| 摘要 |
A method includes inserting a vibration damper tool in a drill string, the damper includes a tubular housing having an exterior surface and a longitudinal passageway, and at least one fluid actuated piston assembly. The piston assembly includes an extendable piston, a transverse passageway, a spring chamber in the transverse passageway, and at least one spring disposed in the spring chamber. The spring biases the piston in a refracted position. The drill string and dampening tool are inserted into a wellbore, fluid is flowed down the drill string and exerts pressure on a proximal end of the piston, and creates a fluidic force sufficient to overcome a biasing retractable force of the spring to extend the piston longitudinally until a distal end of the piston contacts a sidewall of the wellbore. |
| 主权项 |
1. A vibration damper tool for a down hole drill string, said damper tool comprising:
a tubular housing connectable at each end to components of a drill string, said tubular housing having an exterior surface on an exterior wall, a longitudinal passageway, and a transverse passageway extending radially away from the longitudinal passageway in the tubular housing; at least one fluid actuated piston assembly, said piston assembly including:
a piston positioned in the transverse passageway extending radially away from the longitudinal passageway in the tubular housing, said piston having:
a piston body with a longitudinal axis and a distal end and a distal portion, said distal portion positioned in an opening through the exterior wall of the tubular housing and a proximal end and a proximal portion, said proximal portion in fluidic connection with the longitudinal passageway of the tubular housing, anda circumferential ring disposed perpendicular to the longitudinal axis and around the piston body between the distal end and the proximal end, said ring having a maximum outer diameter greater than a maximum outer diameter of the distal portion of the piston and a maximum outer diameter of the proximal portion, and the maximum outer diameter of the proximal portion being greater than the maximum diameter of the distal portion, and said ring having a first lateral face perpendicular to the longitudinal axis and a second lateral face perpendicular to the longitudinal axis; anda piston cap removably positioned in a distal end of the transverse passageway, said piston cap having a bore having a first portion disposed distally away from the longitudinal passageway, said first portion of the piston cap bore having a diameter sized to receive the distal end portion of the piston and allow at least a portion of the distal portion of the piston to pass therethrough, and a second portion of the bore of the piston cap disposed proximally toward the longitudinal passageway, said second portion of the piston cap bore having a diameter sized to receive the proximal portion of the piston;a spring chamber defined by the second portion of the piston cap bore and at least a portion of the distal portion of the piston and the first lateral face of the circumferential ring; andat least one spring disposed in the spring chamber wherein a first end of the spring contacts the first lateral face of the circumferential ring and a second end of the spring contacts at least a portion of the spring chamber. |
