Designed and used for removing filter cake from open hole section of a wellbore, also removing mud residue from the surface of casing. Additional aid in preparing wellbore for cement job which improves bonding of cement to formation. In washed out sections of a wellbore loop of cable removes gelled mud and aids in mud displacement by cement.
Typically run above weak formations, requiring protection from the pressure, generated by the cement column. Normally installed on the casing string above the weak formation, its design allows cement to flow in an upward direction, yet help to prevent it from falling downward.
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