Thursday, September 21st
8:00am – 9:00am US Central Time
Presentation 1: 08:00 AM
InSitu Fluid Characterization Through Formation Tester Flowline Decompression Experiments
Speaker: Mustafa Berkane
Abstract : Reservoir fluid properties are generally characterized through experiments conducted in laboratory set-up. Using the formation testing technology, a decompression experiment in the flow-line can be performed to mimic the laboratory constant composition expansion (CCE) experiments also known as phase separation test. In this talk, a real time data showing flowline decompression experiments are performed to characterize the reservoir fluid downhole in order to estimate the in-situ bubble point value.
The methodology used in this experiment consists of a super slow pump that creates the decompression process at fixed drawdown rate. The optical fluid analyzer is used to measure changes in real time to the optical density, C1 to C6+, CO2, GOR, viscosity and density as function of flowline depressurization. Some or all these measurements are acquired with different downhole formation tester after clean formation fluid is obtained. In this experiment, the fluid bubble initiation is detected using optical spectroscopy measurement with 64-ms data sampling rate. The viscosity and density measurements are also recorded as a function of pressure during decompression sequence where fluid compressibility is calculated.
In order to record a CCE experiment, a fixed volume of clean fluid is isolated within the flowline and decompressed at a super slow rate using the pump. During the decompression, the optical data is used to identify the first bubble liberation in the flowline causing optical density scattering. Other properties, such as GOR, Viscosity and density are also measured as a function of pressure decompression. The bubble point pressure identified from the optic scattering show consistent results with the laboratory PVT measurements. In one of the cases presented, the interrogated fluid GOR was extremely low, which create particular difficulties in bubble point nucleation, however, the final data still shows a good level of consistency between the downhole and laboratory CCE experiment. The real time data gathered was used to build an equation of state (EOS) model that can be utilized for quick decision making. Furthermore, the downhole bubble point determination helps to ensure the sampling optimization and avoid to drop the pressure below the multiphase process that often can create uncertainties large errors in the fluid characterization.
A unique In-Situ fluid characterization using downhole formation testing tool with advanced optical spectroscopy and pump to perform constant composition fluid expansion experiments.
Mustapha Berkane is a subject matter expert in Formation Testing and Sampling with Saudi Aramco focusing on wireline and LWD operations. Graduated as a Geophysicist from the Algerian Petroleum Institute in 1994 with 28 years of experience spanning between Schlumberger, Baker Hughes and Saudi Aramco. Starting in January 1995 as a wireline Field engineer in North Africa with the focus on remote location followed by several assignments in the UK, Norway and middle Est. The work experience covers several assignments in the field, management, technical support and sales before joining Saudi Aramco as senior Petrophysicist in 2014 before being assigned as the Formation Testing and sampling SME in 2018.
Presentation 2: 08:30 AM
Best Practices and Lessons Learnt from a Comparative Study of LWD Formation Pressure Measurement in Static and Circulating Wellbore Conditions in ERD Wells
Presenters: Alvaro Sainz
Abstract: This work shares the lessons learnt on the effects of wellbore conditions (static or dynamic) on the formation pressure data results, when using logging while drilling tools in extended reach drilling wells. This case study is for the data acquired in a carbonates field offshore Abu Dhabi. Based on those experiences some best practices are provided for the use of these tools on this kind of environments.
Alvaro Sainz is a Reservoir Engineer working for TotalEnergies, seconded in ADNOC. He has hold different reservoir management positions in operated assets along South America, North Africa and Middle East. He has over 16 years of experience in reservoir engineering and he still enjoys the integration of the information from multiple sources to solve specific reservoir challenges. He has a Master on Mining Engineering from “Universidad Politécnica de Madrid” and a Master on Petroleum Engineering from IFP in Paris.
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