A digital multi-functional dedicated wellhead water mixing system

Abstract

This invention discloses a digital, multifunctional, dedicated wellhead water injection system, comprising: a water injection pipeline; one end of the water injection pipeline is connected to a return oil pipeline, and the other end is connected to a metering chamber; a flow regulating mechanism is installed on the water injection pipeline; a filter mechanism is installed inside the water injection pipeline to filter impurities in the fluid; a temperature detection unit is connected to both the return oil pipeline and the water injection pipeline, and is used to detect a first real-time temperature value of the fluid in the return oil pipeline and a second real-time temperature value of the fluid in the water injection pipeline; a leakage detection unit is installed on the water injection pipeline to detect whether leakage has occurred; the flow regulating mechanism, the temperature detection unit, and the leakage detection unit are all connected to a controller. This system addresses the problem of freezing and blockage in return oil pipelines caused by factors such as bottom hole pressure, accumulation of impurities in the water injection, system pump reversal, and untimely water injection volume control during previous water injection and heating processes.

Description

Technical Field

[0001] This invention relates to the field of oil production technology, specifically a digital, multi-functional, dedicated wellhead water injection system. Background Technology

[0002] Currently, in oilfield production, the water-mixing and heating process in production wells is particularly important in cold regions. Because crude oil will condense when the ambient temperature drops to its freezing point, leading to pipeline blockage, cold regions often employ a dual-pipeline system. The water-mixing and heating process involves mixing hot water into the oil pipeline, which then enters the gathering pipeline along with the crude oil to prevent condensation. The process involves a transfer station supplying pressure and hot water to individual wells, which must adjust the water mixing volume according to their specific circumstances to ensure the stability of the overall system pressure while preventing crude oil condensation. However, in actual production, pressure and water volume can fluctuate due to factors such as bottom hole pressure, scale buildup in the mixed water, and system pump switching. During nighttime operation, with fewer personnel on duty, the water mixing volume adjustment for individual wells may not be timely. In winter, crude oil and mixed water are prone to condensation and freezing, blocking pipelines. With the increasing adoption of digital equipment in oilfields, untimely water mixing adjustments can also cause digital instruments to freeze and transmit inaccurate data, causing inconvenience to oilfield production. Summary of the Invention

[0003] In view of this, the present invention provides a digital multifunctional dedicated wellhead water injection system to solve the problem that the return oil and water injection pipelines are prone to freezing and blockage due to reasons such as bottom hole pressure, accumulation of impurities in the water injection, system pump reversal, and untimely control of water injection volume when water injection and heat tracing are carried out on the return oil pipeline.

[0004] This invention provides a digital multifunctional dedicated wellhead water injection system, comprising: a water injection pipeline, a flow regulation mechanism, a filtration mechanism, a temperature detection unit, a leakage detection unit, and a controller;

[0005] One end of the water mixing pipeline is connected to the oil return pipeline, and the other end is connected to the metering room;

[0006] The flow regulation mechanism is installed on the water mixing pipeline;

[0007] The filter mechanism is installed inside the water mixing pipeline, and the filter mechanism is used to filter impurities in the fluid in the water mixing pipeline;

[0008] The temperature detection unit is connected to the inside of the oil return pipeline and the water mixing pipeline respectively. The temperature detection unit is used to detect the first real-time temperature value of the fluid in the oil return pipeline and the second real-time temperature value of the fluid in the water mixing pipeline.

[0009] A leakage detection unit is installed on the water mixing pipeline, and the leakage detection unit is used to detect whether the water mixing pipeline is leaking.

[0010] The flow regulation mechanism, the temperature detection unit, and the leakage detection unit are respectively connected to the controller. The controller is used to control the flow regulation mechanism to start and regulate the flow rate of the fluid entering the return oil pipeline from the water mixing pipeline according to the first real-time temperature value and the second real-time temperature value detected by the temperature detection unit, so that the first real-time temperature value is greater than the first predetermined temperature.

[0011] Preferably, the flow regulating mechanism includes: an electric actuator and a valve;

[0012] The valve is installed inside the water mixing pipeline at one end near the oil return pipeline;

[0013] The electric actuator is installed on the water mixing pipeline and is connected to the valve;

[0014] The controller is connected to the electric actuator. When it is necessary to adjust the flow rate of the fluid entering the return oil pipeline from the water mixing pipeline, the controller controls the electric actuator to start and adjust the opening of the valve.

