Wellhead oil return control device

Abstract

This invention provides a wellhead oil return control device. The wellhead oil return control device is installed inside a nozzle sleeve and connected to the nozzle orifice of the nozzle sleeve. The wellhead oil return control device includes: a valve body with internal threads to the nozzle orifice; the valve body has a flow channel; the valve body has a large-diameter section and a small-diameter section; the connection between the large-diameter section and the small-diameter section forms an annular flange; the large-diameter section is connected to the outer wall of the nozzle; and the nozzle and the annular flange are spaced apart to form a sliding gap; a valve core assembly, which is slidably disposed within the sliding gap; the first end of the valve core assembly can abut against the end face of the nozzle extending into the large-diameter section to seal the flow channel. This invention solves the problem of crude oil leakage when the polished rod breaks off in the prior art.

Description

Technical Field

[0001] This invention relates to the field of oil extraction equipment technology, and more specifically, to a wellhead oil return control device. Background Technology

[0002] At the oil production site, when the sucker rod breaks off, the wellhead becomes uncontrolled, causing a large amount of system crude oil to flow back from the well's pipeline to the wellhead. This not only results in significant crude oil loss but also poses a substantial environmental risk.

[0003] Currently, there are two main ways to prevent crude oil backflow in the system line after the polished rod breaks off:

[0004] One method involves attaching a backup clamp below the suspension cable. If the polished rod breaks off, the backup clamp falls to the top of the packing box, preventing the polished rod from falling into the well and thus avoiding oil spills. However, this method has several drawbacks: the breakage point must be above the backup clamp; if the polished rod breaks off between the backup clamp and the top of the packing box, it can still cause a large-scale oil spill. Furthermore, if the rod clamp and polished rod are out of sync, the operating pumping unit can easily bend the polished rod or deform the top of the wellhead packing box, causing not only secondary disasters but also a large-scale oil spill.

[0005] Secondly, an anti-breakage packing box is designed. If the polished rod breaks off, the springs in the side chamber of the packing box will be ejected under pressure, sealing the central hole of the packing box and preventing oil leakage. However, this method has disadvantages: the anti-breakage packing box design focuses more on preventing breakage, weakening its inherent sealing function, making the wellhead prone to leakage; in cold northern winters, the springs and springs in the side chamber of the packing box may freeze and become stuck, failing to eject in time and losing their anti-breakage function.

[0006] In other words, the problem of crude oil leakage when the polished rod breaks off has not yet been completely solved in the existing technology. Summary of the Invention

[0007] The main objective of this invention is to provide a wellhead oil return control device to solve the problem of crude oil leakage when the polished rod breaks off in the prior art.

[0008] To achieve the above objectives, the present invention provides a wellhead oil return control device, which is installed inside a nozzle sleeve and connected to the nozzle orifice. The wellhead oil return control device includes: a valve body, which is internally threaded to the nozzle orifice, has a flow channel, and has a large-diameter section and a small-diameter section. An annular flange is formed at the connection between the large-diameter section and the small-diameter section. The large-diameter section is connected to the outer wall of the nozzle, and the nozzle and the annular flange are spaced apart to form a sliding gap; and a valve core assembly, which is slidably disposed within the sliding gap. The first end of the valve core assembly can abut against the end face of the nozzle extending into the large-diameter section to seal the flow channel.

[0009] Furthermore, the second end of the valve core assembly has a through hole, and when the second end of the valve core assembly abuts against the annular flange, the oil in the flow channel can flow out from the through hole.

[0010] Furthermore, the valve core assembly includes: a sealing ring; a valve core, the outer circumferential surface of which has a sealing groove, the sealing ring being disposed within the sealing groove, the sealing ring abutting against the oil nozzle to seal the flow passage; a pressure spring, the pressure spring being sleeved on the valve core; and a centralizer, the centralizer being disposed on the valve core to prevent the valve core from shifting.

[0011] Furthermore, the valve core includes: a valve head, which is frustum-shaped; a valve stem, which is connected to the large-diameter surface of the valve head; a pressure spring sleeved on the valve stem and abutting against the large-diameter surface; and a centralizer disposed on the valve stem.

[0012] Furthermore, the valve head has a sealing flange extending toward the valve body, and the sealing flange has a sealing groove.

