A low viscosity fluid for reducing fluid loss in a relatively low permeability formation has a viscosity of less that 10 CP and contains a low molecular weight viscosifying agent The aqueous medium may be fresh water, salt water, brine or slickwater. To improve the spring constant of the damping element, the damping element has an, upper group of damping bodies and a lower group of damping bodies, each having a substantial U-shaped cross section. The sorted information is then utilized by a threshold calculation module of the time bucketing data collection module to calculate a baseline value, defining a normal operating range for a performance parameter, for the time interval. The safety shield control mechanism, located in the main housing and removably engaged with the inner cannula, allows for positive and easily verifiable engagement and disengagement of the inner cannula as a safety shield for the obturator knife.