Differential pressure makeup uniflow valve

Abstract

The utility model discloses a differential pressure supply one-way valve, including upper casing and valve core assembly, upper casing is hollow cylinder, and upper casing side surface is seted up with valve core installation hole, and upper casing both ends are seted up with first oil pipe outer buckle and second oil pipe outer buckle respectively, and valve core assembly is installed in the valve core installation hole corresponding position, and the annular sealing groove is arranged on the inner wall of upper casing, and the annular sealing groove between upper casing and valve core assembly is inlayed with sealing ring. The utility model discloses with simple and reliable mechanical structure, effectively solved the traditional anticorrosion and scale prevention instrument easy to block and influence the industry problem of production, while ensuring the protection effect, greatly promoted the reliability and economy of production system.

Description

Technical Field

[0001] This utility model belongs to the field of oilfield production engineering technology and relates to a differential pressure replenishment flow valve. Background Technology

[0002] In the production operations of high water-cut oil wells, anti-corrosion and anti-scaling tools built into the tailpipe are commonly used to effectively address corrosion and scaling issues. Tools such as slow-release scale inhibitors and electrochemical descaling devices have played a positive role in practical applications. However, as these tools operate for extended periods, numerous problems inevitably arise. In the oil well environment, due to the presence of various minerals in the water, prolonged chemical reactions and physical precipitation processes produce scale such as CaCO3 and Fe3O4, along with corrosion products. These scales and corrosion products gradually accumulate and adhere inside the anti-corrosion and anti-scaling tools, eventually clogging the tool's channels. A significant proportion of oil wells experience malfunctions due to clogging of these tools. Once clogging occurs, it directly leads to interruption of pump fluid supply, affecting the normal production operation of the oil well and severely impacting the oilfield's stable production. It prevents the oilfield from continuously and stably outputting crude oil, disrupting the entire oilfield's production plan and hindering the stable acquisition of economic benefits. Traditional solutions to the problem of clogging of anti-corrosion and anti-scaling tools often require pulling out the entire well tubing for cleaning or replacing the tools directly. Each operation is time-consuming, and the well is completely shut down during that time, resulting in significant economic losses and high costs. More importantly, frequent operations such as pulling out the tubing, cleaning, or replacing tools cause severe wear on the tubing, degrading its performance and shortening its lifespan. This makes it more prone to recurring clogging problems, leading to a vicious cycle of "clogging-well repair-re-clogging," continuously increasing oilfield maintenance costs and the difficulty of production operations.

[0003] In existing technologies, check valves are often installed before and after anti-corrosion and anti-scaling tools to control fluid flow and alleviate or even prevent blockages during unidirectional fluid transmission. However, traditional check valves have a limitation: when the tubing becomes blocked, conventional check valves cannot automatically open the bypass channel, preventing fluid from continuing to flow through other paths. This means that once a blockage occurs, the fluid flow is completely cut off until manual repairs are taken, during which time the well must be shut down. Therefore, traditional check valves have certain limitations in dealing with tubing blockages. In my country, high water-cut oilfields are vast and commonly face the problem of blockages in anti-corrosion and anti-scaling tools. Every year, a large number of wells face production stoppages due to this issue, and the high costs put significant pressure on the economic efficiency of oilfields. Pipeline blockages also exist in other fields such as chemical engineering and wastewater treatment. Various chemical substances transported in pipelines may cause blockages due to chemical reactions or impurities. In wastewater treatment, suspended solids and sediments in the wastewater can also easily cause pipeline blockages. Therefore, there is an urgent need for low-cost, high-reliability emergency flow technology to solve the problem of timely restoration of normal fluid transport when pipelines are blocked, avoid a series of problems such as production stoppage and increased costs caused by blockage, and ensure the continuity of production and the stability of economic benefits. Utility Model Content

[0004] The purpose of this invention is to provide a differential pressure replenishment flow valve, which solves the problem of well shutdown caused by tool blockage in the tailpipe in the prior art.

[0005] The technical solution adopted by this utility model is a differential pressure replenishment single-flow valve, including an upper shell and a valve core assembly. The upper shell is a hollow cylinder with a valve core mounting hole on its side. The upper shell has a first oil pipe external buckle and a second oil pipe external buckle at both ends. The valve core assembly is installed at the corresponding position of the valve core mounting hole. An annular sealing groove is provided on the inner wall of the upper shell, and a sealing ring is embedded in the annular sealing groove between the upper shell and the valve core assembly.

[0006] The features of this utility model also include: The valve core assembly includes a valve core body. One end of the valve core body has a first through hole radially along the upper housing. The valve core body has several second through holes axially along the upper housing. The end of the second through hole away from the first through hole passes through the valve core body. The end of the second through hole near the first through hole is connected to the first through hole. A ball seat is provided at the connection between the first through hole and the second through hole.

[0007] A baffle is provided inside the second through hole, and the baffle is fixed to the valve core body at the end away from the first through hole in a detachable manner.

[0008] A spring is fixed to one end of the baffle near the first through hole, and a valve ball is provided at the other end of the spring, which matches the ball seat.

