METHOD OF CLEANING PIPELINE (VERSIONS) AND DEVICE THEREFOR Russian patent published in 2016 - IPC B08B9/43 E21B37/02 

FIELD: oil and gas industry.

SUBSTANCE: group of inventions relates to cleaning pipeline inner surface of various deposits using coil tubing unit. When cleaning pipeline, coiled tubing with equipment system is placed over section of pipeline. Pit is formed and pipeline section is removed. Valve and T-joint are placed at end of pipeline. Working end of inserted long pipe BDT is connected to a cleaning device, which consists of two-stage sludge collector D and crowns. Device is introduced into guide tube NT, made in form of an arc with central angle of 90°. Upper end NT is connected with injector and lower - with T-joint. T-branch by means of flow line is connected to receiving tank, installed on surface. Valve and liquid is supplied at BDT with simultaneous movement of device on NT to destruction of deposits in pipeline. Destruction of deposits and carryover of slurry in D is performed by means of bit. Bit has internal conical recess at forming of which there are cutting straight wear resistant insertions and arranged in symmetry about device axis parallel to through holes. Through holes are made with expansion to inner surface of bit and formation of hydraulic connection of axial channel of device with an internal cavity D. One of stages D is fixed sludge collector, and other is centrifugal separator. Controlled pressure supplied liquid, and suddenly increase fluid supply is stopped. Said device is returned to NT. Valve is closed and lower end of disconnected NT of T-joint. NT is lifted with sludge is removed from D. Lower end of NT is connected with device to T-joint and valve is opened. Cycle of operations is carried out many times until pipeline cleaning is complete. Method includes dismantling equipment and pipeline and trench is filled.

EFFECT: higher efficiency of pipeline cleaning.

3 cl, 3 dwg