METHOD OF WELL HEAD PRESSURISING AND FACILITY FOR IMPLEMENTATION OF THIS METHOD Russian patent published in 2009 - IPC E21B33/68 E21B47/01 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to equipment for well head pressurising and can be implemented at geophysical survey in horizontal wells with excess pressure at well head by means of geo-physical instruments connected to flow string of small diametre and lowered into well on geo-physical cable together with flow string. When instruments and pipes pass through the well head, pressurising is performed by means of a tube preventer and pipe pressurising facilities. When the geo-physical cable passes through the well head, well head pressurising is performed by means of a cable preventer and attached lubricator. Transition from pressurising with one elements of equipment to pressurising with other elements of equipment is carried out using a special three-coupling branch, arranging it so, that closed die-heads of the pipe preventer are located between two lower couplings of the branch, while the upper coupling is located above an upper flange of pipe pressurising facilities.

EFFECT: expanding functionality at performing survey of horizontal wells and increasing reliability of well head pressurising in process of survey.

5 cl, 3 dwg