Oilfield single well two-phase automatic metering device

Abstract

This invention relates to the field of oilfield single-well two-phase automatic metering device, specifically applicable to the field of oil production metering in low-yield oilfield blocks. The device comprises a metering inlet pipe, a metering outlet pipe, a right piston metering chamber, and a left piston metering chamber. A right piston is movable and sealed within the right piston metering chamber. The right piston metering chamber is connected to the metering inlet pipe via a right piston inlet electric valve and to the metering outlet pipe via a right piston outlet electric valve. A right piston connecting rod is connected to the right piston. This invention features a simple structure and ease of use. The piston moves continuously under the pressure of the oil well's produced fluid. A linkage device and a valve switching contact switch coordinate valve switching and piston movement, ultimately achieving continuous and accurate metering of single-well oil production. This improves the efficiency of crude oil production management in both high- and low-yield oilfield blocks.

Description

Technical Field

[0001] The invention relates to the field of oilfield production liquid metering, and is particularly suitable for the field of single-well oil production metering in low-production blocks of oilfields, and specifically is an oilfield single-well two-phase automatic metering device. Background Art

[0002] Oilfield single well metering is a basic work with huge workload. The accuracy, authenticity and reliability of its metering data directly affect the reasonable development deployment and economic benefits of the oilfield. Due to the existence of many problems such as low single well production, gas content, sand production, wax deposition, intermittent pumping and intermittent liquid production, there is no single well metering technology currently being widely promoted and used in oilfields. All major oilfields are still in the research and exploration stage, especially in the CO2 flooding, polymer flooding, microbial flooding, water flooding and other projects to improve oil recovery currently being carried out in Yanchang Oilfield. All of them require a more accurate evaluation of the implementation plan, which puts higher requirements on single well metering. Therefore, it is very necessary to conduct a more in-depth analysis of the oil and gas production of a single well, conduct a more detailed study of the metering process, and develop a high-precision, wide-range oilfield single well two-phase automatic metering device. Summary of the invention

[0003] In order to solve the above problems, the present invention provides an oilfield single well two-phase automatic metering device with a simple structure, which uses the pressure of the oil well production fluid to drive the piston to move continuously to achieve continuous and accurate metering of the single well oil production.

[0004] The oilfield single-well two-phase automatic metering device of the present invention comprises a metering liquid production inlet pipe, a metering liquid production outlet pipe, a right piston metering chamber and a left piston metering chamber, wherein a right piston is movable and sealedly connected in the right piston metering chamber, the right piston metering chamber is connected to the metering liquid production inlet pipe through a right piston inlet electric valve, the right piston metering chamber is connected to the metering liquid production outlet pipe through a right piston outlet electric valve, the right piston is connected to a right piston connecting rod, and one end of the right piston connecting rod extends out of the right piston metering chamber;

[0005] A left piston is movable and sealed in the left piston metering chamber, the left piston metering chamber is connected to a metering liquid production inlet pipe through a left piston inlet electric valve, the left piston metering chamber is connected to a metering liquid production outlet pipe through a left piston outlet electric valve, a left piston connecting rod is connected to the left piston, one end of the left piston connecting rod extends out of the left piston metering chamber;

[0006] It also includes a linkage device and a valve switching contact switch, and the ends of the right piston connecting rod and the left piston connecting rod extending out of the piston metering cavity are both connected to the linkage device;

[0007] The right piston inlet electric valve, the right piston outlet electric valve, the left piston inlet electric valve and the left piston outlet electric valve are all electrically connected to the valve switching contact switch;

[0008] When the right piston metering chamber begins to flow in, the valve switches the contact switch and the linkage device to control the outflow of liquid from the left piston metering chamber. When the right piston metering chamber is full of liquid, the valve switches the contact switch and the linkage device to control the left piston metering chamber to start flowing in, and the right piston metering chamber starts discharging liquid.

