A rotatable hydraulic liner hanger

Abstract

The utility model discloses a rotatable hydraulic tail pipe hanger, it includes from top to bottom connection's back in turn, setting and hanger body, the back is used for connecting the tool of sending and placing, the setting is used for transmitting torque, the hanger body includes mandrel, fixed sleeve, slip, rotary sliding mechanism and piston jar, the fixed sleeve installs in the mandrel outside, and it is opened to have the installation groove on it, the slip is installed in the installation groove, and its outer surface is located in the installation groove inside, the rotary sliding mechanism is used to make setting and the fixed sleeve with the mandrel can relatively rotate after hanging, the slip of the utility model adopts the design of built -in, namely the outer surface of slip is located in the installation groove of fixed sleeve, avoids the direct contact with the well wall or the last layer casing in the process of lowering, reduces the risk of jam. Meanwhile fixed sleeve and hanger body can relatively rotate through rotary sliding mechanism, and when cementing, rotation can greatly improve the cementing quality.

Description

Technical Field

[0001] This utility model relates to the field of oilfield downhole tools technology, specifically to a rotatable hydraulic tailpipe hanger. Background Technology

[0002] Tail tube cementing is the most commonly used method in deep well cementing. It can save casing and has significant economic benefits. It can simplify the well structure, improve the axial load conditions of the tubing string and improve drilling hydraulic conditions. In particular, it can greatly reduce the annular flow resistance during construction.

[0003] The hydraulic hanger is an important downhole tool in this process. It is mainly used to send the tailpipe to the designed depth and suspend it in the well wall or the upper casing to fix the tailpipe and facilitate subsequent operations (such as cementing).

[0004] Currently, the commonly used hydraulic hangers are generally slip-type hydraulic hangers, used to deliver and suspend the tailpipe. A seat and pressure ball seat needs to be installed below the pipe string, with the slips positioned on the outermost side of the entire hanger. After the tailpipe is lowered, a ball is dropped onto the pressure ball seat to suspend the tailpipe hanger, and the ball seat is circulated. During this process, the slips expand outward, and the carbide teeth or serrated teeth on their surface bite into the well wall (or the inner wall of the upper casing), forming a mechanical fixation. Then, the hanger is released by reverse clamping or hydraulic pressure, cementing is injected, and drill pipe rubber plugs are dropped from the wellhead to replace the slurry. The slurry reaches the hanger and combines with the tailpipe rubber plug, continuing to replace the cement slurry in the tailpipe section. The combined rubber plug is then pressed against the pressure ball seat to lift out the delivery tools and drill pipe.

[0005] However, during the well insertion process, such as in cementing operations with small gaps, the aforementioned hangers are highly susceptible to damage to the mounting mechanism and premature mounting accidents. Utility Model Content

[0006] The purpose of this invention is to provide a rotatable hydraulic tailpipe hanger to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, this utility model provides a rotatable hydraulic tailpipe hanger, which includes a return sleeve, a setting sleeve, and a hanger body connected sequentially from top to bottom. The return sleeve is used to connect the delivery and release tool, the setting sleeve is used to transmit torque, and the hanger body includes a mandrel, a fixed sleeve, slips, a rotary sliding mechanism, and a piston cylinder. The fixed sleeve is installed on the outside of the mandrel and has an installation groove. The slips are installed in the installation groove, and their outer surface is located inside the installation groove. The rotary sliding mechanism is used to allow the fixed sleeve and the mandrel to rotate relative to each other after the hanger is set. The piston cylinder is used to push the slips to radially expand and engage with the well wall or the inner wall of the upper casing.

[0008] Furthermore, the top of the chuck is provided with a conical sleeve fitted onto the mandrel, and the conical sleeve is mounted on the fixed sleeve.

[0009] Furthermore, the clasp and the conical sleeve are arranged in a one-to-one correspondence as a set, and multiple sets are connected end to end along the longitudinal direction of the mounting groove.

