Multi-Rate Multi-Zone Production Logging and Testing to Monitor Waterflood Performance and Provide Real-Time Reservoir Insight for Stimulation Treatment Optimization in Deepwater GOM
Dr. Mehdi Azari
Halliburton
Proper producing-well characterization is necessary for asset management. Whether the reservoir has partial aquifer influx or is waterflooded, the flow profile of produced/injected water and the reservoir pressure, permeability, fluid saturations, and formation compaction are useful to evaluate the overall sweep efficiency properly. This information is more crucial in a field with multilayered reservoirs having different permeabilities, pressures, and structures. Multirate/multizone (MRMZ) production logging and pressure-transient testing help obtain the necessary information.
Many of the Gulf of Mexico Mars Field wells produce from multiple reservoir layers, making MRMZ surveys valuable methods to estimate the layer flow rates, pressures, permeabilities, skin factors, crossflow, and the distance to and type of boundaries. A surveillance logging program has been conducted since 2004, with initial baseline surveys to monitor and optimize production performance and to track waterflood progress. This approach allows reservoir characterization without requiring zonal isolation. It also helps to evaluate where the waterflood has influenced pressure maintenance. Monitoring the waterflood with cased-hole logs is critical to improving the performance and increasing the overall recovery. Conformance treatment can be performed to mitigate excessive water production after identifying the source and the location of the problem.
This paper discusses best practices during job design and performance, as well as the interpretation of production logging and associated pressure transient analysis in Mars Field and in a few other wells in Deep water Gulf of Mexico. In a recent MRMZ job, an 8- fold increase in the productivity of the well was observed with acid stimulation treatment after MRMZ identified in realtime that the high skin around the wellbore was the cause of the production decline.
Biographical Sketch of Mehdi Azari
Mehdi Azari is a Senior Technical Advisor working for Halliburton for the past 28 years. Currently, he is the Reservoir Engineering Advisor in the Reservoir Solution Center of Wireline and Perforating product line in Houston.
He Previously worked for the Halliburton Consulting for 6 years in Algeria, Saudi Arabia, and Kuwait in Production Optimization and in Unconventional tight-gas recovery; Cased-Hole Solution in Houston; Reservoir Information, Tools-Testing-TCP, and Reservoir Services in Dallas; worked at Halliburton Production Enhancement Services in Duncan, Oklahoma; was a professor of Petroleum Engineering at the University of Wyoming; and worked at OSCO computer center in Abadan.
He holds a BS degree in Chemical Engineering from Abadan Institute of Technology, MS and PhD degrees in Petroleum Engineering from University of Southern California, and is a registered Professional Engineer.
Dr. Azari was the chairman of the Reservoir Mechanics Technical Interest Group (TIG) of the Society of Petroleum Engineers (SPE). He was also a Technical Editor for Formation Evaluation Journal and the Program Chairman for several SPE meeting sessions. He has served in the Reservoir Engineering, the Emerging/Peripheral Technology, the Pressure Transient Testing, and the Gas Reservoir Engineering Programming Committees of SPE. He was the Program Chairman for the Reservoir Session of the International Petroleum Technology Conference(IPTC) and was the first Senior Member of the Technical Staff with Halliburton Reservoir Services. He was nominated for the five Best Mechanical Engineering Award of ASME at the OTC in Houston, May 5, 2004 and received the E & P Hart’s Meritorious Award for Engineering Innovation at the OTC Conference and Exhibition, May 2, 2005.
Dr. Azari has authored over 85 publications in reservoir engineering, well testing, wireline formation tester, perforation, production engineering, reservoir simulation, formation damage, and geopressured reservoirs. He also has 14 US and international patents. He has made numerous technical presentations, seminars, short courses, SPE luncheon and dinner talks in United States, South America, Middle East, Africa, and SE Asia.
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