Non-welded quick-mounting sleeve cement head

Abstract

This invention belongs to the field of cementing tool technology, specifically relating to a non-welded quick-connect casing cement head. The non-welded quick-connect casing cement head includes, from left to right, a top cover, a cylinder, a lower connector, a chuck body, and a quick-connect coupling. A sealing assembly is provided inside the lower connector. The quick-connect coupling connects to the cementing casing. After the cementing casing extends into the quick-connect coupling, it axially abuts against the sealing assembly to form a seal. A union joint is located on the cylinder wall. The union joint has a sealing step that abuts against the cylinder and a connecting thread for connecting the union shell. The union shell and the sealing step abut against the inner and outer sides of the cylinder, respectively.

Description

Technical Field

[0001] This invention belongs to the field of cementing tool technology, specifically, it relates to a non-welded quick-installation casing cement head. Background Technology

[0002] With the continuous development of drilling technology, deep and ultra-deep wells have become an important direction for oil and gas development, and the cementing operation environment is becoming increasingly complex. Among them, the cement head, as one of the key pieces of equipment in cementing operations, requires operators to perform tasks such as tool installation, plug release, and manifold switching at the wellhead, which places higher demands on the overall safety and ease of operation of the casing cement head.

[0003] The cement head cylinder needs to be connected to the injection pipe. The existing connection method typically involves welding a union connector to the injection port of the cylinder, which is then connected to the injection manifold via the union. However, this welding process not only limits the choice of cylinder material but also makes it impossible to fully detect internal weld defects, posing a risk in its use.

[0004] Therefore, there is an urgent need to develop a quick-install cement head sleeve that does not require welding. Summary of the Invention

[0005] To address the technical problems mentioned above, this invention aims to provide a non-welded quick-installation sleeve cement head, which can achieve a sealed connection between the union joint and the cylinder without welding, and the overall assembly process is quick and convenient.

[0006] According to the present invention, a non-welded quick-connect casing cement head is provided, comprising a top cover, a cylinder, a lower connector, a chuck body, and a quick-connect coupling connected sequentially from left to right. A sealing assembly is provided inside the lower connector. The quick-connect coupling is connected to the cementing casing. After the cementing casing extends into the quick-connect coupling, it axially abuts against the sealing assembly to form a seal. A union joint is provided on the cylinder wall. The union joint is provided with a sealing step that can abut against the cylinder and a connecting thread for connecting the union shell. The union shell and the sealing step abut against the inner and outer sides of the cylinder, respectively.

[0007] In one specific embodiment, the cylinder is provided with a union hole for passing through the union connector, at least a portion of the union hole is provided as a conical surface, and the union connector is provided with a conical surface adapted to the conical surface of the union hole.

[0008] In one specific embodiment, an anti-rotation mechanism is provided on the union connector, the anti-rotation mechanism being configured to adapt to the union hole, thereby preventing the union connector from rotating relative to the union hole.

[0009] In one specific embodiment, the anti-rotation mechanism includes at least one anti-rotation key disposed on the outer wall of the union joint, and an anti-rotation groove for adapting the anti-rotation key is disposed on the inner wall of the union joint hole.

[0010] In one specific embodiment, a mounting groove for installing the anti-rotation key is provided on the outer wall of the union joint.

[0011] In one specific embodiment, a first sealing element is provided between the union joint and the union hole.

[0012] In one specific embodiment, the first seal is located between the mounting groove and the sealing step.

[0013] In one specific embodiment, a second seal is provided between the union connector and the union housing.

[0014] In one specific embodiment, the second seal is located between the connecting thread and the mounting groove.

[0015] In one specific embodiment, the end of the sealing step is configured as an arc surface with the same curvature as the inner wall of the cylinder.

[0016] Compared with the prior art, the advantages of this application are as follows.

