Determinación del Modelo de Saturación de Agua Inicial basado en Curvas de Presión Capilar por Tipo de Roca:

Eddymar del Valle Márquez Codina; César Eustoquio Aguilar Silva; Américo Enrique  Perozo Lloris

doi:10.22209/rt.v44n3a01

Eddymar Márquez1 PDVSA-Estudios Integrados de Yacimientos Occidente, Maracaibo 4002. https://orcid.org/0000-0003-4670-9827
César Aguilar PDVSA-Estudios Integrados de Yacimientos Occidente, Maracaibo, Venezuela.
Américo Perozo Universidad del Zulia, Maracaibo, Venezuela.

DOI: https://doi.org/10.22209/rt.v44n3a01

Keywords: capillary pressure, initial water saturation, model; rock type, stock-tank original oil in place

Abstract

The log-derived initial water saturation (S_wi) is influenced by fluids drainage from the producing wells, generating underestimation of the Stock-Tank Original Oil in Place (STOOIP). To restore the initial conditions of the reservoir, it is necessary to use drainage Capillary Pressure (P_c) tests, which determine the distribution of S_wi, prior to any hydrocarbon production. This research aimed to determine the S_wi model, based on P_c curves by rock type, for a better estimation of the STOOIP of LUZ reservoir in the Maracaibo Basin. The methodological procedure included: data gathering (logs and cores, with 15 plug samples for P_c analysis), description of rock types, determination of the S_wi model and estimation of the STOOIP. Among the results, the following stand out: the J-Leverett model fit best to the P_c curves of the reservoir for all rock types; the estimated STOOIP using the water saturation (S_w) of the proposed capillary pressure based model and the one estimated using logs, showed a discrepancy of 19.8 %, evidencing the importance of a robust model to increase certainty in the estimation of reserves.

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Author Biographies

Eddymar Márquez1 , PDVSA-Estudios Integrados de Yacimientos Occidente, Maracaibo 4002.

Petroleum Engineer, graduated from the University of Zulia, Maracaibo, Venezuela (2013). He completed a Diploma in Management of Integrated Reservoir Studies at the Dr. Rafael Belloso Chacín University, Maracaibo, Venezuela (2016). She obtained a Master's Degree in Petroleum Engineering at the University of Zulia, (2020). She worked as a Support Engineer in the discipline of Petrophysics at the Petrociencia Foundation (2016), participating in the Data Model of the Integrated Studies Project of the Lagunillas Inf-07 deposit in the PDVSA company. In 2017, he joined PDVSA as a Petrophysicist (in training); He belonged to the Drainage Points team, supporting the Lagunillas Lago Production Unit, and exercising various activities, such as: collaboration in multidisciplinary teams for the generation of new locations, follow-up and monitoring in the construction of the wells, as well as the petrophysical evaluation of the new wells drilled. Currently, he is working on the petrophysical characterization of a siliciclastic deposit of the Maracaibo Basin, among the responsibilities exercised are: Analysis of Registers and Nuclei, collaboration in the Permeability Model, defining the types of rock, as well as in the Saturation Model of Initial Water for the calculation of the Original Oil in Place (POES).

César Aguilar, PDVSA-Estudios Integrados de Yacimientos Occidente, Maracaibo, Venezuela.

Petroleum Engineer, graduated from the University of Zulia, Maracaibo, Venezuela (2002). He was part of the program "Integration of Reservoir Studies", taught by Beicip Franlab, Caracas, Venezuela (2006-2007). He studied Petroleum at the French Institute of Petroleum, Paris, France (2009). With 16 years of experience in the Petrophysical Characterization of Reservoirs, with a positive record of Static Reservoir Models to minimize the existing uncertainty in reserves. Professional with solid knowledge of Core Analysis, Bare Hole and Cased Well Logs, Geology, Physics, Emerging Characterization Methodologies, Multivariate Statistics. He has been working at PDVSA since 2005; Its activities include: Petrophysical Characterization of naturally fractured tight carbonate and siliclastic reservoirs of the Maracaibo Basin, participating in about 6 semi-regional studies; identification of opportunities to increase production; reduction of production of unwanted fluids; strategic support to enhanced recovery activities. Author of 11 technical publications, using current petrophysical characterization tools and techniques. He mentors young professionals and students, as well as collaborative work with Petroleum magazine and the oilchanneltv portal. Member of the Society of Petroleum Engineers (SPE) and the Society of Petrophysicists and Well Log Analysts (SPWLA).

Américo Perozo, Universidad del Zulia, Maracaibo, Venezuela.

Petroleum Engineer, LUZ, Maracaibo, Venezuela (1966), Master in Petroleum Engineering, LUZ, (1971). With 53 years of diversified experience. He joined LUZ since 1973 as a professor at the School of Petroleum Engineering (undergraduate and graduate), currently being a professor at the Postgraduate Division in the Petroleum Engineering and Petroleum Geology programs, teaching the chairs of: Formation Evaluation, Well Completion and Reconditioning, Well Damage and Stimulation, Reservoir Physics, Geological Characterization of Reservoirs, Integrated Reservoir Management, Electric Profiling. He has also been the tutor of a considerable number of Special Degree Projects and Degree Projects. In the hydrocarbon industry, he worked in the Venezuelan Petroleum Corporation (CVP) practicing in areas such as: Drilling, Petrophysics, Production and Reservoirs. He was Senior Exploration Engineer at MENEVEN, S.A. He worked as Secondary Recovery Coordinator at CORPOVEN, S.A. He worked as Superintendent of Light Crude Oil Fields at MARAVEN, S.A. He was Instructor of PDVSA - CIED (Reservoirs, Production and Petrophysics), Integral Manager of Reservoirs at OLEOLUZ. He has been a leading advisor in Integrated Reservoir Studies, Geosciences, Drilling and RA / RC, in CSC Consultants, PDVSA, Conoco Phillips, Repsol, Petrociencia, among other companies.

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Determination of the Initial Water Saturation Model based on Capillary Pressure Curves by Rock Type

Determination of the Initial Water Saturation Model based on Capillary Pressure Curves by Rock Type

Abstract

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References