A device for monitoring and preventing hydrates in throttling wells

Abstract

The invention discloses a device for monitoring and preventing hydrates in a choke well, which includes a choke, a pneumatic generator, a heater, and a pressure change and temperature change monitoring device; With high pressure difference, the airflow speed can reach the speed of sound, and the pressure difference between the front and back of the restrictor is used to generate electricity for the pneumatic generator, and the electric energy provided can continuously provide electric energy for other equipment at the bottom of the well. The electric energy is mainly used for heating the heater and supplying energy for the pressure change and temperature change monitoring devices; the heating temperature of the natural gas in the throttling process rises above the temperature of the hydrate formation point, which can effectively reduce the damage caused by the formation of hydrate at the bottom of the well. It also provides a solution for oil field energy saving and efficiency enhancement. In addition, the instrument transmits the temperature and pressure at the bottom of the well to the surface through the ultrasonic wave in the wellbore solid, and the ground receiver decodes and calculates through the computer to confirm whether there is a risk of hydrate formation in the wellbore.

Description

technical field [0001] The invention relates to the technical field of natural gas well production, in particular to a device for throttling downhole hydrate monitoring and prevention. Background technique [0002] In the production of natural gas wells, since the high pressure or abnormally high pressure of the gas reservoir poses risks to the wellhead equipment, downhole throttling is often used to reduce the wellhead pressure. The downhole choke technology is to place a choke of a certain size in the tubing at a certain depth in the well to realize choke and pressure reduction in the wellbore, convert the pressure energy into kinetic energy, increase the fluid flow speed, and make the choke fluid always maintain a critical flow. state, reducing the impact of wellhead pressure fluctuations on the bottom hole. Existing throttles include oil nozzles, central pipes, hosting, springs, lower thrusters, upper thrusters, sealant cylinders, slips and other components. During thr...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing choke is easy to produce low-temperature area in the choked wellbore due to the Joule-Thomson effect in the choke process, and the natural gas-water mixture is easy to produce hydrate, which causes the problem of blockage of the whole well and production safety. , providing a device for hydrate monitoring and prevention in throttling wells

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