[0009] The baffle is a ring structure with several through holes or slits for fluid to pass through.

[0010] The baffle is fixed to the valve core body near the end of the second through hole by a threaded connection.

[0011] The outer periphery of the baffle is provided with external threads, and the inner side of the valve core body near the end of the second through hole is provided with internal threads that mate with the external threads of the baffle.

[0012] The spring is a stainless steel compression spring, used to ensure a tight fit between the valve ball and the ball seat.

[0013] The valve core body is a non-circular cylinder with a racetrack-shaped cross-section.

[0014] The sidewall of the valve core body consists of two opposing arc-shaped contact surfaces with the same radius of curvature, and two opposing planes. The arc-shaped contact surfaces are used for sliding engagement with the inner wall of the upper housing.

[0015] The radius of curvature of the arc-shaped contact surface on the side wall of the valve core body is equal to the radius of curvature of the semi-circular arc segment of the racetrack-shaped end face of the valve core body.

[0016] The beneficial effects of this utility model are: The utility model differential pressure replenishment flow valve, a fluid handling system with emergency protection function, has the following three core beneficial effects: 1. Ensuring Production Continuity: When downhole corrosion and scale prevention tools become clogged, causing a predetermined pressure difference between their inlet and outlet, this pressure difference automatically drives a check valve to open the bypass channel, allowing fluid to bypass the clogged tool and maintain flow. This mechanism effectively avoids problems such as abnormal pressure within the tubing and fluid supply interruption caused by tool blockage, thereby significantly reducing the risk of unplanned production stoppages and ensuring stable production of the oil well.

[0017] 2. Mode Switching: This utility model's differential pressure replenishment single-flow valve achieves dual-mode adaptive operation with "protection first, production backup." Under normal operating conditions, the system ensures that all fluid flows through the anti-corrosion and anti-scaling tools, fully utilizing their anti-corrosion and anti-scaling effectiveness to ensure the safety of downhole equipment and pump efficiency. Under abnormal blockage conditions, the system can automatically and quickly switch to bypass mode based on the differential pressure signal, prioritizing the passage of production fluid. This switching ensures optimal operation under different conditions.

[0018] 3. Improved Economic Efficiency and Environmental Friendliness: This utility model's differential pressure replenishment flow valve can effectively extend the well workover cycle caused by tool blockage, extending the pump inspection cycle by more than 6 months, significantly reducing the number of annual maintenance operations and related costs for a single well. Simultaneously, the increased production rate boosts output, while the reduced frequency of operations lowers potential environmental risks, achieving the dual goals of cost reduction, efficiency improvement, and green production.

[0019] In summary, this utility model of differential pressure replenishment single-flow valve, with its simple and reliable mechanical structure, effectively solves the industry problem of traditional anti-corrosion and anti-scaling tools being prone to clogging and affecting production. While ensuring the protective effect, it greatly improves the reliability and economy of the production system. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the differential pressure replenishment single-flow valve of this utility model; Figure 2 This is a cross-sectional view of the differential pressure replenishment single-flow valve of this utility model; Figure 3 This is a plan view of the differential pressure replenishment single-flow valve of this utility model; Figure 4 This is a schematic diagram of the first through hole structure of the differential pressure replenishment flow valve of this utility model; Figure 5 This is a schematic diagram of the baffle structure of the differential pressure replenishment single-flow valve of this utility model.

[0021] In the figure, 1. Upper housing; 1-1. Valve core mounting hole; 1-2. First oil pipe external thread; 1-3. Second oil pipe external thread; 1-4. Protective cover; 2. Valve core assembly; 2-1. Valve core body; 2-2. Valve ball; 2-3. Spring; 2-4. Baffle; 2-5. Sealing ring; 2-6. First through hole; 2-7. Second through hole. Detailed Implementation

[0022] The subject matter of this utility model disclosure will now be described more fully with reference to exemplary embodiments. However, the disclosed concepts may be implemented in different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. (By referring to the accompanying drawings...) Figure 1 The features of the embodiments disclosed herein and how to implement the features of the embodiments disclosed herein will become apparent from the embodiments described in more detail herein.

[0023] Unless the context explicitly specifies otherwise, references to elements (e.g., “the”) may include plural forms. For purposes of meaning and interpretation, the term “and / or” is intended to include any combination of the terms “and” and “or”. For example, “A and / or B” can be understood to mean “A, B, or A and B”. The terms “and” and “or” can be used in a connected or separate sense and can be understood as equivalent to “and / or”. For purposes of meaning and interpretation, the phrase “at least one of…” is intended to include the meaning of “at least one of the groups…”. For example, “at least one of A and B” can be understood to mean “A, B, or A and B”.

[0024] It will be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element from another. For example, without departing from the publicly stated teachings, the first element discussed below may be referred to as the second element. Similarly, the second element may also be referred to as the first element.

