CN121111168A - Integral double-pipe wellhead and christmas tree device - Google Patents
Integral double-pipe wellhead and christmas tree deviceInfo
- Publication number
- CN121111168A CN121111168A CN202511675857.8A CN202511675857A CN121111168A CN 121111168 A CN121111168 A CN 121111168A CN 202511675857 A CN202511675857 A CN 202511675857A CN 121111168 A CN121111168 A CN 121111168A
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- Prior art keywords
- wellhead
- integral
- insertion part
- locking seat
- wall
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Abstract
本发明涉及一种整体式双管井口与采油树装置，包括下部井口，下部井口内壁上设有承载台阶，承载台阶上抵接有承载环，承载环上抵接有锁紧座，锁紧座外侧与下部井口螺纹连接，锁紧座内侧螺纹连接有上部整体式井口，所述锁紧座内壁顶部与上部整体式井口的连接部设有内插接部，锁紧座外壁顶部与下部井口连接处设有外插接部，下部井口顶部设有与外插接部底部轮廓相适配的第一插接槽，上部整体式井口底部外壁上设有与所述内插接部的顶部轮廓相适配的第二插接槽，第一插接槽与外插接部底部抵接处、第二插接槽与内插接部顶部抵接处分别夹设有第一密封圈。本发明有利于解决现有一些装置中采用的螺纹连接动作与密封效果配合度不佳的问题。
This invention relates to an integral dual-tube wellhead and Christmas tree device, comprising a lower wellhead, a bearing step on the inner wall of the lower wellhead, a bearing ring abutting the bearing step, and a locking seat abutting the bearing ring. The outer side of the locking seat is threadedly connected to the lower wellhead, and the inner side of the locking seat is threadedly connected to the upper integral wellhead. The top of the inner wall of the locking seat has an inner insertion portion connecting to the upper integral wellhead, and the top of the outer wall of the locking seat has an outer insertion portion connecting to the lower wellhead. The top of the lower wellhead has a first insertion groove that matches the bottom contour of the outer insertion portion, and the bottom outer wall of the upper integral wellhead has a second insertion groove that matches the top contour of the inner insertion portion. First sealing rings are respectively clamped at the abutment points of the first insertion groove and the bottom of the outer insertion portion, and at the abutment points of the second insertion groove and the top of the inner insertion portion. This invention helps to solve the problem of poor matching between the threaded connection action and sealing effect in some existing devices.
Description
Technical Field
The invention relates to the field of oil gas development devices, in particular to an integral double-pipe wellhead and christmas tree device.
Background
The well head device mainly comprises oil (gas) extraction tree, tubing head, casing head and related fittings, is oil (gas) extraction equipment for suspension, support, control, regulation and the like, is used as important equipment for oil and gas production, and has the advantage and disadvantage of the performance related to whether the oil and gas well can safely and efficiently produce. Advanced, with the continued development of the petroleum industry, there is also a growing demand for reliability and control of wellhead devices and valves, which has prompted and motivated continued improvement and development of wellhead devices.
Through searching, the patent with the application number of CN202310231059.0 in the prior art discloses an integral double-pipe wellhead and christmas tree device which comprises a lower wellhead, an upper integral wellhead, a first casing hanger, a second casing hanger, a sealing device, a double-oil-pipe hanger and an integral double-pipe christmas tree, wherein a first bearing step is arranged on the inner wall of the lower wellhead and is used for installing the first casing hanger, the upper integral wellhead is in sealed connection with the lower wellhead, a second bearing step and a third bearing step are respectively arranged in the upper integral wellhead, the second bearing step is used for installing the second casing hanger, the sealing device is arranged on the second casing hanger and is locked in the upper integral wellhead through a first locking mechanism, the double-oil-pipe hanger is locked in the upper integral wellhead through a second locking mechanism, and the integral double-oil-pipe christmas tree is communicated with two oil pipes through the double-oil-pipe hanger.
