New Developments in Drill Stem Rotary Shoulder Connections

Jellison, Michael J.; Hassmann, Steve; Doug, Snapp

doi:10.2523/62785-ms

Cited by 14 publications

(6 citation statements)

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“…It also eliminates the recess present in other connections where cement and solids can be trapped. (4) As more severe drilling applications were encountered, it became clear that connections with higher torsional capabilities and more streamlined configurations were required.…”

Section: Evolution Of Double-shoulder Connectionsmentioning

confidence: 99%

“…(4) To achieve performance beyond 1 st Gen. DSC's, engineers realized changes to the standard API RSC design parameters were necessary. Enhanced thread forms with lower peak stresses, reduced tapers to increase shoulder areas and tighter tolerances were necessary to increase torsional performance and further streamline connection dimensions.…”

Section: Evolution Of Double-shoulder Connectionsmentioning

confidence: 99%

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Drill Faster, Deeper, and Further With Ultrahigh-Torque, Third-Generation Double-Shoulder Connections

Chandler¹,

Muradov²,

Jellison³

et al. 2007

Proceedings of SPE/IADC Drilling Conference

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TX 75083-3836 U.S.A., fax 1.972.952.9435. AbstractNew developments in drilling tubulars are rapidly evolving and represent enabling technologies for the industry's continued advancement of drilling deeper, further and more cost-effective wells. Much focus has been made toward the advancement of drill pipe connection technology to permit high torque drilling of extended reach, directional and horizontal wells. First and second generation high torque connections have been available to the industry for several years.In today's rig market; deepwater, extended reach and ultradeep wells dictate large spread rates that can benefit significantly from reduced tripping times. These same wells often have mechanical and hydraulic load requirements for which today's high torque connections may not be specifically optimized.In response to this need, the development of third generation, ultra-high torque connections is now complete. This paper will present the results of a 2-1/2 year comprehensive effort to design, test, manufacture and field trial a family of connections that were engineered to meet the specific needs of each drill pipe size. Results from extensive laboratory tests and two field trial programs designed to produce harsh, aggressive dynamic loads to the connections are presented.The thread form is a double-start thread that reduces the number of revolutions to assemble the connection by 50%. The thread form also provides a unique dual-radius thread root that offers a step change improvement in fatigue resistance. Conservative estimates suggest that the new connections will save approximately 7-1/2 hours in planned trip time per 20,000 ft well. The new connections provide increased mechanical and hydraulic performance compared to second generation high torque connections while also providing fatigue performance greater than standard API connections.These connections can facilitate more challenging wells, provide increased cost savings and reduce risk during the well construction process.

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Section: Evolution Of Double-shoulder Connectionsmentioning

confidence: 99%

Section: Evolution Of Double-shoulder Connectionsmentioning

confidence: 99%

Drill Faster, Deeper, and Further With Ultrahigh-Torque, Third-Generation Double-Shoulder Connections

Chandler¹,

Muradov²,

Jellison³

et al. 2007

Proceedings of SPE/IADC Drilling Conference

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“…A secondgeneration double-shoulder tool joint configuration provides an ideal location for coil placement. 11 The coil is installed in a protecting groove in the secondary torque shoulder. The corresponding coils create a non-contacting inductive coupler that transmits the signal across the tool joint interface.…”

Section: Telemetry Drill Pipe Systemmentioning

confidence: 99%

Telemetry Drill Pipe: Enabling Technology for the Downhole Internet

Jellison

Hall²,

Howard

et al. 2003

All Days

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Drill pipe capable of transmitting high-bandwidth data from downhole sensors and surface control signals back to those sensors has been developed and successfully tested. The system incorporates a high-speed data cable that runs the length of each joint and downhole tool. The cable terminates at induction coils that are installed in protecting grooves machined in the secondary torque shoulders of doubleshoulder tool joints at each end of the pipe. The coils are recessed in ferrite troughs that focus the magnetic field. The system is virtually transparent to standard rig procedures and offers robust, reliable operation.The paper provides background data on prior work relating to telemetry drill pipe and contrasts the results of these efforts with the new system. The new system has successfully demonstrated data transmission rates of up to 2,000,000 bits/sec. Current mud pulse telemetry is limited to 8 to 10 bits/sec. Electromagnetic technology provides data rates of up to 100 bits/sec, but suffers from hole depth and formation related electric impedance limitations. Full realization of system benefits requires further development of additional drill stem components with highspeed telemetry capabilities including HWDP, collars, jars and top drive subs. A top drive sub that incorporates the telemetry design has been successfully manufactured and tested and is described in the paper. Development efforts relating to other drill stem components are also detailed. The system has been tested in a laboratory environment and in test wells. Results of these tests along with plans for field-testing in actual drilling environments are presented.Telemetry drill pipe can improve well and field productivity by providing more complete, real-time logging information and reduce drilling time and costs and enhance well control by providing real-time downhole drilling data and early kick detection.

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“…This often translates into higher mechanical loads -both torque and tension -acting on the drill string. As a result, a shift in the market is reflected by the introduction of several new technologies and enhanced-feature tools to meet the increased demands [1] [2] . High-torque drill strings, torque reducing subs, and rotary steerable systems all aim at increasing the available capacity under given geometric design constraints [3] .…”

Section: Introductionmentioning

confidence: 99%

Application of Increased Make-up Torque on API Rotary-Shouldered Connections: Goodman Diagram vs. Strain Life Model

McCarthy¹,

Everage²,

Lee³

2004

Proceedings of IADC/SPE Drilling Conference

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fax 01-972-952-9435. AbstractThis paper details the evaluation of rotary shouldered connection (RSC) fatigue performance by comparing the widely used Modified Goodman Diagram (MGD) to a more advanced and accurate elastic-plastic Strain Life Model (SLM). The technical approach defined in this paper challenges the application of the MGD for made-up API rotary shouldered connections. Likewise, the approach challenges the general assumption that the make-up torque (MUT) values defined in API RP7G are set in stone. These make-up torque values do, however, have a consistent basis. Understanding this basis, the state of stress in the connection and how a rotary shouldered connection functions, allows us to use the mechanics of the connection to our advantage. Such an assessment recently led to a justification for increasing the make-up torque on an API NC-50 connection for a major operator while drilling a challenging directional well in the Gulf of Mexico. This example is reviewed in light of both the MGD and the SLM. A concerted effort to understand and evaluate the connection performance allowed application of increased MUT for reaching TD without having to lay down drill pipe and incur the cost associated with switching to a high-torque rental string. Any operator or service provider can utilize the evaluation techniques presented in this paper to assess the impact a controlled increase in make-up torque may have on a rotary shouldered connection.

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New Developments in Drill Stem Rotary Shoulder Connections

Cited by 14 publications

References 0 publications

Drill Faster, Deeper, and Further With Ultrahigh-Torque, Third-Generation Double-Shoulder Connections

Drill Faster, Deeper, and Further With Ultrahigh-Torque, Third-Generation Double-Shoulder Connections

Telemetry Drill Pipe: Enabling Technology for the Downhole Internet

Application of Increased Make-up Torque on API Rotary-Shouldered Connections: Goodman Diagram vs. Strain Life Model

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