CN221144395U

CN221144395U - Tubing hanger

Info

Publication number: CN221144395U
Application number: CN202322885571.5U
Authority: CN
Inventors: 朱雄军; 秦世群; 范喜群; 张永成; 王静; 安虎
Original assignee: China Petroleum and Chemical Corp; Sinopec Henan Oilfield Branch Co
Current assignee: China Petroleum and Chemical Corp; Sinopec Henan Oilfield Branch Co
Priority date: 2023-10-26
Filing date: 2023-10-26
Publication date: 2024-06-14
Anticipated expiration: 2033-10-26

Abstract

The utility model belongs to the field of sealing or packing of oil wells, and particularly relates to an oil pipe hanger. In order to solve the technical problem that the tension tubing hanger in the prior art is inconvenient to use because the central tube rotates along with the rotation of the lifting tubing due to the fact that the lifting tubing needs to be mounted and dismounted through the clamping of the outer taper sleeve, the utility model provides the tubing hanger which comprises the central tube and the outer taper sleeve mounted on the outer portion of the central tube, the upper end of the central tube is provided with female threads for being in threaded fit connection with a lifting nipple, the upper end of the central tube is provided with an exposed portion exposed on the outer portion of the outer taper sleeve, and the exposed portion is provided with a clamped portion for being directly clamped and fixed by the central tube when the lifting nipple is mounted or dismounted. Through being by the clamping part, can be when installing the lifting nipple joint on the center tube or removing from the center tube, avoid the center tube to take place to rotate, it is very convenient to use.

Description

Tubing hanger

Technical Field

The utility model belongs to the field of sealing or packing of oil wells, and particularly relates to an oil pipe hanger.

Background

In the oil field exploitation process, an oil well production pipe column is hung on the inner conical surface of the wellhead large four-way joint through an oil pipe hanger, and the oil pipe hanger is in sealing connection with the inner conical surface of the wellhead large four-way joint through a sealing ring on the oil pipe hanger. In order to meet production needs, a packer is often required to be arranged on an oil pipe production column, the packer is pressed down by the weight of the oil pipe column to be set, when an oil layer is shallow, the depth of the packer to be set down is also small, the weight of the oil pipe above the packer is insufficient to set the packer, and at the moment, a tension packer is required to be used. When using a tension packer, a length of tubing (determined from the calculated position of the tension packer) is run from the wellhead and then the tubing is lifted to set the tension packer. In the above process, because the length of the oil pipe above the tension packer is short, a common oil pipe hanger cannot be used, and the tension oil pipe hanger is needed.

The utility model patent with the authority notice number of CN 2727383Y and the authority notice day of 2005.9.21 discloses a tension tubing hanger, which is shown in figure 1 and comprises an outer cone sleeve 11 and a central tube 12, wherein the outer cone sleeve 11 is provided with an inner cavity for the central tube to pass through, the upper end of a cone of the outer cone sleeve 11 is a dodecagonal polygon, the lower end of the cone is a cylinder, and the cone is in threaded connection with the central tube; the central tube 12 is an oil tube nipple, and the upper end and the lower end of the central tube are respectively provided with an oil tube female thread 13 and an oil tube male thread 14. When the tension packer is sealed by the tension tubing hanger seat, the lower end of the central tube 12 is in threaded connection with the last well entering tubing, and the upper end of the central tube 12 is in threaded connection with the lifting tubing; then, loosening the screw thread between the outer taper sleeve 11 and the central tube 12, lowering the oil tube and making the central tube 12 go into the well to a certain depth (the depth is calculated according to the tension packer setting distance and the oil tube elongation); then, the central pipe is rotated forward for 2-3 circles to realize the setting of the tension packer; then, lifting the lifting oil pipe to enable the threads of the central pipe 12 for threaded connection with the cone to be exposed from the wellhead large four-way joint; and finally, the outer taper sleeve 11 is in threaded connection with the central pipe 12, the tension tubing hanger is sealed in a wellhead large four-way joint, and the lifting tubing is removed.

