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Circulation System for Cooling FMIS

IP.com Disclosure Number: IPCOM000237676D
Publication Date: 2014-Jul-02
Document File: 2 page(s) / 288K

Publishing Venue

The IP.com Prior Art Database

Abstract

This invention is for a cooling system for CBM systems that are required to run below the perforations. The traditional recirculation system is too expensive for the CMB market. Thus this invention of the circulation system allows for the motor to be cooled without using a shroud or a traditional recirculation system. As described, this system would be built into the FMIS motor and would be very inexpensive to provide. This system could also be used in wells that do not have physical space for a traditional recirculation system. Because there would be only one circulation impeller the frictional drag of the circulation flow path would be critical. The sketch shows simply a length of channel welded to the seal housing section and ends at the stator housing upset. There would be two rods running the length of the stator that would provide a path circulation fluid to make it to the bottom of the motor. Alternatively the channel could also be made to end below the motor. In expansion technology usually (short, threaded) seamless tubes are used for several reasons. One reason is that longitudinally welded tubes (like Coil tubing) may have a weld bead at the tube ID (attachment, Fig.1). Such bead however could cause high local contact stresses during cone expansion (contact stress between cone-OD and tube-ID, typically using a perfectly round cone) as well as some kind of out-of-roundness after expansion. A way of overcoming such problems shall be presented here. The width of a weld bead is only relatively small. A small groove or recess in the cone OD (still large enough to cover the complete bead area including tolerances) would avoid contact with the weld bead (attachment, Fig.2 & 3). Since such recess is small the remaining contact area is supposed to be large enough to take the expansion loads. Moreover roundness after expansion will hardly be affected (or could even be compensated by a non-perfectly round cone). Obviously orientation of such a cone is required. In case of round-to-round expansion this usually is not required and would require some additional effort. However in case of folded tubes (and the idea came into mind particularly for such applications) the cone has to be oriented anyway (cone has to be designed in order to fit into the folded shape and to most smoothly unfold and expand – see attachment, Fig.4 & 5).The folded profile again has to be oriented with respect to the position of the weld (i.e. the weld is placed at a certain position of the folded tube where stresses and strain during unfolding are rather low). Such positioning should not cause any additional efforts during manufacturing of such a folded tube.

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Circulation System for Cooling FMIS

This invention is for a cooling system for CBM systems that are required to run below the perforations. The traditional recirculation system is too expensive for the CMB market. Thus this invention of the circulation system allows for the motor to be cooled without using a shroud or a traditional recirculation system. As described, this system would be built into the FMIS motor and would be very inexpensive to provide. This system could also be used in wells that do not have physical space for a traditional recirculation system. Because there would be only one circulation impeller the frictional drag of the circulation flow path would be critical. The sketch shows simply a length of channel welded to the seal housing section and ends at the stator housing upset. There would be two rods running the length of the stator that would provide a path circulation fluid to make it to the bottom of the motor. Alternatively the channel could also be made to end below the motor.

DETAILED DESCRIPTION OF THE INVENTION(S)

In expansion technology usually (short, threaded) seamless tubes are used for several reasons. One reason is that longitudinally welded tubes (like Coil tubing) may have a weld bead at the tube ID (attachment, Fig.1). Such bead however could cause high local contact stresses during cone expansion (contact stress between cone-OD and tube-ID, typically using a perfectly round cone) as well as some kind of out-of-roundness after expansion....