[0017] The union connector of the present invention has a sealing step and a connecting thread at both ends. After the end of the union connector with the connecting thread is inserted into the union hole of the cylinder, the sealing step can abut against the cylinder. Then, the union shell is set on the union connector through the connecting thread, and the union shell can abut against the cylinder. The union shell and the sealing step work together to seal and fix the union connector in the union hole of the cylinder. Attached Figure Description

[0018] The invention will now be described with reference to the accompanying drawings.

[0019] Figure 1 A schematic diagram of an embodiment of a non-welded quick-connect sleeve cement head provided according to the present invention is shown;

[0020] Figure 2 An enlarged schematic diagram of the union joint portion provided according to the present invention is shown;

[0021] Figure 3 This shows a cross-sectional structural schematic diagram of an embodiment of a union joint provided according to the present invention;

[0022] Figure 4 A three-dimensional structural schematic diagram of an embodiment of a union joint provided according to the present invention is shown.

[0023] In the picture:

[0024] 1. Union connector; 10. Curved surface; 11. Sealing step; 12. Connecting thread;

[0025] 13. Anti-rotation mechanism; 131. Anti-rotation key; 132. Mounting slot;

[0026] 14. First sealing element; 141. First sealing groove;

[0027] 15. Second seal; 151. Second sealing groove;

[0028] 161. First chamfer; 162. Second chamfer; 163. Sealing cone surface;

[0029] 17. First joint section; 18. Second joint section; 19. Third joint section;

[0030] 2. Cylinder body; 21. Union joint hole; 211. Anti-rotation groove; 212. First hole section; 213. Second hole section;

[0031] 3. The outer shell of a compound;

[0032] 4. Through hole;

[0033] 5. Top cover;

[0034] 6. Lower connector;

[0035] 7. Sealing components;

[0036] 8. Chuck body;

[0037] 9. Quick-connect couplings;

[0038] 100. Non-welded quick-installation sleeve cement head.

[0039] In this application, all drawings are schematic and are used only to illustrate the principles of the invention, and are not drawn to scale. Detailed Implementation

[0040] The invention will now be described with reference to the accompanying drawings.

[0041] It should be noted that the directional terms or qualifiers used in this application, such as "upper," "lower," "left," and "right," refer to the accompanying drawings. They are not used to define the absolute position of the components involved, but can vary depending on the specific circumstances.

[0042] Figure 1 The structure of the non-welded quick-connect sleeve cement head 100 according to the present invention is shown. Figure 1As shown, the non-welded quick-connect sleeve cement head 100 includes a top cover 5, a cylinder 2, a lower connector 6, a chuck body 8, and a quick-connect coupling 9 connected sequentially from left to right.

[0043] In one specific embodiment, the cylinder 2 is constructed to be generally cylindrical in shape, that is, the cylinder 2 is configured as a cylindrical tube with an inner cavity and open at both ends.

[0044] A top cover 5 is fixedly and sealed at the left end of the cylinder 2, and the top cover 5 closes the left end opening of the cylinder 2.

[0045] A lower connector 6 is fixedly and sealed at the axial right end of the cylinder 2. The lower connector 6 is axially through a cylindrical shape, and the outer diameter of the left end of the lower connector 6 is adapted to the inner diameter of the cylinder 2. That is, the left end of the lower connector 6 extends into the right end of the cylinder 2. In this embodiment, the lower connector 6 is sealed and fixed to the cylinder 2 by a toothed structure. The outer diameter of the right end of the lower connector 6 is greater than or equal to the outer diameter of the cylinder 2.

[0046] A chuck body 8 is fixedly and sealed at the right end of the lower connector 6. The chuck body 8 is axially through a cylindrical shape, and the inner diameter of the left end of the chuck body 8 matches the outer diameter of the right end of the lower connector 6. Specifically, the inner side of the left end of the chuck body 8 is provided with an internal thread, and the outer side of the right end of the lower connector 6 is provided with an external thread. The chuck body 8 and the lower connector 6 are connected by threads. The inner diameter of the right end of the chuck body 8 is greater than or equal to the inner diameter of the right end of the lower connector 6, and the inner diameter of the right end of the chuck body 8 is smaller than the outer diameter of the right end of the lower connector 6. After the chuck body 8 and the lower connector 6 are connected by threads, the lower end face of the lower connector 6 can axially abut against the chuck body.

