An automatic fluid dispensing device for continuous tubing drilling.

Abstract

This invention discloses an automatic fluid mixing device for coiled tubing drilling, belonging to the field of petroleum machinery technology. It includes a water supply line, a mixed fluid outlet line, an intelligent control terminal, a flow meter, a pressure sensor, a skid-mounted unit, a flexible hose, a first connecting pipe, a second connecting pipe, a third connecting pipe, a centrifugal pump, an electric throttle valve, and a drag-reducing agent pump. The water supply line is sequentially equipped with an inlet union, a first butterfly valve, and a filter. The electric throttle valve is located on the first connecting pipe, and the centrifugal pump is located on the second connecting pipe. The mixed fluid outlet line is equipped with a flow meter, a second butterfly valve, a third butterfly valve, and an outlet union. One end of the flexible hose is connected to the drag-reducing agent pump, and the other end is connected to the mixed fluid outlet line. A fourth butterfly valve is located on the third connecting pipe. This invention enables real-time adjustment of pressure and flow rate, as well as precise proportional mixing of the drag-reducing agent, improving the performance of the mixed liquid.

Description

Technical Field

[0001] This invention relates to the field of petroleum machinery technology, and in particular to an automatic fluid dispensing device for continuous tubing drilling and milling. Background Technology

[0002] Currently, fluid preparation for coiled tubing drilling primarily utilizes diesel screw pumps for backflow fluid or clean water injection, and diaphragm pumps or hydraulic pumps for injecting drag-reducing agents. One end of the diaphragm pump or hydraulic pump is connected to the drag-reducing agent tank, and the other end is connected to the inlet of the diesel screw pump, thus achieving fluid mixing. After passing through the diesel screw pump, the mixture is directly pumped into the coiled tubing via a pump truck, thereby circulating and reducing the friction between the coiled tubing and the casing wall.

[0003] However, existing technologies suffer from limitations such as the inability to adjust the pressure and flow rate of the clean water supply and the inability to perform phased metering. Furthermore, the relatively high viscosity of the drag-reducing agent during pumping can easily cause blockages in the supply pump, affecting production efficiency. In addition, conventional pumping methods require relatively large quantities of drag-reducing agent solution with inaccurate mixing ratios, leading to a decline in the performance of the drag-reducing agent mixture and consequently a decrease in its friction-reducing effect.

[0004] Chinese patent document CN115680590A, published on November 19, 2024, discloses a fully automatic device and system for configuring and supplying drilling fluid, as well as a method for supplying drilling fluid. The device includes a main pump, an additive pump, a normally open valve, a pressure sensor, a first flow meter, a second flow meter, a main flow pipe, a bypass pipe, a first suction pipe, a second suction pipe, a discharge pipe, and a control module. The main pump's suction port is connected to the first suction pipeline, and its discharge port is connected to the main flow pipeline; One end of the bypass pipeline is connected to the first suction pipeline, and the other end is connected to the main flow pipeline. The normally open valve is installed on the bypass pipeline. The suction port of the additive pump is connected to the second suction line, and the discharge port is connected to the first suction line through the discharge line. The first flow meter and pressure sensor are installed on the main flow pipe; The second flow meter is installed on the discharge pipeline; The control module includes a coiled tubing construction parameter receiving unit and a control unit. The coiled tubing construction parameter receiving unit can acquire coiled tubing construction information. The control unit can receive information measured by the pressure sensor, the first flow meter, and the second flow meter, as well as the coiled tubing construction information acquired by the coiled tubing construction parameter receiving unit, and can analyze and judge the received information to control the main pump, the additive pump, and the normally open valve.

[0005] The fully automated drilling fluid preparation and supply device disclosed in this patent document can automatically start and stop, achieving fully automated preparation and supply of drilling fluid. However, it is difficult to achieve real-time adjustment of pressure and discharge rate, as well as precise proportioning of drag-reducing agents, which affects the performance of the mixed fluid. Summary of the Invention

[0006] In order to overcome the shortcomings of the prior art, the present invention provides an automatic fluid mixing device for continuous tubing drilling and milling. The present invention can realize real-time adjustment of pressure and discharge rate, as well as precise proportion of drag-reducing agent mixing and dispensing, thereby improving the performance of the mixed liquid.

