10) Other family treatment system : the filter bed

The secondary treatment accomplished by the filtering mass must satisfy 3 objectives :

A gravel pack slurry containing gravel and a water-based carrier fluid is then introduced into the wellbore.

This process is described more specifically in fact sheet A23 "Filter bed purification.

Neither regular renewal filter layer nor biological sludge evacuation;

Their role is to supply oxygen to the filter bed and allow the fixing of micro-organisms.

There is further described a method and apparatus for monitoring the condition of a gravel pack disposed within an oil or gas well.

Once within the formation, forming a particulate pack, wherein the particulate pack is a gravel pack along a portion of the wellbore, a proppant pack within a portion of the subterranean formation, or both.

The sand filter retains the different shapes of the phosphor by adsorption and precipitation in the superficial horizon.

A surface layer of sludge is formed on the filtering mass which is degraded during the drying phases.

Treatment via "filtering mass" is a form of biological treatment of wastewater by bacteria for which the biotope is sand.

The water is then carried to the filtering mass by rigid or flexible drains and passes through a bed of washed limestone sand.

Methods and systems for deliquification of fluid loaded, packed wells with sub-surface safety valves ('SSSVs') utilizing timed and tailored chemical treatments.

Treatment via "filtering mass" is a form of biological treatment of wastewater by bacteria for which the biotope is sand.

The proppant materials are less susceptible to fouling by residual materials in the fracturing or gravel pack fluid and hence may have improved clean-up compared with conventional materials.