The reservoir evaluations NITEC has performed over the years vary in size, complexity, and reservoir type, reflecting the variations found in petroleum reservoirs worldwide.
Our projects include volatile oil, medium and heavy oils, gas-condensate, gas, and gas storage fields found in clastic and carbonate lithologies with varying degrees of faulting and fracture complexity. Due to the complexity of many of our projects, we have found that the available technologies or processes are often inadequate to resolve certain reservoir issues. Accordingly, NITEC has developed appropriate technologies and software to address these issues.
A highly fractured and faulted reservoir in Mexico with an active aquifer was successfully characterized by NITEC’s in-house technology. Reservoir simulation resulted in the identification of highly productive zones which were confirmed by drilling.
Verification of the process was carried out for a thermal recovery process – insitu upgrading of hydrocarbons. Thermal simulation correctly correlated with laboratory results and a U.S. field evaluation considered Huff-n-Puff and continuous injection.
This light-oil field in Venezuela with a thin oil rim and overlying gas condensate zone was characterized and simulated. Understanding reservoir performance required identification and characterization of asphaltene deposition in the oil rim and detailed simulation of over 100 wells with multiple production strings. Simulation predictions provided new completion alternatives and workovers to improve future oil recovery.
An integrated reservoir study was carried out on a near depleted oil field in Wyoming discovered in 1916 with over 700 completions. The simulation model history match indicated substantial remaining oil in place. Extended black-oil simulation of CO2 WAG and continuous CO2 injection processes indicated significant tertiary oil recovery potential. Full-field development is in the planning stages.
Fracture characterization using seismic, wellbore and well performance data:
Limited performance and wellbore data in a recent oil discovery in India suggested the existence of a natural fracture system. Seismic, wellbore, and performance data, along with NITEC’s unified capillary pressure technology were used to confirm and describe the vertical and areal fracture distribution. Field development is being planned accordingly.
Secondary or tertiary recovery:
A prolific oil field in Wyoming with significant primary and secondary recovery was evaluated for bypassed secondary and tertiary oil potential. The natural fractures in the formation and the historical water injection resulted in little additional secondary oil recovery potential. Accordingly, the remaining oil in place was found to be insufficient to warrant an economically viable CO2 injection program. Other tertiary recovery processes are under consideration.