Application of Waterflood Characteristic Curves in the Estimation of Recoverable Reserves in the S Block of the Yanchang Oilfield

Siyao Liu

doi:10.62051/ijnres.v6n3.06

Authors

Siyao Liu

DOI:

https://doi.org/10.62051/ijnres.v6n3.06

Keywords:

Yanchang Oilfield S Block; Waterflood Characteristic Curves; Technical Recoverable Reserves Estimation; Recovery Factor Prediction.

Abstract

Waterflood characteristic curves are essential tools for estimating recoverable reserves in oilfields, accurately representing the dynamics of waterflood development and providing reliable support for reserve evaluations. They offer significant guidance for optimizing development plans and improving resource utilization efficiency. This study focuses on the S block of the Yanchang Oilfield, utilizing production dynamic data from 128 wells. The research systematically applies Type A waterflood characteristic curves and calibrated Type A waterflood characteristic curves to estimate recoverable reserves and predict waterflood recovery factors. The results show that the dynamic geological reserves calculated using the Type A waterflood curve amount to 714.29×104 t, with technical recoverable reserves of 260.49×104 t and a recovery factor of 36.47%. The calibrated Type A waterflood curve (calibration coefficient C=17.10) yields dynamic geological reserves of 1875×104 t, technical recoverable reserves of 613.21×104 t, and a recovery factor of 32.70%. A comparison indicates significant differences in the results of the two methods, primarily due to the calibration curve's adjustment for non-ideal waterflood conditions, such as reservoir heterogeneity and early development data deviations. This study not only enriches the application of waterflood characteristic curves in oilfield development but also provides data support for dynamic evaluation and subsequent optimization of development plans for the S block of the Yanchang Oilfield. It offers valuable insights for the estimation of recoverable reserves in similar waterflood reservoirs.

References

[1]Wang H. Application of improved water drive curve in recoverable reserves[J]. Petroleum Geology and Recovery Efficiency, 2012, 19(4): 84-86.

[2]Dou H E, Zhang H J, Shen S B. Correct understanding and application of waterflooding characteristic curve[J]. Petroleum Exploration and Development, 2019, 46(4):755-762.

[3]Li L Z, Han J Q, Chen J. Optimization of predicted recoverable reserves by using water drive type curves[J]. Xinjiang Petroleum Geology, 2017, 38(6): 719-722.

[4]Li C, Wang Y, Li W Z, et al. Application of type A water drive curve and production decline method in B Oilfield of Bohai Sea[J]. Complex Hydrocarbon Reservoirs, 2023, 16(1): 100-103.

[5]Lian J W, Wang Y Z, Yang J G. Determination of limit water cut of technically recoverable reserves calibrated by water drive curve[J]. Xinjiang Petroleum Geology, 2024, 45(6): 687-695.

[6]Chen Y Q, Du X. A comparison between the different forms of displacement characteristic curves and the criterion for the appearance of straight line section[J]. Petroleum Exploration and Development, 1986, (6): 55-63.

[7]Tong X Z. Study on statistical law of natural water and injecting water driving[J]. Petroleum Expoloration and Development, 1978, (6): 38-67.

[8]Tong X Z. Analysis of Well Production Performance and Reservoir Dynamics[M]. Beijing: Petroleum Industry Press, 1981, 39-60.

[9]Lou X J. Prediction method of recovery factor in the early-stage of reservoir development[J]. Chemical Engineering & Equipment, 2019, (10): 69-70.

[10]Li Y M, Wang H Z. Research on evaluation method of development effect of water-flooding reservoir[J]. Petrochemical Technology, 2020, 27(5): 196–198.

[11]Li H C, Meng Z Q, Shi H F, et al. Improvement of characterization method based on type A water drive curve[J]. Lithologic Reservoirs, 2018, 30(6): 125-130.

[12]Zhang J Q. A further theoretical discussion on water flooding curve and improvement of Tong’s chart[J]. China Offshore Oil and Gas, 2019, 31(1): 86-93.

[13]Zhang H Y, Wang Y J, Wang M N. Correct understanding and application of reasonable selection of waterflooding characteristic curve of type A, B, C and D[J]. Mathematics in Practice and Theory, 2021, 51(20): 82-92.

[14]Zhao Y S, Zhang S P, Huang F S. Improvement of the method of rectifying water drive characteristic curve[J]. Petroleum Exploration and Development, 1993, (3): 49-53.

[15]Chen Q L. Fundamentals of Oilfield Development Design and Analysis[M]. Beijing: Petroleum Industry Press, 1982, 5–11.

Wang J M, Zhang S. Exploring the characteristics and genesis of low amplitude structures on the Yishaan Slope, Ordos Basin[J]. Earth Science Frontiers, 2018, 25(2): 246-253.