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The Permian Basin is a shale sedimentary basin approximately 250 miles wide and 300 miles long. It is located in western Texas and southeastern New Mexico. Chevron has been active in the Permian Basin through its legacy companies since the early 1920s.
From 2007 to 2022, Chevron’s Mid-Continent Business Unit (MCBU) in Midland, Texas, experienced several challenges in establishing and implementing an effective internal coating management strategy for the upstream, aboveground storage tanks (ASTs) built to American Petroleum Institution (API) Specification 12F. In this journey, Chevron has addressed and resolved the opportunities shared in this Paper and listed below to enable sustainable and reliable life of coating systems applied to ASTs working in produced water and crude oil service (upstream sector):
• issues around legacy specifications of tanks acquired from other owners• establishing the right coating systems for tanks internal surfaces• quality issues with coatings on newly constructed tanks ordered from local manufacturers• having multiple contracts for AST coatings field repairs• field hot work repairs of tank floors with a foam baseThe solutions that Chevron MCBU has implemented to address the issues above might be used by others to leverage from Chevron’s experience and practices to improve their AST coating management strategies.
The terminal is subdivided for Oil, Gas and Produced Water plants. Each of these plants has number of storage tanks. The age of the tanks varies between 15-25 years. The products held within these tanks varies, from crude oil, condensate, produced water, potable water, to off spec oil and diesel fuel.
Most of the tanks within the facility have a similar CP arrangement and design. Each tank base is protected by an impressed current grid mesh anode buried in compacted, clean, sand backfill beneath the tank base and is powered by a transformer-rectifier placed outside the bund wall or within an electrical switch room. Permanent reference electrodes are installed beneath all tank bases to enable accurate potential measurements. Reference electrodes vary from Copper/Copper Sulphate, Silver/Silver Chloride to Zinc.
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Dubai Petroleum (the Operator) operates five offshore oil fields in the Emirate of Dubai (Fateh, South West Fateh, Falah, Jallilah and Rashid), in addition to various onshore gas production, storage, distribution and import facilities, and LNG import facilities. The assets within these offshore fields consist of approximately 80 platforms of various sizes, comprising central bridge linked processing facilities in Fateh and South West Fateh, and outlying normally unmanned wellhead production platforms. These platforms are linked by a network of over 150 subsea pipelines, of which over 30 are presently operational sea water injection pipelines.