Super-tension casing hanger

Abstract

The utility model discloses a super-tension casing hanger, which relates to the technical field of casing hangers and comprises a hanging casing, and a threaded casing is mounted at the bottom of the hanging casing. When the super-tension casing hanger is used, a suspension casing can be in butt joint with a tension hanger feeding tool, a taking and feeding tool mounting channel on the outer side of the suspension casing is aligned with an L-shaped groove of the tension hanger feeding tool, and at the moment, the suspension casing can be connected with the tension hanger feeding tool; then the tension hanger feeding tool is rotated, so that the tension hanger feeding tool is connected under the cooperation of the torque block and the L-shaped groove of the tension hanger feeding tool, a user can conveniently and rapidly install the hanging sleeve and the tension hanger feeding tool, and a non-threaded connection mode is adopted; the situation that the threaded opening is damaged under the high stress condition can be avoided, and meanwhile the situation that a casing string is reversely buckled is not prone to occurring.

Description

Technical Field

[0001] The utility model relates to the technical field of casing hangers, in particular to a super-tension casing hanger. Background Technique

[0002] A tubing hanger is a device that supports the tubing string and seals the annular space between the tubing and the casing. Generally, it is divided into two types according to the style, namely the slip-type casing hanger and the mandrel-type casing hanger. The two types of casing hangers can be used according to customer requirements and actual working conditions.

[0003] In order to make the connection between the existing casing hanger and the casing hanger picking and delivering tool more stable, when connecting with the casing hanger picking and delivering tool, threads are usually used for connection. When the casing hanger is moved up and down and rotated, there will be very high stress at the thread connection, and at this time, it is very easy to cause damage to the thread port, so that the casing hanger picking and delivering tool cannot be taken out, and it is easy to cause the casing string to be reversed. Content of the Utility Model

[0004] The purpose of the utility model is to provide a super-tension casing hanger to solve the problems in the above background technique that when the currently used casing hanger is connected by a threaded connection method, it is easy to cause damage to the thread port or cause the casing string to be reversed, thus affecting the normal use of the casing hanger.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A super-tension casing hanger, comprising: a hanging casing, and a threaded casing is installed at the bottom of the hanging casing.

[0006] Preferably, a picking and delivering tool installation channel is installed on the outer side of the hanging casing, and a torque block is installed on the outer side of the picking and delivering tool installation channel.

[0007] Preferably, a bearing step is arranged at the bottom of the picking and delivering tool installation channel, and liquid return grooves are formed around the bearing step.

[0008] Preferably, the picking and delivering tool installation channel, the bearing step and the hanging casing are of an integrated structure.

[0009] Compared with the prior art, the beneficial effects of the present utility model are as follows: When the super-tension casing hanger is in use, the hanging casing and the tension hanger feeding tool can be docked, and the installation channel for the picking and delivering tool on the outer side of the hanging casing is aligned with the L-shaped groove of the tension hanger feeding tool. At this time, the hanging casing and the tension hanger feeding tool can be connected. Then, rotate the tension hanger feeding tool so that the tension hanger feeding tool is connected under the cooperation of the torque block and the L-shaped groove of the tension hanger picking and delivering tool, thereby facilitating the user to quickly install the hanging casing and the tension hanger feeding tool. And the non-threaded connection method can avoid damage to the thread at the high stress, and at the same time, the casing string is not prone to reverse threading. This is the usage feature of the super-tension casing hanger. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0011] Figure 2 is a top-view structural schematic diagram of the present utility model;

[0012] Figure 3 is a front-view sectional structural schematic diagram of the present utility model.

[0013] In the figure: 1, hanging casing; 2, threaded casing; 3, installation channel for picking and delivering tool; 4, torque block; 5, bearing step; 6, liquid return groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0014] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0015] Please refer to Figure 1 With Figure 3 , the present utility model provides a technical solution: A super-tension casing hanger, comprising: a hanging casing 1, and a threaded casing 2 is installed at the bottom of the hanging casing 1.

[0016] An installation channel 3 for picking and delivering tool is installed on the outer side of the hanging casing 1, a torque block 4 is installed on the outer side of the installation channel 3 for picking and delivering tool, a bearing step 5 is arranged at the bottom of the installation channel 3 for picking and delivering tool, liquid return grooves 6 are opened on all sides of the bearing step 5, the installation channel 3 for picking and delivering tool, the bearing step 5 and the hanging casing 1 are of an integrated structure, and four groups of torque blocks 4 are symmetrically installed about the center line of the hanging casing 1.

