A Comparative Analysis of the Trouble Time for Conventional and Casing Drilling Wells: A Case Study on the Lobo Trend

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Author(s) Abubakar Mohammed | Ikebudu Abolle-Okoyeagu | Chika Judith Okeke
Pages 584-588
Volume 1
Issue 11
Date November, 2012
Keywords Casing drilling, Non Productive Time, Lobo Trend, Trouble Times
Abstract

Conventional drilling methods have caused the petroleum and gas industry a huge operational and financial challenges. The cost of purchasing, inspecting, handling and transporting the drill string are some of the major challenges. The tripping in-and-out of the drill string whenever the Bottom Hole Assembly (BHA) needs a replacement or when total depth is reached does not only contributes to the Non Productive Time (NPT), but also leads to well control difficulties including wellbore instability and lost circulation. The Trouble Time of wells constitutes the NPT of such wells and includes stuck pipe, lost circulation, well control, mud, cement, directional, mechanical and laydown 7”. On the average stuck pipe and lost circulation contributed up to about 74% of the NPT in the heavily faulted Lobo Field. Casing while Drilling (CwD) is an innovative technology to minimize the NPT of well. This process involves simultaneously drilling and casing a well by using the active casing. This paper presents a comparison between the conventional drilling and casing drilling methods applied in the Lobo trend of Webb and Zapata counties located in South Texas, United States of America.

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