US 4,646,827 A · Tubing anchor assembly

Abstract

A tubing anchor assembly for seating and supporting coiled tubing in a tubing head, which includes as a first element, a slip assembly characterized by multiple slip segments inserted in the slip bowl of the tubing head and each provided with a bevelled top face and a vertically oriented dove tail slot. As a second element, slip retainer screws are radially threaded in the tubing head body at spaced intervals, each of the slip retainer screws provided with a frustro conical tip having a bevelled tip base, and each tip extending into the slip bowl of the tubing head and engaging a dove tail slot in one of the slip segments. The slip segments are maintained in open configuration inside the upper portion of the slip bowl when the tips of the slip retainer screws are in engagement with the dove tail slots and when the slip retainer screws are threadably retracted in the tubing head body. A retainer ring located in a groove provided in each of the slip segments serves to maintain the slip segments in a desired alignment as a slip assembly inside the slip bowl and the slip segments are permitted to drop in concert by the influence of gravity from the frustro conical tips of the slip retainer screws as the slip retainer screws are caused to threadably travel toward the center of the slip bowl. The slip segments are secured in functional position in the slip bowl after release by engagement of the frustro conical tips with the bevelled top faces of the slip segments.

Claims25

Dependent claims

In a tubing anchor assembly for supporting tubing in a well, said tubing anchor assembly characterized by tubing support means having an internal bore and a tapered slip bowl in said bore;

a plurality of retainer means threadably and radially deployed in said tubing support means is spaced relationship and shaped ends on said retainer means, said shaped ends projecting into said slip bowl;
a plurality of slip means disposed in said slip bowl and dove tail slot means provided in said slip means, said dove tail slot means engaging said shaped ends on said retainer means, respectively;
the improvement in combination therewith comprising bevelled top faces provided on said slip means, whereby said slip means are suspended on said shaped ends in a first selected orientation and are released from said shaped ends and dropped into supporting contact with the tubing responsive to threadable rotation of said retainer means in said tubing support means, in a second selected orientation, and said shaped ends are extended into engagement with said bevelled top faces responsive to further threadable rotation of said retainer means.

In a tubing anchor assembly for supporting tubing in a well, said tubing anchor assembly characterized by:

(a) a tubing head and a slip bowl having a tapered, curved wall shaped in said tubing head;
(b) a plurality of retainer screw means radially and threadably disposed in said tubing head with one end of each of said retainer screw means extending into said slip bowl;
(c) a frustro conical tip shaped in said one end of said each of said retainer screw means and disposed adjacent the wall of said slip bowl;
and
(d) a plurality of generally wedge-shaped slip means disposed radially in said slip bowl and a dove tail slot provided in each of said slip means, said dove tail slot engaging said frustro conical tip of said retainer screw means, respectively, in a first orientation;
the improvement in combination therewith comprising a bevelled top face on each of said slip means, whereby threadable rotation of said retainer screw means in said tubing head extends said slip means away from the wall of the slip bowl and said dove tail slot in said slip means disengages said frustro conical tip and said slip means drops into engagement with the slip bowl and the tubing in a second orientation, and said frustro conical tip engages said bevelled top face in said slip means responsive to further threadable rotation of said retainer screw means, to retain said slip means in said slip bowl against the tubing, in a third orientation.

3 more elements

In a tubing anchor assembly for suspending a length of tubing in a well, said tubing anchor assembly characterized by:

(a) a tubing head having a central bore receiving the tubing and a tapered slip bowl in said bore;
at least two retainer screw means threadably provided in spaced, radial relationship in said tubing head;
and a frustro conical tip having a tip bevel shaped in one end of each of said retainer screw means and extending into said slip bowl;
and
(b) at least two slip means disposed in said slip bowl and a dove tail slot having a slot bevel shaped in each of said slip means, said dove tail slot provided with a slot bevel and engaging said frustro conical tip of said retainer screw means, respectively;
the improvement in combination therewith comprising a bevelled top face on each of said slip means and a tapered tip base on said frustro conical tip, whereby said slip means are selectively supported by said retainer screw means and released by said retainer screw means for disposal against the tubing, responsive to threadable advancement of said retainer screw means in said tubing head toward the tubing, and said frustro conical tip engages said bevelled top face in said slip means responsive to further threadable advancement of said retainer screw means, to retain said slip means in said slip bowl against the tubing.

3 more elements

Dependencies are inferred from the claim text.

Tubing anchor assembly

Life of this patent

Tubing anchor assembly

Life of this patent

Abstract

Claims25