However, in the use process of the tension tubing hanger, since the upper end of the outer taper sleeve is flush with the upper end of the central tube, the upper end of the central tube is not provided with a part for applying torque when the central tube is installed and removed with the lifting tubing, and the installation and the removal of the lifting tubing can only be realized by clamping the dodecagonal polygon at the upper end of the outer taper sleeve, so that the tension tubing hanger is very inconvenient to use, particularly in the process of removing the lifting tubing after the tension tubing hanger is already seated in the wellhead large four-way joint, only the outer taper sleeve is clamped, so that the central tube rotates along with the rotation of the lifting tubing, once the central tube rotates along with the lifting tubing, the removal of the lifting tubing cannot be smoothly realized, and the situation that the tension packer is possibly not tightly seated is caused, and the tension packer is possibly required to be seated again at the moment, so that the tension tubing hanger is very inconvenient to use.

Disclosure of utility model

The utility model aims to provide an oil pipe hanger, which solves the technical problems that in the prior art, a tension oil pipe hanger needs to be installed and disassembled by clamping a dodecagonal polygon at the upper end of an outer taper sleeve, so that a central pipe can rotate along with the rotation of the oil pipe, when the oil pipe is disassembled, once the central pipe rotates along with the oil pipe, the oil pipe cannot be smoothly disassembled, and the tension packer is possibly not tightly set, and at the moment, the tension packer needs to be re-set, so that the tension oil pipe hanger is very inconvenient to use.

In order to achieve the above purpose, the technical scheme of the oil pipe hanger provided by the utility model is as follows:

The utility model provides an oil pipe hanger, includes the center tube of vertical setting and installs the outside outer cone cover at the center tube when using, and the upper end of center tube is provided with the female screw that is used for with promoting nipple joint screw-thread fit connection, and the upper end of center tube has the exposed part of exposing outside outer cone cover, is equipped with on the exposed part and is used for supplying the center tube to directly be fixed by the centre tube by the centre gripping when installing or dismantling to promote the nipple joint.

The beneficial effects are as follows: the utility model provides an improved utility model. The upper end of the central tube is exposed from the outer cone sleeve, and the clamped part is arranged at the exposed part, so that the central tube can be directly clamped by the clamped part when the lifting nipple is installed on the central tube, and the central tube is prevented from rotating; meanwhile, in the process of disassembling the lifting nipple after the tension packer is set, the clamping part is clamped, so that the rotation of the central tube can be avoided, and the condition that the tension packer is not set tightly is avoided. To sum up, when using this oil pipe hanger, can prevent that the center tube from rotating with the in-process of promoting the nipple joint on the center tube of installing, simultaneously, also can prevent that the center tube from rotating with the in-process of promoting the nipple joint and dismantling from the center tube, it is very convenient to use.

Further, the outer surface of the clamped part is polygonal.

The beneficial effects are as follows: for the outer surface of being the columniform technical scheme of clamping part, will be set up to the polygon by the surface of clamping part, be favorable to using the instrument centre gripping by the clamping part, prevent to take place relative slip between central tube and the instrument.

Further, the outer surface of the clamped part is octagonal.

The beneficial effects are as follows: the octagonal structure can keep the wall thickness of the clamped part as much as possible, and the strength of the clamped part is improved.

Further, the exposed portion integrally constitutes the clamped portion.

The beneficial effects are as follows: the exposed part integrally forms a clamped part, so that the height of the upper end of the central tube exposed out of the outer cone sleeve can be reduced on one hand; on the other hand, the height of the clamped part can be maximized when the height of the outer taper sleeve exposed at the upper end of the central tube is fixed, and the clamped part can be clamped easily.

Furthermore, the outer cone sleeve is sleeved outside the central tube, a stop step which is used for being matched with the stop of the outer cone sleeve to prevent the outer cone sleeve from moving downwards is arranged on the central tube, and a limiting piece which is used for preventing the outer cone sleeve from moving upwards is detachably arranged on the central tube.

The beneficial effects are as follows: through setting up backstop step and locating part, can block outer cone cover on the center tube. Compared with the technical scheme that the outer taper sleeve is in threaded connection with the central pipe, the stop step is arranged, so that the step of loosening and tightening the threads between the outer taper sleeve and the central pipe can be omitted in the process of using the tubing hanger to set the tension packer, and the tubing hanger is more convenient to use; through connecting locating part detachably on the center tube, can avoid when overlapping outer cone cover on the center tube, locating part or backstop step and outer cone cover take place to interfere.

