摘要:
The drilling direction control device includes a rotatable drilling shaft, a housing for rotatably supporting a length of the drilling shaft, and a deflection assembly contained within the housing for bending the drilling shaft between a first support location and a second support location. The deflection assembly includes an outer ring which is rotatably supported on a circular inner peripheral surface of the housing and which has a circular inner peripheral surface that is eccentric with respect to the housing. The deflection assembly also includes an inner ring which is rotatably supported on the circular inner peripheral surface of the outer ring and which has a circular inner peripheral surface which engages the drilling shaft and which is eccentric with respect to the circular inner peripheral surface of the outer ring.
摘要:
A stabilizer (1) especially adapted for use with an drill string having an eccentric drilling element, such as a bi-center bit. The stabilizer (1) has a pair of circumferentially displaced blades (18) that lie in a common circumferential plane and extend from a rotatable sleeve (20) supported on the stabilizer body (50) , as well as a stationary blade (17). The rotating blades (18) are aligned with the stationary blade (17) when in a first circumferential orientation and are disposed so that the mid-point between the rotating blades (18) is located opposite the stationary blade (17), thereby providing full-gauge stabilization, when the rotating blades (18) are in a second circumferential orientation. A magnetic system (60) senses the circumferential orientation of the rotating blades (18) and transmits the information to the surface via mud pulse telemetry. A piston (141) actuated by the drilling mud locks the rotating blades (18) into the active and inactive positions. A brake shoe (59) located on the distal end of each rotating blade (18) provides contact with the walls of the borehole and serves as a support pad (59) for a formation sensor (45).
a) une machine de forage (10) comprenant un train de tiges (20) ; une tête rotative de coupe (22) ; des moyens mécaniques (48) de correction de trajectoire ; des moyens de détection (46) pour détecter une éventuelle erreur de trajectoire ; et des premiers moyens de transmission d'informations (52) entre la surface du sol et les moyens de détection ; b) une station intermédiaire (12) montée sur ou à proximité desdits moyens d'entraînement comprenant des premiers moyens émetteurs/récepteurs (55) reliés auxdits premiers moyens de transmission pour recevoir les informations délivrées par moyens de détection et pour transmettre des instructions moyens de correction ; et c) une station de contrôle (14) du fonctionnement de la machine de forage disposée à distance de ladite station intermédiaire comprenant des moyens de traitement des informations reçues de ladite station intermédiaire pour élaborer des instructions de commande de fonctionnement de la machine de forage, y compris éventuellement des moyens de correction de trajectoire.
摘要:
A drilling assembly includes an eccentric adjustable diameter blade stabilizer having a housing (!2) with a fixed stabilizer blade (30) and a pair of adjustable stabilizer blades (40,42). The adjustable stabilizer blades (40,42) are housed within openings (60,62) in the stabilizer housing (12) and have inclined surfaces (88,90) which engages ramps (78,80) on the housing (12) for camming the blades (40,42) radially upon their movement axially. The adjustable blades (40,42) are operatively connected to an extender piston (104) on one end for extending the blades and a return spring (110) at the other end for contracting the blades. The eccentric stabilizer also includes one or more flow tubes (44) through which drilling fluids pass that apply a differential pressure across the stabilizer housing (12) to actuate the extender pistons (104) to move the stabilizer blades (40,42) axially upstream to their extended position. The eccentric stabilizer is mounted on a bi-center (202) which has a eccentric reamer (208) section and a pilot bit (206).
摘要:
In a drilling system of the type comprising a rotatable drilling string (25), a drilling string communication system (378) and a drilling direction control device (20) connected with the drilling string (25), a method is provided for issuing one or more commands to the drilling direction control device (20) utilizing a changeable first parameter associated with the drilling string (25) and a changeable second parameter associated with the drilling string (25). The method includes providing at least one first parameter state, providing at least one first parameter event relating to the first parameter state; providing at least one second parameter state, providing at least one second parameter event relating to the second parameter state and issuing at least one command to the drilling direction control device (20) in response to providing at least one of the first parameter event, the second parameter event, the first parameter state and the second parameter state.
摘要:
A drilling assembly includes an eccentric adjustable diameter blade stabilizer having a housing (!2) with a fixed stabilizer blade (30) and a pair of adjustable stabilizer blades (40,42). The adjustable stabilizer blades (40,42) are housed within openings (60,62) in the stabilizer housing (12) and have inclined surfaces (88,90) which engages ramps (78,80) on the housing (12) for camming the blades (40,42) radially upon their movement axially. The adjustable blades (40,42) are operatively connected to an extender piston (104) on one end for extending the blades and a return spring (110) at the other end for contracting the blades. The eccentric stabilizer also includes one or more flow tubes (44) through which drilling fluids pass that apply a differential pressure across the stabilizer housing (12) to actuate the extender pistons (104) to move the stabilizer blades (40,42) axially upstream to their extended position. The eccentric stabilizer is mounted on a bi-center (202) which has a eccentric reamer (208) section and a pilot bit (206).
摘要:
A milling apparatus which comprises a mill, and a starter bar which depends from said mill, characterised in that said starter bar is detachably connected to said mill.