Overview

This document presents the drilling program design for the Dokety-1 (A4-1) well. This is a deviated exploration well in the Doba Basin, Chad, whose objective is to intersect 2 targets: Kedeni and Mangara, located at depths of 9576.44 ft and 9037.4 ft respectively. In order to carry out this study efficiently, Halliburton Landmark and E-RedBook drilling engineering software were used to design the drilling program. The work followed a precise design process: first we designed the drilling trajectory using COMPASSTM software, then the casing program was developed using StressCheckTM and CasingSeatTM software, taking into account all possible worst-case scenarios that could destabilize the casing, including water hammer for burst strength, and loss of drilling fluid for crush strength. This was followed by the design of the cementing program, drilling mud and drilling tool. Finally, a detailed estimate of drilling time and cost was made using WellCostTM software.

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