In the technical scheme, the outer side of the lower end of an integral wellhead at the upper part of the locking seat is connected with a bearing ring in a threaded manner, the inner wall of the upper end of the lower wellhead is provided with a fourth bearing step for installing the bearing ring, the inner thread of the upper end of the lower wellhead is connected with a locking seat in a threaded manner, the lower end of the locking seat is tightly pressed on the fourth bearing step, and the inner wall and the outer wall of the locking seat are respectively connected with the integral wellhead at the upper part and the lower wellhead in a sealing manner through an inner sealing ring and an outer sealing ring. Because the locking seat is internally and externally provided with the threaded connection structure, and the sealing effect is realized in a mode that the inner wall and the outer wall of the locking seat are directly connected with the connecting part through the sealing ring, in practice, the threaded screwing action is accompanied with the relative axial displacement of the locking seat and the connecting part, the sealing ring in the connecting gap is easy to run out, and the sealing ring slides out of the sealing groove, so that the screwing resistance of the threaded connection is increased, the screwing is difficult, the deviation from the expected sealing effect can be caused, and the sealing effect is greatly influenced.
Disclosure of Invention
The invention provides an integral double-pipe wellhead and christmas tree device, which is beneficial to solving the problem of poor matching degree of screw connection action and sealing effect adopted in the existing devices.
The invention is realized in the following way:
The utility model provides an integral double-barrelled well head and christmas tree device, includes lower part well head, lower part well head bottom sealing connection top layer sleeve pipe is equipped with on the lower part well head inner wall and bears the step, bears the butt on the step and has the carrier ring, bears the carrier ring and has the locking seat, locking seat outside and lower part well head threaded connection, locking seat inboard threaded connection has upper portion integral well head, upper portion integral well head internal connection has two oil pipes, locking seat inner wall top and upper portion integral well head's connecting portion are equipped with interior grafting portion, locking seat outer wall top and lower part well head junction are equipped with outer grafting portion, interior grafting portion's longitudinal section all is the wide structure in the upper portion, the longitudinal section of outer grafting portion all is the wide structure in the lower part, lower part well head top be equipped with the first jack groove of outer grafting portion bottom profile looks adaptation, be equipped with on the integral well head bottom outer wall of upper portion with interior grafting portion top profile looks adaptation, first jack groove and interior grafting portion top portion butt department are equipped with first sealing washer respectively.
On the basis of the technical scheme, the inner side end face of the inner connecting part and the inner thread end face of the locking seat are positioned on the same longitudinal face.
On the basis of the technical scheme, the radial outer side of the second inserting groove is provided with the flange part with the narrow bottom and the wide top, and the inner side wall of the flange part can form an inclined plane attaching structure with the outer side wall of the inner inserting part after locking.
On the basis of the technical scheme, the inner wall of the first inserting groove, which is close to one side of the locking seat main body, and the inner wall of the locked outer inserting part form an inclined plane attaching structure.
On the basis of the technical scheme, the abutting part of the first inserting groove and the bottom of the outer inserting part and the abutting part of the second inserting groove and the top of the inner inserting part are positioned at the same horizontal position.
On the basis of the technical scheme, a pre-fixed connection structure is arranged between the first sealing ring and the inner plug-in connection part or the outer plug-in connection part.
On the basis of the technical scheme, the pre-fixing connection structure is an adhesive tape.
On the basis of the technical scheme, the first sealing ring is internally provided with a framework, the framework comprises a rigid core body with a circular ring structure, a plurality of ribs extending along the radial direction are uniformly distributed on the periphery of the rigid core body, and an elastic wrapping layer is arranged on the periphery of the framework.
On the basis of the technical scheme, a plurality of hollowed-out parts are arranged in the elastic wrapping layer.
On the basis of the technical scheme, the second sealing ring is clamped at the inclined plane attaching structure.
Compared with the prior art, the invention at least comprises the following advantages:
the invention effectively solves the problem of poor matching degree of the threaded connection action and the sealing effect in the prior art through a unique splicing structure and an inclined surface fitting design. The upper narrow lower wide structure of the inner plug-in part and the outer plug-in part and the cooperation with the corresponding plug-in groove enable the installation position of the first sealing ring to be more reliable and stable, and reduce the possibility of the sealing ring running. Meanwhile, the inner end surface and the outer end surface of the locking seat can keep the longitudinal end surface in a threaded structure area, and the longitudinal end surface and the installation position of the first sealing ring are arranged in a separable mode, so that the influence of mutual interference between a threaded connection action and a sealing ring extrusion deformation action can be effectively avoided, the sealing performance is further improved, and the safety and the reliability in the oil gas exploitation process are ensured.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some examples of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of the structure of an integral dual pipe wellhead and tree of example 1;
FIG. 2 is an enlarged view of a portion of FIG. 1A;
FIG. 3 is a partial schematic view of the mounting structure of the first seal ring of FIG. 2;
fig. 4 is a schematic perspective view of the first seal ring in embodiment 2 in a bottom-up state;
FIG. 5 is a partial schematic view of the mounting structure of the first seal ring in embodiment 2;
FIG. 6 is a cross-sectional view of the first seal ring of example 3;
FIG. 7 is a cross-sectional view of the first seal ring of example 4;
fig. 8 is a partial schematic view of the mounting structure of the first seal ring in embodiment 5.
