CN108729872B

CN108729872B - Novel casing hanger

Info

Publication number: CN108729872B
Application number: CN201810494100.2A
Authority: CN
Inventors: 弓大为
Original assignee: Shanghai Xiawei Petroleum Equipment Technology Service Co ltd
Current assignee: Shanghai Xiawei Petroleum Equipment Technology Service Co ltd
Priority date: 2018-05-22
Filing date: 2018-05-22
Publication date: 2024-06-04
Anticipated expiration: 2038-05-22
Also published as: CN108729872A

Abstract

The invention relates to the technical field of petroleum well sealing devices, in particular to a novel casing hanger. The casing hanger is provided with a bearing lock ring, a support ring and an actuating pin, the upper part of the casing hanger is provided with a wellhead lock ring groove, the bearing lock ring is arranged right above the support ring, the bearing lock ring is provided with a bearing lock ring bearing step and a support step, the support ring is provided with a support ring lock groove and a support ring bottom, the support ring bottom is positioned at the bottommost end of the support ring, the support ring lock groove is internally provided with a hanging lock ring, the bottom surface of the actuating pin is in contact extrusion with the top of the previous casing hanger, and one side of the actuating pin is provided with a lock pin. The invention provides a novel sleeve hanger which can ensure that sleeve hangers and support rings are locked in place in the process of lowering and are easy to disengage after being in place, and can avoid the problems of disengaging all support pins and sitting in advance when the sleeve hangers are partially blocked.

Description

Novel casing hanger

Technical Field

The invention relates to the technical field of petroleum well sealing devices, in particular to a novel casing hanger.

Background

In the oil drilling and completion wellhead equipment, a casing hanger is needed for supporting each layer of casing, a sitting and hanging step is needed for installing the casing hanger, if each layer of casing head is only hung by sitting and hanging one casing hanger, only the sitting and hanging step is needed to be provided on the casing head, and the step also needs to bear the weight of the casing of the layer. However, if a multifunctional casing head, particularly an underwater casing head, is adopted, more than two casing hangers are required to be installed in the casing head, at least more than three casing hangers are required to be selected in the deep water drilling and completion wellhead equipment, and products on the market at present are all selected to be single bearing steps, and all the casing hangers are stacked and installed, so that the bearing steps of the casing head are required to be made of special materials, and difficulty is brought to material selection processing.

Therefore, a novel sleeve hanger which can ensure that the sleeve hanger and the supporting ring are locked in place in the process of lowering and are easy to disengage after being in place and can avoid the problems of disengaging all supporting pins and sitting and hanging in advance when being blocked locally is urgently needed.

Disclosure of Invention

In view of the above problems, the invention provides a novel sleeve hanger which can ensure that sleeve hangers and support rings are locked in place in the process of lowering and are easy to disengage after being in place, and can avoid the problems of disengaging all support pins and hanging in advance when local obstruction occurs.

In order to achieve the above object, the present invention provides the following technical solutions:

The invention relates to a novel sleeve hanger, which is arranged at a wellhead, wherein a lock ring groove is arranged at the upper part of the wellhead, a bearing lock ring, a support ring and an actuating pin are arranged on a sleeve hanger, the wellhead lock ring groove is arranged at the upper part of the sleeve hanger, an outer contour surface and a sleeve hanger step surface are also arranged on the sleeve hanger, the outer contour surface is a vertical contact surface, the outer contour surface can support the inner surface of the bearing lock ring, the sleeve hanger step surface is an inclined contact surface, the bearing lock ring is arranged right above the support ring, the bearing lock ring is provided with a bearing lock ring bearing step and a support step, the support step is in matched contact with the wellhead lock ring groove, the support ring is provided with a support ring lock groove and a support ring bottom, the support ring bottom is positioned at the bottommost end of the support ring, the support ring lock groove is internally provided with a suspension lock ring, the bottom of the actuating pin is called an actuating pin bottom surface, the actuating pin bottom surface is in contact with the upper layer of the hanger top, and one side of the actuating pin is provided with a lock pin.

Further, a shear pin is also provided on the upper portion of the support ring, which may be used to verify that the hanger is in place.

Furthermore, the wellhead locking ring groove is in a zigzag shape.

