SPE Online Education
Live Characterization of Asphaltene Precipitation: Bridging Flow Assurance and Formation Evaluation
Includes a Live Event on 06/30/2022 at 1:00 PM (EDT)
Flow assurance is a vital challenge that affects the viability of an asset in all oil producing environments. A proper understanding of asphaltene precipitation leading to deposition lends itself to reliable completions planning and timely remediation efforts. This ultimately dictates the production life of the reservoir.
The Wireline Formation Tester (WFT) has traditionally aided the understanding of asphaltene composition in reservoir fluids through the collection of pressurized fluid samples. Moreover,the use of Downhole Fluid Analysis (DFA) during a fluid pumpout has augmented the understanding of soluble asphaltenes under in-situ flowing conditions. However, an accurate and representative measurement of Asphaltene Onset Pressure (AOP) has eluded the industry. Traditionally, this measurement has been determined post-acquisition through different laboratory techniques performed on a restored fluid sample. Although sound, there are inherent challenges that affect the quality of the results. These challenges primarily include the need to restore samples to reservoir conditions, maintaining samples at equilibrium composition, and the destruction of fluid samples through inadvertent asphaltene precipitation during transporting and handling. Hence, there is aneed for WFT operations to deliver a source of reliable analysis, particularly in high-pressure/high-temperature (HP/HT) reservoirs, to avoid costly miscalculations.
A premiere industry method to determine AOP under in-situ producible conditions is presented. Demonstrated in a Gulf of Mexico (GOM) reservoir, this novel technique mimics the gravimetric and light scattering methods, where a fluid sample is isothermally depressurized from initial reservoir pressure; simultaneously, DFA monitors asphaltene precipitation from solution and a high-precision pressure gauge records the onset of asphaltene precipitation. This measurement is provided continuously and in real time. An added advantage is that experiments are performed individually after obtaining a pressurized sample in distinct oil zones. Therefore, the execution of this downhole AOP experiment is independent of an already captured fluid sample and does not impact the quality of any later laboratory-based analysis. Once the measurements are obtained,these can be utilized in flow assurance modeling methods to describe asphaltene precipitation kinetics, and continuity of complex reservoirs. For the first time in literature, this study applies these modeling methods in combination with the AOP data acquired from a downhole WFT.
This approach has the potential to create a step change in reservoir analysis by providing AOP at the sand-face, along with insight that describe performance from asphaltene precipitation. The results of which have tremendous economic implications on production planning.
This webinar is categorized under the Projects, Facilities, and Construction technical discipline.
All content contained within this webinar is copyrighted by Rohin Naveena-Chandran and its use and/or reproduction outside the portal requires express permission from Rohin Naveena-Chandran.
Rohin Naveena-Chandran is a GOM Wireline & Perforating Business Development Manager for Halliburton. With experience spanning 18 years globally, he has supported operators in field operations and as a Technical Advisor. Over the past 13 years, he has worked within the GOM and has contributed to several innovative formation testing and sampling projects that have provided value to the industry. Rohin obtained a bachelor’s degree in Electrical Engineering from the University of Victoria and a master’s degreee in Electrical Engineering from the University of Waterloo.
Nikhil Joshi (Moderator)
Nikhil Joshi is the Director of Innovation and Technology at Talos Energy. In his current role, Nikhil is focused on energy transition and use of current O&G skillsets to be applied towards carbon capture and sequestration, hydrogen, geothermal and wind power generation, among others. He has written over 50 technical papers and presented at several events and enjoys bringing non-conventional technical and commercial solutions to non-trivial challenges.
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