Wells – Processes – Specific propping feature
Patent
1989-02-28
1990-01-16
Novosad, Stephen J.
Wells
Processes
Specific propping feature
166153, 166284, 166291, 166308, E21B 33138, E21B 3316, E21B 43267
Patent
active
048936766
ABSTRACT:
Subterranean oil and gas producing formations are fractured at vertically spaced intervals utilizing perforating guns forced down the well casing in tailing off "trains" comprising tamping and spacing water columns respectively positioned above and below each perforating gun, a perforation plugging slurry positioned below the spacing water column, and a concentrated proppant slurry column positioned below the perforation plugging slurry column. The perforation plugging and proppant slurry columns are sealed at their upper and lower ends by specially designed gel plug seals each comprising a short column of strong gel solution in which a spaced pair of casing size rock salt balls are disposed to provide the seal with structural reinforcement. As a tailing off train reaches a previous casing perforation zone, the concentrated proppant slurry flows outwardly through the perforations to prop the adjacent fracture zone, and the gel plug balls and the perforating slurry form a plug-off structure which seals the perforations, thereby automatically positioning the gun for a subsequent casing perforation shot. The guns and gel plug components of one or more gun and fluid column trains are stored in a vertically elongated well head lubricator pipe structure, and an associated fluid injection and displacement system is used to rapidly form each train and drive it down the casing. By adjusting the length of the spacing water column, the fracture spacing intervals may be easily varied.
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Hill Gilman A.
Novosad Stephen J.
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