[0007] This invention is achieved through the following technical solution: An automatic fluid mixing device for continuous tubing drilling includes an inlet water supply line, a mixed fluid outlet line, an intelligent control terminal, a flow meter, and a pressure sensor. Its features include: a skid mount, a flexible hose, a first connecting pipe, a second connecting pipe, a third connecting pipe, a centrifugal pump, an electric throttle valve, and a drag-reducing agent pump. The intelligent control terminal, centrifugal pump, and drag-reducing agent pump are all fixed to the skid mount. An inlet union, a first butterfly valve, and a filter are sequentially installed on the inlet water supply line. One end of the first connecting pipe is connected to the inlet water supply line, and the other end is connected to the mixed fluid outlet line. A throttle valve is installed on the first connecting pipe. One end of the second connecting pipe is connected to the inlet water supply line, and the other end of the second connecting pipe is connected to the mixed liquid outlet line. A centrifugal pump is installed on the second connecting pipe. A flow meter, a second butterfly valve, a third butterfly valve, and an outlet union are installed on the mixed liquid outlet line. One end of the flexible hose is connected to the drag-reducing agent pump, and the other end of the flexible hose is connected to the mixed liquid outlet line. The third connecting pipe is located on the side of the inlet union and the outlet union. The inlet water supply line and the mixed liquid outlet line are connected through the third connecting pipe. A fourth butterfly valve is installed on the third connecting pipe.

[0008] The flow meter and pressure sensor are electrically connected to the intelligent control terminal.

[0009] There are two centrifugal pumps, which are connected in parallel.

[0010] A fourth connecting pipe is provided between the water inlet supply pipeline and the mixed liquid outlet pipeline, and the centrifugal pump is installed on the fourth connecting pipe.

[0011] The skid-mounted system includes a skid body and a pipe and valve support frame, with the pipe and valve support frame fixed to the skid body.

[0012] The second butterfly valve is equipped with a pressure sensor, which is used to monitor the liquid supply pressure of the mixed liquid outlet pipeline and transmit the collected pressure data to the intelligent control terminal.

[0013] The drag-reducing pump is a hose pump.

[0014] The intelligent control terminal is electrically connected to the centrifugal pump and the drag-reducing agent pump respectively. The intelligent control terminal is used to control the speed and start / stop of the centrifugal pump and the drag-reducing agent pump.

[0015] The intelligent control terminal is electrically connected to the electric throttle valve and is used to control the opening degree of the electric throttle valve.

[0016] The flow meter is connected to the mixed liquid outlet pipeline via a T-junction. The flow meter is used to monitor the flow rate of the backflow liquid or clean water and transmits the collected flow data to the intelligent control terminal.

[0017] One end of the hose is located between the second butterfly valve and the third butterfly valve.

[0018] The beneficial effects of this invention are mainly reflected in the following aspects: 1. In this invention, the intelligent control terminal, centrifugal pump, and drag-reducing agent pump are all fixed on a skid. An inlet union, a first butterfly valve, and a filter are sequentially installed on the water supply line. One end of the first connecting pipe is connected to the water supply line, and the other end is connected to the mixed liquid outlet line. An electric throttle valve is installed on the first connecting pipe. One end of the second connecting pipe is connected to the water supply line, and the other end is connected to the mixed liquid outlet line. The centrifugal pump is installed on the second connecting pipe. A flow meter, a second butterfly valve, a third butterfly valve, and an outlet union are installed on the mixed liquid outlet line. One end of a flexible hose is connected to the drag-reducing agent pump, and the other end is connected to the mixed liquid outlet line. The third connecting pipe is located on the same side as the inlet and outlet unions. The water supply line and the mixed liquid outlet line are connected through the third connecting pipe. A fourth butterfly valve is installed on the third connecting pipe. Compared with existing technologies, this invention enables real-time adjustment of pressure and discharge volume, as well as precise proportional mixing of the drag-reducing agent, thereby improving the performance of the mixed liquid.

