Method of construction of multiple-string wells
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United States of America Patent
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-
Dec 11, 1990
Grant Date -
N/A
app pub date -
Sep 20, 1989
filing date -
Jan 21, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
The method of well construction includes the steps of drilling the rock and consolidating it with a conductor casing, a surface casing string and a flow string, and isolating the troublesome zones of the well with profile pipes being reamed in the course of their setting. The reaming of the profile pipes is effected by building up a pressure drop across them and subsequently expanding them. The drilling of the rock after the casing-in of the well with the conductor casing and the surface casing string is preformed with a bit of one and the same diameter, with the troublesome zones being reamed to a diameter equalling the outer diameter of the reamed profile pipes which are successively set in all the troublesome zones of the well as they are exposed by the drilling.
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