«Onshore and offshore oil and gas well construction»

Development of the concept of a continuous action diverter for drilling wells by a core barrel with a removable core receiver (RCR)

UDC: 622.24
DOI: 10.33285/0130-3872-2023-9(369)-25-31

Authors:

¹ St. Petersburg Mining University, St. Petersburg, Russia
² Geological Center of St. Petersburg State University, St. Petersburg, Russia

Keywords: removable core receiver (RCR), diverter, exploration drilling, curvature intensity, screw downhole motor, wellbore curvature technology

Annotation:

The development of exploration drilling for solid minerals has shifted the construction of vertical wells to the background, making it necessary to drill deviated, directional and multilateral wells. The transition of drilling companies to core barrels with a removable core receiver has limited the use of previously developed continuous deflectors due to the degree of curvature they implement. There exists a technology for a wellbore deviation using a screw downhole motor, but at this stage, downhole machines manufactured in Russia do not provide the required parameters for productive core drilling by diamond tools. To ensure highly efficient construction of deviated exploratory wellbores, the industry requires a stable working tool that realizes the design degree of curvature with a minimum number of auxiliary operations and additional tools. In this regard, the article proposes a modification of a continuous diverterdesign based on OBS-76. By changing the diverter assembly, it becomes possible to use the diverter to carry out the curvature of the wellbore with the degree of curvature acceptable for the NQ drill string.

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