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Research Papers: Petroleum Wells-Drilling/Production/Construction

Implementation of a Bottom-Hole Assembly Program

[+] Author and Article Information
Kenneth Bhalla

 Stress Engineering Services, Inc., 13800 Westfair East Drive, Houston, TX 77041kenneth.bhalla@stress.com

Lixin Gong

 Stress Engineering Services, Inc., 13800 Westfair East Drive, Houston, TX 77041lixin.gong@stress.com

George K. McKown

 Smith International, Inc., 16740 Hardy Street, Houston, TX 77032amckown@smith.com

J. Energy Resour. Technol 130(4), 043101 (Nov 06, 2008) (6 pages) doi:10.1115/1.3000123 History: Received June 12, 2008; Revised August 30, 2008; Published November 06, 2008

A state of the art graphical user interface program has been developed to predict and design the bottom-hole assembly (BHA) performance for drilling. The techniques and algorithms developed in the program are based on those developed by Lubinski and Williamson. The BHA program facilitates conducting parametric studies and making field decisions for optimal BHA performance. The input parameters may include formation class, dip angle, hole size, drill collar size, number of stabilizers, and stabilizer spacing. The program takes into consideration bit-formation characteristics and interaction, drilling fluid weight, drill collar sizes, square collars, shock absorbers, measurement while drilling tools, reamer tools, directional tools, rotary steerable systems, etc. The output may consist of hole curvature (buildup or drop rate), hole angle, and weight on bit and is presented in drilling semantics. Additionally, the program can perform mechanical analyses and can solve for the bending moments and reaction forces. Moreover, the program has the capability to predict the wellpath using a drill ahead algorithm. The program consists of a mathematical model that makes assumptions of 2D, static, and constant hole curvature, resulting in a robust computationally efficient tool that produces rapid reliable results.

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Copyright © 2008 by American Society of Mechanical Engineers
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References

Figures

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Out of hole solution

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Figure 3

Deflection of elastic line of BHA–case 1 (Problem 1)

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Deflection of elastic line of BHA–Case 1 (Problem 2)

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Case 2—unstable and stable equilibriums

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Element size variation

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Multiple solution cases

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Figure 8

Main input screen

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Figure 9

BHA definition screen

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Figure 10

Calculation module screen

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Figure 11

Summary report screen

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Figure 12

Detailed output report screens

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