US 4,051,894 AGranted

Single string hanger system

AssigneeBaker International Corporation

InventorBobby F. Goad

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Abstract

Apparatus for adjusting the distance between a lower tubing hanger anchored in a well casing to support a depending lower tubing string, and an upper tubing hanger at the well head, in which an adjustable spacer device has its lower end connected to the lower tubing hanger and its upper end to the lower end of a safety valve connected to an upper tubing string extending to the upper tubing anchor, the valve being controlled hydraulically by fluid under pressure imparted through a control line strapped, or otherwise secured, to the upper tubing string and extending from the top of the well to the safety valve. The upper tubing string, safety valve and control line, as well as the upper portion of the spacer, are rotatable as a unit with respect to the lower portion of the spacer to lower the unit relative to the lower tubing hanger until the upper tubing hanger lands on its well head seat, such action occurring without twisting the control tubing relative to the safety valve.

Claims7

Dependent claims

Well production apparatus comprising lower subsurface tubing hanger means adapted to be disposed in a well casing set within a well and to support lower tubing extending downwardly in the well casing from the lower hanger means, upper tubing hanger means disposed at the surface of the well, a well head seat at the surface of the well for said upper tubing hanger means, upper tubular means extending from said lower tubing hanger means to said upper hanger means, said upper tubular means including a spacer connected to said lower hanger means, safety valve means connected to the upper end of said spacer, and means including upper tubing connected to the upper end of said valve and to said upper tubing hanger means, control tubing connected to said safety valve for feeding fluid under pressure to said valve to actuate the same, said control tubing extending upwardly along said upper tubular means, means securing said control tubing to said upper tubular means, said spacer comprising upper and lower members and means interconnecting said members to change the effective length of said upper tubular means in responsive to movement of said upper tubular means, control tubing and upper member relative to said lower member to bring said upper tubing hanger means downwardly into engagement with said well head seat and with said upper tubular means engaged by said lower tubing hanger means.

Dependencies are inferred from the claim text.