A pressure control casing head for a gas production wellhead

Abstract

The application provides a pressure control casing head for a gas production well head device, relates to the field of oil production, and comprises a casing head body, a flange plate arranged on the casing head body, a gas outlet arranged in the casing head body, a boss arranged in the casing head body, a protective plug threadedly connected to the casing head body, and a cleaning mechanism arranged in the casing head body. The cleaning mechanism comprises a sliding cavity arranged in the casing head body. The application solves the problems of complicated operation and low work efficiency of the casing head in the prior art. The automatic cleaning of the boss is realized by the cleaning mechanism, and the work efficiency is improved. The cleaning mechanism solves the problem of loosening or falling of the hanger caused by external force in the prior art. The cleaning mechanism solves the problem of the air lock phenomenon affecting the air tightness between the hanger and the casing head body in the prior art.

Description

Technical Field

[0001] This invention relates to the field of petroleum production, and more specifically, to a pressure control casing head for a gas wellhead device. Background Technology

[0002] Casing heads play a vital role in oil drilling and oil and gas production. They not only connect and suspend the casing string, but also provide sealing and pressure control functions, making them an important piece of equipment to ensure safe and efficient drilling operations.

[0003] For example, the Chinese invention patent (application number: 202310760420.9) discloses a "wellhead casing head," the description of which states that it includes a casing head body, an air cavity is formed in the upper part of the inner wall of the casing head body, an annular piston is adapted inside the air cavity, a spring is arranged inside the air cavity above the annular piston, multiple reset chambers are formed around the top port of the air cavity and all reset chambers are connected to the air cavity, multiple air outlets are evenly formed around the inner wall of the casing head body below the air cavity and all air outlets are connected to the air cavity; each reset chamber is provided with a pull cable inside, and a breathable protective plug is threaded into the top port of each reset chamber;

[0004] However, the above-mentioned wellhead casing head has some shortcomings in actual use: In the above-mentioned prior art, the air is discharged from the outlet by moving the annular piston downward, and the discharged air is used to clean the boss. However, when cleaning for the next time, it is necessary to first rotate the protective plug to disengage the protective plug from the reset chamber, and then pull the cable to drive the annular piston to reset. When the annular piston is reset, the protective plug is finally rotated and installed on the reset chamber. This is cumbersome and inefficient in actual use.

[0005] Therefore, we have made improvements to this and proposed a pressure control casing head for gas wellhead devices. Summary of the Invention

[0006] The purpose of this invention is to address the problems of cumbersome operation and low work efficiency of current sleeve head manufacturing processes.

[0007] To achieve the above-mentioned objectives, the present invention provides a pressure control casing head for gas wellhead equipment to improve the aforementioned problems.

[0008] The application is as follows:

[0009] The casing includes a casing head body, a flange disposed on the casing head body, an air outlet disposed inside the casing head body, a boss disposed inside the casing head body, a protective plug threadedly connected to the casing head body, and a cleaning mechanism disposed inside the casing head body.

[0010] The cleaning mechanism includes a sliding cavity disposed within the casing head body, a spring disposed within the sliding cavity, a jacking ring slidably disposed within the sliding cavity, an adjusting groove disposed within the casing head body, a disc slidably disposed on the adjusting groove, a rotating shaft rotatably disposed on the adjusting groove, a drive gear disposed on the rotating shaft, a drive rack disposed on the disc, and a wedge block disposed on the rotating shaft.

[0011] As a preferred technical solution of this application, the end of the disk is frustum-shaped, the two ends of the spring are respectively connected to the jacking ring and the sliding cavity, the driving gear and the driving rack are adapted to each other, and the wedge block and the jacking ring are adapted to each other.

[0012] As a preferred technical solution of this application, a torsion spring is provided on the outer side of the rotating shaft, and the two ends of the torsion spring are respectively connected to the rotating shaft and the adjusting groove, and the disc and the adjusting groove are adapted to each other.

[0013] As a preferred technical solution of this application, the sliding cavity and the protective plug are connected, and the top moving ring is provided with an L-shaped groove, which is adapted to the air outlet.

[0014] As a preferred technical solution of this application, a transmission cavity is provided inside the sleeve head body, a drive shaft is rotatably arranged inside the transmission cavity, and a roller is arranged on the drive shaft, the outer material of the roller is rubber.

[0015] As a preferred technical solution of this application, a recovery roller is provided on the drive shaft, a rope is provided on the recovery roller, the rope is slidably disposed on the sleeve head body, and the end of the rope away from the recovery roller is connected to the top moving ring.

