Process and plug for well abandonment

Details Process and plug for well abandonment Process and plug for well abandonment

1995-03-21

1997-09-16

Neuder, William P.

Wells

Processes

Cementing, plugging or consolidating

126192, E21B 33138

Patent

active

056670109

ABSTRACT:
A plug and process for use in well abandonment is taught. The plug includes a retaining structure, such as a cement plug, which is placed in the well borehole and an amount of a viscous substance, such as sand and fines in bitumen, above the retaining structure. The viscous substance prevents the passage of fluids vertically through the well borehole. The plug remains viscous over time and can flow to fill void which may open up in the well adjacent the plug. To enhance the sealing characteristics of the plug, the process for placement of the plug includes the removal of a section of the well casing and possibly also the sheath and a layer of the borehole wall behind the removed section of the casing at the position of the plug to prevent the flow of fluids around the plug.

REFERENCES:
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patent: 2164266 (1939-06-01), Armentrout et al.
patent: 3901316 (1975-08-01), Knapp
patent: 3995694 (1976-12-01), Freiburger
patent: 4173999 (1979-11-01), Messenger
patent: 4736796 (1988-04-01), Arnall et al.
patent: 4842063 (1989-06-01), Coetzee et al.
patent: 4869323 (1989-09-01), Stags
patent: 4898242 (1990-02-01), Jennings, Jr. et al.
patent: 4909323 (1990-03-01), Hastings
patent: 4966237 (1990-10-01), Swanson et al.
patent: 5004298 (1991-04-01), Boulanger et al.
patent: 5105879 (1992-04-01), Ross
patent: 5159980 (1992-11-01), Onan et al.
patent: 5199489 (1993-04-01), Johnson et al.
patent: 5293939 (1994-03-01), Surles et al.
Canadian Association of Petroleum Producers brochure "Surface Abandoment and Reclamation in Alberta" date: Unknown.
Energy Resources Conservation Board "Well Abandonment Guide" first published Aug. '91, Revised Aug. '94.
Amoco Petroleum "Amoco Drilling Manual" pages describing abandoment plugs--date: Aug. 2, 1901.
"Gas Migration in Heavy Oil--Somehistory" J. Edson publication date: not known--first became aware of it Summer 1993.

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