[0009] Preferably, the linkage device comprises a drive shaft and a linkage blade, the linkage blade is rotatably arranged on the drive shaft, and one end of the right piston connecting rod extending out of the right piston metering chamber and one end of the left piston connecting rod extending out of the left piston metering chamber are both rotatably connected to the linkage blade;

[0010] The connection point between the right piston connecting rod and the linkage blade and the connection point between the left piston connecting rod and the linkage blade are respectively located on both sides of the rotation axis of the linkage blade;

[0011] When the metering chamber of the right piston is filled with liquid, the right piston pushes the linkage blade to rotate, and the linkage blade pushes the left piston to move in the metering chamber of the left piston, and the metering chamber of the left piston is discharged.

[0012] Preferably, the valve switching contact switch is provided with a left contact and a right contact, and the right piston inlet electric valve, the right piston outlet electric valve, the left piston inlet electric valve and the left piston outlet electric valve are connected to the right contact and the left contact respectively;

[0013] When the linkage blade touches the right contact, the right piston inlet electric valve opens, the right piston outlet electric valve closes, the left piston inlet electric valve closes, and the left piston outlet electric valve opens; when the linkage blade touches the left contact, the right piston inlet electric valve closes, the right piston outlet electric valve opens, the left piston inlet electric valve opens, and the left piston outlet electric valve closes.

[0014] Or preferably, it also includes a water analysis device for analyzing the water content in the produced liquid, wherein the water analysis device is connected to the metered produced liquid inlet pipe via a water analysis inlet pipe, and the water analysis device is connected to the metered produced liquid outlet pipe via a water analysis outlet pipe.

[0015] Preferably, the water-containing analysis device comprises a water-containing analysis piston chamber, in which a water-containing analysis piston is movable and sealedly connected, and the water-containing analysis inlet pipe and the water-containing analysis outlet pipe are both in communication with the water-containing analysis piston and the sealed area surrounded by the water-containing analysis piston chamber;

[0016] The water analysis inlet pipe is provided with a water analysis inlet electric valve, and the water analysis outlet pipe is provided with a water analysis outlet electric valve;

[0017] A water analyzer is fixedly arranged on one side of the water analysis piston facing the sealing area surrounded by the water analysis piston and the water analysis piston cavity;

[0018] It also includes two limit switches arranged on the water analysis piston cavity to limit the displacement of the water analysis piston, one limit switch is arranged on the side of the sealed area surrounded by the water analysis piston and the water analysis piston cavity facing the water analyzer, the other limit switch is arranged in the water analysis piston cavity, and the water analysis piston is arranged in the water analysis piston cavity between the two limit switches.

[0019] Preferably, the water-containing analysis piston is also connected to the drive shaft via an auxiliary device;

[0020] The auxiliary device comprises a linkage head rotatably sleeved on the end of the driving shaft, an intermediate blade is fixedly connected to the peripheral surface of the linkage head, and the intermediate blade is connected to the water analysis piston through a water analysis connecting rod;

[0021] The linkage head comprises a linkage housing, which is axially fixedly sleeved on the driving shaft, the intermediate blades are fixedly arranged on the outer circumference of the linkage housing, and a plurality of one-way meshing teeth are evenly distributed on the inner circumference of the linkage housing along the circumference of the linkage housing;

[0022] A connector is also provided in the linkage housing, and the connector includes a connecting body, and the connecting body is fixedly connected to the end of the driving shaft, and two toggle pins are provided on a surface of the connecting body away from the driving shaft, and the central axes of the two toggle pins are located on the same straight line and perpendicular to the central axis of the driving shaft;

[0023] The two toggle pins are respectively connected to the connecting body through a sliding platform fixedly connected at one end thereof, and the other ends of the two toggle pins extend toward the one-way meshing teeth;

[0024] The two toggle pins are sleeved with a return spring, one end of the return spring abuts against the slide table, and the other end abuts against the connecting body;

[0025] A separation device is also provided between the two slides to drive the two slides away from each other. When the separation device is activated, the two slides move away from each other, the two return springs are compressed, and the toggle pins are extended out of the connecting body to match the one-way meshing teeth, thereby limiting the linkage head from rotating in the same direction as the drive shaft.

