METHOD FOR HYDRATE, GAS-HYDRATE AND HYDRATE-HYDROCARBON DEPOSIT LIQUIDATION Russian patent published in 2008 - IPC E21B37/00 

FIELD: oil and gas industry, particularly to remove hydrate, gas-hydrate and hydrate-hydrocarbon deposits generated during oil transportation and production.

SUBSTANCE: method involves localizing deposit zones in well section; estimating current wellhead pressure and yield; applying acoustic action to deposits by downhole acoustic emitter, which generates ultrasonic waves with 15-100 kHz frequency and 0.2-5 W/cm² intensity; lowering emitter to next deposit levels as deposits are removed to recover initial values of wellhead pressure and yield. In marginal wells ultrasonic action is carried out directly after produced fluid removal. In stopped wells produced fluid is injected simultaneously with emitter installation or fluid mixed with methanol with ratio of 1:0.005-1:500 is injected to level, where liquid to be injected flows out of well head.

EFFECT: increased efficiency of deposit removal, decreased power inputs and time.

2 cl, 4 ex