Session 2 
Thursday, November 4th 
8:30am – 9:30am US Central Time

Presentation 1: 
The Advent of Logging-While-Drilling Downhole Fluid Analysis: Case Studies from South East Asia.
Aldrick Garcia Mayans, Schlumberger

Downhole fluid analysis (DFA) has proved to be an effective technology for assisting in understanding reservoir dynamics, fluid distribution, reservoir compartmentalization and in-reservoir processes. Until recently, DFA technology was only available with wireline-conveyed tools. It was typically performed after the well had been drilled, limiting the ability for real-time decision making. The recent advent of logging-while-drilling (LWD) DFA technology — also known as fluid mapping-while-drilling (FMWD) — allows operators to make informed and timely decisions early on well construction, landing, geosteering and completion without pulling out of hole. This paper presents the results of an FMWD campaign by Repsol in Malaysia.

FMWD technology was deployed in five wells with different objectives but with the common goal of enabling real-time decision making prior to the bottomhole assembly (BHA) reaching the surface. The FMWD objectives were to assess reservoir connectivity, monitor pressure depletion, measure CO2 content, and differentiate between formation fluids (gas, oil, and water). For exploratory targets, the service was run to confirm the presence of hydrocarbons and to assess in-situ fluid properties. In a highly deviated well, the technology was used to confirm fluid properties for geosteering the wellbore through a targeted zone if it proved to be oil bearing.

The campaign was very successful, and the objectives were fully achieved. With the completion of more than 130 pressure tests, a comprehensive and complete pressure profile was obtained in each of the five wells, allowing for the selection of the most appropriate depths for DFA fluid scanning and sampling. Twenty-four DFA stations enabled clearly identifying fluid types in various exploratory and appraisal targets. This information was then used to make key decisions on well landing and completion strategy. In addition, CO2 was systematically identified and quantified by the tool optical spectrometers; thereby, accurately mapping its distribution across the field. Real-time data transmission using mud pulse telemetry allowed for real-time monitoring and important operational decision making.  In some cases, only 15 minutes of pumpout was sufficient time to identify the movable reservoir fluid phase. In other cases, physical downhole fluid samples were collected once the mud filtrate contamination had sufficiently decreased below the predefined acceptable limit. In general, the time on each station was brief, which was attributed to reduced depth of filtrate invasion because FMWD operations took place soon after drilling.

This paper presents the lessons learned from introducing of the FMWD service in exploration, reservoir management and geosteering, within the same five-well drilling campaign. Until the present time, this technology was only available using wireline. However, the introduction of LWD DFA has been found to be disruptive for reservoir management, drilling, completion, and geosteering applications, similar to the way formation pressure-while-drilling (FPWD) was a gamer changer for the drilling industry when introduced in early 2000s.

Speaker: Aldrick Garcia Mayans  is a Principal Reservoir Engineer and Asia LWD Reservoir Domain Champion located in Jakarta, Indonesia. Prior joining Schlumberger in 2004 as a field engineer, he earned a MSc in Mechanical engineering from École Nationale d’Arts & Métiers, France and a MSc in Petroleum Engineering from the French Petroleum Institute, France. In Schlumberger, he has been working closely with LWD reservoir services holding various field, technical, and interpretation positions in Congo, Angola, United States and Indonesia. Prior to his present position Aldrick was North America LWD Reservoir Domain Champion. He authored and co-authored several industry papers and patents related to formation pressure, formation sampling and annular pressure while drilling services and applications. He is a member of the SPWLA and SPE.

Presentation 2: 

Areal connectivity assessment of a heavily compartmentalized reservoir through downhole fluid analysis and data integration.
Tarek Mohamed, The University of Texas at Austin

Connectivity assessment is vital to the development of deepwater reservoirs where inaccurate characterization often results in production underperformance. Connectivity realizations are needed for production forecast, completion and production plans, and water flooding plans, to name a few. Seismic surveys are not always sufficient to evaluate lateral connectivity as detected faults might be transmissive or partially transmissive. Additionally, the presence of sub-seismic sealing faults is a constant possibility. Vertical connectivity represents another uncertainty where, in many cases, pressure measurements and conventional well-logs are unable to predict the presence of baffles and barriers along oil columns. In moderately complex reservoirs, downhole fluid analysis (DFA) workflow proved to be sufficient in addressing reservoir connectivity. However, heavily faulted reservoirs necessitate a comprehensive approach to address their excessive complexity. This study presents a novel workflow to evaluate the connectivity of heavily compartmentalized reservoirs. We implemented our workflow to characterize the connectivity of an exceedingly complex deepwater reservoir. As a result of our study, we were able to classify detectable faults as sealing, transmissive, or partially transmissive faults.  The presence of sub-seismic faults was also detected.

Tarek Mohamed  is a graduate student and petrophysics research assistant at the University of Texas at Austin, pursuing a PhD degree in petroleum engineering under the supervision of Dr. Carlos Torres-Verdin. His research focuses on developing new interpretation methods and applications of formation testers and downhole fluid analysis (DFA) measurements. He holds a BS degree from Suez University, Egypt, and an MS degree from the University of Oklahoma in petroleum engineering, and a Graduate Certificate in data science and analytics from the University of Oklahoma. His wide educational background includes petrophysics, formation evaluation, reservoir characterization, reservoir numerical modeling and simulation, well test analysis, reservoir geomechanics, and data science and machine learning. He also has a variety of professional, teaching assistance, and research experiences


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