Patent ID: 9423379
Filing Date: 2016-08-23
CPC Classification: E21B,G01N

Claim Text:
1. A method of determining a density of a cement slurry beneath a sea bed, the method including the steps of: pumping a cement slurry from a supply pipe into a cavity beneath the sea bed; providing a conducting unit of known acoustic impedance within the cavity, the conducting unit having a first side and a second side which are opposite each other; locating the conducting unit such that the second side is in contact with the cement slurry; moving the conducting unit relative to the cavity in conjunction with the pumping of the cement slurry into the cavity; providing an incident acoustic wave of known amplitude to the first side of the conducting unit; measuring an amplitude of a reflected wave at the first side of the conducting unit; calculating the acoustic impedance of the cement slurry based on the respective amplitudes of the incident and reflected waves; and calculating a density of the cement slurry based on the acoustic impedance of the cement slurry.