This paper describes the factors contributing to excessive torque and drag that necessitated the use of sub-based mechanical friction-reduction tools in one land and two offshore wells. The software modeling of torque and drag is presented with the predicted and actual results. The paper also describes how the friction-reduction tools were run and how they work.
Applications related to this paper include any well with torque or drag challenges limiting the reach of a well or the options available for completions operations, extended-reach wells (ERWs), and any drilling, fishing, or other operation restricted by torque or drag challenges.
Effective planning and running of specialized tools are required for success. All three wells discussed had higher than expected torque and drag forces. The first and second wells experienced excessive torque, which threatened to halt drilling before reaching total depth (TD). In both cases the torque was reduced significantly, enabling drilling to continue to the target depths. In the third well, drag was reduced sufficiently to take advantage of an otherwise unavailable well-completion method, resulting in increased production and earlier financial recovery of drilling and completion costs.
This paper helps familiarize the reader with the technology and function of sub-based, rolling mechanical, friction-reduction tools, techniques, and information required to run a torque and drag model, as well as the benefits of using roller tools in drilling and completions operations.