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A diversionary spool assembly for the completion hook up of any type of oil and gas well without the use of an expensive and cumbersome valve tree as a permanent part of the producing well. A single valve tree is provided, and is removably mounted on any one of a group of wells provided with diversi

A diversionary spool assembly for the completion hook up of any type of oil and gas well without the use of an expensive and cumbersome valve tree as a permanent part of the producing well. A single valve tree is provided, and is removably mounted on any one of a group of wells provided with diversionary spool assemblies only when a particular well in that group requires maintenance or remedial work to be performed thereon. Each diversionary spool assembly includes a rigid body having at least first and second passages therein, which body is operatively mounted on a tubing hanger supporting casing head for the first passage to be vertically aligned with a vertical bore in the tubing hanger and a tubing string that depends from the latter. The first passage in the normal operation of the well has a plug removably and sealingly disposed therein. A bonnet is removably secured to the body by bolts, which bolts are also capable of removably securing the anchor flange of a valve tree to the body to permit maintenance and remedial work to be performed on the well when the plug is removed from the first passage. When the remedial and maintenance work has been completed, the valve tree is removed from the body, the plug inserted in the first passage, the bonnet secured to the body, and the well returned to production.

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In combination with an oil and gas well that includes a casing head from which a string of tubing extends downwardly in a bore hole to a fluid producing zone, a diversionary spool assembly situated in a fixed position relative said well head to control fluid flow from said well and also serve as a t

In combination with an oil and gas well that includes a casing head from which a string of tubing extends downwardly in a bore hole to a fluid producing zone, a diversionary spool assembly situated in a fixed position relative said well head to control fluid flow from said well and also serve as a temporary mounting for a Christmas tree array of valves when maintenance work is to be performed on said well, said array of valves including an anchor flange on a lower end thereof, said diversionary spool assembly including; a. a rigid body mounted on said well head, said body having a top surface, and a plurality of passages therein, a first of said passages extending upwardly through said body and vertically aligned with said tubing string, said first passage having an upper end portion, and a second passage through which fluid flows; b. valve means for controlling the flow of fluid through said second passage; c, a plug removably and sealingly mounted in said upper end portion, said plug including an upper engageable portion; d. first movable means on said body for removably engaging said plug to maintain said plug at a fixed position in said first passage; e. a bonnet mounted on said top surface of said body that seals said upper end portion of said first passage; and, f. second means for removably securing said bonnet to said body that is also capable of securing said anchor flange of said christmans tree array of valves to said body after said bonnet is removed from the latter, said spool assembly when mounted on said well head capable of having oil and gas produced from said well, and said spool assembly permitting access to said well through said tubing string for maintenance work to be performed on said well by removing said bonnet from said body and thereafter securing said anchor flange of said array of valves to said body by said second means, moving said first means to disengage from said plug, engaging said engageable portion of said plug and moving said plug upwardly and outwardly from said first passage through said array of valves, performing the maintenance work, and thereafter reversing the above described procedure to return the diversionary spool assembly to an oil and gas producing condition.