Cementing Technologies for Ultra-Deepwater Development Wells in Block X of the South China Sea

FENG Yingtao; MA Rui; CUI Ce; ZHANG Fuming; WEN Dayang; ZHAO Jun

doi:10.11911/syztjs.2025057

Volume 53 Issue 3

Jun. 2025

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Petroleum Drilling Techniques > 2025 > 53(3): 90-97. > DOI: 10.11911/syztjs.2025057

FENG Yingtao, MA Rui, CUI Ce, et al. Cementing technologies for ultra-deepwater development wells in Block X of the South China Sea [J]. Petroleum Drilling Techniques, 2025, 53(3)：90−97. DOI: 10.11911/syztjs.2025057

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Cementing Technologies for Ultra-Deepwater Development Wells in Block X of the South China Sea

FENG Yingtao^{1, 2,},
MA Rui^{1, 2, ,},
CUI Ce^{1, 2},
ZHANG Fuming^{1, 2},
WEN Dayang^{1, 2},
ZHAO Jun^{1, 2}

1.
China Oilfield Services Limited, Langfang, Hebei, 065201, China
2.
CNOOC Key Laboratory of Offshore Driling Fluids and Cementing, Langfang, Hebei, 065201, China

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Received Date: February 07, 2025
Revised Date: April 28, 2025
Available Online: May 23, 2025

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Abstract

As the exploration and development of deepwater and ultra-deepwater oil and gas resources in the ocean proceed, the complex stratigraphic environment has brought more severe challenges to cementing operations. In an environment of ultra-deep water with low temperature, high pressure, and possibly natural gas hydrates, conventional cement slurry is difficult to meet the safety requirements of cementing operations. In order to achieve long-term and effective cementing, a set of cementing technologies applicable to ultra-deepwater development wells was developed, including a cement slurry with low heat of hydration suitable for ultra-deepwater and low-temperature environments. Compared with conventional cement slurry, the heat release of hydration of this cement slurry is reduced by more than 23%, effectively reducing the risk of hydrate decomposition and causing no effect on the strength of cement. In addition, a heat transfer model for marine ultra-deepwater wellbores was established. Based on the iterative solution of this model, a simulation and prediction software for marine ultra-deepwater bottom hole circulating temperature (BHCT) was developed, and the accuracy of the heat transfer model for marine ultra-deepwater wellbores was verified through the developed BHCT downhole measurement tools. Meanwhile, a highly efficient oil-based flushing fluid with good emulsification and wetting reversal effects was developed, which improved the flushing efficiency of oil-based filter cakes. The 11 development wells in Block X of the South China Sea have adopted the cementing technologies for ultra-deepwater development wells. The cementing construction went smoothly, and the cementing quality was excellent. Research and field applications show that the cementing technologies for ultra-deepwater development wells can solve the technical difficulties of cementing in the low-temperature, high-pressure, and possibly hydrate-containing environment of ultra-deep water, providing technical support for the development of ultra-deepwater oil and gas resources.
- ultra-deepwater development well,
- cementing technology,
- natural gas hydrate,
- cement slurry,
- bottom hole circulating temperature,
- flushing fluids

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References

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Cementing Technologies for Ultra-Deepwater Development Wells in Block X of the South China Sea

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