[0026] Preferably, the one-way meshing teeth include meshing teeth and supporting teeth, wherein the supporting teeth are fixedly arranged on the inner circumferential surface of the linkage housing, the meshing teeth cover the supporting teeth, and one end of the meshing teeth is rotatably connected to the linkage housing, and the other end is connected to the supporting teeth through a meshing spring;

[0027] When the rotating shaft rotates in the forward direction, driving the connecting body to rotate, the end of the push pin extending from the connecting body is matched and connected with the meshing tooth, limiting the linkage housing from rotating with the rotating shaft. When the rotating shaft rotates in the reverse direction, the end of the push pin extending from the connecting body squeezes the meshing tooth to move toward the supporting tooth, the meshing spring is compressed, and the linkage housing remains stationary.

[0028] Preferably, the separation device includes a lifting rod, one end of which is fixedly connected to a conical separation head, and a separation surface is provided on the ends of the two slides that are close to each other. The separation surfaces on the two slides form a separation area that matches the separation head. When the separation head extends into the separation area, the separation head drives the two slides away from each other; when the separation head retracts from the separation area, the two slides approach each other under the action of the return spring.

[0029] Preferably, a driving device is connected to one end of the lifting rod away from the separation head, and the driving device includes a valve body, and one end of the lifting rod away from the separation head extends into the valve body, and a moving iron core is arranged on the end of the lifting rod extending into the valve body, and an electromagnetic coil is arranged on the valve body in the circumference of the moving iron core, and an electromagnetic valve reset spring is also sleeved on the lifting rod, and one end of the electromagnetic valve reset spring abuts against the valve body, and the other end abuts against the moving iron core;

[0030] When the electromagnetic coil is energized, the moving iron core drives the lifting rod to move toward the separation head. When the electromagnetic coil is de-energized, the moving iron core is reset under the action of the electromagnetic valve reset spring.

[0031] Preferably, the water content analyzer is model SK-100.

[0032] The invention has a simple structure and is easy to use. The piston is pushed to move continuously by the pressure of the oil well production fluid. The linkage device and the valve switching contact switch complete the coordination of valve switching and piston movement, and finally realize the continuous and accurate measurement of single well oil production. It provides a basis for accurately grasping the production dynamics of oil wells and crude oil production, and improves the efficiency of crude oil production management in low-yield oilfields.

[0033] The present invention utilizes a water content analysis device to perform real-time water content analysis on oil well production fluid, which can not only accurately measure production benefits and promote the rational development and deployment of oil fields, but also provide more accurate data basis for the implementation of effect analysis and evaluation of CO2 recovery, microbial oil recovery, water injection and other recovery enhancement projects popular in major oil fields at this stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a schematic diagram of the structure of the present invention.

[0035] Figure 2 It is a schematic diagram of the linkage head structure.

[0036] Figure 3 A schematic diagram of the drive device.

[0037] Figure 4 Schematic diagram of one-way meshing teeth.

[0038] Figure numerals: 1-linked blade, 2-right piston connecting rod, 3-right piston metering chamber, 4-right piston inlet electric valve, 5-right piston outlet electric valve, 6-left piston metering chamber, 7-metering liquid production inlet pipe, 8-metering liquid production outlet pipe, 9-left piston inlet electric valve, 10-left piston outlet electric valve, 11-water analysis inlet electric valve, 12-water analysis outlet electric valve, 13-water analysis piston chamber, 14-water analyzer, 15-linked head, 16-driving device, 17-driving shaft, 18-valve switching contact switch, 19-limit switch, 20-one-way meshing teeth, 21-sliding pin, 22-reset spring, 23-separation head, 24-moving iron core, 25-lifting rod, 26-solenoid valve reset spring, 27-solenoid coil, 28-meshing spring. DETAILED DESCRIPTION

[0039] The oilfield single-well two-phase automatic metering device of the present invention comprises a metering liquid production inlet pipe 7, a metering liquid production outlet pipe 8, a right piston metering chamber 3 and a left piston metering chamber 6, and is characterized in that a right piston is movable and sealed in the right piston metering chamber 3, the right piston metering chamber 3 is connected to the metering liquid production inlet pipe 7 through a right piston inlet electric valve 4, the right piston metering chamber 3 is connected to the metering liquid production outlet pipe 8 through a right piston outlet electric valve 5, the right piston is connected to a right piston connecting rod 2, and one end of the right piston connecting rod 2 extends out of the right piston metering chamber 3;

