Lithologic Reservoirs ›› 2020, Vol. 32 ›› Issue (6): 146-153.doi: 10.12108/yxyqc.20200614

• OIL AND GAS FIELD DEVELOPMENT • Previous Articles     Next Articles

Quantitative characterization of sweep coefficient of water drive in horizontal well for offshore bottom water reservoir

ZHANG Yunlai, CHEN Jianbo, ZHOU Haiyan, ZHANG Jilei, ZHANG Wei   

  1. Tianjin Branch of CNOOC Ltd., Tianjin 300459, China
  • Received:2020-01-25 Revised:2020-05-27 Online:2020-12-01 Published:2020-10-30

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Abstract: In the middle and late stage of the development of offshore bottom water reservoir, there are some problems, such as unclear understanding of water drive oil law and difficulty in quantitative description of water drive sweep coefficient between horizontal wells. Taking Q oilfield in Bohai Sea as an example,the fine numerical model of bottom water reservoir was established by using indoor one-dimensional long core water flooding experiment and reservoir numerical simulation method, the variation law of flooding efficiency and cross-well water flooding sweep coefficient between horizontal wells after long-term water flooding in bottom water reservoir was carried out. The results show that the displacement multiple in the water displacement experiment was increased to 2 000 PV and the displacement speed was increased from 1 mL/min to 5 mL/min, and the displacement efficiency was increased by 15%-20% when the displacement efficiency is more than 100 PV. Based on the numerical simulation of horizontal well water drive sweep volume, the phase permeability curve after high-power water drive was introduced, and the grid accuracy of the model was improved to 10.0 m×10.0 m×0.3 m,realizing the fine characterization of water drive sweep volume. The calculated sweep coefficient was reduced from 66.7% of the original model to 54.6%, which improves the calculation accuracy of the model. The height and spacing of oil string in horizontal well distribution are the main control factors affecting cross-hole water drive sweep coefficient. The lower the oil column height in horizontal section is,the larger the well spacing is,and the lower the sweep coefficient of cross-hole water drive is. Based on the research results,the cross-well water drive sweep coefficient chart of offshore bottom water reservoir was established,and the boundary parameters of horizontal well layout in bottom water reservoir were defined. The well distance of the well is 100-150 m,the height of the oil column is 6-8m,the well control reserve is(15-25)×104m3,the maximum extraction of the horizontal well is 2 000 m3/d,the limit economic oil production is 10 m3/d,and the accumulated oil production of the horizontal well can reach more than 50 000 m3. The research results have successfully guided the implementation of 21 infill horizontal wells in bottom water reservoir of offshore Q oilfield,and can provide reference for high efficiency potential tapping in the middle and late stage of the bottom water reservoir.

Key words: offshore bottom water reservoir, ultra-high water cut stage, displacement multiple, displacement efficiency, horizontal well, sweep volume, infill limit, mine application

CLC Number: 

  • TE341
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