Experimental investigation of the annular cross-sectional distribution of cuttings bed with drillpipe rotation in horizontal wells

• Published in: Powder technology 2024-03, Vol.436, p.119520, Article 119520
• Main Authors: Jing, Silin, Song, Xianzhi, Zhou, Mengmeng, Xu, Zhengming, Sun, Yi, Xiao, Hao, Abou-Kassem, Abdulla, Kuru, Ergun
• Format: Article
• Language: English
• Subjects: Asymmetric cuttings bed; Drillpipe rotation; Flow patterns; Horizontal wells; Laser measurement; Prediction correlation
• ISSN: 0032-5910; 1873-328X
• DOI: 10.1016/j.powtec.2024.119520

The cuttings bed height is crucial for assessing hole cleaning but assumes symmetry, which is not accurate during drillpipe rotation. A laser measurement method is used to investigate the cuttings bed cross-section. 71 tests in horizontal wells under rotary drilling conditions were conducted, revealing six types of cuttings bed cross-sectional distribution. By investigating the effects of drillpipe rotation speed, flow rate, and wellbore inclination on the wetted perimeters and dip angles of cuttings bed surface in three fluids, the flow pattern diagrams are established and the asymmetric cuttings bed area is calculated. The observed characteristics simplified flow patterns into four groups. Using these groups with the multiple linear regression method, a correlation predicting the wetted perimeters and dip angles was established, with an accuracy exceeding 80%. These findings are vital for improving drilling operations and minimizing field risks by providing insights into drillpipe rotation's impact on cuttings bed. [Display omitted] •An experimental method for measuring asymmetric cuttings bed is presented.•The effect of drillpipe rotation on cuttings bed cross-section is analyzed.•Flow pattern diagrams of cuttings bed are established based on drillpipe rotation.•A calculation method for the asymmetric cuttings bed area is presented.•Correlations of the cross-sectional cuttings bed are proposed using experimental results.