[0047] A quick-connect coupling 9 is provided at the right end of the chuck body 8. The quick-connect coupling 9 is roughly cylindrical in shape and can be quickly fixed to the cementing casing.

[0048] A sealing component 7 is provided inside the lower connector 6. The sealing component 7 is coaxially fixed inside the lower connector 6, and the left end of the sealing component 7 abuts axially with the lower connector 6. After the cementing casing is inserted into the quick-connect coupling 9 and fixed, the left end of the cementing casing can abut axially with the sealing component 7 to form a seal.

[0049] In a preferred embodiment, the sealing assembly 7 includes a support layer and a sealing layer (not shown) coaxially connected. The axial left ends of both the support layer and the sealing layer abut axially with the lower connector 6, and the axial right ends of both the support layer and the sealing layer abut axially with the cementing casing. The support layer has a higher hardness than the sealing layer. The support layer mainly serves to bear pressure, while the sealing layer mainly serves to seal. Further, the support layer is made of metal, and the sealing layer is made of rubber. The sealing layer is fixedly connected to the support layer by vulcanization.

[0050] like Figure 2 As shown, the non-welded quick-installation sleeve cement head 100 includes a union joint 1 that penetrates the cylinder wall of the cylinder 2. The union joint 1 is provided with a sealing step 11 that can abut against the cylinder 2 and a connecting thread 12 for connecting the union shell 3. The union shell 3 and the sealing step 11 abut against the inner and outer sides of the cylinder 2, respectively.

[0051] When fixing the union connector 1 to the cylinder 2, first, the threaded end of the union connector 1 is passed through the cylinder wall of the cylinder 2 until the sealing step 11 abuts against the cylinder wall of the cylinder 2. At this point, the union connector 1 cannot move further in this direction, and the threaded end 12 and the sealing step 11 are located on opposite sides of the cylinder wall of the cylinder 2. Then, the union housing 3 is connected to the union connector 1 via the threaded end 12. The union housing 3 gradually approaches the union connector 1 during the connection process, and finally the union housing 3 abuts against the cylinder 2. At this point, the union housing 3 and the sealing step 11 abut against opposite sides of the cylinder wall of the cylinder 2, sealing and fixing the union connector 1 to the cylinder 2.

[0052] In a preferred embodiment, a set screw mounting hole (not shown) is provided on the outer wall of the union housing 3, and the central axis of the set screw mounting hole is perpendicular to the central axis of the union housing 3. After the union connector 1 and the union housing 3 are fixedly connected by a threaded connection, the set screw is then installed on the union housing 3 through the set screw mounting hole. After passing through the union housing 3, the set screw abuts against the circumferential outer wall of the union connector 1, thereby preventing relative rotation between the union housing 3 and the union connector 1, and thus preventing the seal between the union connector 1 and the cylinder 2 from failing.

[0053] In this embodiment, the end of the union housing 3 furthest from the union connector 1 is connected to a plugging tube (not shown). The union housing 3 serves two purposes: firstly, it connects the plugging tube to the union connector 1; secondly, it abuts against both sides of the cylinder wall of the cylinder body 2, along with the sealing step 11, thus sealing and fixing the union connector 1 to the cylinder body 2. The use of a non-welded, quick-installation sleeve cement head 100 significantly shortens the processing cycle compared to welded structures. This invention improves the sealing pressure resistance of the union connection sealing structure without welding, reduces the processing cycle, avoids internal weld defects caused by welding, resolves the contradiction between the lightweight, quick-installation, and safety / reliability of the cement head, and ensures the reliability and safety of the cement head in field use, providing strong technical support for drilling speed-up and efficiency improvement operations. Compared to welded structures, this invention allows for periodic disassembly, maintenance, and replacement, ensuring the reliability and safety of the cement head in field use and providing strong technical support for drilling speed-up and efficiency improvement operations.

