In 2011 January, the Petroleum Company of Trinidad and Tobago (Petrotrin) embarked on an initiative to rejuvenate its mature land fields by using different intervention strategies to monetize the remaining reserves in its inventory of idle wells. This exercise included but was not limited to annexation of idle wells to Lease Operators and a reactivation exercise seeking to generate oil production from a total of one thousand, seven hundred and twenty six (1726) inactive wells, which included three hundred (300) inactive wells that were in close proximity to the active lease operatorship blocks and were earmarked for lease out. This paper presents results from the reactivation exercise.

The candidates reviewed for reactivation were in mostly shallow, unconsolidated reservoirs, onshore Trinidad. Most of Trinidad's onshore crude oil producing reservoirs is considered to be mature which means that the oil reserves would have been, or are still being, produced by primary means, with Enhanced Oil Recovery (EOR) methods being used in some reservoirs. With declining oil production being experienced currently, there is the need to find alternative ways of arresting the declining production trend. One method of doing this is by tapping into the proven, idle reserves from wells that may have been taken off production due to low production rates and unfavorable economics at the time. Identification and reactivation of candidates is therefore important in helping to realize the full potential of mature producing fields such as those onshore Trinidad and to recover potentially bypassed pay. The reactivation project applies current technologies for identifying and unlocking potential in inactive wells.

A total of one thousand and seven hundred (1700) wells were screened as candidates for the Land Reactivation Project as at September, 2014. This paper reports on the performance of the wells reactivated for the period of January, 2011 to September, 2014, a period of approximately four fiscal years. This phase of review and evaluation was termed Phase Four (4) of the Reactivation Project and it forms the basis of this paper.

The total number of wells reactivated during this period was two hundred and seventy six (276), with a total of one hundred and ninety two (192) wells maintaining active status and eighty four (84) wells inactive at September, 2014. This equates to an overall project success rate of seventy percent (70%). Approximately fourteen million dollars ($TT 14million) profit, for fiscal year 2013-2014 was realized. These results prove that reactivations are an economically attractive venture.

Due to fallen oil prices at this time, exploration and production of new reserves to boost declining oil production may not be economically attractive and reactivation of idle wells may prove to be a more feasible option in some instances.

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