The drawing shows that the well head comprises a lower well head 1, a first plugging groove, an upper integral well head 2, a flange part 201, a second plugging groove 202, a second sealing groove 203, a first casing hanger 3, a second casing hanger 4, a second casing hanger 5, a sealing device 6, a double-oil-pipe hanger 7, an integral double-pipe christmas tree 8, a surface casing 9, a surface casing hanger 10, a bearing step 11, a bearing ring 12, a locking seat 1201, an inner plug part 1202, an outer plug part 1203, a first sealing groove 13, a first sealing ring 1301, a cementing strip 1302, a framework 1303, a hollowed-out part 14 and a second sealing ring.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, based on the embodiments of the invention, which are apparent to those of ordinary skill in the art without inventive faculty, are intended to be within the scope of the invention. Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention.
In the description of the present invention, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying 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 invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
It will be understood that when an element is referred to as being "mounted" to another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only and are not meant to be the only embodiment.
The invention will be described in further detail with reference to the drawings and the specific examples.
Embodiment 1. The embodiment discloses an integral double-pipe wellhead and christmas tree device to effectively solve the problem of poor matching degree of threaded connection action and sealing effect in the existing devices, improve the sealing performance and connection stability of the wellhead device, and ensure the safety and high efficiency of the oil and gas exploitation process.
Referring to fig. 1, the integral double-pipe wellhead and christmas tree device in this embodiment comprises a lower wellhead 1, wherein the bottom of the lower wellhead 1 is connected with a surface casing 8 in a sealing manner, so as to provide basic support for the whole device and connection with a stratum. The lower wellhead 1 is internally connected with a first casing hanger 3, and the first casing hanger 3 is used for hanging intermediate layer casings. The lower end of the upper integral wellhead 2 is in sealing connection with the upper end of the lower wellhead 1, and seals a sleeve annulus between the surface sleeve 8 and the middle layer sleeve, a second sleeve hanger 4 is arranged in the upper integral wellhead 2, and the second sleeve hanger 4 is used for hanging and sealing connection with the inner layer sleeve. A sealing device 5 is mounted on the second casing hanger 4 for sealing the casing annulus between the middle casing and the inner casing. The upper integral wellhead 2 is also provided with a double tubing hanger 6, the double tubing hanger 6 is used for hanging and respectively sealing and connecting the two inner tubing, and the double tubing hanger 6 seals the space between the upper integral wellhead 2 and the two inner tubing. The integral double-pipe christmas tree 7 is connected with the upper end of the upper integral wellhead 2, and two channels in the integral double-pipe christmas tree 7 are respectively communicated with two oil pipes through a double-oil pipe hanger 6. The surface casing hanger 9 is of an inverted slip construction. The slips are fixedly connected to the bottom of the lower wellhead 1 through inverted bolts, and clamp and suspend the surface casing 8. It should be noted that, the main structure of the integral double-pipe wellhead and the christmas tree device is in the prior art, the specific structure and the working principle thereof are shown in the disclosure of the prior patent CN202310231059.0, and are not described herein again, and a person skilled in the art can select from the prior art according to the actual operation situation.
As shown in fig. 2 and 3, a bearing step 10 is arranged on the inner wall of the lower wellhead 1, a bearing ring 11 is abutted on the bearing step 10, and the bearing ring 11 plays a role in transferring and dispersing load. The bearing ring 11 is abutted with a locking seat 12, the outer side of the locking seat 12 is in threaded connection with the lower wellhead 1, and preliminary fixation of the locking seat 12 and the lower wellhead 1 is achieved. The inside threaded connection of locking seat 12 has upper portion integral well head 2, and upper portion integral well head 2 internally connected has two oil pipes for the transportation of oil gas.
