Reservoir Science
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TY - JOUR AU - Hu, Yunfeng AU - Yang, Ye PY - 2026 DA - 2026/02/28 TI - A Comparative Study on Drag Reduction Methods for Continental Shale Drilling in the Fuxing Block, Southeastern Sichuan Basin JO - Reservoir Science T2 - Reservoir Science JF - Reservoir Science VL - 2 IS - 2 SP - 81 EP - 96 DO - 10.62762/RS.2025.790790 UR - https://www.icck.org/article/abs/RS.2025.790790 KW - continental shale KW - horizontal well KW - drag/torque KW - AHP model KW - reliability analysis model AB - Extended-reach horizontal wells in continental shale formations of the Fuxing Block, southeastern Sichuan Basin, face prominent challenges, including drag and torque exceeding 50 metric tons and difficulties in weight-on-bit (WOB) transfer. Continental shale is characterized by high porosity, high permeability, distinct amphiphilic properties, and rapid performance degradation of oil-based drilling fluids (OBDF). These features lead to the formation of thick filter cakes and compacted cuttings beds, which further exacerbate abnormal drag. Existing research often focuses on single technical aspects, lacking integrated, full-cycle multi-factor coupling analysis. Based on field data from 14 drilled wells in the block, this study standardizes key factors through data preprocessing, quantifies process weights using the Analytic Hierarchy Process (AHP) model, and fits censored drag data via the Reliability Analysis model. Results indicate that design optimization contributes most significantly to drag reduction (weight: 0.5499). The critical failure drag for encapsulated lubricants is identified as 61.74 t. For wells with horizontal sections exceeding 2500 m, the application of floating casing technology enhances drag control reliability. SN - 3070-2356 PB - Institute of Central Computation and Knowledge LA - English ER -
@article{Hu2026A,
author = {Yunfeng Hu and Ye Yang},
title = {A Comparative Study on Drag Reduction Methods for Continental Shale Drilling in the Fuxing Block, Southeastern Sichuan Basin},
journal = {Reservoir Science},
year = {2026},
volume = {2},
number = {2},
pages = {81-96},
doi = {10.62762/RS.2025.790790},
url = {https://www.icck.org/article/abs/RS.2025.790790},
abstract = {Extended-reach horizontal wells in continental shale formations of the Fuxing Block, southeastern Sichuan Basin, face prominent challenges, including drag and torque exceeding 50 metric tons and difficulties in weight-on-bit (WOB) transfer. Continental shale is characterized by high porosity, high permeability, distinct amphiphilic properties, and rapid performance degradation of oil-based drilling fluids (OBDF). These features lead to the formation of thick filter cakes and compacted cuttings beds, which further exacerbate abnormal drag. Existing research often focuses on single technical aspects, lacking integrated, full-cycle multi-factor coupling analysis. Based on field data from 14 drilled wells in the block, this study standardizes key factors through data preprocessing, quantifies process weights using the Analytic Hierarchy Process (AHP) model, and fits censored drag data via the Reliability Analysis model. Results indicate that design optimization contributes most significantly to drag reduction (weight: 0.5499). The critical failure drag for encapsulated lubricants is identified as 61.74 t. For wells with horizontal sections exceeding 2500 m, the application of floating casing technology enhances drag control reliability.},
keywords = {continental shale, horizontal well, drag/torque, AHP model, reliability analysis model},
issn = {3070-2356},
publisher = {Institute of Central Computation and Knowledge}
}
Copyright © 2026 by the Author(s). Published by Institute of Central Computation and Knowledge. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/), which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. 
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