[0013] Furthermore, the large-diameter surface of the valve head has a mounting groove, the valve stem is located in the mounting groove, and one end of the pressure spring abuts against the bottom of the mounting groove.

[0014] Furthermore, the centralizer has a through hole, and when the centralizer abuts against the annular protrusion, the oil in the flow channel can flow out from the through hole.

[0015] According to the technical solution of this invention, the wellhead oil return control device is installed inside the nozzle sleeve and connected to the nozzle orifice. The wellhead oil return control device includes: a valve body, which is internally threaded to the nozzle orifice, has a flow channel, and has a large-diameter section and a small-diameter section. An annular convex edge is formed at the connection between the large-diameter section and the small-diameter section. The large-diameter section is connected to the outer wall of the nozzle, and the nozzle and the annular convex edge are spaced apart to form a sliding gap; and a valve core assembly, which is slidably disposed within the sliding gap. The first end of the valve core assembly can abut against the end face of the nozzle that extends into the large-diameter section to seal the flow channel.

[0016] By installing a wellhead return oil control device, oil return can be prevented when the polished rod breaks off, effectively reducing crude oil leakage. The valve body is designed to connect with the internal thread of the nozzle orifice, ensuring the wellhead return oil control device can be stably installed within the nozzle sleeve. The valve body has a flow channel within which crude oil can flow. The valve core assembly is located within the flow channel, and its first end seals the channel, allowing crude oil to flow in only one direction, effectively preventing leakage and increasing the stability of the nozzle operation. The annular flange and the nozzle confine the valve core assembly within the sliding interval, preventing the risk of the valve core assembly detaching from the valve body and ensuring the stability of its operation. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0018] Figure 1 A schematic diagram of a wellhead oil return control device according to an optional embodiment of the present invention is shown.

[0019] The above figures include the following reference numerals:

[0020] 10. Valve body; 11. Annular flange; 12. Sliding gap; 131. Large diameter section; 132. Small diameter section; 20. Valve core assembly; 21. Sealing ring; 22. Valve core; 221. Valve head; 222. Valve stem; 223. Sealing flange; 23. Pressure spring; 24. Centralizer; 30. Oil nozzle; 31. Mounting flange. Detailed Implementation

[0021] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0023] In this invention, unless otherwise stated, directional terms such as "upper," "lower," "top," and "bottom" are generally used in relation to the direction shown in the accompanying drawings, or in relation to the vertical, perpendicular, or gravitational direction of the component itself; similarly, for ease of understanding and description, "inner" and "outer" refer to the inner and outer contours of each component itself, but the above directional terms are not intended to limit this invention.

[0024] To address the problem of crude oil leakage when the polished rod breaks off in existing technologies, this invention provides a wellhead oil return control device.

[0025] like Figure 1 As shown, the wellhead return oil control device is installed inside the nozzle sleeve and connected to the nozzle orifice. The wellhead return oil control device includes: a valve body 10 and a valve core assembly 20. The valve body 10 is internally threaded to the nozzle orifice and has a flow channel. The valve body 10 has a large diameter section 131 and a small diameter section 132. An annular convex edge 11 is formed at the connection between the large diameter section 131 and the small diameter section 132. The large diameter section 131 is connected to the outer wall of the nozzle 30. The nozzle 30 and the annular convex edge 11 are spaced apart to form a sliding gap 12. The valve core assembly 20 is slidably disposed in the sliding gap 12. The first end of the valve core assembly 20 can abut against the end face of the nozzle 30 that extends into the large diameter section 131 to seal the flow channel.

[0026] By installing a wellhead return oil control device, oil return can be avoided when the polished rod breaks off, effectively reducing crude oil leakage. The valve body 10 is designed to connect with the internal thread of the nozzle orifice, ensuring the wellhead return oil control device can be stably installed within the nozzle sleeve. The valve body 10 has a flow channel within which crude oil can flow. The valve core assembly 20 is located within the flow channel, and its first end seals the flow channel, allowing crude oil to flow in only one direction, effectively preventing leakage and increasing the stability of the nozzle 30. The annular flange 11 and the nozzle 30 confine the valve core assembly 20 within the sliding interval 12, preventing the valve core assembly 20 from detaching from the valve body 10 and ensuring the stability of its operation.

