FILTER UNIT FOR CHUTE TANK Russian patent published in 2024 - IPC E21B21/06 

FIELD: oil and gas industry.

SUBSTANCE: invention relates to oil and gas industry, in particular to treatment of process fluids during well repair. Chute tank includes three interconnected sections. Two filters are connected in parallel to the outlet section by means of inlet branch pipes. Outlet pipes of the filters are connected by a T-piece equipped with a valve at the free end. Inlet section is made with the possibility of supplying process liquid to it through the intake line and the damper, which provide for damping of flow rate and preliminary coarse cleaning. Each section is equipped with drain hatches with pressure plugs for removal of solid sludge. Level gauge is installed in the output section. Each of the filters consists of a cylindrical housing, which is plugged from below, and a cover fixed on the upper end of the cylindrical housing by means of a bolt joint. Cover is rigidly connected in the centre with the outlet branch pipe; inside the cylindrical housing there is a concentrically placed filtering screen of a cylindrical shape, which is screwed on the lower end of the cover and communicates with the outlet branch pipe. Above the filters the corresponding outlet branch pipes are connected to the T-joint. In the filter cover there is a hole in which a discharge branch pipe with a check valve passing from top to bottom is installed. Discharge branch pipe hydraulically connects the outlet branch pipe of the filter with the annular space of the cylindrical housing of the filter at the inlet of the filter screen. Cylindrical housing plugged from below is equipped with a drain valve. Pressure gauge is screwed into the T-joint.

EFFECT: improved quality of filtration of fluid spent in the well, excluding occurrence of emergencies in the well during subsequent technological operations, preventing negative environmental consequences as a result of repair works.

1 cl, 3 dwg