A new type of sampling device for oil production wellhead

Abstract

The utility model relates to the upstream exploitation field of petroleum and natural gas industry discloses a kind of novel sampling device for oil well head, including sampling cylinder, sampling cylinder side is fixedly connected with oil outlet pipe, the oil outlet pipe is fixedly connected with oil tank away from the one end of sampling cylinder, sampling control assembly is arranged in the sampling cylinder, and the sampling control assembly includes handle, the handle bottom is fixedly connected with pivot one, the pivot one is fixedly connected with connecting rod away from the side of handle, the connecting rod is rotatably connected with fixed disc outside, the fixed disc top is fixedly connected with multiple connecting piles, and multiple The connecting pile is fixedly connected with inner ring gear between it. In the utility model, the rotary motion of handle 5 is converted into the linear motion of push rod 10 by the transmission mechanism that driving gear 13 is engaged with inner ring gear 23, drive rubber piston 9 linear sliding in sampling cavity, realize the rubber plug wear problem caused by traditional rotary screw.

Description

Technical Field

[0001] This utility model relates to the upstream extraction field of the oil and gas industry, and in particular to a novel sampling device for oil wellheads. Background Technology

[0002] In the process of oil extraction, real-time sampling and analysis of crude oil at the wellhead is a key link to ensure production efficiency and operational safety. As the core equipment that directly contacts the crude oil medium, the sampling device at the wellhead directly affects the sampling efficiency, sample representativeness and on-site operational safety. It plays an important supporting role in optimizing the extraction process in the construction of digital oilfields.

[0003] Currently, oil wellhead sampling is mainly done by manual piston sampling. Manual piston sampling devices typically consist of a sampling cylinder, piston rod, operating handle, and inlet / outlet ports. The operator manually pushes and pulls the handle to drive the piston to reciprocate within the sampling cylinder. The pressure difference generated by the change in the cavity volume draws crude oil into the sampling cylinder to complete the sampling. This mechanical structure achieves basic sampling functions and is widely used in conventional wellhead environments.

[0004] In existing technologies, the locking and fixing structure between the sampling device and the wellhead has obvious limitations. Traditional bolt-fastening structures require tightening multiple connecting bolts one by one with a wrench. In low-temperature environments in the field, the threads are prone to freezing and sticking, which increases the installation time. Moreover, multiple people are needed to complete the fixing operation. The screw-type rubber piston may loosen when the screw rotates, resulting in poor sealing. Therefore, a new type of sampling device for oil wellheads is proposed to solve the above problems. Utility Model Content

[0005] To overcome the above shortcomings, this utility model provides a novel sampling device for oil wellheads, which aims to improve the problem of cumbersome installation and disassembly steps of traditional bolt-fastened structures in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A novel sampling device for oil wellheads includes a sampling cylinder, an oil outlet pipe fixedly connected to one side of the sampling cylinder, an oil tank fixedly connected to the end of the oil outlet pipe away from the sampling cylinder, a sampling control assembly inside the sampling cylinder, the sampling control assembly including a first rotating shaft, a connecting rod fixedly connected to one side of the first rotating shaft, a fixed disk rotatably connected to the outside of the connecting rod, multiple connecting pins fixedly connected to the top of the fixed disk, internal gear rings fixedly connected between the multiple connecting pins, a second rotating shaft fixedly connected to the side of the connecting rod away from the first rotating shaft, a drive gear rotatably connected to the outside of the second rotating shaft, the drive gear meshing with the internal gear ring, a third rotating shaft fixedly connected to the side of the drive gear away from the connecting rod, a push rod rotatably connected to the outside of the third rotating shaft, a rubber piston fixedly connected to the end of the push rod away from the third rotating shaft, and a locking assembly at the top of the sampling cylinder;

[0008] As a further description of the above technical solution:

[0009] The locking assembly includes a connector, with multiple locking steel balls inside the connector, a push rod and a limiting ring fixedly connected to the outside of the connector, multiple springs fixedly connected between the push rod and the limiting ring, and a locking sleeve slidably connected to the outside of the connector.

