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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.

References

1. Nguyen Thuс Khang et al., Razvitie sistemy sbora, podgotovki i transporta nefti i gaza v SP “V'etsovpetro” s uchetom podklyucheniya marginal'nykh mestorozhdeniy (Development of a system for collecting, preparing and transporting oil and gas in the Vietsovpetro JV, taking into account the connection of marginal deposits), Proceedings of scientific conference on the 35th anniversary of the creation of Vietsovpetro JV, Vung Tau, 2016, p. 30.

2. Akhmadeev A.G., Avdeev A.S., Laybold S.A., Ivanov S.A., Design concept for the offshore fields facilities construction (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 1, pp. 98–101.

3. Akhmadeev A.G., Tong Canh Son, Ivanov S.A., Comprehensive approach to provide high-paraffin oil transportation from the offshore fields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 6, pp. 100–103.

4. Nguyen Thuс Khang et al., Transport vysokoparafinistykh neftey mestorozhdeniya Yuzhnyy Drakon – Doy Moy s nizkoy proizvoditel'nost'yu (Transportation of high-paraffin oils of the South Dragon - Doi Moi field with low productivity), Proceedings of Oil and Gas Forum “Problemy i metody obespecheniya nadezhnosti i bezopasnosti sistem transporta nefti, nefteproduktov i gaza” (Problems and methods for ensuring the reliability and safety of oil, oil products and gas transport systems), Ufa, 2011, pp. 114–115.

5. Akhmadeev A.G., Pham Thanh Vinh, Le Dang Tam, Implementation of adaptive gathering systems as the method to optimize oil transportation at offshore field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 2, pp. 78–81.

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.

References

1. Nguyen Thuс Khang et al., Razvitie sistemy sbora, podgotovki i transporta nefti i gaza v SP “V'etsovpetro” s uchetom podklyucheniya marginal'nykh mestorozhdeniy (Development of a system for collecting, preparing and transporting oil and gas in the Vietsovpetro JV, taking into account the connection of marginal deposits), Proceedings of scientific conference on the 35th anniversary of the creation of Vietsovpetro JV, Vung Tau, 2016, p. 30.

2. Akhmadeev A.G., Avdeev A.S., Laybold S.A., Ivanov S.A., Design concept for the offshore fields facilities construction (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2016, no. 1, pp. 98–101.

3. Akhmadeev A.G., Tong Canh Son, Ivanov S.A., Comprehensive approach to provide high-paraffin oil transportation from the offshore fields (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2015, no. 6, pp. 100–103.

4. Nguyen Thuс Khang et al., Transport vysokoparafinistykh neftey mestorozhdeniya Yuzhnyy Drakon – Doy Moy s nizkoy proizvoditel'nost'yu (Transportation of high-paraffin oils of the South Dragon - Doi Moi field with low productivity), Proceedings of Oil and Gas Forum “Problemy i metody obespecheniya nadezhnosti i bezopasnosti sistem transporta nefti, nefteproduktov i gaza” (Problems and methods for ensuring the reliability and safety of oil, oil products and gas transport systems), Ufa, 2011, pp. 114–115.

5. Akhmadeev A.G., Pham Thanh Vinh, Le Dang Tam, Implementation of adaptive gathering systems as the method to optimize oil transportation at offshore field (In Russ.), Neftyanoe khozyaystvo = Oil Industry, 2019, no. 2, pp. 78–81.


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