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AssigneeSmith International, Inc.
InventorWilliam R. Garrett
Estimating the term…
A drill string splined resilient tubular telescopic joint for balanced load deep well drilling comprises a double acting damper having a very low spring rate upon both extension and contraction from the zero deflection condition. Preferably the spring means itself is a double acting compression spring means wherein the same spring means is compressed whether the joint is extended or contracted. The damper has a like low spring rate over a considerable range of deflection, both upon extension and contraction of the joint, but a gradually then rapidly increased spring rate upon approaching the travel limits in each direction. Stacks of spring rings are employed for the spring means, the rings being either shaped elastomer-metal sandwiches or, preferably, roller Belleville springs. The spline and spring means are disposed in an annular chamber formed by mandrel and barrel members constituting the telescopic joint. The spring rings make only such line contact with one of the telescoping members as is required for guidance therefrom, and no contact with the other member. The chamber containing the spring means, and also containing the spline means, is filled with lubricant, the chamber being sealed with a pressure seal at its lower end and an inverted floating seal at its upper end. Magnetic and electrical means are provided to check for the presence and condition of the lubricant. To increase load capacity the spring means is made of a number of components acting in parallel.
Rotary drill string damper comprising a splined, sealed, tubular, telescopic joint including resilient means increasingly strained upon both extension and contraction of the joint from a neutral position and having a like variable spring modulus upon both extension and contraction with a lowest modulus at the neutral position and nearly as low like moduluses at equal departures from neutral position to both sides of the neutral position over a range of such departures and like gradually and then sharply higher moduluses upon increasing equal departures beyond said range upon further extension and contraction of the damper.
Deep drilling vibration damper comprising:
A drill string vibration damper comprising a splined tubular telescopic joint and spring means urging the joint back to a certain position upon both extension and contraction of the joint with equal force exerted by said spring means upon equal departures away from said certain position by extension and by contraction of the joint, said spring means having an increasing spring modulus upon departures from said certain position in both directions.
A drill string vibration damper comprising a splined tubular telescopic joint and spring means urging the joint to a certain position upon both extension and contraction of the joint with equal force exerted by said spring means upon equal departures from said certain position by extension and contraction of the joint, said telescopic joint including a mandrel and a barrel and axially spaced seal means sealing between the mandrel and barrel defining volume between said mandrel and barrel adapted to receive lubricating fluid, said spring means being disposed in said volume, one of said seal means being sliding pressure seal means and the other of said seal means being floating seal means, and magnet means carried by said floating seals means to facilitate determination of the position of the floating seal means.
A drill string vibration damper comprising a splined tubular telescopic joint and spring means urging the joint to a certain position upon both extension and contraction of the joint with equal force exerted by said spring means upon equal departures from said certain position by extension and by contraction of the joint,
Well tool comprising a splined tubular telescopic joint and resilient means to transmit force between axially movable members forming the joint with axially spaced seal means between said members defining a lubricant chamber housing said resilient means, the outer one of said members having a wash pipe extending within the other of said members, one of said seal means being a floating seal disposed between said wash pipe and said other member, said floating seal means being provided with a permanent magnet to indicate its position through said wash pipe, said wash pipe being paramagnetic.
Well tool comprising a splined tubular telescopic joint and resilient means to transmit force between axially moveable members forming the joint with axially spaced seal means between said members defining a lubricated chamber housing said resilient means, said spring means comprising a plurality of elastomer metal sandwichs, each sandwich including upper and lower metal washers with an ovoid cross-section elastomer ring therebetween, each upper washer having a depending flange from one of its inner and outer peripheries and said lower washer having an upstanding flange at its opposite periphery, said flanges overlapping said washers and spacer washers disposed between groups of said sandwiches, the inner peripheral flanges engaging each other and the outer peripheral flanges engaging each other within each group of said washers whereby said sandwichs in each group are in parallel, said spacer washers having inner and outer peripheries clear of the travel paths of said flanges whereby said groups are in series.
Well tool comprising a splined tubular telescopic joint and resilient means to transmit force between axially movable members forming the joint, said resilient means comprising a first variable Hooke's modulus spring means and a second variable Hooke's modulus spring means, said variable Hooke's modulus spring means being separate and in parallel, said tool having a lower spring rate at certain deflections than the spring rate for either of said resilient means alone at the same deflection.
A drill string cushioning tool comprising a telescopic joint including inner and outer tubular members and means to transmit torque between said members and to cushion the transmission of compression from one end of the joint to the other, a plurality of seal means sealing between the members and defining volume between said members adapted to receive lubricating fluid, one of said seal means being sliding pressure seal means and the other of said seal means being floating seal means, and magnet means carried by said floating seal means to facilitate determination of the position of the floating seal means.
A drill string cushioning tool comprising:
Well tool seal cartridge for sealing between an inner tube and an outer tube radially separated therefrom, said cartridge including
Well tool seal cartridge for sealing between an inner tube and an outer tube thereabout radially separated therefrom, said cartridge including a support tube, annular seal means carried by said support tube for sealing with said inner and outer tubes, and radially magnetized annularly disposed permanent magnet means carried by and concentric with said support tube for indicating the axial position of said seal cartridge between said inner and outer tubes.
A drill string damper comprising:
A drill string vibration damper according to claim 34, said means to transmit torque comprising a splined tubular telescopic joint, said resilient means urging the joint back to a certain position upon both extension and contraction of the joint with equal force exerted by said spring means upon equal departures away from said certain position by extension and by contraction of the joint.
A drill string damper comprising a tubular telescopic joint, said telescopic joint including a mandrel member and a barrel member therearound, means to transmit torque between said members while allowing relative axial sliding thereof, and resilient means to transmit axial force through the joint,
Tool useful in earth boring by the rotary system comprising:
Dependencies are inferred from the claim text.