Single-Tank Dual-Electric Submersible Pump Technology in Offshore Extended Reach Wells

ZHANG Junbin; YANG Zhidi; QIN Shili; CAO Bobo; WANG Zhiwei; ZHANG Yongtao

doi:10.11911/syztjs.2025028

Volume 53 Issue 2

Apr. 2025

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Petroleum Drilling Techniques > 2025 > 53(2): 46-51. > DOI: 10.11911/syztjs.2025028

ZHANG Junbin, YANG Zhidi, QIN Shili, et al. Single-tank dual-electric submersible pump technology in offshore extended reach wells [J]. Petroleum Drilling Techniques, 2025, 53(2)：46−51. DOI: 10.11911/syztjs.2025028

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Single-Tank Dual-Electric Submersible Pump Technology in Offshore Extended Reach Wells

Technical Center of Deepwater Engineering, Shenzhen Branch of CNOOC Limited, Shenzhen, Guangdong, 518000, China

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Received Date: January 02, 2025
Revised Date: March 30, 2025
Available Online: April 05, 2025

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Abstract

Externally arranged cables are prone to damage when offshore extended reach wells adopt conventional dual-tank dual-pump technology for production. Moreover, the dual-tank dual-pump configuration creates excessive projection area, increasing risks of flow restriction and erosion. In the dual Y-joint structure, the combined projection area of the bypass tubing and high-capacity electric submersible pumps (ESPs) exceeds the casing’s inner diameter, with the bypass tubing also facing erosion risks. To address these challenges, a machine-assisted production scheme featuring a single-tank dual-ESP configuration was developed through a comparative analysis of actual equipment structures by using design software. By employing specialized tools such as in-tank packers and expandable rotating subs to arrange cables and pipelines within the tank, a single-tank dual-ESP technology was formed. Research results show that this technology reduces the outer diameter of the tank’s projection to 193.7 mm, significantly smaller than the ESP’s outer diameter of 215.9 mm in the dual Y-joint structure. This solution effectively mitigates frequent cable damage and severe equipment erosion in traditional external ESP arrangements. Successful field application of the technology has been achieved in the Enping 21−4 Oilfield and Liuhua Oilfield in the South China Sea. The research results provide technical support for the popularization and application of ESPs in offshore extended reach wells.
- single-tank dual-ESP system,
- cable protection,
- erosion,
- extended reach well,
- Enping 21−4 Oilfield

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