[0010] Furthermore, there are multiple mounting slots, and each of the multiple mounting slots is provided with the clip and the conical sleeve.

[0011] Furthermore, the spindle and the piston cylinder are connected by a mounting pin.

[0012] Furthermore, the top of the seat cylinder is provided with a torque transmission groove.

[0013] Furthermore, a connecting suspension groove is provided below the torque transmission groove.

[0014] The beneficial effects of this utility model are as follows: The slips of this utility model adopt an internal design, that is, the outer surface of the slips is located inside the mounting groove of the fixing sleeve, avoiding direct contact with the well wall or the upper casing during the lowering process, thus reducing the risk of jamming. At the same time, the fixing sleeve and the suspension body can rotate relative to each other through a rotating sliding mechanism, which can greatly improve the cementing quality during cementing. Attached Figure Description

[0015] Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0016] The components include: 1. return sleeve; 2. seat seal sleeve; 3. suspension body; 4. seat start pin; 5. torque transmission groove; 6. connecting suspension groove.

[0017] 31. Mandrel; 32. Fixed sleeve; 33. Collet; 34. Rotary sliding mechanism; 35. Piston cylinder; 36. Conical sleeve. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only one embodiment of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] To make the objectives, technical solutions and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0020] In the following description, references to "an embodiment," "an embodiment," "an example," "example," etc., indicate that the described embodiment or example may include a particular feature, structure, characteristic, property, element, or limitation, but not every embodiment or example necessarily includes that particular feature, structure, characteristic, property, element, or limitation. Furthermore, the repeated use of the phrase "an embodiment according to this application," while possibly referring to the same embodiment, does not necessarily refer to the same embodiment.

[0021] like Figure 1 As shown, this utility model discloses a rotatable hydraulic tailpipe hanger, which includes a return cylinder 1, a setting cylinder 2, and a hanger body 3 connected sequentially from top to bottom. The return cylinder 1 is used to connect the delivery and release tools, the setting cylinder 2 is used to transmit torque, and the hanger body 3 includes a spindle 31, a fixing sleeve 32, a slip 33, a rotary sliding mechanism 34, and a piston cylinder 35. The fixing sleeve 32 is installed on the outside of the spindle 31 and has an installation groove. The slip 33 is installed in the installation groove and its outer surface is located inside the installation groove. The rotary sliding mechanism 34 is used to allow the fixing sleeve 32 and the spindle 31 to rotate relative to each other after the hanger is set. The piston cylinder 35 is used to push the slip 33 to expand radially and engage with the well wall or the inner wall of the upper casing.

[0022] The Kawa 33 adopts an internal design (its outer surface is located inside the mounting groove of the fixed sleeve 32), which avoids direct contact with the well wall or the upper casing during the lowering process and reduces the risk of jamming.

[0023] The rotating sliding mechanism 34 allows the fixed sleeve 32 and the mandrel 31 to rotate relative to each other after the hanger is engaged, enabling the tailpipe string to rotate after engagement. This rotation significantly improves cementing quality during cementing. Specifically, after the hanger is engaged and the cement slurry is circulated and displaced, the rotating sliding mechanism 34 can rotate the entire tailpipe string, resulting in higher and more thorough displacement of the cement slurry during its return through the annulus, thus greatly improving cementing quality. In this embodiment, the rotating sliding mechanism 34 can be a bearing.

[0024] The bottom of the suspension body 3 is connected to the tailpipe string, and the delivery tool is connected to the return cylinder 1 and the setting cylinder 2 of the suspension. The tailpipe is delivered to the design depth for setting.

[0025] The slip 33 of this invention adopts an internal design, meaning that the outer surface of the slip 33 is located inside the mounting groove of the fixing sleeve 32, avoiding direct contact with the well wall or the upper casing during the lowering process and reducing the risk of jamming. At the same time, the fixing sleeve 32 and the hanger body 3 can rotate relative to each other through the rotary sliding mechanism 34, and the rotation during cementing can greatly improve the cementing quality.

