Source: Sefton Resources
Sefton Resources (AIM:SER) has commenced continuous steam flood operations at the Tapia heavy oil field near Castaic, California on the Hartje Lease in the central portion of the field.
Steam is being injected into the Hartje #10 well, which was formerly idle after it was converted to accept the steam injection process by the installation of a new slotted liner across the Yule oil reservoir at a depth of approximately 1,100 feet and which was achieved at a cost significantly lower than drilling a new injector.
The Hartie #10 well is surrounded by six other producing wells which the Directors believe will also benefit from the heat and pressure caused by the local steam injection.
Each well will be carefully monitored during the process and the data will be input into the steam flood simulation modelling. These refinements to the model, along with a newly developed geologic and reservoir model, will allow Sefton to identify the most efficient methods and injection patterns for the steam flood on a full field basis. Additionally, Sefton anticipates the benefit of increased oil production rates on the Hartje Lease and eastern portion of the adjacent Yule lease as a direct result of the steam injection.
"We have already proved that the steam process works very well in this area and have achieved very low lifting costs,” said Jim Ellerton, acting chairman and CEO of Sefton Resources. “This, coupled with the fact that we are profitable and have the continued support of our bank places us well for the future development of our other leases"
The Tapia heavy oil field is located in the East Ventura Basin of California. Steam injection is a common method of extracting heavy oil. It is considered an enhanced oil recovery (EOR) method and is the main type of thermal stimulation of heavy oil reservoirs. There are several different forms of the technology, with the two main ones being Cyclic Steam Stimulation and Continuous Steam Flooding. Both are most commonly applied to heavy oil reservoirs which are relatively shallow and which contain crude oils which are very viscous at the temperature of the native underground formation. Steam injection is widely used in the San Joaquin Valley of California (USA), the Lake Maracaibo area of Venezuela and the oil sands of northern Alberta (Canada).
This continuous steam injection pilot is part of an ongoing steam study being conducted by Dr. Farouq Ali P.Eng. Honorary Professor of Oil and Gas Engineering at the University of Calgary, prior to the implementation of the field-wide steamflood development of Tapia.