Leakage gas detection sampler for packing box of oil pumping unit

Abstract

The invention relates to the technical field of detection equipment, in particular to an oil pumping unit packing box leakage gas detection sampler. The sampler comprises a sealing cylinder mechanism fixedly mounted on a packing box body, a jacking frame mechanism in sliding fit with the sealing cylinder mechanism, and a sampling bottle mechanism detachably inserted into the jacking frame mechanism. During sampling, the sampling bottle mechanism and the jacking frame mechanism are communicated with an air path by pressing down the sampling bottle mechanism, the jacking frame mechanism is driven to move downwards synchronously, the sealing cylinder mechanism is triggered to be tightened, an instantaneous dynamic sealing sampling cavity is formed for a sucker rod piece, and meanwhile leaked air is actively pressed into the sampling bottle by utilizing air pressure difference generated in the mechanism. External airflow interference is effectively isolated through a linkage type dynamic sealing structure, and the authenticity of sample components is ensured. The whole device can adopt a half-and-half split structure, so that convenient installation and controlled sampling in a non-machine state are realized, and the potential safety hazard of operation and the risk of environmental pollution are effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of detection equipment technology, specifically to a gas leak detector sampler for oil pumping unit packing box. Background Technology

[0002] During oilfield extraction, the sealing reliability of the packing box at the pumping unit directly affects production safety. The packing components inside the packing box are prone to wear during long-term reciprocating motion, leading to gaps between them and the sucker rod, and causing leakage of associated gas. This type of leaked gas typically contains hydrocarbons and hydrogen sulfide, which not only pollute the environment but are also flammable and explosive. Therefore, regularly sampling and testing leaked gases is an important means of assessing the equipment's operating status.

[0003] Currently, when sampling gas leaking from packing boxes on-site, the common method is to temporarily cover the suspected leak point of the packing box with a sampling bag (such as a cloth bag or plastic bag), rely on the bag to collect the leaking gas, and then use a handheld sampling pump to extract it.

[0004] However, this traditional sampling method has the following significant shortcomings in practical applications: Because the sampling bag cannot form an effective seal between the reciprocating sucker rod and the packing box, ambient air can easily enter the bag and mix with the leaked gas under the influence of outdoor natural wind, resulting in the collected sample concentration being far lower than the actual leak concentration, which seriously affects the accuracy of the test results.

[0005] The process of bagging, bundling, waiting for gas collection, and connecting an external pump is cumbersome. Furthermore, it is difficult to fix the sampling bags in the field environment, and the preparation time for a single sampling is long, making it difficult to achieve standardized and large-scale rapid testing.

[0006] If the sampling bag is covered for too long while the oil pump is running continuously, the high concentration of flammable gas that accumulates locally will increase the safety risks on site.

[0007] In summary, existing sampling methods have significant limitations in terms of sealing performance, sampling efficiency, and safety. Therefore, developing a sampling device that can dynamically cooperate with sucker rods, possesses good sealing performance, and is easy to operate has become an urgent need to improve the level of oilfield leak detection. Summary of the Invention

[0008] In order to overcome the above-mentioned technical problems, the purpose of this invention is to provide a gas leak detection sampler for oil pumping unit packing box, so as to solve the problems mentioned in the background art.

[0009] To achieve the above objectives, the present invention provides the following technical solution: A gas leak detection sampler for a pumping unit packing box includes a sucker rod, a packing box body, and a packing member installed in the packing box body. It further includes: a sampling bottle mechanism for collecting the gas to be detected; a jacking frame mechanism with a mounting position for mounting the sampling bottle mechanism, the sampling bottle mechanism being able to slide along the mounting position and synchronously displace the jacking frame mechanism; and a sealing cylinder mechanism fixedly mounted on the packing box body and covering the sucker rod, the sealing cylinder mechanism slidingly engaging with the jacking frame mechanism. Pressing down on the sampling bottle mechanism triggers the sealing cylinder mechanism to tighten and form a dynamically sealed sampling chamber on the sucker rod, while simultaneously drawing leaked gas into the sampling bottle mechanism through a pressure difference.