[0025] For ease of description, spatially relative terms such as “below,” “under,” “down,” “above,” and “above” may be used herein to describe the relationship of one element or feature to another element(s) as shown in the accompanying drawings. It will be understood that, in addition to the orientations depicted in the drawings, the spatially relative terms are intended to encompass different orientations of the device in use or operation. For example, if the device in the drawings is flipped, then an element described as “below” or “under” other elements or features will be oriented “above” or “above” other elements or features. Thus, the term “below” can include both above and below orientations. The device may be oriented in other ways, and the spatially relative descriptive terms used herein should be interpreted accordingly.

[0026] The terminology used herein is for the purpose of describing embodiments of the present invention and is not intended to limit the disclosure. As used herein, the singular form “a” is intended to include the plural form as well, unless the context explicitly indicates otherwise. It will be further understood that, when used in this specification, the terms “comprising,” “including,” “containing,” and / or “having” indicate the presence of a stated feature, integral, step, operation, element, and / or component, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. Each of the features of the various disclosed embodiments can be combined in whole or in part, and various technically interconnected and driving relationships are possible. Each embodiment can be implemented independently of each other or can be implemented together in association.

[0027] For ease of explanation, the dimensions of the components in the accompanying drawings may be exaggerated. In other words, since the dimensions and thicknesses of the components in the accompanying drawings can be arbitrarily shown for ease of explanation, the following embodiments disclosed in this utility model are not limited thereto.

[0028] Unless otherwise specified, all terms used in this invention (including technical and scientific terms) shall have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms defined in commonly used dictionaries shall be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and unless expressly defined herein, these terms shall not be interpreted in an idealized or overly formal sense.

[0029] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0030] Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3 As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2.

[0031] The first oil pipe external thread 1-2 and the second oil pipe external thread 1-3 can be internal or external threads.

[0032] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0033] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0034] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0035] The baffle 2-4 has several through holes or slits for fluid to pass through. The baffle 2-4 is fixed to the valve core body 2-1 near the end of the second through hole 2-7 by a threaded connection.

[0036] The outer periphery of the baffle 2-4 is provided with external threads, and the inner side of the valve core body 2-1 near the end of the second through hole 2-7 is provided with internal threads that cooperate with the external threads of the baffle 2-4.

[0037] Spring 2-3 is a stainless steel compression spring, used to promote a tight fit between valve ball 2-2 and ball seat.

[0038] like Figure 5 As shown, the valve core body 2-1 is a non-circular cylinder, and the valve core body 2-1 has a racetrack-shaped cross-section.

[0039] The sidewall of the valve core body 2-1 is composed of two oppositely arranged arc-shaped contact surfaces with the same radius of curvature, and two oppositely arranged planes. The arc-shaped contact surfaces are used for sliding engagement with the inner wall of the upper housing 1.

[0040] The radius of curvature of the arc-shaped contact surface on the side wall of valve core body 2-1 is equal to the radius of curvature of the semi-circular arc segment of the racetrack-shaped end face of valve core body 2-1.

[0041] Example 1 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3 As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0042] In this embodiment, both the first oil pipe external thread 1-2 and the second oil pipe external thread 1-3 are external threads, which can be 55° tapered pipe threads conforming to GB / T7306 or 60° tapered pipe threads NPT conforming to GB / T12716.

[0043] Example 2 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3 As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0044] In this embodiment, both the first oil pipe external thread 1-2 and the second oil pipe external thread 1-3 are external threads, which can be 55° tapered pipe threads conforming to GB / T7306 or 60° tapered pipe threads NPT conforming to GB / T12716.

[0045] like Figure 4As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0046] Example 3 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3 As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0047] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0048] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0049] In this embodiment, both the first oil pipe external thread 1-2 and the second oil pipe external thread 1-3 are external threads, which can be 55° tapered pipe threads conforming to GB / T7306 or 60° tapered pipe threads NPT conforming to GB / T12716.

[0050] Example 4 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0051] In this embodiment, both the first oil pipe external thread 1-2 and the second oil pipe external thread 1-3 are internal threads. This design allows the valve to be directly screwed into a pipe or fitting with external threads. During installation, only the nut needs to be rotated instead of the valve body, making it suitable for space-constrained applications.

[0052] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0053] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0054] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0055] Example 5 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3 As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0056] In this embodiment, both the first oil pipe external thread 1-2 and the second oil pipe external thread 1-3 are internal threads. This design allows the valve to be directly screwed into a pipe or fitting with external threads. During installation, only the nut needs to be rotated instead of the valve body, making it suitable for space-constrained applications.

[0057] like Figure 4As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0058] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0059] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0060] The baffle 2-4 has several through holes or slits for fluid to pass through. The baffle 2-4 is fixed to the valve core body 2-1 near the end of the second through hole 2-7 by a threaded connection.

[0061] Example 6 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0062] In this embodiment, both the first oil pipe external thread 1-2 and the second oil pipe external thread 1-3 are internal threads. This design allows the valve to be directly screwed into a pipe or fitting with external threads. During installation, only the nut needs to be rotated instead of the valve body, making it suitable for space-constrained applications.

[0063] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0064] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0065] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0066] The baffle 2-4 has several through holes or slits for fluid to pass through. The baffle 2-4 is fixed to the valve core body 2-1 near the end of the second through hole 2-7 by a threaded connection.

