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Formation Damage and Protection Technology for Medium-Low Permeability Reservoir in Late Development Stage

  • INNOVATIVE TECHNOLOGIES OF OIL AND GAS
  • Published:
Chemistry and Technology of Fuels and Oils Aims and scope

The first member of Dongying formation is the main production reservoir of Nanpu 1-5 block in Jidong Oilfield located in northern Bohai Bay Basin, China. The formation was put into development as early as 2005, and it has entered late development stage. Formation characteristics changed constantly during the development by water flooding, formation damage mechanisms were not well understood, which resulted in the incompatibility of formation protection technology with the reservoir so that further formation damage happened. For wells newly putted into production, significantly lower production was obtained than the expected for years. Based on the measurement and comparison of formation characteristic, remaining oil distribution and damage mechanisms in early and late development stage, formation protection drilling fluid are conducted and optimized. The reservoir analysis results show that with constant development, pore-throat sizes decrease, heterogeneity intensify, and remaining oil is mostly trapped in the the low permeability strip, where water block damage rate is 10–29%, solid damage rate is about 10%, and the damage rate of liquid sensitivity is 5–10%. The synergy of broad-spectrum film-forming plugging and water blocking prevention was utilized to optimize formation protection drilling fluid system, the recovery value of the intercepted permeability recovered to more than 92%. Field application of the system on 17 wells showed an excellent formation protection effect, which meet the urgent formation protection needs of the late development of Nanpu 1-5 block. The technological ideas can be a valuable reference for other similar reservoir in China and around the world.

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Authors and Affiliations

  1. Drilling and Production Technology Research Institute of Jidong Oilfield Company, Tangshan, Hebei, China

    Xiaohong Wu, Jinxia Chen, Yunfeng Li, Yan Zhou & Kuanliang Zhu

Authors
  1. Xiaohong Wu
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  2. Jinxia Chen
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  3. Yunfeng Li
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  4. Yan Zhou
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  5. Kuanliang Zhu
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Corresponding author

Correspondence to Xiaohong Wu.

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Translated from Khimiya i Tekhnologiya Topliv i Masel, No. 2, pp. 74–79 March– April, 2022.

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Wu, X., Chen, J., Li, Y. et al. Formation Damage and Protection Technology for Medium-Low Permeability Reservoir in Late Development Stage. Chem Technol Fuels Oils 58, 370–378 (2022). https://doi.org/10.1007/s10553-022-01394-4

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  • DOI: https://doi.org/10.1007/s10553-022-01394-4

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