Integrated BHA Concept of the Latest Generation Rotary Closed-Loop System for Hole Sizes from 5 7/8" to 18 ¼"

Hahne, Ulrich; Risdal, Georg; Ruszka, Jon; Wahlen, Liv Sivertsen

doi:10.2118/87168-ms

Cited by 12 publications

(6 citation statements)

References 6 publications

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“…Downhole steering actuators can be divided into two categories according to steering principle: adjustable stabilizer and adjustable bending sub (or shaft). Some downhole steering/propulsion actuators are hydraulically powered [1][2][3], while others are powered by electric motors [4][5][6].…”

Section: Automatic Directional Drillingmentioning

confidence: 99%

“…For point-the-bit system, dynamic downhole conditions make it difficult to precisely control the bit shaft eccentricity or offset. The system is also slower to respond to required trajectory changes and overall dogleg severity capability is lower than that of a push-the-bit system [3]. The rotary closed-loop system (RCLS) developed by Baker Hughes Inc. controls well trajectory by three near bit hydraulically powered expandable ribs, which generate a radial steering contact force from bore hole wall [3].…”

Section: Rotary Steerable Systemmentioning

confidence: 99%

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Downhole Propulsion/Steering Mechanism for Wellbore Trajectory Control in Directional Drilling

Liu

Feng

2013

AMM

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Advanced directional drilling, especially rotary steerable systems, provides directional control of wellbore while continuously rotating the drill bit. Downhole propulsion/steering mechanism is one of the key components in rotary closed-loop drilling system. Downhole steering/propulsion mechanisms currently used for directional control include adjustable stabilizer, steerable downhole motor and steering actuators used in state-of-the-art rotary steerable systems. The novel electro-mechanical propulsion and steering mechanisms are introduced, in order to produce downhole weight on bit (WOB) and directional control of the drill bit while rotating it as well. The mechanisms are based on high-reduction ratio planetary gear system and DC motor. This propulsion/steering mechanism introduces a unique rotary steering method with a manner of turning screw inside borehole. As a downhole propulsion/steering mechanism, it can be integrated with an existing MWD system to provide directional control and downhole propulsion force on drill bit.

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Section: Automatic Directional Drillingmentioning

confidence: 99%

Section: Rotary Steerable Systemmentioning

confidence: 99%

Downhole Propulsion/Steering Mechanism for Wellbore Trajectory Control in Directional Drilling

Liu

Feng

2013

AMM

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“…The RCLS steering mechanism was seen as allowing for superior directional control throughout the well path and when well trajectory changes were necessary, the bi-directional communication capabilities would deliver directional changes instantaneously. Another consideration in the RCLS selection was its continuous steering capabilities that would minimize wellbore tortuosity [Hahne 2004]. In ERD wells, doglegs in upper hole sections result in insurmountably high torque and drag issues.…”

Section: Planning For Change: the Need For Rotary Steerablementioning

confidence: 99%

Combining Seismic Models with Realtime LWD Measurements to Reduce Geologic Uncertainty: A Case Study of the Mars A-8 Extended Reach Well

Weiland

Cuttitta

Soto

et al. 2010

SPE Annual Technical Conference and Exhibition

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In January of 2008, Shell began drilling an extended reach exploration well from the Mars tension leg platform (TLP). This was an ambitious undertaking with targets nearly 20,000 ft (6,096 m) away in an unexplored fault block. Because of the high inclination of the borehole and the shallow depth of the objective sands, any geological uncertainty in the targets jeopardized the success of the project.While surface seismic is used to evaluate potential targets, it lacks the resolution needed to reliably place those targets. Different seismic processing techniques are available, but the validation of each model requires additional information. True vertical depth (TVD) and true vertical thickness (TVT) synthetic ties created from realtime logging data can improve that resolution. By employing a method that uses TVT, the synthetic ties better match the seismic model allowing for updates to the well path and precise placement inside the target. Multiple velocity models are also incorporated to obtain better time-to-depth relationships and to better predict pore pressure anomalies.In extended reach wells, small issues in the beginning can escalate into more serious problems at total depth. The well path, dogleg severity, and casing shoe placements must be optimized, leaving room for the possibility of changes due to unexpected events. Bottom hole assembly (BHA) design is also a key success factor. Acquiring the needed information in realtime to update the seismic model, while also factoring in tool reliability and planning for shoe-to-shoe performance, is critical. Further, at these high angles, it is important to drill a smooth and continuous borehole to reduce torque and allow for better casing runs. This paper describes how the geological, mechanical, and economical uncertainties were identified and minimized through well planning and the use of realtime data. Specifically, this paper addresses those uncertainties, associated risks, and the methods to minimize them in the A-8 well.The authors examine the pre-well work undertaken with the seismic data and how the BHA and well plan were designed to allow for possible changes. In addition, they will discuss how all the data were used to continually update the model and reduce geologic uncertainty as the targets were approached. Answers were provided in time to update the well path, increasing the chances for success, and ultimately meeting the well objectives.

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“…The modular tools made it possible to customize the BHA for application requirements. Hahne, et al 1 , have described in an earlier paper the work that has led to the development of the integrated BHA concept and its service benefits.…”

Section: Rotary Steerable Systemsmentioning

confidence: 99%

Troll Oil Drilling; Step Changes Through Application Of Front End Technology

Skarsbø

Soltveit

Ernesti

2005

Offshore Technology Conference

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TX 75083-3836, U.S.A., fax 01-972-952-9435. AbstractDrilling on the Troll Oil field has been challenged by the need for long and extensive horizontal hole sections while strictly controlling true vertical depth.The horizontal reach has been extended from initially about 800 meters to more than 4,400 m in a single well bore using the latest generation of Rotary Steerable Systems. At the same time, multilateral drilling technology has become a standardized application on Troll with up to four reservoir sections completed per well.

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Integrated BHA Concept of the Latest Generation Rotary Closed-Loop System for Hole Sizes from 5 7/8" to 18 ¼"

Cited by 12 publications

References 6 publications

Downhole Propulsion/Steering Mechanism for Wellbore Trajectory Control in Directional Drilling

Downhole Propulsion/Steering Mechanism for Wellbore Trajectory Control in Directional Drilling

Combining Seismic Models with Realtime LWD Measurements to Reduce Geologic Uncertainty: A Case Study of the Mars A-8 Extended Reach Well

Troll Oil Drilling; Step Changes Through Application Of Front End Technology

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