[0010] Preferably, the sampling bottle mechanism includes a bottle body, an inner stopper is slidably connected inside the bottle body, one end of the bottle body is provided with an air inlet / outlet and a sealing head for sealing the air inlet / outlet, the sealing head is slidably connected to the bottle body and elastically abutted by a spring.

[0011] Preferably, the top-moving frame mechanism includes a top frame, on which a connector is fixedly connected. The top frame has a groove corresponding to the bottle body, and the connector has a channel communicating with the bottle body.

[0012] Preferably, when the bottle body is installed in the groove of the top frame and is pressed down, the connector can push the sealing head to retract, thereby opening the air inlet and outlet.

[0013] Preferably, the top-moving frame mechanism further includes a fork fixedly connected to the top of the top frame, the fork being used to guide and limit the bottle body installed on the top frame.

[0014] Preferably, the top-moving frame mechanism further includes a pressure ring frame and a top spring member, wherein the top spring member is connected between the top frame and the pressure ring frame.

[0015] Preferably, the sealing cylinder mechanism includes a cylinder end, an inner cylinder body, and a cylinder lower seat. The cylinder end is fixed to the upper part of the inner cylinder body, and the cylinder lower seat is connected to the packing box body.

[0016] Preferably, a sealing element is fitted inside the cylinder end and sleeved on the sucker rod; when the jacking frame mechanism moves down, the pressure ring frame is squeezed by the top spring element, causing the opening to tighten and contact the sucker rod to form a seal.

[0017] Preferably, the sealing element is provided with a metal spring inside.

[0018] Preferably, a slip ring is slidably connected to the outside of the inner cylinder, and a corrugated airbag is provided below the slip ring and connected between the slip ring and the inner cylinder; when the top frame is pressed down, it can drive the slip ring to compress the corrugated airbag.

[0019] Preferably, the inner cylinder has a chamber inside, and an inner sliding plug is slidably connected in the chamber. An inner spring is connected to the inner sliding plug. The chamber is connected to the inside of the corrugated airbag through an arc air passage. The lower cylinder seat is connected to the connector through an air pipe. The inner cylinder is constructed as two symmetrical semi-cylindrical parts along its axial direction. One side of the two semi-cylindrical parts is connected by a hinge, and the other side is provided with an openable locking buckle.

[0020] Preferably, both the sealing cylinder mechanism and the top moving frame mechanism are constructed as structures that can be split in half.

[0021] Compared with the prior art, the beneficial effects of the present invention are: Traditional sampling bags are difficult to seal effectively due to their soft material and lack of dynamic interface with the sucker rod, which can easily lead to the mixing of ambient air and sample dilution. This device, through a mechanical linkage structure, drives the sealing component to tighten and fit tightly against the sucker rod while pressing down the sampling bottle, forming a relatively independent sealed chamber, which effectively reduces gas leakage and ensures that the sample composition is closer to the leaked original liquid. Traditional methods require multiple steps such as fixing the cover bag, waiting for gas collection, and external pump extraction. This device integrates sealing, pressurization, and sampling functions into one unit. Operators only need to perform a simple pressing action to complete the sampling process, without the need to carry an additional air pump or complicated gas collection tools, which improves the convenience of on-site operations. Each core component of this device adopts a split design and is fastened by side hinges and locking bolts (or quick-locking buckles, etc.). It can be stably installed on the top of the packing box from the side without stopping the pumping unit. Compared with the temporary binding of the sampling bag, its installation structure is more standardized and stable, reducing the safety risks for personnel operating near the reciprocating moving parts. The device is equipped with a special sampling bottle with an automatic sealing function. After sampling, the sealing head closes immediately under the action of a spring, which avoids leakage and contamination of the sample during transfer and transportation, and ensures that the submitted sample can truly reflect the actual leakage of the packing box. Prolonged use of sampling bags may lead to the accumulation of high concentrations of flammable gas inside. The sealing mechanism of this device is only closed at the moment of pressing for sampling. During non-sampling periods, the sealing component remains open, allowing leaked gas to be discharged normally and avoiding safety risks caused by gas accumulation. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the lower structure of the present invention; Figure 2 This is a schematic diagram of the upper structure of the present invention; Figure 3 This is a schematic cross-sectional view of the present invention; Figure 4 For the present invention Figure 3 Schematic diagram of the structure at point A; Figure 5 This is a cross-sectional structural schematic diagram of the sealing cylinder mechanism and the top moving frame mechanism of the present invention; Figure 6 This is a schematic diagram of the structure of the sealing component and sucker rod of the present invention; Figure 7 This is a schematic diagram of the sampling bottle mechanism of the present invention; Figure 8 This is the top-moving frame mechanism part of the present invention.