[0067] The outer periphery of the baffle 2-4 is provided with external threads, and the inner side of the valve core body 2-1 near the end of the second through hole 2-7 is provided with internal threads that cooperate with the external threads of the baffle 2-4.

[0068] Example 7 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3 As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0069] In this embodiment, the first oil pipe outer threads 1-2 are external threads, and the second oil pipe outer threads 1-3 are internal threads. This configuration provides great connection flexibility for complex piping systems and can serve as a conversion interface between different standard threads.

[0070] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0071] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0072] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0073] The baffle 2-4 has several through holes or slits for fluid to pass through. The baffle 2-4 is fixed to the valve core body 2-1 near the end of the second through hole 2-7 by a threaded connection.

[0074] The outer periphery of the baffle 2-4 is provided with external threads, and the inner side of the valve core body 2-1 near the end of the second through hole 2-7 is provided with internal threads that cooperate with the external threads of the baffle 2-4.

[0075] Spring 2-3 is a stainless steel compression spring, used to promote a tight fit between valve ball 2-2 and ball seat.

[0076] Example 8 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0077] In this embodiment, the first oil pipe outer threads 1-2 are external threads, and the second oil pipe outer threads 1-3 are internal threads. This configuration provides great connection flexibility for complex piping systems and can serve as a conversion interface between different standard threads.

[0078] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0079] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0080] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0081] The baffle 2-4 has several through holes or slits for fluid to pass through. The baffle 2-4 is fixed to the valve core body 2-1 near the end of the second through hole 2-7 by a threaded connection.

[0082] The outer periphery of the baffle 2-4 is provided with external threads, and the inner side of the valve core body 2-1 near the end of the second through hole 2-7 is provided with internal threads that cooperate with the external threads of the baffle 2-4.

[0083] Spring 2-3 is a stainless steel compression spring, used to promote a tight fit between valve ball 2-2 and ball seat.

[0084] like Figure 5 As shown, the valve core body 2-1 is a non-circular cylinder, and the valve core body 2-1 has a racetrack-shaped cross-section.

[0085] Example 9 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0086] In this embodiment, the first oil pipe outer threads 1-2 are external threads, and the second oil pipe outer threads 1-3 are internal threads. This configuration provides great connection flexibility for complex piping systems and can serve as a conversion interface between different standard threads.

[0087] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0088] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0089] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0090] The baffle 2-4 has several through holes or slits for fluid to pass through. The baffle 2-4 is fixed to the valve core body 2-1 near the end of the second through hole 2-7 by a threaded connection.

[0091] The outer periphery of the baffle 2-4 is provided with external threads, and the inner side of the valve core body 2-1 near the end of the second through hole 2-7 is provided with internal threads that cooperate with the external threads of the baffle 2-4.

[0092] Spring 2-3 is a stainless steel compression spring, used to promote a tight fit between valve ball 2-2 and ball seat.

[0093] like Figure 5 As shown, the valve core body 2-1 is a non-circular cylinder, and the valve core body 2-1 has a racetrack-shaped cross-section.

[0094] The sidewall of the valve core body 2-1 is composed of two oppositely arranged arc-shaped contact surfaces with the same radius of curvature, and two oppositely arranged planes. The arc-shaped contact surfaces are used for sliding engagement with the inner wall of the upper housing 1.

[0095] Example 10 Differential pressure supply check valve, such as Figure 1 As shown, it includes an upper housing 1 and a valve core assembly 2. The upper housing 1 is a hollow cylinder, as shown... Figure 2 As shown, the upper housing 1 has a valve core mounting hole 1-1 on its side. The valve core mounting hole 1-1 serves as the assembly inlet. Since the valve core assembly 2 inside the upper housing 1 cannot be installed through the narrow pipe interface, the valve core mounting hole 1-1 provides a sufficiently large and direct channel, allowing the entire valve core assembly 2 to be completely and accurately placed into the inner cavity of the upper housing 1. When the valve core assembly 2 requires maintenance or malfunctions, it is not necessary to disassemble the entire valve pipeline. Simply by disassembling other components to provide the valve core mounting hole 1-1, the entire valve core assembly 2 can be pulled out from the side for repair or replacement. This greatly simplifies the maintenance process, reduces maintenance costs and time, and demonstrates the maintainability of the differential pressure replenishment check valve design. The upper housing 1 has a first oil pipe external coupling 1-2 and a second oil pipe external coupling 1-3 at both ends. The valve core assembly 2 is installed at the corresponding position of the valve core mounting hole 1-1. The inner wall of the upper housing 1 is provided with an annular sealing groove, such as... Figure 3As shown, a sealing ring 2-5 is embedded in the annular sealing groove between the upper housing 1 and the valve core assembly 2. The function of the sealing ring 2-5 is to isolate the pressure chamber and form a controllable pressure differential. The sealing ring 2-5 is located on the dynamic mating surface between the valve core assembly 2 and the upper housing 1, clearly separating the valve core assembly 2 and the upper housing 1 into two independent pressure chambers: a high-pressure chamber before the valve and a low-pressure chamber after the valve. The high-pressure chamber before the valve is connected to the anti-corrosion tool, and the low-pressure chamber after the valve is connected to the pump cylinder. Only by isolating these two chambers can an effective and detectable pressure differential be formed when the anti-corrosion tool is blocked, resulting in a decrease in the pressure of the high-pressure chamber before the valve and an increase in the pressure of the low-pressure chamber after the valve. If leakage occurs here, the pressure differential will not be established or will decrease significantly, preventing the threshold for triggering the emergency mode from being reached, and the valve will fail. In addition, the sealing rings 2-5 ensure the "filtration priority" path of the fluid in normal mode. The sealing rings 2-5 are set on the two end faces of the valve core assembly 2 and the upper housing 1, which can force all fluid to enter through the gap between the upper and lower ends of the valve core assembly 2 and flow through the annular gap. This prevents the well fluid from "taking a shortcut" and short-circuiting through the gap to the pump barrel in normal mode. This ensures that under normal operating conditions, all well fluid has been treated by the pre-corrosion and scale prevention tools, thus achieving the fundamental purpose of protecting the oil pump.

