ABSTRACT

: This paper presents a rock/bit interaction model as well as its implementation in the dynamic simulation of drilling operation using rotary tri-cone bit. The new rock/bit interaction model assumes, firstly, at any instant during drilling operation the rock material fractures under a complex stress field created by the teeth attacking (touching) the rock surface; Secondly, the process for each tooth to attack the rock surface (cratering) can be divided into four stages: (a) initial contact, (b) indentation, (c) scraping or gouging, and (d) departure; And thirdly, the loading history may also be responsible for development of rock fracturing process. The modeling concept was implemented to simulate a cutting process in a toothed-ring cutting experiment. The results showed the dynamic simulation based on the new rock/bit interaction model provided an efficient way for numerical modeling of rotary drilling operations.

Keywords:
bit design, stress intensity factor, bit selection, drillstring design, hydraulic fracturing, Simulation, rotary drilling process, finite element model, Upstream Oil & Gas, rock surface
Subjects:
Drillstring Design, Drill Bits, Drilling Operations, Hydraulic Fracturing, Torque and drag analysis, Bit design
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2001. Swets & Zeitlinger Lisse, Permission to Distribute - American Rock Mechanics Association
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