[0040] A left piston is movable and sealed in the left piston metering chamber 6, the left piston metering chamber 6 is connected to a metering liquid production inlet pipe 7 through a left piston inlet electric valve 9, and the left piston metering chamber 6 is connected to a metering liquid production outlet pipe 8 through a left piston outlet electric valve 10. A left piston connecting rod is connected to the left piston, and one end of the left piston connecting rod extends out of the left piston metering chamber 6;

[0041] It also includes a linkage device and a valve switching contact switch 18, and the ends of the right piston connecting rod 2 and the left piston connecting rod extending out of the piston metering cavity are both connected to the linkage device;

[0042] The right piston inlet electric valve 4, the right piston outlet electric valve 5, the left piston inlet electric valve 9 and the left piston outlet electric valve 10 are all electrically connected to the valve switching contact switch 18;

[0043] When the right piston metering chamber 3 starts to take in liquid, the valve switching contact switch 18 and the linkage device control the outflow of liquid from the left piston metering chamber 6. When the right piston metering chamber 3 is full of liquid, the valve switching contact switch 18 and the linkage device control the left piston metering chamber 6 to start taking in liquid, and the right piston metering chamber 3 starts to discharge liquid.

[0044] The linkage device comprises a drive shaft 17 and a linkage blade 1, wherein the linkage blade 1 is rotatably arranged on the drive shaft 17, and an end of the right piston connecting rod 2 extending out of the right piston metering chamber 3 and an end of the left piston connecting rod extending out of the left piston metering chamber 6 are both rotatably connected to the linkage blade 1;

[0045] The connection point between the right piston connecting rod 2 and the linkage blade 1 and the connection point between the right piston connecting rod and the linkage blade 1 are respectively located on both sides of the rotation axis of the linkage blade 1;

[0046] When the right piston metering chamber 3 is filled with liquid, the right piston pushes the linkage blade 1 to rotate, and the linkage blade 1 pushes the left piston to move in the left piston metering chamber 6, and the left piston metering chamber 6 is discharged.

[0047] The valve switching contact switch 18 is provided with a left contact and a right contact, and the right piston inlet electric valve 4, the right piston outlet electric valve 5, the left piston inlet electric valve 9 and the left piston outlet electric valve 10 are respectively connected to the right contact and the left contact;

[0048] When the linkage blade 1 touches the right contact point, the right piston inlet electric valve 4 opens, the right piston outlet electric valve 5 closes, the left piston inlet electric valve 9 closes, and the left piston outlet electric valve 10 opens; when the linkage blade 1 touches the left contact point, the right piston inlet electric valve 4 closes, the right piston outlet electric valve 5 opens, the left piston inlet electric valve 9 opens, and the left piston outlet electric valve 10 closes.

[0049] It also includes a water analysis device for analyzing the water content in the produced liquid. The water analysis device is connected to the metered produced liquid inlet pipe 7 through a water analysis inlet pipe, and is connected to the metered produced liquid outlet pipe 8 through a water analysis outlet pipe.

[0050] The water analysis device comprises a water analysis piston chamber 13, in which a water analysis piston is movable and sealed, and the water analysis inlet pipe and the water analysis outlet pipe are both connected to the sealed area surrounded by the water analysis piston and the water analysis piston chamber 13;

[0051] The water analysis inlet pipe is provided with a water analysis inlet electric valve 11, and the water analysis outlet pipe is provided with a water analysis outlet electric valve 12;

[0052] A water analyzer 14 is fixedly arranged on one side of the water analysis piston facing the sealing area surrounded by the water analysis piston and the water analysis piston cavity 13;

[0053] It also includes two limit switches 19 arranged on the water analysis piston cavity 13 to limit the displacement of the water analysis piston. One limit switch 19 is arranged on the side of the sealed area surrounded by the water analysis piston and the water analysis piston cavity 13 facing the water analyzer 14, and the other limit switch 19 is arranged in the water analysis piston cavity 13, and the water analysis piston is arranged in the water analysis piston cavity 13 between the two limit switches 19.

