Study on Numerical Simulation of Cementing Displacement Efficiency of Horizontal Expansion Well Sections in Shale Reservoir

doi:10.3969/j.issn.1006-6535.2023.04.017

Abstract

Abstract: Improving the displacement efficiency of horizontal expansion well section is one of the ways to improve the quality of horizontal well cementing, but the relevant study assumptions are too ideal and do not match the actual situation in the field. For this reason, a three-dimensional displacement simulation study of cementing slurry in elliptical horizontal expansion well section was carried out by using CFD numerical simulation method and taking Gulong Shale Reservoir as an example. The result shows that the higher the eccentricity, the more significant the flow velocity difference at the wide and narrow gap of the expansion well section, and when the eccentricity was 0.7, the flow velocity difference reached 2.00 m/s, which made it difficult for drilling fluid to be completely displaced.When the maximum expansion well section was located in the middle of the expansion section, the cement slurry displacement efficiency was the highest, and when the expansion section was close to one side of maximum expansion section, the cement slurry displacement efficiency became poor, and it was easy to form a drilling fluid stagnation zone.Under the condition of high casing eccentricity, the displacement efficiency improved significantly with the increase of casing speed, and when the eccentricity was 0.7, the casing speed increased from 30 r/min to 40 r/min, and the displacement efficiency increased by 1.17 percentage points; the spindle rotation changed the geometry of the expansion well section, and the displacement efficiency changed significantly when the spindle azimuth was 60-120 °, and decreased by 0.81 percentage points when the spindle azimuth increased from 60 ° to 90 °. The study results can help to improve the cementing quality of elliptical horizontal expansion well sections in shale reservoirs.

Key words: displacement efficiency, expansion well section, horizontal well, cementing quality, cement slurry, Gulong Shale, Daqing Oilfield

CLC Number:

TE256

Sun Xiaofeng, Tao Liang, Zhu Zhiyong, Yu Furui, Sun Minghao, Zhao Yuanzhe, Qu Jingyu. Study on Numerical Simulation of Cementing Displacement Efficiency of Horizontal Expansion Well Sections in Shale Reservoir[J]. Special Oil & Gas Reservoirs, 2023, 30(4): 139-145.

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