[0015] Preferably, the filtration mechanism includes: a cylindrical filter screen;

[0016] The bottom of the water mixing pipeline is provided with a filter screen mounting groove, and the inner side wall of the filter screen mounting groove has a certain inclination angle with the axis of the water mixing pipeline.

[0017] A protrusion is provided on the top inner wall of the water mixing pipeline corresponding to the position of the filter screen mounting groove;

[0018] The bottom end of the cylindrical filter screen is inserted into the filter screen mounting groove, and the side wall of the cylindrical filter screen away from the water inflow direction contacts the side wall of the protrusion.

[0019] Preferably, the temperature detection unit includes: a first temperature sensor and a second temperature sensor;

[0020] The first temperature sensor is installed in the water mixing pipeline;

[0021] The second temperature sensor is installed in the oil return line;

[0022] The first temperature sensor and the second temperature sensor are respectively connected to the controller.

[0023] Preferably, the leakage detection unit includes: a pressure sensor;

[0024] The pressure sensor is internally connected to the water mixing pipeline.

[0025] The pressure sensor is connected to the controller. The pressure sensor is used to detect the real-time pressure value inside the water mixing pipeline and transmit it to the controller. The controller is used to determine whether the real-time pressure value has dropped by a predetermined pressure value within a second predetermined time. If so, leakage has occurred in the water mixing pipeline.

[0026] Preferably, it further includes: an alarm unit;

[0027] The controller is connected to the alarm unit. When the controller determines that a leak has occurred in the water mixing pipeline, the controller controls the alarm unit to activate the alarm.

[0028] Preferably, it further includes: a one-way control valve;

[0029] The one-way control valve is installed at one end of the water mixing pipeline near the oil return pipeline. The one-way control valve is used to prevent fluid in the oil return pipeline from entering the water mixing pipeline.

[0030] Preferably, it further includes: a rinsing mechanism;

[0031] The flushing mechanism includes: a piston short circuit, a pressure piston, a locking cap, and a flushing connecting rod;

[0032] The bottom end of the piston short is connected to the water mixing pipeline via a base. The piston short has a first chamber and a second chamber inside. The first chamber is located above the second chamber, and the inner diameter of the first chamber is smaller than the inner diameter of the second chamber.

[0033] The pressure piston is located inside the piston short circuit. The pressure piston includes a first piston member and a second piston member. The bottom end of the first piston member is connected to the top end of the second piston member. The diameter of the first piston member matches the inner diameter of the first chamber, and the diameter of the second piston member is larger than the inner diameter of the first chamber.

[0034] The first piston has a first flow channel inside and a liquid inlet hole on its side wall, and the liquid inlet hole is in communication with the first flow channel.

[0035] The locking gland has an internal thread, and the piston short circuit has an external thread that matches the internal thread;

[0036] The top end of the flushing connecting rod passes through the top end of the locking cover. The side wall of the flushing connecting rod inside the locking cover has an annular protrusion. The bottom end of the flushing connecting rod is inside the locking cover. The interior of the flushing connecting rod has a second flow channel.

[0037] The present invention has the following beneficial effects:

[0038] This invention provides a digital multifunctional dedicated wellhead water mixing system. By setting up flow regulation mechanisms, filtration mechanisms, temperature detection units, and leakage detection units on the return oil pipeline and the water mixing pipeline, it solves the problems of pipeline freezing and blockage caused by untimely adjustment of water mixing volume in the water mixing and heating process, as well as the accumulation of scale in the water mixing water. This greatly reduces the labor intensity of employees and saves costs. Attached Figure Description

[0039] The above and other objects, features and advantages of the present invention will become clearer from the following description of embodiments of the invention with reference to the accompanying drawings, in which:

[0040] Figure 1 This is a schematic diagram of the structure of a digital multifunctional special wellhead water mixing system according to an embodiment of the present invention;

[0041] Figure 2 This is a schematic diagram of the rinsing mechanism in an embodiment of the present invention.