[0054] The water-containing analysis piston is also connected to the drive shaft 17 through an auxiliary device;

[0055] The auxiliary device comprises a linkage head 15 rotatably sleeved on the end of a driving shaft 17, and an intermediate blade is fixedly connected to the peripheral surface of the linkage head 15, and the intermediate blade is connected to the water analysis piston through a water analysis connecting rod;

[0056] The linkage head 15 comprises a linkage housing, which is axially fixedly sleeved on the drive shaft 17, the intermediate blades are fixedly arranged on the outer circumference of the linkage housing, and a plurality of one-way meshing teeth 20 are evenly distributed on the inner circumference of the linkage housing along the circumference of the linkage housing;

[0057] A connector is also provided in the linkage housing, and the connector includes a connecting body, and the connecting body is fixedly connected to the end of the drive shaft 17, and two toggle pins 21 are provided on a surface of the connecting body away from the drive shaft 17, and the central axes of the two toggle pins 21 are located on the same straight line and perpendicular to the central axis of the drive shaft 17;

[0058] The two toggle pins 21 are respectively connected to the connecting body through a sliding platform fixedly connected at one end thereof, and the other ends of the two toggle pins 21 extend toward the one-way meshing teeth 20;

[0059] The two toggle pins 21 are sleeved with a return spring 22, one end of the return spring 22 abuts against the slide table, and the other end abuts against the connecting body;

[0060] A separation device is also provided between the two slides to drive the two slides away from each other. When the separation device is activated, the two slides move away from each other, the two return springs 22 are compressed, and the push pins 21 are extended out of the connecting body to match and connect with the one-way meshing teeth 20, limiting the linkage head 15 to rotate in the same direction as the drive shaft 17.

[0061] The one-way meshing teeth 20 each include a meshing tooth and a supporting tooth, wherein the supporting tooth is fixedly arranged on the inner circumference of the linkage housing, the meshing tooth covers the supporting tooth, and one end of the meshing tooth is rotatably connected to the linkage housing, and the other end is connected to the supporting tooth through a meshing spring 28;

[0062] When the rotating shaft rotates forward, driving the connecting body to rotate, one end of the push pin 21 extending from the connecting body is matched and connected with the meshing tooth, limiting the linkage housing from rotating with the rotating shaft. When the rotating shaft rotates reversely, one end of the push pin 21 extending from the connecting body squeezes the meshing tooth to move toward the supporting tooth, the meshing spring 28 is compressed, and the linkage housing remains stationary.

[0063] The separation device includes a lifting rod 25, one end of which is fixedly connected to a conical separation head 23. A separation surface is provided on the ends of the two slides that are close to each other. The separation surfaces on the two slides form a separation area that matches the separation head 23. When the separation head 23 extends into the separation area, the separation head 23 drives the two slides away from each other; when the separation head 23 retracts from the separation area, the two slides approach each other under the action of the return spring.

[0064] The end of the lifting rod 25 away from the separation head 23 is connected to a driving device 16, and the driving device 16 includes a valve body. The end of the lifting rod 25 away from the separation head 23 extends into the valve body, and a moving iron core 24 is arranged on the end of the lifting rod 25 extending into the valve body. An electromagnetic coil 27 is arranged on the valve body in the circumferential direction of the moving iron core 24. The lifting rod 25 is also sleeved with an electromagnetic valve reset spring 26, and one end of the electromagnetic valve reset spring 26 abuts against the valve body, and the other end abuts against the moving iron core 24.

[0065] When the electromagnetic coil 27 is energized, the moving iron core 24 drives the lifting rod 25 to move toward the separation head 23 . When the electromagnetic coil 27 is de-energized, the moving iron core 24 is reset under the action of the electromagnetic valve reset spring 26 .

[0066] Both limit switches 19 are electrically connected to the drive device 16. When the water-containing analysis piston touches the limit switch 19, the electromagnetic coil 27 is energized or de-energized.

[0067] The water content analyzer 14 is of model SK-100.

