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Composite hydrate inhibitor

A technology of hydrate inhibitors and kinetic inhibitors, which is applied in the direction of drilling compositions, pipeline systems, chemical instruments and methods, etc., can solve the problems of limited application occasions and limited dispersion performance of polymerization inhibitors, and achieve environmental protection Friendly, lower generation temperature, simple separation and recovery process

Inactive Publication Date: 2015-04-01
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the dispersion performance of the polymerization inhibitor is limited, and it can only work when there is an oil phase, so the application is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] PVCap with a weight-average molecular weight of 900-40000 and N,N,N,,N,,-tetramethyl-N"-methyl-N"-butylguanidine chloride ([MBTMG]Cl) in a mass ratio of 1 : 1 is configured into 200g of 0.05% mass concentration of the composite aqueous solution into the reactor, the experimental procedure is the same as above, the results show that the hydrate generation induction time under this system is 67min, the reaction completion time is 2219min, and the pressure drop in the reaction is 2.37MPa, which has Better suppression effect.

Embodiment 2

[0036] PVCap with a weight-average molecular weight of 900-40000 and N,N,N,,N,,-tetramethyl-N"-methyl-N"-butylguanidine chloride ([MBTMG]Cl) in a mass ratio of 1 : 1 is configured to add 200g of 0.25% composite aqueous solution into the reaction kettle, and the experimental procedure is the same as above. The results show that the hydrate formation induction time under this system is 319min, the reaction completion time is 4327min, and the pressure drop in the reaction is 1.55MPa, which has Better suppression effect.

Embodiment 3

[0038] PVCap with a weight average molecular weight of 900-40000 and N,N,N,,N,,-tetramethyl-N”-methyl-N”-butylguanidine chloride ([MBTMG]Cl) in a mass ratio of 1:1 Configure 200g of 0.5% composite aqueous solution into the reaction kettle, and the experimental procedure is the same as above. The results show that the induction time of hydrate formation in this system is 522min, the reaction completion time is 6950min, and the pressure drop in the reaction is 0.85MPa, which has a good performance. Inhibitory effect.

[0039] Comparing Example 3 with Comparative Examples 3 and 4, it can be seen that the combined use of kinetic inhibitor PVCap and ionic liquid can produce a better inhibitory effect than single-component inhibitors: the induction time of hydrate is prolonged, and the reaction The completion time is longer, and the pressure drop in the reaction is reduced; even, it is better than the sum of the effects of the single component inhibitors, which is due to the charge ...

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Abstract

The invention discloses a composite hydrate inhibitor. The composite hydrate inhibitor is formed by configuring a kinetic inhibitor and ionic liquid according to the mass ratio of 1:1, wherein the kinetic inhibitor is polyvinylcaprolactam with the weight-average molecular weight of 900-40000. The hydrate inhibitor disclosed by the invention has high inhibition activity, small using amount, low cost and environmental friendliness, is easy to recover and applicable to an oil-gas-water three-phase or oil-water or gas-water two-phase coexistence system, is applied to generation of inhibition hydrates in oil-gas production, processing and conveying processes and has broad prospects.

Description

Technical field: [0001] The invention relates to the technical field of chemical industry, in particular to a composite hydrate inhibitor. Background technique: [0002] During oil and gas extraction, processing and transportation, water and some light hydrocarbons in the system are very likely to form hydrates at low temperature and high pressure in the pipeline. If no suppression measures are taken, these hydrates will block pipelines, valves and equipment, affecting normal industrial production operation, causing huge economic losses and threatening the safety of the entire production system. Therefore, how to prevent and control hydrates has become one of the key issues in the oil and gas industry, especially for the exploitation of deep-sea oil and gas fields, the problem of hydrate blockage is more prominent. [0003] At present, the main hydrate control methods include water removal method, heating method, depressurization method and adding hydrate inhibitor method. ...

Claims

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Application Information

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IPC IPC(8): C09K8/524F17D1/17
CPCC09K8/524F17D1/17
Inventor 龙臻梁德青徐永霞李栋梁
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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