DEVICE FOR CLEANING HORIZONTAL WELLS Russian patent published in 2005 - IPC

FIELD: oil and gas extractive industry.

SUBSTANCE: device has serially connected, by tubing pipes, in upward direction, oval-shaped trap, check valve, connecting pipe, at least one drop valve and localizers placed on pipes. Between connecting pipe and drop valve an unloading valve is mounted. Above drop valve a preventing valve of plug type is placed. At mounting portion between unloading and preventing valves a hermetic working chamber is formed, filled with air at atmospheric pressure. Localizers are made in form of shells freely rotating on rolling bodies perpendicularly to pipes. In shells on axes, placed perpendicularly to longitudinal axis of device, freely rotating rollers are fixed. Check valve is made with possible opening and closing of pass aperture at its any position and is in form of two semi-circular spring-loaded plates, placed on common axis, and folding when pass aperture is opened. Trap has main axial input channel and input channels passing inside at angle 30, 60, 90 degrees to longitudinal axis of device, which are placed in levels along circle. Connecting pipe is made in form of replaceable bushings having different pass aperture diameters. Unloading channel is made in form plunger, fixed by shear pins in starting position in a cylinder, with solid axial channel, connected to hermetic working chamber. Said channel has output onto side plunger surface which output is sealed at starting position and is connected to lower inner space of device after destruction of shear pins and displacement of plunger to lower position, which occurs after unloading of device under effect from its weight and weight of support of tubing pipes during interaction with polluted well portion.

EFFECT: simplified operation.

8 cl, 2 dwg