Successful primary cementing requires centering of the casing, casing movement, and a properly conditioned hole. Laxmi Scratchers condition the hole by removing mud cake from the face of formation to ensure a good cementing bound and to prevent channeling. They also contribute to the even distribution of the cement slurry and the achievement of a complete fill.
 

Specification of Reciprocating Scratchers :

These are constructed to withstand any treatment from the casing rack to the bottom of the well without impairing their effectiveness. The high strength wire fingers and cable loops distintegrate the toughest filter cake and their working diameter enables them to reach into enlarged scale sections to agitate gelled mud and to make possible a complete cement fill.


 

Specification of Rotating Scratchers :

These consists of a split collar which houses double coiled external and internal bristles. The external bristle system is inclined 200 and is shielded by slight elevations in the collar. The inclination of these bristles reduces the abrasive action when casing is run into the hole. The bristles are placed in a new position relative to the bore hole wall at each change of direction while moving pipe, thus assuring the cleaning of the entire circumference of the casing and the well bore.

The internal bristles serve to remove mill scale and other foreign matter from the casing, improving the bounding of cement to the casing.