Abstract
The paper describes pellet impact drilling which could be used to increase the drilling speed and the rate of penetration when drilling hard rock for various purposes. Pellet impact drilling implies rock destruction by metal pellets with high kinetic energy in the immediate vicinity of the earth formation encountered. The pellets are circulated in the bottom hole by a high velocity fluid jet, which is the principle component of the ejector pellet impact drill bit. The paper presents the survey of methods ensuring an optimal off-bottom and a drill bit distance. The analysis of methods shows that the issue is topical and requires further research.
Highlights
The trend to drill hard rocks has intensified; new drilling methods are urgent to increase the drilling speed, as well as the rate of penetration
One of the most promising drilling methods is pellet impact drilling currently investigated by the Department of Well Drilling, Tomsk Polytechnic University
The pellets are circulated in the bottom hole by a high velocity fluid jet, which is the principle component of the ejector pellet impact drill bit
Summary
The trend to drill hard rocks has intensified; new drilling methods are urgent to increase the drilling speed, as well as the rate of penetration. According to the previous experiments and studies [1, 2, 3], the method ensures higher drilling speed, the rate of penetration, and speed per run. Ensuring an optimal off-bottom and drill bit distance is a complicated issue, which was first studied in the middle of the previous century. 2. Review and analysis of the methods ensuring an optimal off-bottom and a drill bit distance The first method suggested by A.B. Uvakov [1, 2] is based on calculating the average rate of penetration. Uvakov [1, 2] is based on calculating the average rate of penetration If it is known, the ejector pellet impact drill bit is run to bottom hole at estimated distance per equal period of time.
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