Furthermore, the limiting piece is a clamping ring, and the peripheral surface of the central tube is provided with an annular groove for clamping the clamping ring.

The beneficial effects are as follows: compared with the technical scheme that the threaded hole is formed in the central tube and the limiting piece is arranged on the bolt in the threaded hole, the clamping ring is simple in structure and easy to install and detach.

Still further, the snap ring includes the first snap ring and the second snap ring that the components of a whole that can function independently set up, and first snap ring and second snap ring pass through bolted connection.

The beneficial effects are as follows: the clamping ring is arranged to be a first clamping ring and a second clamping ring which are separated, so that the clamping ring can be conveniently installed and detached.

Furthermore, the outer peripheral surface of the clamping ring is a conical surface with gradually increased outer diameter from top to bottom, and the conical surface is used for being matched with a jackscrew on the large well head four-way joint so that the outer conical sleeve is fixed on the large well head four-way joint.

The beneficial effects are as follows: the outer peripheral surface of the clamping ring is designed to be a conical surface with gradually increased outer diameter from top to bottom, so that four jackscrews on a large four-way joint of a wellhead can be conveniently propped against the outer peripheral surface of the clamping ring, the pressure applied by the jackscrews to the clamping ring has a vertical downward component force, so that the force applied by the clamping ring to the annular groove (namely the central tube) has a vertical downward component force, the central tube and the stop step are driven to move downwards, and meanwhile, the force applied by the clamping ring to the outer taper sleeve also has a vertical downward component force, so that the whole outer taper sleeve and the central tube move downwards and are tightly sealed in the large four-way joint of the wellhead.

Furthermore, the upper end face of the outer taper sleeve and the lower end face of the clamping ring are both plane and are attached to each other.

The beneficial effects are as follows: compared with the technical scheme that the upper surface of the outer taper sleeve and the lower surface of the clamping ring are set to be mutually matched special-shaped surfaces (for example, the technical scheme that the lower surface of the clamping ring is provided with a bulge, the upper surface of the outer taper sleeve is provided with a groove matched with the bulge), the upper surface of the outer taper sleeve and the lower surface of the clamping ring are both set to be plane, and on one hand, the structure is simple and the processing is easy; on the other hand, when installing the snap ring, the snap ring does not need to be rotated to a certain specific position matched with the outer cone sleeve, and the installation is convenient.

Further, the maximum outer diameter of the lower end of the clamping ring is equal to the maximum outer diameter of the upper end of the outer taper sleeve.

The beneficial effects are as follows: the maximum outer diameter of the lower end of the clamping ring is equal to the maximum outer diameter of the upper end of the outer taper sleeve, so that the jackscrew can be conveniently jacked on the clamping ring.

Drawings

FIG. 1 is a schematic illustration of a prior art tension tubing hanger;

In fig. 1: 11. an outer cone sleeve; 12. a central tube; 13. female threads of the oil pipe; 14. an oil pipe male thread;

FIG. 2 is a schematic view of a tubing hanger according to embodiment 1 of the present utility model;

In fig. 2: 1. a central tube; 2. female threads; 3. a clasp; 4. an outer cone sleeve; 5. a copper ring; 6. a seal ring; 7. a stop step; 8. a male thread; 9. bolt holes; 10. and (5) connecting bolts.

Detailed Description

The present utility model is described in further detail below with reference to examples.

Specific embodiment 1 of tubing hanger provided by the utility model:

An object of this embodiment is to provide an oil pipe hanger that can avoid lifting nipple to drive central tube pivoted when installing lifting nipple on the central tube and removing lifting nipple from the central tube, through the upper end that makes the central tube form by the clamping part from protruding in the outer taper sleeve, can be when installing lifting nipple on the central tube and removing lifting nipple from the central tube conveniently fixed central tube, avoid the central tube to rotate to make oil pipe hanger use very conveniently.

