A rotary head structure for quick connection of oil and liquid

Abstract

This invention discloses a rotary head structure for quick oil and liquid connection, comprising a housing and a rotary assembly installed inside the housing. The rotary assembly includes an upper outer shell and a lower outer shell with the same inner diameter but different outer diameters. An annular cavity is formed between the upper and lower outer shells and the housing. Both the upper and lower outer shells have annular flow grooves on their outer walls. An upper cover is provided above the upper outer shell. A first coolant flow channel and a second coolant flow channel, communicating with a cooling chamber, are formed within the upper cover and the upper outer shell. The cooling chamber is located within the upper cover. The first coolant flow channel communicates with a coolant pipe located inside the housing through the annular cavity. The second coolant flow channel communicates with a coolant pipe located on the other side of the housing through a flow groove on the upper outer shell. A balance oil pipe is also formed inside the housing, communicating with a balance oil flow channel penetrating the rotary assembly through a flow groove on the lower outer shell. This invention reduces operator workload, improves overall equipment safety, and is highly practical.

Description

Technical Field

[0001] This invention relates to the field of auxiliary oil supply and circulating cooling technology for rotary heads in oil and gas drilling, and particularly to a rotary head structure for rapid oil and fluid connection. Background Technology

[0002] Blowout preventers (BOPs) are used to close the wellhead during oil testing, well workover, well completion, and other special operations to prevent blowout accidents. They are characterized by simple structure, easy operation, and high pressure resistance, and are commonly used safety sealing devices for preventing blowouts in oilfields. They are classified into ordinary BOPs, universal BOPs, and rotary heads. Rotary heads can achieve simultaneous drilling and blowout operations.

[0003] The rotary head assembly typically requires a continuous supply of pressurized unidirectional hydraulic oil to balance well pressure and achieve controlled-pressure drilling. This pressurized oil also dissipates heat from the internal bearings and prevents drilling fluid from entering the rotary assembly. Furthermore, due to high-speed rotation, the dynamic sealing components inside the rotary assembly (especially the upper part) generate very high temperatures due to frictional heat. A circulating coolant system is usually required to continuously cool them and ensure the normal service life of the dynamic seals. Currently, the balancing pressure oil and circulating coolant for rotary assemblies are typically supplied via a dedicated hydraulic control system connected and supplied through high-pressure hoses and quick-connect couplings. The pipeline terminals are usually located on the upper part of the rotary assembly housing. Each time the rotary assembly is installed or replaced, operators must manually disassemble or install the pipelines at the wellhead, which is time-consuming, labor-intensive, and increases the risk of leakage from the quick-connect couplings. In particular, when the rotating head clamp is abnormally locked, the rotating assembly may rotate with the drill bit. At this time, the pressure line fixed to it will also rotate and become entangled on the drill bit and assembly. This situation is very dangerous. Once the line is broken or jammed, the drill bit may cause injury to surrounding equipment and personnel. Summary of the Invention

[0004] In order to solve the above-mentioned technical problems, the present invention provides a rotary head structure for quick connection of oil and liquid.

[0005] The present invention is achieved by the following technical solution.

[0006] A rotary head structure for quick oil / liquid connection includes a housing and a rotary assembly installed inside the housing. The rotary assembly includes an upper outer shell and a lower outer shell with the same inner diameter but different outer diameters. An annular cavity is formed between the upper outer shell and the lower outer shell and the housing. An annular flow groove is provided on the outer wall of both the upper outer shell and the lower outer shell.

[0007] An upper cover is provided above the upper outer shell. A first coolant flow channel and a second coolant flow channel are formed in the upper cover and the upper outer shell, which are connected to the cooling chamber. The cooling chamber is placed in the upper cover. The first coolant flow channel is connected to the coolant pipe located in the shell through an annular cavity. The second coolant flow channel is connected to the coolant pipe located on the other side of the shell through a flow groove on the upper outer shell.

[0008] The housing also forms a balance oil pipe, which is connected to the balance oil flow channel through the rotating assembly via a flow groove on the lower outer shell.

[0009] Furthermore, a first coolant seal and a second coolant seal are installed on the outer wall of the upper housing, and a flow groove disposed on the upper housing is located between the first coolant seal and the second coolant seal.

[0010] Furthermore, a first oil seal and a second oil seal are installed on the outer wall of the lower housing, and a flow groove provided on the lower housing is located between the first oil seal and the second oil seal.

[0011] Furthermore, a lower cover is provided below the lower outer shell.

[0012] Furthermore, sealing mechanisms are installed on the connection surfaces between the upper cover and the upper outer shell, as well as between the lower cover and the lower outer shell.

[0013] Furthermore, the outer end face of the upper cover is provided with an exhaust hole that extends into the inner cavity of the rotating assembly and has sealing threads.

[0014] Furthermore, the outer surface of the upper housing is provided with a beveled end face, and a locking mechanism matching the beveled end face is installed on the housing.

[0015] The present invention achieves the following beneficial effects.

