Percussion drilling is a manual drilling technique that utilizes a robust cutting or hammering bit. This bit is securely attached to a rope or cable and is strategically lowered into an open hole or within a temporary casing. This drilling method, which is characterized by its reliance on gravity and striking, is commonly recognized in the industry as 'Cable tool.' It is often employed for various applications due to its effectiveness in penetrating different types of soil and rock formations.

Exploration drilling serves as the foundational phase of the drilling process, specifically designed to evaluate the physical characteristics and delineate the boundaries of a reservoir. This critical phase is essential for gathering accurate temperature measurements, which are necessary for understanding the thermal dynamics of the reservoir. Additionally, it involves the collection of rock samples, which provide valuable geological insights, well as the retrieval of fluid samples that are crucial for conducting thorough chemical analyses. Together, these activities contribute significantly to the comprehensive assessment of the reservoir's potential.