[0096] In this embodiment, the first oil pipe external threads 1-2 are internal threads, and the second oil pipe external threads 1-3 are external threads. This configuration provides great connection flexibility for complex piping systems and can serve as a conversion interface between different standard threads.

[0097] like Figure 4 As shown, the valve core assembly 2 includes a valve core body 2-1. One end of the valve core body 2-1 is radially provided with a first through hole 2-6 along the upper housing 1. The valve core body 2-1 is axially provided with a plurality of second through holes 2-7 along the upper housing 1. The end of the second through hole 2-7 away from the first through hole 2-6 passes through the valve core body 2-1. The end of the second through hole 2-7 near the first through hole 2-6 is connected to the first through hole 2-6. A ball seat is provided at the connection between the first through hole 2-6 and the second through hole 2-7.

[0098] like Figure 5 As shown, a baffle 2-4 is provided in the second through hole 2-7. The baffle 2-4 is detachably fixed to the valve core body 2-1 at the end away from the first through hole 2-6.

[0099] like Figure 5 As shown, a spring 2-3 is fixedly connected to one end of the baffle 2-4 near the first through hole 2-6, and a valve ball 2-2 is provided at the other end of the spring 2-3. The valve ball 2-2 matches the ball seat.

[0100] The baffle 2-4 has several through holes or slits for fluid to pass through. The baffle 2-4 is fixed to the valve core body 2-1 near the end of the second through hole 2-7 by a threaded connection.

[0101] The outer periphery of the baffle 2-4 is provided with external threads, and the inner side of the valve core body 2-1 near the end of the second through hole 2-7 is provided with internal threads that cooperate with the external threads of the baffle 2-4.

[0102] Spring 2-3 is a stainless steel compression spring, used to promote a tight fit between valve ball 2-2 and ball seat.

[0103] like Figure 5 As shown, the valve core body 2-1 is a non-circular cylinder, and the valve core body 2-1 has a racetrack-shaped cross-section.

[0104] The sidewall of the valve core body 2-1 is composed of two oppositely arranged arc-shaped contact surfaces with the same radius of curvature, and two oppositely arranged planes. The arc-shaped contact surfaces are used for sliding engagement with the inner wall of the upper housing 1.

[0105] The radius of curvature of the arc-shaped contact surface on the side wall of valve core body 2-1 is equal to the radius of curvature of the semi-circular arc segment of the racetrack-shaped end face of valve core body 2-1.

[0106] Example 11 Using the differential pressure replenishment check valve provided in Example 10, this example provides a working principle based on the aforementioned differential pressure replenishment check valve. During normal operation, filtration is prioritized. After being treated by a pre-installed anti-corrosion tool, the well fluid flows into the differential pressure replenishment check valve. At this time, the pressure difference between the high-pressure chamber before the valve and the low-pressure chamber after the valve is less than 0.1 MPa, and the fluid thrust is approximately 2 N, which is less than the elastic force provided by spring 2-3. The valve ball 2-2 matches the ball seat to achieve a seal, and the fluid flows through the second through hole 2-7 towards the pump barrel. At this time, under the preload of spring 2-3, the valve ball 2-2 is tightly pressed against the valve seat, sealing the first through hole 2-6 and ensuring that the liquid is filtered.

[0107] Emergency Operation Procedure: Clogged anti-corrosion tools caused a drop in the high-pressure chamber upstream of the valve. If the low-pressure chamber downstream of the valve is 0.8 MPa and the high-pressure chamber upstream of the valve is 0.5 MPa, then the pressure difference between the high-pressure chamber upstream of the valve and the low-pressure chamber downstream of the valve is 0.3 MPa. The pressure-bearing area of ​​valve ball 2-2 is 201 mm². 2 The calculated fluid thrust of 60.3 N is greater than the elastic force provided by spring 2-3. This fluid thrust pushes valve ball 2-2 to compress spring 2-3, causing it to move backward and opening the second through-hole 2-7. The well fluid bypasses the blocked corrosion-resistant tool and directly enters the valve ball cavity through the first through-hole 2-6. It then enters the pump cylinder through the central annular gap channel of the upper shell 1. The well fluid flow area is 50 mm². 2 Maintain a displacement of not less than 15m³ 3 / d maintained production, ensured a clear differential pressure threshold for mode switching, and guaranteed a minimum discharge rate in emergency situations. This avoided frequent well workover operations and saved significant production costs.

