Friction reduction optimization for extended reach and horizontal wells




Rostagno, Ian

Journal Title

Journal ISSN

Volume Title



With conventional oil and gas reservoirs declining, energy companies are constructing more complex wells to economically produce natural resources that were not accessible previously. Extended reach Offshore wells and horizontal unconventional land wells are just two examples of technologies developed to unlock challenging reserves. However, torque and drag in extended reach and horizontal wells with departures of ten thousand feet or more still constitute one of the main challenges and technical limitations for drilling. Offshore wells can experience high friction even with the use of rotary steerable systems. Additionally, directional land wells drilled with downhole steerable motor experience high friction because only the bit rotates while the rest of the string slides against the wellbore wall. This friction can produce complications such as low sliding and rotating rates of penetration, high tortuosity, poor hole cleaning, vibrations, premature downhole tools failure or bit damaging and connection back-offs. Additionally, it can stop the string from moving backwards or forwards and rotating, potentially ending up with an irreversibly stuck drillstring and a shorter-than-planned well. In this work, we try to understand the influence of different agents on friction behavior and mitigation in deviated and horizontal wells, and how these agents can be used most effectively while drilling to improve drilling performance and wellbore quality


LCSH Subject Headings