Downhole throttling control hydrate mechanism and process.

Gas hydrate is formed in a certain pressure, temperature balance system, according to the conclusion of the experiment, methods of prevention of hydrate formation is to reduce the gas pressure in the wellbore or improving mining gas temperature. Downhole throttling technology principle is that the ground air nozzle is moved to the underground production of upper layer oil pipe, throttle, buck, the expansion process that the natural gas occurrence in wellbore. The absorption of formation heat by natural gas underground gas throttling, after cooling can reduce the gas nozzle, the upper pressure of natural gas, increase the recovery of natural gas hydrate formation conditions of wellhead temperature, damage, prevention of hydrate formation to achieve.
Fixed type downhole throttling process principle
With the production pipe column will choke working barrel down to hydrate prediction control of depth, then the throttle (with corresponding specifications gas nozzle) by testing the car into the working barrel, and can realize the downhole throttling production, and according to the gas well production situation change of underground gas nozzle specifications, so as to prevent hydrate objective.
Movable downhole throttling process principle
When the gas well downhole throttling gas needs, without well killing and tubing. Using the test car will activities down to the design position of the gas nozzle back seat sealing, can realize the downhole throttling. Salvage replacement of underground gas nozzle before the first impact deblocking, special tool for fishing again under the gas nozzle remove, the utility model has the advantages of no need operation, flexible adjustment, convenient replacement.