Patent ID: 9670749
Date: 2017-06-06
CPC Classifications: E21B

Claim:
1. A pump assembly for delivering mud and cement slurry to a borehole, said pump assembly comprising: a mud pump for delivering the mud to the borehole; a prime mover for driving said mud pump and mechanically coupled thereto; a cement pump comprising a plunger mechanism for delivering the cement slurry to the borehole; and a hydraulic coupling line connected to the mud pump on one end and the cement pump on the other end; wherein the hydraulic coupling line receives a pressurized fluid from the mud pump and delivers the pressurized fluid to the cement pump to act as a prime mover to reciprocate the plunger mechanism driving the cement pump, and wherein the mud is substantially isolated from the cement slurry in the pump assembly and in the borehole.