[0010] As a further description of the above technical solution:

[0011] A fixing plate is fixedly connected inside the sampling cylinder, and the fixing plate is fixedly connected to one side of the fixing plate;

[0012] As a further description of the above technical solution:

[0013] The sampling cylinder has a sampling cavity inside, and the rubber piston is slidably connected inside the sampling cavity;

[0014] As a further description of the above technical solution:

[0015] The connector is fixedly connected to the end of the sampling cylinder, and a sealing ring is provided between the connector and the sampling cylinder;

[0016] As a further description of the above technical solution:

[0017] The locking sleeve has a tapered inner wall, the end of the push rod has a tapered pushing surface, the inner wall of the connector has a steel ball mounting groove, the end of the push rod abuts against the locking steel ball, and the locking steel ball is slidably connected inside the mounting groove;

[0018] As a further description of the above technical solution:

[0019] The outer wall of the sampling tube is provided with a handle, and the side of the handle near the sampling tube is fixedly connected to the end of the rotating shaft away from the connecting rod.

[0020] As a further description of the above technical solution:

[0021] The sampling tube is provided with an oil inlet valve near the connector, and the oil outlet pipe is provided with an oil outlet valve on the outside.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the rotational motion of the handle 5 is converted into the linear motion of the push rod 10 through the transmission mechanism of the drive gear 13 meshing with the internal gear ring 23 in the crude oil sample, which drives the rubber piston 9 to slide linearly in the sampling chamber, thus solving the problem of rubber plug wear caused by the traditional rotating screw.

[0024] 2. In this utility model, in the sampling interface connected to the locking assembly, one end of the push rod 15 is subjected to the elastic force of the spring 17, and the tapered push surface at the end continuously squeezes the locking steel ball 18 to provide power for locking, ensuring that the steel ball always presses against the target part, so as to solve the problem of oil and gas leakage caused by accidental loosening during the sampling process. Attached Figure Description

[0025] Figure 1 This is a three-dimensional schematic diagram of a novel sampling device for oil wellheads proposed in this utility model;

[0026] Figure 2 This is a cross-sectional schematic diagram of the sampling cylinder of a novel sampling device for oil wellheads proposed in this utility model;

[0027] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0028] Figure 4 This is a schematic diagram of the sampling control component of a novel sampling device for oil wellheads proposed in this utility model.

[0029] Legend:

[0030] 1. Locking sleeve; 2. Sampling cylinder; 3. Oil inlet valve; 4. Connector; 5. Handle; 6. Oil outlet valve; 7. Oil tank; 8. Oil outlet pipe; 9. Rubber piston; 10. Push rod; 11. Fixing plate; 12. Connecting rod; 13. Drive gear; 14. Fixing disc; 15. Push rod; 16. Limiting ring; 17. Spring; 18. Locking steel ball; 19. Shaft one; 20. Connecting pile; 21. Shaft two; 22. Shaft three; 23. Internal gear ring. Detailed Implementation

[0031] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0032] Reference Figure 1 , Figure 2 and Figure 4 This utility model provides an embodiment of a novel sampling device for oil wellheads, comprising a sampling cylinder 2, an oil outlet pipe 8 fixedly connected to one side of the sampling cylinder 2, an oil tank 7 fixedly connected to the end of the oil outlet pipe 8 away from the sampling cylinder 2, a sampling control component inside the sampling cylinder 2, the sampling control component including a rotating shaft 19, a connecting rod 12 fixedly connected to one side of the rotating shaft 19, a fixed plate 14 rotatably connected to the outside of the connecting rod 12, a plurality of connecting pins 20 fixedly connected to the top of the fixed plate 14, an internal gear ring 23 fixedly connected between the plurality of connecting pins 20, a rotating shaft 21 fixedly connected to the side of the connecting rod 12 away from the rotating shaft 19, and a rotating shaft 21 rotatably connected to the outside of the rotating shaft 21. The driving gear 13 meshes with the internal gear ring 23. A rotating shaft 22 is fixedly connected to the side of the driving gear 13 away from the connecting rod 12. A push rod 10 is rotatably connected to the outside of the rotating shaft 22. A rubber piston 9 is fixedly connected to the end of the push rod 10 away from the rotating shaft 22. A locking assembly is provided at the top of the sampling cylinder 2. A fixing plate 11 is fixedly connected inside the sampling cylinder 2. The fixing plate 11 is fixedly connected to one side of the fixing plate 14. A sampling cavity is opened inside the sampling cylinder 2. The rubber piston 9 is slidably connected inside the sampling cavity. A handle 5 is provided on the outer wall of the sampling cylinder 2. The side of the handle 5 near the sampling cylinder 2 is fixedly connected to the end of the rotating shaft 19 away from the connecting rod 12.