[0016] As a preferred technical solution of this application, the roller is rotatably mounted on the drive shaft, a fixed post is provided on the roller, a pawl is rotatably mounted on the fixed post, the fixed post and the pawl are connected by a torsion spring, a ratchet is provided on the outside of the rotating shaft, and the ratchet and the pawl are mutually adapted.

[0017] As a preferred technical solution of this application, a cleaning cavity is provided in the casing body, and an elastic sheet is slidably disposed in the cleaning cavity.

[0018] As a preferred technical solution of this application, the wedge block and the elastic sheet are mutually adapted.

[0019] As a preferred technical solution of this application, the wedge block is rotatably provided with balls, which are adapted to the jacking ring and the elastic sheet respectively.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] In the scheme of this application:

[0022] 1. In order to solve the problems of cumbersome operation and low work efficiency of the existing sleeve head, this application realizes the automated cleaning of the boss by setting a cleaning mechanism, thereby improving work efficiency;

[0023] 2. By using a cleaning mechanism to compress and fix the hanger, the stability of the hanger within the casing head body is improved, solving the problem of the hanger loosening or falling off due to external force in the prior art;

[0024] 3. By setting up a cleaning mechanism, the resistance of the hanger when it moves within the inner wall of the casing head body is reduced, thus avoiding air lock and improving sealing performance. This solves the problem of air lock affecting the airtightness between the hanger and the casing head body in the prior art. Attached Figure Description

[0025] Figure 1 A schematic diagram of the structure of the pressure control casing head for the gas wellhead device provided in this application;

[0026] Figure 2 A schematic diagram of the internal two-dimensional structure of the casing head body of the pressure control casing head for the gas production wellhead device provided in this application;

[0027] Figure 3 For the pressure control casing head of the gas production wellhead device provided in this application Figure 2 Enlarged structural diagram of area A in the middle;

[0028] Figure 4 A partial cross-sectional structural diagram of the casing head body of the pressure control casing head for the gas production wellhead device provided in this application.

[0029] Figure 5 A schematic diagram of the overall structure of the wedge block for the pressure control casing head of the gas wellhead device provided in this application;

[0030] Figure 6 This is a partial cross-sectional schematic diagram of the recovery roller structure of the pressure control casing head for the gas wellhead device provided in this application.

[0031] The image shows:

[0032] 1. Sleeve head body; 101. Flange; 102. Air outlet; 103. Boss; 104. Protective plug;

[0033] 2. Cleaning mechanism; 201. Sliding cavity; 202. Spring; 203. Pushing ring; 204. Adjusting groove; 205. Disc; 206. Rotating shaft; 207. Drive gear; 208. Drive rack; 209. Wedge block; 210. Torsion spring one; 211. L-shaped groove; 212. Transmission cavity; 213. Drive shaft; 214. Roller; 215. Recycling roller; 216. Rope; 217. Fixed column; 218. Pawl; 219. Torsion spring two; 220. Ratchet; 221. Cleaning cavity; 222. Elastic sheet; 223. Ball bearing. Detailed Implementation

[0034] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0035] As described in the background section, existing sleeve head operations are cumbersome and inefficient.

[0036] To solve this technical problem, the present invention provides a pressure control casing head for a gas wellhead device, which is applied to oil production.

[0037] For details, please refer to Figures 1-6 As shown, the pressure control casing head of the gas wellhead device specifically includes: a casing head body 1, a flange 101 disposed on the casing head body 1, an air outlet 102 disposed inside the casing head body 1, a boss 103 disposed inside the casing head body 1, a protective plug 104 threadedly connected to the casing head body 1, and a cleaning mechanism 2 disposed inside the casing head body 1. In the prior art, impurities are easily left on the surface of the boss 103, and these impurities will affect the sealing performance between the boss 103 and the existing hanger. The protective plug 104 is used for air permeability.

[0038] The cleaning mechanism 2 includes a sliding cavity 201 disposed in the sleeve head body 1, a spring 202 disposed in the sliding cavity 201, a jacking ring 203 slidably disposed in the sliding cavity 201, an adjusting groove 204 disposed in the sleeve head body 1, a disc 205 slidably disposed on the adjusting groove 204, a rotating shaft 206 rotatably disposed on the adjusting groove 204, a drive gear 207 disposed on the rotating shaft 206, a drive rack 208 disposed on the disc 205, and a wedge block 209 disposed on the rotating shaft 206.