[0054] In one specific embodiment, the cylinder 2 is provided with a union hole 21 for passing through the union connector 1, at least a portion of the union hole 21 is provided as a conical surface, and the union connector 1 is provided with a conical surface adapted to the conical surface of the union hole 21.

[0055] Specifically, such as Figure 2 and Figure 3 As shown, the union joint 1 is generally cylindrical in shape. The union joint 1 includes a first joint section 17 with gradually increasing outer diameter, a connecting thread 12, a second joint section 18, a third joint section 19, and a sealing step 11, all coaxially fixedly connected from top to bottom. A through hole 4, coinciding with the central axis of the union joint 1, is provided inside the union joint 1. The union hole 21 includes a first hole section 212 and a second hole section 213 arranged sequentially from top to bottom.

[0056] A sealing cone surface 163 is provided at the connection between the sealing step 11 and the third joint section 19. Correspondingly, a cone surface with the same inclination angle as the sealing cone surface 163 is provided at the connection between the first hole section 212 and the second hole section 213. The roughness of the sealing cone surface 163 is controlled within 1.6. Preferably, the inclination angle of the sealing cone surface 163 is in the range of 0 to 5°, where 0° refers to the angle between the sealing cone surface 163 and the central axis of the union joint 1.

[0057] After the union connector 1 is inserted into the union hole 21, the third connector section 19 is located within the first hole section 212. The two are fitted with a clearance fit with a tolerance of 0.05–0.1 mm. The sealing step 11 is located within the second hole section 213, and the upper end of the sealing step 11 abuts against the lower end of the first hole section 212, causing the union connector 1 and the sealing cone surface 163 of the union hole 21 to contact, forming a seal. The sealing step 11 and the second hole section 213 are fitted with a clearance fit with a tolerance of 0.1–0.5 mm.

[0058] In this embodiment, the union shell 3 and the sealing step 11 abut against the inner and outer sides of the cylinder 2, respectively, and the sealing cone surface 163 enables the union joint 1 to seal with the cylinder 2. Furthermore, under normal operating conditions, the inner cavity of the cylinder 2 is under high pressure, thereby generating an outward thrust on the sealing step 11, further enhancing the sealing effect of the sealing cone surface 163, achieving a sealing capacity of 50–140 MPa.

[0059] According to the present invention, an anti-rotation mechanism 13 is provided on the union connector 1, the anti-rotation mechanism 13 being configured to adapt to the union hole 21, thereby preventing the union connector from rotating relative to the union hole.

[0060] In one specific embodiment, the anti-rotation mechanism 13 includes at least one anti-rotation key 131 disposed on the outer wall of the union connector 1, and an anti-rotation groove 211 for adapting the anti-rotation key 131 is disposed on the inner wall of the union hole 21. Further, a mounting groove 132 for installing the anti-rotation key 131 is disposed on the outer wall of the union connector 1.

[0061] like Figure 3 As shown, multiple mounting grooves 132 are evenly arranged along the circumferential direction on the outer walls of the second connector section 18 and the third connector section 19. The upper half of the mounting groove 132 is located inside the second connector section 18, and the lower half of the mounting groove 132 is located inside the third connector section 19. The outer diameter of the second connector section 18 is smaller than the outer diameter of the third connector section 19, and a second chamfer 162 is provided at the connection between the second connector section 18 and the third connector section 19.

[0062] During installation, the second connector section 18 and the third connector section 19 of the union joint 1 need to pass through the union joint hole 21 of the cylinder 2 sequentially from bottom to top. The outer wall surface of the third connector section 19 and the inner wall surface of the union joint hole 21 of the cylinder 2 are both set as sealing surfaces. After installation, the third connector section 19 and the union joint hole 21 form a seal. The second connector section 18 is designed with an outer dimension smaller than the third connector section 19, and a second chamfer 162 is provided between the second connector section 18 and the third connector section 19. This reduces the machining accuracy requirements of the second connector section 18 and facilitates the insertion of the third connector section 19 into the union joint hole 21.