[0042] In the diagram, 1-water mixing pipeline, 2-electric actuator, 3-valve, 4-cylindrical filter screen, 5-protrusion, 6-pressure sensor, 7-one-way control valve, 8-sealing cover, 9-piston short circuit, 10-first piston component, 11-second piston component, 12-locking gland, 13-flushing connecting rod, 14-second chamber, 15-first flow channel, 16-second flow channel, 17-annular convex edge, 18-liquid outlet, 19-first annular sealing ring, 20-second annular sealing ring, 21-liquid inlet, 22-base. Implementation

[0043] The present invention will now be described based on embodiments, but it is worth noting that the present invention is not limited to these embodiments. In the following detailed description of the invention, certain specific details are described in detail. However, those skilled in the art will fully understand the invention for the parts not described in detail.

[0044] Furthermore, those skilled in the art should understand that the accompanying drawings are provided only to illustrate the purpose, features, and advantages of the present invention, and are not actually drawn to scale.

[0045] Furthermore, unless the context explicitly requires it, the words "comprising," "including," and similar terms throughout the specification and claims should be interpreted as including rather than exclusive or exhaustive; that is, meaning "including but not limited to."

[0046] Figure 1 This is a schematic diagram of the structure of a digital multifunctional special wellhead water mixing system according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the rinsing mechanism in an embodiment of the present invention. Figure 1 , 2 As shown, a digital multifunctional dedicated wellhead water injection system includes: a water injection pipeline 1, a flow regulation mechanism, a filtration mechanism, a temperature detection unit, a leakage detection unit, and a controller; one end of the water injection pipeline 1 is connected to a return oil pipeline, and the other end is connected to a metering chamber; the flow regulation mechanism is installed on the water injection pipeline 1; the filtration mechanism is installed inside the water injection pipeline 1, and the filtration mechanism is used to filter impurities in the fluid in the water injection pipeline 1; the temperature detection unit is connected to both the return oil pipeline and the interior of the water injection pipeline 1, and the temperature detection unit is used to detect the temperature of the fluid in the return oil pipeline. The first real-time temperature value and the second real-time temperature value of the fluid in the water mixing pipeline 1; a leakage detection unit is installed on the water mixing pipeline 1, and the leakage detection unit is used to detect whether leakage has occurred in the water mixing pipeline 1; the flow regulation mechanism, the temperature detection unit and the leakage detection unit are respectively connected to the controller, and the controller is used to control the flow regulation mechanism to start adjusting the flow rate of the fluid entering the return oil pipeline from the water mixing pipeline 1 according to the first real-time temperature value and the second real-time temperature value detected by the temperature detection unit, so that the first real-time temperature value is greater than the first predetermined temperature.

[0047] In this embodiment of the invention, the controller uses a temperature detection unit to detect the first real-time temperature value of the fluid in the return oil pipeline and the second real-time temperature value of the fluid in the water mixing pipeline 1. The controller determines whether the first real-time temperature value is below a first predetermined temperature, that is, whether the real-time temperature of the crude oil in the return oil pipeline is lower than the first predetermined temperature. If so, it indicates that the temperature of the crude oil in the return oil pipeline is too low and condensation may occur. Then, the controller determines whether the second real-time temperature value is within a second predetermined temperature range. If so, it indicates that the temperature of the water in the water mixing pipeline 1 has reached the temperature that can be mixed into the oil pipeline. Then, the controller controls the flow regulation mechanism to start, mixing the water in the water mixing pipeline 1 into the return oil pipeline.

[0048] After the flow regulation mechanism is activated, the controller starts timing and determines whether the first real-time temperature of the fluid in the return oil pipeline reaches or exceeds the first predetermined temperature within a first predetermined time. If not, it indicates that the water flow rate in the return oil pipeline is too low, and the crude oil temperature cannot rise above the first predetermined temperature, requiring water flow adjustment. The controller then controls the flow regulation mechanism to adjust the flow rate of the fluid in the return oil pipeline, increasing the water flow rate from water mixing line 1 into the return oil pipeline to the predetermined flow rate. After adjustment, the controller starts timing again and determines whether the first real-time temperature of the fluid in the return oil pipeline reaches or exceeds the first predetermined temperature within a first predetermined time. If not, the controller again controls the flow regulation mechanism to increase the water flow rate from water mixing line 1 into the return oil pipeline until the first real-time temperature of the fluid in the return oil pipeline reaches or exceeds the first predetermined temperature. The first predetermined temperature is 28℃, the second predetermined temperature range is 35-38℃, and the first predetermined time is 1 minute.

