Patent ID: 7347259
Filing Date: 2008-03-25
Classification: E21B,F04F

Abstract:
1. A throat for a downhole tool, comprising: an entrance section having an opening tapered at a first angle; a barrel section adjacent the entrance section; a diffuser section, adjacent the barrel section, having a taper at a second angle, the entrance section, the barrel section, and the diffuser section having a central opening therethrough; and an insert within the throat having an inner diameter, the insert having a plurality of disks adjacent one another, each disk having an inner diameter defining the insert opening, the plurality of disks made of substantially pure diamond, brazed together to form the insert, the insert made of a hardened material to protect the throat from erosion as a fluid enters the tapered opening of the entrance section, passes through the insert and the barrel section to the diffuser section, and exiting the tapered diffuser section, wherein the insert is within the throat such that a first set of disks are within the barrel section, a second set of disks are within the diffuser section, and a third set of disks are within the entrance section.