[0108] Example 12 Using the differential pressure replenishment flow valve provided in Example 10, this example provides a sand-proof, anti-clogging, and long-life design based on the aforementioned differential pressure replenishment flow valve.

[0109] 1. To prevent formation sand or scale from entering the internal moving parts of the valve core body 2-1, specifically between the valve ball 2-2 and the valve seat, and causing valve jamming, this utility model incorporates a special anti-sand and anti-clogging design: At both the inlet and outlet ends of the side hole (i.e., the first through hole 2-6) of the valve core body 2-1, 100-mesh stainless steel filters are detachably installed. The nominal pore size of the stainless steel filter is 0.15mm. In the emergency blockage mode, the well fluid must pass through this double-layer filter before flowing through the first through hole 2-6 into the valve ball cavity. This design effectively blocks solid particles larger than 0.15mm, ensuring that only relatively clean fluid can contact and push the valve ball 2-2, thereby fundamentally avoiding the failure of the emergency function due to sand or scale particles blocking the valve ball 2-2.

[0110] 2. To address the corrosive and abrasive properties of well fluids, this utility model's differential pressure replenishment check valve employs high-performance materials and advanced manufacturing processes to extend maintenance cycles. Both the valve core body 2-1 and the valve ball 2-2 are made of corrosion-resistant ceramic-stainless steel composite material. Specifically, the valve ball 2-2 can be made of integral zirconia ceramic, and the valve core body 2-1 has a base of 316L stainless steel. The key mating surfaces are covered with a ceramic layer through thermal spraying or inlay processes. The mating surfaces of the valve ball 2-2 and the valve seat are ultra-precision ground, with a surface roughness of no more than 0.05 micrometers. This "hard-to-hard" match, combined with perfect sphericity, achieves an extremely high sealing level and an extremely low wear rate.

[0111] The combination of materials and processes described above ensures that the differential feed flow valve can achieve a maintenance-free and stable operating cycle of more than 5 years under normal corrosion and wear conditions, significantly reducing the maintenance costs of oil wells. In emergency mode, the high-pressure well fluid is first filtered through a 100-mesh stainless steel filter. The clean fluid pushes the ultra-precision ground ceramic valve ball 2-2, smoothly compressing the spring 2-3 to open the bypass. The entire operation is smooth and causes minimal wear on critical sealing surfaces, thus reliably achieving multiple emergency responses within its design life.

[0112] Example 13 This embodiment provides an example of the installation, commissioning, and operation of a differential pressure replenishment flow valve.

[0113] 1. Installation and debugging A typical high water-cut, easily scaled oil well was selected as the implementation target. Its basic well conditions were: water cut 85%, and wellbore fluid scaling rate approximately 2.0 mm / year. A differential pressure replenishment check valve was installed 8 meters above the electrochemical corrosion prevention device in the well's tailpipe. To ensure valve reliability, a strict commissioning procedure was performed before running it into the well. The valve core assembly was pre-assembled and tested for differential pressure on a pressure test bench. The downstream pressure was gradually increased. When the differential pressure reached 0.3 MPa, the valve ball 2-2 was observed to open quickly and smoothly. When the differential pressure returned to 0.25 MPa, the valve ball 2-2 automatically reset and closed under the action of the spring 2-3, with sensitive and smooth operation.

[0114] For the sealing test, the fully assembled differential pressure supply check valve is placed on a test bench and a static pressure of 1.5 MPa is applied, which is 1.5 times the normal working pressure, and the pressure is maintained for 30 minutes. The test result is considered qualified if the pressure drop is no greater than 0.05 MPa, ensuring that all threaded connections and sealing parts are safe under downhole pressure.

[0115] Tube string insertion operation: The tubing string assembly sequence from bottom to top is: sucker pump → 100-meter tailpipe → electrochemical corrosion protection device → differential pressure supply check valve → 20-meter tailpipe. During connection, use professional tubing wrenches to tighten the threads to the specified torque of 4000 N·m to ensure the mechanical integrity of the tubing string connection.

[0116] 2. Running effect Normal production phase (0-10 months): During this stage, the check valve operates in normal flow mode, prioritizing filtration. The well fluid is first treated by an electrochemical corrosion inhibitor, and then enters the pump barrel through the annular gap between the valve core assembly 2 and the upper housing 1. Production data shows that the well's average daily fluid production is stable at 3.5 m³ / s. 3 The sand content of the fluid was maintained at a low level of 0.08%. During this period, the pressure in the high-pressure chamber before the valve and the pressure in the low-pressure chamber after the valve were basically balanced, and the pressure difference was far below the trigger threshold of 0.3MPa. Under the preload of the spring 2-3, the valve ball 2-2 always maintained a sealing state against the first through hole 2-6, ensuring the anti-corrosion treatment effect.