[0049] While water is being added, the controller activates the leakage detection unit to monitor leakage in the water addition pipeline 1 in real time.

[0050] In this invention, the flow regulation mechanism includes an electric actuator 2 and a valve 3; the valve 3 is installed in the water mixing pipeline 1 at one end near the return oil pipeline; the electric actuator 2 is installed on the water mixing pipeline 1 and is connected to the valve 3; the controller is connected to the electric actuator 2, and when it is necessary to regulate the flow rate of the fluid entering the return oil pipeline from the water mixing pipeline 1, the controller controls the electric actuator 2 to start and adjust the opening degree of the valve 3.

[0051] In this embodiment of the invention, valve 3 is installed inside the water mixing pipeline 1. When the controller detects through the temperature detection unit that the first real-time temperature of the crude oil in the return oil pipeline is lower than the first predetermined temperature, the controller controls the electric actuator 2 to start, and the electric actuator 2 controls the valve 3 to open, allowing water from the water mixing pipeline 1 to enter the return oil pipeline. Initially, the opening of valve 3 can be controlled at 10%. The controller determines whether the first real-time temperature of the crude oil in the return oil pipeline rises above the first predetermined temperature within a first predetermined time. If not, the controller controls the opening of valve 3 to increase by a predetermined percentage through the electric actuator 2. For example, if the predetermined percentage is 10%, then the electric actuator 2 needs to adjust the opening of valve 3 to 20%. The controller again determines whether the first real-time temperature in the return oil pipeline reaches above the first predetermined temperature within the first predetermined time. If not, the controller continues to increase the opening of valve 3 by 10%, and so on, until the temperature of the crude oil in the return oil pipeline reaches above the first predetermined temperature. Then, the currently adjusted opening of valve 3 remains unchanged, and water is continuously mixed into the return oil pipeline.

[0052] The controller continuously judges the crude oil temperature value and then controls the electric actuator 2 to gradually increase the opening of valve 3, thereby gradually increasing the water mixing flow rate, ensuring that the crude oil temperature can reach the requirements, preventing crude oil from condensing, and at the same time avoiding the excessive water mixing caused by opening valve 3 all at once, which would increase production costs.

[0053] In this invention, the filtration mechanism includes: a cylindrical filter screen 4; a filter screen mounting groove is provided at the bottom of the water mixing pipeline 1, and the inner side wall of the filter screen mounting groove has a certain inclination angle with the axis of the water mixing pipeline 1; a protrusion 5 is provided on the top inner wall of the water mixing pipeline 1 corresponding to the position of the filter screen mounting groove; the bottom end of the cylindrical filter screen 4 is inserted into the filter screen mounting groove, and the side wall of the cylindrical filter screen 4 away from the direction of incoming water contacts the side wall of the protrusion 5.

[0054] In this embodiment of the invention, the filter screen mounting groove is the interior of a section of inclined pipe protruding below the water mixing pipeline 1. The inner wall of the filter screen mounting groove is inclined towards the return oil pipeline, and the position of the filter screen mounting groove within the water mixing pipeline 1 is on the side of the valve 3 away from the return oil pipeline. When the bottom end of the cylindrical filter screen 4 is inserted into the filter screen mounting groove, the cylindrical filter screen 4 is also in an inclined state, and the top end of the cylindrical filter screen 4 is close to the top of the water mixing pipeline 1.

[0055] There is a protrusion 5 on the top side wall of the water mixing pipeline 1 between the cylindrical filter screen 4 and the valve 3. The protrusion 5 is an inverted triangle, and the side of the protrusion 5 away from the valve 3 is in contact with the side wall of the cylindrical filter screen 4.

[0056] When water enters the metering room, the water flows in the mixing pipeline 1 toward the valve 3; when it reaches the cylindrical filter screen 4, it passes through the cylindrical filter screen 4, and the impurities in the water are filtered by the cylindrical filter screen 4, thereby preventing the valve 3 and the mixing pipeline 1 from being blocked by impurities.

