Gas Injection Performance Of The Pembina "E" Lease

PUBLICATION RIGHTS RESERVED This paper is to be presented at the 36th Annual Fall Meeting of the Society of Petroleum Engineers of AIME in Dallas October 8–11, 1961, and is considered the property of the Society of Petroleum Engineers. Permission to publish is hereby restricted to an abstract of not more than 300 words, with no illustrations, unless the paper is specifically released to the press by the Editor of JOURNAL OF PETROLEUM TECHNOLOGY or the Executive Secretary. Such abstract should contain conspicuous acknowledgment of where and by whom the paper is presented. Publication elsewhere after publication in JOURNAL OF PETROLEUM TECHNOLOGY or SOCIETY OF PETROLEUM ENGINEERS JOURNAL is granted on request, providing proper credit is given that publication and the original presentation of the paper. Discussion of this paper is invited. Three copies of any discussion should be sent to the Society of Petroleum Engineers office. Such discussion may be presented at the above meeting and considered for publication in one of the two SPE magazines with the paper. A review of the performance of the Pan American-Hudson's Bay Pembina E Lease, Cardium Reservoir Pembina Field, has been made. Early in the history of this lease it was thought that primary recovery would be low. Waterflooding was considered uneconomical due to the low well injectivity and productivity. However, gas injection using an inverted nine-spot pattern has been shown to be economical. Gas injection facilities were paid out in eight months. Rapid rises in gas-oil ratio were experienced shortly after gas injection was started. This was found to be a direct result of local depletion around the individual producing wells and not gas channeling. When the oil producing rates were stabilized, the gas-oil ratio began to decline and is still declining. Calculated recovery estimates indicate that gas injection may increase the recovery of this lease by over 3,000,000 barrels, representing a 48% increase over ultimate primary recovery. Introduction The Pan American-Hudson's Bay Pembina E Lease comprises approximately 5,760 acres and is representative of the large portion of the Pembina Cardium Field characterized by a low producing capacity sand development. The E Lease is located in Township 47 and 48, Ranges 9 and 10, W5M in the Province of Alberta. (Figure 1) Under primary depletion the wells on this lease exhibited a gas-oil ratio performance abnormal to most oil reservoirs.