Advanced Torque and Drag Considerations in Extended-Reach Wells
- M.L. Payne (Arco E&P Technology) | F. Abbassian (BP Exploration)
- Document ID
- Society of Petroleum Engineers
- SPE Drilling & Completion
- Publication Date
- March 1997
- Document Type
- Journal Paper
- 55 - 62
- 1997. Society of Petroleum Engineers
- 1.12.3 Mud logging / Surface Measurements, 3 Production and Well Operations, 1.12.6 Drilling Data Management and Standards, 1.5 Drill Bits, 1.1.3 Trajectory design, 1.10 Drilling Equipment, 1.6 Drilling Operations, 1.12.1 Measurement While Drilling, 2.2.2 Perforating, 1.4.4 Drill string dynamics, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.11 Drilling Fluids and Materials, 1.4 Drillstring Design, 1.4.1 BHA Design, 3.3.1 Production Logging, 1.6.6 Directional Drilling, 1.6.1 Drilling Operation Management, 1.14 Casing and Cementing
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Excessive torque and drag can be critical limitations in Extended-Reach Drilling (ERD). This paper details issues related to torque and drag prediction, monitoring, and management in ERD wells. Results are presented from sensitivity analyses of extreme ERD trajectories such as 7 to 8 km departures at 1600 m TVD. Several such wells have now been successfully drilled at BP's Wytch Farm oil-field using results from these studies. In such high-angle ERD wells, compression generated in the drillpipe during tripping and sliding operations can exceed the critical buckling load and cause the drillpipe to buckle. As a result, buckling initiation and post-buckling analyses are used to quantify the extent and severity of buckling and the associated increases in drag forces and pipe stresses. The paper addresses the importance of drilling data in calibrating torque/drag models in order to capture the continual changes in drilling parameters and operating conditions. The paper presents a number of field case studies where analyses have been conducted to directly assist drilling operations. This paper should be of high interest to engineers executing, planning, or evaluating ERD operations.
Torque and upward drag must be projected for ERD operations to ensure the rig's rotary and hoisting equipment are adequately sized and the drillstring is properly designed. Downward drag must be projected to evaluate the limits for sliding oriented drilling motors and running tubulars A key aspect of these projections is to ensure good accuracy with some level of conservatism, without incurring excessive overdesign. Various components can contribute to the buildup of both torque and drag in ERD operations. Identifying and quantifying these distinct components is an important part of properly projecting torque and drag. The acquisition and analysis of field data is critical in this process. When careful analysis and forecasting has identified torque or drag as a limiting factor, effective measures must be available to alleviate the specific operational constraint. These measures include both torque/drag reduction and alternative means to achieve the desired operation.
Torque/drag has been addressed in various industry publications over the years. This paper provides additional understanding and observations on torque/drag issues as a result of theoretical and empirical analyses of extreme ERD operations. These analyses were performed in support of BP's Wytch Farm ERD development, which has set a number of world-record achievements. This paper presents both field data and modeling predictions to convey key torque/drag Issues. Topics covered include torque/drag projection, analysis, variability, control and management. In addition to drilling torque/drag issues, the paper covers other important operations such as liner rotation while cementing and completion operations. The purpose of the paper is to highlight key lessons and observations on torque and drag as they impact world-class ERD operations.
|File Size||387 KB||Number of Pages||8|