[0057] The bottom of the filter screen mounting slot is open, and the opening is sealed by the sealing cap 8. When the cylindrical filter screen 4 is used for filtration, impurities in the water will settle into the filter screen mounting slot after a certain period of time. When regular cleaning is required, the sealing cap 8 can be opened, and the cylindrical filter screen 4 can be removed for replacement or cleaning.

[0058] The filter screen mounting groove serves to fix the cylindrical filter screen 4 and facilitates its removal and installation, as well as cleaning. Its tilt angle ensures the filter screen 4 remains tilted within the water mixing pipeline 1, increasing the filtration contact area and achieving better filtration. The protrusion 5 on the inner wall of the water mixing pipeline 1 holds the side of the cylindrical filter screen 4 away from the incoming water, preventing excessive water pressure from pushing it out of the mounting groove.

[0059] In this invention, the temperature detection unit includes a first temperature sensor and a second temperature sensor; the first temperature sensor is installed in the water mixing pipeline 1; the second temperature sensor is installed in the oil return pipeline; the first temperature sensor and the second temperature sensor are respectively connected to the controller.

[0060] In this embodiment of the invention, when crude oil is transported in the return pipeline, the controller activates the first temperature sensor to detect the first real-time temperature of the crude oil in the return pipeline and transmits it to the controller. The controller determines whether the first real-time temperature is less than the first predetermined temperature, i.e., 28°C. If so, the controller activates the second temperature sensor to detect the second real-time temperature value in the water mixing pipeline 1 and transmits it to the controller. The controller determines whether the second real-time temperature value is within the second predetermined temperature range, i.e., 35-38°C. If so, the controller controls the valve 3 to open to an initial opening degree of 10% through the electric actuator 2. The controller starts timing and determines whether the first real-time temperature value of the crude oil detected by the first temperature sensor rises above 28°C within the first predetermined time after the valve 3 is opened, i.e., 1 minute. If not, the controller controls the valve 3 opening degree to increase by 10%, the controller restarts timing, and determines whether the first real-time temperature reaches above 28°C within 1 minute. If still not, the valve 3 opening degree is increased further. Timing restarts each time the valve 3 opening degree is increased until the crude oil temperature in the return pipeline reaches the required level.

[0061] In this invention, the leakage detection unit includes: a pressure sensor 6; the pressure sensor 6 is connected inside the water mixing pipeline 1; the pressure sensor 6 is connected to the controller, the pressure sensor 6 is used to detect the real-time pressure value inside the water mixing pipeline 1 and transmit it to the controller, the controller is used to determine whether the real-time pressure value has decreased by a predetermined pressure value within a second predetermined time, if so, leakage has occurred in the water mixing pipeline 1.

[0062] In this embodiment of the invention, pressure sensor 6 is installed on the water mixing pipeline 1 between valve 3 and the return oil pipeline. During water mixing, the controller activates pressure sensor 6 to detect the real-time pressure value in the water mixing pipeline 1 and transmit it to the controller. Under normal conditions, the pressure in the water mixing pipeline 1 remains stable for a long time. If leakage occurs, the pressure will suddenly drop within a short period. By setting pressure sensor 6 to detect when the real-time pressure value in the water mixing pipeline 1 drops beyond a predetermined pressure value within a second predetermined time (e.g., 30 seconds), it indicates leakage in the water mixing pipeline 1, and water mixing must be stopped immediately. The predetermined pressure value is 0.1 MPa.

[0063] In this invention, an alarm unit is also included; the controller is connected to the alarm unit, and when the controller determines that leakage has occurred in the water mixing pipeline 1, the controller controls the alarm unit to start an alarm.

[0064] In this embodiment of the invention, the alarm unit can be an audible and visual alarm. When the controller detects a leak in the water mixing pipeline 1 through the pressure sensor 6, the controller will activate the alarm to remind the operator to shut off the water supply to the metering room in time to prevent further leakage.

[0065] In this invention, a one-way control valve 7 is also included; the one-way control valve 7 is installed at one end of the water mixing pipeline 1 near the oil return pipeline, and the one-way control valve 7 is used to prevent fluid in the oil return pipeline from entering the interior of the water mixing pipeline 1.

