Casing Setting Depth using Bottom-Up Method for Development Well in the Offshore

Agustinus Sua Azi

Agustinus Sua Azi Dili Institute of Technology

Keywords: Pore pressure, fracture gradient, mud density, casing setting depth, top-down method, bottom-up method, onshore, offshore, offset well, equivalent mud density

Abstract

Casing setting depth in drilling activities on onshore or offshore is an important aspect that must be planned. The selection of casing setting depths is based on the pore pressure and fracture pressure for the well and is usually available from offset well data. The method used in determining the casing depth is the top-down method and the bottom-up method. Generally, the top-down method is used in exploration drilling and the bottom-up method in development drilling. In certain cases, development drilling also uses the top-down method when complex formation conditions and abnormal pressure are encountered.Furak well is a development well with a depth of 442 ft of seawater and the distance from the rotary table to the seabed is 508 ft, including the category of deepwater wells. Based on the results of the pore-pressure and fracture gradient analysis and the determination of the casing setting depth using the bottom-up method, the results are obtained for the depth of each casing. Zero-point (0) to be calculated from the rotary table (RT). The depth of the conductor casing is 1010 ft with an equivalent mud weight of 8.5 ppg, the depth of the casing surface is 2495 ft with an equivalent mud density of 9.4 ppg, the depth of the intermediate casing is 6470 ft with an equivalent mud density of 10 ppg and a depth of production casing is 9810 ft with an equivalent mud density of 11.3 ppg.

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References

Aadnoy, B. S., Soteland, T., Rogeland, U., Ellingsen, B., (1989): Casing Point Selection at Shallow Depth, Drilling Conference, SPE/ IADC 18718, 825 – 836.

Adams, N. J., (1985): Drilling Engineering a Complete Well Planning Approach, Tulsa, Oklahoma: Penn Well Books.

Alliquander, O., (1974): Design Method of Setting Depth of Protecting Casing String in Hungary, SPE- European Spring Meeting, SPE-4832.

Anderson, R. A., Ingram, D. S., and Zanier, A. M., (1973): Determining Fracture Pressure Gradients from Well Logs, Journal of Petroleum Technology.

Bourgoyne, J., Adam, T., Millheim, K. K., Chenevert, M. E., Jr Young, F. S., (1986), Applied Drilling Engineering, Society of Petroleum Engineers, Richardson TX, United State of America.

Boniface, O. A., Marcus, N. M., (2015): A Model to Determine the Effect of Pore Pressure and Fracture Gradient on Stuck Pipe Management, Nigeria Annual International Conferences and Exhibition held in Lagos, SPE 178379 MS

BG, Group., (2001): Well Engineering and Production Operations Management System, Casing Design Manual, 30 – 35

Fertl, W. H., (1975): Abnormal Formation Presure, Implication to Exploration, Drilling and Production of Oil and Gas Resourch, Ponca City Oklohama.

Lage, A. C. F. M, Edson Y., Nakagawa., Rocha L. A. S., (1997): Description and Application of New Criteria for Casing Setting Depth, Offshore Techology Conference, OTC 8464.

Holasek, F. R., Singh, R. K., Shanker, S., (2006): Determination of 20 – in. Conductor Setting Depth in Deepwater Wells in the Krishna – Godavari Basin Offshore India, Drilling Technology Conference and Exhibition, SPE/IADC – 103667, 1 – 8.

Heriot–Watt., (2005): Drilling Engineering.

Kotow, K. J., and Pritchard, D. M., (2008): Exploting Shallow Formation Strengths to Deepen Riserless Casing Seat, SPE Annual Technical Conferences and Exhibition held in Dallas, SPE 191724 MS.

Li, S., Purdy, C., Wu, S., (2012): Pore Pressure and Fracture Gradient Prediction in Shale Gas Formation: Accounting for Complex Rock Properties an Anisotropies, IADC/SPE Asia Pasific Drilling Technology Conferences and Exhibition held in Tiajin, IADC/SPE 155540.

Marbun, B., Purba N. P., Fadholi, B. Z., (2015): An Integrated Management of Drilling Design and Operational of Geothermal Well, Proceedings World Geothermal Congress, 1 – 10.

Moore, P. L., (1986): Drilling Practices Manual, Second Edition, Penn well books, Tulsa Oklahoma USA.

Rabia, H., (2002): Well Engineering and Construction.

Santos, O., Adasani, I., Azar, J. J., Escorihuela, F., (1995): Determination of Casing Setting Depth Using Kick Tolerance Concept, Petroleum Computer Conferece, SPE – 30220

Schub, F. J., (1979): Conductor and Surface Casing Depth Requirement for Deep Water, Annual Fall Techology Conference and Exhibition, SPE-8316.

Syazwan, M., Shafei, A., Paimin, M. R., Su’if, M. Z., Abidin, H. Z., Ismail, Y., Natarajan, S., (2016) Enhancement of Structural Conductor Design and Execution of Jetting Operation for Ultra-Deepwater Wells in Brunei, Asia Pasific Oil and Gas Conference and Exibition, SPE – 182427 – MS, 1 – 17.

Zhang, J., and Yin, S.X., (2017) : Fracture Gradient Prediction: An Overview and Improved Method, Pet. Sci.

DOI 10.1007/s12182-017-0182-1