Method and device for evaluating inhibiting ability of drilling fluid on formation and decomposition of hydrate

Abstract

The invention relates to a method and a device for evaluating inhibiting ability of drilling fluid on formation and decomposition of hydrate. The device comprises a high and low temperature experimental box (1), a high-pressure reaction kettle (2) in the high and low temperature experimental box, a pressure controlling system, a microvideo camera and a data acquisition and control system (12). The reaction kettle is connected with the pressure controlling system through high-pressure pipelines on the upper and lower parts of the kettle; data acquisition and control system is connected with sensors arrange at the bottom of the reaction kettle and a high-pressure control platform (13) through data acquisition signal wires, wherein drilling fluid (4) to be tested is put on the high-pressure control platform; the microvideo camera is arranged in an observation cylinder (21) extended into a working chamber outside the high and low temperature experimental box and approaches front end of the observation cylinder (21) having anti-fog transparent glass so as to observe. The invention provides the device to evaluate inhibiting experiments of drilling fluid in underground bored wells and frozen earth and marine bored wells on formation and decomposition of hydrate under different temperature and pressure.

Description

technical field [0001] The invention relates to the field of natural gas development, in particular to a method and a device for evaluating the ability of drilling fluid to inhibit the formation and decomposition of hydrate. Background technique [0002] Natural gas hydrate is an ice-snow-like crystalline compound with a cage-like structure composed of water molecules and hydrocarbon gas molecules. It has the characteristics of high energy density, wide distribution and large reserves. It is a potential new energy and alternative energy. . Since the first discovery of gas hydrate by Davy in the laboratory in 1810, human beings have never stopped researching and exploring gas hydrate. The discovery of large-scale natural gas hydrates in nature in 1960 directly prompted many countries to turn their attention to this potential new energy source with high energy density, huge reserves, clean and environmental protection. After entering the 21st century, with the intensificatio...

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Problems solved by technology

However, there is currently no experimental system for evaluating the inhibition

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