[0066] In this embodiment of the invention, a one-way control valve 7 is installed inside the water injection pipeline 1 between the pressure sensor 6 and the return oil pipeline. Under normal water injection conditions, the fluid pressure inside the water injection pipeline 1 is greater than the fluid pressure inside the return oil pipeline. However, when the fluid pressure inside the water injection pipeline 1 is lower than the fluid pressure inside the return oil pipeline or the wellhead pressure, the well fluid is prone to backflow into the water injection pipeline 1, causing blockage. By setting the one-way control valve 7, the backflow of well fluid into the water injection pipeline 1 can be prevented. When the wellhead pressure or return oil pressure is higher than the water injection pressure, the well fluid backflows to the one-way control valve 7. At this time, the sealing baffle in the one-way control valve 7 is activated under the action of the pressure difference, sealing one end of the water injection pipeline 1 and preventing the well fluid from flowing back into the water injection pipeline 1.

[0067] In this invention, a flushing mechanism is also included; the flushing mechanism includes a piston short connector 9, a pressure piston, a locking cap 12, and a flushing connecting rod 13; the bottom end of the piston short connector 9 is connected to the water mixing pipeline 1 via a base 22, and the piston short connector 9 has a first chamber and a second chamber 14 inside, the first chamber being above the second chamber 14, and the inner diameter of the first chamber being smaller than the inner diameter of the second chamber 14; the pressure piston is located inside the piston short connector 9, and the pressure piston includes a first piston member 10 and a second piston member 11, the bottom end of the first piston member 10 being connected to the top end of the second piston member 11, and the diameter of the first piston member 10 being smaller than the inner diameter of the first chamber 14; The diameters of the second piston 11 and the first piston 10 are matched, with the second piston 11 having a larger diameter than the inner diameter of the first chamber. The first piston 10 has a first flow channel 15 inside and a liquid inlet 21 on its side wall, which communicates with the first flow channel 15. The locking cap 12 has an internal thread, and the piston short connector 9 has an external thread that matches the internal thread. The top end of the flushing connecting rod 13 passes through the top end of the locking cap 12. The side wall of the flushing connecting rod 13 inside the locking cap 12 has an annular flange 17. The bottom end of the flushing connecting rod 13 is inside the locking cap 12, and the interior of the flushing connecting rod 13 has a second flow channel 16.

[0068] In this embodiment of the invention, the base 22 has an annular body, with its bottom end connected to the water mixing pipeline 1. The bottom end of the piston short connector 9 is inserted into the base 22 and connected to it via a threaded structure. The first chamber and the second chamber 14 of the piston short connector 9 are interconnected. The water mixing pipeline 1 has a liquid outlet 18, which is connected to the interior of the piston short connector 9. A gap exists between the circumferential surface of the second piston member 11 of the pressure piston and the inner wall of the second chamber 14 of the piston short connector 9.

[0069] Under normal circumstances, the internal fluid pressure of the water mixing pipeline 1 is relatively high. The fluid enters the piston short-connector 9 through the outlet hole 18, pushing the second piston 11 and causing the first piston 10 to move upward. The first piston 10 gradually moves upward into the first chamber of the piston short-connector 9. Since the diameter of the second piston 11 is larger than the inner diameter of the first chamber, when the second piston 11 moves to the bottom of the first chamber, the top of the second piston 11 contacts the top of the second chamber 14, sealing the bottom opening of the first chamber located at the top of the second chamber 14, thereby preventing the fluid in the water mixing pipeline 1 from flowing out of the piston short-connector 9.

[0070] The top of the second piston 11 is provided with a first annular sealing ring 19, which is used to seal the gap between the top of the second piston and the top of the second chamber 14 to prevent fluid from entering the first chamber.

[0071] The flushing connecting rod 13 has an annular flange 17 on its side wall, and the top of the locking cap 12 has a mounting hole. The diameter of the annular flange 17 is larger than the diameter of the mounting hole.

[0072] When flushing is required at the wellhead or on the equipment, the top end of the flushing connecting rod 13 is passed upward through the mounting hole, the annular protrusion 17 is engaged inside the locking cap 12 below the mounting hole, and the bottom end of the locking cap 12 is connected to the top end of the piston short connector 9 through a threaded structure.