In order to solve the problems of sealing and connection stability, an inner plug part 1201 is arranged at the connection part of the top of the inner wall of the locking seat 12 and the upper integral wellhead 2, and an outer plug part 1202 is arranged at the connection part of the top of the outer wall of the locking seat 12 and the lower wellhead 1. The inner plug-in portion 1201 has a vertical cross section with a narrow upper portion and a wide lower portion, and the outer plug-in portion 1202 has a vertical cross section with a narrow upper portion and a narrow lower portion, which is particularly advantageous. The top of the lower wellhead 1 is provided with a first plug-in groove 101 matched with the bottom contour of the outer plug-in part 1202, and the outer wall of the bottom of the upper integral wellhead 2 is provided with a second plug-in groove 202 matched with the top contour of the inner plug-in part 1201. The first sealing ring 13 is clamped at the abutting part of the bottom of the first inserting groove 101 and the outer inserting part 1202, and the abutting part of the top of the second inserting groove 202 and the inner inserting part 1201 respectively, in fact, the installed first sealing ring 13 is horizontally arranged horizontally, the first sealing ring is arranged horizontally in a separable manner with the longitudinal end face where the thread structure is located on the inner wall and the outer wall of the locking seat 12, the first sealing ring and the second sealing ring are not arranged on the associated longitudinal plane, the longitudinal displacement in the thread locking process does not affect the longitudinal position of the first sealing ring 13, further, the longitudinal running position cannot occur like the conventional structure, and further, the locking resistance is increased, the sealing effect is reduced due to the dislocation of the sealing position, namely, the sealing performance of the connecting part can be effectively improved through the arrangement of the inserting structure and the sealing ring.
As shown in fig. 3, a first concave sealing groove 1203 is disposed at the central position of the top of the first plugging groove 101, a second sealing groove 203 is disposed at the position corresponding to the top end surface of the second plugging groove 202, and the first sealing groove 1203 and the second sealing groove 203 are annular grooves with semicircular longitudinal sections for clamping the upper and lower ends of the first sealing ring 13.
Further, the inner end surface of the inner plug 1201 is located on the same longitudinal surface as the inner threaded end surface of the locking seat 12. The design ensures that the internal joint 1201 is more coordinated with the internal thread part of the locking seat 12 in structure, the force can be better transmitted in the process of installation and stress, the longitudinal displacement is smoother and more stable, and the problem of stress concentration caused by structural mismatch is avoided, thereby improving the strength and the stability of the whole joint part.
The second insertion groove 202 is provided with a flange portion 201 having a narrower lower portion and a wider upper portion on the outer side in the radial direction, and the inner wall of the flange portion 201 and the outer wall of the locked inner insertion portion 1201 can form a slant fitting structure. The inclined surface attaching structure can generate a certain self-locking effect in the locking process, when the locking seat 12 and the upper integral wellhead 2 are screwed by threads, the inclined surfaces of the inner plug-in part 1201 and the flange part 201 are mutually extruded, and the single longitudinal movement is converted into a longitudinal and transverse limiting self-locking structure, so that the connection is more compact and difficult to loosen. Simultaneously, this kind of structure can also further strengthen sealed effect, because the laminating of inclined plane can prevent oil gas leakage better.
The inner wall of the first plugging groove 101 near the main body side of the locking seat 12 and the inner wall of the locked outer plugging part 1202 form an inclined surface attaching structure. Similar to the above principle, the inclined surface fitting structure can also improve the connection stability and sealing performance between the lower wellhead 1 and the locking seat 12. During the screwing process, the outer plug portion 1202 and the inclined surface of the first plug groove 101 are mutually extruded, so that the firmness of connection is enhanced, and oil gas leakage from the connection part is effectively prevented.
In this embodiment, the contact point between the first plugging groove 101 and the bottom of the outer plugging portion 1202 and the contact point between the second plugging groove 202 and the top of the inner plugging portion 1201 are located at the same horizontal position, that is, the mounting positions of the inner and outer first sealing rings 13 of the locking seat 12 are located at the same horizontal plane. The design ensures that the stress of the two sealing parts is more uniform, is beneficial to ensuring that the inner and outer first sealing rings 13 basically synchronously receive longitudinal extrusion and synchronously generate deformation resistance in the thread locking process, and can jointly play a role when bearing internal pressure and external load, thereby improving the sealing reliability of the whole device. If the two sealing parts are not positioned at the same horizontal position, uneven stress can be caused, and part of the sealing parts bear excessive pressure, so that the sealing effect and the service life are affected, and in the screwing process, if the extrusion deformation time of the two first sealing rings 13 is inconsistent, resistance change caused by uncontrollable deformation of the single first sealing ring 13 can occur, and the stability of the subsequent screwing action is further affected.
