CONTROL DEVICE OF PNEUMATIC TOOL FOR PROCESSING OF WELL OR PIPE Russian patent published in 2012 - IPC E21B23/06 

FIELD: oil and gas industry.

SUBSTANCE: control device (3) of tool (1) is installed between outlet of fluid medium supply channel (2) and tool (1) and includes tight housing (4) interconnected through connection pipe (6) or simple drain hole to outer space, and through pipeline (30, 31-32, 33) to the tool. At that, piston (5) installed in tight housing (4) under action of spring (55) occupies in normal condition the first position in which it covers the outlet of the above supply channel (2), and the above connection pipe (6) is interconnected with the pipeline. When fluid medium pressure in outlet zone of supply channel (2) exceeds certain threshold value, the piston overcomes the force of spring (55) and moves to the second position in which connection pipe (6) is isolated, and supply channel (2) is interconnected with the above pipeline (30, 31-32, 33) equipped at least with one non-return valve (9) with pre-loaded spring, which provides fluid medium passage under pressure from tight housing (4) to tool (1) when the pressure at the valve inlet exceeds certain threshold value and prevents the passage of fluid medium in backward direction.

EFFECT: invention provides repair of damaged sections of casing pipe, effective pumping and emptying of the tool in deep wells or in fluid containing zones of the well; only one supply channel is used; besides, invention has simple and reliable design.

2 cl, 4 dwg