Sophisticated Software Analysis System and Use of Torque/Drag Modeling for Complex Well Operations Increases Operational Efficiency

Abstract

Accurate torque and drag (T&D) analysis is a fundamental well planning tool essential for predicting and preventing drilling and completion problems. To guarantee an efficient and safe operation, tension/compression and torque on the bottom hole assembly needs to be controlled within acceptable limits. Practically all available torque and drag software can calculate the following general operation modes: rotating off-bottom, pick-up, slack-off, rotary drilling and oriented drilling modes. However in the well construction process, there are many other complex operational modes that are largely absent from available software systems, as discussed in the literature. The industry requires modeling methodology to analyze complex well operations including: setting and un-setting packers, anchoring liner hangers, shearing pins in wellbore departure operations, loading and operating drilling/fishing jars in both overpull and compression. The authors will discuss new modeling software capable of analyzing complex well operations including liner hanger and jarring operations in detail. Further discourse about how modeling these special operations were combined with field experience and confirmed the accuracy of the new module with regards to both special operations and conventional T&D capabilities. The simulation/analysis recommendations were successfully executed in the field and led to increased operational efficiency and unplanned cost avoidance. Case studies will be presented of successful liner hanger deployment and complex drilling jar simulation.

Experimental study of friction coefficient of rocks in high pressure and tight gas reservoirs in Sichuan

“…It is important to correctly calculate the torque and drag of this kind of drilling. [1][2][3] According to oil and gas drilling process and the stiff-string model for calculating the torque and drag, 4 the force state of drill string is shown in Figure 1.…”