Integration of geological and well log and geomechanical modeling toward a safe mud weight for wellbore stability: A case study of Ruby field, Blocks 01&02, Cuu Long basin
Abstract
There is a high density of drilled wells in Blocks 01&02 which is a part of the Cuu Long basin. The geological settings of this area have undergone a complicated evolution, resulting in heterogeneous lithology and variable stresses. Consequently, drilling activities in the Ruby oil field have faced numerous challenges, such as stuck pipe, gas kick, mud loss, and even lost well, etc. leading to substantial time and financial setbacks. It is essential to thoroughly understand the geomechanical characteristics of Ruby field to ensure safe operation and optimize drilling. In this paper, several downhole geophysical data sets such as wireline logging data as gamma ray (GR), density log (RHOB), neutron (NPHI), compression/shear sonic travel time (DTC/DTS), image formation log (FMI), pressure test (MDT) and leak of test (LOT, XLOT) are used to construct the 1D geomechanical model. The objective of this modelling is to compute parameters of pore pressure, vertical stress, horizontal stress, elastics properties, rock strengths. Then, these parameters are used to analyze the wellbore stability and to recommend appropriate drilling mud weights for the wells under study. This analysis can subsequently be extended to cover the entire Ruby oil field for the future drilling operations to enhance overall safety and efficiency.
References
Nguyen Van Dac, "Chapter 3: Overview of petroleum resources of Vietnam", In: The Petroleum Geology and Resources of Vietnam. Science and Technics Publishing House, 2005.
Le Van Cu, Hoang Ngoc Dang, and Tran Van Tri, "Chapter 5: Tertiary sedimentary basins in Vietnam". In: The Petroleum Geology and Resources of Vietnam. Science and Technics Publishing House, 2005.
Richard Plumb, Stephen Edwards, Gary Pidcock, Donald Lee, Brian StaceyThe mechanical earth model concept and its application to high-risk well construction projects", IADC/SPE Drilling Conference, New Orleans, Louisiana, 23 - 25 February 2000. DOI: 10.2118/59128-MS.
Ayoub Darvishpour, Masoud Cheraghi Seifabad, David Anthony Wood, and Hamzeh Ghorbani, "Wellbore stability analysis to determine the safe mud weight window for sandstone layers", Petroleum Exploration and Development, Vol. 46, No. 5, pp. 1031 - 1038, 2019. DOI: 10.1016/S1876-3804(19)60260-0.
Daniel Moos, Pavel Peska, Thomas Finkbeiner, and Mark Zoback, "Comprehensive wellbore stability analysis utilizing", Journal of Petroleum Science and Engineering, Volume 38, Issues 3 - 4, pp. 97 - 109, 2003. DOI: 10.1016/S0920-4105(03)00024-X.
M.S. Asadi, A. Khaksar, M.J. Ring, and K. Yin Yin, "Comprehensive geomechanical modeling and wellbore stability analysis for infill drilling of high-angled wells in a mature oil field", SPE Asia Pacific Oil & Gas Conference and Exhibition, Perth, Australia, 25 - 27 October 2016. DOI: 10.2118/182220-MS.
William J. Schmidt, Bui Huy Hoang, James W. Handschy, Vu Trong Hai, Trinh Xuan Cuong, and Nguyen Thanh Tung, "Tectonic evolution and regional setting of the Cuu Long basin, Vietnam", Tectonophysics, Volume 757, pp. 36 - 57, 2019. DOI: 10.1016/j.tecto.2019.03.001.
Tran Le Dong and Phung Dac Hai, "Chapter 9: Cuu Long sedimentary basin and petroleum resources", In: The Petroleum Geology and Resources of Vietnam. Science and Technics Publishing House, 2005.
Michael B.W. Fyhn, Lars O. Boldreel, and Lars H. Nielsen, "Geological development of the Central and South Vietnamese margin: Implications for the establishment of the East Sea, Indochinese escape tectonics and Cenozoic volcanism", Tectonophysics, Volume 478, Issues 3 - 4, pp. 184 -214, 2009. DOI: 10.1016/j.tecto.2009.08.002.
