Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Patent
1992-04-27
1994-05-03
Britts, Ramon S.
Boring or penetrating the earth
Enlargement of existing pilot throughbore requiring...
175 57, 175106, 175331, 166289, E21B 728
Patent
active
053078861
ABSTRACT:
Method for casing a hole drilled in a formation having an enlarged section located below a previously cased section. The method includes running casing into the enlarged section wherein the casing is of slightly smaller diameter than that present in the previously cased section, pumping cement into the annulus formed between the outer surface of the casing and the enlarged section of the formation, providing a valve arrangement in the casing to permit circulation of the cement between the annulus and an inner portion of the casing, securing the casing in position within the hole and hanging and packing off in the last casing string. Finally, the previously cased string is latched and sealed to the last casing string.
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Britts Ramon S.
Tsay Frank S.
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