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EQUIPMENT AND MATERIALS
ArticleName Rock drillability and the most efficient drilling tool selection
DOI 10.17580/gzh.2018.12.12
ArticleAuthor Sinev S. V.
ArticleAuthorData

Drilleksp Small Research and Production Enterprise, Moscow, Russia:

S. V. Sinev, Leading Researcher, Candidate of Engineering Sciences, stanislav-vs@mail.ru

Abstract

The article discusses simplified generalizing characteristics of drilling such as drillability and drilling mode in the form of relationship between drilling penetration rate, drilling bit pressure and rotations per minute, which allow selecting drill bit and drilling parameters in case of significant headway per drill bit. When high-durability drill bits appeared, the drillability parameter has lost its significance in dividing a hole cross section into pads but remains important in drilling rate setting. Three ways of modeling, i.e. analytical, experimental and statistical are described. The experimental modeling is selected as handy and comprehensible method for drilling people, having advantages borrowed from the statistical modeling on a real-time basis, and implementable directly on a drilling rig. Separation of a drilling model in the form of the drilling penetration rate as function of drilling bit pressure into intervals by rock–bit interaction types and mechanisms of rock failure into volumetric, fatigue–volumetric and abrasion destruction is erroneous. Dependences of the drilling penetration rate on the drill bit pressure and rotations per minute are linear, and departure from linearity is conditioned by both bottomhole cleaning and, in a greater degree, by integration of drilling tool and hole wall interaction in the drilling process. Surveys of drilling models at the minimal headway of 200 mm are illustrated. These surveys are carried out at the beginning of drilling, in the time of drill changing and during connection with and without loss of time of drilling process. The model can be used to determine rock drillability to separate a hole cross section into pads. The primary purpose is to reveal technical-and-economic indexes of new equipment and tools, including drill bits. The drill bits efficiency of which has been estimated using the drilling models are presented. These drill bits have produced a 300 % increase in the drilling penetration rate as compared with the massproduced tools and enabled improving bit bearings by introduction of the second retaining drill bit bearing in the unloaded side of the tool with leaving a gap for sealing.

keywords Rocks, rolling cutter bit, micro-bits, drillability, drilling model, drill bit pressure, rotations per minute, bottomhole cleaning
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