[0063] like Figure 2 As shown, an anti-rotation groove 211 is provided at the uppermost part of the inner wall of the first hole section 212 of the union hole 21. The number of anti-rotation grooves 211 is the same as the number of mounting grooves 132. Multiple anti-rotation grooves 211 are evenly arranged on the inner wall of the first hole section 212 along the circumferential direction.

[0064] After the union connector 1 is inserted into the union hole 21, the lower end of the mounting groove 132 is flush with the lower end of the anti-rotation groove 211, or the lower end of the mounting groove 132 is lower than the lower end of the anti-rotation groove 211. The upper end of the mounting groove 132 is higher than the upper end of the anti-rotation groove 211, that is, the upper end of the mounting groove 132 is higher than the outer wall surface of the cylinder 2, and the distance between the upper end of the mounting groove 132 and the outer wall surface of the cylinder 2 should be at least greater than the height of the anti-rotation key 131. With this setting, after the union connector 1 is inserted into the union hole 21, the anti-rotation key 131 is then placed into the mounting groove 132 from the outside of the cylinder 2, so that the anti-rotation key 131 locks the mounting groove 132 and the anti-rotation groove 211, thereby preventing the union connector 1 from rotating relative to the union hole 21, and facilitating the connection of the union outer shell 3 by means of threaded connection. After the union housing 3 is connected to the union connector 1, the lower end face of the union housing 3 contacts the outer wall surface of the cylinder 2, which can prevent the anti-rotation key 131 from disengaging from the anti-rotation groove 211.

[0065] In a preferred embodiment, a first sealing element 14 is provided between the union joint 1 and the union hole 21.

[0066] like Figure 2 and Figure 3 As shown, an annular first sealing groove 141 is provided on the outer wall of the third joint section 19, and a first sealing member 14 is disposed in the first sealing groove 141. The first sealing member 14 seals the union joint 1 with the union hole 21. Preferably, the first sealing member 14 is an O-ring.

[0067] Furthermore, the first seal 14 is located between the mounting groove 132 and the sealing step 11.

[0068] In a preferred embodiment, a second seal 15 is provided between the union connector 1 and the union housing 3.

[0069] like Figure 2 and Figure 3 As shown, the outer diameter of the connecting thread 12 is equal to the outer diameter of the second connector section 18. A second sealing groove 151 is provided between the connecting thread 12 and the second connector section 18, and a second sealing element 15 is disposed within the second sealing groove 151, which seals the union connector 1 and the union housing 3. Preferably, the second sealing element 15 is an O-ring.

[0070] Furthermore, the second seal 15 is located between the connecting thread 12 and the mounting groove 132.

[0071] The present invention adopts an O-ring seal and a sealing step 11. The O-ring seal ensures the good sealing performance of the structure, and the sealing step 11 ensures the pressure bearing performance of the structure. The thickness and strength of the sealing step 11 can be adjusted according to the pressure level used on site to meet the requirements of the site.

[0072] According to a preferred embodiment of the present invention, the end of the sealing step 11 is configured as an arc surface 10 with the same curvature as the inner wall of the cylinder 2. After the union connector 1 is inserted into the union hole 21, the arc surface 10 at the bottom of the union connector 1 coincides with the inner wall surface of the cylinder 2.

[0073] In a preferred embodiment, a first chamfer 161 is provided at the connection between the first connector segment 17 and the connecting thread 12. The first chamfer 161 facilitates the insertion of the union connector 1 into the union hole 21.

[0074] In a preferred embodiment, the connecting thread 12 is configured as a T-type thread, which has a strong bearing capacity, thereby enhancing the maximum contact force between the union shell 3 and the cylinder 2.

[0075] The installation process of the non-welded quick-connect sleeve cement head 100 is as follows.