[0016] When the rotating assembly is installed into the housing and locked in place, the balance pressure oil and circulating coolant circuit interfaces on the housing are automatically and quickly connected and sealed to the rotating assembly shell. This transfers the pipeline interfaces originally located on the rotating assembly to the housing body. The pipelines only need to be connected once when installing the housing. No further operation on the pipelines is required when installing or disassembling the assembly. This greatly reduces the workload of operators and improves the overall safety of the equipment. The invention is simple in design, convenient, reliable, and suitable for widespread application. Attached Figure Description

[0017] Figure 1 This is a cross-sectional structural diagram intended to illustrate the balanced oil flow channel direction of the present invention;

[0018] Figure 2 This is a cross-sectional structural diagram intended to illustrate the direction of the coolant pipeline in this invention;

[0019] Figure 3 yes Figure 1 Enlarged view of section A.

[0020] Among them, 1. housing; 2. rotating assembly; 21. upper outer shell; 22. lower outer shell; 23. upper cover; 231. sealing mechanism; 232. vent; 24. lower cover; 25. beveled end face; 3. locking mechanism; 4. first coolant seal; 5. second coolant seal; 6. first oil seal; 7. second oil seal; 8. annular cavity; 9. cooling chamber; 10. first coolant flow channel; 11. second coolant flow channel; 12. coolant pipe; 13. flow groove; 14. balance oil pipe; 15. balance oil flow channel. Detailed Implementation

[0021] The technical solution of the present invention will be clearly and completely described below through specific embodiments.

[0022] like Figure 1-3 As shown, a rotary head structure for quick oil / liquid connection includes a cylindrical housing 1 with an inner cavity and a rotary assembly 2 installed inside the housing 1.

[0023] The rotating assembly 2 includes an upper outer shell 21, a lower outer shell 22, an upper cover 23, and a lower cover 24. The upper outer shell 21 has an inclined end face 25 on its exterior, and the housing 1 is equipped with a locking mechanism 3 that matches the inclined end face 25. The upper outer shell 21 and the lower outer shell 22 have the same inner diameter but different outer diameters. A first coolant seal 4 and a second coolant seal 5 are installed on the outer wall of the upper outer shell 21, and a first oil seal 6 and a second oil seal 7 are installed on the outer wall of the lower outer shell 22.

[0024] After the rotating assembly 2 is installed on the housing 1, since the inner diameter of the upper outer shell 21 and the lower outer shell 22 is the same but the outer diameter is different, an annular cavity 8 is formed between the upper outer shell 21 and the lower outer shell 22 and the housing 1.

[0025] The upper cover 23 is provided with a cooling chamber 9, which is connected to a first coolant channel 10 and a second coolant channel 11. The first coolant channel 10 and the second coolant channel 11 are both located inside the upper cover 23 and the upper outer shell 21. The first coolant channel 10 is connected to an annular cavity 8, and the annular cavity 8 is connected to a coolant pipe 12 located on the shell 1.

[0026] Both the upper outer casing 21 and the lower outer casing 22 have annular flow grooves 13 on their outer walls. The two flow grooves 13 are located between the first coolant seal 4 and the second coolant seal 5, and between the first oil seal 6 and the second oil seal 7, respectively. The flow groove 13 between the first coolant seal 4 and the second coolant seal 5 communicates with the second coolant flow channel 11, and also communicates with the coolant pipe 12 located on the other side of the casing 1. The flow groove 13 between the first oil seal 6 and the second oil seal 7 communicates with the balance oil pipe 14 located on the casing 1, and also communicates with the balance oil flow channel 15 that penetrates the rotating assembly 2, located inside the lower outer casing 22.

[0027] In this embodiment, when using the present invention, the rotating assembly 2 is directly installed in the housing 1, and the rotating assembly 2 is fixed by the locking mechanism 3 installed on the housing 1. The method of fixing the rotating assembly 2 is already mature in the prior art. The present invention only provides a preferred structure of the locking mechanism 3: a locking outer shell is connected to the upper outer wall of the housing 1, and the upper end of the housing 1 and the upper end of the locking outer shell are connected by a locking cover; a cavity is formed between the housing 1 and the locking outer shell, and a locking piston is slidably arranged in the cavity; a synchronous hydraulic cylinder is provided on the locking cover, and the output end of the synchronous hydraulic cylinder is connected to the upper end of the locking piston; a plurality of through displacement grooves are formed on the upper side wall of the housing 1, and the displacement grooves communicate with the cavity, and a locking ball is slidably arranged in the displacement grooves. When the locking piston moves downward, it contacts the locking ball and presses the locking ball against the displacement groove. When the locking ball is in the pressed state, a part of the locking ball protrudes into the inside of the housing 1 and cooperates with the inclined end face 25 on the outside of the upper housing 21 to fix the rotating assembly 2.

[0028] After the rotating assembly 2 is fixed, the coolant pipe 12 is connected to the annular cavity 8, and then connected to the cooling chamber 9 through the first coolant flow channel 10. Additionally, the cooling chamber 9 is also connected to one of the flow channel grooves 13 through the second coolant flow channel 11, and this flow channel groove 13 is connected to the coolant pipe 12 on the other side. The balance oil pipe 14 and the coolant pipe 12 do not interfere with each other, and the corresponding flow groove 13 also does not interfere with each other.

