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Novel hydrate kinetic inhibitor as well as preparation method and applications thereof

A kinetic inhibitor and hydrate technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problems of large loss of inhibitors, environmental damage, and large demand, so as to reduce the amount of production and prolong Time to build, good water solubility

Active Publication Date: 2014-12-10
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional additives are mainly thermodynamic inhibitors, including methanol, ethylene glycol and other alcohols or electrolytes to change the equilibrium conditions of hydrates, but the use of thermodynamic inhibitors requires a large demand and high cost, and at the same time, the loss of inhibitors is also large and leads to damage. The environment is destroyed, so seeking new low-dose and environmentally friendly hydrate inhibitors has become the research focus of current scientists

Method used

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  • Novel hydrate kinetic inhibitor as well as preparation method and applications thereof
  • Novel hydrate kinetic inhibitor as well as preparation method and applications thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Preparation of Poly 1-(4-Hydroxystyrene) Caprolactam Homopolymer

[0027] Mix 20 grams of p-chlorophenol monomer and 0.3 grams of N-vinylcaprolactam monomer in a glass tube, use palladium as a catalyst, heat up to 60 ° C, keep the temperature for 4 hours, cool to room temperature, and then filter and distill the product to obtain 1-(hydroxystyryl) caprolactam monomer is obtained. Mix the obtained monomer 1-(hydroxystyryl)caprolactam and diethyl ether at a volume ratio of 1:1, and add azobisisobutyronitrile dropwise at 100°C with a concentration of 1.0wt% to initiate solution polymerization, and the reaction time is 6 hours , to obtain poly 1-(4-hydroxystyrene) caprolactam homopolymer.

[0028] The inhibitor described in the following examples was tested using the product obtained in Example 1, and the weight average molecular weight of the inhibitor was 300,000.

[0029] The experimental platform used in the following examples is described as follows:

[0030] The pr...

Embodiment 2

[0035] Based on the quality of water, add 150mL deionized water into the reactor, wait until the temperature in the reactor is stabilized at 1°C, and then inject gas (CH 4 92.05%, C 2 h 6 5.05%, C 3 h 8 2.90%), so that its pressure is 3MPa, the reaction reaches equilibrium, and the amount of methane gas consumed is reflected by the pressure drop. The results show that the induction time required for hydrate formation is 43 minutes, and the complete hydrate formation time is 151 minutes. Prepare 150mL of aqueous solution of poly 1-(4-hydroxystyrene) caprolactam (PHAO) with a mass concentration of 0.1% and put it into a reaction kettle. The temperature in the kettle is stabilized at about 1° C. 4 92.05%, C 2 h 6 5.05%, C 3 h 8 2.90%), so that the pressure was stabilized at 3MPa, and the reaction reached equilibrium. The results showed that the induction time required for hydrate formation was 139min, and the complete hydrate formation time was 380min.

Embodiment 3

[0037] Based on the quality of water, add 150mL deionized water into the reactor, wait until the temperature in the reactor is stabilized at 1°C, and then inject gas (CH 4 92.05%, C 2 h 6 5.05%, C 3 h 82.90%), so that its pressure is 9MPa, the reaction reaches equilibrium, and the amount of methane gas consumed is reflected by the pressure drop. The results show that the induction time required for hydrate formation is 35 minutes, and the complete hydrate formation time is 140 minutes. Prepare 150mL of aqueous solution of poly 1-(4-hydroxystyrene) caprolactam (PHAO) with a mass concentration of 0.3% and put it into a reaction kettle. The temperature in the kettle is stabilized at about 1° C. 4 92.05%, C 2 h 6 5.05%, C 3 h 8 2.90%), so that the pressure was stabilized at 9MPa, and the reaction reached equilibrium. The results showed that the induction time required for hydrate formation was 55 minutes, and the complete formation time of hydrate was 210 minutes.

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Abstract

The invention discloses a novel hydrate kinetic inhibitor and a preparation method and applications thereof. The preparation method comprises the following steps: dissolving a monomer into a solvent, adding an initiator to trigger the polymerization of a solution, to obtain a novel hydrate kinetic inhibitor, wherein the main component of the inhibitor is polyhydroxyl polymer; the monomer is prepared by reacting chlorophenol with N-vinyl caprolactam or N-vinnyl pyrrolidone. The inhibitor has an effect that other inhibitors are combined with alcohols for use, can bear low supercooled temperature, the formation and induction time of a hydrate can be prolonged, the inhibitor of the hydrate inhibitor can be improved, and the novel hydrate kinetic inhibitor is high in efficiency, low in dose, wide in applicability and the like.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to a novel hydrate kinetics inhibitor and a preparation method and application thereof. Background technique [0002] During the pipeline transportation of oil and natural gas, due to the existence of low temperature and high pressure, the low boiling point hydrocarbon gases (CH4, C2H6, C3H8, etc.) form gas hydrates. The generated hydrates will block the pipes and valves in severe cases, resulting in pipe bursts and instrument damage. For offshore oil and gas field development and submarine pipeline transportation, the problem of hydrate formation is particularly prominent, because the seabed temperature is low and the pressure is high, which is very suitable for the formation of hydrates. For example, under a pressure of about 1 MPa, ethane can form hydrates at a temperature lower than 4°C, and at a pressure of 3 MPa, ethane can form hydrates at a temperature lower th...

Claims

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Application Information

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IPC IPC(8): C09K8/524C08F226/06
CPCC08F126/06C09K8/524C09K2208/22
Inventor 王燕鸿胡腾樊栓狮郎雪梅
Owner SOUTH CHINA UNIV OF TECH
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