As shown in fig. 2, this embodiment provides an oil pipe hanger, which includes a central pipe 1 vertically arranged in use and an outer cone sleeve 4 installed outside the central pipe 1, wherein the outer diameter of the upper part of the outer cone sleeve 4 is large, and the outer diameter of the lower part is small, so that the outer cone sleeve 4 is conveniently seated on the inner conical surface of a large four-way well head. The central tube 1 is of a central tube-shaped structure, and the outer diameter of the central tube 1 is slightly smaller than the inner diameter of the outer cone sleeve 4 so that a gap for facilitating the central tube 1 to pass through the outer cone sleeve 4 is reserved between the outer cone sleeve 4 and the central tube 1; the lower end of the central tube 1 is exposed from the outer cone sleeve 4 to form a connecting part for connecting with the last well-entering oil tube, and a male thread 8 is arranged on the outer surface of the connecting part; the inner surface of the upper end of the central tube 1 is provided with a female thread 2 for connecting with the lifting nipple, the upper end of the central tube 1 is provided with an exposed part exposed outside the outer cone sleeve 4, and the exposed part is provided with a clamped part for directly clamping and fixing the central tube 1 when the lifting nipple is installed or disassembled. In the present embodiment, the exposed portion integrally constitutes the clamped portion, and the outer surface of the clamped portion is octagonal, but in other embodiments, the clamped portion may be quadrangular, hexagonal, or other shapes as long as it can be clamped.

By exposing the upper end of the center tube 1 from the outer cone sleeve 4 and providing the clamped portion at the exposed portion, the center tube 1 can be directly clamped by the clamped portion when the lift sub is mounted on the center tube 1, thereby avoiding the center tube 1 from rotating; meanwhile, in the process of disassembling the lifting nipple after the tension packer is set, the clamping part is clamped, so that the rotation of the central tube 1 can be avoided, and the condition that the tension packer is not set tightly is avoided. To sum up, when using this tubing hanger, can prevent that center tube 1 from rotating at the in-process of installing the lift nipple on center tube 1, simultaneously, also can prevent that center tube 1 from rotating at the in-process of removing lift nipple from center tube 1, it is very convenient to use. For the outer surface of being the cylindrical technical scheme of clamping part, will be set up to the octagon by the surface of clamping part, be favorable to using the instrument centre gripping by the clamping part, prevent to take place relative slip between center tube 1 and the instrument. The exposed part is integrally formed into a clamped part, on one hand, the height of the upper end of the central tube 1 exposed out of the outer cone sleeve 4 can be reduced; on the other hand, when the height of the outer jacket 4 exposed at the upper end of the center tube 1 is fixed, the height of the clamped portion can be maximized, which is advantageous for clamping the clamped portion.

For the outer taper sleeve 4 of being convenient for install on center tube 1, outer taper sleeve 4 cover is established in the center tube 1 outside, be equipped with on the center tube 1 be used for with outer taper sleeve 4 backstop complex backstop step 7, still detachably installs on the center tube 1 be used for with backstop step 7 complex with fixed outer taper sleeve 4's locating part, in this embodiment, the locating part is snap ring 3, be equipped with the annular on the surface of center tube 1, snap ring 3 detachably installs in the annular, backstop step 7 can prevent outer taper sleeve 4 to move down, snap ring 3 can prevent outer taper sleeve 4 to upwards move to fix outer taper sleeve 4. The snap ring 3 includes the first snap ring 3 and the second snap ring 3 that the components of a whole that can function independently set up, is equipped with bolt hole 9 on first snap ring 3 and the second snap ring 3, and first snap ring 3 and second snap ring 3 can dismantle through bolt hole 9 and connecting bolt 10 and connect, in other embodiments, first snap ring 3 and second snap ring 3 can also be through the connection of tearing open such as pin, fixture block and connecting screw. The upper end face of the outer taper sleeve 4 and the lower end face of the snap ring 3 are both plane and are attached to each other, the outer peripheral face of the snap ring 3 is a conical surface with gradually increased outer diameter from top to bottom, the conical surface is used for being matched with a jackscrew on a large well head four-way joint so that the outer taper sleeve 4 is fixed on the large well head four-way joint, and the maximum outer diameter of the lower end of the snap ring 3 is equal to the maximum outer diameter of the upper end of the outer taper sleeve 4.

