Experimental facility for simulating flow condition variations of multiple diameter expanding sections in natural gas hydrate well drilling

Abstract

The invention discloses an experimental facility for simulating flow condition variations of multiple diameter expanding sections in natural gas hydrate well drilling. The facility comprises a mixture inlet, a sleeve joint A, a vertical section outer pipe, a flange joint A, an inclined well section outer pipe, a flange joint B, a horizontal section outer pipe and a sleeve joint B connected in sequence from the top down; the facility also comprises a computer monitoring system and a gas-liquid-solid separator, wherein the computer monitoring system is electrically connected with a pressure sensor and a speed sensor; and the facility also comprises an electromagnetic air pump A, an electromagnetic air pump B and a high speed camera, wherein a shunt pipe is connected with the output port of the electromagnetic air pump A. The experimental facility has the beneficial effects of being compact in structure, capable of being necessary to perform visualized experiment research on moving tracks and dynamic floating phenomena of rock fragment particles and natural gas hydrate particles in an annulus, and providing a basis for a flowing rule of a diameter expanding section flow field during a natural gas hydrate well drilling process.

Description

technical field [0001] The invention relates to the technical field of natural gas hydrate drilling, in particular to an experimental device for simulating flow state changes in various diameter expansion sections of natural gas hydrate drilling. Background technique [0002] At present, with the continuous deepening of exploration and development of oil and gas resources in my country, natural gas hydrate, as a new type of oil and gas resources, is currently valued by many countries. At present, gas hydrates are distributed in many countries in the world, mainly in the permafrost areas of the Arctic and in the seabed, continental slope, land base and trenches all over the world. my country's natural gas hydrate resources are about 80 billion tons of oil equivalent, twice the amount of conventional natural gas resources in my country, and are mainly distributed in the tundra of the Qinghai-Tibet Plateau, the continental slope of the South China Sea and its deep sea. my coun...

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Problems solved by technology

The poor purification effect of the wellbore in the horizontal section and the continuous decomposition of natural gas hydration during the upward return process will cause a series of engineering problems such as high friction, high torque, pipe sticking and poor cementing quality

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