[0039] The pressure control casing head for the gas wellhead device provided by this invention addresses the problems of cumbersome operation and low work efficiency of the casing head in the prior art. This application achieves automated cleaning of the protrusion 103 through the cleaning mechanism 2, thereby improving work efficiency.

[0040] By using the cleaning mechanism 2, the hanger is squeezed and fixed, which improves the stability of the hanger in the sleeve head body 1 and solves the problem of the hanger loosening or falling off due to external force in the prior art.

[0041] By setting up the cleaning mechanism 2, the resistance of the hanger when it moves on the inner wall of the casing head body 1 is reduced, thus avoiding air lock phenomenon and improving sealing performance. This solves the problem of air lock phenomenon affecting the airtightness between the hanger and the casing head body 1 in the prior art.

[0042] To enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0043] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0044] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0045] Example 1, please refer to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a pressure-controlled casing head for a gas wellhead device has a frustum-shaped end of its disc 205. The two ends of a spring 202 are respectively connected to a jacking ring 203 and a sliding cavity 201. A drive gear 207 and a drive rack 208 are mutually adapted, and a wedge block 209 and a jacking ring 203 are mutually adapted. In use, the existing hanger is moved down along the inner wall of the casing head body 1, and the outer side of the hanger slides and presses against the disc 205, as shown... Figure 3As shown, the end of the disc 205 is frustum-shaped. The outer side of the hanger presses against the end of the disc 205, causing the disc 205 to slide along the adjustment groove 204. At the same time, the drive rack 208 on the disc 205 moves synchronously. The drive rack 208 drives the drive gear 207 to rotate. The drive gear 207 drives the rotating shaft 206 and the wedge block 209 to move synchronously. The wedge block 209 drives the top ring 203 to move upward along the sliding cavity 201. When the top ring 203 is disengaged from the limit of the wedge block 209, the elasticity of the spring 202 drives the top ring 203 to move downward along the sliding cavity 201. The top ring 203 squeezes the air on the lower side of the sliding cavity 201 out of the air outlet 102 and cleans the impurities on the surface of the boss 103 through the discharged air.

[0046] Furthermore, a torsion spring 210 is provided on the outer side of the rotating shaft 206. The two ends of the torsion spring 210 are respectively connected to the rotating shaft 206 and the adjusting groove 204. The disc 205 and the adjusting groove 204 are adapted to each other. The torsion spring 210 is used to drive the wedge block 209. When the top ring 203 slides to the bottom of the sliding cavity 201, the elasticity of the torsion spring 210 drives the rotating shaft 206, the drive gear 207, the drive rack 208 and the disc 205 to reset. Because the existing suspension blocks the disc 205, the elasticity of the torsion spring 210 drives the disc 205 to squeeze the existing suspension, thereby squeezing and fixing the suspension, improving the stability of the suspension in the sleeve head body 1, and preventing displacement or detachment due to external force during operation.

[0047] Furthermore, the sliding cavity 201 and the protective plug 104 are connected. The jacking ring 203 is provided with an L-shaped groove 211, which is adapted to the air outlet 102. When the jacking ring 203 slides to the bottom of the sliding cavity 201, the L-shaped groove 211 on the jacking ring 203 and the air outlet 102 are connected. Thus, the L-shaped groove 211, the air outlet 102, the protective plug 104 and the sliding cavity 201 are all connected to the outside. At this time, when the hanger moves on the inner wall of the sleeve head body 1, the resistance is reduced, so that the hanger can smoothly reach the predetermined position on the inner wall of the sleeve head body 1, avoiding the air lock phenomenon, thereby improving the sealing performance.

[0048] The cleaning mechanism 2 drives the top ring 203 to slide down, and the top ring 203 compresses the air, so that the compressed air is discharged from the air outlet 102 and cleans the boss 103. The elasticity of the torsion spring 210 drives the disc 205 to compress and fix the hanger, thereby improving the stability of the hanger in the sleeve head body 1. By driving the top ring 203 to slide to the bottom of the sliding cavity 201, the resistance of the hanger when it moves on the inner wall of the sleeve head body 1 is reduced, and the air lock phenomenon is avoided, thereby improving the sealing performance.

