AN OVERVIEW OF OIL WELL DRILLING PROBLEMS IN SHALE FORMATIONS

Case Study: Asmari Reservoir

Abstract

Shale layers are found in 75% of the drilled sections in Iran, which causes 90% of the problems of instability of wells, and this can cause a number of problems, such as complete or partial collapse of the well or even loss of the well before it reaches its goal. On the other hand, the costs of instability can be reduced when drilling in shale formation using analytical and numerical methods considering the correct parameters. With the right understanding, we can help stabilize it. Preventing the problems caused by shale formations and resolving these problems requires an understanding of the features of the formation, familiarity with the changes caused by the physical and chemical interactions of the fluid, and awarness of the physiochemical properties of the drilling mud.