Mitigating Application-Specific Challenges Through a Total System Approach

Stavland, Marianne; Wolter, Henrik; Evans, John G.

doi:10.2118/99122-ms

Cited by 10 publications

(1 citation statement)

References 7 publications

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“…The models play an important role in product optimization and BHA design engineering. The downhole measurement capability has been proven invaluable in numerous drilling applications, both via real-time monitoring and post-job analysis 8 . Visualization of the resulting digital data sets from both modeling and measurement efforts are also of great value for training purposes as it provides the ability to observe the motion of the drillstring downhole.…”

Section: Discussionmentioning

confidence: 99%

Visualization of BHA Dynamics Improves Understanding of Downhole Drilling Conditions, Speeds Up Learning Curve

Jogi

Macpherson

Neubert

et al. 2006

Proceedings of IADC/SPE Drilling Conference

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TX 75083-3836, U.S.A., fax 1.972.952.9435. AbstractThe drilling industry demographics predict a significant loss of expertise in the upcoming years as a high percentage of drilling personnel will reach retirement age. At the same time, drilling activity is predicted to grow driven by high oil prices based on strong demand. As rig rates go up, failures in downhole drilling equipment as a result of downhole conditions will become even more costly, resulting in an increased demand for experienced personnel. There is, therefore, a widening experience gap that needs to be addressed as fast as possible.Over the past few years, the service industry has developed sophisticated downhole 1,2,3 and surface data acquisition systems that can record critical drilling parameters at a level of detail and accuracy not available before. In particular, on the downhole side it is now possible to store significantly more data at a fraction of the cost compared to earlier years. However, while more data are now available, the analysis is still done in the traditional manner via logs or special signal processing systems requiring a high level of expertise. As a result, large amount of data are acquired today, but only few experts are available to do a detailed analysis so that a lot of the data are never looked at.Visualization tools can be a solution to this dilemma. They can provide a much faster learning curve about downhole conditions while drilling. Computer animations facilitate replaying data recorded downhole at a high rate, displaying the motion of a downhole tool inside the borehole. Combining downhole data with BHA modeling software allows the user to review the mechanical loading of the BHA in the section just drilled, and to focus attention on special events or sections as necessary.The paper reviews dynamics data sources and formats available today and present several example displays and animations that show how visualization can aid the process of analyzing large amount of data. In addition to the visualization of recorded data, the paper also presents real-time visualization-while-drilling that is intended to enhance the drilling crew's understanding of the downhole conditions. The paper finishes with a short discussion of the benefits of using animations and visualization tools in training programs and education seminars.

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Section: Discussionmentioning

confidence: 99%

Visualization of BHA Dynamics Improves Understanding of Downhole Drilling Conditions, Speeds Up Learning Curve

Jogi

Macpherson

Neubert

et al. 2006

Proceedings of IADC/SPE Drilling Conference

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Achieving Shoe-to-Shoe Drilling Performance in Hole-Opening Application With Rotary-Steerable Systems

