Back pressure reducing mixed transportation pry suitable for single well and scattered well
By designing a pressure-reducing mixed-transport skid suitable for both single and scattered wells, the problem of high wellhead back pressure was solved, achieving equipment stability and reduced energy consumption, and ensuring production continuity and equipment mobility.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2025-07-18
- Publication Date
- 2026-05-26
AI Technical Summary
Existing technologies are insufficient to effectively reduce wellhead back pressure in remote single wells and scattered well areas, resulting in high energy consumption, low production, and complex equipment structures that are inconvenient to install and transport.
A pressure-return hybrid transport skid suitable for single wells and scattered wells was designed, including a skid base, a single screw pump, inlet and outlet pipe sections, an explosion-proof frequency converter control cabinet and an interlocking protection system. The pump operation is automatically controlled by detecting pipeline pressure and temperature, and it has a bypass function to prevent flow channel blockage in the event of equipment failure.
It achieves equipment stability and mobility, reduces energy consumption, extends equipment lifespan, and ensures production continuity in the event of a failure and unattended operation.
Smart Images
Figure CN224282590U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to oil well mixed transportation equipment, and more particularly to a pressure-reducing mixed transportation skid applicable to single wells and scattered wells. Background Technology
[0002] Most domestic oilfields have entered the late stage of development, and some wells exhibit characteristics such as low fluid volume and low water cut. Especially for single wells or scattered well areas with relatively large well spacing, the distance to metering stations and the length of oil pipelines lead to high wellhead back pressure, resulting in high energy consumption due to the long-term use of electric heaters. The magnitude of back pressure has a significant impact on the operating conditions of oil well production systems. Increased back pressure leads to increased energy consumption and reduced production in mechanical oil production systems. Furthermore, during the venting process of intervention wells, when the residual pressure at the wellhead is lower than the back pressure of the surface pipeline network, well control operations are required, which can easily cause formation contamination. Reducing oil well back pressure is beneficial for reducing energy consumption, increasing oil well production, and extending the oil well's self-flowing cycle.
[0003] Currently, there are technologies available to reduce back pressure in oil wells. Published patents have proposed technologies such as hydraulic jet pumps, hydraulic cylinder boosters, dual-head pumping units, and jet pumps, all of which effectively reduce back pressure at the wellhead. However, due to their complex structures, these technologies are not suitable for production and use in remote single-well or scattered well areas. Utility Model Content
[0004] The technical problem to be solved by this utility model is to provide a simple structure, convenient equipment installation and transportation, and energy-saving pulley for single wells and scattered wells, which addresses the shortcomings of the existing technology.
[0005] The technical solution adopted by this utility model to solve the above-mentioned problems is as follows: a pressure-return mixing skid applicable to single wells and scattered wells, characterized in that: it includes a skid base, a single screw pump installed on the skid base, an inlet pipe section connected to the inlet end of the single screw pump, an outlet pipe section connected to the outlet end of the single screw pump, and an explosion-proof variable frequency control cabinet electrically connected to the single screw pump. An inlet pipe section control valve group and a filter are provided on the inlet pipe section, and an outlet pipe section control valve group and a filter are provided on the outlet pipe section. An inlet and outlet interlock protection system is also provided on the inlet and outlet pipe sections for detecting the pressure inside the pipeline at the inlet and outlet ends of the single screw pump and the stator temperature of the single screw pump.
[0006] According to the above technical solution, the outlet pipe section is connected to the inlet pipe section through a bypass pipe, and a bypass pipe control valve group is provided on the bypass pipe.
[0007] According to the above technical solution, a first flat gate valve and a first filter are sequentially arranged near the inlet end of the inlet pipe section, and a first check valve, a second flat gate valve and a second filter are sequentially arranged near the outlet end of the outlet pipe section.
[0008] According to the above technical solution, the inlet and outlet interlock protection system includes a first pressure gauge, a first pressure transmitter, a second pressure gauge, and a second pressure transmitter respectively configured on the front and rear pipe sections of the first basket filter; a third pressure gauge and a third pressure transmitter configured on the second filter near the outlet end of the single screw pump; and a stator temperature transmitter configured on the upper end of the booster section of the single screw pump near the outlet side for detecting the stator temperature of the single screw pump.
[0009] According to the above technical solution, both the first filter and the second filter are basket filters.
