Environment-friendly composite hydrate inhibitor and preparation method thereof

A hydrate inhibitor, a composite technology, which is applied to drilling compositions, chemical instruments and methods, mechanical equipment, etc., can solve the problems of poor biodegradability, low inhibitory activity, and high synthesis cost, and achieve low production costs. , Overcome the effects of high toxicity and low cost

Active Publication Date: 2015-09-23
SUZHOU BINGZHIHUO ENERGY SCI & TECH LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Kinetic inhibitors are mainly suitable for soda-water two-phase systems, and the kinetic inhibitors represented by poly N-ethylene caprolactam have low inhibitory activity and are prone to failure when the subcooling degree exceeds 10°C. Poor biodegradability is restricted by many offshore oil and gas fields; anti-aggregation can only work when there is an oil phase, and once the water content of the system exceeds 50wt%, the anti-aggregation will also fail. In addition, anti-aggregation also has high synthesis costs, Its use is limited due to many problems such as high toxicity

Method used

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  • Environment-friendly composite hydrate inhibitor and preparation method thereof
  • Environment-friendly composite hydrate inhibitor and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] Extraction of Pectin from Pomelo Peel

[0040] Step 1: Peel fresh Shatian pomelo from Meizhou City, Guangdong Province to obtain 130g of fresh pomelo peel. Mince 130g of fresh pomelo peel into small cubes of 0.5cm×0.5cm×0.5cm, and put the treated small pieces of pomelo peel into a 500ml one-necked flask. Boil in hot water at 90°C for 10 minutes to inactivate the pectinase in pomelo peel. Rinse the boiled pomelo peel 3 times until the solution is colorless to ensure that the pigment in the pomelo peel is removed.

[0041] Step 2: Prepare a solution with a pH of 2.0, and extract for 45-60 minutes under the conditions of a solid-to-liquid ratio (volume ratio) of pomelo peel and solution of 1:10 and a temperature of 95°C.

[0042] Step 3: Filter the solution obtained in step 2 with a Buchner funnel at 50° C. to obtain a filtrate.

[0043] Step 4: 95% alcohol is added to the filtrate obtained in step 3. With the gradual addition of alcohol (the volume ratio of alcohol to ...

Embodiment 2

[0052] Before the reaction started, the reactor was cleaned with deionized water, and 60 g of deionized water was added. After the temperature in the reactor was stabilized at 30° C., 10.5 MPa of simulated natural gas (CH 4 87.16%, C 2 h 6 3.60%, C 3 h 8 1.43%, i-C 4 h 10 0.29%, n-C 4 h 10 0.30%, i-C 5 h 12 0.10%, n-C 5 h 12 0.03%, C 6 h 14 0.95%, CO 2 5.73%, N 2 0.41%), turn on the magnetic stirring (700rpm). After the equilibrium pressure of the dissolved gas in the kettle is stabilized (stabilized at 10.2MPa), the temperature is lowered, the temperature of the box is set to 0.5°C, and the data acquisition system is turned on. After 2 hours, the temperatures of the six autoclaves were all stable at around 2.0°C. Through the temperature and pressure signals recorded by data collection, it was found that the temperature of the six kettles suddenly rose and the pressure dropped significantly at 1.1h, 0.9h, 1.2h, 0.98h, 1.14h, and 1.21h, which shows that the six ...

Embodiment 3

[0058] Before the reaction starts, the reactor is cleaned with deionized water, and 48g of deionized water and 12g of crude oil samples are added (the water content of the system is 80%). After the temperature in the reactor is stabilized at 30°C, 10.5MPa of simulated natural gas ( CH 4 87.16%, C 2 h 6 3.60%, C 3 h 8 1.43%, i-C 4 h 10 0.29%, n-C 4 h 10 0.30%, i-C 5 h 12 0.10%, n-C 5 h 12 0.03%, C 6 h 14 0.95%, CO 2 5.73%, N 2 0.41%), turn on the magnetic stirring (700rpm). After the equilibrium pressure of the dissolved gas in the kettle is stabilized (stabilized at 10.2MPa), the temperature is lowered, the temperature of the box is set to 0.5°C, and the data acquisition system is turned on. After 2 hours, the temperatures of the six autoclaves were all stable at around 2.0°C. Through the temperature and pressure signals recorded by data collection, it was found that the temperature suddenly rose and the pressure dropped significantly in the 6 kettles at 1.5h,...

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Abstract

The invention discloses an environment-friendly composite hydrate inhibitor and a preparation method thereof. The environment-friendly composite hydrate inhibitor consists of methyl esterified pectic acid and amino acid, wherein the mass ratio of methyl esterified pectic acid to amino acid is (1:2)-(1:20); the methyl esterification degree of pectic acid is 8-70%; the content of galactopyranose aldehyde acid is larger than 65 wt%. The methyl esterified pectic acid can effectively delay hydrate nucleation, reduce the hydrate formation rate and prevent hydrate accumulation, and the amino acid substance can remarkably reduce the hydration temperature or improve the hydration pressure through the thermodynamic action. The composite hydrate inhibitor not only overcomes the shortcomings that a single hydrate inhibitor is low in efficiency and poor in university, but also has the characteristics of favorable biodegradability, economical efficiency and environmental protection performance, and can meet the demands on chemicals from offshore and onshore oil and gas fields and pipeline additives, thereby being very wide in application range.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrate, in particular to a green composite hydrate inhibitor and a preparation method thereof. Background technique [0002] In the pipelines of natural gas and petroleum fluids, various low-boiling hydrocarbons such as methane, ethane, propane, carbon dioxide, and hydrogen sulfide react with water under certain temperature and pressure conditions to form a non-stoichiometric cage-type solid substance. Also known as clathrate hydrate crystals. 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 safety hazards 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 hydrates is also particularly prominent, because the tempera...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/524F17D1/16
CPCC09K8/524C09K2208/22F17D1/16
Inventor 樊栓狮王燕鸿郎雪梅许书瑞
Owner SUZHOU BINGZHIHUO ENERGY SCI & TECH LTD
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