Project Profile
Value: 25million
Location: Northwest Flank, 135km offshore Sabah, Malaysia
Reserves:
Start-up Year: 1979
St. Joseph is a mature oil field located 135km offshore Sabah, Malaysia. The oil initially in place (STOIIP) is estimated at 630 MMstb, of which 83% is located in the main reservoir package in the Northwest Flank. These reservoir units dip at an angle of approximately 20 degrees to the NW and have a strongly layered internal architecture, with only limited (vertical) communication between layers. Sand porosities and permeabilities are good in the oil column, generally deteriorating down flank into an aquifer.
The St. Joseph field has been on production since 1981. Until 1996 the recovery mechanism was natural depletion under gravity drainage. At the end of 1995, the field had produced 105 MMstb out of the total ultimate recovery estimated at 230 MMstb. Average pressure had fallen from 7.3 MPa to 4.1 MPa. Since May 1996, production has been supported by crestal gas injection. Gas is injected into the reservoir for two reasons: disposal of produced gas from St. Joseph and neighbouring fields and reservoir pressure maintenance. St. Joseph field is located in the North Sabah PSC and is Shell-operated with Shell and Petronas Carigali Sdn. Bhd each holding a 50% equity interest.
A feasibility study completed in the second quarter of 2006 concluded that water injection was not only feasible, but also required to safeguard developed reserves and to realize additional oil recovery from the field. A large redevelopment project is planned to facilitate water flooding. The total scope of the project includes the installation of a new platform for offshore living quarters, seawater treatment and injection facilities, and the drilling of six horizontal water injectors and five infill producer wells. Treated seawater will be used as injection fluid at a total rate of 10,000 bbl/d for each injection well. First water was injected in 2010, however at the time this study was conducted start of injection was expected to be in October 2009.
Due to the low oil price,Shell considered to sell the field in 2015. Hibiscus and Shell got the deal that Hibiscus got the North Sabah PSC(inclouding St joseph,SF 30,South Furious,Barton) for 25milion.Hibiscus became the operator of the field in March 2018
Operators:
Hibiscus: Operator with 50% interest
Petronas Carigali Sdn. Bhd.: 50% interest
Contractor:
Technip: Conceptual study