Embodiment 2 in this embodiment, as shown in fig. 4 and 5, a pre-fixing connection structure is provided between the first seal ring 13 and the inner plug portion 1201 or the outer plug portion 1202 on the basis of embodiment 1. The function of the pre-fixed connection is to prevent the first sealing ring 13 from running during installation, ensuring that it can be accurately installed in the sealing position. In the present invention, the pre-fixing connection structure adopts the glue tape 1301, and the glue tape 1301 is arranged at the bottom of the first sealing ring 13, so that the glue tape can be always fixed in the first sealing groove 1203 before locking. The adhesive tape 1301 has a certain viscosity, and can temporarily fix the first sealing ring 13 on the inner plug part 1201 or the outer plug part 1202, and even if certain vibration or displacement occurs during the installation process, the first sealing ring 13 cannot easily separate from the predetermined position, thereby ensuring the accuracy and reliability of the sealing installation.
Embodiment 3 on the basis of embodiment 1, as shown in fig. 6, in this embodiment, a skeleton 1302 is provided inside the first sealing ring 13, the skeleton 1302 includes a rigid core body with a ring structure, a plurality of ribs extending radially are uniformly distributed on the periphery of the rigid core body, the rigid core body and the ribs are made of aluminum, and an elastic wrapping layer is provided on the periphery of the skeleton 1302, and is made of rubber. The rigid core provides the primary shape support for the first seal ring 13, providing it with a certain strength and rigidity, and being able to withstand a certain pressure without excessive deformation. The rib design further enhances the strength and stability of the backbone 1302, and increases the contact area with the elastic wrapping layer, thereby improving the bonding force between the backbone 1302 and the elastic wrapping layer. The elastic wrapping layer gives the first sealing ring 13 good elasticity and sealing performance, can elastically deform when receiving pressure, fills the gap of the connecting part, and realizes good sealing effect.
Embodiment 4 based on embodiment 3, as shown in fig. 7, in this embodiment, a plurality of hollowed-out portions 1303 are provided in the elastic wrapping layer, and the hollowed-out area of the hollowed-out portions 1303 is larger as they are closer to the outer side, so as to improve flexibility. The arrangement of the hollowed-out portion 1303 has multiple functions. On the one hand, the weight of the first sealing ring 13 can be reduced, the load of the whole device is reduced, and on the other hand, the hollowed-out part 1303 can deform when the sealing ring is stressed, so that a buffer space is formed, the stress concentration is reduced, the pressure resistance of the sealing ring is improved, and the service life of the sealing ring is prolonged. In addition, the hollowed-out part 1303 can improve the elastic performance of the sealing ring to a certain extent, so that the sealing ring can be restored to the original state more quickly when the pressure changes, and a good sealing effect is maintained.
Example 5 in this example, as shown in fig. 7, two second seal rings 14 are sandwiched at the bevel bonding structure on the basis of example 1. The upper and lower sides of the second sealing ring 14 are also provided with sealing grooves for limiting and fixing, and it is to be noted that the longitudinal profile of the sealing grooves is not a semicircular structure, but is an eccentric profile, and the purpose of the sealing grooves is to improve the pre-fixing effect of the sealing grooves, so that the sealing performance of the inclined surface attaching part is further enhanced due to the arrangement of the second sealing ring 14. In the slope attaching structure, although oil gas leakage can be prevented to some extent by the pressing of the slope, a minute gap may still exist due to the influence of factors such as machining accuracy and installation error. The second sealing ring 14 can fill the tiny gaps to form double sealing guarantee, and the sealing reliability of the whole device is greatly improved.
The foregoing embodiments are merely for illustrating the technical solution of the present invention, but not for limiting the same, and although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those skilled in the art that modifications may be made to the technical solution described in the foregoing embodiments or equivalents may be substituted for parts of the technical features thereof, and that such modifications or substitutions do not depart from the spirit and scope of the technical solution of the embodiments of the present invention in essence.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511675857.8A CN121111168B (en) | 2025-11-17 | 2025-11-17 | Integral double-pipe wellhead and christmas tree device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202511675857.8A CN121111168B (en) | 2025-11-17 | 2025-11-17 | Integral double-pipe wellhead and christmas tree device |
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| Publication Number | Publication Date |
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| CN121111168A true CN121111168A (en) | 2025-12-12 |
| CN121111168B CN121111168B (en) | 2026-01-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202511675857.8A Active CN121111168B (en) | 2025-11-17 | 2025-11-17 | Integral double-pipe wellhead and christmas tree device |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN121111168B (en) | 2026-01-23 |
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