BOTTOMHOLE GAS-SAND SEPARATOR Russian patent published in 2006 - IPC E21B43/38 

FIELD: mining, particularly for deep pumping operation, namely to operate wells adapted to produce methane from gas-bearing coal beds.

SUBSTANCE: device comprises body made as sub, as well as tail end and filter made as helical spring. One spring end is fixedly connected to the sub, another one is secured to tail end. Spring ends are arranged in internal cavities of sub and filter correspondingly. Device also has bush and guiding rod. Lower end of guiding rod is connected to tail end, upper one is fastened to bush. The bush may perform axial movement with respect to the sub. Device is also provided with separation unit, limiting finger and valve made as cylindrical float with needle. The separation unit is shaped as auger wound around hollow pipe provided with radial channels. Upper part of hollow pipe has seat. Separation unit is located in sub interior. Limiting finger is installed in hollow pipe interior over radial channel location area. The float is arranged inside hollow pipe and may perform axial displacement relatively the pipe to close the seat and to cooperate with limiting finger. Needle is coaxially installed on upper float end. Longitudinal grooves are made along the full spring strip length from overlapped spring coil side.

EFFECT: increased operational efficiency even in the case of high solved gas and solid impurities content in well fluid to be produced.

2 dwg