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II. IEA GEOTHERMAL R&T PROGRAMME ANNEX VII 1. 502 m - Stuck pipe/twist off at 271 m, 123 non-productive fishing hours. 2. 195 m - Pull out to shallower depth to drill around fish. 3. 896 m - Run and cement casing, treat wellhead, 88 hours. 4. 1655 m - Run and cement 12.25" casing, ream and test well, 143 hours. 5. 1460 m - Clean out cement, prepare BHA for directional drilling. 6. 2853 m - Twist off at 1820 m, retrieve part of fish, 155 non-productive hours. 7. 1993 m - Set cement plug, try to sidetrack around fish, 192 non-productive hours. 8. 1491 m - Pull out of hole to drill second leg. 9. 3016 m - Lost pressure, twisted off, fish and tear down rig, 79 non-productive hours. Figure 5.3 Flat time “events” encountered in a well. design criteria for the drilling and completion programs, drilling practices for cost avoidance, problem diagnosis and remediation during slimhole drilling, trouble avoidance, well testing, geophysical logging and wellbore preservation. The current status of the development of a "best practices" Handbook for geothermal drilling is as follows. Sverrir Thorhallsson (Orkustofnun, Iceland) has prepared a list of references that he uses for his drilling classes, as well as a draft Table of Contents for the Handbook. Mexico (CFE) has confirmed its intention to maintain its joint leadership role (with Iceland) for this Subtask. 5.2.3 Subtask C- Advanced Drilling Collaboration (Subtask Leader: Ed Hoover (to July 2004), Jack Wise (to early 2005); Steve Bauer (from early 2005), Sandia National Laboratories (SNL), USA) The participants will monitor and exchange information on drilling technology development and new applications in their respective countries. The participants will also identify activities and projects for collaboration, and then collaboration plans will be developed. For example, the participants anticipate identifying opportunities to field-test in one country a technology/system that is being developed in another participant’s country. The Advanced Drilling Collaboration is focusing on potential opportunities for collaborative field tests, particularly in Iceland and Mexico. Sverrir Thorhallsson has outlined upcoming work for the Iceland Deep Drilling Project (IDDP), whose first phase was scheduled to begin in December 2004. This work will involve completions to depths as great as 5 km. He expressed particular interest in collaborative efforts (e.g. with Sandia) to develop suitable IEA Geothermal R&T Annual Report 2004.doc 37PDF Image | Geothermal Energy Annual Report 2004
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