Gas Generation and its benefits in the Grosmont reservoir during thermal recovery process

Authors: Moslem Hosseininejad, Muhammad Atif, Sandeep Solanki, Laricina Energy Ltd. And Apostolos Kantzas, University of Calgary

Source: This paper was prepared for presentation at the SPE Canada Heavy Oil Technical Conference held in Calgary, Alberta, Canada, 15—16 February 2017

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The Saleski steam injection Pilot in Alberta Canada has proven recovery from a naturally fractured bitumen reservoir in the Grosmont carbonate. Non-condensable gases (NCG) generation and their behavior and flow in the reservoir have a significant effect on the performance of the thermal steam injection processes. This becomes even more important in a carbonate fractured reservoir where gas saturation and distribution largely impact Gas Oil Gravity Drainage (GOGD) mechanism in the Cyclic SAGD recovery method.

The Saleski Pilot, a joint venture between Laricina Energy Ltd.(Laricina) and Osum Oil Sands Corp. started in 2010 to exploit the Grosmont carbonate fractured reservoir. Saleski pilot operation was suspended in September 2015 as the goals of the project were achieved. During close to five years of operation of the pilot a great deal of data on all important parameters were collected, including gas production rates and gas composition. The NCG production data was reviewed for the whole period of operation and total GOR as well as individual gases GOR are calculated. This information was used to calibrate a kinetic reaction model which is implied in the numerical simulation work to examine the effect of NCG.

To better understand gas production and observed concentration of CO2, a kinetic model was developed and calibrated. This model was then implemented into reservoir numerical simulations to develop further insights into thermal bitumen recovery from the Grosmont and improve history matching of the Saleski pilot.

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