American Society of Civil Engineers


Study on Correction of Safe Mud Weight Window (SMWW) for Horizontal Well


by Jingyuan Zhao, (Lecturer, College of Petroleum Engineering, Northeast Petroleum University; Daqing 163318. E-mail: millerzjy@163.com), Yuxue Sun, (Professor, College of Petroleum Engineering, Northeast Petroleum University; Daqing 163318. E-mail: syx1760@163.com), Qiming Li, (Master, College of Petroleum Engineering, Northeast Petroleum University; Daqing 163318. E-mail: userlqm@126.com), and Chunliang Zhang, (Engineer, The Second Production Factory, Daqing Oil Field Company Limited; Daqing 163414. E-mail: c2zhangchl@petrochina.com.cn)
Section: Trenchless Technologies, pp. 2151-2159, (doi:  http://dx.doi.org/10.1061/41202(423)226)

     Access full text
     Purchase Subscription
     Permissions for Reuse  

Document type: Conference Proceeding Paper
Part of: ICPTT 2011: Sustainable Solutions For Water, Sewer, Gas, And Oil Pipelines
Abstract: In drilling operation, to determine the safe mud weight window rationally is very important for borehole stability. Conventional safe mud weight window is based on fracture pressure and caving pressure. However, drilling practice experience has shown, although the mud weight meets the standard of SMWW, there are some borehole problem such as lost circulation and cave-in in the process of tripping because of swabbing and surging. Compared with the vertical well, the soakage time of drilling fluid in horizontal well is longer, the lost circulation and cave-in are more likely to happen. Therefore, SMWW of horizontal well should be calculated more precisely. This paper starts with an analysis of mud rheological property, combined with flow rate equations of different operating conditions, through math deduction for fluctuation pressure distribution model; a method of corrected SMWW calculating was established.


ASCE Subject Headings:
Mud
Wells
Drilling
Rheology