WELL REPAIR METHOD Russian patent published in 2014 - IPC F16L1/24 F16L55/175 

FIELD: oil and gas industry.

SUBSTANCE: method includes installation on the damaged pipe section of a cylindrical coupling having at least one input tube and at least one output tube forming an annular gap between the inner surface of the coupling and outer surface of the pipeline, sealing of the coupling faces at the pipeline and delivery of composite material into the above annular gap through the input tube of the coupling until it appears in the output tube of the coupling. At that before installation of the coupling its inner surface and the surface of the damaged pipeline section are subject to shot blasting. The coupling is installed so that it forms the annular gap with a size of 6-40 mm. Shot blasting is made by abrasive material with particle size of 0.5-2.5 mm under air pressure of 0.6-0.8 MPa and a distance from the output of a shot-blasting machine nozzle up to the treated surface equal to 200-300 mm.

EFFECT: improving operational reliability of the repaired pipeline section and economic feasibility of the method.

7 cl, 4 dwg