Wells – Processes – Graveling or filter forming
Patent
1991-12-11
1993-10-19
Suchfield, George A.
Wells
Processes
Graveling or filter forming
166 51, 175267, E21B 720, E21B 1032, E21B 1034, E21B 4304
Patent
active
052537080
ABSTRACT:
A process for installing a gravel pack within an unconsolidated hydrocarbonaceous fluid-bearing formation. The process includes the steps of: drilling a bore hole to a first pre-determined depth; installing a well casing in the bore hole; lowering on a pipe string through the bore hole an apparatus for drilling and installing a slotted liner for gravel packing, the apparatus including a drill bit for drilling a pilot hole, means for enlarging the pilot hole to a diameter larger than the internal diameter of the well casing, the pilot hole enlarging means being initially retracted and located within a housing above the pilot hole drill bit, a slotted liner having a first end and a second end, the first end integrally joined to the apparatus above the housing and a drive assembly integrally joined to the second end of the slotted liner; rotating the apparatus to drill a pilot hole through the hydrocarbonaceous fluid producing zone; expanding the initially retracted pilot hole enlarging means upon exceeding the first pre-determined depth; enlarging the pilot hole to a diameter larger than the internal diameter of the well casing; continuing until the first end of the slotted liner reaches a second pre-determined depth depth; injecting a highly viscous fluid to maintain the diameter of the enlarged hole; installing a gravel pack tool assembly; and injecting a gravel slurry into an annulus defined by the enlarged hole and slotted liner to gravel pack the annulus.
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Foam Gravel Packing pp. 10-13 SPE Production Engineering Feb. 1990.
Hager Jr. George W.
McKillop Alexander J.
Mlotkowski Michael J.
Mobil Oil Corporation
Suchfield George A.
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