«Onshore and offshore oil and gas well construction»

Experimental studies of the process of bottomhole annular coolant circulation formation

UDC: 622.24.085
DOI: -

Authors:

¹ St. Petersburg Mining University, St. Petersburg, Russia

Keywords: thermohydraulic drilling reamer, bottomhole annular circulation, ice drilling, swirling coolant flow, experiments

Annotation:

A methodology has been developed for experimental studying the process of formation of coolant bottomhole annular circulation. An experimental stand was designed and assembled, simulating the operating conditions of a thermohydraulic drilling reamer on a load-carrying cable in a well and allowing visual tracing of the processes being studied. The process of formation of the coolant bottomhole annular circulation was studied at an experimental stand at Vostok station in Antarctica, resulting in the possibility of establishing the conditions for the annular circulation formation, visualtracing the jet movement and propagation, determining the speed of the submerged jet outflow into a moving homogeneous medium and the rotation frequency of the bottomhole annular circulation. It has also been revealed that increasing the speed of jet outflow from hydraulic channels increases the efficiency of bottomhole annular circulation by increasing the ratio of the swirling fluid flowlinear speed to the speed of the jet outflow from hydraulic channels.

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