[0019] 2. This invention combines an intelligent control terminal with a drag-reducing agent pump, which can solve the problems of inaccurate dispensing of drag-reducing agents, poor performance, and high cost of drag-reducing agents when pumping traditional diaphragm pumps or screw pumps. It achieves intelligent and precise dispensing and reduces production costs.

[0020] 3. In this invention, the intelligent control terminal is electrically connected to the centrifugal pump and the drag-reducing agent pump respectively. The intelligent control terminal is used to control the speed and start / stop of the centrifugal pump and the drag-reducing agent pump, and can realize the precise proportion of drag-reducing agent mixing and automatic shutdown due to pressure buildup.

[0021] 4. In this invention, the intelligent control terminal is electrically connected to the electric throttle valve. The intelligent control terminal is used to control the opening degree of the electric throttle valve, which can realize real-time pressure adjustment.

[0022] 5. This invention enables intelligent control via a smart control terminal, allowing for real-time adjustment of the fluid supply pressure and flow rate, precise proportioning and adjustment of the drag-reducing agent liquid, improved drilling fluid performance, increased drilling efficiency, and reduced drag-reducing agent usage costs. Attached Figure Description

[0023] The present invention will now be further described in detail with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 This is a schematic diagram of the structure of the present invention; The diagram is labeled as follows: 1. Inlet water supply line, 2. Mixed liquid outlet line, 3. Intelligent control terminal, 4. Flow meter, 5. Pressure sensor, 6. Skid-mounted, 7. Hose line, 8. First connecting pipe, 9. Second connecting pipe, 10. Third connecting pipe, 11. Centrifugal pump, 12. Electric throttle valve, 13. Drag-reducing agent pump, 14. Inlet union, 15. First butterfly valve, 16. Filter, 17. Second butterfly valve, 18. Third butterfly valve, 19. Outlet union, 20. Fourth butterfly valve, 21. Fourth connecting pipe, 22. Skid, 23. Pipe and valve support frame. Detailed Implementation

[0024] Example 1 See Figure 1 An automatic fluid mixing device for continuous tubing drilling includes an inlet water supply line 1, a mixed fluid outlet line 2, an intelligent control terminal 3, a flow meter 4, a pressure sensor 5, a skid mount 6, a flexible hose 7, a first connecting pipe 8, a second connecting pipe 9, a third connecting pipe 10, a centrifugal pump 11, an electric throttle valve 12, and a drag-reducing agent pump 13. The intelligent control terminal 3, centrifugal pump 11, and drag-reducing agent pump 13 are all fixed to the skid mount 6. The inlet water supply line 1 is sequentially equipped with an inlet union 14, a first butterfly valve 15, and a filter 16. One end of the first connecting pipe 8 is connected to the inlet water supply line 1, and the other end is connected to the mixed fluid outlet line 2. The electric throttle valve 10... 2. A first connecting pipe 8 is installed. One end of the second connecting pipe 9 is connected to the inlet water supply line 1, and the other end of the second connecting pipe 9 is connected to the mixed liquid outlet line 2. A centrifugal pump 11 is installed on the second connecting pipe 9. A flow meter 4, a second butterfly valve 17, a third butterfly valve 18, and an outlet union 19 are installed on the mixed liquid outlet line 2. One end of the flexible hose 7 is connected to the drag-reducing agent pump 13, and the other end of the flexible hose 7 is connected to the mixed liquid outlet line 2. The third connecting pipe 10 is located on the side of the inlet union 14 and the outlet union 19. The inlet water supply line 1 and the mixed liquid outlet line 2 are connected through the third connecting pipe 10. A fourth butterfly valve 20 is installed on the third connecting pipe 10.