By providing the stop step 7 and the stop, the outer cone sleeve 4 can be clamped on the central tube 1. Compared with the technical scheme that the outer cone sleeve 4 and the central tube 1 are in threaded connection, the stop step 7 is arranged, so that the step of loosening and tightening the threads between the outer cone sleeve 4 and the central tube 1 can be omitted in the process of using the tubing hanger to seal the tension packer, and the tubing hanger is more convenient to use; by detachably connecting the limiting member to the central tube 1, interference between the limiting member or the stop step 7 and the outer cone sleeve 4 can be avoided when the outer cone sleeve 4 is sleeved on the central tube 1. Compared with the technical scheme that the threaded hole is formed in the central tube 1 and the limiting piece is provided with the bolt arranged in the threaded hole, the clamping ring 3 is simple in structure and easy to install and detach. The clamping ring 3 is arranged as the first clamping ring 3 and the second clamping ring 3 which are separated, so that the clamping ring 3 can be conveniently installed and detached. The outer peripheral surface of the clamping ring 3 is designed to be a conical surface with gradually increased outer diameter from top to bottom, so that four jackscrews on a large cross of a wellhead can be conveniently propped against the outer peripheral surface of the clamping ring 3, the pressure applied by the jackscrews to the clamping ring 3 has a vertical downward component, so that the force applied by the clamping ring 3 to an annular groove (namely the central tube 1) has a vertical downward component, the central tube 1 and the stop step 7 are driven to move downwards, and meanwhile, the force applied by the clamping ring 3 to the outer taper sleeve 4 also has a vertical downward component, so that the outer taper sleeve 4 and the central tube 1 integrally move downwards and are tightly seated in the large cross of the wellhead. Compared with the technical scheme that the upper surface of the outer taper sleeve 4 and the lower surface of the clamping ring 3 are set to be mutually matched special-shaped surfaces (for example, the lower surface of the clamping ring 3 is provided with a bulge, the upper surface of the outer taper sleeve 4 is provided with a groove matched with the bulge), the upper surface of the outer taper sleeve 4 and the lower surface of the clamping ring 3 are both set to be plane, and on one hand, the structure is simple and the processing is easy; on the other hand, when the snap ring 3 is installed, the snap ring 3 does not need to rotate to a certain specific position matched with the outer cone sleeve 4, and the installation is convenient. The maximum outer diameter of the lower end of the clamping ring 3 is equal to the maximum outer diameter of the upper end of the outer cone sleeve 4, so that the jackscrew can be conveniently propped against the clamping ring 3.

In order to ensure the sealing of the tubing hanger, in this embodiment, two red copper rings 5 and an "O" shaped sealing ring 6 disposed between the two red copper rings 5 are provided on the outer surface of the outer cone sleeve 4. At least two O-shaped sealing rings 6 are arranged between the outer taper sleeve 4 and the central tube 1, at least two sealing ring 6 mounting grooves are formed in the outer surface of the central tube 1, the sealing rings 6 are mounted in the sealing ring 6 mounting grooves, in the embodiment, two sealing rings 6 are arranged between the outer taper sleeve 4 and the central tube 1, the number of the sealing mounting grooves is two, but in other embodiments, the sealing mounting grooves and the sealing rings 6 mounted between the outer taper sleeve 4 and the central tube 1 can be other numbers.

A sealing ring 6 is arranged between the outer cone sleeve 4 and the central tube 1, so that a gap between the outer cone sleeve 4 and the central tube 1 can be sealed; the outer surface of the outer cone sleeve 4 is provided with the copper ring 5 and the sealing ring 6, so that a gap between the outer cone sleeve 4 and a wellhead large four-way joint can be sealed.