Further, the contact surface between the bottom surface of the actuating pin and the top of the sleeve hanging part of the upper layer is an inclined contact surface.

Furthermore, the sleeve hanger, the bearing lock ring, the supporting ring, the shearing pin, the locking pin and the actuating pin are all made of corrosion-resistant alloy steel.

The invention has the advantages and beneficial effects that: the novel sleeve hanger can ensure that the sleeve hanger and the supporting ring are locked in the process of lowering and are easy to disengage after being in place, and the problems that all supporting pins are disengaged and the sleeve hanger is sat in advance when the sleeve hanger is partially blocked are avoided.

The design utilizes the cooperation of the supporting pin and the actuating pin, thereby ensuring that the sleeve hanger and the supporting ring are locked in the process of lowering and are easy to be disengaged after being in place; the single design of the actuating pin can avoid partial blockage and can not disengage all supporting pins, so that the early sitting and hanging are avoided; the design of the shearing pin 11 can check whether the shearing pin is in place or not, and the shearing pin can shear and take off hands when the shearing pin is recovered; the suspension ring can push the support ring to move downwards in the process of lowering, and the support ring can be suspended for recovery together during recovery.

Drawings

In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.

FIG. 1 is a schematic illustration of a novel casing hanger configuration.

Description of the reference numerals

1.2 Parts of wellhead, 3 parts of casing hanger, 4 parts of wellhead locking ring groove, 5 parts of outer contour surface and step surface of casing hanger

6. Bearing lock ring bearing step 7, wellhead lock ring groove 8, bearing lock ring 9, support step

10. Support ring 11, shear pin 12, suspension locking ring 13, support ring locking groove 14, locking pin

15. Actuator pin 16. Upper sleeve hanger top 17. Actuator pin bottom 18. Support ring bottom

Detailed Description

The following describes the embodiments of the present invention further with reference to the drawings and examples. The following examples are only for more clearly illustrating the technical aspects of the present invention, and are not intended to limit the scope of the present invention.

A novel casing hanger is shown in figure 1, the casing hanger is arranged at a wellhead 1, a lock ring groove 7 is arranged at the upper part of the wellhead 1, and the lock ring groove 7 of the wellhead is in a zigzag shape. The casing hanger 2 is provided with a bearing lock ring 8, a support ring 10 and an actuating pin 15, the upper part of the casing hanger 2 is provided with a wellhead lock ring groove 3, the casing hanger 2 is also provided with an outer contour surface 4 and a casing hanger step surface 5, the outer contour surface 4 is a vertical contact surface, the outer contour surface 4 can support the inner surface of the bearing lock ring 8, the casing hanger step surface 5 is an inclined contact surface, the bearing lock ring 8 is arranged right above the support ring 10, the bearing lock ring 8 is provided with a bearing lock ring bearing step 6 and a support step 9, the support step 9 is in matched contact with the wellhead lock ring groove 7, the support ring 10 is provided with a support ring lock groove 13 and a support ring bottom 18, the support ring bottom 18 is positioned at the bottommost end of the support ring 10, the support ring lock groove 13 is internally provided with a hanging lock ring 12, the bottom of the actuating pin 15 is called an actuating pin bottom surface 17, the actuating pin bottom surface 17 is in contact extrusion with the casing hanger top 16 of the previous layer, and the contact surface of the actuating pin bottom 17 and the casing hanger top 16 of the previous layer is an inclined contact surface. One side of the actuating pin 15 is provided with a locking pin 14. The upper part of the support ring 10 is also provided with a shear pin 11, which shear pin 11 can be used to check whether the casing hanger 2 is in place. The casing hanger 2, the bearing lock ring 8, the support ring 10, the shear pin 11, the locking pin 14 and the actuating pin 15 are all made of corrosion-resistant alloy steel.

