A multi-layer oil leakage prevention device for a Christmas tree oil inlet box

Abstract

The utility model relates to oil and gas exploitation engineering technical field discloses a kind of multilayer oil leakage prevention devices of Christmas tree oil receiving box, including two groups of main valve and wing valve being arranged in the outer wall of oil pipe, through oil pipe's polish rod, fixed on the tree cap above oil pipe, tree cap place integrated leakage prevention assembly and recovery assembly;The recovery assembly contains hollow conical groove plate, oil receiving box and the pipe, annular pipe, guide pipe connected, groove plate converges and imports annular pipe temporary storage by pipe and is guided to the leakage oil liquid, can be realized by three-way valve crude oil recovery;Two groups of main valve form double insurance, cooperate the pressure sensor in the top of oil pipe, can realize grading control flow and safety isolation in operation, emergency and maintenance scene.The device is through initiative sealing, passive recovery, multilayer collaborative design of double control flow, significantly improve the reliability of wellhead leak prevention, adapt high pressure high load oil production condition, have security and environmental protection.

Description

Technical Field

[0001] This utility model relates to the field of oil and gas extraction engineering technology, specifically to a multi-layer oil leakage prevention device for an oil wellhead receiving box. Background Technology

[0002] In oil and gas extraction operations, the wellhead, as a core piece of equipment, is connected to the downhole pumping unit and the surface pumping unit via a polished rod to extract and transport crude oil. The polished rod undergoes high-frequency up-and-down reciprocating motion during pumping, and the area where it mates with the wellhead cap is a high-risk area for wellhead leaks. This area must ensure both the flexibility of the polished rod's movement and a reliable seal. If the seal fails, crude oil can easily leak or drip along the polished rod surface, not only wasting crude oil but also polluting the surrounding soil and water. Furthermore, the volatilization of crude oil can create flammable and explosive hazards, threatening operational safety.

[0003] A search revealed existing technology (application number: CN202010968784.2), which describes "a wellhead production tree". This utility model includes a wellhead oil delivery pipe, a cement foundation, and a circular fixing plate. The wellhead oil delivery pipe runs through the entire circular fixing plate and is welded to the circular fixing plate. The circular fixing plate has multiple through holes arranged in a ring array, and expansion bolts are installed in these through holes. The circular fixing plate is fixedly connected to the cement foundation using expansion bolts.

[0004] However, while existing technologies improve overall stability and prevent the dismantling and theft of the oil well tree, effectively avoiding unnecessary losses for enterprises, they still have some shortcomings: the spliced ​​structure of the sealing rubber ring is prone to leakage, and there is no dedicated oil leakage collection structure. Utility Model Content

[0005] The purpose of this utility model is to address the shortcomings of existing technologies by proposing a multi-layered oil leakage prevention device for the oil collection box of an oil well.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a multi-layer oil leakage prevention device for an oil well tree receiving box, wherein the main valve and the wing valve are both installed on the outer wall of the oil pipe to control or isolate oil from entering the surface engineering from the oil pipe; a polished rod is slidably installed inside the oil pipe and slidably connected to the tree cap to transmit power and drive downhole oil pumping; the tree cap is fixedly installed above the oil pipe, with a recovery component on the top and an internal leakage prevention component.

[0007] As a further description of the above technical solution:

[0008] The wing valve also includes: an oil outlet, fixedly installed on one side of the wing valve, for discharging crude oil; and a pressure sensor, fixedly installed on the top of the oil pipe, for detecting the pressure inside the pipe.

[0009] As a further description of the above technical solution:

[0010] The recycling assembly includes: an oil receiving box, which is fixedly connected to the trough plate, and the trough plate is fixedly connected to the conduit through it; the conduit is fixedly connected to the bottom annular pipe through a three-way valve, and the annular pipe is fixedly connected to the guide pipe through it; and the trough plate is detachably mounted on the tree cap.

[0011] As a further description of the above technical solution:

[0012] The leak-proof component includes: a frame, which is fixedly mounted on the top of the tree cap by bolts; a metal ring, which is detachably mounted in a groove on the top of the fluororubber ring; and bolts, which are fixedly connected to the metal ring and the fluororubber ring through the frame.

