Relating Slim-Hole Drilling Performance to South Louisiana Drilling Problems
- Jan N. Pedersen (The California Co.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- October 1959
- Document Type
- Journal Paper
- 17 - 20
- 1959. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 1.12.3 Mud logging / Surface Measurements, 1.6 Drilling Operations, 1.10 Drilling Equipment, 5.6.1 Open hole/cased hole log analysis, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 1.5 Drill Bits
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Slim-hole drilling has been utilized in many areas of the world to reduce drilling costs. It has been used successfully in exploratory as well as in development drilling, and many published articles have pointed to the savings made possible with slim-hole drilling. Until the present, however, very little slim-hole drilling has been attempted in South Louisiana, principally because of the deep drilling depths and the complex hole problems encountered. Deeper drilling and complex hole problems mean higher costs which may make certain exploratory drilling prospects unattractive or may preclude further development of oil or gas discoveries. This paper recounts some of the advantages of slim-hole drilling and suggests how proper application of slim-hole drilling techniques could appreciably reduce exploratory and development drilling costs in South Louisiana.
The uses of slim-hole drilling are listed in Table 1. It is significant to note that the slim hole is not intended to replace the conventional-size hole. The smaller diameter hole imposes restrictions on formation evaluation tools, fishing tools and completion tools, and these limitations should be recognized when planning slim-hole drilling. However, these limitations can be tolerated if the wells fall within the categories listed in Table 1.
Certainly there are many opportunities for drilling cost reductions through slim-hole drilling in South Louisiana. However, recognition of limitations and careful planning to operate within these limitations are essential to any slim-hole drilling operation.
Drill Tubing Increases Rig Depth Capacity
Probably the most significant contribution to the success of slim-hole drilling has been the use of drill tubing or thin-walled drill pipe. In addition to reducing the weight of the drill string, the use of drill tubing has resulted in a more efficient hydraulic system in drilling slim holes.
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