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Sound Coiled-Tubing Drilling Practices

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Sound Coiled-Tubing Drilling Practices Sound Coiled-Tubing Drilling Practices Final Report (February – August 2001) Prepared for: U.S. DEPARTMENT OF ENERGY NATIONAL ENERGY TECHNOLOGY LABORATORY U.S. DEPARTMENT OF THE INTERIOR MINERALS MANAGEMENT SERVICE Prepared by: Mr. Thomas Williams Mr. Greg Deskins MAURER TECHNOLOGY INC. 2916 West T.C. Jester Houston, Texas Mr. Stephen L. Ward ADVANTAGE ENERGY SERVICES LTD. Mr. Mel Hightower Consulting Engineer TR01-21 September 2001 Disclaimer This report was prepared as an account of work sponsored by agencies of the United States Government. Neither the United States Government nor any agency thereof, nor any of their employees, makes any warranty, express or implied, or assumes any legal liability or responsibility for the accuracy, completeness, or usefulness of any information, apparatus, product, or process disclosed, or represents that its use would not infringe privately owned rights. Reference herein to any specific commercial product, process, or service by trade name, trademark, manufacturer, or otherwise does not necessarily constitute or imply its endorsement, recommendation, or favoring by the United States Government or any agency thereof. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. All applicable federal, state and local governmental rules, regulations or restrictions, now in effect or which my be promulgated, take precedence over the suggestions in this manual. No suggested method, practice, precaution or program set forth in this guide shall be deemed to establish a legal standard of conduct or a legal duty, the violation of which would constitute negligence of any degree in any legal proceeding. - ii - Sound CTD Practices Acknowledgements We gratefully acknowledge the support and contributions of the project managers from the Minerals Management Service (Bill Hauser) and the Department of Energy (Roy Long). A significant volume of technical data was contributed to this manual by Maurer Technology from technical reports and other deliverables of the DEA-67 joint-industry project on coiled- tubing and slim-hole operations. The authors also appreciate the contributions of John Misselbrook of BJ Services, who reviewed the draft manual and provided a variety of very useful comments. - iii - Sound CTD Practices Table of Contents 1. INTRODUCTION........................................................................................................1 1.1 Organization of the Manual .......................................................................................... 1 1.2 Basic Procedure for CTD ............................................................................................. 2 2. PRE-JOB PLANNING – ENGINEERING...................................................................5 2.1 Overview of Engineering Analysis ................................................................................ 5 2.2 Introduction to CTD ...................................................................................................... 6 2.3 Initial Well Research and Planning............................................................................... 7 2.3.1 Well Research.................................................................................................. 8 2.3.2 Well Planning ................................................................................................... 9 2.4 Well and Site Preparation........................................................................................... 11 2.5 CTD Surface Equipment ............................................................................................ 11 2.5.1 Coiled-Tubing Equipment ............................................................................... 12 2.5.1.1 CT String ......................................................................................... 12 2.5.1.2 CT Injector Head.............................................................................. 15 2.5.1.3 CT Reel ........................................................................................... 16 2.5.1.4 CT Power Pack................................................................................ 17 2.5.1.5 Crane and Substructure................................................................... 18 2.5.1.6 Pipe-Handling Equipment ................................................................ 19 2.5.2 Well-Control Equipment.................................................................................. 20 2.5.2.1 Well-Control Equipment Testing ...................................................... 23 2.5.2.2 Well-Control Procedures and Responsibilities ................................. 23 2.5.3 Ancillary Surface Equipment .......................................................................... 24 2.5.4 Monitoring and Recording Equipment............................................................. 25 2.5.4.1 CTU Monitoring Equipment.............................................................. 25 2.5.4.2 Drilling Fluid Monitoring Equipment.................................................. 26 2.5.4.3 Wellbore Steering and Navigation.................................................... 26 2.5.4.4 Formation Evaluation....................................................................... 26 2.5.5 Safety and Emergency Equipment ................................................................. 27 - iv - Sound CTD Practices Table of Contents 2.6 Directional Planning ................................................................................................... 27 2.7 Drilling Fluids and Wellbore Hydraulics ...................................................................... 29 2.7.1 Hole Cleaning and Annular Velocity ............................................................... 33 2.7.2 Hydraulics Program........................................................................................ 34 2.8 Window Milling ........................................................................................................... 35 2.9 Open-Hole Logging .................................................................................................... 38 2.10 Wellbore Tubulars and Wellheads.............................................................................. 38 2.10.1 Wellheads ...................................................................................................... 40 2.10.1.1 New Well ......................................................................................... 40 2.10.1.2 Re-entry Well................................................................................... 42 2.11 Liner Cementing......................................................................................................... 42 3. PRE-JOB PLANNING – ON-SITE ...........................................................................44 3.1 Well Planning/Preparation.......................................................................................... 44 3.2 CT Management and Safe Operations ....................................................................... 48 3.3 Hydraulics .................................................................................................................. 50 3.4 Equipment Maintenance............................................................................................. 51 3.5 Contingencies ............................................................................................................ 52 3.6 Well Control ............................................................................................................... 53 4. OPERATIONS EXECUTION....................................................................................54 4.1 Safety......................................................................................................................... 54 4.2 Data Acquisition ......................................................................................................... 55 4.3 Bottom-Hole Assembly and CT Deployment .............................................................. 56 4.3.1 Typical Bottom Hole Assembly....................................................................... 57 4.3.1.1 CT Connector (CTC)........................................................................ 57 4.3.1.2 Dual Check Valves .......................................................................... 59 4.3.1.3 Hydraulic Disconnect ....................................................................... 59 4.3.1.4 Circulation Sub ................................................................................ 59 4.3.1.5 Non-Rotating Joint........................................................................... 59 4.3.1.6 Orienter and Equalizing Sub ............................................................ 60 4.3.1.7 MWD Equipment.............................................................................. 60 - v - Sound CTD Practices Table of Contents 4.3.1.8 Downhole Mud Motors..................................................................... 61 4.3.1.9 Drilling Bits....................................................................................... 63 4.3.2 Tripping and Wiper Trips ................................................................................ 65 4.4 Drilling Fluid ............................................................................................................... 67 4.5 Window Milling Operations........................................................................................
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