Efficient and non-corrosive hydrate inhibitor

A hydrate inhibitor and non-corrosion technology, which is applied in the direction of drilling composition, chemical instruments and methods, etc., can solve the problems of small application range, achieve wide applicability, simple treatment process, and overcome corrosion

Active Publication Date: 2009-12-23
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the kinetic inhibitor is limited by the degree of supercooling, and its application range is small; the anti-polymerization agent is to prevent the coalescence of hydrate crystal grains by adding some low-concentration surfactants or polymers, and ensure the safe transportation of fluids

Method used

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  • Efficient and non-corrosive hydrate inhibitor

Examples

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Comparison scheme
Effect test

Embodiment 1

[0036] Experimental method and steps such as comparative example, add 150mL crude oil sample in reactor, in crude oil sample, add inhibitor of the present invention, the mass ratio of inhibitor and water in crude oil sample is 12.5%, wherein the mass ratio of span20 and water is 0.5%, the mass ratio of calcium nitrate to water is 12%. The initial temperature of the reaction was set at 3°C, and gas (CH 4 91.05%, C 2 h 6 6.05%, C 3 h 8 2.90%), make the pressure reach 6MPa, open the magnetic stirrer and start the reaction. At the end of the reaction, it was measured that the hydrate formation time was 170 min, and the hydrate complete formation time was 370 min. The test results show that the combined use of 0.5% Span20 (sorbitan monolaurate) and 12% calcium nitrate significantly prolongs the formation time and complete formation time of hydrate, and the anti-polymerization and inhibition properties of Span20 and calcium nitrate are significantly improved.

Embodiment 2

[0038] Add 150mL crude oil sample in reactor, in crude oil sample, add inhibitor of the present invention, with respect to the quality of water in crude oil sample, the mass ratio of inhibitor of the present invention and water is 9%, wherein Span20 (Sorbitan monolauric anhydride The mass ratio of acid ester) to water was 1%, and the mass ratio of calcium nitrate to water was 8%; the experimental procedure was as in Example 1, the hydrate formation time was 155min, and the hydrate complete formation time was 400min. The results show that the inhibitors in this system have obvious inhibitory and anti-polymerization effects.

Embodiment 3

[0040] Add 150mL crude oil sample in reactor, in crude oil sample, add inhibitor of the present invention, with respect to the quality of water in crude oil sample, the mass ratio of inhibitor of the present invention and water is 25.05%, wherein span20 (Sorbitan monolaurate The mass ratio of acid ester) to water was 0.05%, and the mass ratio of calcium nitrate to water was 25%; the experimental procedure was as in Example 1, the hydrate formation time was 190min, and the hydrate complete formation time was 315min. The results show that the inhibitors in this system have obvious inhibitory and anti-polymerization effects.

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Abstract

The invention provides a high-efficient non-corrosive hydrate inhibitor, relating to the technical field of oil-gas hydrate. The hydrate inhibitor is a mixture of an anti-agglomerant and a urea or a calcium nitrate and is used at the pressure of 1.5 to 25 MPa and at the temperature of minus 20 DEG C to 25 DEG C. The hydrate inhibitor overcomes the defects of the prior art, reduces the nucleary, the growth and the coalescence speed of hydrate after being filled in petroleum fluid in production or conveying by mixing at low concentration and has the characteristics of wide application, low cost and no corrosion to pipelines.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrate technology, in particular to an efficient and non-corrosive hydrate inhibitor. technical background [0002] In the pipelines of natural gas and petroleum fluids, various low-boiling hydrocarbons such as methane, ethane, propane, carbon dioxide, hydrogen sulfide, etc., react with water under certain temperature and pressure conditions to form a kind of ice-like crystal with a cage structure. It is a non-stoichiometric solid compound. In the oil and gas industry, the formation of gas hydrates will lead to the blockage of oil and gas transportation pipelines, and even the bursting of pipelines, which will bring many technical obstacles and huge economic losses to the exploitation and transportation of oil and natural gas. In addition, for offshore oil and gas field development and deep-sea pipeline transportation, the problem of hydrate is particularly prominent, because the water tempe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/52
Inventor 樊栓狮王燕鸿郎雪梅杜娟毕丹丹
Owner SOUTH CHINA UNIV OF TECH
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