WELLHEAD LOCK (VERSIONS) Russian patent published in 2001 - IPC

FIELD: oil and gas producing and mining industry; applicable in quick opening of suspended or stripped oil, gas and hydrogeological wells and mines used as storages. SUBSTANCE: wellhead lock has gate and hollow branch pipe located under it. Gate is located above upper flange of wellbore. Branch pipe is telescopically installed in wellbore and connected with wellbore flange by destructible connection. Height of branch pipe is larger than distance from upper flange of wellbore to ground surface. Gate is hinged with upper end of branch pipe and additionally secured to it by destructible connection. Installed inside wellbore is a source of high-pressure gases. According to the second version, hollow branch pipe is telescopically installed into wellbore. Lock has one or several additional hollow branch pipes. Upper flange of wellbore is connected by destructible connection with the first extensible additional hollow branch pipes. Upper end of upper branch pipe is hinged to gate by destructible connection. Total height of branch pipes exceeds distance from upper flange of wellbore to ground surface. EFFECT: prevention of emergency situations and higher productivity. 5 dwg