Proven Methods and Techniques to Reduce Torque and Drag in the PrePlanning and Drilling Execution of Oil and Gas Wells

Abstract

Abstract During the period of 2007 to 2009, the operator drilled several wells in the Gulf of Mexico (GOM), in which the predicted surface torque from the pre-well planning phase was higher than topdrive limitations and/or drillpipe specifications. This paper describes the torque and drag reduction methods that were found to be effective when fully applied over a series of wells. These methods were confirmed and proven through the analysis of field data and the use of torque and drag modeling software. This study is based on a case history of a 26,079-ft measured depth (MD), complex S-shaped well, but data from other deepwater GOM wells are presented as well to illustrate those proven techniques. Drilling engineers, application engineers and drilling supervisors can use this comprehensive collection of torque and drag reduction methods in the pre-well planning phase, as well as the drilling execution phase, to minimize risk. Applying these methods will ensure that critical and challenging wells can be successfully drilled to total depth as intended. The torque and drag reduction techniques discussed in this paper range from: Modeling drillstring and BHA modifications Optimizing well path design Using non-rotating drillpipe protectors Deploying mud additives Selecting and integrating a complete drilling systems approach These diverse techniques are proven through the use of data collected during the drilling process, and graphic representations that are discussed and explained in this paper.