[0033] Specifically, a novel sampling device for oil wellheads includes a sampling cylinder 2, which serves as the core support base of the device and provides an installation reference for the sampling control components. The sampling chamber inside the cylinder provides a sealed space for crude oil collection and simultaneously achieves a fixed connection with the oil outlet pipe 8 and adapts to the installation of locking components. One end of the oil outlet pipe 8 is rigidly connected to the sampling cylinder 2, and the other end is connected to an oil tank 7. Its main function is to transport crude oil from the sampling chamber. The oil tank 7 is a sealed storage component used to temporarily store the crude oil flowing in from the oil outlet pipe 8. In the sampling control components, the handle 5 is designed for easy gripping by the operator and input of manual power. The top of the rotating shaft 19 is fixed to the handle 5, and the bottom connecting rod 12 is responsible for accurately transmitting the power of the handle 5 to the connecting rod 12. One end of the connecting rod 12 is connected to the rotating shaft 19, the middle part rotates around the fixed plate 14, and the other end is connected to the rotating shaft 21, which acts as a power intermediary to drive the drive gear 13 to perform planar motion. The fixed plate 14 is fixed to the inner wall of the sampling cylinder 2 through the fixed plate 11, and its edge is supported by multiple connecting pins 20 to form a rigid base for the transmission component, which limits the radial displacement during the transmission process. The two ends of the connecting pins 20 are fixed to the fixed plate 14 and the internal gear ring 23 respectively, serving as a connection. The internal gear ring 23 provides support, ensuring its stable position and parallelism to the axis of the sampling cylinder 2. The inner teeth of the internal gear ring 23 mesh with the driving gear 13, constraining its movement through its stationary nature. This causes the driving gear 13 to rotate simultaneously with its revolution around the central axis. The center of the driving gear 13 rotates around the second rotating shaft 21. Through meshing with the internal gear ring 23, it converts planar motion into its own rotation and revolution, driving the push rod 10 through the third rotating shaft 22 on its end face. The second rotating shaft 21 is fixedly connected to the end of the connecting rod 12, providing rotational support for the driving gear 13 and moving synchronously with the connecting rod 12. The rotating shaft 22 is fixed at one end to the drive gear 13 and rotatably connected to the push rod 10 at the other end. It is responsible for transmitting the motion of the drive gear 13 to the push rod 10. One end of the push rod 10 rotates around the rotating shaft 22 and the other end is connected to the rubber piston 9. It can absorb the radial displacement generated by the revolution of the drive gear 13 and only transmit the axial motion to the rubber piston 9. The outer diameter of the rubber piston 9 is precisely matched with the inner diameter of the sampling chamber. One end of the fixing plate 11 is fixed to the inner wall of the sampling cylinder 2 and the other end is rigidly connected to the fixing plate 14. Its main function is to fix the base of the sampling control component and ensure the structural stability during the transmission process.

[0034] Reference Figure 1 - Figure 3The locking assembly includes a connector 4, which has multiple locking steel balls 18 inside. A push rod 15 and a limiting ring 16 are fixedly connected to the outside of the connector 4. Multiple springs 17 are fixedly connected between the push rod 15 and the limiting ring 16. A locking sleeve 1 is slidably connected to the outside of the connector 4. The connector 4 is fixedly connected to the end of the sampling cylinder 2. A sealing ring is provided between the connector 4 and the sampling cylinder 2. The locking sleeve 1 has a conical inner wall inside. The end of the push rod 15 abuts against the locking steel balls 18. The locking steel balls 18 are slidably connected inside the mounting groove. The push rod 15 pushes the locking steel balls 18 to slide inside the mounting groove. An oil inlet valve 3 is provided near the connector 4 in the sampling cylinder 2, and an oil outlet valve 6 is provided on the outside of the oil outlet pipe 8.

