Cruse Steamflood Expansion Case History
- V. Ramlal (Petrotrin)
- Document ID
- Society of Petroleum Engineers
- SPE Reservoir Evaluation & Engineering
- Publication Date
- December 2004
- Document Type
- Journal Paper
- 449 - 459
- 2004. Society of Petroleum Engineers
- 5.1.2 Faults and Fracture Characterisation, 2.4.3 Sand/Solids Control, 5.5 Reservoir Simulation, 5.7.2 Recovery Factors, 2.4.5 Gravel pack design & evaluation, 1.6 Drilling Operations, 2.2.2 Perforating, 4.6 Natural Gas, 5.3.2 Multiphase Flow, 7.1.10 Field Economic Analysis, 3 Production and Well Operations, 5.4.10 Microbial Methods, 5.8.5 Oil Sand, Oil Shale, Bitumen, 5.4.6 Thermal Methods, 5.6.9 Production Forecasting, 1.10.1 Drill string components and drilling tools (tubulars, jars, subs, stabilisers, reamers, etc), 5.5.8 History Matching, 5.2 Reservoir Fluid Dynamics, 7.1.9 Project Economic Analysis, 4.1.5 Processing Equipment
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SummaryThe Cruse "E" steamflood was designed and developed by Petrotrin from 1994 to 1996. This paper discusses the performance of the steamflood during steam injection and during a 4-year period of noninjection. It also covers the operational and economic aspects of the project and discusses the production response since restart, the amended forecast from history-matched reservoir simulation, and future operating strategies. Introduction The Cruse "E" (IADB) steamflood is located on the island of Trinidad (Fig. 1). It is situated in the southwestern region, in the Parrylands area, approximately 8 miles from the town of Point Fortin. It is one of seven active thermal projects developed and operated by Petrotrin and is the second most recent steamflood developed by the company. Some of the very mature steamfloods have been converted to heat-scavenging projects. Oil production from these thermal projects and heat-scavenging schemes account for 80% of enhanced-oil-recovery (EOR) production. The Cruse "E" expansion steamflood was undertaken following the success of the Cruse "E" pilot project. With loan financing from the Inter-American Development Bank (IADB), 28 new patterns were formed by drilling 60 wells and incorporating 35 existing wells in the thermal area (Fig. 2). Steam-generation and -distribution equipment and production facilities were installed in 1995. Actual steam injection began in January 1996. The shallow Cruse "E" sands were ideal for steamflooding and, as a result, a response was obtained in just 9 months. Twenty-two months later, production reached 1,200 BOPD. For environmental reasons, the flood was shut down in November 1998, and approval to restart was not obtained until March 2002. Actual injection of steam commenced in November 2002. The factors that will continue to contribute to the success of this project are:
- High reserves of shallow heavy oil at an average of 17°API.
- Reliable, adequate supplies of fresh water for injection and natural gas for steam generation.
- Good reservoir continuity with the project limits.
- Accumulated expertise gathered in the past 30 years in EOR from Petrotrin's predecessor companies.
- The success of the pilot project.
|File Size||5 MB||Number of Pages||11|