[0017] During specific implementation, when using this over-tension casing hanger, in the first step, the upper end of the tension hanger picking and placing tool can be connected to the casing nipple, and then connected to the top drive or drill pipe of the drilling rig. The L-shaped block installation channel of the tension hanger picking and placing tool is aligned with the L-shaped groove of the picking and placing tool installation channel 3. Then, the tension hanger picking and placing tool is moved downward to the bearing step 5, and then the tension hanger picking and placing tool is rotated clockwise by 90°. The torque block 4 of the hanging casing 1 is installed in the L-shaped groove of the tension hanger picking and placing tool. The tension hanger picking and placing tool is lifted, so that the lower plane of the torque block 4 on the hanging casing 1 contacts the bottom plane of the L-shaped groove. The L-shaped groove of the tension hanger picking and placing tool is designed with a stop block to prevent the tension hanger from disengaging from the picking and placing tool;

[0018] In the second step, the tension hanger feeding tool can be rotated clockwise again. Under the action of the torque block 4, the threaded casing 2 at the lower part of the hanging casing 1 is connected to the main wellhead casing;

[0019] In the third step, when cementing the wellhead, before the cement solidifies, the hanging casing 1 can be moved up and down, and at the same time, the casing string can be rotated clockwise. Such operation can greatly improve the cementing quality of the cement. During the process of moving the hanging casing 1 up and down and rotating, the hanging casing 1 and the picking and placing tool have to bear high axial stress and circumferential torque. At this time, if the connection is made by means of threads, under the action of high stress, there will be thread bite or damage, which is likely to cause the picking and placing tool to be unable to be taken out;

[0020] In the fourth step, after completing the operation of the third step, the bearing step 5 of the hanging casing 1 is placed on the wellhead, and then the tension hanger picking and placing tool is lowered so that the lower end face of the picking and placing tool contacts the top plane of the bearing step 5, and the tension hanger picking and placing tool is rotated counterclockwise by 90°, and the tension hanger picking and placing tool can be taken out. Since the hanging casing 1 and the picking and placing tool are non-threadedly connected, when the picking and placing tool is taken out counterclockwise, the risk that the threaded connection may cause the casing string to reverse is reduced.

[0021] Refer to Figure 1 、 Figure 2 And Figure 3 It can be known that during use, the hanging casing 1 can be docked with the hanger picking and placing tool, and the torque block 4 and the L-shaped block are used for docking between the hanging casing 1 and the hanger picking and placing tool, so that the situation that the thread opening may be damaged under high stress between the hanging casing 1 and the hanger picking and placing tool can be avoided, and at the same time, the risk that the threaded connection may cause the casing string to reverse is also avoided.

[0022] In summary, when the super-tension casing hanger is in use, the upper end of the tension hanger delivery tool can be connected to the casing short circuit, and then connected to the top drive or drill pipe of the drilling rig, and the L-shaped block installation channel of the tension hanger delivery tool is aligned with the L-shaped groove of the delivery tool installation channel 3. After the tension hanger delivery tool is connected to the suspension casing 1, the tension hanger delivery tool is rotated 90° clockwise so that the torque block 4 is installed in the L-shaped groove of the tension hanger delivery tool, and the tension hanger delivery tool is rotated at the same time so that the bottom of the suspension casing 1 is connected to the wellhead main pipe through the threaded casing 2, and then the suspension casing 1 is continuously moved up and down while the casing main pipe is rotated, so that the cementing effect of the cement can be increased, and finally the tension hanger delivery tool can be removed. This is the use feature of the super-tension casing hanger. The content not described in detail in this specification belongs to the prior art known to professional and technical personnel in this field.

[0023] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. An ultra-tension casing hanger, comprising: A hanging sleeve (1), characterized in that a threaded sleeve (2) is installed at the bottom of the hanging sleeve (1); A pick-up and delivery tool installation channel (3) is installed on the outside of the hanging sleeve (1), a torque block (4) is installed on the outside of the pick-up and delivery tool installation channel (3), a bearing step (5) is arranged at the bottom of the pick-up and delivery tool installation channel (3), and liquid return grooves (6) are arranged around the bearing step (5), and the pick-up and delivery tool installation channel (3), the bearing step (5) and the hanging sleeve (1) are an integrated structure.

Images