[0023] In the diagram: 11. Sucker rod; 12. Packing box; 13. Packing; 2. Sampling bottle mechanism; 21. Bottle body; 22. Inner stopper; 23. Sealing head; 3. Pushing frame mechanism; 31. Top frame; 311. Fork frame; 32. Connector; 33. Pressure ring frame; 34. Top spring; 4. Sealing cylinder mechanism; 41. Cylinder end; 42. Sealing component; 43. Inner cylinder; 431. Arc gas passage; 432. Inner sliding plug; 433. Inner spring; 44. Slip ring; 45. Corrugated air bladder; 46. Lower cylinder seat. Detailed Implementation

[0024] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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 are within the scope of protection of the present invention.

[0025] Example 1 A gas leak detection sampler for a pumping unit packing box includes a sucker rod 11, a packing box body 12, and a packing member 13 installed in the packing box body 12, wherein the sampler further includes: The sampling bottle mechanism 2 is used to collect leaked gas. The sampling bottle mechanism 2 includes a bottle body 21, an inner stopper 22 is slidably connected inside the bottle body 21, a groove is provided at one end of the bottle body 21 corresponding to the sealing head 23, and the sealing head 23 is slidably connected to the bottle body 21 through the groove. A spring is provided at the top of the sealing head 23, and the sealing head 23 is connected to the bottle body 21 through the spring. An inlet and outlet are provided at one end of the bottle body 21, and the inlet and outlet are blocked by the sealing head 23. The top-moving frame mechanism 3 includes a top frame 31, a connector 32 fixedly connected to the top frame 31, a groove provided on the top frame 31 corresponding to the bottle body 21, a fork 311 connected to the top of the top frame 31, the fork 311 being used to limit and guide the bottle body 21 downwards, and a top spring 34 and a pressure ring frame 33 are provided on the top frame 31, the top spring 34 being connected between the pressure ring frame 33 and the top frame 31; A sealing cylinder mechanism 4 is used to cover the leakage location of the sucker rod 11 and packing box 12. The sealing cylinder mechanism 4 includes a cylinder end 41, in which a sealing element 42 is inserted. The sealing element 42 is sleeved on the outside of the sucker rod 11. A metal spring is provided inside the sealing element 42. When the pressure ring frame 33 moves down, it squeezes the sealing element 42 so that the opening corresponding to the sucker rod 11 is tightened and contacts the sucker rod 11. An inner cylinder body 43 is fixedly connected to the lower part of the cylinder end 41. A slip ring 44 is slidably connected to the outside of the inner cylinder body 43. A lower part of the slip ring 44 is provided with A corrugated airbag 45 is connected between a slip ring 44 and an inner cylinder 43. The inner cylinder 43 has a chamber, which is connected to the corrugated airbag 45 through an arc air passage 431. An inner sliding plug 432 is slidably connected in the chamber. An inner spring 433 is provided on the inner sliding plug 432. The inner spring 433 is connected between the inner sliding plug 432 and the inner cylinder 43. A lower cylinder seat 46 is fixedly connected to the bottom of the inner cylinder 43. The lower cylinder seat 46 is connected to a connector 32 through an air pipe and is fixedly connected to the packing box 12.