[0025] This embodiment is the most basic implementation. The intelligent control terminal 3, centrifugal pump 11, and drag-reducing agent pump 13 are all fixed on the skid 6. An inlet union 14, a first butterfly valve 15, and a filter 16 are sequentially installed on the water supply line 1. One end of the first connecting pipe 8 is connected to the water supply line 1, and the other end of the first connecting pipe 8 is connected to the mixed liquid outlet line 2. An electric throttle valve 12 is installed on the first connecting pipe 8. One end of the second connecting pipe 9 is connected to the water supply line 1, and the other end of the second connecting pipe 9 is connected to the mixed liquid outlet line 2. The centrifugal pump 11 is installed on the second connecting pipe 9. A flow meter 4, a second butterfly valve 17, a third butterfly valve 18, and an outlet union 19 are installed on the mixed liquid outlet pipeline 2. One end of the hose 7 is connected to the drag-reducing agent pump 13, and the other end of the hose 7 is connected to the mixed liquid outlet pipeline 2. The third connecting pipe 10 is located on the side of the inlet union 14 and the outlet union 19. The water supply pipeline 1 and the mixed liquid outlet pipeline 2 are connected through the third connecting pipe 10. A fourth butterfly valve 20 is installed on the third connecting pipe 10. Compared with the prior art, it can realize real-time adjustment of pressure and discharge volume, as well as precise proportion of drag-reducing agent mixing and dispensing, thereby improving the performance of the mixed liquid.

[0026] Example 2 See Figure 1 An automatic fluid mixing device for continuous tubing drilling includes an inlet water supply line 1, a mixed fluid outlet line 2, an intelligent control terminal 3, a flow meter 4, a pressure sensor 5, a skid mount 6, a flexible hose 7, a first connecting pipe 8, a second connecting pipe 9, a third connecting pipe 10, a centrifugal pump 11, an electric throttle valve 12, and a drag-reducing agent pump 13. The intelligent control terminal 3, centrifugal pump 11, and drag-reducing agent pump 13 are all fixed to the skid mount 6. The inlet water supply line 1 is sequentially equipped with an inlet union 14, a first butterfly valve 15, and a filter 16. One end of the first connecting pipe 8 is connected to the inlet water supply line 1, and the other end is connected to the mixed fluid outlet line 2. The electric throttle valve 10... 2. A first connecting pipe 8 is installed. One end of the second connecting pipe 9 is connected to the inlet water supply line 1, and the other end of the second connecting pipe 9 is connected to the mixed liquid outlet line 2. A centrifugal pump 11 is installed on the second connecting pipe 9. A flow meter 4, a second butterfly valve 17, a third butterfly valve 18, and an outlet union 19 are installed on the mixed liquid outlet line 2. One end of the flexible hose 7 is connected to the drag-reducing agent pump 13, and the other end of the flexible hose 7 is connected to the mixed liquid outlet line 2. The third connecting pipe 10 is located on the side of the inlet union 14 and the outlet union 19. The inlet water supply line 1 and the mixed liquid outlet line 2 are connected through the third connecting pipe 10. A fourth butterfly valve 20 is installed on the third connecting pipe 10.

[0027] Preferably, the flow meter 4 and the pressure sensor 5 are electrically connected to the intelligent control terminal 3.

[0028] There are two centrifugal pumps 11, which are connected in parallel.

[0029] A fourth connecting pipe 21 is provided between the water inlet supply pipeline 1 and the mixed liquid outlet pipeline 2, and the centrifugal pump 11 is installed on the fourth connecting pipe 21.

[0030] This embodiment is a preferred implementation method. It combines the intelligent control terminal 3 with the drag-reducing agent pump 13, which can solve the problems of inaccurate dispensing of drag-reducing agent, poor performance and high cost of drag-reducing agent by traditional diaphragm pumps or screw pumps. It can achieve intelligent and precise dispensing and reduce production costs.