[0076] (1) First, insert the first sealing element 14 into the first sealing groove 141 of the union joint 1. The union joint 1 from Figure 2 The opening (not shown) at the left or right end of the cylinder 2 is used to enter the cylinder 2. The first joint section 17 of the union joint 1 faces upward, and the union joint 1 is passed through the union joint hole 21 from bottom to top.

[0077] (2) After the connecting thread 12 and mounting groove 132 of the union connector 1 are exposed in the cylinder 2, the anti-rotation key 131 is placed into the mounting groove 132 from the outside of the cylinder 2. The union housing 3 is connected to the union connector 1 through the connecting thread 12. The union housing 3 gradually approaches the cylinder 2 and finally contacts the cylinder 2. Continue to rotate the union housing 3 until the sealing step 11 at the bottom of the union connector 1 enters the second hole section 213. Finally, the upper end face of the sealing step 11 abuts against the lower end face of the first hole section 212, and the lower end arc surface 10 of the sealing step 11 coincides with the inner wall surface of the cylinder 2. At this time, the union connector 1 enters the predetermined position.

[0078] (3) After the union connector 1 enters the predetermined position, unscrew the union housing 3, install the second seal 15 into the second sealing groove 151 of the union connector 1, apply lubricating oil, and finally install the union housing 3. In this embodiment, the union connector 1 is first pulled to the predetermined position by the union housing 3, and then the second seal 15 is installed. This can prevent the second seal 15 from shearing due to the difference in coaxiality between the union connector 1 and the union housing 3.

[0079] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0080] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0081] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0082] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and does not constitute any limitation on the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A non-welded, quick-mounting, spigot-and-socket type cement head, characterized in that, The system includes, from left to right, a top cover (5), a cylinder (2), a lower connector (6), a chuck body (8), and a quick-connect coupling (9). A sealing assembly (7) is provided inside the lower connector (6). The quick-connect coupling (9) is connected to the cementing casing. After the cementing casing extends into the quick-connect coupling (9), it axially abuts against the sealing assembly (7) to form a seal. It also includes a union joint (1) disposed on the wall of the cylinder (2), wherein the union joint (1) is provided with a sealing step (11) that can abut against the cylinder (2) and a connecting thread (12) for connecting the union shell (3), wherein the sealing step (11) and the union shell (3) abut against the inner and outer sides of the cylinder (2) respectively. A union hole (21) for passing through the union joint (1) is provided on the cylinder (2). An anti-rotation mechanism (13) is provided on the union joint (1). The anti-rotation mechanism (13) is configured to fit with the union hole (21) to prevent the union joint from rotating relative to the union hole. The anti-rotation mechanism (13) includes at least one anti-rotation key (131) provided on the outer wall of the union joint (1). An anti-rotation groove (211) for fitting the anti-rotation key (131) is provided on the inner wall of the union hole (21). An installation groove (132) for installing the anti-rotation key (131) is provided on the outer wall of the union joint (1).

2. The non-welded quick-mounting spigot and cement head according to claim 1, characterized in that, At least a portion of the union hole (21) is configured as a conical surface, and the union connector (1) is provided with a conical surface adapted to the conical surface of the union hole (21).

3. The non-welded quick-mounting spigot and socket cement head according to claim 1 or 2, characterized in that, A first sealing element (14) is provided between the union joint (1) and the union hole (21).

4. The non-welded quick-mounting spigot and die assembly of claim 3, wherein, The first seal (14) is located between the mounting groove (132) and the sealing step (11).

5. The non-welded quick-mounting sleeve cement head according to claim 1 or 2, characterized in that, A second seal (15) is provided between the union connector (1) and the union housing (3).

6. The non-welded quick packer head of claim 5, wherein, The second seal (15) is located between the connecting thread (12) and the mounting groove (132).

7. The non-welded quick-mounting sleeve cement head according to claim 1 or 2, characterized in that, The end of the sealing step (11) is set as an arc surface with the same curvature as the inner wall of the cylinder (2).

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