Formation Evaluation Society of Malaysia (FESM)

Formation Evaluation Society of Malaysia (FESM)

Heavy Oil Unconsolidated Core - the Challenges of Laboratory Testing

Correctly controlled core analysis can be an excellent resource for determining many of the dynamic and static reservoir and rock-fluid properties required as inputs to dynamic reservoir models.  Coreflood experiments can be designed to investigate a wide range of fluids and chemicals that might be considered for injection, under full reservoir conditions.  Also, designed experiments can investigate the diverse challenges associated with reservoir management; from potential formation damage, wellbore stability, injection/production issues, sand management, through to the microscopic sweep efficiency of planned drive mechanisms.

  However, as indicated in the book, “Core Analysis: A Best Practice Guide”, several issues with experimental and analytical processes can introduce uncertainty and create poor quality data. These issues can be exacerbated by challenging materials: either challenging fluids, such as heavy oils or certain gases; or challenging environments, such as cavernous carbonates, heterolithic and interbedded reservoirs, fractured systems or unconsolidated sands. This presentation will illustrate the particular challenges associated with handling and testing unconsolidated sands and heavy oils, and will consider the process and experimental designs necessary to exceed these challenges.

Bio data: 

Jules Reed has over 25 years’ experience in core analysis and is co-author of the book, “Core Analysis: A Best Practice Guide”; volume 64 in Elsevier’s Developments in Petroleum Science. Jules is a Past President of the Society of Core Analysts (SCA) and currently serves on the board as Director – North & East Europe. His experience has been gained working for Core Laboratories, Corex and as Chief Engineer for ResLab (Weatherford Laboratories). He has a wide knowledge across most aspects of core analysis; from coring & core handling through petrophysical properties and into the promised land of advanced dynamic reservoir studies.  His main areas of focus have been on pragmatic data interpretation and implementation of wettability, capillary pressure and dynamic reservoir properties, including; relative permeability and laboratory feasibility studies for EOR (particularly solvent and chemical injection and low salinity waterflooding).

Application of Acoustic Noise and Temperature Logs in Idle Well Restoration and Qualitative Assessment of Reservoir Performance

Field A is a mature Malaysia basin field, located offshore east cost of Peninsula Malaysia. Most wells in Field A are complex, high angle and dual string completions with selectivity to access multiple reservoirs. Some wells are dual utility, where one string serves as a producer whilst the other string is an injector. Aging subsurface borehole equipment (e.g., tubing/connections, packers/seal assemblies, gas lift valves), corrosion, erosion from sand production, and temperature expansion/contraction from dual utility strings can result in leaks, which may require the well to be shut-in for further diagnostic.

This paper presents the application of the acoustic noise and temperature logs in idle well restorations in Field A and how the data is further utilized to qualitatively assess reservoir performance. Key logging strategies for successful leak detection and log interpretation analysis under complex borehole and reservoir environment settings are discussed. These strategies include designing a proper logging program under multiple borehole conditions whilst monitoring the surface tubing and casing pressures, optimizing the stationary acoustic noise data acquisition, and integrating the acoustic noise, temperature and pressure data to qualitatively analyse reservoir performance.

Bio Data :

Suzie Hamzah is currently working for EMEPMI as Senior Petrophysical Advisor.  She has 23 year of working experience in formation evaluation projects under exploration, development, infills and production environments; involving field studies, opgen, reservoir surveillance, WAG, subsurface well work intervention and completion integrity. Worked for ExxonMobil Exploration Company for 5 years.  One of ExxonMobil corporate experts in cased hole nuclear and production logging. Active instructor for ExxonMobil Cased Hole Production Logging and Formation Evaluation schools.