[0026] Example 2 A gas leak detection sampler for a pumping unit packing box has the same basic components as the aforementioned embodiments, including a pumping rod 11, a packing box body 12, a packing component 13, a sampling bottle mechanism 2, a top moving frame mechanism 3, and a sealing cylinder mechanism 4. The functions and connections of each component remain unchanged.

[0027] The improvement of this embodiment is that, in order to facilitate installation at the pumping unit packing box that is already installed and in operation, the sealing cylinder mechanism 4 and the jacking frame mechanism 3 directly connected thereto are designed to be split in half.

[0028] Specifically, the inner cylinder 43 of the sealing cylinder mechanism 4 is constructed as two symmetrical half-cylinders along its axial direction. One side of the two half-cylinders is connected by a hinge, and the other side is equipped with an openable locking buckle. The cylinder end 41, sealing element 42, slip ring 44, and cylinder lower seat 46 are also designed as symmetrical split structures. The corrugated airbag 45 is also composed of two halves. The chamber containing the arc air passage 431, inner sliding plug 432, and inner spring element 433 is also symmetrically divided along its axis. The top frame 31 is divided into two half-frames, secured by side connectors. The pressure ring frame 33 is also designed as a split type.

[0029] During installation, the two half-cylinders of the sealing cylinder mechanism 4, which are in the open state, are placed on the outside of the sucker rod 11 from the side, ensuring that the leakage location of the packing box 12 is within the predetermined chamber, and then the cylinder is closed and locked. Next, the split-type jacking frame mechanism 3 is installed on top of the sealing cylinder mechanism 4, connecting the connector 32 to the gas pipe of the lower cylinder seat 46. This embodiment, through its detachable design, enables on-site sampling of the operating pumping unit without disassembling the sucker rod 11.

[0030] Working principle The device of this application is installed on the top of the packing box 12. When sampling is required, the operator inserts the sampling bottle mechanism 2 along the fork 311 into the slot of the top moving frame mechanism 3 and presses it downward: Opening the gas path: During the downward movement of the sampling bottle mechanism 2, the protrusion of the connector 32 pushes the sealing head 23 to retract, thereby opening the gas inlet and outlet of the bottle body 21, and connecting the connector 32 with the inside of the bottle body 21.

[0031] Dynamic sealing: Continuous pressing of the sampling bottle mechanism 2 causes the top moving frame mechanism 3 to move downwards together. The top frame 31 slides downwards along the axis of the inner cylinder 43, and the top spring 34 drives the pressure ring frame 33 to move downwards and squeeze the sealing member 42, causing its opening to shrink tightly and wrap around the sucker rod 11, forming a sealed sampling chamber.

[0032] Pressurized sampling: The top frame 31 continues to press down, pushing the slip ring 44 to compress the corrugated airbag 45. The gas inside the airbag enters the inner cylinder 43 chamber through the arc air passage 431, pushing the inner sliding plug 432 upward. Under the action of pressure difference, the leaked gas in the sealed chamber flows into the bottle body 21 through the lower seat 46, the air pipe, and the connector 32, pushing the inner plug 22 upward to complete the collection.

[0033] Reset and Sealing: After sampling, pull out the sampling bottle mechanism 2 upwards. The sealing head 23 instantly resets and seals the bottle opening under the action of the spring. After the downward pressure is lost, the inner spring 433 pushes the inner sliding plug 432 to reset, and the corrugated airbag 45 returns to its original state; the top spring 34 releases its stored force to drive the top frame 31 to reset, and the sealing component 42 returns to the open state, ensuring that leaked gas can be discharged normally without accumulation during non-sampling periods.

