RU96907U1 - DEVELOPER FOR LINING CASES ON WELL MOUTH - Google Patents

Abstract

 A device for tying casing strings at the wellhead, mounted on the well conductor and comprising a housing and a centralizer coupling, made coaxially with fit cones and thread for connecting to the pipe string, an annular cap cover of the casing and an annular sealing element, characterized in that the annular sealing the element is installed between the pressure and support rings, while the centering angle α of the housing cone and the centralizer sleeve is within 15-90 °, and the height of the centering belt of the centralizer sleeve is n is in the range h / D = 0.1 ... 0.5, where h is the height of the centering belt, D is the inner diameter of the centralizer coupling.

Description

The utility model relates to the field of mining and is used for tying casing strings at the wellhead.

The patent / RF patent №2.345.211 for the invention ЕВВ 33/04, published on January 27, 2009 / - adjustable wellhead equipment, which contains a body with an internal conical surface and radial holes in which the pipes are installed, is taken as an analogue. Inside the case there is a sub, on which a centralizer, bearing, clutch, an elastic sleeve on which the nut presses are mounted. On the upper and lower surfaces of the covers are boring, in which a metal seal. Covers are pulled together by hairpins.

The disadvantages of the analogue are as follows. First of all, the complexity of the design. The presence of a bearing requires a special fit on the shaft. Bearing replacement is difficult because it is inside the structure and in order to reach it, the removal of other parts and assemblies is required. The lack of seals in the lower part of the structure (from the housing side) increases the likelihood of contamination of the bearing and its failure.

Devices for tying casing strings at the wellhead are known / Utility Model of the Russian Federation No. 97107292 for the invention of IPC ЕВВ 33/03 / (prototype). Wellhead equipment for strapping casing strings contains coaxial housings located on the well conductor with landing cones, threads for connecting with coaxial strings of pipes, ring cap covers of shells and ring sealing elements, the latter are installed between the shells.

The disadvantage of the prototype is the complexity of the design. Insufficient tightness of the annular space. The complexity of mounting the column head.

The technical problem facing the utility model is to increase the sealing of the wellhead, reduce the overall dimensions, and increase the ease of installation of the column head.

The technical problem is solved by the fact that in the wellhead equipment for casing strings installed on the well conductor and comprising a housing and a centralizer coupling made of pine, containing a landing cone, a thread on the centralizer coupling for connecting to the pipe string, an annular housing cover cap, a pressure and a support ring, an annular sealing element, the latter is installed between the pressure and support rings, and the centering angle α of the housing cone and the centralizer coupling is within 15-90 degrees, while ota centering collar h-centraliser sleeve is in a range h / D = 0,1 ... 0,5, where D - diameter of the inner-sleeve centralizer.

The utility model is illustrated by the drawing, in which Fig. 1 shows a general sectional view of the inventive device.

A device for strapping casing strings includes a housing 1, a centralizer coupling 2, an annular sealing element 3, a cap 4, a pressure ring 5, a support ring 6, a conductor 9, studs 10.

A device for strapping casing is assembled as follows. The housing 1 is screwed onto the conductor 9. The production pipe string is lowered. The centralizer sleeve is screwed onto the last pipe 2. The production string is unloaded to the centralizer sleeve. The centralizer sleeve with the pipe string is installed on the conical surface 8 of the housing 1. After the cementation of the column, a pressure ring 5 and a support ring 6 are installed in the space between the housing and the centralizer sleeve, between which the sealing element 3 is placed. Tighten the nuts on the studs 10 uniformly and ensure tightness annular space. Screw the cap 4 onto the housing 1 and crimping.

The installation of the sealing element 3 between the pressure ring 5 and the support ring 6 increases the tightness of the annular space. The centering angle of the landing cones 8 on the housing 1 and the coupling-centralizer 2, made in the range of α = 15-90 degrees, increases the ease of installation of the column head. And subject to the ratio h / D = 0.1 ... 0.5, where h is the height of the centering belt 7 of the centralizer coupling, D is the inner diameter of the centralizer coupling, a reduction in overall dimensions is achieved.

Thus, a new set of essential features of the claimed solution ensures the achievement of the specified technical result.

Claims (1)

A device for tying casing strings at the wellhead, mounted on a well conductor and comprising a housing and a centralizer coupling, made coaxially with fit cones and thread for connecting to a pipe string, an annular cap cover of the housing and an annular sealing element, characterized in that the annular sealing the element is installed between the pressure and support rings, while the centering angle α of the housing cone and the centralizer coupling is within 15-90 °, and the height of the centering belt of the centralizer coupling is n is in the range h / D = 0.1 ... 0.5, where h is the height of the centering belt, D is the inner diameter of the centralizer coupling.