[0013] As a further description of the above technical solution:

[0014] The fluororubber ring is made of fluororubber, and its inner diameter is slightly smaller than the outer diameter of the polished rod.

[0015] As a further description of the above technical solution:

[0016] The trough plate is hollow and conical, and the conduit is connected to the groove at the bottom of the oil receiving box.

[0017] As a further description of the above technical solution:

[0018] The main valves are arranged in two sets.

[0019] This utility model has the following beneficial effects:

[0020] 1. The fluororubber ring, with an inner diameter slightly smaller than that of the polished rod, fits tightly against the polished rod. The metal ring and the frame are fixed with bolts to form a structural support. This dual protection effectively blocks the crude oil leakage path when the polished rod slides.

[0021] 2. The hollow conical groove plate efficiently collects any leaking crude oil, which is then directionally recovered through a flow guiding system composed of conduits and ring pipes. Combined with real-time monitoring by pressure sensors, this reduces crude oil waste and minimizes the impact of leakage on equipment and the environment, achieving integrated and efficient operation of leak prevention and recovery. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of a multi-layer oil leakage prevention device for an oil wellhead receiving box proposed in this utility model.

[0023] Figure 2 This is a partial structural diagram of a multi-layered leak-proof device for an oil wellhead receiving box proposed in this utility model. Figure 1 ;

[0024] Figure 3This is a partial structural diagram of a multi-layered leak-proof device for an oil wellhead receiving box proposed in this utility model. Figure 2 ;

[0025] Figure 4 This is a partial structural diagram of a multi-layered leak-proof device for an oil wellhead receiving box proposed in this utility model. Figure 3 ;

[0026] Legend: 1. Main valve; 2. Wing valve; 21. Oil outlet; 22. Pressure sensor; 3. Smooth rod; 4. Tree cap; 5. Oil collection box; 51. Conduit; 52. Ring pipe; 53. Guide pipe; 54. Groove plate; 6. Frame; 61. Metal ring; 62. Bolt; 63. Fluororubber ring. Detailed Implementation

[0027] 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.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The utility model will be further described in detail below with reference to the accompanying drawings.

[0029] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" 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 or an electrical connection; 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. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Example 1:

[0031] like Figures 1 to 4As shown in the figure, this embodiment provides a multi-layer oil leakage prevention device for an oil well tree junction box, including: a main valve 1 and a wing valve 2, both of which are installed on the outer wall of the oil pipe, for controlling or isolating oil from the oil pipe into the surface engineering; a polished rod 3, which is slidably installed inside the oil pipe and slidably connected to the tree cap 4, for transmitting power and driving downhole oil pumping; and a tree cap 4, which is fixedly installed above the oil pipe, with a recovery component on the top and an internal leakage prevention component.

[0032] In this embodiment, the leak-proof component and the recovery component constitute a multi-layer leak-proof device for an oil wellhead receiving box according to this application.

[0033] Understandable Figure 1 This illustration only schematically shows some components of a multi-layer leak-proof device for an oil wellhead receiving box. The actual shape, size, location, and construction of these components are not subject to change. Figure 1 Due to limitations, a multi-layer leak-proof device for an oil wellhead receiving box can also include, compared to... Figure 1 More or fewer parts.

[0034] It should also be understood that the flanges, valves, and pressure sensors were all purchased commercially and are common knowledge in the field. They are only used and not modified, so the control methods and circuit connections will not be described in detail.

[0035] In addition, in this embodiment, the main valve 1 and the wing valve 2 control the oil circuit opening and closing, the polished rod 3 reciprocates to transmit the oil pumping power, and the tree cap 4 carries the recovery and leak prevention components, thus realizing the basic support for oil circuit control, power transmission and leak prevention recovery.

[0036] It should also be noted that the pipe walls are all fixedly connected by flanges.