[0035] Specifically, in the locking assembly, the connector 4 is fixed to the top of the sampling cylinder 2. An internal groove for mounting a locking steel ball 18 is provided. Externally, a push rod 15, a limiting ring 16, and a locking sleeve 1 are installed. A sealing ring between the connector 4 and the sampling cylinder 2 prevents crude oil leakage from the connection. The locking steel ball 18 is placed in the groove of the connector 4. Under the pushing force of the push rod 15, it can partially extend out of the inner wall of the connector 4 to engage with the wellhead connector for locking. Alternatively, it can retract into the groove under the pressure of the locking sleeve 1 to release the lock. One end of the push rod 15 is subjected to the elastic force of the spring 17, which continuously compresses the locking steel ball 18 through the tapered pushing surface at the end, providing power for locking. The limiting ring 16 is fixed to the outside of the connector 4 to limit the position of the spring 17, providing a support point for the spring 17 and ensuring that the spring 17 can stably apply elastic force. The spring 17 is connected to the push rod. Between the push rod 15 and the limiting retaining ring 16, the push rod 15 is kept in a pushing state against the locking steel ball 18. The locking sleeve 1 slides outside the connector 4. Its inner conical wall can squeeze the locking steel ball 18. When sliding upward, the conical inner wall releases the constraint on the locking steel ball 18. The locking steel ball 18 extends under the push of the push rod 15 to achieve locking. When sliding downward, it squeezes the locking steel ball 18 back and releases the locking state. The oil inlet valve 3 is set at the sampling cylinder 2 near the connector 4. It is used to control the flow of crude oil from the wellhead into the sampling chamber. When sampling, the valve is opened to allow crude oil to flow in. After sampling, it is closed to seal the chamber. The oil outlet valve 6 is installed on the oil outlet pipe 8. It is responsible for controlling the flow of crude oil in the sampling chamber into the oil tank 7 through the oil outlet pipe 8. It is opened when flushing the chamber to allow crude oil to circulate. After sampling, it is opened to discharge the sample into the oil tank 7.

[0036] Working principle: Before operation, the connector 4 at the top of the device needs to be aligned with the wellhead sampling interface. At this time, slide the locking sleeve 1 outside the connector 4 upward. The inner conical wall of the sleeve releases the squeezing constraint on the locking steel ball 18 in the steel ball mounting groove of the connector 4. Under the elastic force of the spring 17, the push rod 15 pushes the locking steel ball 18 along the mounting groove towards the inner wall of the connector 4 through the tapered push surface at the end. Part of the steel ball is embedded in the annular groove of the wellhead interface, realizing the rigid locking between the device and the wellhead. At the same time, the sealing ring between the connector 4 and the sampling cylinder 2 is compressed and deformed, sealing the gap between the two and preventing crude oil from leaking from the connection. This completes the fixed sealing before sampling. Close the oil outlet valve 6 on the oil outlet pipe 8, open the oil inlet valve 3 near the connector 4 of the sampling cylinder 2. Under its own pressure, the crude oil at the wellhead enters the sampling chamber inside the sampling cylinder 2 through the oil inlet valve 3, expelling the residual air in the chamber. Open the oil outlet valve 6, allowing the crude oil to flow into the oil tank 7 through the sampling chamber and the oil outlet pipe 8. The operator holds the handle 5 and applies rotational power. The handle 5 drives the bottom fixed rotating shaft 19 to move synchronously. The rotating shaft 19 transmits power to the connecting rod 12 fixed thereto. The connecting rod 12 swings in a lever-like manner around the fixed plate 14 that is rotatably connected in the middle. The end of the connecting rod 12 away from the rotating shaft 19 drives the fixed plate 12 to move synchronously. The rotating shaft 21 performs planar motion. The driving gear 13 externally connected to the rotating shaft 21 meshes with the internal gear ring 23 fixed by multiple connecting piles 20. While rotating with the rotating shaft 21, it also rotates on its own axis. The rotating shaft 22 fixed on the side of the driving gear 13 away from the connecting rod 12 moves synchronously with the driving gear 13, thereby driving the externally connected push rod 10. In the combined motion of the driving gear 13, the push rod 10 transmits axial linear motion to the rubber piston 9 fixed at its end, pushing the rubber piston 9 to slide upward along the axis of the sampling chamber. The volume of the sampling chamber increases and the pressure decreases. Under the action of the pressure difference, the crude oil at the wellhead continues to pass through the oil inlet valve. 3. Enter the sampling chamber until the rubber piston 9 slides to the upper limit of the chamber to complete the sampling action. At this time, close the oil inlet valve 3 to seal the crude oil sample in the chamber. Then open the oil outlet valve 6 and operate the handle 5 in the opposite direction. Through the above transmission path, drive the push rod 10 to pull the rubber piston 9 to slide down along the axis of the sampling chamber, squeezing the crude oil sample in the chamber. The sample flows into the oil tank 7 through the oil outlet pipe 8 for temporary storage. After the sampling operation is completed, slide the locking sleeve 1 down. Its conical inner wall squeezes the locking steel ball 18 and retracts it along the installation groove to the outside of the connector 4, disengaging it from the wellhead interface slot and releasing the locking state. The device can then be removed from the wellhead, completing the entire sampling process.