[0027] It should be noted that when the sucker rod is operating normally, the oil pressure on the side where the first end of the valve core assembly 20 is located is greater than the oil pressure on the side where the second end of the valve core assembly 20 is located, causing the valve core assembly 20 to be spaced apart from the annular flange 11, thereby allowing crude oil to flow through the flow channel. When the sucker rod breaks, the oil pressure on the side where the first end of the valve core assembly 20 is located is less than the oil pressure on the side where the second end of the valve core assembly 20 is located. Under the pressure at the second end, the first end of the valve core assembly 20 abuts against the nozzle 30 to seal the flow channel, achieving unidirectional flow of crude oil.

[0028] Specifically, the second end of the valve core assembly 20 has a through hole. When the second end of the valve core assembly 20 abuts against the annular flange 11, the oil in the flow channel can flow out through the through hole. The through hole at the second end prevents a seal between the second end and the annular flange 11, ensuring that liquid can always flow in or out of the second end, thus maintaining flow in the flow channel. The valve core assembly 20 can slide within the sliding interval 12. Depending on the pressure on both sides, both ends of the valve core assembly 20 can abut against the annular flange 11 or the oil nozzle 30. This confines the valve core assembly 20 within the sliding interval 12, preventing it from detaching from the valve body 10 and increasing the operational stability of the valve core assembly 20.

[0029] like Figure 1As shown, the valve core assembly 20 includes a sealing ring 21, a valve core 22, a pressure spring 23, and a centralizer 24. The outer circumferential surface of the valve core 22 has a sealing groove, and the sealing ring 21 is disposed within the sealing groove. The sealing ring 21 abuts against the annular protrusion 11 to seal the flow channel. The pressure spring 23 is sleeved on the valve core 22. The centralizer 24 is disposed on the valve core 22 to prevent the valve core 22 from shifting. The sealing ring 21 increases the tightness of the seal between the valve core assembly 20 and the annular protrusion 11, effectively reducing the risk of backflow and crude oil leakage. The pressure spring 23, in the event of backflow, can quickly spring the first end of the valve core 22 to the nozzle 30, causing the sealing ring 21 to abut against the annular protrusion 11 for sealing. The centralizer 24 ensures that the valve core 22 is always positioned in the center of the flow channel, preventing the valve core assembly 20 from shifting and causing a sealing failure.

[0030] It should be noted that the outer wall of the valve core assembly 20 and the inner wall of the valve body 10 are spaced apart so that crude oil can flow between the outer wall of the valve core assembly 20 and the inner wall of the valve body 10.

[0031] like Figure 1 As shown, the valve core 22 includes a valve head 221 and a valve stem 222. The valve head 221 is frustoconical in shape. The valve stem 222 is connected to the large-diameter surface of the valve head 221. A pressure spring 23 is sleeved on the valve stem 222 and abuts against the large-diameter surface. A centralizer 24 is disposed on the valve stem 222. At least a portion of the valve head 221 can extend into the channel of the nozzle 30 to form a primary seal, while the sealing ring 21 abuts against the nozzle 30 to form a secondary seal. The two seals can effectively prevent crude oil backflow and greatly reduce the risk of crude oil leakage. The pressure spring 23 abuts against the large-diameter surface and can apply elastic force to the large-diameter surface to drive the valve core 22 to move, so that the sealing ring 21 abuts against the nozzle 30.

[0032] like Figure 1 As shown, the valve head 221 has a sealing flange 223 extending towards the valve body 10, and the sealing flange 223 has a sealing groove. The sealing flange 223 provides an installation position for the sealing ring 21, which is engaged in the sealing groove, effectively reducing the risk of the sealing ring 21 detaching from the valve head 221, increasing the stability of the sealing ring 21's operation, and greatly reducing the risk of crude oil leakage.

[0033] like Figure 1 As shown, the large-diameter surface of the valve head 221 has a mounting groove, the valve stem 222 is located in the mounting groove, and one end of the pressure spring 23 abuts against the bottom of the mounting groove. The mounting groove reduces the possibility of misalignment and bending of the pressure spring 23, increasing the stability of the pressure spring 23 during operation.

[0034] like Figure 1As shown, the centralizer 24 has a through hole. When the centralizer 24 abuts against the annular flange 11, the oil in the flow channel can flow out from the through hole. When the second end of the valve core assembly 20 abuts against the annular flange 11, it is actually the centralizer 24 that abuts against the annular flange 11. The flow channel is connected to the through hole, allowing crude oil to flow through the through hole to extract the crude oil.

