Modeling of interactions between formation and downhole drilling tool with wearflat

Patent metadata

Field	Value
Publication number	US-10119337-B2
Application number	US-201415120080-A
Country	US
Kind code	B2
Filing date	Nov 20, 2014
Priority date	Nov 20, 2014
Publication date	Nov 6, 2018
Grant date	Nov 6, 2018

Abstract

A computer-implemented method of designing a downhole drilling tool may include generating a three dimensional (3D) downhole drilling tool model including a plurality of cutting elements on a plurality of blades and simulating engagement of the 3D downhole drilling tool model with a 3D model of a borehole bottom. The method may further include calculating a cutting force of a cutting element of the plurality of cutting elements, calculating a wearflat frictional force of the cutting element, and modeling a drilling efficiency of the 3D downhole drilling tool model based on the cutting force of the cutting element and the wearflat friction force of the cutting element. In addition, the method may include determining a design parameter of the 3D downhole drilling tool model based on the drilling efficiency of the 3D downhole drilling tool model.

First claim

What is claimed is:

1. A computer-implemented method of designing a downhole drilling tool, the method comprising:
generating a three dimensional (3D) downhole drilling tool model including a plurality of cutting elements on a plurality of blades;
simulating engagement of the 3D downhole drilling tool model with a 3D model of a borehole bottom;
calculating a cutting force of a cutting element of the plurality of cutting elements based on a comparison of a cutting energy associated with the cutting element and a failure energy of a volume of formation in the 3D model of the borehole bottom;
calculating a wearflat frictional force of the cutting element;
modeling a drilling efficiency of the 3D downhole drilling tool model based on the cutting force of the cutting element and the wearflat friction force of the cutting element;
determining a design parameter of the 3D downhole drilling tool model based on the drilling efficiency of the 3D downhole drilling tool model;
adjusting the 3D downhole drilling tool model based on the determined design parameter; and
manufacturing a drill bit based on the 3D downhole drilling tool model.

2. The method of claim 1 , further comprising calculating an interfacial friction force on a cutting face of the cutting element.

3. The method of claim 2 , further comprising modeling the drilling efficiency of the 3D downhole drilling tool model based further on the interfacial friction force.

4. The method of claim 1 , wherein calculating the cutting force comprises calculating a contact stress on a cutting face of the cutting element.

5. The method of claim 1 , wherein the failure energy is based on a strain energy of the volume of rock in the 3D model of the borehole bottom.

6. The method of claim 1 , further comprising determining a back-rake angle of the cutting element based on the drilling efficiency of the 3D downhole drilling tool model.

Assignees

• Halliburton Energy Services Inc

Inventors

• Ling Xianwu

Classifications

• E21B10/54

  the bit being of the rotary drag type, e.g. fork-type bits · CPC title

• G06F2111/10

  Numerical modelling · CPC title

• G06F2119/18

  Manufacturability analysis or optimisation for manufacturability · CPC title

• G06F30/00

  Computer-aided design [CAD] · CPC title

• G06G7/48

  Analogue computers for specific processes, systems or devices, e.g. simulators · CPC title