[0010] According to the above technical solution, the bottoms of the first and second filters are respectively connected to sewage pipes; sewage valves are respectively installed on the sewage pipes near the equipment end.
[0011] According to the above technical solution, the motor of the single screw pump is connected to the explosion-proof frequency converter control cabinet through the motor power supply line; the first and second pressure transmitters of the inlet pipe section, the third pressure transmitter of the outlet pipe section, and the stator temperature transmitter on the upper side of the pump body are connected to the explosion-proof frequency converter control cabinet through the control signal line.
[0012] According to the above technical solution, the single screw pump includes an electric motor and a bearing. The bottom of the bearing is mounted on a skid via a bearing housing. The power output end of the electric motor is connected to the power input end of the pump body via a coupling.
[0013] According to the above technical solution, the outlet end of the single screw pump is also connected to a venting pipeline, the outlet of the venting pipeline is connected to the inlet end of the single screw pump, and a control valve is provided on the venting pipeline.
[0014] According to the above technical solution, the bypass pipeline control valve group includes a third flat gate valve and a second check valve connected to the outlet end of the third flat gate valve.
[0015] The beneficial effects of this utility model are as follows:
[0016] 1. This utility model has a compact and ingenious structure, which facilitates the installation and transportation of the equipment, increases its stability and mobility, and ensures convenient disassembly and assembly. Through the inlet and outlet interlock protection system, it detects the pressure inside the pipeline at the inlet and outlet of the single screw pump, as well as the stator temperature of the single screw pump. Based on the production pressure of the oil production system, it sets low pressure alarm and low-low pressure shutdown settings at the pipeline inlet, high pressure alarm and high-high pressure shutdown settings at the pipeline outlet, and high temperature alarm and high-high temperature shutdown settings at the pump stator temperature. When the pressure or temperature exceeds the set value, it sends a signal to the control cabinet to shut down the power supply to the single screw pump. This enables unattended operation while reducing wear and tear on the single screw pump and extending the service life of the equipment.
[0017] 2. This utility model connects a bypass pipeline with a control valve assembly to the inlet and outlet pipes of the single screw pump. When the single screw pump stops for any reason, the produced liquid flows out through the bypass pipeline, thereby avoiding blockage of the produced liquid flow channel when the single screw pump stops. It also allows for timely repair of the faulty single screw pump without affecting production, increasing the stability and safety of the skid-mounted equipment.
[0018] 3. This utility model has the function of synchronously starting or stopping work according to whether the oil production system is in normal production, and also has the function of oil well produced fluid flowing out from the bypass pipe when it is damaged. Attached Figure Description
[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0020] Figure 1 This invention provides a downpressure mixed transport skid applicable to single wells and scattered wells.
[0021] Figure 2 This is a schematic diagram of the mixed-transport skid inlet pipe section and single screw pump provided in the embodiments of this utility model.
[0022] Figure 3 This is a schematic diagram of the process instrument automatic control flow in the embodiment of this utility model. Detailed Implementation
[0023] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0024] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this application is in use. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.
[0025] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.
[0026] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.
[0027] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0028] Example 1:
[0029] like Figure 1-3As shown, this embodiment provides a pressure-return mixed transport skid applicable to single wells and scattered wells, including a skid base 0, a single screw pump 1 installed on the skid base 0, an inlet pipe section 3 connected to the inlet end of the single screw pump, an outlet pipe section 20 connected to the outlet end of the single screw pump, and an explosion-proof variable frequency control cabinet 32 electrically connected to the single screw pump. An inlet pipe section control valve group and a filter are provided on the inlet pipe section 3, and an outlet pipe section control valve group and a filter are provided on the outlet pipe section 20.
[0030] Preferably, the skid 0 is installed on the ground; the single screw pump 1 includes a bearing 12 and a motor 10. The bottom of the bearing 12 is installed on the skid 0 through a bearing seat 12-1. The power output end of the motor 10 is connected to the power input end of the pump body through a bell coupling 11, and the axes of the two are horizontal. The inlet end of the single screw pump 1 is connected to the inlet pipe section 3 through a flange; the inlet pipe section 3 is connected to an external inlet pipe through an inlet flange 2; the outlet end of the single screw pump 1 is connected to the outlet pipe section 20, and the outlet pipe section 20 is connected to an external outlet pipe through an outlet flange 25.