[0031] Example 3 See Figure 1 An automatic fluid mixing device for continuous tubing drilling includes an inlet water supply line 1, a mixed fluid outlet line 2, an intelligent control terminal 3, a flow meter 4, a pressure sensor 5, a skid mount 6, a flexible hose 7, a first connecting pipe 8, a second connecting pipe 9, a third connecting pipe 10, a centrifugal pump 11, an electric throttle valve 12, and a drag-reducing agent pump 13. The intelligent control terminal 3, centrifugal pump 11, and drag-reducing agent pump 13 are all fixed to the skid mount 6. The inlet water supply line 1 is sequentially equipped with an inlet union 14, a first butterfly valve 15, and a filter 16. One end of the first connecting pipe 8 is connected to the inlet water supply line 1, and the other end is connected to the mixed fluid outlet line 2. The electric throttle valve 10... 2. A first connecting pipe 8 is installed. One end of the second connecting pipe 9 is connected to the inlet water supply line 1, and the other end of the second connecting pipe 9 is connected to the mixed liquid outlet line 2. A centrifugal pump 11 is installed on the second connecting pipe 9. A flow meter 4, a second butterfly valve 17, a third butterfly valve 18, and an outlet union 19 are installed on the mixed liquid outlet line 2. One end of the flexible hose 7 is connected to the drag-reducing agent pump 13, and the other end of the flexible hose 7 is connected to the mixed liquid outlet line 2. The third connecting pipe 10 is located on the side of the inlet union 14 and the outlet union 19. The inlet water supply line 1 and the mixed liquid outlet line 2 are connected through the third connecting pipe 10. A fourth butterfly valve 20 is installed on the third connecting pipe 10.

[0032] The flow meter 4 and the pressure sensor 5 are electrically connected to the intelligent control terminal 3.

[0033] There are two centrifugal pumps 11, which are connected in parallel.

[0034] A fourth connecting pipe 21 is provided between the water inlet supply pipeline 1 and the mixed liquid outlet pipeline 2, and the centrifugal pump 11 is installed on the fourth connecting pipe 21.

[0035] The skid 6 includes a skid body 22 and a pipe valve support frame 23, with the pipe valve support frame 23 fixed on the skid body 22.

[0036] The second butterfly valve 17 is equipped with a pressure sensor 5, which is used to monitor the liquid supply pressure of the mixed liquid outlet pipeline 2 and transmit the collected pressure data to the intelligent control terminal 3.

[0037] This embodiment is another preferred implementation. The intelligent control terminal 3 is electrically connected to the centrifugal pump 11 and the drag-reducing agent pump 13 respectively. The intelligent control terminal 3 is used to control the speed and start / stop of the centrifugal pump 11 and the drag-reducing agent pump 13, and can realize the precise proportion of drag-reducing agent mixing and automatic shutdown due to pressure buildup.

[0038] Example 4 See Figure 1 An automatic fluid mixing device for continuous tubing drilling includes an inlet water supply line 1, a mixed fluid outlet line 2, an intelligent control terminal 3, a flow meter 4, a pressure sensor 5, a skid mount 6, a flexible hose 7, a first connecting pipe 8, a second connecting pipe 9, a third connecting pipe 10, a centrifugal pump 11, an electric throttle valve 12, and a drag-reducing agent pump 13. The intelligent control terminal 3, centrifugal pump 11, and drag-reducing agent pump 13 are all fixed to the skid mount 6. The inlet water supply line 1 is sequentially equipped with an inlet union 14, a first butterfly valve 15, and a filter 16. One end of the first connecting pipe 8 is connected to the inlet water supply line 1, and the other end is connected to the mixed fluid outlet line 2. The electric throttle valve 10... 2. A first connecting pipe 8 is installed. One end of the second connecting pipe 9 is connected to the inlet water supply line 1, and the other end of the second connecting pipe 9 is connected to the mixed liquid outlet line 2. A centrifugal pump 11 is installed on the second connecting pipe 9. A flow meter 4, a second butterfly valve 17, a third butterfly valve 18, and an outlet union 19 are installed on the mixed liquid outlet line 2. One end of the flexible hose 7 is connected to the drag-reducing agent pump 13, and the other end of the flexible hose 7 is connected to the mixed liquid outlet line 2. The third connecting pipe 10 is located on the side of the inlet union 14 and the outlet union 19. The inlet water supply line 1 and the mixed liquid outlet line 2 are connected through the third connecting pipe 10. A fourth butterfly valve 20 is installed on the third connecting pipe 10.

