Apparatus for vibrating a pipe string in a borehole
AssigneeShell Oil Company
InventorsRobert N. Worrall, Ivo P. J. M. Stulemeijer
Life of this patent
Estimating the term…
Abstract
A jarring apparatus is provided for vibrating a pipe string in a borehole. The apparatus thereto generates at a downhole location longitudinal vibrations in the pipe string in response to flow of fluid through the interior of said string.
Claims20
An apparatus for vibrating a drill string having a central axis in a borehole, the apparatus comprising means for generating at a downhole location longitudinally directional vibrations along the central axis of the drill string in response to flow of fluid through the interior of said drill string and a shock absorbing element mounted in the drill string between the apparatus and a drill bit carried by said drill string effective to substantially isolate the drill bit from the vibration induced in the drill string.
An apparatus for vibrating a drill string having a central axis in a borehole, the apparatus comprising:
- means for generating at a downhole location longitudinal vibrations along the central axis of the drill string in response to flow of fluid through the interior of said drill string, said means for generating said vibrations comprising:
- a Moineau-type hydraulic motor comprising:
- a stator part forming part of the drill string;
- a rotor part;
- and
- a device coupled to the rotor part which axially moves the rotor part relative to the stator part during the course of each rotation of the rotor part relative to the stator part, said device comprising a pair of percussion rings having mating surfaces which have in circumferential direction a rugged profile, one of said rings being connected to said rotor part, the other ring being connected to said stator part.
An apparatus for vibrating a pipe string having a central axis in a borehole, the apparatus comprising:
- a moineau-type hydraulic motor comprising:
- a central bore;
- a stator part comprising pair of interconnected stator sections which form part of the drill string;
- a rotor part comprising a pair of interconnected rotor sections which surround said stator sections;
- a pair of moineau motor sections, each comprising one of said rotor sections paired with one of said stator sections and presenting cooperating moineau profiles with opposite pitches, different average pitch radii;
- and substantially the same eccentricity;
- a common inlet located between said moineau motor sections and in fluid communication with the central bore through both stator sections;
- and
- means for diverting the flow to regulate the amount of drilling fluid transferred via the central bore and the common inlet into each of the moineau motor sections;
- and
- a device coupled to the rotor part which axially moves the rotor part relative to the stator part during the course of each rotation of the rotor part relative to the stator part, said device comprising:
- a pair of percussion rings having mating surfaces which have a circumpherential direction a rugged profile, one of said rings being connected to the rotor part and the other ring to the stator part.
An apparatus for vibrating a drill string having a central axis in a borehole, the apparatus comprising a means for generating at a downhole location longitudinal vibrations along the central axis of the drill string in response to the flow of fluid through the interior of the drill string, said vibration generating means comprising:
- a moineau-type hydraulic motor comprising:
- a central bore;
- a stator part forming a motor housing as a part of the drill string;
- a rotor part mounted inside the motor housing;
- and
- a device coupled to the rotor part which axially moves the rotor part relative to the stator part during the course of each rotation of the rotor part relative to the stator part, said device comprising:
- a pair of percussion rings having mating surfaces which have a rugged profile in a circumferential direction, one of said rings being connected to the rotor part and the other ring to the stator part.
A method of feeding a drill string through a non-vertical section of borehole comprising:
- generating at a downhole location a longitudinally directional vibration along the central axis of the drill string by oscillating a body in an axial direction relative to the drill string in response to flow of fluid through the interior of the drill string, said vibrations preventing frictional sticking of the drill string against the borehole wall;
- isolating a drill bit at the end of the drill string from the effects of the vibration during drilling operations;
- and
- moving the pipe longitudinally in the borehole.
An apparatus for vibrating a drill string having a central axis in a borehole, the apparatus comprising:
- means for generating at a downhole location longitudinal vibrations along the central axis of the drill string in response to flow of fluid through the interior of said drill string, said means for generating said vibrations comprising:
- a hydraulic motor comprising:
- a stator part forming part of the drill string;
- a rotor part;
- and
- a device coupled to the rotor part which axially moves the rotor part relative to the stator part during the course of each rotation of the rotor part relative to the stator part, said device comprising a pair of percussion rings having mating surfaces which have in circumferential direction a rugged profile in a sinusoidal shape, one of said rings being connected to said rotor part, the other ring being connected to said stator part.
Dependencies are inferred from the claim text.