TRAP Russian patent published in 1997 - IPC

FIELD: oil production industry. SUBSTANCE: this relates to producing oil from wells by means of electric subsurface and rod-type pumps. Trap widens functional capabilities and can be used with various types of pumps. Trap has cylindrical body which accommodates inlet and outlet bushes-adapters and trap proper made in the form of pipe union which is located in body coaxially and connected with body by its lower part to form annular space with it. They are closed by metal net. Annular space is connected with pipe union space through openings. Pipe union is provided with rubber stopper having spherical portion which is cut in radial directions into sectors. Upper part of rubber stopper is in the form of flat narrow part. Inlet and outlet bushes-adapters are provided with shaped flat springs which ensure centering of plunger or subsurface investigation instrument being lowered in well. EFFECT: high efficiency. 5 dwg