[0039] The flow meter 4 and the pressure sensor 5 are electrically connected to the intelligent control terminal 3.

[0040] There are two centrifugal pumps 11, which are connected in parallel.

[0041] A fourth connecting pipe 21 is provided between the water inlet supply pipeline 1 and the mixed liquid outlet pipeline 2, and the centrifugal pump 11 is installed on the fourth connecting pipe 21.

[0042] The skid 6 includes a skid body 22 and a pipe valve support frame 23, with the pipe valve support frame 23 fixed on the skid body 22.

[0043] More preferably, a pressure sensor 5 is installed on the second butterfly valve 17. The pressure sensor 5 is used to monitor the liquid supply pressure of the mixed liquid outlet pipeline 2 and transmit the collected pressure data to the intelligent control terminal 3.

[0044] The drag-reducing pump 13 is a hose pump.

[0045] The intelligent control terminal 3 is electrically connected to the centrifugal pump 11 and the drag-reducing agent pump 13 respectively. The intelligent control terminal 3 is used to control the speed and start / stop of the centrifugal pump 11 and the drag-reducing agent pump 13.

[0046] The intelligent control terminal 3 is electrically connected to the electric throttle valve 12, and the intelligent control terminal 3 is used to control the opening degree of the electric throttle valve 12.

[0047] This embodiment is another preferred implementation. The intelligent control terminal 3 is electrically connected to the electric throttle valve 12. The intelligent control terminal 3 is used to control the opening degree of the electric throttle valve 12, which can realize real-time pressure adjustment.

[0048] Example 5 See Figure 1 An automatic fluid mixing device for continuous tubing drilling includes an inlet water supply line 1, a mixed fluid outlet line 2, an intelligent control terminal 3, a flow meter 4, a pressure sensor 5, a skid mount 6, a flexible hose 7, a first connecting pipe 8, a second connecting pipe 9, a third connecting pipe 10, a centrifugal pump 11, an electric throttle valve 12, and a drag-reducing agent pump 13. The intelligent control terminal 3, centrifugal pump 11, and drag-reducing agent pump 13 are all fixed to the skid mount 6. The inlet water supply line 1 is sequentially equipped with an inlet union 14, a first butterfly valve 15, and a filter 16. One end of the first connecting pipe 8 is connected to the inlet water supply line 1, and the other end is connected to the mixed fluid outlet line 2. The electric throttle valve 10... 2. A first connecting pipe 8 is installed. One end of the second connecting pipe 9 is connected to the inlet water supply line 1, and the other end of the second connecting pipe 9 is connected to the mixed liquid outlet line 2. A centrifugal pump 11 is installed on the second connecting pipe 9. A flow meter 4, a second butterfly valve 17, a third butterfly valve 18, and an outlet union 19 are installed on the mixed liquid outlet line 2. One end of the flexible hose 7 is connected to the drag-reducing agent pump 13, and the other end of the flexible hose 7 is connected to the mixed liquid outlet line 2. The third connecting pipe 10 is located on the side of the inlet union 14 and the outlet union 19. The inlet water supply line 1 and the mixed liquid outlet line 2 are connected through the third connecting pipe 10. A fourth butterfly valve 20 is installed on the third connecting pipe 10.

[0049] The flow meter 4 and the pressure sensor 5 are electrically connected to the intelligent control terminal 3.

