University of Minnesota

Other

Commonwealth Scientific and Industrial Research Organisation

Emmanuel Detournay

Alexei Alexandrovich Savitski

Jose Ignacio Adachi

Dmitriy Igor Garagash

Ganesh Ramakrishnan

Andrew Drescher

Kaixiao Tian

David A Hultman

Systems, methods, and computer-readable media are provided for simulating the coupled axial/torsional dynamics of drilling systems. An example method can include calculating a profile of a bit including cutters, the profile including a cutter layout representing cutter faces of the cutters; based on the profile of the bit, determining cutter interactions between cutters, a cutter interaction being determined when at least two cutters interact with a same surface portion; approximating a cutter geometry of each cutter using polygon approximation; based on the cutter interactions and approximated cutter geometry of each cutter, calculating an engagement surface for each cutter using polygon approximation; and based on geometric parameters associated with the engagement surface for each cutter, simulating reaction forces on the bit at a plurality of time steps corresponding to constant increments of an angular position of the bit during each revolution of the bit, the reaction forces including weight-on-bit and torque-on-bit.

Fast algorithm to simulate the response of PDC bits

A method of predicting a well trajectory wherein the method utilises a series of parameters to calculate the trajectory. The method is characterised in that the parameters include the angle of a drill bit () relative to a well bore (), and the variation of said angle during drilling wherein the variation of said angle is related to the moment on the bit ().

Method and apparatus for modelling the interaction of a drill bit with the earth formation

Solutions for the propagation of a hydraulic fracture in a permeable elastic rock and driven by injection of a Newtonian fluid. Through scaling, the dependence of the solution on the problem parameters is reduced to a small number of dimensionless parameters.

Interpretation and design of hydraulic fracturing treatments

A portable frame that includes a movable support for supporting a cutting tool used for engaging a rock sample, and upon relative movement between the rock sample and the cutter, the cutter will make a constant depth cut at a constant velocity. During the cut, the forces parallel to the direction of displacement and perpendicular to the direction are measured, and both cohesion and internal friction angle, which are parameters characterizing the rock strength, the internal friction angle, which is a true measure of the rock strength, can be determined.

Growing community of inventors

Roseville, MN, United States of America

Emmanuel Detournay