[0073] When the locking cap 12 is connected to the piston short connector 9, the locking cap 12 gradually moves downward along the threaded surface of the outer wall of the piston short connector 9, causing the bottom end of the flushing connecting rod 13 to move downward. The bottom end of the flushing connecting rod 13 gradually inserts into the first chamber of the piston short connector 9 from the top opening.

[0074] The bottom opening of the second flow channel 16 inside the flushing connecting rod 13 corresponds to the top opening of the first flow channel 15 inside the first piston member 10. When the bottom end of the flushing connecting rod 13 contacts the top end of the first piston member 10, the first flow channel 15 and the second flow channel 16 are connected.

[0075] As the locking cap 12 continues to move downwards, it drives the flushing connecting rod 13 to push the first piston 10 and the second piston 11 downwards. When the top surface of the second piston 11 moves away from the bottom opening of the first chamber, the inlet hole 21 on the side wall of the first piston 10 also enters the second chamber 14. The fluid in the second chamber 14 enters the first flow channel 15 through the inlet hole 21, then enters the second flow channel 16, and flows out from the top opening of the second flow channel 16. The top of the flushing connecting rod 13 is connected to a hose, and the fluid in the water mixing pipeline 1 flowing out of the second flow channel 16, i.e., warm water, can be used to flush the wellhead and equipment.

[0076] When the bottom of the second piston 11 contacts the side wall of the water mixing pipeline 1, the top part of the first piston 10 is still inside the first chamber, thus maintaining the stable position of the pressure piston. A second annular sealing ring 20 is provided on the circumferential surface of the first piston 10 to seal the gap between the side wall of the first piston 10 and the inner side wall of the first chamber, preventing fluid from locking into the gland 12.

[0077] During production operations, wellheads and equipment above the well are frequently contaminated with oil and other impurities, requiring regular flushing. However, due to the considerable distance between the water distribution room and the wellhead, water delivery for flushing is difficult and time-consuming. By installing a flushing mechanism on the water mixing pipeline 1, hot water from the pipeline can be directly used to flush the wellhead and equipment at any time. When flushing is not required, the locking cap 12 and flushing connecting rod 13 can be omitted. In use, the locking cap 12 can be directly connected to the piston short-circuit 9, which is more convenient, faster, and saves time. Furthermore, the higher water temperature in the water mixing pipeline 1 is more conducive to cleaning oil stains.

[0078] This invention upgrades and improves existing water mixing and heating processes as well as digital wellhead processes, developing a digital multifunctional dedicated wellhead water mixing system. This system avoids fluctuations in water mixing pressure and volume during actual production due to factors such as bottom hole pressure, scale buildup in the mixed water, and system pump reversal. It also prevents issues like crude oil freezing and blocking pipelines, especially at night when untimely adjustment and control of single-well water mixing volume can occur, as well as freezing of digital instruments and inaccurate data transmission. The system can automatically adjust the water mixing volume based on fluctuations in water mixing pressure and temperature, reducing losses caused by freezing and blockage. It also features water filtration and pipeline leak warning functions, reducing the workload of employees and saving costs.

