Wells – Processes – Cementing – plugging or consolidating
Patent
1997-10-14
1998-12-01
Suchfield, George A.
Wells
Processes
Cementing, plugging or consolidating
1662416, 1662421, 166292, 175 72, E21B 1710, E21B 33138
Patent
active
058425187
ABSTRACT:
A fiber reinforced cement lining for an unconsolidated or otherwise problematic zone in a wellbore is built up by first under-reaming the section of the wellbore to be stabilized by the cement lining. Next a drillable metallic liner is centralized in the under-reamed section and the annulus formed between the metal liner and the wellbore wall is filled with the fiber cement. After the cement has hardened, the drillable liner and a portion of its surrounding cement are milled out using the drillable liner as a guide for a piloted mill tool, thus leaving a relatively uniform thick-walled cement sheath bridging the zone to be stabilized in the wellbore while restoring the original diameter of the wellbore through the unconsolidated zone.
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J.P.M. van Vliet et al "Development and Field Use of Fibre-Containing Cement." Offshore Technology Conference, 27th Annual Conference, Houston TX 1995 discloses a soft centered cement plug as a guide for a pilot mill for drilling out part of a fibre cement layer to leave a relatively thin cement lining at a desired location in a borehole.
Omsberg Norman Paul
Soybel Joshua Richard
Bogatie George E.
Suchfield George A.
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