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Centralizers have been used for decades to fulfill cementing
jobs. The optimum placement of Centralizers is achieved by balancing
between a high stand off ratio and low drag forces. Centralizers
are one of the major contributing factors in successful cementing
operations.
Centralizers are used to center the casing in the well bore
to guarantee good replacement of the mud by the cement. No well
is perfectly straight and this causes side forces which press
the casing against the bore hole wall. In inclined wells these
forces can be very high. The compensating force against the
side force has to be provided by the centralizer bows and is
termed as the restoring force which requires to be high to maintain
an annular clearance Stand Off.
Centralizer with a low starting force would appear to be desirable
for ease of running and pulling, the restoring force requirement
must also be considered. To help you achieve the proper balance
between the two requirements Casewell manufactures cantralizers
bow in a range of height and shape which exceeds the restoring
force required as those specified in API 10D spec. and also
limits the restoring force to a desirable force.
Load deflection curve is prepared to indicate the operators
on the performance of the centralizer ina given hole. This further
helps the operators to determine Centralizer spacing required
in deviated wells.
Casewell's software 'Centra
Case Soft' can be used to calculate the
Optimum spacing of Centralizers.
* For more technical information please contact us at sales@casewellservices.com
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