Qualitative Discuss on Well Test Curve Uncertainty Analysis in Remaining oil Evaluation of Thick Bottom Reservoir
International Journal of Oil, Gas and Coal Engineering
Volume 6, Issue 6, November 2018, Pages: 164-170
Received: Jul. 31, 2018;
Accepted: Oct. 18, 2018;
Published: Nov. 9, 2018
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Ren Chaoqun, Research Institute, CNOOC Ltd., Zhanjiang, China
Li Wenhong, Research Institute, CNOOC Ltd., Zhanjiang, China
Xue Guoqing, Research Institute, CNOOC Ltd., Zhanjiang, China
Chen Xin, Research Institute, CNOOC Ltd., Zhanjiang, China
Lin Ruimin, Research Institute, CNOOC Ltd., Zhanjiang, China
Zhang Peng, Research Institute, CNOOC Ltd., Zhanjiang, China
Wang Mingwei, Research Institute, CNOOC Ltd., Zhanjiang, China
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In directional wells of thick bottom water reservoir, partial perforation is usually applied to prevent rapid coning of bottom water. Because of the existence of interlayers, water driving conditions and remaining oil distribution become complex. In partially perforated wells in the survey area oil saturation of lower unperforated section can’t be tested directly due to the influence of completion structure. The "spherical flow" characteristics cannot be seen from the pressure derivative curve during the pressure building. The uncertainty analysis of well-test curve is used in the analysis of interpretation model, Kz/Kr value and boundary feature. The results show that the unperforated section at the lower part, slightly affected by the water flooding, contributes less to oil production. Through the study on reservoir numerical simulation mechanism, it’s concluded that in oil wells driven by bottom, water cut features rapid rise in early stage and slow rise in later stage. The water cut rise curve mainly belongs to a convex type. In contrast, in oil well driven by edge water, water cut rises slowly in early stage but rapidly later. The water cut curve is mainly a concave type. The research well shows a concave type in the water cut curve. Test data shows the well is driven by edge water under the influence of interlayer. The unperforated section at the lower part of reservoir where the remaining oil concentrates can become the target of further tapping.
Thick Bottom Water Reservoir, Well Test Curve, Uncertainty Analysis, Rising Law of Water Content, Remaining Oil
To cite this article
Qualitative Discuss on Well Test Curve Uncertainty Analysis in Remaining oil Evaluation of Thick Bottom Reservoir, International Journal of Oil, Gas and Coal Engineering.
Vol. 6, No. 6,
2018, pp. 164-170.
Copyright © 2018 Authors retain the copyright of this article.
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HE Fen, LI Tao, SU Yanchun, et al. Offshore Oilfield Perforation Scheme Optimization Research and Application [J]. Science Technology and Engineering, 2014, 14(27):198-201.
LIU Chuangang, BAO Chenyi, ZUO Kai, et al. Mechanical analyses on and solutions to anti-channeling for gravel-packing completion string [J]. Oil Drilling & Production Technology, 2016, 38(2):176-180.
LIU Nengqiang. Practical Modern Well Test Interpretation Method. Beijing: Petroleum Industry Press, 2008.
LIN Jiaen. Value and function of oil & gas well testing data [J]. Well Testing, 2016, 25(4):38-43.
OUYANG Weiping LIU Yuewu. Effects of Perforated Completion Parameters on Well Test Type Curves [J]. Acta Petrolei Sinica, 2013, 34(3):528-533.
ZHANG Junwei. Application of Part of the Perforated Well Test Interpretation Model in Hailaer Oilfield [J]. Well Testing, 2015, 24(5):33-35.
ZHANG Tongyi, YAN Dong, XU Shao. A Study of Method to Determine Resident Oil Distribution by Well Test Data [J]. Well Testing, 2001, 10(1, 2):10-12.
LIU Hong. Well testing interpreptation method research of preferential seepage channels [J]. Petroleum Geology and Engineering, 2015, 29(2):98-100, 136.
YANG Liu, HONG Chuqiao, REN Chaoqun, et al. Application of uncertainty analysis for reservoir numerical simulation in well test interpretation [J]. Well Testing, 2016, 25(4):23-25.
LIANG Shangbin. Oil saturation estimation by multi-cycle draw-down test [J]. Special Oil and Gas Reservoirs, 2016, 23(5):82-85.
YAN Jianli, QUAN Bo, DANG Shengguo. Comprehensive application of multiphase flow equivalent characterization well test analysis method in offshore edge-bottom water reservoir [J]. Reservoir Evaluation and Development, 2016, 6(5):29-34.
HE Qi. Application of well test analysis on reservoir numeral simulation [J]. Natural Gas Exploration and Development, 2005, 28(1):28-30.