[0049] Example 2 further optimizes the pressure control casing head for the gas wellhead device provided in Example 1. Specifically, as follows: Figure 2 , Figure 3 , Figure 4 , Figure 5 and Figure 6 As shown, a transmission cavity 212 is provided inside the sleeve head body 1. A drive shaft 213 is rotatably arranged inside the transmission cavity 212. A roller 214 is arranged on the drive shaft 213. The outer material of the roller 214 is rubber. When the hanger moves down along the inner wall of the sleeve head body 1, the outer side of the hanger will squeeze the roller 214. Because the outer material of the roller 214 is rubber, the hanger drives the outer side of the roller 214 to deform and rotate. The stability of the hanger is improved by the squeezing of the hanger by the roller 214.

[0050] Furthermore, a recovery roller 215 is provided on the drive shaft 213, and a rope 216 is provided on the recovery roller 215. The rope 216 is slidably disposed on the sleeve head body 1. The end of the rope 216 away from the recovery roller 215 is connected to the top moving ring 203. When the hanger disengages from the sleeve head body 1, the hanger moves upward to disengage. The hanger drives the roller 214 to rotate, and the roller 214 drives the recovery roller 215 to rotate synchronously. The recovery roller 215 pulls the rope 216, and the rope 216 resets the top moving ring 203. At this time, the top moving ring 203 automatically resets.

[0051] Furthermore, the roller 214 is rotatably mounted on the drive shaft 213, and a fixed post 217 is provided on the roller 214. A pawl 218 is rotatably mounted on the fixed post 217. The fixed post 217 and the pawl 218 are connected by a torsion spring 219. A ratchet 220 is provided on the outside of the rotating shaft 206. The ratchet 220 and the pawl 218 are mutually adapted, such as... Figure 2 and Figure 6 As shown, when the top moving ring 203 moves downward, it pulls the rope 216, which drives the recovery roller 215 and the ratchet 220 to rotate synchronously. The ratchet 220 idles, and the rope 216 is continuously released as the top moving ring 203 slides. When the hanger moves upward and disengages from the sleeve head body 1, the hanger drives the roller 214 to rotate. The pawl 218 on the roller 214 drives the ratchet 220 to rotate synchronously, and the ratchet 220 drives the recovery roller 215 to rotate synchronously. The rope 216 on the recovery roller 215 drives the top moving ring 203 to reset. The rope 216 is wound around the outside of the recovery roller 215, thereby realizing automated cleaning and improving work efficiency.

[0052] Furthermore, a cleaning chamber 221 is provided inside the sleeve head body 1, and an elastic sheet 222 is slidably disposed inside the cleaning chamber 221. The elastic sheet 222 is slidably disposed inside the cleaning chamber 221 and is used to scrape off impurities on the outside of the roller 214 to prevent slippage when the hanger drives the roller 214 to rotate.

[0053] Furthermore, the wedge block 209 and the elastic sheet 222 are adapted to each other. When the wedge block 209 rotates and squeezes the elastic sheet 222, the degree to which the elastic sheet 222 squeezes the roller 214 will be increased, thereby improving the cleaning efficiency of the elastic sheet 222 on the roller 214.

[0054] Furthermore, a ball bearing 223 is rotatably mounted on the wedge block 209. The ball bearing 223 is adapted to the top moving ring 203 and the elastic plate 222 respectively. Through the contact between the ball bearing 223 and the top moving ring 203 and the elastic plate 222, the friction between them is reduced, preventing the equipment from getting stuck during use.

[0055] The cleaning mechanism 2 enables automated cleaning of the boss 103, improving work efficiency.

[0056] The usage process of the pressure control casing head for the gas wellhead device provided by this invention is as follows:

