Novel Water-Based Mud for Low-Permeable Reservoir in South China Sea

Siyuan Lin, Yunhu Lu (), Zhiqin Liu, Wei Lu and Po Hu
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Siyuan Lin: School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Yunhu Lu: School of Petroleum Engineering, China University of Petroleum, Beijing 102249, China
Zhiqin Liu: CNOOC China Limited, Zhanjiang Branch, Zhanjiang 524057, China
Wei Lu: Oil Production Research Institute of Huanqing Oil Production Plant of PetroChina Yumen Oilfield Company, Qingyang 745700, China
Po Hu: Oil Production Research Institute of Huanqing Oil Production Plant of PetroChina Yumen Oilfield Company, Qingyang 745700, China

Energies, 2023, vol. 16, issue 4, 1-9

Abstract: Conventional reservoir drill-in fluids used for drilling reservoirs in Weizhou Oilfield encounter rheological problems that result in technical problems such as hole-cleaning in openhole horizontal intervals. Hence, novel drill-in fluid was developed by optimizing the additive quantity and particle size distribution. Lab tests showed that novel drill-in fluids boast high low shearing rate viscosity, and provide promising cutting, carrying, and suspension capabilities. Furthermore, the novel drill-in fluids performed well in reservoir protection, with a permeability recovery rate of more than 90%. The novel drill-in fluids also have high inhibition capabilities with a linear expansion rate of mud shale as low as 10%, with a rolling recovery rate of up to 96.48%. Field application results showed no pipe-stuck was encountered during tripping in the horizontal interval when using the novel drill-in fluid. Moreover, by using the novel drill-in fluids, skin factor was reduced from 20.0 to −3.0, and daily oil production was double what was expected. It was concluded that novel drill-in fluids meets the demand of horizontal drilling intervals in Weizhou Oilfield and improves hole-cleaning and reservoir protection in the horizontal well.

Keywords: drill-in fluid; additives; properties of drill-in fluid; formation damage prevention; Weizhou Oilfield (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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