[0031] Preferably, the explosion-proof frequency converter control cabinet 32 is connected to the single screw pump 2 via a motor power supply line and a control signal line, and is installed on a skid mount 0.
[0032] Preferably, a first flat gate valve 4 and a first basket filter 7 are sequentially arranged near the inlet end of the inlet pipe section 3, both connected to the inlet pipe section 3 via flanges. The inlet pipe section 3 is connected to the inlet section of the single screw pump 1 via flanges. A first check valve 24, a second flat gate valve 23, and a second basket filter 22 are sequentially arranged near the outlet end of the outlet pipe section 20, both connected to the outlet pipe section via flanges. The outlet pipe section 20 is connected to the outlet end of the single screw pump 1 via flanges.
[0033] In this embodiment, an inlet and outlet interlock protection system is also provided on the inlet and outlet pipe sections to detect the pressure inside the pipes at the inlet and outlet ends of the single screw pump and the stator temperature of the single screw pump. The inlet and outlet interlock protection system includes a first pressure gauge 6 and a first pressure transmitter 5, a second pressure gauge 8 and a second pressure transmitter respectively configured on the pipe sections before and after the first basket filter 7, for monitoring the pressure difference before and after the first basket filter 7 in order to clean the basket filter; and a third pressure gauge 21 and a third pressure transmitter 19 are provided on the second basket filter 22 near the outlet end of the single screw pump 1 to detect the internal pressure of the outlet pipe section 20; and a stator temperature transmitter 16 is configured on the upper end of the single screw pump booster section 15 near the outlet side to detect the stator temperature of the single screw pump.
[0034] Preferably, the outlet pipe of the single screw pump 2 is sealed and connected to the venting line 17; a safety valve 18 is installed on the venting line 17, and the outlet of the venting line 17 is connected to the inlet section 14 of the single screw pump.
[0035] Preferably, the bottom of the single screw pump 2, the first basket filter 7, and the second basket filter 22 are respectively connected to a sewage discharge pipe 29; a sewage discharge valve 31 is respectively installed near the equipment end of the sewage discharge pipe 29.
[0036] Preferably, the motor 3 is connected to the explosion-proof frequency converter control cabinet via a motor power supply line; the first pressure transmitter 5 and the second pressure transmitter 9 of the inlet pipe section 2, the third pressure transmitter 19 of the outlet pipe section 20, and the stator temperature transmitter 16 on the upper side of the pump body are connected to the explosion-proof frequency converter control cabinet via control signal lines. By detecting the pressure and stator temperature in the inlet and outlet pipes of the single screw pump 2, a signal to shut off the power supply to the single screw pump is sent to the control cabinet when the pressure or temperature exceeds the set value, thereby improving the automation level of the equipment.
[0037] Preferably, the pry bar 0 is a steel structure, and the steel structure is a single plate type.
[0038] The working process of this utility model is as follows: In use, it is connected to the external inlet pipeline through the inlet flange 2 and to the external outlet pipeline through the outlet flange 25. During operation, the oil well produced fluid enters the single screw pump inlet section 14 through the inlet pipe section 3, the first flat gate valve 4 and the first basket filter 7, and then enters the single screw pump pressurization section 15. After the oil well medium is pressurized, it flows out through the outlet pipe section 20 and the external outlet pipeline. The pressure in the inlet and outlet pipes of the single screw pump 2 and the stator temperature are detected by the inlet and outlet pressure interlock protection. When the pressure or temperature exceeds the set value, a signal to shut off the power supply of the single screw pump is sent to the control cabinet.
[0039] This utility model integrates the process flow design, including necessary processes such as inlet and outlet filters, bypass, and outlet safety valve protection. The structure is compact and flexible, facilitating equipment installation and transportation, increasing equipment stability and mobility, and ensuring easy disassembly and assembly. It is optimized with a single screw pump and operating parameters, and its application scope covers single wells and scattered well areas.
[0040] This invention utilizes an inlet and outlet interlock protection system to detect the pressure inside the pipelines at the inlet and outlet of the single screw pump, as well as the stator temperature of the single screw pump. Based on the production pressure of the oil production system, it sets alarm and shutdown values for low pressure at the pipeline inlet, high pressure and shutdown values for high pressure at the pipeline outlet, and high temperature alarm and shutdown values for the pump stator temperature. When the pressure or temperature exceeds the set value, it sends a signal to the control cabinet to shut off the power supply to the single screw pump. This enables unattended operation while reducing wear and tear on the single screw pump and extending the equipment's service life.