When the tension packer is set by using the oil pipe hanger in the embodiment, the clamping ring 3 is not installed, the lower end of the central pipe 1 is in threaded connection with the last well entering oil pipe, the central pipe 1 is fixed, and the upper end of the central pipe 1 is in threaded connection with the lifting nipple; then, lowering the oil pipe and making the central pipe 1 to be lowered into the well to a certain depth (the depth is calculated according to the setting distance of the tension packer and the elongation of the oil pipe); then, the central pipe 1 is rotated to realize the setting of the tension packer; then, lifting the lifting nipple to expose the annular groove on the central tube 1 from the wellhead large four-way joint, sleeving the outer taper sleeve 4 in place (even if the outer taper sleeve 4 is in stop fit with the stop step 7), and loading the clamping ring 3 into the annular groove; and finally, the oil pipe hanger is sealed in the wellhead large four-way joint, so that four jackscrews on the wellhead large four-way joint are propped against the outer peripheral surface of the clamping ring 3, the central pipe 1 is fixed, and the lifting nipple is removed. At this time, the in-well oil pipe applies a vertical downward force to the central pipe 1, the central pipe 1 applies a vertical downward force to the clamping ring 3 through the annular groove, the clamping ring 3 applies a vertical downward force to the outer cone sleeve 4 through the lower surface of the clamping ring 3, and the outer cone sleeve 4 applies a vertical downward force to the wellhead large cross through the outer surface of the outer cone sleeve 4, so that the oil pipe hanger is tightly seated on the wellhead large cross.

Specific example 2 of tubing hanger provided by the utility model:

The present embodiment is directed to providing a clamped portion with a different shape, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, the outer surface of the clamped portion is cylindrical, and the outer surface of the clamped portion is clamped by a tool, thereby preventing the center tube from rotating when the lift sub is mounted on and dismounted from the center tube.

Specific embodiment 3 of tubing hanger provided by the utility model:

The present embodiment aims to provide a clamped portion of another different shape, and the main difference between the present embodiment and the specific embodiment 1 is that: in this embodiment, at least two clamping holes are formed in the side wall of the clamped portion, and a tool is inserted into the clamping holes to clamp the clamped portion. In this case, the outer surface of the clamped portion may have any shape.

Specific example 4 of tubing hanger provided by the utility model:

The purpose of this embodiment is to provide a different clamped portion, and the main difference between this embodiment and embodiment 1 is that: in this embodiment, the upper end of the center tube has a large number of exposed portions exposed from the outer jacket, and one of the exposed portions is provided with an octagonal clamped portion, while the other exposed portion is a non-clamped portion.

Specific example 5 of tubing hanger provided by the utility model:

An object of the present embodiment is to provide a tubing hanger that does not include a stop step, and the main difference between the present embodiment and embodiment 1 is that: in this embodiment, the snap ring and the stop step are not included, and the outer cone sleeve is in threaded connection with the center tube.

Specific example 6 of tubing hanger provided by the present utility model:

The purpose of this embodiment is to provide a different limiting member, and the main difference between this embodiment and embodiment 1 is that: in this embodiment, the snap ring is not included, the upper end of the taper sleeve is provided with an outer peripheral surface for jacking a jackscrew on the large four-way joint of the wellhead, the taper sleeve is provided with a countersunk head fixing hole, the central tube is provided with a corresponding through hole, and the taper sleeve and the central tube are fixed by penetrating a pin into the countersunk head fixing hole and the through hole. When the tubing hanger in the embodiment is used, after the tension packer is set, the lifting nipple is lifted to enable the countersunk head fixing hole on the central tube to be exposed out of the large cross joint of the wellhead, the outer taper sleeve is sleeved in place (at the moment, the outer taper sleeve is matched with the stop step stop) and the countersunk head fixing hole and the through hole are aligned so that the pin penetrates into the countersunk head fixing hole and the through hole.

Specific example 7 of tubing hanger provided by the utility model:

The purpose of this embodiment is to provide a different snap ring, and the main difference between this embodiment and embodiment 1 is that: in this embodiment, the snap ring is an elastic collar for a shaft, and a notch is provided at one end of the snap ring, through which the snap ring is opened to snap the snap ring in the ring groove.

Specific example 8 of tubing hanger provided by the utility model:

The purpose of this embodiment is to provide a different connection mode of the snap ring, and the main difference between this embodiment and the specific embodiment 1 is that: in this embodiment, the both ends of first snap ring and second snap ring all are equipped with vertical through-hole, and fixed with first snap ring and second snap ring through the mounting of falling "U" shape, and wherein, the mounting of falling "U" shape includes two stands and a horizontal pole, and two stands are inserted respectively in the through-hole of first snap ring and second snap ring.

