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Impact occurs when two bodies collide, leading to the application of impulsive forces between them. Analyzing impact mechanics involves considering two colliding particles moving along a line known as the line of impact, which passes through their centers and is perpendicular to the contact plane.
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Study on Erosion by Built-In Pulse Impactor Based on Simulation.

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  • 1Drilling Engineering Research Institute, SINOPEC Xinan Oilfield Service Corporation, Sichuan, Deyang 618000, China.

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Summary
This summary is machine-generated.

This study simulates erosion in oil and gas drilling impactors using CFD. 40CrMo material offers the longest lifespan, and understanding fluid velocity and particle concentration is key to reducing erosion.

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Area of Science:

  • Mechanical Engineering
  • Materials Science
  • Fluid Dynamics

Background:

  • Built-in pulse impactors in oil and gas drilling face significant erosion, reducing drilling efficiency and component lifespan.
  • Erosion by drilling fluid and solid particles degrades critical components, necessitating improved material selection and design.

Purpose of the Study:

  • To simulate and analyze the erosion process in built-in pulse impactors using computational fluid dynamics (CFD).
  • To evaluate the erosion lifespan of different materials and identify key factors influencing erosion rates.
  • To provide insights for mitigating erosion and extending the service life of drilling impactors.

Main Methods:

  • Utilized computational fluid dynamics (CFD) with discrete phase model (DPM) and DPM erosion model.
  • Incorporated erosion theory into simulations of the impactor's rotating body, housing, and internal flow channels.
  • Simulated various boundary conditions, including drilling fluid velocity (27.558–32 m/s), particle diameter (0.074–0.11 mm), and concentration (0.2–0.6 kg/s).

Main Results:

  • Solid-phase particles cause more erosion than the liquid phase under high-pressure conditions.
  • Erosion damage concentrates at the flow channel outlet due to uneven particle distribution and accumulation.
  • 40CrMo demonstrated the longest erosion lifespan (525.47 h), surpassing 45 steel and Q235A.

Conclusions:

  • Material selection, particularly 40CrMo, significantly impacts erosion resistance.
  • Fluid velocity and particle concentration are critical factors that accelerate erosion rates.
  • Optimizing impactor design and operating parameters can mitigate erosion and enhance drilling tool longevity.