Environment-friendly oil production wellhead device

Abstract

The utility model relates to the technical field of oil extraction well head devices, in particular to an environment-friendly oil extraction well head device which comprises a casing head, an oil pipe head and a connecting disc fixed on the lower surface of the oil pipe head, a connecting groove is formed in the upper end of the casing head, and a connecting ring is in threaded connection with an inner ring of the connecting groove and fixed on the lower surface of the connecting disc. An adjusting ring is fixed to the lower surface of the connecting ring and pushes a top plate to vertically move through an adjusting structure, and a sealing ring is arranged on the top plate and extruded by a pressing ring. The device has the beneficial effects that the connecting ring and the connecting groove at the bottom end of the tubing head are directly screwed together, the connecting time of a bolt is saved, during continuous screwing, the adjusting ring on the lower surface of the connecting ring can descend and gradually make contact with the ball, so that the ball rotates in the pushing frame, and when the adjusting ring gradually descends, the ball can be pushed to drive the pushing frame to move; and the top plate is pushed to ascend, so that the sealing ring is tightly attached to the pressing ring, and the sealing effect is achieved.

Description

Technical Field

[0001] This utility model relates to the field of oil wellhead devices, specifically an environmentally friendly oil wellhead device. Background Technology

[0002] Environmentally friendly oil wellhead equipment is a key piece of equipment used in oil extraction to reduce environmental pollution, improve safety, and increase resource utilization efficiency. The wellhead equipment mainly consists of casing head, tubing head, and Christmas tree, and its main purpose is to improve sealing and prevent leakage, thereby achieving environmental protection. However, in existing technologies, the casing head and tubing head are connected by flanges and sealed with sealing rings.

[0003] In existing technologies, such as environmentally friendly oil wellhead devices (application number CN201810050501.9), the use of such devices can prevent the spillage of dirt and crude oil from cleaning tubing and sucker rods during oil well maintenance and deep well pump inspections, thus eliminating environmental pollution. Furthermore, the use of environmentally friendly oil wellhead devices can shorten construction time, save construction costs, and reduce labor intensity.

[0004] However, in actual use, cleaning the oil pipes with a deep well pump requires frequent disassembly of the flange structure to achieve cleaning, and the disassembly of the flange connection is quite cumbersome. Utility Model Content

[0005] The purpose of this invention is to provide an environmentally friendly oil wellhead device to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution: including a casing head and an oil pipe head, a connecting plate fixed on the lower surface of the oil pipe head, a connecting groove is provided at the upper end of the casing head, a connecting ring is screwed into the inner ring of the connecting groove, the connecting ring is fixed on the lower surface of the connecting plate, an adjusting ring is fixed on the lower surface of the connecting ring, the adjusting ring pushes the top plate to move vertically through the adjusting structure, a sealing ring is provided on the top plate, and the sealing ring is squeezed by the pressure ring.

[0007] Preferably, the tubing head and the connecting disc are integrally formed, the connecting ring and the connecting disc are integrally formed, and the inner ring of the connecting ring is screwed to the connecting groove.

[0008] Preferably, the bottom end of the connecting groove is provided with a push groove, the top surface of the push groove is provided with a top groove, and the top surface of the top groove is provided with a sealing groove. The push groove provides a path for the adjustment structure, and the top groove provides a path for the movement of the top plate.

[0009] Preferably, the inner ring at the bottom of the adjusting ring has a chamfer. The adjusting structure includes a push frame, a ball, a ramp, and a spring. The ball is movably connected inside the push frame. The opening diameter of the push frame is smaller than the diameter of the ball. One end of the ball is located outside the push frame, and one end of the ball is in contact with the inner ring of the adjusting ring. The ball is tangent to the inner wall of the push frame. The ramp has a chamfered structure and is located at the upper right corner of the push frame. One end of the spring is fixed to the surface of the push frame, and the other end of the spring is fixed to the inner wall of the push groove.