[0050] There are two centrifugal pumps 11, which are connected in parallel.

[0051] A fourth connecting pipe 21 is provided between the water inlet supply pipeline 1 and the mixed liquid outlet pipeline 2, and the centrifugal pump 11 is installed on the fourth connecting pipe 21.

[0052] The skid 6 includes a skid body 22 and a pipe valve support frame 23, with the pipe valve support frame 23 fixed on the skid body 22.

[0053] The second butterfly valve 17 is equipped with a pressure sensor 5, which is used to monitor the liquid supply pressure of the mixed liquid outlet pipeline 2 and transmit the collected pressure data to the intelligent control terminal 3.

[0054] The drag-reducing pump 13 is a hose pump.

[0055] The intelligent control terminal 3 is electrically connected to the centrifugal pump 11 and the drag-reducing agent pump 13 respectively. The intelligent control terminal 3 is used to control the speed and start / stop of the centrifugal pump 11 and the drag-reducing agent pump 13.

[0056] The intelligent control terminal 3 is electrically connected to the electric throttle valve 12, and the intelligent control terminal 3 is used to control the opening degree of the electric throttle valve 12.

[0057] The flow meter 4 is connected to the mixed liquid outlet pipeline 2 via a T-junction. The flow meter 4 is used to monitor the flow rate of the backflow liquid or clean water and transmit the collected flow data to the intelligent control terminal 3.

[0058] One end of the flexible hose 7 is located between the second butterfly valve 17 and the third butterfly valve 18.

[0059] This embodiment is the best implementation method. Intelligent control is achieved through the intelligent control terminal 3, which enables real-time adjustment of the supply pressure and flow rate, precise proportioning and adjustment of the drag-reducing agent liquid, improvement of drilling fluid performance, increase of drilling efficiency, and reduction of drag-reducing agent usage costs.

[0060] The process of using this invention is as follows: The inlet is connected to the water tank or return drain via the water supply pipeline 14, and the outlet oil valve is connected to the pump truck's water supply pipeline to achieve water supply to the pump truck for the mixed liquid. When pumping the drag-reducing agent mixture, switch to manual mode, open the first butterfly valve 15 and the second butterfly valve 17 to start the purging procedure, and the intelligent control terminal 3 controls the centrifugal pump 11 to start purging until a stable liquid column appears on the outlet oil valve, at which point purging stops. Switch back to automatic mode, set the mixing ratio, pumping time, pumping stop pressure, and liquid discharge rate on the intelligent control terminal 3, and automatically start the drag-reducing agent pump 13 and the centrifugal pump 11. Adjust the opening of the electric throttle valve 12 according to the set discharge rate and pressure to achieve stable liquid mixing. The intelligent control terminal 3 collects the flow rate and pressure and transmits the data signal to the continuous tubing truck data acquisition system through the signal transmitter. If the pressure and displacement data exceed the set error range, the intelligent control terminal 3 will automatically control the start, stop, switch and adjust of the centrifugal pump 11, and at the same time automatically control the start, stop and adjust of the drag reducing agent pump 13 to achieve automatic shutdown due to pressure buildup.

[0061] The intelligent control terminal 3 includes a control module and a data acquisition module, which are electrically connected and integrated in the control cabinet. The intelligent control terminal 3 further includes an electrically connected operation display screen, a Siemens 1200 PLC microcontroller, a 24V switching power supply, a 5-port switch, an energy input module, relays, and a frequency converter. The intelligent control terminal 3 controls the speed and start / stop of the centrifugal pump 11 and the drag-reducing agent pump 13 through PLC control, realizes real-time discharge adjustment, and thus realizes precise adjustment of the liquid ratio. At the same time, it achieves pressure regulation by controlling the opening of the electric throttle valve 12.

