GB1368691A - Well packer - Google Patents

Abstract

1368691 Wells &c DRESSER INDUSTRIES INC 3 May 1972 [24 May 1971] 20605/72 Heading ElF A packer comprises a support 1, 11, 31, 47, a packer body 25 carrying packing 25a, 25b, a cylinder 38, a tubular member 19, pistons 28, 39 between the support and the cylinder forming a chamber A filled with fluid, a passage 34a from the chamber through the support, means 34 for closing the passage, and means 32 moved by a tool (not shown) to break the means 34 to connect the chamber to the interior of the support. Prior to running the packer into the well the chamber A is filled with liquid, the piston 28 being fixed during filling. The packer is attached to tubing and lowered to the desired level, changes in the temperature or pressure differential between the exterior of the packer and the chamber being compensated for by expansion or contraction of the liquid in the chamber. A setting tool (not shown) moves the sleeve 32 upwardly to shear the plug 34 and place ports 32c opposite the plug passage 34a to open the chamber to the interior of the support. Fluid pressure is applied to the interior of the tubing to increase the pressure in the chamber. The increase in pressure in the chamber shears a pin 44 and forces the cylinder 38 upwardly and the piston 39 downwardly. The downward movement of the piston 39 pivots and sets slips 49 whilst the upward movement of the cylinder 38 expands packing 25a, 25b and pivots and sets slips 8, locks 36 being freed by the downward movement of the piston 39. The packer is disengaged by an upward pull on the tubing which shears a pin 52 to free a slip control housing 50 to disengage the slips 49 whilst the upward movement of the valve 18 may be set to isolate the annular areas in the casing above and below the set packer.