[0010] Preferably, the top plate slides within the sealing groove, the bottom end of the top plate has a chamfered structure, the inclined side of the top plate is parallel to the inclined side of the slope, the two-dimensional end face of the top plate has a "T" shaped structure, and the horizontal plate of the top plate has a "ring" shaped structure.

[0011] Preferably, the horizontal plate of the top plate is located in the sealing groove, and a retaining ring is fixed at the upper end of the sleeve head. The retaining ring fits into the sealing groove, and the end face size of the sealing groove is equal to that of the pressure ring. The pressure ring is fixed on the lower surface of the connecting plate, and the connecting plate and the pressure ring are integrally formed.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] The environmentally friendly oil wellhead device proposed in this utility model connects the casing head and the tubing head together. Traditionally, this requires a flange connection, but flange connections require multiple bolts for installation, which is extremely inconvenient. The connecting ring and connecting groove at the bottom of the tubing head are directly screwed together, saving the bolt connection time. As the screwing continues, the adjusting ring on the lower surface of the connecting ring will descend and gradually contact the ball, causing the ball to rotate inside the push frame. As the adjusting ring gradually descends, it will push the ball and drive the push frame to move until the slope hits the chamfer at the bottom of the top plate and pushes the top plate up, so that the sealing ring tightly fits the pressure ring, achieving a sealing effect. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0015] Figure 2 This is a partial structural diagram of the casing head and tubing head of this utility model;

[0016] Figure 3 This utility model Figure 2 A top-view structural diagram;

[0017] Figure 4 This utility model Figure 3 Schematic diagram of the cross-sectional structure along the middle AA direction;

[0018] Figure 5 This utility model Figure 4 Enlarged structural diagram at point A in the middle;

[0019] Figure 6This is a partial structural diagram of the connection between the casing head and the tubing head of this utility model;

[0020] Figure 7 This utility model Figure 6 A top-view structural diagram;

[0021] Figure 8 This utility model Figure 7 Schematic diagram of the cross-sectional structure in the middle BB direction;

[0022] Figure 9 This utility model Figure 8 Enlarged structural diagram at point B;

[0023] Figure 10 This is a partial structural diagram of the connection port of the sleeve head of this utility model;

[0024] Figure 11 This utility model Figure 10 Mid-top view of the structure;

[0025] Figure 12 This utility model Figure 11 Schematic diagram of the cross-sectional structure along the CC direction;

[0026] Figure 13 This utility model Figure 12 Enlarged structural diagram at point C;

[0027] Figure 14 This is a schematic diagram of the adjustment structure of this utility model.

[0028] In the diagram: 1. Casing head; 2. Tubing head; 3. Christmas tree; 4. Connecting ring; 5. Adjusting ring; 6. Push frame; 7. Slope; 8. Sphere; 9. Spring; 10. Top plate; 11. Sealing ring; 12. Pressure ring; 13. Connecting disc; 14. Connecting groove; 15. Push groove; 16. Top groove; 17. Sealing groove; 18. Retaining ring. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this utility model clear and complete, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of this utility model, and are merely used to explain the embodiments of this utility model. They are not intended to limit the embodiments of this utility model. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0030] Example 1

[0031] Please see Figures 1-14This utility model provides a technical solution: an environmentally friendly oil wellhead device, which includes a wellhead device mainly composed of a casing head 1, an oil tubing head 2 and an oil well tree 3, a connecting plate 13 fixed on the lower surface of the oil tubing head 2, a connecting groove 14 opened at the upper end of the casing head 1, a connecting ring 4 screwed into the inner circle of the connecting groove 14, the oil tubing head 2 and the connecting plate 13 are integrally formed, and the connecting ring 4 and the connecting plate 13 are integrally formed.

