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A well tree isolation apparatus comprising a single hydraulic cylinder supported in axial alignment over a well tree by at least two elongated support rods. The hydraulic cylinder support rods are connected between a base plate and a hydraulic cylinder mounting plate to support the hydraulic cylinde

A well tree isolation apparatus comprising a single hydraulic cylinder supported in axial alignment over a well tree by at least two elongated support rods. The hydraulic cylinder support rods are connected between a base plate and a hydraulic cylinder mounting plate to support the hydraulic cylinder above the well tree a distance approximately equal to the height of the production tree. The apparatus permits the insertion of a single length of high pressure tubing through any well tree, regardless of its height. Once the high pressure tubing is seated in a well tubing or casing, the hydraulic cylinder, hydraulic cylinder plate and support rods are removed to provide 360°access to a high pressure valve attached to the top of the high pressure tubing.

대표청구항 ▼

An apparatus for injecting fluids, gases, solid particles or mixtures thereof through a well tree having a vertical passage therethrough and including at least one valve and into a well having a production tubing or a well casing aligned with said vertical passage, said apparatus comprising: (a) a h

An apparatus for injecting fluids, gases, solid particles or mixtures thereof through a well tree having a vertical passage therethrough and including at least one valve and into a well having a production tubing or a well casing aligned with said vertical passage, said apparatus comprising: (a) a hydraulic cylinder; (b) a piston movable within said hydraulic cylinder; (c) a piston rod fixed to said piston and movable with said piston; (d) a length of high pressure tubing positioned in axial alignment with said vertical passage, piston rod, and hydraulic cylinder; and mounted for corresponding movement with said piston and said piston rod; (e) a high pressure valve located upon said high pressure tubing to selectively stop fluid flow through said high pressure tubing; (f) sealing means adapted to prevent passage of fluids and gases from the exterior of said high pressure tubing and the interior of said vertical passage to atmosphere when said high pressure tubing is inserted into said vertical passage; (g) second sealing means adapted to prevent the passage of fluids and gases from the interior of said high pressure tubing and the interior of said production tubing or said well casing to said vertical passage when said high pressure tubing is inserted within either said tubing or said casing; and (h) at least two elongated hydraulic cylinder support rods fixed relative to said well tree in a position parallel with and offset from said vertical passage and adapted to support said hydraulic cylinder, piston and piston rod in vertical and axial alignment with said vertical passage; said support rods, hydraulic cylinder, piston and piston rod being removable from said well tree when said high pressure tubing is operatively located within said vertical passage; and (i) hold down means for detachably securing said high pressure tubing and said high pressure valve to said well tree. A method of isolating a well tree located on an oil or gas well from the effects of high pressure or corrosion caused by stimulation of said well, said method comprising the steps of: (a) inserting into the vertical passage in said well tree an assembly comprising a length of high pressure tubing with a high pressure valve located on said tubing and sealing means adapted to prevent the passage of fluids and gases from the exterior or said high pressure tubing and the interior of said vertical passage to atmosphere, and positioning upon said well tree a combination comprising a hydraulic cylinder, a piston movable within said cylinder, a piston rod fixed to said piston and movable with said piston and at least two elongated hydraulic cylinder support rods fixed relative to said well tree in a position parallel with and offset from said vertical passage and adapted to support said hydraulic cylinder, piston and piston rod in vertical and axial alignment with said vertical passage, said high pressure valve and said length of high pressure tubing; (b) securing said hydraulic cylinder support rods to said well tree; (c) applying hydraulic pressure to the interior of said cylinder to force said piston rod downwardly to engage said high pressure valve and tubing assembly and force said high pressure tubing down said vertical passage until said high pressure tubing is operatively located within said vertical passage and a second sealing means, affixed to the lower end of said high pressure tubing and adapted to prevent the passage of fluids and gases from the interior of said high pressure tubing and the interior of the production tubing or well casing of said well to said vertical passage, is located within the interior of said production tubing or well casing; (d) applying a hold down means to secure said high pressure tubing and said high pressure valve to said well tree; and (e) disengaging said hydraulic cylinder support rods from said well tree and removing from said well tree said combination of said hydraulic cylinder, piston, piston rod and said support rods.