[0034] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pumping unit packing box leaked gas detection sampler, comprising a pumping rod, a packing box body and a packing piece installed in the packing box body, characterized in that, Also include: A sampling bottle mechanism for collecting the gas to be detected; A top drive mechanism provided with a mounting position for mounting the sampling bottle mechanism, which can slide along the mounting position and drive the top drive mechanism to move synchronously; A sealing cylinder mechanism fixedly installed on the packing box body and covering the outer periphery of the sucker rod, which is in sliding cooperation with the top drive mechanism; Wherein, pressing the sampling bottle mechanism can trigger the sealing cylinder mechanism to tighten and form a dynamic sealing sampling cavity for the sucker rod, while the leaked gas is extracted into the sampling bottle mechanism through the pressure difference.

2. The leak detector sampler for a rod pump rod-packing box according to claim 1, characterized in that: The sampling bottle mechanism includes a bottle cylinder body, a bottle inner plug is slidably connected in the bottle cylinder body, one end of the bottle cylinder body is provided with an air inlet and outlet port and a blocking head for blocking the air inlet and outlet port, the blocking head is in sliding connection with the bottle cylinder body and is elastically abutted by a spring.

3. A leak detector sampler for a rod pump lubricator according to claim 2, wherein: The top drive mechanism includes a top frame, a connector is fixedly connected to the top frame, the top frame is provided with a groove corresponding to the bottle cylinder body, and the connector is provided with a channel in communication with the bottle cylinder body.

4. The leak detector sampler for a rod pump rod-packing box according to claim 3, characterized in that: When the bottle cylinder body is installed in the groove of the top frame and is pressed downward, the connector can push the blocking head to retract, so that the air inlet and outlet port is opened.

5. The leak detector sampler for a rod pump rod-packing box of claim 3, wherein: The top drive mechanism further includes a fork frame fixedly connected to the top of the top frame, which is used for guiding and limiting the bottle cylinder body installed on the top frame.

6. A leak detector sampler for a rod pump rod-packing box according to claim 3, characterized in that: The top drive mechanism further includes a pressing ring frame and a top spring member, which is connected between the top frame and the pressing ring frame.

7. A leak detector sampler for a rod pump rod-packing box according to claim 6, characterized in that: The sealing cylinder mechanism includes a cylinder end head, an inner cylinder body and a cylinder lower seat, the cylinder end head is fixed to the upper part of the inner cylinder body, and the cylinder lower seat is connected to the packing box body.

8. A leak detector sampler for a rod pump rod-packing box according to claim 7, characterized in that: The cylinder end head is clamped with a blocking member sleeved outside the sucker rod; when the top drive mechanism moves downward, the pressing ring frame is pressed to the blocking member under the action of the top spring member, so that the opening of the blocking member is tightened and in contact with the sucker rod to form a seal.

9. A leak detector sampler for a rod pump rod-packing box according to claim 8, characterized in that: The blocking member is internally provided with a metal reed.

10. The leak detector sampler for a rod pump rod-packing box of claim 7, wherein: The outer part of the inner cylinder body is slidably connected with a sleeve slip ring, the sleeve slip ring is provided with a corrugated air bag connected between the sleeve slip ring and the inner cylinder body; when the top frame is pressed, the sleeve slip ring can compress the corrugated air bag.

11. A gas leak detector and sampler for a pumping unit packing box according to claim 10, characterized in that: The inner cylinder body is internally provided with a chamber, an inner sliding plug is slidably connected in the chamber, and an inner spring member is connected to the inner sliding plug; the chamber is in communication with the inside of the corrugated air bag through an arc air duct; the cylinder lower seat is connected with the connector through an air pipe, and the inner cylinder body is constructed as two symmetrical half cylinder members along the axial direction, one side of the two half cylinder members is connected through a hinge, and the other side is provided with an openable and closable locking buckle.

12. A leak detector sampler for a rod pump rod-packing box according to claim 1, characterized in that: The sealing cylinder mechanism and the top drive mechanism are both constructed as a structure that can be disassembled in half.

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