👉 Well fluid, also known as formation water, is a critical component in oil and gas reservoirs. It refers to the water that naturally occurs within the pores of reservoir rocks, often present before hydrocarbons are extracted. This water can be saline or freshwater and plays a significant role in reservoir management, as it can affect the mobility of oil and gas, influence well performance, and impact drilling operations. Proper management of well fluid is essential to prevent issues like water breakthrough, which can lead to reduced oil recovery and increased operational costs. Techniques such as water injection or gas injection are often employed to control the movement of this fluid and optimize reservoir productivity.