CN220378239U - Split mandrel type casing hanger - Google Patents

Abstract

The utility model discloses a split mandrel type casing hanger, which comprises: a sealing body and an adapter; the sealing body is positioned in the casing head and is in sealing connection with the casing head, the upper end of the sealing body is positioned below the upper end of the casing head, and a connecting through hole is formed along the axial direction; the material of the adapter is different from that of the sealing body, and the minimum bearing value of the adapter bearing the internal pressure is more than or equal to 87Mpa. The mandrel type casing hanger adopts split type and comprises a sealing body and an adapter, wherein the adapter is used as an extension neck part outside a casing head, and can be made of a material with stronger bearing capacity, and then the adapter is assembled with the sealing body to form the mandrel type casing hanger, so that the adapter can bear the pressure with the minimum internal pressure of 87Mpa, the bearing capacity of the adapter is improved, meanwhile, the reliability of the mandrel type casing hanger is improved, and the service life is prolonged.

Description

Split mandrel type casing hanger

Technical Field

The utility model belongs to the technical field of mandrel type hangers, and particularly relates to a split mandrel type sleeve hanger.

Background

Casing head is used for fixed connection well head casing string for support the gravity of top layer sleeve pipe, technical sleeve pipe and reservoir sleeve pipe, sealed each layer of inter-layer annular space, for installation preventer, tubing head, the production tree provides transitional connection, and through two side mouths on the casing head body, can carry out construction operations such as makeup and extrusion mud, control and filling balancing liquid. Casing hangers are provided on the casing head and function to suspend casing strings in the well, and commonly used casing hangers are divided into slip and mandrel types.

The mandrel type casing hanger is of an integrated structure and is usually made of a stainless steel alloy (12 Cr 13) material, and as the mechanical property of the stainless steel alloy material (12 Cr 13) is generally 75K, namely, the minimum yield strength of the stainless steel alloy material in deformation is about 517 MPa=75000 psi, the internal pressure bearing capacity of an extension neck part at the upper end of the mandrel type casing hanger is limited, so that the extension neck part is easy to damage during the operation process of a 103.5MPa casing head fracturing procedure.

Disclosure of Invention

In order to solve the problems in the prior art, the utility model provides a split mandrel type casing hanger. The technical problems to be solved by the utility model are realized by the following technical scheme:

a split mandrel casing hanger comprising: a sealing body and an adapter;

the sealing body is positioned in the casing head and is in sealing connection with the casing head, the upper end of the sealing body is positioned below the upper end of the casing head, and a connecting through hole is formed in the axial direction;

the material of the adapter is different from that of the sealing body, and the minimum bearing value of the adapter bearing the internal pressure is more than or equal to 87Mpa;

the adapter comprises: double male shorts and couplings;

one end of the double male short circuit penetrates into the casing head to be in threaded connection with the upper part of the connecting through hole, and the other end of the double male short circuit is positioned outside the casing head and in threaded connection with one end of the coupling;

the part of the double male connectors, which is positioned outside the casing head, is connected with the oil pipe head in a sealing way;

the other end of the coupling is used for being in threaded connection with a drill rod when the novel mandrel type casing hanger is installed.

The utility model has the beneficial effects that:

the mandrel type casing hanger adopts split type and comprises a sealing body and an adapter, wherein the adapter is used as an extension neck part outside a casing head, can be made of a material with stronger bearing capacity, and is assembled with the sealing body to form the mandrel type casing hanger, so that the adapter can bear the internal pressure of 87Mpa minimum, the bearing capacity of the adapter is improved, and the service life is prolonged. The adapter is further a split double-male short circuit and a coupling, so that maintenance and replacement are facilitated, and connection reliability is improved.

The present utility model will be described in further detail with reference to the accompanying drawings and examples.

Drawings

FIG. 1 is a schematic view of an installation structure of a split mandrel casing hanger according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of a sealing body according to an embodiment of the present utility model.

Reference numerals illustrate:

10-sealing body; 11-connecting through holes; 12-clamping springs for shafts; 13-pressing ring; 14-trapezoid outer metal sealing rings; 15-trapezoid inner metal sealing rings; a 16-O-shaped sealing ring; 50-double-common short circuit; 51-coupling.

Detailed Description

The present utility model will be described in further detail with reference to specific examples, but embodiments of the present utility model are not limited thereto.

Example 1

As shown in fig. 1, a split mandrel casing hanger comprising: a sealing body 10 and an adapter. The sealing body 10 is detachably connected with the adapter. The sealing body 10 is positioned in the casing head 30 and is in sealing connection with the casing head 30, the upper end of the sealing body 10 is positioned below the upper end of the casing head 30, and the sealing body 10 is provided with a connecting through hole 11 along the axial direction.

The material of the adapter is different from that of the sealing body 10, the minimum bearing value of the internal pressure of the adapter is more than or equal to 87Mpa, and the requirement that the pressure value of the 103.5MPa casing head fracturing process is rated pressure multiplied by 0.8 is met. The adaptor is not the same material as the seal and the minimum mechanical properties of the adaptor material are 110K, i.e. 0.2% residual deformation minimum yield strength 758.4 mpa=110000 psi.

