| 摘要 |
FIELD: oil and gas industry. ^ SUBSTANCE: device for retaining well drilling tool in vertical position uses pendulum. Pendulum controls the flow of outlet holes of drilling fluid chambers by directing it to activation pistons of centralisers acting on centraliser plates. At deviation of outer housing from vertical position the pendulum deviates under action of gravity force and occupies hinged position offset at an angle. At that, hydraulic pressure is corrected in one or two outlet holes of one or two drilling fluid chambers; as a result, hydraulic force which acts on one or two pistons making one of centralisers change its position for outer housing to return back to vertical position till pendulum is set to concentric hinge position changes, and balanced pressure equilibrium is recovered in drilling fluid chambers. ^ EFFECT: higher drilling accuracy and operating reliability of device. ^ 10 cl, 8 dwg |