[0057] In use, the existing hanger is moved down along the inner wall of the sleeve head body 1 and installed. The outer side of the hanger slides and presses against the disc 205, causing the disc 205 to slide along the adjusting groove 204. At the same time, the drive rack 208 on the disc 205 moves synchronously, driving the drive gear 207 to rotate. The drive gear 207 drives the rotating shaft 206 and the wedge block 209 to move synchronously. The wedge block 209 drives the jacking ring 203 to move along the sliding cavity 201. As the moving ring 203 disengages from the wedge block 209, it is driven downward along the sliding cavity 201 by the elasticity of the spring 202. The moving ring 203 forces the air at the lower side of the sliding cavity 201 out through the air outlet 102, cleaning the impurities on the surface of the boss 103 with the discharged air. When the moving ring 203 slides downward, the elasticity of the torsion spring 210 drives the rotating shaft 206, the drive gear 207, and the drive rack 208. 08 and disc 205 are reset. The elasticity of torsion spring 210 drives disc 205 to press the existing suspension, thus fixing the suspension. At the same time, the jacking ring 203 pulls rope 216, which drives the recovery roller 215 and ratchet 220 to rotate synchronously. The ratchet 220 idles, and rope 216 is continuously released as the jacking ring 203 slides. At this time, the suspension drives roller 214 to rotate, and at the same time, wedge block 209 and ball bearing 223 rotate. The elastic sheet 222 is squeezed to clean the roller 214. When the hanger moves upward and disengages from the sleeve head body 1, the hanger drives the roller 214 to rotate. The pawl 218 on the roller 214 drives the ratchet 220 to rotate synchronously. The ratchet 220 drives the recovery roller 215 to rotate synchronously. The rope 216 on the recovery roller 215 drives the top ring 203 to reset. The rope 216 is wound around the outside of the recovery roller 215, thus realizing automated cleaning.

[0058] 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 part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0059] Obviously, the embodiments described above are merely some embodiments of the present invention, not all embodiments. The accompanying drawings show preferred embodiments of the present invention, but do not limit the patent scope of the present invention. The present invention can be implemented in many different forms; rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of 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 specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the patent protection scope of this invention.

Claims

1. A pressure control casing head for a gas wellhead device, comprising a casing head body (1), a flange (101) disposed on the casing head body (1), a gas outlet (102) disposed within the casing head body (1), a boss (103) disposed within the casing head body (1), and a protective plug (104) threadedly connected to the casing head body (1), characterized in that, It also includes a cleaning mechanism (2) disposed within the sleeve head body (1); The cleaning mechanism (2) includes a sliding cavity (201) disposed in the sleeve head body (1), a spring (202) disposed in the sliding cavity (201), a jacking ring (203) slidably disposed in the sliding cavity (201), an adjusting groove (204) disposed in the sleeve head body (1), a disc (205) slidably disposed on the adjusting groove (204), a rotating shaft (206) rotatably disposed on the adjusting groove (204), a drive gear (207) disposed on the rotating shaft (206), a drive rack (208) disposed on the disc (205), and a wedge block (209) disposed on the rotating shaft (206). The end of the disk (205) is frustum-shaped, the two ends of the spring (202) are respectively connected to the top moving ring (203) and the sliding cavity (201), the drive gear (207) and the drive rack (208) are adapted to each other, and the wedge block (209) and the top moving ring (203) are adapted to each other; A torsion spring (210) is provided on the outside of the rotating shaft (206). The two ends of the torsion spring (210) are respectively connected to the rotating shaft (206) and the adjusting groove (204). The disc (205) and the adjusting groove (204) are adapted to each other. The sliding cavity (201) and the protective plug (104) are connected. The top moving ring (203) is provided with an L-shaped groove (211), and the L-shaped groove (211) and the air outlet (102) are adapted to each other. The sleeve head body (1) is provided with a transmission cavity (212), and a drive shaft (213) is rotatably arranged in the transmission cavity (212). A roller (214) is arranged on the drive shaft (213), and the outer side of the roller (214) is made of rubber. A recovery roller (215) is provided on the drive shaft (213), and a rope (216) is provided on the recovery roller (215). The rope (216) is slidably disposed on the sleeve head body (1), and one end of the rope (216) away from the recovery roller (215) is connected to the top moving ring (203).

2. The pressure control casing head for a gas wellhead device according to claim 1, characterized in that, The roller (214) is rotatably mounted on the drive shaft (213). A fixed post (217) is provided on the roller (214). A pawl (218) is rotatably mounted on the fixed post (217). The fixed post (217) and the pawl (218) are connected by a torsion spring (219). A ratchet (220) is provided on the outside of the rotating shaft (206). The ratchet (220) and the pawl (218) are mutually compatible.

3. The pressure control casing head for a gas wellhead device according to claim 2, characterized in that, The sleeve head body (1) is provided with a cleaning cavity (221), and an elastic sheet (222) is slidably disposed in the cleaning cavity (221).

4. The pressure control casing head for a gas wellhead device according to claim 3, characterized in that, The wedge block (209) and the elastic sheet (222) are adapted to each other.

5. A pressure control casing head for a gas wellhead device according to claim 4, characterized in that, The wedge block (209) is rotatably provided with ball bearings (223), which are adapted to the top moving ring (203) and the elastic sheet (222) respectively.

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