In this embodiment, the mandrel type casing hanger includes two parts of split sealing body 10 and adaptor, the adaptor is used as the "extension neck" part outside the casing head 30, and can adopt the material (110K) with stronger bearing capacity, and then the mandrel type casing hanger is formed by assembling with the sealing body 10, so that the adaptor can bear the pressure of 87Mpa of minimum internal pressure, the requirement that the pressure value of 103.5Mpa casing head fracturing procedure is rated pressure x 0.8 is satisfied, the bearing capacity of the adaptor is improved, meanwhile, the reliability of the mandrel type casing hanger is improved, and the service life is prolonged.

The sealing body 10 is made of a material of stainless steel 12Cr13 with mechanical property of 75K which is conventionally used for a mandrel type casing hanger, and the adapter is made of a material (80K or 95K or 110K or 125K) with the same or higher grade as the casing material.

As shown in fig. 1 and 2, further, the adapter includes: double pin 50 and coupling 51, double pin 50 and coupling 51 are detachably connected.

The two ends of the connecting through hole 11 are provided with internal threads, one end of the double-male short circuit 50 penetrates into the casing head 30 to be in threaded connection with the internal threads on the upper part of the connecting through hole 11, and the other end of the double-male short circuit 50 is positioned outside the casing head 30 and in threaded connection with one end of the coupling 51. The other end of collar 51 is adapted to be threadedly connected to the drill pipe when the new mandrel hanger is installed. The portion of the double male connector 50 that is located outside of the casing head 30 is sealingly connected to the tubing head. In use, one end of the double male connector 50 is the lower end and the portion of the collar 51 is the upper end. The double pin 50 and the collar 51 are both machined from the same or higher grade of casing material and are each capable of withstanding a minimum internal pressure of 87Mpa.

In this embodiment, the adaptor is further a split double male short 50 and coupling 51, which is convenient for maintenance and replacement, and improves the reliability of connection. In addition, as the double male connector 50 and the coupling 51 are finished products, the double male connector 50 and the coupling 51 which are made of materials meeting the pressure-bearing conditions can be selected, customized processing is not needed, and the cost is saved.

When the double male tab 50 is screwed with the internal thread at the upper part of the connecting through hole 11 of the sealing body 10, and when the double male tab 50 is screwed with the collar 51, it is necessary to apply GB/T23512-2015 (API RP 5 A3) thread sealing grease to form a seal.

Further, the sealing body 10 is in sealing connection with the casing head 30 through a clamping spring 12 for a shaft, a pressing ring 13, a trapezoid outer metal sealing ring 14, a trapezoid inner metal sealing ring 15 and two O-shaped sealing rings 16. The clamping spring 12 for the shaft is sleeved on the outer wall of the sealing body 10 near the upper end, the pressing ring 13 is sleeved on the outer wall of the sealing body 10, the pressing ring 13 is positioned below the clamping spring 12 for the shaft, the upper end of the pressing ring 13 abuts against the clamping spring 12 for the shaft, the lower end of the pressing ring 13 abuts against the upper end of the trapezoid outer metal sealing ring 14, the longitudinal section of the trapezoid outer metal sealing ring 14 is in an inverted trapezoid shape, the trapezoid inner metal sealing ring 15 is sleeved on the outer wall of the sealing body, the longitudinal section of the trapezoid inner metal sealing ring 15 is in a trapezoid shape, and the trapezoid outer metal sealing ring 14 is sleeved outside the trapezoid inner metal sealing ring 15. Two O-rings 16 are sleeved on the outer wall of the sealing body 10 and are positioned below the trapezoid inner metal sealing ring 15.

In the description of the present utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present utility model, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

In the present utility model, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.

In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present utility model. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Further, one skilled in the art can engage and combine the different embodiments or examples described in this specification.

The foregoing is a further detailed description of the utility model in connection with the preferred embodiments, and it is not intended that the utility model be limited to the specific embodiments described. It will be apparent to those skilled in the art that several simple deductions or substitutions may be made without departing from the spirit of the utility model, and these should be considered to be within the scope of the utility model.

Claims (1)

1. A split mandrel casing hanger, comprising: a sealing body (10) and an adapter;

the sealing body (10) is positioned in the casing head (30) and is connected with the casing head (30) in a sealing way, the upper end of the sealing body is positioned below the upper end of the casing head (30), and a connecting through hole (11) is formed along the axial direction;

the material of the adapter is different from that of the sealing body (10), and the minimum bearing value of the adapter bearing internal pressure is more than or equal to 87Mpa;

the adapter comprises: a double male connection (50) and a collar (51);

one end of the double male short circuit (50) penetrates into the casing head (30) to be in threaded connection with the upper part of the connecting through hole (11), and the other end of the double male short circuit is positioned outside the casing head (30) and is in threaded connection with one end of the coupling (51);

the part of the double male connectors (50) positioned outside the casing head (30) is connected with the oil pipe head in a sealing way;

the other end of the coupling (51) is used for being in threaded connection with a drill rod when the split mandrel type casing hanger is installed.