SLURRY EROSION BEHAVIORS OF COPPER ALLOY BARREL OF MEASURE-MENT WHILE DRILLING

Kang Jin Huang,Igor V Alexandrov,Qing Bo Du,Kun Xia Wei,Wei Wei,Ke Zhang

doi:10.36547/ams.27.1.851

Abstract

Measurement while drilling (MWD) has been widely used in petroleum drilling engineering because it can realize borehole trajectory monitoring and improve the drilling speed. However, the slurry erosion will deteriorate and shorten the life of MWD. A user-defined function (UDF) code was developed to calculate the particle properties (particle impact velocity, particle impact angle and particle impact number) and erosion depth to understand the erosion process. The results show that the Realizable κ-ε model can accurately predict the erosion profile and the erosion depth is consistent with the experiment results. Furthermore, high pressure will aggravate surface damage and expand the area of slurry erosion. It has been demonstrated that computational fluid dynamics (CFD) and experimental approach can be used to identify and explain the erosion mechanisms in different regions where the surface morphologies reveal four erosion patterns, namely, micro-cutting, cracks, pits and plastic deformation.

Highlights

Measurement while drilling (MWD) is a kind of advanced drilling equipment, which has been widely applied because it can realize well trajectory monitoring and improve the drilling efficiency
In order to ensure the safe operation of MWD instrument and reduce the damage caused by the slurry erosion, an accurate erosion prediction is prerequisite
In comparison with the experimental data, the erosion depth and erosion profile predicted by the SST κ-ω model and RSM model are not as good as that by Realizable κ-ε model in Fig. 5(a) and Fig. 6

Summary

Introduction

Measurement while drilling (MWD) is a kind of advanced drilling equipment, which has been widely applied because it can realize well trajectory monitoring and improve the drilling efficiency. Three turbulence models of Realizable κ-ε, SST κ-ω and RSM are used to analyze the erosion rate of MWD barrel [30].

Results

Conclusion