Polysaccharide hydrate dynamics inhibitor and application thereof

A kinetic inhibitor, hydrate technology, applied in drilling compositions, chemical instruments and methods, etc., can solve problems such as poor thermal and salt stability, and achieve the effects of stable performance, low production cost and good versatility

Inactive Publication Date: 2017-12-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of existing inhibitors' biodegradability and poor stability to heat and salt, the present invention proposes a green and stable hydrate kinetic inhibitor

Method used

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  • Polysaccharide hydrate dynamics inhibitor and application thereof
  • Polysaccharide hydrate dynamics inhibitor and application thereof
  • Polysaccharide hydrate dynamics inhibitor and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Before the reaction started, the reactor was cleaned with deionized water, and 250 g of deionized water was added. After the temperature in the reactor was stabilized at 25° C., 12.3 MPa of methane gas was introduced (the volume ratio of methane gas to deionized water was 1:4 ), turn on mechanical stirring (650rpm). After the equilibrium pressure of the dissolved gas in the kettle is stabilized (stabilized at 11.6MPa), the temperature is lowered at a rate of 2°C / h. After the hydrate is formed, the temperature is raised at a rate of 1 °C / h, and the rate of temperature increase is reduced to 0.1 °C / h at the end of the heating section, and the system CH 4 - Water-hydrate three-phase equilibrium at 14 °C.

Embodiment 2

[0032] Add 250 g of deionized water into the reaction kettle, and the mass fraction of the polysaccharide hydrate inhibitor of the present invention in the solution is 0.5 wt % guar gum. After the temperature in the reactor is stabilized at about 25°C, a 11.5MPa acidic gas mixture (CO 2 40.39%, CH 459.61%) (the volume ratio of acidic gas mixture to deionized water is 1:4), and the mechanical stirring (650rpm) was started. After the equilibrium pressure of the gas dissolved in the kettle is stabilized (stabilized at 10.4MPa), the temperature is lowered to 0.2°C at a rate of 2°C / h. The experimental results show that the durable subcooling degree of 0.5wt% guar gum against the acid mixture is 4.8°C. After the hydrate was formed, 0.32wt% of water in the system was kept to be converted into hydrate, and the temperature was lowered again to carry out the evaluation experiment of crystal growth inhibition method. The results showed that 0.5wt% guar gum completely inhibited the sup...

Embodiment 3

[0036] Add 250g deionized water in the reaction kettle, the solute in this solution is 0.5wt% guar gum and 3.5wt% NaCl. After the temperature in the reactor is stabilized at about 25°C, a 11.5MPa acidic gas mixture (CO 2 40.39%, CH 4 59.61%) (the volume ratio of acidic gas mixture to deionized water is 1:4), and the mechanical stirring (650rpm) was started. After the equilibrium pressure of the gas dissolved in the kettle is stabilized (stabilized at 10.4MPa), the temperature is lowered to 0.2°C at a rate of 2°C / h. The experimental results show that 0.5wt% guar gum can increase the durable subcooling degree of the acid mixture to 5.8°C. After the hydrate was formed, 0.32wt% of water in the system was kept to be converted into hydrate, and the temperature was lowered again to carry out the evaluation experiment of crystal growth inhibition method. The results show that the range of supercooling in the zone of complete inhibition of 0.5wt% guar gum is 0℃~3.27℃, the range of ...

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Abstract

The invention discloses a polysaccharide hydrate dynamics inhibitor and application thereof. The polysaccharide hydrate dynamics inhibitor is characterized in that the hydrogen of a mannose molecule on a galactomannan main chain is substituted by hydroxypropyl trimethylammonium chloride; the mass by using hydrate to generate raw water is used as the basis, and the concentration of the inhibitor is 0.2wt% to 3.5wt%. The polysaccharide hydrate dynamics inhibitor has the characteristics that the green and environment-friendly effects are realized, the usage amount is small, and the acid-resistant, salt-resistant, and heat-resistant properties are strong; the requirement of inhibiting the hydrate under multiple extreme conditions can be met, the preventing and control cost of the hydrate is greatly reduced, and the adverse effect to environment is decreased.

Description

technical field [0001] The invention relates to the technical field of oil and gas hydrates, in particular to a polysaccharide hydrate inhibitor. 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 temperature and pressure conditions on t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/00C09K8/524
CPCC08B37/0087C08B37/0093C08B37/0096C09K8/524C09K2208/22
Inventor 樊栓狮方松添郎雪梅王燕鸿
Owner SOUTH CHINA UNIV OF TECH
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