BOREHOLE CHAMBER Russian patent published in 2005 - IPC

FIELD: oil and gas production equipment, particularly for arranging different tools is borehole.

SUBSTANCE: chamber comprises body with directing nipple arranged in upper body part and pocket. Body is composed of bearing and guiding tubes connected one to another along interface line on outer surfaces thereof. Bearing tube has longitudinal orifice having one part mating guiding tube along side surface having longitudinal orifice. Connected bearing and guiding tubes form figure-eight defined by cross-sections along outer peripheries thereof. Pocket has outer diameter equal to that of guiding tube and connected to lower end thereof to close medium part of longitudinal orifice made in bearing tube. Pocket and bearing tube are connected one to another along longitudinal orifice. Outer surface of the pocket closing above orifice is coupled with inner surface of bearing tube so that round cross section is created. Inner diameter of bearing tube is equal to that of directing nipple. Inner diameter of bearing tube above pocket exceeds that of bearing tube in pocket installation area and is equal to outer diameter of directing nipple. Facet is made in transition area between larger inner diameter of bearing tube and lesser one and distance between lower point of directing nipple and the facet is equal to double length of guiding means for installing or removing borehole equipment in chamber pocket. Chamber is provided with upper and lower heads arranged from lower pocket end and upper guiding tube end and installed along longitudinal bearing tube orifice. The heads close upper and lower orifice parts correspondingly so that through channel is formed. The channel extends between bearing tube and inner pocket channel. Width of lower and upper head cavities is not less than the lesser diameter of inner pocket channel. Inner pocket channel has orifices made in pocket wall to communicate the pocket with hole clearance of the chamber.

EFFECT: increased operational reliability.

4 dwg