초록 ▼

An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resist premature engagement of the cutter arms (4

An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resist premature engagement of the cutter arms (40) and to return the cutters (40) to the body upon conclusion of the underreaming job. Skewed longitudinal grooves (45) are formed in the tubular body thereby permitting the flowpath through the underreamer to provide substantially the same inner diameter throughout the tool (5).

대표청구항 ▼

An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resist premature engagement of the cutter arms (4

An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resist premature engagement of the cutter arms (40) and to return the cutters (40) to the body upon conclusion of the underreaming job. Skewed longitudinal grooves (45) are formed in the tubular body thereby permitting the flowpath through the underreamer to provide substantially the same inner diameter throughout the tool (5). 11. The system according to claim 10, wherein a first predetermined fluid pressure in the third flowpath displaces the member to a corresponding first selected one of the predetermined positions and a second predetermined fluid pressure in the third flowpath displaces the member to a corresponding second selected one of the predetermined positions. 12. A method of controlling operation of multiple well tool assemblies positioned in a well, the method comprising the steps of: interconnecting a control module to each of the well tool assemblies, the control module including a member displaceable to multiple predetermined positions, each of the predetermined positions corresponding to one of the well tool assemblies for operation thereof; interconnecting the control module in a tubular string, thereby making an internal flow passage extending through the control module member a portion of an internal flow passage of the tubular string; and displacing the control module member to a selected first one of the predetermined positions utilizing pressure in a first flowpath connected to the control module, thereby selecting a first one of the well tool assemblies for operation thereof. 13. The method according to claim 12, further comprising the step of providing fluid communication between a second flowpath connected to the control module and an actuator of the first selected well tool assembly in response to the displacing step. 14. The method according to claim 13, wherein the fluid communication providing step further comprises providing the fluid communication through a fluid passage of the control module member. 15. The method according to claim 14, further comprising the step of displacing the control module member to a second selected one of the predetermined positions, thereby providing fluid communication through the fluid passage between the second flowpath and an actuator of a second one of the well tool assemblies for operation thereof. 16. The method according to claim 12, wherein the displacing step further comprises displacing the control module member against a force exerted by a biasing device, the force increasing in response to displacement of the control module member. 17. The method according to claim 16, wherein the displacing step further comprises utilizing a first predetermined pressure in the first flowpath to displace the control module member a first predetermined distance to the first predetermined position against a first predetermined force exerted by the biasing device. 18. The method according to claim 17, further comprising the step of displacing the control module member against a second predetermined force exerted by the biasing device to a second one of the predetermined positions utilizing a second predetermined pressure in the first flowpath, thereby selecting a second one of the well tool assemblies for operation thereof. 19. The method according to claim 12, wherein the displacing step further comprises utilizing a ratchet mechanism to control displacement of the control module member in response to pressure in the first flowpath. 20. The method according to claim 12, wherein the displacing step further comprises displacing the control module member in response to a differential between pressure in the first flowpath and pressure in a second flowpath connected to the control module. 21. The method according to claim 20, further comprising the steps of: interconnecting a selector module between a third flowpath and the first and second flowpaths; generating a first pressure in the third flowpath less than a predetermined pressure, thereby causing the selector module to permit fluid communication between the third flowpath and one of the first and second flowpaths; and generating a second pressure in the third flowpath greater than the predetermined pressure, thereby causing the selector module to permit fluid communication between the third flowpath and the other of the first and sec ond flowpaths.