Device and method for kinetic study of drilling fluid and natural gas hydrate

Abstract

The invention discloses a device and a method for kinetic study of drilling fluid and natural gas hydrate. The device comprises a gas source, a booster pump, a buffer tank, a reaction kettle and a vacuum pump which are connected in sequence, wherein a pressure adjusting valve is arranged between the gas source and the booster pump; a valve is arranged between the booster pump and the buffer tank; the buffer tank is connected with the reaction kettle through two branches; the pressure adjusting valve and the valve are arranged on the branches respectively; the two branches are joined and connected with the reaction kettle through the valve; two branches are arranged at the output end of the reaction kettle, one branch is connected with the vacuum pump through the valve, and a valve and a back pressure valve are arranged on the other branch respectively; a temperature sensor and a pressure sensor are arranged on the buffer tank and the reaction kettle respectively; a camera storage tube, a conductivity meter, a magnetic stirring paddle and a transparent observation window are also arranged on the reaction kettle; and a stainless steel lining is arranged at the inner side of the reaction kettle. According to the device and the method, the process of conversion of the drilling fluid in the kettle from liquid to hydrate can be conveniently shot and observed, and the change of the liquid resistance in the reaction kettle along with the reaction time can be represented.

Description

technical field [0001] The invention relates to a device system for studying the kinetics of natural gas hydrate, in particular to a device and method for studying the formation and decomposition of drilling liquid natural gas hydrate. Background technique [0002] Various low-boiling hydrocarbons such as methane, ethane, propane and carbon dioxide, hydrogen sulfide, etc. are present in natural gas and other petroleum fluids, and water is also mixed with these petroleum fluid components in varying amounts. At low temperature and high pressure, when such petroleum fluid components or other hydrate formers are mixed with water, gas hydrates can be formed, which are clathrate crystals formed by water and small molecular gases such as light hydrocarbons. During the exploitation and transportation of natural gas and other petroleum fluids, these clathrate hydrates may block pipelines and bring difficulties to the exploitation or transportation of oil and natural gas. For example...

AI Technical Summary

Problems solved by technology

In the annulus, pressure rises due to the accumulation of disintegrated gases may allow these gases to combine with moisture in the drilling fluid to regenerate hydrates in the wellbore, drill string, wellhead nozzle or blowout manifold , causing blockage of the pipeline, seriously affecting the normal drilling and well control work

In addition, due to the loss of water in the drilling fluid, its rheological properties deteriorate and the ability to suspend cuttings is reduced, which in turn leads to accidents such as diameter shrinkage and drill sticking.

[0006] At present, there are few devices specially used for the research of drilling fluid gas hydrate, and basically all high-pressure gas hydrate research devices are not targeted, and the measurement methods and methods cannot meet the needs of drilling fluid research

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