There may be cost or other limitations on the use of coiled tubing. Polymer breaking enzymes are effective at degrading polymer residues present in the wellbore but will not attack carbonate or other acid soluble materials so may leave damage behind. Cleansorb has now developed its patented Arcasolve acidizing process as the basis for the highly efficient treatment of drilling fluid damage. The use of Arcasolve for damage removal solves a number of problems inherent in conventional processes . Arcasolve fluid, which is initially non-reactive, can be placed in the wellbore via the drillstring during completion.
Acetic acid is produced following placement of the fluid.
This is an ideal pH for the effective operation of any polymer degrading enzymes which may be incorporated into the Arcasolve. Arcasolve can in many cases achieve highly effective removal of filter cake by itself due to the effective delivery of acid along the whole of the wellbore. In other cases, the incorporation of enzyme breakers into the Arcasolve formulation may be beneficial. The filter cake significantly reduces the permeability. In the diagram below, a cross section of the filter cake is shown.