[0035] The nozzle assembly includes a nozzle 30 and the aforementioned wellhead return oil control device, which is connected to the outer wall of the nozzle 30. The nozzle equipped with the wellhead return oil control device has excellent return oil control capability, effectively preventing crude oil leakage and increasing the stability and safety of the nozzle operation.

[0036] like Figure 1 As shown, the outer periphery of the nozzle 30 has a mounting flange 31, which is located in the middle of the nozzle 30 and abuts against the end face of the large-diameter section 131 for sealing. This arrangement ensures the airtightness of the valve body 10 and prevents crude oil from flowing out. At the same time, the mounting flange 31 also facilitates the control of the length of the nozzle 30 extending into the large-diameter section 131, thereby controlling the length of the sliding interval 12 and thus controlling the space in which the valve core assembly 20 can move.

[0037] Optionally, the nozzle 30 is detachably connected to the large-diameter section 131. This arrangement facilitates the replacement and maintenance of the valve core assembly 20.

[0038] Alternatively, the nozzle 30 can be welded to the large-diameter section 131. This ensures a tight connection between the nozzle 30 and the large-diameter section 131, guaranteeing the stability of the valve body 10 during operation.

[0039] It should be noted that after the valve core assembly 20 is installed into the large diameter section 131, the oil nozzle 30 is then connected to the large diameter section 131.

[0040] This invention has a simple structure, is not affected by seasons or weather, will not cause secondary disasters during use, is highly responsive, inexpensive, and easy and quick to maintain and replace.

[0041] Obviously, the embodiments described above are merely some, not all, embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort should fall within the scope of protection of the present invention.

[0042] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0043] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in sequences other than those illustrated or described herein.

[0044] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wellhead oil return control device, characterized in that, The wellhead oil return control device is installed inside the nozzle sleeve and connected to the nozzle orifice. The wellhead oil return control device includes: The valve body (10) is connected to the outer wall of the nozzle (30). The valve body (10) has a flow channel and has a large diameter section (131) and a small diameter section (132). An annular convex edge (11) is formed at the connection between the large diameter section (131) and the small diameter section (132). The large diameter section (131) is connected to the outer wall of the nozzle (30). The nozzle (30) and the annular convex edge (11) are spaced apart to form a sliding interval (12). A valve core assembly (20) is slidably disposed within the sliding interval (12), and the first end of the valve core assembly (20) is able to abut against the end face of the oil nozzle (30) extending into the large diameter section (131) to seal the flow passage. Depending on the pressure on both sides of the valve core assembly (20), both ends of the valve core assembly (20) can abut against the annular flange (11) or the oil nozzle (30); The outer wall of the valve core assembly (20) is spaced apart from the inner wall of the valve body (10) so that crude oil flows between the outer wall of the valve core assembly (20) and the inner wall of the valve body (10); The valve core assembly (20) includes: Sealing ring (21); The valve core (22) has a sealing groove on its outer peripheral surface, and the sealing ring (21) is disposed in the sealing groove. The sealing ring (21) abuts against the oil nozzle (30) to seal the flow channel. A pressure spring (23) is sleeved on the valve core (22); A stabilizer (24) is provided on the valve core (22) to prevent the valve core (22) from shifting; The stabilizer (24) has a through hole, and when the stabilizer (24) abuts against the annular protrusion (11), the oil in the flow channel can flow out from the through hole.

2. The wellhead oil return control device according to claim 1, characterized in that, The valve core (22) includes: Valve head (221), wherein the valve head (221) is frustum-shaped; The valve stem (222) is connected to the large diameter surface of the valve head (221), the pressure spring (23) is sleeved on the valve stem (222) and abuts against the large diameter surface, and the stabilizer (24) is disposed on the valve stem (222).

3. The wellhead oil return control device according to claim 2, characterized in that, The valve head (221) has a sealing flange (223) extending toward the valve body (10), and the sealing flange (223) has the sealing groove.

4. The wellhead oil return control device according to claim 2, characterized in that, The valve head (221) has a mounting groove on its large diameter surface, the valve stem (222) is located in the mounting groove, and one end of the pressure spring (23) abuts against the bottom of the mounting groove.

Images