Patent ID: 7926502

Claim:
An assembly for generating a low pressure region for detaching and removing residual drilling fluid solids from internal walls of an eductor, the assembly comprising: a. an eductor with internal walls, the eductor comprising: (i) a first induction port in fluid communication with a mixing chamber of the eductor for introducing a first dry component into the mixing chamber; (ii) a jet ring induction port in fluid communication with the mixing chamber; (iii) a liquid induction port in fluid communication with the mixing chamber for introducing a liquid into the mixing chamber; and (iv) an insert nozzle in fluid communication with the mixing chamber for receiving a first pressurized fluid, and for producing a first high velocity fluid stream for generating a first low pressure region within the mixing chamber, wherein the liquid and the first dry component mix within the mixing chamber in the first low pressure region; b. a jet ring adaptor removably connected to the eductor at the jet ring induction port, wherein the jet ring adaptor comprises: (i) a jet ring adaptor body; (ii) a jet ring outlet for providing an exit for residual drilling fluid solids; (iii) a pressure inlet for receiving a second pressurized fluid and flowing the second pressurized fluid to the jet ring adaptor body, thereby producing a second high velocity fluid stream for generating a second low pressure region within the eductor; and (iv) an annular nozzle disposed within the jet ring adaptor body forming a cavity within the jet ring adaptor body, thereby increasing a velocity of the second high velocity fluid stream, and decreasing a pressure of the second low pressure region within the eductor; and c. a diffuser section comprising a conduit removably connected to the mixing chamber and a diffuser insert disposed within the conduit, wherein the diffuser insert comprises: (i) a parabolic inlet with inlet converging smooth contours; (ii) a throat in fluid communication with the parabolic inlet; and (iii) a diffuser with extending sides, wherein the diffusing is in fluid communication with the throat, and wherein the second low pressure region within the eductor produces a suction that causes the residual drilling fluid solids to dislodge from the internal walls of the eductor, to flow into the jet ring adaptor, and to flow out of the jet ring outlet.