[0037] Specifically, the wing valve 2 also includes: an oil outlet 21, which is fixedly installed on one side of the wing valve 2 for discharging crude oil; and a pressure sensor 22, which is fixedly installed on the top of the oil pipe for detecting the pressure inside the pipe.

[0038] In this embodiment, crude oil is discharged from the oil outlet 21, and the pressure sensor 22 is fixedly installed at the top end face of the oil pipe. It can monitor the pressure data inside the pipe in real time. When the pressure is abnormal, it can promptly notify the operation and maintenance personnel for repair to prevent serious accidents such as blowouts.

[0039] Specifically, the recycling assembly includes: an oil receiving box 5, which is fixedly connected to a trough plate 54, and the trough plate 54 is fixedly connected to a conduit 51 through it; the conduit 51 is fixedly connected to an annular pipe 52 at the bottom through a three-way valve, and the annular pipe 52 is fixedly connected to a guide pipe 53 through it; and the trough plate 54 is detachably mounted on the tree cap 4.

[0040] As a preferred implementation, the leaked crude oil flows into the oil receiving box 5, is introduced into the conduit 51 through the trough plate 54, and is then discharged through the annular pipe 52 and the guide pipe 53, thereby realizing the collection and directional discharge of the leaked crude oil.

[0041] Specifically, the leak-proof component includes: a frame 6, which is fixedly mounted on the top of the tree cap 4 by bolts 62; a metal ring 61, which is detachably mounted in the groove on the top of the fluororubber ring 63; and bolts 62, which are fixedly connected to the metal ring 61 and the fluororubber ring 63 through the bolts.

[0042] In this embodiment, bolts 62 fix the skeleton 6, metal ring 61 and fluororubber ring 63. Fluororubber ring 63 fits into the smooth rod 3 to achieve a leak-proof seal between the smooth rod 3 and the tree cap 4.

[0043] Specifically, the fluororubber ring 63 is made of fluororubber, and its inner diameter is slightly smaller than the outer diameter of the smooth rod 3.

[0044] With this configuration, the fluororubber ring 63, due to its slightly smaller inner diameter, fits tightly against the polished rod 3, which enhances the sealing performance and reduces oil leakage.

[0045] Example 2:

[0046] Based on Example 1, in order to further improve the recycling efficiency, a collection device is arranged inside the oil receiving box 5;

[0047] Specifically, the trough plate 54 is a hollow cone shape, and the conduit 51 is connected to the groove opened at the bottom of the oil receiving box 5.

[0048] The hollow conical groove plate 54 guides the crude oil to the bottom groove of the oil receiving box 5, and then discharges it through the conduit 51, which can improve the efficiency of collecting leaked crude oil and ensure smooth discharge.

[0049] Example 3:

[0050] Based on Example 2, in order to improve the safety of the wellhead, a spare valve is arranged on one side of the tubing;

[0051] Specifically, the main valve 1 is set in two sets.

[0052] In this embodiment, two sets of main valves 1 are symmetrically distributed on the outer wall of the oil pipe. They can be opened and closed independently, improving the reliability of oil circuit control. They can also serve as backups for each other to deal with emergencies.

[0053] In actual use, the fluororubber ring 63 is in direct contact with the polished rod 3. Its inner diameter is slightly smaller than the outer diameter of the polished rod 3. Its own elasticity will make it fit tightly against the surface of the polished rod 3, forming the first sealing surface and preventing the high-pressure crude oil from seeping upward along the surface of the polished rod 3. The fluororubber ring 63 is fixed to the metal ring 61 at the top of the frame 6 by bolts 62, which ensures that the fluororubber ring 63 is always in contact with the polished rod 3 when the polished rod 3 moves up and down. At the same time, the bolts 62 can be adjusted to adjust the pressure between the fluororubber ring 63 and the polished rod 3 according to the sealing requirements under different working conditions. If the anti-leakage component has a small amount of leakage due to long-term wear, or if crude oil adhering to the surface of the polished rod 3 drips, the recovery component can collect the residual crude oil to avoid contaminating the wellhead or wasting it. The groove plate 54 is a hollow cone shape, which allows the leaked crude oil to slide down the cone surface and converge at the groove at the bottom of the groove plate 54. At the same time, the groove plate 54 is fixedly connected to the oil receiving box 5, and the oil receiving box 5 is connected to the conduit 51. The converged crude oil can flow through the groove to the conduit 51, and through the three-way valve and the ring pipe 52, it is finally guided to the guide pipe 53 to realize the centralized treatment of crude oil recovery. Pressure sensor 22 can provide timely feedback on the working status of the leak prevention components; at the same time, main valve 1 and wing valve 2 serve as auxiliary control components; when wellhead maintenance and repair are required, main valve 1 can be closed to isolate the crude oil in the tubing, and then pressure can be released through wing valve 2 to ensure the safety of the maintenance process; the setting of two sets of main valve 1 can prevent the failure of one set, and extend the service life through graded flow control, which is especially suitable for high-pressure and high-load oil wellhead scenarios, significantly improving the overall safety redundancy and operational stability of the device.

