Casing while Drilling (CwD) is an efficient drilling technology which is used in mitigating hazardous zones in a single trip with minimal connections. CWD applications have been known to increase the fracture gradient in narrow pore-fracture pressure window and deepwater drilling. It uses the plastering effect theory by plastering cuttings to the wellbore wall, which increases the wellbore's hoop stress by caging the created fractures. The purpose of this work is study the effects downhole fluid cuttings and bridging solids on wellbore strengthening in CwD applications. In studying the particle size distribution (PSD) of the downhole fluid in CwD applications, it's observed that fine cuttings are generated and these fall into the size ranges of bridging solids and loss circulation materials (LCM). In order to satisfy the industry demand for quantifying the process, a carefully designed PSD of bridging solids (LCM) and CwD cuttings was considered in this work. This technique was observed achieved fluid loss reduction by forming thin and low permeability external and internal mud cakes. High Pressure and High Temperature (HPHT) filtration tests were conducted at various time steps. Empirical model was used to calculate time dependent filter cake permeability and the results matched the expected outcome. Scanning electron microscope (SEM) and elemental mapping on filter disks presents expected trend of particle invasion with depth and time as well as formation of low permeability internal filter cake.
|School:||University of Louisiana at Lafayette|
|School Location:||United States -- Louisiana|
|Source:||MAI 54/06M(E), Masters Abstracts International|
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