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High pressure fluid seals for sealing against a bit guide in wellhead and a method of using the seals are described. The high pressure fluid seals are primarily intended for use with a blowout preventer protector. The high pressure fluid seals are elastomeric material bonded to an end of a mandrel f

High pressure fluid seals for sealing against a bit guide in wellhead and a method of using the seals are described. The high pressure fluid seals are primarily intended for use with a blowout preventer protector. The high pressure fluid seals are elastomeric material bonded to an end of a mandrel for insertion into the wellhead. The end of the mandrel includes an annular ridge that protrudes into the elastomeric seal to inhibit the seal from being extruded away from the bore when the elastomeric seal is seated against the bit guide and the bore is subjected to elevated fluid pressures. The advantage is a high pressure fluid seal that ensures packoff against a bit guide even if the bit guide is worn but still serviceable. A further advantage is a more secure seal that improves safety and enables the use of higher pressures during well stimulation.

대표청구항 ▼

[ I claim:] [1.]1. A high pressure fluid seal for sealing against a bit guide in a wellhead, comprising in combination:a mandrel adapted to be inserted into the wellhead, the mandrel having an inner wall defining a bore, an outer wall and an end to which an elastomeric seal is directly bonded, the e

[ I claim:] [1.]1. A high pressure fluid seal for sealing against a bit guide in a wellhead, comprising in combination:a mandrel adapted to be inserted into the wellhead, the mandrel having an inner wall defining a bore, an outer wall and an end to which an elastomeric seal is directly bonded, the end including an annular ridge which protrudes into the elastomeric seal to provide an area of increased compression of the elastomeric seal against the bit guide to inhibit the elastomeric seal from being extruded away from the bore when the elastomeric seal is seated against the bit guide and the bore is subjected to elevated fluid pressures. [10.]10. A method of performing a well stimulation process, comprising the steps of:attaching a packoff assembly to an end of a mandrel used to isolate components of a wellhead from elevated fluid pressures used during the well stimulation process, the packoff assembly being adapted to be inserted into the wellhead, the packoff assembly having an inner wall defining a bore, an outer wall and an end for supporting an elastomeric seal, the end including an annular ridge which protrudes into the elastomeric seal to inhibit the seal from being extruded away from the bore when the elastomeric seal is seated against the bit guide and the bore is subjected to elevated fluid pressures;inserting the mandrel into the wellhead and seating the elastomeric seal against the bit guide in order to isolate components of the wellhead from fluid pressures required for the well stimulation process; andperforming the well stimulation process.