[0029] The liquid flow method using the annular cavity 8 and flow channel 13 of this invention allows the rotating assembly 2 to be installed in the housing 1 at any angle, thus facilitating installation and disassembly. Furthermore, the flow method using the annular cavity 8 is suitable for rotating assemblies 2 with multiple different outer diameters, requiring only the provision of a corresponding number of first coolant channels 10 and second coolant channels 11. The arrangement of multiple annular cavities 8, first coolant channels 10, and second coolant channels 11 significantly enhances the cooling effect.

[0030] like Figure 2As shown, coolant is injected into the coolant pipe 12 on one side, enters the annular cavity 8, and then flows through the first coolant channel 10 into the cooling chamber 9 to cool the rotating assembly 2. The coolant then flows out through the second coolant channel 11 into the flow groove 13. The flow groove 13 and the annular cavity 8 are not incompatible, so they do not affect each other. Finally, the coolant flows out from the coolant pipe 12 on the other side, thus achieving coolant circulation. In this application, the first coolant channel 10 and the second coolant channel 11 are either output or input ends to each other. This design provides better installation adaptability. In practice, the positional relationship between the first coolant channel 10 and the second coolant channel 11 can also be considered according to specific circumstances.

[0031] like Figure 1 As shown, balance oil is injected into the flow channel 13, which is not used for coolant circulation, through the balance oil pipe 14, and then flows into the interior of the rotating assembly 2 through the balance oil flow channel 15 to assist the operation of the rotating assembly 2.

[0032] This application features sealing mechanisms 231 installed at the connection surfaces between the upper cover 23 and the upper outer shell 21, and between the lower cover 24 and the lower outer shell 22. This design ensures a tight seal. In practice, sealing measures can also be considered depending on the specific circumstances.

[0033] The outer end face of the upper cover 23 may also be provided with an exhaust hole 232 that extends into the inner cavity of the rotating assembly 2 and has sealing threads. This design allows for venting when needed and sealing when not needed. In practice, the number and location of the exhaust holes can also be considered according to specific circumstances.

[0034] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the concept and scope of the present invention. Without departing from the design concept of the present invention, all modifications and improvements made by those skilled in the art to the technical solutions of the present invention should fall within the protection scope of the present invention. The technical content for which protection is sought in the present invention has been fully described in the technical requirements.

Claims

1. A rotary head structure for quick oil / liquid connection, comprising a housing (1) and a rotary assembly (2) installed inside the housing (1), characterized in that: The rotating assembly (2) includes an upper outer shell (21) and a lower outer shell (22) with the same inner diameter but different outer diameters. An annular cavity (8) is formed between the upper outer shell (21) and the lower outer shell (22) and the housing (1). An annular flow groove (13) is provided on the outer wall of both the upper outer shell (21) and the lower outer shell (22). An upper cover (23) is provided above the upper outer shell (21). A first coolant flow channel (10) and a second coolant flow channel (11) communicating with the cooling chamber (9) are formed in the upper cover (23) and the upper outer shell (21). The cooling chamber (9) is placed in the upper cover (23). The first coolant flow channel (10) is connected to the coolant pipe (12) located in the shell (1) through the annular cavity (8). The second coolant flow channel (11) is connected to the coolant pipe (12) located on the other side of the shell (1) through the flow groove (13) on the upper outer shell (21). The housing (1) also forms a balance oil pipe (14), which is connected to the balance oil flow channel (15) of the rotating assembly (2) through the flow groove (13) on the lower housing (22).

2. The rotary head structure for quick oil / liquid connection according to claim 1, characterized in that: The outer wall of the upper housing (21) is equipped with a first coolant seal (4) and a second coolant seal (5), and the flow groove (13) provided on the upper housing (21) is located between the first coolant seal (4) and the second coolant seal (5).

3. The rotary head structure for quick oil / liquid connection according to claim 1, characterized in that: The outer wall of the lower housing (22) is equipped with a first oil seal (6) and a second oil seal (7), and the flow groove (13) provided on the lower housing (22) is located between the first oil seal (6) and the second oil seal (7).

4. The rotary head structure for quick oil / liquid connection according to claim 1, characterized in that: A lower cover (24) is provided below the lower outer shell (22).

5. The rotary head structure for quick oil / liquid connection according to claim 1, characterized in that: Sealing mechanisms (231) are installed on the connecting surfaces between the upper cover (23) and the upper outer shell (21) and between the lower cover (24) and the lower outer shell (22).

6. The rotary head structure for quick oil / liquid connection according to claim 1, characterized in that: The outer end face of the upper cover (23) is provided with an exhaust hole (232) that extends into the inner cavity of the rotating assembly (2) and has a sealing thread.

7. The rotary head structure for quick oil / liquid connection according to claim 1, characterized in that: The upper outer shell (21) is provided with a beveled end face (25), and a locking mechanism (3) matching the beveled end face (25) is installed on the shell (1).

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