Importance

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Abstract

A bypass attachment is provided to prevent damage to the valves of a well tree when fluid at high pressure is passed into a well, such as during a fracturing process. The bypass attachment is formed of a piston rod removably mounted to the well tree and offset from it, a piston mounted on the piston rod, a cylinder movable on the piston, the cylinder bearing a piece of high-pressure tubing aligned with the passage through the well-head tree, a high-pressure valve to close off the high-pressure tubing and sealing means to seal the space between the exterior of the high-pressure tubing and the interior of the vertical passage through the well-head tree.

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First Claim