Claims

1. An automatic fluid mixing device for continuous tubing drilling, comprising a water inlet supply pipeline (1), a mixed fluid outlet pipeline (2), an intelligent control terminal (3), a flow meter (4), and a pressure sensor (5), characterized in that: It also includes a skid mount (6), a flexible hose (7), a first connecting pipe (8), a second connecting pipe (9), a third connecting pipe (10), a centrifugal pump (11), an electric throttle valve (12), and a drag-reducing agent pump (13). The intelligent control terminal (3), the centrifugal pump (11), and the drag-reducing agent pump (13) are all fixed on the skid mount (6). The inlet water supply line (1) is sequentially equipped with an inlet union (14), a first butterfly valve (15), and a filter (16). One end of the first connecting pipe (8) is connected to the inlet water supply line (1), and the other end of the first connecting pipe (8) is connected to the mixed liquid outlet line (2). The electric throttle valve (12) is installed on the first connecting pipe (8), and one end of the second connecting pipe (9) is connected to the inlet water supply line (2). The water supply pipeline (1) is connected, and the other end of the second connecting pipe (9) is connected to the mixed liquid outlet pipeline (2). The centrifugal pump (11) is installed on the second connecting pipe (9). The mixed liquid outlet pipeline (2) is equipped with a flow meter (4), a second butterfly valve (17), a third butterfly valve (18) and an outlet union (19). One end of the hose (7) is connected to the drag-reducing agent pump (13), and the other end of the hose (7) is connected to the mixed liquid outlet pipeline (2). The third connecting pipe (10) is located on the side of the inlet union (14) and the outlet union (19). The water supply pipeline (1) and the mixed liquid outlet pipeline (2) are connected through the third connecting pipe (10). The third connecting pipe (10) is equipped with a fourth butterfly valve (20).

2. The automatic fluid dispensing device for coiled tubing drilling and milling according to claim 1, characterized in that: The flow meter (4) and pressure sensor (5) are electrically connected to the intelligent control terminal (3).

3. The automatic fluid dispensing device for coiled tubing drilling and milling according to claim 1, characterized in that: There are two centrifugal pumps (11), which are connected in parallel.

4. The automatic fluid dispensing device for coiled tubing drilling and milling according to claim 1, characterized in that: A fourth connecting pipe (21) is provided between the water supply pipeline (1) and the mixed liquid outlet pipeline (2), and the centrifugal pump (11) is provided on the fourth connecting pipe (21).

5. The automatic fluid dispensing device for coiled tubing drilling and milling according to claim 1, characterized in that: The skid (6) includes a skid body (22) and a pipe valve support frame (23), which is fixed on the skid body (22).

6. The automatic fluid dispensing device for coiled tubing drilling and milling according to claim 1, characterized in that: The second butterfly valve (17) is equipped with a pressure sensor (5). The pressure sensor (5) is used to monitor the liquid supply pressure of the mixed liquid outlet pipeline (2) and transmit the collected pressure data to the intelligent control terminal (3).

7. The automatic fluid dispensing device for continuous tubing drilling and milling according to claim 1, characterized in that: The drag-reducing pump (13) is a hose pump.

8. The automatic fluid dispensing device for coiled tubing drilling and milling according to claim 1, characterized in that: The intelligent control terminal (3) is electrically connected to the centrifugal pump (11) and the drag-reducing agent pump (13) respectively. The intelligent control terminal (3) is used to control the speed and start / stop of the centrifugal pump (11) and the drag-reducing agent pump (13).

9. The automatic fluid dispensing device for coiled tubing drilling and milling according to claim 1, characterized in that: The intelligent control terminal (3) is electrically connected to the electric throttle valve (12), and the intelligent control terminal (3) is used to control the opening degree of the electric throttle valve (12).

10. The automatic fluid dispensing device for continuous tubing drilling and milling according to claim 1, characterized in that: The flow meter (4) is connected to the mixed liquid outlet pipeline (2) by a three-way connection. The flow meter (4) is used to monitor the flow rate of the backflow liquid or clean water and transmit the collected flow data to the intelligent control terminal (3).

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