Specific example 9 of tubing hanger provided by the present utility model:

The objective of this embodiment is to provide an oil pipe hanger with a contact surface of an outer taper sleeve and a snap ring that is not planar, and the main difference between this embodiment and embodiment 1 is that: in this embodiment, a protrusion is provided on the lower surface of the snap ring, and a groove corresponding to the protrusion is provided on the upper surface of the outer cone sleeve, and when the snap ring is mounted, the protrusion is inserted into the groove to fixedly connect the snap ring and the outer cone sleeve. Through the recess and the arch of mutually supporting, can avoid snap ring and outer taper sleeve to take place relative slip in the circumferencial direction of snap ring effectively.

Embodiment 10 of the tubing hanger provided by the utility model:

The purpose of this embodiment is to provide a different snap ring, and the main difference between this embodiment and embodiment 1 is that: the outer peripheral surface of the clamping ring is a cylindrical surface, the upper end of the outer taper sleeve is provided with a conical surface matched with a jackscrew on a large well head four-way joint, and the clamping ring is clamped at the upper part of the outer taper sleeve to prevent the outer taper sleeve from moving upwards.

Specific example 11 of tubing hanger provided by the present utility model:

The purpose of this embodiment is to provide a different snap ring, and the main difference between this embodiment and embodiment 1 is that: the maximum outer diameter of the lower end of the snap ring is slightly smaller than the maximum outer diameter of the upper end of the outer taper sleeve, however, in other embodiments, the maximum outer diameter of the lower end of the snap ring may be slightly larger than the maximum outer diameter of the upper end of the outer taper sleeve, so long as the jackscrew can be guaranteed to prop against the outer circumferential surface of the snap ring.

Finally, it should be noted that the foregoing description is only a preferred embodiment of the present utility model, and the present utility model is not limited to the foregoing embodiments, but may be modified without inventive effort or equivalent replacement of some of the technical features thereof by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. The utility model provides an oil pipe hanger, include the center tube (1) of vertical setting and install at outside outer taper sleeve (4) of center tube (1) when using, the upper end of center tube (1) is provided with female screw (2) that are used for being connected with promotion nipple joint screw-thread fit, its characterized in that, the upper end of center tube (1) has the portion of exposing outside outer taper sleeve (4), is equipped with on the portion of exposing and is used for supplying center tube (1) to be directly by the fixed by the centre gripping when installing or dismantling the promotion nipple joint.

2. The tubing hanger of claim 1, wherein the outer surface of the gripped portion is polygonal.

3. The tubing hanger of claim 2 wherein the outer surface of the gripped portion is octagonal.

4. A tubing hanger according to any of claims 1-3, wherein the exposed portion integrally forms said gripped portion.

5. A tubing hanger as claimed in any one of claims 1 to 3, wherein the outer sleeve (4) is provided around the outside of the base pipe (1), the base pipe (1) being provided with a stop step (7) for co-operating with the stop of the outer sleeve (4) to prevent downward movement of the outer sleeve (4), and the base pipe (1) being further provided with a stop member for preventing upward movement of the outer sleeve (4).

6. The tubing hanger of claim 5, wherein the limiting member is a snap ring (3), and an annular groove into which the snap ring (3) is engaged is provided on an outer circumferential surface of the center tube (1).

7. The tubing hanger of claim 6, wherein the snap ring (3) comprises a first snap ring (3) and a second snap ring (3) that are separately provided, the first snap ring (3) and the second snap ring (3) being connected by a bolt.

8. The tubing hanger according to claim 6, wherein the outer circumference of the collar (3) is tapered with a gradually increasing outer diameter from top to bottom, the tapered surface being adapted to cooperate with a jackscrew on a large wellhead cross so as to secure the outer sleeve (4) to the large wellhead cross.

9. The tubing hanger according to claim 6, wherein the upper end surface of the outer cone sleeve (4) and the lower end surface of the snap ring (3) are planar and are in contact with each other.

10. Tubing hanger according to claim 8, characterized in that the maximum outer diameter of the lower end of the snap ring (3) is equal to the maximum outer diameter of the upper end of the outer cone sleeve (4).