[0041] Example 2:
[0042] Example 2 is basically the same as Example 1, except that: the outlet pipe section 20 is connected to the inlet pipe section 3 through the bypass pipe 26; a third flat gate valve 28 is configured on the bypass pipe 26, and the outlet end of the third flat gate valve 28 is connected to the inlet of the second check valve 27 through a flange. When the single screw pump stops for any reason, the produced liquid flows out through the bypass pipe, thereby avoiding blockage of the produced liquid flow channel when the single screw pump stops; it can also be used to repair the faulty single screw pump in a timely manner without affecting production, thereby increasing the stability and safety of the skid-mounted equipment.
[0043] The embodiments described above are some, but not all, of the embodiments of this application. The detailed description of the embodiments of this application is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
Claims
1. A pressure-return mixing skid suitable for single wells and scattered wells, characterized in that: The system includes a skid mount, a single screw pump mounted on the skid mount, an inlet pipe section connected to the inlet end of the single screw pump, an outlet pipe section connected to the outlet end of the single screw pump, and an explosion-proof variable frequency control cabinet electrically connected to the single screw pump. The inlet pipe section is equipped with an inlet pipe section control valve group and a filter, and the outlet pipe section is equipped with an outlet pipe section control valve group and a filter. The inlet and outlet pipe sections are also equipped with an inlet and outlet interlock protection system for detecting the pressure inside the pipes at the inlet and outlet ends of the single screw pump and the stator temperature of the single screw pump.
2. The downpressure mixing skid applicable to single wells and scattered wells according to claim 1, characterized in that: The outlet pipe section is connected to the inlet pipe section through a bypass pipe, and a bypass pipe control valve group is installed on the bypass pipe.
3. The downpressure mixing skid applicable to single wells and scattered wells according to claim 1 or 2, characterized in that: The inlet pipe section is equipped with a first flat gate valve and a first filter in sequence near the inlet end, and the outlet pipe section is equipped with a first check valve, a second flat gate valve and a second filter in sequence near the outlet end.
4. The downpressure mixing skid applicable to single wells and scattered wells according to claim 3, characterized in that: The inlet and outlet interlock protection system includes a first pressure gauge, a first pressure transmitter, a second pressure gauge, and a second pressure transmitter respectively configured on the pipe sections before and after the first filter; a third pressure gauge and a third pressure transmitter configured on the second filter near the outlet end of the single screw pump; and a stator temperature transmitter configured on the upper end of the booster section of the single screw pump near the outlet side for detecting the stator temperature of the single screw pump.
5. The downpressure mixing skid applicable to single wells and scattered wells according to claim 3, characterized in that: Both the first filter and the second filter are basket filters.
6. The downpressure mixing skid applicable to single wells and scattered wells according to claim 3, characterized in that: The bottoms of the first and second filters are respectively connected to sewage pipes; sewage valves are respectively installed on the sewage pipes near the equipment end.
7. The downcomer-pressure mixing skid applicable to single wells and scattered wells according to claim 5, characterized in that: The motor of the single screw pump is connected to the explosion-proof frequency converter control cabinet via a motor power supply line; the first and second pressure transmitters of the inlet pipe section, the third pressure transmitter of the outlet pipe section, and the stator temperature transmitter on the upper side of the pump body are connected to the explosion-proof frequency converter control cabinet via control signal lines.
8. The downpressure mixing skid applicable to single wells and scattered wells according to claim 1 or 2, characterized in that: The single screw pump includes an electric motor and a bearing. The bottom of the bearing is mounted on a skid via a bearing housing. The power output end of the electric motor is connected to the power input end of the pump body via a coupling.
9. The downpressure mixing skid applicable to single wells and scattered wells according to claim 1 or 2, characterized in that: The outlet end of the single screw pump is also connected to a venting pipeline, the outlet of which is connected to the inlet end of the single screw pump, and a control valve is provided on the venting pipeline.
10. The downpressure mixing skid applicable to single wells and scattered wells according to claim 2, characterized in that: The bypass pipeline control valve group includes a third flat gate valve and a second check valve connected to the outlet end of the third flat gate valve.