away from the walls and toward the center of the flow path the abrasive material entrained in the well fluid is believed to flow along the surface of the plug and through the orifice defined between the plug and the seat without mixing back in the choke body the impingement of abrasive materials on choke components occurs to the greatest extent on the extended surface of the plug neck and the inner surface of the seat which forms the narrowest flow restriction in the annular orifice at the truncated end of the plug the entrained materials are drawn toward the center of the flow where a vortex of a mild turbulence is set up because of the centralized nature of this mild turbulence and very little recirculation of well fluid the entrained abrasive materials do not scour the surface of the choke discharge section further it has been found that chokes according to the present invention not only experience surprisingly little internal wear in abrasive flows but that their unique design reduces abrasive wear on well equipment downstream of the chokes themselves the flow patterns established for abrasive materials entrained in well fluids flowing through adjustable chokes in accordance with the present invention combine with the compound angled design of the plug and seat to produce outstanding and unexpected results as compared to previously known chokes an additional benefit realized from the present invention is a reduction of noise and vibration normally associated with adjustable chokes the turbulence in the directed flow of well fluid being small in magnitude produces little vibration in the choke body.