Optimization model for polycrystalline diamond compact bits based on reverse design

Zhijiu Ai,Yuchun Kuang,Mingming Zhang,Yuanji Wang,Yiwei Han

doi:10.1177/1687814018781494

Zhijiu Ai, Yuchun Kuang + Show 3 more

Open Access

https://doi.org/10.1177/1687814018781494

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Abstract

To improve the effectiveness and efficiency of bit cutter design, a new reverse design method is put forward based on the geometry of a polycrystalline diamond compact bit. The polycrystalline diamond compact bit design parameters (cutter parameters and polycrystalline diamond compact bit profile) are calculated based on the data obtained by three-dimensional scanning technology. The main calculation work is realized using MATLAB. Compared with using point cloud data, using the three-dimensional model based on calculated cutter parameters also provides accurate results. Then, the cutter parameters are optimized according to the minimum lateral force principle, minimizing the maximum wear rate principle. The lateral unbalance force of the bit decreases from 7.55%, for the original bit, to 3.17%, for the optimized bit, and the wear of the optimized drill bit is more uniform. The field data show that the optimization models create bits with a longer life and a higher rate of penetration.

Highlights

A polycrystalline diamond compact bit is referred to as a PDC bit
With the improvement of material technology and PDC bit design technology, PDC bits are increasingly applied in hard formation drilling
Where (Ri, ui, Zi) are reference point coordinates of cutter i in the cylindrical coordinate system, function L() is crown the curve equation calculated by the crown curve reverse method introduced in section ‘The model reconstruction of PDC cutters’, R0i is the initial positioning radius of cutter i, bi is the back rake angle of cutter i, b0i is the initial back rake angle of cutter i, e is the optimal interval of the back rake angle, dk, j is the distance between the j and j+1 cutters of blade k, Dk, j is the diameter of cutter j on blade k, n is the number of cutters, m is the number of blades and nk is the number of cutters on blade k

Summary

Introduction

A polycrystalline diamond compact bit is referred to as a PDC bit. The PDC cutters on a PDC bit are used to shear rock with a continuous rotary motion. With the improvement of material technology and PDC bit design technology, PDC bits are increasingly applied in hard formation drilling. Advances in Mechanical Engineering optimization of PDC bit cutter layout. Experience has shown that using a force-balance design method to lay out cutters can improve the performance of the drill bit. For a defective PDC bit, which cannot provide an ideal performance, the calculated design parameters should be optimized. The optimization model and reverse design of a PDC bit can improve the effectiveness and efficiency of PDC bit design. The reverse design of cutter parameters can detect machining errors of the drill bit. We use 3D scanning technology and the principle of PDC bit geometry to develop reverse design technology for PDC bit parameters and optimize the reverse parameters according to the design principle of the bit.

Results

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Conclusion