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Stick-slip en forage pétrolier
Dynamics of a drilling structure is studied in torsion. Torsional instabilities, also known as stick-slip, are often present during drilling and reduce strongly the system efficiency. Measurements of bit parameters are obtained with an instrumented bit. Two types of behaviour are experimentally highlighted, comforted by a beam model. In the first one (stationary or desired functioning), the system is linear and modal analysis allows to understand the phenomenology. A perturbation of structural parameters (generally, operating parameters) makes converge the system on a periodical attractor, characteristic of stick-slip. In fact, a punctual non linearity appears in the second stage, justified by rock-bit interaction considerations. This bifurcation is theoretically described with linearized analysis and is experimentally exhibited.
Stick-slip en forage pétrolier
Dynamics of a drilling structure is studied in torsion. Torsional instabilities, also known as stick-slip, are often present during drilling and reduce strongly the system efficiency. Measurements of bit parameters are obtained with an instrumented bit. Two types of behaviour are experimentally highlighted, comforted by a beam model. In the first one (stationary or desired functioning), the system is linear and modal analysis allows to understand the phenomenology. A perturbation of structural parameters (generally, operating parameters) makes converge the system on a periodical attractor, characteristic of stick-slip. In fact, a punctual non linearity appears in the second stage, justified by rock-bit interaction considerations. This bifurcation is theoretically described with linearized analysis and is experimentally exhibited.
Stick-slip en forage pétrolier
Challamel, Noël (author) / Sellami, Hédi (author) / Gossuin, Luc (author)
Revue Française de Génie Civil ; 4 ; 733-752
2000-01-01
20 pages
Article (Journal)
Electronic Resource
Unknown
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