FIELD: well drilling, particularly for reservoir pressure regulation during well drilling.
SUBSTANCE: method involves drilling well bore with drill column provided with drill crown, sensors and remote sensing system in lower part thereof, wherein the remote sensing system receives and transmits temperature and pressure data, including that recorded by sensors, to land-based remote sensing system; performing selective drilling fluid injection from drilling fluid source into drill crown and to annular space via drill column with the use of main pump; providing drilling fluid supply pipeline communicated with annular space and adapted to supply drilling mud into reservoir for drilling fluid cleaning; selectively increasing pressure in annular space with the use of drilling fluid backpressure system connected with drilling fluid supply pipeline, wherein the drilling fluid backpressure system includes flow meter, drilling fluid nipple, backpressure pump and drilling fluid source; providing pressure control system to receive drilling data including drill column weight acting on drill crown, drill column torque acting on drill crown, drilling fluid weight, main pump pressure, backpressure pump pressure, drilling fluid flow rate, drill column penetration rate, drill column rotary speed and sensor data transmitted by remote sensing system. Pressure control system also controls pressure in annular space during drilling work performing, simulates prospective well bore pressure to provide continuous drilling and controls main pump and drilling fluid backpressure system in response to existent pressure in annular space and to prospective well bore pressure.
EFFECT: increased well pressure stability under any drilling conditions.
8 cl, 9 dwg