The support ring 10 is hung on the body of the casing hanger 2 through the shearing pin 11 in the process of lowering the casing hanger 2, the support ring 8 is placed on the top of the support ring 10, meanwhile, the support ring 10 is locked on the body of the casing hanger 2 through the locking pin 14, when the actuating pin bottom surface 17 is contacted with the top 16 of the previous casing hanger and pressed into the support ring 10 along with the lowering of the casing hanger 2, the locking pin 14 is pressed back into a groove of the locking pin by the actuating pin 15 until the bottom 18 of the support ring is contacted with the top 16 of the previous casing hanger, so that the casing hanger 2 is separated from the support ring 10, the support ring 10 is fixed, the casing hanger 2 can be continuously lowered under the action of gravity, the support ring 8 is pushed to move outwards by the sleeve hanger step surface 5 until the support step 9 of the support ring 8 is pressed into the annular groove 7 along with the lowering of the casing hanger 2, at the moment, the profile surface 4 of the casing hanger 2 is supported on the inner surface of the support ring 8, the support ring step 6 is pressed into the support ring, the support ring 11 is pressed into the support ring groove along with the downward movement of the support ring 2 along with the lowering of the support ring 11, the support ring 10 is pressed into the support ring 10 along with the downward movement of the support ring, and the support ring 12 is pressed into the annular groove along with the downward movement of the support ring 10.

After the casing hanger 2 is lowered, the casing hanger 2 can be lifted up to check whether the casing hanger 2 is in place, and the bearing force at this time depends on the supporting force of the shear pin 11. If it is necessary to provide a shearing force exceeding the shearing pin 11 at the time of recovering the casing hanger 2, the shearing pin 11 is sheared, and the supporting ring 10 and the carrier locking ring 8 are recovered together by the hanging ring 12. Because of the different steps in the wellbore during running of the casing string 2, the support pins 14 can only be disengaged if the casing string is fully in place compressing all the actuation pins in place in order to prevent the casing string from being set up in advance by designing the actuation pins 15 to be single-acting.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.

Claims

1. The casing hanger is arranged at a wellhead, the upper part of the wellhead is provided with a wellhead lock ring groove, and is characterized in that the casing hanger is provided with a bearing lock ring, a support ring and an actuating pin, the upper part of the casing hanger is provided with a bearing step, the wellhead lock ring groove is in a saw-tooth shape, the casing hanger is also provided with an outer contour surface and a casing hanging step surface, the outer contour surface is a vertical contact surface, the outer contour surface can support the inner surface of the bearing lock ring, the casing hanging step surface is an inclined contact surface, the bearing lock ring is arranged right above the support ring, the bearing lock ring is provided with a bearing lock ring bearing step and a support step, the support step is in matched contact with the wellhead lock ring groove, the support ring is provided with a support ring lock groove and a support ring bottom, the support ring bottom is positioned at the bottommost end of the support ring, the support ring lock groove is internally provided with a hanging lock ring, the actuating pin bottom is called an actuating pin bottom surface, the actuating pin bottom surface is in contact extrusion with one side of the upper layer of the hanging top, and one side of the actuating pin is provided with a sleeve lock ring;

The upper portion of holding ring still is equipped with the shear pin, the shear pin can be used to check whether the sleeve string is gone into in place, hang on the body of sleeve string through the shear pin in the in-process of hanging down the sleeve, the bearing catch is placed at the top of holding ring, simultaneously the holding ring passes through the locking pin lock on the body of sleeve string, along with the sleeve string is put down together, when the actuating pin bottom surface and last layer sleeve string top contact and impress the holding ring, the actuating pin presses the locking pin back into the groove of locking pin this moment, until the holding ring bottom and last layer sleeve string top contact, make sleeve string and holding ring disconnect, at this moment the holding ring is fixed, the sleeve string can continue to be put down under the effect of gravity, the holding ring is pushed outward to the holding ring face of holding down simultaneously, at this moment the outer contour face of holding ring supports in the internal surface of holding ring, the holding ring of holding ring holds the step department, the shearing pin can move down in the holding ring groove in this process, the effect of hanging ring with holding ring is pressed back the holding ring, the holding ring is pressed back in the groove in order to prevent that the effect of hanging down the sleeve pin is single in order to prevent to take off the effect of supporting ring, the effect of compressing only in order to prevent that the effect of hanging from just supporting pin from taking off.

2. The casing hanger of claim 1, wherein the contact surface of the bottom surface of the actuator pin with the top of the previous casing hanger is an angled contact surface.

3. The casing hanger of claim 1, wherein the casing hanger, load lock ring, support ring, shear pin, locking pin, and actuating pin are all made of corrosion resistant alloy steel.