The demand for increased oil and gas recovery requires the drilling of complex extended reach wells with optimized reservoir exposure for production and minimized overall production costs. In order to achieve these objectives, the use of high-end drilling and logging technology to optimize well placement is of the essence. However, the optimal utilization of this technology is often limited by the real-time transmission bandwidth of essential data from and to the downhole tools. The introduction of wired drillpipe technology has facilitated a step change in two-way data communication resulting in a high-speed data transmission giving much greater volume, resolution and quality of formation evaluation data and drilling dynamics data. Furthermore, the direct control of rotary steerable tools has now been enhanced to allow instantaneous programming changes and better utilization of dynamics data to enhance the decision making process required to address drilling dysfunction challenges, hole quality, gross ROP and BHA reliability. The high bandwidth technology was used while drilling two laterals on the Troll field's reservoir in the Norwegian North Sea in 2007. The memory quality data was transferred through wired drillpipe to the surface while geosteering through relatively unconsolidated sandstones with localized zones of hard calcite cementation. The bottom hole assembly employed, comprised multiple formation evaluation and dynamics sensors to fully understand the downhole drilling conditions. The data was transferred to the expert advisory centre onshore for advanced processing and interpretation to enable the critical decision making process. The adoption of a Total Systems Approach to select the ideal combination of application-specific drill bit, drilling system, and appropriate procedures and practices was presented and described by Stavland, et al (2006). Realizing the full benefit of the approach has been hampered by bandwidth restriction and time lag associated with conventional mud pulse telemetry. This paper will discuss how wired drillpipe technology has been utilized to enhance the Total System Approach concept during the first tests and how it will affect operations going forward. Introduction Telemetry Drill String Technology Overview First used in 2003 and commercially launched in 2006, the broadband network used in this application offers an ultra high-speed alternative to current mud pulse and electro-magnetic telemetry methods. The network utilizes individually modified drilling tubulars to provide bi-directional, real-time, drill string telemetry at speeds upwards of 57,000 bits per second. This greatly enhanced band-width in comparison to existing technology makes it possible to obtain large volumes of data from downhole tools (and other measurement nodes along the drill string) instantaneously, greatly expanding the quantity and quality of information available while drilling. The network utilizes a high-strength coaxial cable and low-loss inductive coils embedded within double-shouldered connections in each tubular joint to convey information. Currently available telemetry tubulars include various sizes of range 2 and range 3 drillpipe, heavy-weight drillpipe, drill collars, and a wide array of bottom hole assembly components (API Spec. 5D).
TX 75083-3836, U.S.A., fax 1.972.952.9435. AbstractEconomical demands within the oil and gas industry are the driving force to exact significant advances in Drilling and Formation Evaluation Technology. This has been exemplified by the application of new technology to address the complex challenges of the Troll Field Reservoir in the Norwegian North Sea.Exploiting the Troll reservoir requires horizontal geosteering through relatively unconsolidated sandstones with localized zones of hard calcite-cementation. Optimum well placement is of the utmost importance and demands reduced tolerance for any inaccuracy within the thin oil reservoir column throughout the progressively increasing drained hole section. Consequent to the advancement in drilling technology, the horizontal reach has been extended from some 500 meters to more than 5000 meters in a single reservoir section including horizontal turns of up to 360°.In 2001 an innovative service was introduced to the Troll field, being founded on a new multi-sensor data acquisition and processing Measurement-While-Drilling (MWD) tool. The downhole tool contains various dynamics and mechanical sensors, and a high-speed data processing system to continuously provide an accurate picture of the downhole conditions and the energy transfer train. The service was deployed to optimize the mechanical efficiency of the drilling process by facilitating the immediate response to differing situations encountered while drilling complex heterogeneous formations. This real-time service, but also the intrinsic detailed studies on BHA and bit design with ensuing in-depth knowledge capture have lead to a comprehensive understanding of the Troll drilling challenges and thereby facilitated the design and utilization of application specific bottom hole assemblies with associated relevant drilling procedures and practices. This paper will discuss how this technology is used and how this total drilling system deployment concept has been applied to successfully surmount the specific challenges of the Troll Field.
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