[0079] The embodiments described above are merely illustrative of implementation methods of the present invention, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications, equivalent substitutions, and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A digital multifunctional dedicated wellhead water mixing system, characterized in that, include: Water mixing pipeline (1), flow regulation mechanism, filtration mechanism, temperature detection unit, leakage detection unit and controller; One end of the water mixing pipeline (1) is connected to the oil return pipeline, and the other end is connected to the metering room; The flow regulation mechanism is provided on the water mixing pipeline (1); The filter mechanism is installed inside the water mixing pipeline (1), and the filter mechanism is used to filter impurities in the fluid in the water mixing pipeline (1); The temperature detection unit is connected to the inside of the oil return pipeline and the water mixing pipeline (1) respectively. The temperature detection unit is used to detect the first real-time temperature value of the fluid in the oil return pipeline and the second real-time temperature value of the fluid in the water mixing pipeline (1). A leakage detection unit is installed on the water mixing pipeline (1), and the leakage detection unit is used to detect whether the water mixing pipeline (1) leaks; The flow regulation mechanism, the temperature detection unit and the leakage detection unit are respectively connected to the controller. The controller is used to control the flow regulation mechanism to start regulating the flow rate of the fluid entering the return oil pipeline from the water mixing pipeline (1) according to the first real-time temperature value and the second real-time temperature value detected by the temperature detection unit, so that the first real-time temperature value is greater than the first predetermined temperature. It also includes: a flushing mechanism; the flushing mechanism includes: a piston short connector (9), a pressure piston, a locking cap (12), and a flushing connecting rod (13); the bottom end of the piston short connector (9) is connected to the water mixing pipeline (1) through a base (22), the piston short connector (9) has a first chamber and a second chamber (14) inside, the first chamber is above the second chamber (14), and the inner diameter of the first chamber is smaller than the inner diameter of the second chamber (14); the pressure piston is inside the piston short connector (9), the pressure piston includes a first piston part (10) and a second piston part (11), the bottom end of the first piston part (10) is connected to the top end of the second piston part (11), and the diameter of the first piston part (10) matches the inner diameter of the first chamber. The diameter of the second piston (11) is larger than the inner diameter of the first chamber; the first piston (10) has a first flow channel (15) inside, and the side wall of the first piston (10) has an inlet hole (21) that is connected to the first flow channel (15); the locking cap (12) has an internal thread, and the piston short connector (9) has an external thread that matches the internal thread; the top end of the flushing connecting rod (13) passes through the top end of the locking cap (12), and the side wall of the flushing connecting rod (13) inside the locking cap (12) has an annular protrusion (17), the bottom end of the flushing connecting rod (13) is inside the locking cap (12), and the inside of the flushing connecting rod (13) has a second flow channel (16).

2. The digital multifunctional dedicated wellhead water mixing system according to claim 1, characterized in that, The flow regulating mechanism includes: an electric actuator (2) and a valve (3); The valve (3) is installed inside the water mixing pipeline (1) at one end near the oil return pipeline; The electric actuator (2) is installed on the water mixing pipeline (1) and is connected to the valve (3); The controller is connected to the electric actuator (2). When it is necessary to adjust the flow rate of the fluid entering the return oil pipeline from the water mixing pipeline (1), the controller controls the electric actuator (2) to start and adjust the opening of the valve (3).

3. The digital multifunctional dedicated wellhead water mixing system according to claim 1, characterized in that, The filtration mechanism includes: a cylindrical filter screen (4); The bottom of the water mixing pipeline (1) is provided with a filter screen mounting groove, and the inner side wall of the filter screen mounting groove has a certain inclination angle with the axis of the water mixing pipeline (1). On the top inner wall of the water mixing pipeline (1) corresponding to the position of the filter screen mounting groove, there is a protrusion (5); The bottom end of the cylindrical filter screen (4) is inserted into the filter screen mounting groove, and the side wall of the cylindrical filter screen (4) away from the direction of incoming water contacts the side wall of the protrusion (5).

4. The digital multifunctional dedicated wellhead water mixing system according to claim 1, characterized in that, The temperature detection unit includes: a first temperature sensor and a second temperature sensor; The first temperature sensor is installed in the water mixing pipeline (1); The second temperature sensor is installed in the oil return line; The first temperature sensor and the second temperature sensor are respectively connected to the controller.

5. The digital multifunctional dedicated wellhead water mixing system according to claim 1, characterized in that, The leakage detection unit includes: a pressure sensor (6); The pressure sensor (6) is internally connected to the water mixing pipeline (1). The pressure sensor (6) is connected to the controller. The pressure sensor (6) is used to detect the real-time pressure value inside the water mixing pipeline (1) and transmit it to the controller. The controller is used to determine whether the real-time pressure value has dropped by a predetermined pressure value within a second predetermined time. If so, leakage occurs in the water mixing pipeline (1).

6. The digital multifunctional dedicated wellhead water mixing system according to claim 5, characterized in that, Also includes: Alarm unit; The controller is connected to the alarm unit. When the controller determines that leakage has occurred in the water mixing pipeline (1), the controller controls the alarm unit to start the alarm.

7. The digital multifunctional dedicated wellhead water mixing system according to claim 1, characterized in that, Also includes: One-way control valve (7); The one-way control valve (7) is installed at one end of the water mixing pipeline (1) near the oil return pipeline. The one-way control valve (7) is used to prevent fluid in the oil return pipeline from entering the water mixing pipeline (1).

Images