Building, Testing and Qualifying New Hook Load Rig
To meet the growing demand for energy, the petroleum industry is looking in places previously thought to be unreachable. The continued search is causing the oil and gas industry to drill more advanced wells than ever. With the increased challenges of drilling, non-productive time (NPT) is a rising concern for the industry. During drilling, NPT annually amounts to as much as 35% of the costs of the operation. Therefore, identifying and understanding variations in the drilling parameters during drilling operations is important. Recognizing well signals and signatures will enable early problem detection, thereby reduce NPT, and enhance safety.
This thesis concentrates on initial investigations into hook load variations during tripping out of hole and thereafter make a laboratory model for hook load simulation. This in order to contribute to the understanding of the signals given by variations in hook load values. A hook load rig is developed based on the theory presented and previous hook load models built at NTNU. The apparatus consisted of elements representing the drilling rig hoisting system, low-pressure mud circulation system, the drillstring including bottom hole assembly, the borehole and relevant controls and instrumentation.
Detailed procedures for use of the hook load rig are established and presented. A program to monitor and control the experiments was made in LabVIEW. The model encompasses large pulling force capacity and safety features to safeguard its operation, as well as flexibility with respect to key parameter variations. Several experiments have been performed in the laboratory order to qualify the rig. Tests with restrictions and without restrictions were conducted in order to identify hook load signatures. Issues, such as frequency disturbances were investigated and largely resolved.
The results presented in this thesis have identified curves resembling real-time drilling data for normal hook load, cuttings accumulation, and for moving past an obstacle by laboratory simulations. In its current state, the hook load rig provides for a solid foundation for further testing and experiments.
Place, publisher, year, edition, pages
Institutt for petroleumsteknologi og anvendt geofysikk , 2014. , 104 p.
IdentifiersURN: urn:nbn:no:ntnu:diva-25550Local ID: ntnudaim:12032OAI: oai:DiVA.org:ntnu-25550DiVA: diva2:736512
Skalle, Pål, Førsteamanuensis