Active Publication Date: 2018-10-12
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 hydrate / diesel slurry increases, which greatly limits the working environment of the oil-gas-water three-phase system for gas storage and transportation, and at the same time reduces the gas transportation capacity of the system; while for the water / oil emulsion The system separates mixed gas, low water content means low gas separation ability

Method used

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  • A kind of composite gas hydrate antipolymerization agent and its application
  • A kind of composite gas hydrate antipolymerization agent and its application
  • A kind of composite gas hydrate antipolymerization agent and its application

Examples

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Effect test

Embodiment 1

[0039] This embodiment provides a composite gas hydrate antipolymerization agent, which is composed of quaternary ammonium salt cationic surfactant TBAB and polyol type nonionic surfactant Span 20 in a mass ratio of 2:1 . Add the above composite gas hydrate antipolymerization agent to the water-oil mixed system with a water content of 20% (calculated based on the sum of the volumes of water and oil), and then to the composite gas hydrate provided in this example The application effect of anti-aggregation agent was evaluated. It is proposed to study the state change of the system during the hydrate formation process of methane in the water / diesel oil emulsion containing the compound gas hydrate antipolymerization agent. The experimental device used is as figure 1 As shown, the device has been described in the patent ZL 201310014858.9. The specific steps for the application evaluation test using this high-pressure transparent sapphire reactor device are as follows:

[0040] ...

Embodiment 2

[0045]This embodiment provides a composite gas hydrate antipolymerization agent, which is composed of quaternary ammonium salt cationic surfactant TBAB and polyol type nonionic surfactant Span 20 in a mass ratio of 3:1 . Add the above composite gas hydrate antipolymerization agent to the water-oil mixed system with a water content of 25% (calculated based on the sum of the volumes of water and oil), and then to the composite gas hydrate provided in this example The application effect of anti-aggregation agent was evaluated. It is proposed to study natural gas containing sour gas (H 2 S / CO 2 / CH 4 / N 2 ) Changes in the state of the system during the formation of hydrates in the water / diesel oil emulsion containing the composite gas hydrate antipolymerization agent. The experimental device used is also figure 1 Shown is the experimental setup containing a high-pressure transparent sapphire kettle.

[0046] In this embodiment, the oil-water system in the reactor is compose...

Embodiment 3

[0050] This embodiment provides a composite gas hydrate antipolymerization agent, which is composed of quaternary ammonium salt cationic surfactant TBAB and polyol type nonionic surfactant Span 20 in a mass ratio of 3:1 . It is proposed to study the change of particle chord length in the process of hydrate formation of sour gas-containing natural gas in water / diesel oil emulsion containing the compound gas hydrate antipolymerization agent. The experimental device used is figure 2 The shown autoclave device contains a visible microscopic probe (PVM) and a focused beam reflection measurement probe (FBRM) laser particle size analyzer probe, which has been described in the patent CN201410075004.6. The specific steps to carry out the test are as follows:

[0051] Before the experiment started, the autoclave and all connected parts were flushed with distilled water, and then dried with nitrogen. Clean the PVM measuring probe 201 and FBRM measuring probe 202 to meet the measureme...

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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 antipolymerization agent and application thereof, belonging to the technical field of oil and gas production. Background technique [0002] Gas hydrate is an ice-like clathrate crystal substance formed by water molecules and small molecule gases under suitable conditions, in which water molecules form a network lattice around gas molecules through hydrogen bonds, and gas molecules play a role in the lattice. to stabilize the lattice. The small molecular 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 hydrate, mainly due to the following reasons: First, under the situation of intensified global energy crisis, huge resources of gas hydrate deposits have been discovered in the seabed and tundra (Methane hydrate), the preliminary estimate of its organic carbon reserves is more than twice tha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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