Analysis and Mitigation of High-Pressure and High-Temperature Well Completion Design of Elkin/Franklin Fields in the North Sea
Keywords:High pressure and high temperature wells, Completion design challenges, Completion design mitigation, Completion design analysis.
The development of High-Pressure and High-Temperature (HP/HT) wells is accompanied by high risk, and still represents one of the greatest technological challenges for the oil and gas industry related to the equipments used and their ability to sustain these conditions. The results analysis of data is key to investigating reasons for bad performances and failures of well completion design and detecting at an early stage potential downhole events.
This paper applies machine learning to the results of real data analysis of deep and deviated well in the HP/HT environment. It presents techniques used to analyze design limits for the tubing string of the well with different rates of production and water injection, and predict pressure and temperature when multiple operations are applied to the tubular string during the well's lifetime. It also analyzes the most important parameters that impact the tubular string, such as temperature effect, safety factors, and tubing length change. A simulation model for a well has been developed to accomplish the objective of this work by using WellcatTM software modules (Prod & Tube) based on real data from the Elgin/Franklin fields in the North Sea. Two designs of tubular string were used to analyze design limits; the first included a tubing size of 4 ½ in and a latched permanent packer, and the second was identical to the first one but included an expansion joint tool to allow free movement of the tubing, and it was used to mitigate the first well completion design failure. Based on the results of this paper, three load cases (produce-6 months, tubing leak, and water injection) failed in the first design when the rates of oil production and water injection were increased to 12000 bbl/d and 5000 bbl/d respectively, whilst all load cases fell into the triaxial envelope and met the axial criteria in the second design. Furthermore, the predicted results of pressure and temperature for the tubing and surroundings indicate the tubular string could be exposed to buckling problems and serious thermal expansion in the annulus. As well, tubing length can be changed (elongated or shortage) owing to thermal effects during multiple load cases.
Shadravan A. and Amani M. “HPHT 101-What Petroleum Engineers and Geoscientists Should Know About High Pressure High Temperature Wells Environment”. Energy Science and Technology Vol. 4, No. 2, pp. 36, 2012.Bergerot J. L., Total. Advanced Drilling in HP/HT: “Total’s Experience in Elgin/Franklin (UK North Sea)”. JPT • P. 116. October 2011.
Salguero A., Almanza E., and Harold Nivens, Halliburton Energy Services. “Well-Test Planning in Deep Water Wells in High-Pressure, High-Temperature Environments - The Brazil Experience”. Paper OTC 18734 presented at the 2007 Offshore Technology Conference held in Houston, Texas, U.S.A., 30 April–3 May 2007.
Krunal J., Texas A&M University, and John Lee, University of Houston. “Comparison of Various Deterministic Forecasting Techniques in Shale Gas Reservoirs”. Paper SPE-163870 presented at SPE Hydraulic Fracturing Technology Conference, Woodlands, Texas, USA, 4-6 February 2013.
Ahmad I., Akimov O., Bond P., Cairns P., Eide N., T. Gregg, Heimes T., Nwosu A., Wiese F.; Baker Hughes. “Reliable Technology for Drilling Operations in a High-Pressure/High-Temperature Environment”. Paper IADC/SPE 167972 presented at the IADC/SPE Drilling Conference and Exhibition held in Fort Worth, Texas, USA, 4–6 March 2014.
Thai P.; Rida E.; M. Al Ramadan; R. Ahmed and Catalin T., University of Oklahoma. "Well Integrity Issues: Extreme High-Pressure High-Temperature Wells and Geothermal Wells a Review". Paper SPE-198687 presented at the SPE Thermal Well Integrity and Design Symposium held in Banff, Alberta, Canada, 19-21 November 2019.
Satya M., Harish N. Patel, Alexander G., and Marcus C., ABS. “Challenges in Material Selection and its Qualification for use in HPHT Environment for Drilling Equipment”. Paper OTC-27266 prepared for presentation at the Offshore Technology Conference held in Houston, Texas, USA, 2–5 May 2016.
Izhar A., Oleg A., Paul B., Paul C., Thomas G., Thomas H., Greig R., Frank W., Baker Hughes. “Drilling Operations in HP/HT Environment”. Paper OTC-24829-MS presented at the Offshore Technology Conference Asia held in Kuala Lumpur, Malaysia, 25–28 March 2014.
Douglas J. and Scott D., Baker Hughes. “The High-Pressure / High –Temperature completion Landscape_ Yesterday, Today and Tomorrow”. Paper SPE 170919 presented at the spe Annual Technical Conference and Exhibition, Amsterdam. Paper peer approved 23 July 2015.
Selcuk D., Daniel R., and Nuri S., 2H Offshore. “HPHT Technology Verification, Validation, and Regulatory Requirements: HPHT Riser Technology Challenges”. Paper OTC-28624 prepared for presentation at the Offshore Technology Conference held in Houston, Texas, USA, 30 April–3 May 2018.
Bergerot J. L., Total. Advanced Drilling in HP/HT: “Total’s Experience in Elgin/Franklin (UK North Sea)”. JPT • P. 116. October 2011.
Mohammad A. & Oliver E., Total E&P UK Limited.” Improving Performance in Elgin HPHT Infill Drilling Despite Increasing Challenges”. Paper SPE-195725 prepared for presentation at the SPE Offshore Europe Conference and Exhibition held in Aberdeen, UK, 3-6 September 2019.
Halliburton, Landmark Software & Services. “The Value of Comprehensive Well Integrity Analysis in Deep- to Ultra deep water High-Pressure, High-Temperature Scenarios”. Retrieved August 14, 2021, from https://www.landmark-software.com/lists/documentrepository/2013-11-hpht-well-integrity-wellcat-white paper. pdf. (2013).
Fort J., Elf Exploration UK PLC. "The Elgin/Franklin Project: Developing the Largest High Pressure/High Temperature Fields in the World". Paper OTC 12117 presented at the Offshore Technology Conference held in Houston, Texas, 1–4 May 2000.
How to Cite
This work is licensed under a Creative Commons Attribution 4.0 International License.