DEVICE FOR GRAVEL FILTER FORMING IN WELL Russian patent published in 2005 - IPC

FIELD: oil production industry.

SUBSTANCE: device comprises filter and pressing packer installed under the filter and supported by bottomhole. Packer body has supports for sealing member and is connected to filter through threaded clutch. Device also comprises cylindrical, tapered and collet bushings seriously installed on outer surface of packer body. Tapered bushing base faces upwards. Lower conical part of tapered bushing passes under upper part of collet bushing. Collet bushing is located in lower part of packer body and is used as lower support for sealing member. Formed on packer body are longitudinal slots for receiving rods. Rods are connected to lower part of cylindrical bushing by threaded connection. Shaped cuts are created in upper part of cylindrical bushing. Cylindrical bushing is secured relative packer by three rods spaced equal distances one from another. Collet bushing is fixed with fixing screw.

EFFECT: possibility to prevent mechanical impurities carry-over from bed, widened operational capabilities due to creating necessary conditions to perform geophysical investigations with the use of instruments lowering up to the well bottom, increased operational quality of the well with sealed annular space due to prevention of packer releasing, increased overhaul period due to increased gravel fill reliability, reduced labor intensity due to elimination of additional lifting and lowering operations.

3 cl, 1 dwg