[0032] Specifically, the wellhead assembly consists of casing head 1, tubing head 2, and Christmas tree 3 as the main components, supplemented by a hydraulic six-way integrated valve body, a multi-stage sealing structure and anti-wear design, a casing gas recovery device, and monitoring and interface devices. Casing head 1 sits on the wellhead, with the casing fitted inside. Casing head 1 bears pressure from tubing head 2 and Christmas tree 3, serving as a pressure-bearing support component. It connects the casing string to tubing head 2, forming an annular seal base. Generally, API standard C-22 or C-29 type casing head 1 is used. Tubing head 2 suspends the tubing, commonly using API standard T-21 or T-22 type tubing head 2. The main valve, safety valve, wing valve, and top valve on Christmas tree 3 are used for flow control, blowout prevention protection, and production monitoring. Depending on the working pressure, API 6A standard valves ranging from 2,000 psi to 10,000 psi can be selected. The psi series; the six-way integrated hydraulic cylinder body consists of a six-way hydraulic cylinder body with multiple interfaces such as upper, lower, and side ports, integrating sampling, chemical dosing, purging, ball dropping, and pressure relief operations to achieve multi-functional wellhead sealing operations. The six-way integrated hydraulic cylinder body is mostly based on API head connection and self-control valve interface; the multi-stage sealing structure and anti-wear design adopts upper and lower bases and conical packing sleeves, spiral gaskets, air-filled coils, etc., in conjunction with slide rods to form an elastic sealing cavity and lubricating oil cavity, effectively extending the sealing life and preventing seal failure due to wear; the casing gas recovery device adopts a combination of constant pressure venting valve and negative pressure anti-backflow structure, controlling the recovery of casing annular gas according to the change of pumping unit stroke, and preventing freezing blockage through heat exchange. The casing gas recovery device commonly uses the oilfield standard Q / SHCG series gas-liquid separator + pressure stabilizing tank combination; the monitoring and interface device is equipped with pressure gauges, transmitters, flow meters, various valve interfaces, and top... The valve is used for monitoring oil production parameters, safety protection, and equipment access. The monitoring and interface device is connected to the RTU remote terminal unit and SCADA system interface. During oil well production, oil and gas rise through the tubing inside the casing head 1 and tubing head 2. The Christmas tree 3 regulates the oil and gas flow and provides production control through the valve. The six-way structure of the hydraulic cylinder has a plunger with multiple ports to realize functions such as on-site sampling, quantitative chemical dosing, wellhead purging, backflow prevention, pressure testing, and emergency pressure relief, improving operational safety and automation. Dynamic casing gas recovery utilizes the principle of wellhead pressure reduction during the downstroke of the pumping unit to allow casing gas to enter the tubing for gathering and transportation through the pressure regulating valve. The upstroke valve body closes or switches to prevent gas backflow and maintain recovery efficiency, especially in winter to prevent the valve body from freezing through heat exchange. When installing the casing head 1 and tubing head 2, align the connecting ring 4 at the bottom of the tubing head 2 with the connecting groove 14 and screw it on.

[0033] Example 2

[0034] Based on Embodiment 1, in order to achieve quick installation of the casing head and the tubing head together and improve the sealing effect during installation, a method is proposed whereby the inner ring of the connecting ring 4 is screwed to the connecting groove 14, the connecting ring 4 is fixed to the lower surface of the connecting plate 13, and an adjusting ring 5 is fixed to the lower surface of the connecting ring 4. The adjusting ring 5 pushes the top plate 10 to move vertically through the adjusting structure. The inner ring at the bottom end of the adjusting ring 5 has a chamfer. The adjusting structure includes a push frame 6, a ball 8, a ramp 7, and a spring 9. The ball 8 is movably connected inside the push frame 6. The opening diameter of the push frame 6 is smaller than the diameter of the ball 8. One end of the ball 8 is located outside the push frame 6, and one end of the ball 8 is in contact with the inner ring of the adjusting ring 5. The ball 8 is tangent to the inner wall of the push frame 6. The ramp 7 has a chamfered structure and is located at the upper right corner of the push frame 6. One end of the spring 9 is fixed to the surface of the push frame 6, and the other end of the spring 9 is fixed to the inner ring of the adjusting ring 14. The inner wall of the push groove 15 has a sealing ring 11 on the top plate 10, which is squeezed by the pressure ring 12. The bottom end of the connecting groove 14 has a push groove 15, the top surface of the push groove 15 has a top groove 16, and the top surface of the top groove 16 has a sealing groove 17. The push groove 15 provides a path for the adjustment structure, and the top groove 16 provides a path for the movement of the top plate 10. The top plate 10 slides in the sealing groove 17. The bottom end of the top plate 10 has a chamfered structure. The inclined side of plate 10 is parallel to the inclined side of slope 7. The two-dimensional end face of top plate 10 has a "T" shaped structure. The horizontal plate of top plate 10 has a "ring" shaped structure. The horizontal plate of top plate 10 is located in sealing groove 17. A retaining ring 18 is fixed at the upper end of sleeve head 1. The retaining ring 18 fits with sealing groove 17. The end face size of sealing groove 17 is equal to that of pressure ring 12. Pressure ring 12 is fixed on the lower surface of connecting plate 13. Connecting plate 13 and pressure ring 12 are integrally formed.

