Numerical Modeling, Simulation and Lab Testing of Foam-Assisted Mud Cap Drilling Processes Dealing with Non-Newtonian Foam Rheology
- Yanfang Wang (Louisiana State University) | Caitlyn Thiberville (Louisiana State University) | Seung Kam (Louisiana State University)
- Document ID
- Society of Petroleum Engineers
- SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference and Exhibition, 29-30 October, Denver, Colorado, USA
- Publication Date
- Document Type
- Conference Paper
- 2020. SPE/IADC Managed Pressure Drilling and Underbalanced Operations Conference and Exhibition
- 2.1.3 Completion Equipment, 1.7 Pressure Management, 1.6 Drilling Operations, 1.7.5 Well Control, 5.5 Reservoir Simulation, 5 Reservoir Desciption & Dynamics, 6.3 Safety, 3 Production and Well Operations
- MPD/UBO for Unconventionals, Drilling in Depleted Reservoirs
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- 13 since 2007
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When drilling challenging formations such as very thick highly fractured sour reservoirs or carbonate/karst formations, a lost-circulation zone can be encountered. This causes mud to be lost and gas kick to take place, making the drilling process uncontrollable. Blocking or plugging wide fractures is impossible in many cases, which results in severe safety issues associated with toxic gases.
This study investigates an application of mud cap drilling by injecting foam mixture into the annulus for well control in such harsh conditions. An annular fluid column with foam mixture can be used to prevent kicks and push the toxic gas back into the formation down along the annulus. This foam-assisted mud cap drilling process has been proved to reduce non-productive time and fluid expenses.
This study presents how to model and simulate the process with accurate foam characteristics when foams are used to suppress gas kicks under certain well and fluid conditions. More specifically, this study deals with three scenarios: Base Scenario with a relatively short response time such that the injected foams do not contact the formation gas, and Scenario 1 and 2 with a relatively long response time such that the injected foams interact with the gas, with and without foam coalescence respectively, at the foam/gas interface. The results show how mud-cap drilling parameters (such as pressure, foam density (or, equivalent mud weight), foam velocity, and foam quality) change at different operating conditions and scenarios. Non-Newtonian foam rheology, depending on bubble size and bubble size distribution as modeled by Wang et al. (2017), lies at the heart of this simulation study.
|File Size||17 MB||Number of Pages||28|
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