Production optimization from mature assets with limited well instrumentation, aging facilities and depleting reservoir energy is a big challenge. The economic viability of retrofitting these assets to enable - instrumentation for seamless data capture, remote transmission, storage and integration with engineering applications is sometimes challenged.

A methodology and practical approach for designing and implementing integrated field (i-field)in a mature joint venture asset in Chevron Nigeria is presented in this paper. The various fields span several kilometers cutting across different terrain including land, swamp and shallow offshore locations with maximum water depth of 150 ft. The first well spudded in December 1963 came on production in March 1965 and still producing 48 years later (in 2013). There are more than thirty fields currently producing across over 2.2 MM acres. The extent of the geographical spread not only comes with different terrains but also presents complexity with design and application of i-field within Chevron Nigeria Limited (CNL).

The identification, prioritization and deployment of petro-technical transformational workflows were discussed. The implementation of a robust IT architectural foundation is pivotal to the adoption of existing and emerging solutions. The methodology for ranking the assets was largely based on current production and remaining reserves, existing downhole or wellhead instrumentation, availability of SCADA network and ease of implementation through a proof of concept (POC). Using a phased approach, multiple components of the i-fieldprogram were implemented. The first wave of solutions recorded a value of $2.5 MM in 2012 from better collaboration, production optimization, and management by exception. In addition, significant savings resulting from improved productivity, safety and operation excellence was attained in several assets/fields that are more than 40 years old. The overall impacts of these deployments have resulted in early gains resulting from reduction in OPEX and loss production opportunity (LPO) and improved reliability.

Some of the challenges encountered include ability to retrofit existing wells and facilities especially with diminishing reserves and aging facilities. Value proposition for marginal field and lack or limited infrastructure related to bandwidth for communication was a big challenge. In addition, best practices and lessons learned for development and deployment of i- fieldinitiatives in mature brown fields are presented.

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