[0035] Specifically, after aligning the casing head 1 with the tubing head 2, the operator screws them together along the connecting ring 4. As the connecting ring 4 is screwed downwards into the connecting groove 14, the adjusting ring 5 on its lower surface gradually contacts the ball 8. During the contact process, as the adjusting ring 4 continues to press down, the ball 8 rotates within the push frame 6 and simultaneously drives the push frame 6 to slide along the push groove 15. (Refer to...) Figure 5 , Figure 9 and Figure 14 When the adjusting ring 5 contacts the ball 8, the ball 8 rotates in the direction of the force applied, but the direction is uncontrollable. Figure 14It is known that the opening of the push frame 6 is chamfered, and only 30% of the volume of the ball 8 is exposed to prevent the ball 8 from detaching from the push frame 6. This ensures that the ball 8 is not stuck by the protruding baffle of the push frame 6 opening when rotating. Due to the tangency of the ball 8, the continued downward pressure of the adjusting ring 4 will push the push frame 6 to move. During this process, the ramp 7 at the upper right corner of the push frame 6 gradually approaches and presses against the chamfered surface at the bottom of the top plate 10. The ramp 7 and the chamfer cooperate to form a thrust ramp, gradually pushing the top plate 10 upward, so that the sealing ring 11 on the top plate 10 is pressed against the pressure ring 12, completing the closing action of the sealing structure. The spring 9 provides elastic force and ensures that the structure of the push frame 6 can self-reset. The top plate 10 rises smoothly under the guidance of the "T" shaped structure and slides stably in the sealing groove 17. The sealing ring 11 is in close contact with the pressure ring 12. Figure 5 The dimensions of the pressure ring 12 and the sealing groove 17 are equal, as shown in the reference. Figure 13 Under the action of the retaining ring 18, the pressure ring 12 can more easily press down on the sealing ring 17 to achieve a sealing effect, prevent oil leakage, achieve environmental protection effect, eliminate environmental pollution, and finally, without the use of any external bolts, the upper and lower structures of the wellhead can be quickly, efficiently and safely sealed and connected.

[0036] In use, the operator aligns the casing head 1 with the tubing head 2 and screws them together along the connecting ring 4. As the connecting ring 4 is screwed downwards into the connecting groove 14, the adjusting ring 5 on its lower surface gradually contacts the ball 8. During the contact process, as the adjusting ring 4 continues to press down, the ball 8 rotates within the push frame 6 and simultaneously drives the push frame 6 to slide along the push groove 15. (Refer to...) Figure 5 , Figure 9 and Figure 14 When the adjusting ring 5 contacts the ball 8, the ball 8 rotates in the direction of the force applied, but the direction is uncontrollable. Figure 14 It is known that the opening of the push frame 6 is chamfered, and only 30% of the volume of the ball 8 is exposed to prevent the ball 8 from detaching from the push frame 6. This ensures that the ball 8 is not stuck by the protruding baffle of the push frame 6 opening when rotating. Due to the tangency of the ball 8, the continued downward pressure of the adjusting ring 4 will push the push frame 6 to move. During this process, the ramp 7 at the upper right corner of the push frame 6 gradually approaches and presses against the chamfered surface at the bottom of the top plate 10. The ramp 7 and the chamfer cooperate to form a thrust ramp, gradually pushing the top plate 10 upward, so that the sealing ring 11 on the top plate 10 is pressed against the pressure ring 12, completing the closing action of the sealing structure. The spring 9 provides elastic force and ensures that the structure of the push frame 6 can self-reset. The top plate 10 rises smoothly under the guidance of the "T" shaped structure and slides stably in the sealing groove 17. The sealing ring 11 is in close contact with the pressure ring 12. Figure 5 The dimensions of the pressure ring 12 and the sealing groove 17 are equal, as shown in the reference. Figure 13Under the action of the retaining ring 18, the pressure ring 12 can more easily press down on the sealing ring 17 to achieve a sealing effect, prevent oil leakage, achieve environmental protection effect, eliminate environmental pollution, and finally, without the use of any external bolts, the upper and lower structures of the wellhead can be quickly, efficiently and safely sealed and connected.