[0117] Congestion Emergency Phase (10th Month): By the 10th month, the pre-installed electrochemical corrosion protection device became clogged due to scale buildup. Downhole pressure monitoring showed that the pressure in the high-pressure chamber before the valve dropped to 0.4 MPa, while the pressure in the low-pressure chamber after the valve remained at 0.7 MPa, with the pressure difference reaching and exceeding the set threshold of 0.3 MPa. At this point, the fluid thrust overcame the spring preload, and the differential pressure supply check valve automatically switched to the clog emergency mode within 8 seconds, prioritizing flow. Valve ball 2-2 opened, and the first through-hole 2-6 was open. The well fluid bypassed the clogged corrosion protection device and entered the pump barrel directly through the emergency flow channel formed by the side hole. Despite the reduced flow channel area, the production rate was successfully maintained at 2.3 m³. 3 The valve's operating rate was approximately 70% of normal, effectively preventing well shutdowns. Under these emergency conditions, the valve continued operating until the planned well workover in the 18th month. Upon inspection, only about 0.2mm of soft scale was found on the valve ball surface; after simple cleaning, it functioned perfectly, demonstrating its excellent scale resistance and reliability. The differential pressure replenishment check valve not only successfully extended the well's pump inspection cycle from 12 months to 18 months, but also provided uninterrupted, automated production assurance in the event of blockage, resulting in significant economic benefits.

[0118] 3. To expand the applicability of differential pressure replenishment check valves, for particularly demanding operating conditions, the following can be adopted: High sulfur content conditions: For oil wells with H2S content exceeding 1000ppm, the shell can be made of Inconel 625 nickel-based alloy, and the valve ball 2-2 can be replaced with tungsten carbide. This material combination can improve its resistance to hydrogen sulfide stress corrosion by more than 3 times and extend the applicable temperature range to -20℃ to 150℃.

[0119] High erosion conditions: For wells with extremely high sand content, the valve ball 2-2 and valve seat can be replaced with toughened zirconia ceramic, which significantly improves the resistance to erosion and wear.

[0120] In the chemical industry: It can be adapted to pipelines with diameters of DN50-DN100 and installed on the feed line of the reactor as an anti-clogging safety valve. When the upstream filter is clogged, it can automatically open the bypass to ensure a continuous supply of reactants and prevent production interruptions and safety accidents.

[0121] In wastewater treatment: It can be installed upstream of a fine filtration unit. When sludge or debris clogs the filter, the valve automatically opens, directing the unfiltered liquid into an emergency treatment channel or temporary storage tank, preventing the system from shutting down due to excessive pressure and ensuring the continuous operation of the wastewater treatment system.

[0122] Example 14 To verify the actual effectiveness of this differential pressure replenishment check valve, a two-year field test was conducted on five typical oil wells in Oilfield A. Prior to the test, all five wells experienced short pump inspection cycles and frequent production stoppages due to corrosion and scaling issues. During the test, the differential pressure replenishment check valve with emergency bypass function was installed below the pump and used in conjunction with conventional anti-corrosion tools. The test subjects were five oil wells with an average pump inspection cycle of 12 months. The technical parameters of the differential pressure replenishment check valve were: spring 2-3 10N, trigger differential pressure 0.3MPa, and flow area of ​​the first through-hole 2-6 120mm². 2 The flow area of ​​the second through hole 2-7 is 50mm². 2 The experimental results are as follows: (1) Long-term effectiveness verification: The pump inspection cycle was significantly extended. The average pump inspection cycle of the test wells was extended from 12 months to 18 months, an extension rate of 50%. Under the "normal flow mode," the differential pressure replenishment check valve effectively ensured the function of the pre-installed anti-corrosion and anti-scaling tools, providing continuous and stable protection for the oil pumps and significantly reducing corrosion and scaling. The average number of well workovers per well per year was reduced by 1.2 times / well / year, significantly reducing operating costs and disruption to production.

[0123] (2) Reliability verification: efficient and rapid emergency response During the test, three wells triggered the "blockage emergency mode" due to scale buildup. Monitoring data showed that the response time from the differential pressure reaching the threshold to the full opening of the first through-hole 2-6 and the start of production recovery was less than 8 seconds in all cases. After the first through-hole 2-6 opened, the well production quickly recovered to over 70% of normal operating conditions. This verified the sensitivity of the differential pressure control mechanism of the differential pressure replenishment flow valve and the reliability of its actuating mechanism. The rapid emergency response prevented prolonged production shutdowns caused by blockages, reducing annual production loss per well by more than 90 tons, and ensuring the continuity and stability of crude oil production.

[0124] (3) Economic verification: Outstanding cost-effectiveness Conventional valves reduce well repair frequency and production losses, resulting in annual savings of 120,000 yuan per well in well repair costs and production losses. In contrast, the procurement and installation cost per well for this unit is approximately 20,000 yuan. Based on these figures, the investment payback period for this unit is only 2.5 months, demonstrating extremely significant economic benefits.