Trinh Xuan Cuong and J. K. Warren, "Bach Ho field, a fractured granitic basement reservoir, Cuu Long basin, offshore SE Vietnam: A “buried-hill” play", Journal of Petroleum Geology, Volume 32, Issue 2, pp. 129 - 156, 2009. DOI: 10.1111/j.1747-5457.2009.00440.x.
Muhammad Zain-Ul-Abedin and Andreas Henk, "Building 1D and 3D mechanical earth models for underground gas storage - A case study from the Molasse basin, Southern Germany", Energies, Volume 13, Issue 21, 2000. DOI: 10.3390/en13215722.
M. Zoback, "Part I: Basic principles", In: Reservoir Geomechanics. Cambridge University Press, 2007. DOI: 10.1017/CBO9780511586477.
Milendra Prankada, Kriti Yadav, and Anirbid Sircar, "Analysis of wellbore stability by pore pressure prediction using seismic velocity", Energy Geoscience, Volume 2, Issue 4, pp. 219 - 228, 2021. DOI: 10.1016/j.engeos.2021.06.005.
Nguyen Van Hoang, Pham Quy Ngoc, Nguyen Minh Quy, and Doan Huy Hien, "Pre-drill pore pressure prediction using seismic interval velocity and wireline log: Case studies for some wells in Cuu Long and Song Hong basins", Petrovietnam Journal, Volume 8, pp. 5 - 12, 2022. DOI: 10.47800/PVJ.2022.08-01.
Mohammed S. Ameen, Brian G.D. Smart, J.Mc. Somerville, Sally Hammilton, and Nassir A. Naji, "Predicting rock mechanical properties of carbonates from wireline logs (A case study: Arab-D reservoir, Ghawar field, Saudi Arabia", Marine and Petroleum Geology, Volume 26, Issue 4, pp. 430 - 444, 2009. DOI: 10.1016/j.marpetgeo.2009.01.017.
Schlumberger, "Schlumberger techlog software solution", 2021.
Chandong Chang, Mark D. Zoback, and Abbas Khaksarb, "Empirical relations between rock strength and physical properties in sedimentary rocks", Journal of Petroleum Science and Engineering, Volume 51, Issues 3 - 4, pp. 223 - 237, 2006. DOI: 10.1016/j.petrol.2006.01.003.
Per Horsrud, "Estimating mechanical properties of shale from empirical correlations. SPE Drilling & Completion, Volume 16, Issue 2, pp. 68 - 73, 2001. DOI: 10.2118/56017-PA
Saeed Shad, Parvin Kolahkaj, and Davood Zivar, "Geomechanical analysis of an oil field: Numerical study of wellbore stability and reservoir subsidence", Petroleum Research, Volume 8, Issue 3, pp. 350 - 359, 2023. DOI: 10.1016/j.ptlrs.2022.08.002.
Ramli Nazir, Ehsan Momeni, Danial Jahed Armaghani, and Mohd For Mohd Amin, "Correlation between unconfined compressive strength and indirect tensile strength of limestone rock samples electronic", Journal of Geotechnical Engineering, Volume 18, pp. 1737- 1746, 2013.
Mark D. Zoback, "Part II: Measuring stress orientation and magnitude", In: Reservoir Geomechanics. Cambrigde University Press, 2007. DOI: 10.1017/CBO9780511586477.
M. Brudya M.D. Zoback, "Drilling-induced tensile wall-fractures: implications for determination of in-situ stress orientation and magnitude", International Journal of Rock Mechanics and Mining Sciences, Volume 36, Issue 2, pp. 191 - 215, 1999. DOI: 10.1016/S0148-9062(98)00182-X.
1. The Author assigns all copyright in and to the article (the Work) to the Petrovietnam Journal, including the right to publish, republish, transmit, sell and distribute the Work in whole or in part in electronic and print editions of the Journal, in all media of expression now known or later developed.
2. By this assignment of copyright to the Petrovietnam Journal, reproduction, posting, transmission, distribution or other use of the Work in whole or in part in any medium by the Author requires a full citation to the Journal, suitable in form and content as follows: title of article, authors’ names, journal title, volume, issue, year, copyright owner as specified in the Journal, DOI number. Links to the final article published on the website of the Journal are encouraged.
