Study on the Production and Injection Performance of Clustered Boreholes in Horizontal Multilateral Wells in Tight Reservoirs

doi:10.3969/j.issn.1006-6535.2023.05.010

Abstract

Abstract: The multi-stage and multi-cluster fracturing of horizontal wells is mostly used for the development of the tight oil, the fracture shape and extension are difficult to be precisely controlled, and the fracturing fluid contamination seriously jeopardizes the surrounding water bodies. To address the above problems and to utilize tight oil reservoirs more safely and efficiently, the clustered borehole type horizontal multilateral well pattern was proposed for oil production, and an oil drainage model based on the oil-water phase seepage distribution mechanism was established by simulation software. Through the capacity prediction, the fishbone-shaped horizontal multilateral well with optimal branching angle and location arrangement was selected, and this well pattern was applied to the clustered borehole type horizontal multilateral well and its production and injection performance was studied. The study shows that the clustered borehole well pattern has wider oil drainage area and faster water breakthrough. The clustered borehole well pattern has excellent production and injection performance, shorter construction period, higher safety and efficiency. After 10 a of depletion production under the same conditions, the clustered borehole well pattern increases production by about 11.12% compared with the fishbone-shaped horizontal multilateral well; the average daily oil production of the LD-1 platform Chang 71 well group increases by 13.21% after 4 a of simulated production using the clustered borehole well pattern; neighboring wells were extracted under simulated injection and extraction conditions for 20 a, the clustered borehole well pattern is used as the injection well, and the cumulative oil production of a single well increases by about 23.7% compared with that of the fishbone-shaped horizontal multilateral well. The study can provide technical references for the structural optimization of the clustered borehole well pattern and the efficient exploitation of tight reservoirs.

Key words: horizontal multilateral well, clustered borehole, production and injection performance study, seepage analysis, tight reservoirs

CLC Number:

TE348

Yi Xianzhong, Qiao Shaofeng, Liu Hangming, He Dongxu, Yao Xiutian, Chen Hui. Study on the Production and Injection Performance of Clustered Boreholes in Horizontal Multilateral Wells in Tight Reservoirs[J]. Special Oil & Gas Reservoirs, 2023, 30(5): 77-83.

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