[0037] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An environmentally friendly oil wellhead device, comprising a casing head (1) and a tubing head (2), and a connecting disc (13) fixed to the lower surface of the tubing head (2), characterized in that: The upper end of the sleeve head (1) is provided with a connecting groove (14), and a connecting ring (4) is screwed into the inner ring of the connecting groove (14). The connecting ring (4) is fixed on the lower surface of the connecting plate (13). An adjusting ring (5) is fixed on the lower surface of the connecting ring (4). The adjusting ring (5) pushes the top plate (10) to move vertically through the adjusting structure. A sealing ring (11) is provided on the top plate (10), and the sealing ring (11) is squeezed by the pressure ring (12).

2. The environmentally friendly oil wellhead device according to claim 1, characterized in that: The oil pipe head (2) and the connecting plate (13) are integrally formed, the connecting ring (4) and the connecting plate (13) are integrally formed, and the inner ring of the connecting ring (4) is screwed to the connecting groove (14).

3. The environmentally friendly oil wellhead device according to claim 1, characterized in that: The bottom end of the connecting groove (14) is provided with a push groove (15), the top surface of the push groove (15) is provided with a top groove (16), the top surface of the top groove (16) is provided with a sealing groove (17), the push groove (15) provides a path for the adjustment structure, and the top groove (16) provides a path for the movement of the top plate (10).

4. The environmentally friendly oil wellhead device according to claim 3, characterized in that: The inner ring at the bottom of the adjusting ring (5) is chamfered. The adjusting structure includes a push frame (6), a ball (8), a ramp (7) and a spring (9). The ball (8) is movably connected inside the push frame (6). The opening diameter of the push frame (6) is smaller than the diameter of the ball (8). One end of the ball (8) is located outside the push frame (6), and one end of the ball (8) is in contact with the inner ring of the adjusting ring (5). The ball (8) is tangent to the inner wall of the push frame (6). The ramp (7) has a chamfered structure. The ramp (7) is located at the upper right corner of the push frame (6). One end of the spring (9) is fixed to the surface of the push frame (6), and the other end of the spring (9) is fixed to the inner wall of the push groove (15).

5. The environmentally friendly oil wellhead device according to claim 4, characterized in that: The top plate (10) slides in the sealing groove (17). The bottom end of the top plate (10) has a chamfered structure. The inclined side of the top plate (10) is parallel to the inclined side of the slope (7). The two-dimensional end face of the top plate (10) has a "T" shaped structure. The horizontal plate of the top plate (10) has a "ring" shaped structure.

6. An environmentally friendly oil wellhead device according to any one of claims 3-5, characterized in that: The horizontal plate of the top plate (10) is located in the sealing groove (17). A retaining ring (18) is fixed at the upper end of the sleeve head (1). The retaining ring (18) fits into the sealing groove (17). The end face size of the sealing groove (17) is equal to that of the pressure ring (12). The pressure ring (12) is fixed on the lower surface of the connecting plate (13). The connecting plate (13) and the pressure ring (12) are integrally formed.

Images