[0026] In one embodiment, the slip 33 has a conical sleeve 36 fitted onto the mandrel 31 at its top, and the conical sleeve 36 is mounted on the fixed sleeve 32. That is, under the push of the piston cylinder 35, the slip 33 expands along the outer surface of the conical sleeve 36, thereby causing the carbide teeth on the outer surface of the slip 33 to bite into the well wall or the inner wall of the casing.

[0027] In one embodiment, the slips 33 and conical sleeves 36 are arranged in a one-to-one correspondence, and multiple sets are connected end-to-end along the longitudinal direction of the mounting groove. Each set consists of one conical sleeve 36 and one slip 33, which engage through the conical surface of the conical sleeve 36 to form an independent transmission-engagement unit. When the piston cylinder 35 pushes the last slip 33 to expand, the multiple sets of slips 33 at its front end expand and engage sequentially, forming a "stepped" support. When a single set of slips 33 fails, the remaining sets can still bear the load.

[0028] In one embodiment, there are multiple mounting slots, each equipped with a slip 33 and a conical sleeve 36. This further improves the seating reliability of the suspension.

[0029] In one embodiment, the spindle 31 and the piston cylinder 35 are connected by a seat-mounted starting pin 4, which realizes the timing controllability and operational reliability of seat-mounted starting.

[0030] In one embodiment, the top of the setting cylinder 2 is provided with a torque transmission groove 5 for transmitting rotational torque.

[0031] If obstruction is encountered during the lowering process, the external rotating tool can be connected to the torque transmission groove 5 to transmit torque and rotate the entire tail string to eliminate the obstruction.

[0032] In one embodiment, a connecting suspension groove 6 is provided below the torque transmission groove. It serves to connect the tailpipe string during lowering. After the suspension device is engaged, the connecting mechanism of the delivery tool and the suspension device can be released from the hand by hydraulic or mechanical means.

[0033] The above description of the disclosed embodiments enables those skilled in the art to implement or use this invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, this invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A rotatable hydraulic liner hanger, characterized by: The device includes a return sleeve, a setting sleeve, and a suspension body connected sequentially from top to bottom. The return sleeve is used to connect the delivery and release tools, the setting sleeve is used to transmit torque, and the suspension body includes a mandrel, a fixed sleeve, slips, a rotary sliding mechanism, and a piston cylinder. The fixed sleeve is installed on the outside of the mandrel and has an installation groove. The slips are installed in the installation groove, and their outer surface is located inside the installation groove. The rotary sliding mechanism is used to allow the fixed sleeve and the mandrel to rotate relative to each other after the device is set. The piston cylinder is used to push the slips to expand radially and engage with the well wall or the inner wall of the upper casing.

2. A rotatable hydraulic liner hanger as defined in claim 1, wherein: The top of the chuck is provided with a conical sleeve that is fitted onto the mandrel, and the conical sleeve is mounted on the fixed sleeve.

3. A rotatable hydraulic liner hanger as defined in claim 2, wherein: The clasp and the conical sleeve are arranged in a one-to-one correspondence as a set, and multiple sets are connected end to end along the longitudinal direction of the mounting groove.

4. A rotatable hydraulic liner hanger as defined in claim 3, wherein: There are multiple mounting slots, and each of the multiple mounting slots is provided with the clip and the conical sleeve.

5. A rotatable hydraulic liner hanger as defined in claim 1, wherein: The spindle and the piston cylinder are connected by a mounting pin.

6. A rotatable hydraulic liner hanger as defined in claim 1, wherein: The top of the sealing cylinder is provided with a torque transmission groove.

7. A rotatable hydraulic liner hanger as defined in claim 6, wherein: A connecting suspension groove is provided below the rectangular transmission groove.

Images