[0054] Fluororubber rings can also be used as other sealing materials to achieve a sealing effect. Fluororubber is not the only option; any material that can achieve a seal under high pressure, high temperature, and oil resistance is acceptable.

[0055] A pressure sensor is installed on the oil pipe; the sensor is electrically connected to the controller, which is the central hub of the entire system. It is responsible for receiving instructions, monitoring the status, and controlling the actions of each actuator. The pressure sensor monitors the pressure inside the pipe in real time and transmits the sensed signal to the controller, which then sends the data to the control center.

[0056] It should be noted that the controller can be a conventional known device that is controlled by a computer or other means. The detailed description of known functions and known components is omitted in the specific embodiments of this disclosure. In order to ensure the compatibility of the device, the operating methods used are consistent with the parameters of commercially available instruments.

[0057] 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 multi-layer leak-proof device for an oil wellhead receiving box, characterized in that: include: The main valve (1) and the wing valve (2) are both installed on the outer wall of the oil pipe to control or isolate oil from entering the ground engineering from the oil pipe; The polished rod (3) is slidably installed inside the tubing and slidably connected to the tree cap (4) to transmit power and drive downhole oil pumping; Tree cap (4) is fixedly installed above the oil pipe, with a recovery component on top and a leak-proof component inside.

2. The multi-layer leak-proof device for an oil wellhead receiving box according to claim 1, characterized in that: The wing valve (2) also includes: The oil outlet (21) is fixedly installed on one side of the wing valve (2) for discharging crude oil; A pressure sensor (22) is fixedly installed at the top of the oil pipe to detect the pressure inside the pipe.

3. The multi-layer leak-proof device for an oil wellhead receiving box according to claim 1, characterized in that: The recycling component includes: The oil receiving box (5) is fixedly connected to the trough plate (54), and the trough plate (54) is fixedly connected to the conduit (51) through it; The conduit (51) is fixedly connected to the bottom annular tube (52) via a three-way valve, and the annular tube (52) is fixedly connected to the guide tube (53) through it. The groove plate (54) is detachably mounted on the tree cap (4).

4. The multi-layer leak-proof device for an oil wellhead receiving box according to claim 1, characterized in that: The leak-proof component includes: The frame (6) is fixed to the top of the tree cap (4) by bolts (62); A metal ring (61) is detachably mounted in a groove at the top of a fluororubber ring (63); Bolt (62) is used to fix the metal ring (61) and fluororubber ring (63) through the bolt.

5. The multi-layer oil leakage prevention device for an oil wellhead receiving box according to claim 4, characterized in that: The fluororubber ring (63) is made of fluororubber, and its inner diameter is slightly smaller than the outer diameter of the smooth rod (3).

6. The multi-layer oil leakage prevention device for an oil wellhead receiving box according to claim 5, characterized in that: The trough plate (54) is hollow cone-shaped, and the conduit (51) is connected to the groove at the bottom of the oil receiving box (5).

7. The multi-layer leak-proof device for an oil wellhead receiving box according to claim 6, characterized in that: The main valve (1) is set in two groups.

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