Optimal gathering and transportation assurance of well production of small offshore oilfields

UDK: 622.692.4
DOI: 10.24887/0028-2448-2019-10-104-107
Key words: oil treatment and transportation, high-paraffin oil, offshore field, marine stationary platform, wellhead platform, floating storage and offloading unit, product pumpless transportation
Authors: A.G. Akhmadeev (Vietsovpetro JV, the Socialist Republic Vietnam, Vung Tau), Pham Thanh Vinh (Vietsovpetro JV, the Socialist Republic Vietnam, Vung Tau), Chau Nhat Bang (Vietsovpetro JV, the Socialist Republic Vietnam, Vung Tau), A.I. Mikhailov (Zarubezhneft JSC, RF, Moscow)

Nowadays, Vietnam offshore consists of many structures with relatively poor recoverable reserves. Development of these structures by stand-alone facilities for production, treatment, reservoir pressure maintenance and exportation is often unprofitable. The article covers the examples that ensure profitability of small offshore fields by tying in to the existing oil-and-gas production infrastructure. Continuously developed fields, after their production peak, have excess capacity for oil-and-gas treatment, reservoir pressure maintenance and compressing, which require high upkeep operational costs. Hook-up of small fields’ production may prolong their profitability. Assurance of safe pipeline transportation and treatment of small fields’ production is very important, especially for Vietnam offshore paraffin oil with high pour point. Based on major experience, Vietsovpetro has developed and implemented the methods to optimize the transportation, including the technology of oil treatment with pour point depressant, dissolution of high-paraffin oil with low-viscous thinning agents, oil transportation in gas-saturated and gas-liquid conditions, heat insulators and technology of subsea pipeline cleaning. These actions resulted in successful hook-up of five small fields and developing the technology to tie-in two more prospects. Transportation technologies and methods developed and applied in Vietsovpetro, as well as adaptation of the existing oil-and-gas field gathering systems assure safe and continuous operation of small fields at the lowest costs.


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