Inflatable borehole plug assemblies

Details Inflatable borehole plug assemblies Inflatable borehole plug assemblies

E - Fixed Constructions

21

B

E21B 33/126 (2006.01) E21B 33/127 (2006.01) F42D 1/18 (2006.01)

Patent

CA 2086161

The invention relates to inflatable borehole plug assemblies and to means to control the time required for their inflation. In particular the invention enables inflatable borehole plug assemblies to be lowered to a preselected depth in a borehole before inflation occurs. The inflatable borehole plug assemblies of the invention comprise a sealed gas- tight inflatable container (10) containing a pressurised vessel (2) having pressure releasing means (7). The pressurised vessel contains an inflating substance (4) and a tithe delay liquid (5), and is adapted so that on operation of the pressure releasing means (7): (i) the time delay liquid (4) is discharged from the pressurised vessel (2), thereby causing a time delay between the operation of the pressure releasing means (7) and release of the inflating substance (4) from the pressurised vessel (2), and (ii) after the time delay liquid (5) has been discharged the inflating substance (4) is discharged, thereby inflating the inflatable container (10) to form a borehole plug.

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