Wiper device for stripping fluid from well pipe

Patent · Tue Jul 03 00:00:00 EDT 1984

OSTI ID:6525625

Brown, W H; Briscon, B H; Cuthill, T F; McLaren, L W

A wiper device is provided comprising a container having a central opening through which the well string may pass. A pair of opposed wiper pads disposed in a horizontal attitude are mounted in spaced vertical relationship within the container for longitudinal movement toward each other, to engage the vertical string. A double-acting pneumatic cylinder actuates each pad. Each cylinder is mounted in the plane of the pad, said cylinder being connected at its front end with the rear portion of the wiper pad and being pivotally connected at its rear end with a support member. The front end of the cylinder is thus adapted to rotate in a horizontal plane about its pivot connection, to accommodate transverse movement of the attached wiper pad. The container side walls are spaced from the wiper pad edges to permit such transverse movement to take place. Arrays of anti-friction rollers support each of the pads. The spacing of the walls, pivoting capability of the cylinder in a horizontal plane, and provision of the anti-friction means combine to permit transverse movement of the wiper pads. The head ends of the cylinders are interconnected by a line to enable air, displaced from one cylinder, to move to the other, to permit of longitudinal movement of the pads. The head ends of the cylinders are also connected with a pulsation tank, so that if both cylinders are simultaneously contracted by passage of an enlargement through the pads, there is little change in wiping pressure. Thus the pads can free-float with the well string, while maintaining a substantially constant wiping pressure.

• Assignee: EDB-84-174192
• Patent Number(s): US 4457366
• OSTI ID: 6525625
• Resource Relation: Patent Priority Date: Priority date 30 Sep 1983, Canada; Other Information: PAT-APPL-537330
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
42 ENGINEERING
DRILL PIPES
CLEANING
DRILLING FLUIDS
RECOVERY
FIELD PRODUCTION EQUIPMENT
DESIGN
CYLINDERS
PNEUMATICS
SURFACE AREA
DRILLING EQUIPMENT
EQUIPMENT
FLUID MECHANICS
FLUIDS
MECHANICS
PIPES
SURFACE PROPERTIES
020300* - Petroleum- Drilling & Production
420206 - Engineering- Mining & Drilling Equipment & Facilities- (1980-1989)