[0125] This test fully demonstrates that the differential pressure replenishment single-flow valve with emergency bypass function provided in this application is a downhole anti-corrosion and anti-scaling tool valve that can effectively extend the pump inspection cycle, quickly respond to blockage faults, significantly improve the production rate of oil wells, and generate outstanding economic benefits. It fully achieves the expected purpose of the utility model and provides an efficient and reliable solution to the problems of pump tool blockage and equipment corrosion in oilfield production.

[0126] In summary, this utility model's differential pressure replenishment single-flow valve achieves switching between "normal filtration and emergency bypass," fundamentally avoiding unplanned well shutdowns caused by tool blockage and improving production uptime. Utilizing differential pressure and a mechanical spring as the driving and judgment elements, it has no electronic components, adapts to harsh downhole environments, and offers reliable operation and a long service life. By precisely calculating the spring preload, valve ball bearing area, and flow channel dimensions, it ensures a clear differential pressure threshold for mode switching and guarantees a minimum discharge rate in emergency situations. This avoids frequent well workover operations and saves significant production costs.

[0127] The features of the various embodiments disclosed in this utility model can be combined in part or in whole. As will be clearly understood by those skilled in the art, various technical interactions and operations are possible. Furthermore, various embodiments can be implemented individually or in combination.

[0128] In summarizing the detailed description, those skilled in the art will understand that many variations and modifications can be made to the described embodiments without departing from this disclosure. Therefore, the disclosed embodiments are used in a general and descriptive sense and are not intended to be limiting.

Claims

1. A differential pressure replenishment check valve, characterized in that, The device includes an upper housing (1) and a valve core assembly (2). The upper housing (1) is a hollow cylinder. A valve core mounting hole (1-1) is provided on the side of the upper housing (1). A first oil pipe external buckle (1-2) and a second oil pipe external buckle (1-3) are provided at both ends of the upper housing (1). The valve core assembly (2) is installed at the corresponding position of the valve core mounting hole (1-1). An annular sealing groove is provided on the inner wall of the upper housing (1). A sealing ring (2-5) is embedded in the annular sealing groove between the upper housing (1) and the valve core assembly (2).

2. The differential pressure replenishment check valve according to claim 1, characterized in that, The valve core assembly (2) includes a valve core body (2-1). One end of the valve core body (2-1) is radially provided with a first through hole (2-6) along the upper housing (1). The valve core body (2-1) is axially provided with a plurality of second through holes (2-7) along the upper housing (1). The end of the second through hole (2-7) away from the first through hole (2-6) passes through the valve core body (2-1). The end of the second through hole (2-7) near the first through hole (2-6) is connected to the first through hole (2-6). A ball seat is provided at the connection between the first through hole (2-6) and the second through hole (2-7).

3. The differential pressure replenishment check valve according to claim 2, characterized in that, A baffle (2-4) is provided inside the second through hole (2-7). The baffle (2-4) is detachably fixed to the valve core body (2-1) at the end away from the first through hole (2-6).

4. The differential pressure replenishment check valve according to claim 3, characterized in that, A spring (2-3) is fixed to one end of the baffle (2-4) near the first through hole (2-6), and a valve ball (2-2) is provided at the other end of the spring (2-3), and the valve ball (2-2) matches the ball seat.

5. The differential pressure replenishment check valve according to claim 3, characterized in that, The baffle (2-4) is an annular structure, and the baffle (2-4) has several through holes or gaps for fluid to pass through.

6. The differential pressure replenishment check valve according to claim 3, characterized in that, The baffle (2-4) is fixed to the valve core body (2-1) near the end of the second through hole (2-7) by a threaded connection.

7. The differential pressure replenishment check valve according to claim 6, characterized in that, The baffle (2-4) has an external thread on its outer periphery, and the valve core body (2-1) has an internal thread on its inner side near the end of the second through hole (2-7) that matches the external thread of the baffle (2-4).

8. The differential pressure replenishment check valve according to claim 3, characterized in that, The spring (2-3) is a stainless steel compression spring, used to promote a tight fit between the valve ball (2-2) and the ball seat.

9. The differential pressure replenishment check valve according to claim 1, characterized in that, The valve core body (2-1) is a non-circular cylinder, and the valve core body (2-1) is a cylinder structure with a racetrack-shaped cross-section.

10. The differential pressure replenishment check valve according to claim 9, characterized in that, The sidewall of the valve core body (2-1) is composed of two oppositely arranged arc-shaped contact surfaces with the same radius of curvature and two oppositely arranged planes. The arc-shaped contact surfaces are used to slide with the inner wall of the upper housing (1).

11. The differential pressure replenishment check valve according to claim 10, characterized in that, The radius of curvature of the arc-shaped contact surface of the sidewall of the valve core body (2-1) is equal to the radius of curvature of the semi-circular arc segment of the racetrack-shaped end face of the valve core body (2-1).

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