METHOD OF ISOLATION OF PRODUCING FORMATION OVERLAPPED BY FLOW STRING Russian patent published in 2000 - IPC

Abstract RU 2154150 C2

FIELD: oil-and-gas industry. SUBSTANCE: method is used in well abandonment on deposits whose hydrocarbon material contains high percentage of aggressive components. The method includes installation of cement bridging plugs. One cement bridging plug is installed in cap rock of well producing formation. Preliminarily, wellbore is freed from flow string and cement ring by milling within interval of installation of cement bridging plug. Cement ring is drilled and wellbore is expanded for 10-15 mm from initial size. EFFECT: higher reliability of producing formation isolation. 2 cl, 1 dwg

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RU 2 154 150 C2

Authors

Gorbunov A.N.

Tikhonov V.G.

Kamalov O.R.

Zhuravlev G.I.

Rylov E.N.

Dates

2000-08-10—Published

1998-06-15—Filed