STUDY ON THE RHEOLOGICAL PROPERTIES OF A NOVEL DRILLING FLUID FOR THE PAY ZONES OF HIGH PRESSURE HIGH TEMPERATURE OIL-WELLS

Now-a-days, the exploitation activities have moved into the deeper oil and gas formations in hostile High Pressure High Temperature (HPHT) environment that demands state-of-the-art and sophisticated drilling fluids basically for the pay zones. Due to their high temperature instability, the simple polymer based mud systems are not suitable for the HPHT wells. The major challenges in HPHT conditions include low penetration rate, excessive torque and drag, poor hole cleaning, differential pipe sticking and formation damage. These complications can be controlled by maintaining proper rheological properties as well as filtration loss properties in the mud systems. But, it is very difficult to maintain these properties of conventional pay zone drilling fluids under HPHT conditions due to the presence of high molecular weight polymers in the mud. This work exhibits synthesize and evaluation of polymer nanocomposites as additives for a novel cost effective, efficient, environment friendly, and fit-for-thepurpose nanocomposite based Reservoir Drilling Fluid (RDF) system for the pay zones or reservoir sections of the HPHT wells.