| 摘要 |
<p>Disclosed is a method and apparatus for determining the erosional characteristics of a mudcake on a wellbore wall. According to various embodiments of the invention, the method includes preparing a mudcake, forming a mudcake assemblage (122) comprising the prepared mudcake, a screen (124), and a filter paper, and submerging and securing the mudcake assemblage (122) in a container (110) filled with a fluid. The fluid includes one of a native fluid, such as fresh water or seawater, and a foreign fluid, such as a cleaning or wahing fluid or a spacer fluid, to the mudcake. The method further includes agitating the fluid for a plurality of time intervals, removing the mudcake assemblage (122) from the container (110) after expiration of each time interval, and drying the mudcake assemblage (122). Further, the method includes weighing the mudcake assemblage (122) to determine an interval weight for each time interval, and determining the erosional characteristics of the mudcake on the wellbore wall by graphically correlating the determined interval weights of the remaining mudcake in the mudcake assemblage (122) as a function of time. An erosion rate of the mudcake is defined by a slope of a tangent of an initial portion of the graphical correlation between the determine interval weights and cumulative time.</p> |