Heisig

Hood

Okewunmi

et al. 2007

SPE/IADC Drilling Conference

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Detailed analysis of downhole weight-on-bit, torque, bending moment and vibration signals measured between bit and hole opener have provided clear insight into the dynamic response of hole opening BHAs in interbedded formations. Based on transmitted real-time information from an advanced downhole multi-sensor data acquisition and processing system, application-specific drilling procedures and guidelines have been developed to avoid or to identify and overcome critical dynamic situations downhole. Applying the new procedures, several hole sections in the GOM were drilled for the first time in one run from casing shoe to casing shoe. Here previous attempts had resulted in failures of the drilling equipment or even in twist-offs. The paper starts with a list of observations made with the downhole multi-sensor tool placed between bit and hole opening device. Log examples with downhole and surface drilling data demonstrate the dynamic response of hole opening BHAs. For the first time, the paper presents downhole measurements showing the changes in weight on bit versus weight on reamer when drilling interbedded formations. Again, log examples are used to document the effect of the drilling procedures that were applied to successfully resolve critical downhole situations. The paper concludes with a summary of the lessons learned in planning and executing hole opening applications with shoe to shoe performance. Introduction Driven by a variety of technical and economic reasons, more and more drilling programs include hole enlargement operations while drilling. In deepwater applications, the ability to enlarge the hole below the last casing shoe allows for tighter tolerance intermediate casings to be run. Figure 1 shows a typically deepwater casing and drilling program, where the intermediate casing strings are instrumental to reach the reservoir with an economically viable production string size. In other applications, hole opening or underreaming techniques are applied to address ECD limitations or to deal with swelling shale or salt formations. Earlier, hole enlargement operations were carried out by first drilling a pilot hole through the interval of interest and then opening it up with a second pass. Today, several enlargement options while drilling are available to eliminate the second pass: Bicenter PDC bits, eccentric reaming-whiledrilling (RWD) or concentric reaming devices1–10. In particular references 3, 9 and 10 discuss at some length the benefits and limitations of the three options for various applications with respect to dynamic stability, reliability, steerability and hole quality. Over the past years, the concentric reaming devices have gained significant market share, in particular in rotary steerable (RSS) applications. Concentric reamers include expandable arms, ribs or blocks, which are mechanically or hydraulically activated, after passing e.g. the last casing shoe8,9. All examples except one presented in this paper feature concentric reaming devices. In general, drilling with a reaming device in the bottom hole assembly (BHA) with the associated lack of stabilization in the BHA in the enlarged borehole above the reamer significantly increases the risk of the drilling operation. In particular, dangerous backward whirl situations with high lateral vibrations can develop and result in failures of BHA components, and subsequently in costly trips or even more costly fishing operations. Several deepwater projects in the GOM suffered significant cost overruns as a result of vibration problems during hole enlargement operations while drilling. In some cases in the GOM and other areas, operators decided to go back to a second run for the hole enlargement operation.

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The First Offshore Use of an Ultrahigh-Speed Drillstring Telemetry Network Involving a Full LWD Logging Suite and Rotary-Steerable Drilling System

Wolter

Gjerding

Reeves³

et al. 2007

All Days

Self Cite

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fax 01-972-952-9435. AbstractDrill string telemetry network technology allowing reliable data transmission at speeds up to 57,600 bits per second has been utilized in many land based drilling applications.The drill string telemetry network incorporates a highstrength data cable that runs the length of each tubular joint. The cable terminates at inductive coils that are installed in the secondary torque shoulder of each connection. As the drill string is assembled, the inductive coils in adjoining tubulars are brought close together allowing data to flow across the connection. The network signal is boosted occasionally by repeater subs, which also provide locations for along-string temperature measurements. The technology offers robust, reliable operation and is virtually transparent to standard rig procedures.In 2007, the Troll field in Norway saw the first commercial deployment of this technology into a complex offshore multilateral drilling project.This paper details the lessons learned and value derived from the use of an ultra-high speed drill string telemetry network and compatible rotary steering, drilling dynamics and advanced formation evaluation measurement tools while drilling multiple laterals of an extended reach horizontal well from a semi-submersible drilling rig.Of particular focus will be discussion of the specific value gained from: real-time analysis of high resolution dynamics and inclination measurements to instantly manage the drilling transition between relatively unconsolidated sands with imbedded hard calcite-cemented stringers; instantaneous network-enabled surface control of rotary steerable tools to eliminate non-productive time and improve directional control; real-time transmission and interpretation of highvolume, memory quality formation evaluation measurements to improve geological well placement; and non-productive time elimination resulting from the availability of full telemetry redundancy.The paper includes comment and perspective from the Troll field operator regarding the immediate value and likely future utilization of telemetry drill string technology.

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Mitigating Application-Specific Challenges Through a Total System Approach

Cited by 10 publications

References 7 publications

Visualization of BHA Dynamics Improves Understanding of Downhole Drilling Conditions, Speeds Up Learning Curve

Visualization of BHA Dynamics Improves Understanding of Downhole Drilling Conditions, Speeds Up Learning Curve

Achieving Shoe-to-Shoe Drilling Performance in Hole-Opening Application With Rotary-Steerable Systems

The First Offshore Use of an Ultrahigh-Speed Drillstring Telemetry Network Involving a Full LWD Logging Suite and Rotary-Steerable Drilling System

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