[0037] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model 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 utility model should be included within the protection scope of the present utility model.

Claims

1. A novel sampling device for oil wellheads, comprising a sampling cylinder (2), characterized in that: An oil outlet pipe (8) is fixedly connected to one side of the sampling cylinder (2), and an oil tank (7) is fixedly connected to the end of the oil outlet pipe (8) away from the sampling cylinder (2). A sampling control component is provided inside the sampling cylinder (2). The sampling control component includes a rotating shaft (19). A connecting rod (12) is fixedly connected to one side of the rotating shaft (19). A fixed disk (14) is rotatably connected to the outside of the connecting rod (12). Multiple connecting pins (20) are fixedly connected to the top of the fixed disk (14). An internal gear ring (23) is fixedly connected between the multiple connecting pins (20). A rotating shaft two (21) is fixedly connected to the side of the connecting rod (12) away from the rotating shaft one (19). A driving gear (13) is rotatably connected to the outside of the rotating shaft two (21). The driving gear (13) meshes with the internal gear ring (23). A rotating shaft three (22) is fixedly connected to the side of the driving gear (13) away from the connecting rod (12). A push rod (10) is rotatably connected to the outside of the rotating shaft three (22). A rubber piston (9) is fixedly connected to the end of the push rod (10) away from the rotating shaft three (22). A locking assembly is provided on the top of the sampling cylinder (2).

2. The novel sampling device for oil wellheads according to claim 1, characterized in that: The locking assembly includes a connector (4), which has multiple locking steel balls (18) inside. A top rod (15) and a limiting ring (16) are fixedly connected to the outside of the connector (4). Multiple springs (17) are fixedly connected between the top rod (15) and the limiting ring (16). A locking sleeve (1) is slidably connected to the outside of the connector (4).

3. The novel sampling device for oil wellheads according to claim 1, characterized in that: The sampling tube (2) is fixedly connected to a fixing plate (11), which is fixedly connected to one side of the fixing disk (14).

4. A novel sampling device for oil wellheads according to claim 1, characterized in that: The sampling cylinder (2) has a sampling cavity inside, and the rubber piston (9) is slidably connected inside the sampling cavity.

5. A novel sampling device for oil wellheads according to claim 2, characterized in that: The connector (4) is fixedly connected to the end of the sampling tube (2), and a sealing ring is provided between the connector (4) and the sampling tube (2).

6. A novel sampling device for oil wellheads according to claim 2, characterized in that: The locking sleeve (1) has a tapered inner wall, the top rod (15) has a tapered push surface at its end, the connector (4) has a steel ball mounting groove on its inner wall, the end of the top rod (15) abuts against the locking steel ball (18), and the locking steel ball (18) is slidably connected inside the mounting groove.

7. A novel sampling device for oil wellheads according to claim 1, characterized in that: The outer wall of the sampling tube (2) is provided with a handle (5), and the side of the handle (5) near the sampling tube (2) is fixedly connected to the end of the rotating shaft (19) away from the connecting rod (12).

8. A novel sampling device for oil wellheads according to claim 2, characterized in that: The sampling tube (2) is provided with an oil inlet valve (3) near the connector (4), and the oil outlet pipe (8) is provided with an oil outlet valve (6) on the outside.

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