Method of designing and optimizing fixed cutter drill bits using dynamic cutter velocity, displacement, forces and work
AssigneeSchlumberger Technology Corporation
InventorsAndrew Dow, Crystal Brown Mayer, Carlos Alberto Armada, Balasubramanian Durairajan
Life of this patent
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Abstract
A method includes simulating a cutting tool drilling an earth formation by incrementally rotating the cutting tool at a plurality of time intervals, determining a true trajectory of a cutting element disposed on the cutting tool for the duration of the plurality of time intervals, and determining a dynamic work profile for the cutting element based on the true trajectory and a force acting on the cutting element at each time interval.
Claims22
A method, comprising:
- simulating a cutting tool drilling an earth formation, comprising incrementally rotating the cutting tool at a plurality of time intervals;
- determining a trajectory of the cutting tool to model at least a portion of a section of a wellbore;
- determining a true trajectory of a cutting element disposed on the cutting tool for a duration of the plurality of time intervals, wherein determining the true trajectory of the cutting element is conducted separately from determining the trajectory of the cutting tool;
- and
- determining a dynamic work profile for the cutting element based on the true trajectory and a force acting on the cutting element at each time interval.
A method of designing a bottom hole assembly, comprising:
- simulating drilling an earth formation using the bottom hole assembly;
- determining one or more cutting elements subjected to cyclic loading, wherein determining the one or more cutting elements subjected to cyclic loading comprises:
- determining a force output on the one or more cutting elements;
- determining a true trajectory of the one or more cutting elements, wherein the true trajectory includes a cutter position, a cutter displacement, and a cutter velocity over a time period;
- and
- determining a dynamic work profile for the one or more cutting elements, wherein the dynamic work profile is determined using the true trajectory including the force output and the cutter displacement or the cutter velocity;
- altering at least one input parameter selected from a group consisting of cutting tool parameters, drilling operating parameters and bottom hole assembly parameters;
- and
- repeating simulating, determining and altering until a desired cutting tool design is reached having reduced cyclic loading, increased distribution of dynamic work profile, or any combination thereof.
A bottom hole assembly comprising:
- a cutting tool having a tool body;
- a first cutting element disposed on the tool body in a first region subjected to a first cyclic loading profile in a simulation of the bottom hole assembly, wherein the first region is proximate to a gage region of the cutting tool;
- and
- a second cutting element disposed on the tool body in a second region subjected to a second cyclic loading profile in the simulation of the bottom hole assembly, wherein the first cyclic loading profile has one or more of a greater average amplitude, a greater average frequency, and a greater average duration relative to the second cyclic loading profile, and the second region is proximate to a central axis of the cutting tool;
- the first cutting element having a greater impact resistance than the second cutting element, and the second cutting element having a greater wear resistance than the first cutting element.
Dependencies are inferred from the claim text.