Portal de Periódicos da CAPES

ASYMMETRIC NOZZLE DESIGNS INCREASE PENETRATION RATE

1996; PennWell; Volume: 94; Issue: 28 Linguagem: Inglês

1944-9151

J.E. Akin, N. Roland Dove, Steven K. Smith,

Oil and Gas Production Techniques

Asymmetric nozzle designs can change drill bit hydraulics significantly, increasing penetration rates. The results for both polycrystalline diamond compact (PDC) bits and rock bits verify a significant increase in the rate of penetration (ROP) by simply changing to a new family of nozzle designs while holding other parameters constant. The Vortexx Group Inc. used a unique geometric transition shape and basic fluid mechanics concepts to develop a negative impingement pressure nozzle that increases turbulence. These patented nozzle designs produce regions of both positive and negative pressure on a surface when the fluid flowing through the nozzle impinges on the surface. Some of the early Vortexx nozzle designs were used successfully in the field where good offset data were available. These successes led to the improved nozzle designs that were then tested in typical drilling research facilities to determine which bit design parameters could be changed to take better advantage of the new hydraulics at the well bore face. The paper discusses the PDC lab tests, rock bit lab test, field test offset data, fluid mechanics, nozzle pressure tests, CFD studies, and results.