Research Institute of Petroleum Industry

Description:

Due to their higher pore pressures, formations above and below these producing zones need to be stabilized by fluids with higher density. However, an exposure of a depleted zone to the required high-density fluid can cause a significant loss of the whole fluid and differential sticking. Furthermore, uncontrollable drilling fluid losses are at times unavoidable in the large fractures of these formations. So it is difficult to drill such zones economically and safely by means of conventional rig equipments. Underbalanced drilling may be an alternative, but the extra time and equipments can greatly increase the cost of the operation. Recently, a new drilling fluid technology has been developed in an attempt to eliminate just these discussed problems. This novel technology is based on aphrons uniquely structured micro-bubbles of air. The air used to generate aphrons is usually incorporated into the fluid with conventional fluid-mixing equipment at ambient pressure, thereby reducing costs and safety concerns associated with conventional air and foam drilling operations. In this project, it is presented the design and properties of aphron drilling fluids, and discuss how the fluid characteristics work together to provide superior performance in drilling operations that have a high risk of lost circulation.

 

Application:

·   

·     Drilling low-pressure/low-fracture-gradient sections

·     Drilling fractured and highly permeable sections

·     Reservoir drill-in applications

·     Drilling normal and low-pressure sections (high density applications)

 

Achievements:

·     Designing of aphron-based drilling fluid formulations containing surfactants, polymers and nano-additives

·     Reducing mud loss circulation into formation in low-pressure reservoirs

·     Improving of the aphron-based drilling fluid stability by using the nano-additives

·     Reduce the possibility of damage to the formation and simultaneous removal of H2S in the well using this type of fluid

 

Special product:

NANO-Enhanced Aphron based Drilling Fluid

RIPI's N-EADF

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