There are flat surfaces with ring gaskets (11) and cylindrical strainer between these projections.

(e) Each finger strainer must be accessible for inspection and cleaning.

(d) Each finger strainer must be accessible for inspection and cleaning.

An elongate, typically cylindrical outer liner member, and an inner elongate liner member concentrically located therewithin is provided.

There are flat surfaces with ring gaskets (11) and cylindrical strainer between these projections.

The strainer (73) is installed in the strainer mounting part (81) of a valve body comprising a sleeve (62) having a port and the strainer mounting part (81) and a spool disposed in the sleeve (62) so as to be advanced and retreated.

(e) Each finger strainer must be accessible for inspection and cleaning.

(d) Each finger strainer must be accessible for inspection and cleaning.

The oil strainer assembly includes a strainer element and a housing.

Therefore, the water is discharged through the strainer's opening and cleans the strainer.

The invention also provides a screen provided with the screen support (1) of the invention and a shale provided with a screen of the invention.

well completion with screen and gravel pack

The self cleaning strainer may also include a brush attached diametrically opposite to the impeller to aid in removing debris from the inlet side of the strainer.

A liner (10, 30) or liner assembly is disclosed which is prefabricated with a means for enlarging its outside diameter prior to it being run in a well bore (11).

The screen is delivered to the location with a cover that blocks access to the screen from well fluids.