[0068] When the linkage blade 1 touches the right contact point, the right piston inlet electric valve 4 opens, the right piston outlet electric valve 5 closes, the left piston inlet electric valve 9 closes, and the left piston outlet electric valve 10 opens; when the linkage blade 1 touches the left contact point, the right piston inlet electric valve 4 closes, the right piston outlet electric valve 5 opens, the left piston inlet electric valve 9 opens, and the left piston outlet electric valve 10 closes.

[0069] The water content analyzer 14 is SK-100 of Taylor Instruments, and the limit switch 19 is CDJ10-I1A12AN of Delixi.

[0070] Water content analysis:

[0071] Water content analysis A water content analyzer 14 is installed in the piston to analyze the water content of the static oil produced in the piston cavity. The frequency of water content analysis can be set as needed.

[0072] After the metering device starts to run, water content analysis is performed every 30 minutes, and the control process is as follows: after the time interval is reached, the water content analysis inlet electric valve 11 is opened, and the water content analysis inlet electric valve 11 is closed after the single well oil production fills the water content analysis piston chamber 13. After one minute of rest, the water content analyzer 14 performs water content analysis, and then the lifting rod 25 is extended to extend the separation head 23 on the lifting rod 25 into the separation area. The separation head 23 drives the two slides to move away from each other, and pushes the toggle pin 21 to extend the connecting body and match the one-way meshing tooth 20 to limit the linkage head 15 to rotate in the same direction with the driving shaft 17, pushing the water content analysis piston to discharge the crude oil in the water content analysis piston chamber 13. After the water content analysis piston touches the limit switch 19, the lifting rod 25 retracts, and the separation head 23 retracts from the separation area. Under the action of the return spring, the two slides approach each other and reset.

[0073] Measurement:

[0074] like Figure 1 As shown, the right piston inlet electric valve 4 and the left piston outlet electric valve 10 are opened, and the metered production liquid enters the right piston metering chamber 3 from the metered production liquid inlet pipe 7, pushing the right piston to move to the right, so that the right piston connecting rod 2 pushes the linkage blade 1 to rotate clockwise, driving the left piston connecting rod to cause the left piston to move to the left, and the metered production liquid in the left piston metering chamber 6 is discharged to the metered production liquid outlet pipe 8. When the linkage blade 1 touches the valve switching contact switch 18, the right piston inlet electric valve 4 and the left piston outlet electric valve 10 are closed, the left piston inlet electric valve 9 and the right piston outlet electric valve 5 are opened, and the metered production liquid enters the left piston metering chamber 6 from the metered production liquid inlet pipe 7, pushing the left piston baffle to move to the right, causing the linkage blade 1 to rotate counterclockwise, driving the right piston connecting rod 2 to cause the right piston to move to the left, and the metered production liquid in the right piston metering chamber 3 is discharged to the metered production liquid outlet pipe 8. When the linkage blade 1 touches the valve switching contact switch 18 again, it is reversed to complete a metering cycle.

Claims

1. An oilfield single-well two-phase automatic metering device, comprising a metering liquid production inlet pipe (7), a metering liquid production outlet pipe (8), a right piston metering chamber (3) and a left piston metering chamber (6), characterized in that: A right piston is movable and sealed in the right piston metering chamber (3); the right piston metering chamber (3) is connected to a metering liquid inlet pipe (7) via a right piston inlet electric valve (4); the right piston metering chamber (3) is connected to a metering liquid outlet pipe (8) via a right piston outlet electric valve (5); a right piston connecting rod (2) is connected to the right piston, and one end of the right piston connecting rod (2) extends out of the right piston metering chamber (3); A left piston is movable and sealed in the left piston metering chamber (6); the left piston metering chamber (6) is connected to a metered liquid production inlet pipe (7) via a left piston inlet electric valve (9); the left piston metering chamber (6) is connected to a metered liquid production outlet pipe (8) via a left piston outlet electric valve (10); a left piston connecting rod is connected to the left piston, one end of the left piston connecting rod protrudes from the left piston metering chamber (6); It also includes a linkage device and a valve switching contact switch (18), and the ends of the right piston connecting rod (2) and the left piston connecting rod extending out of the piston metering chamber are both connected to the linkage device; The right piston inlet electric valve (4), the right piston outlet electric valve (5), the left piston inlet electric valve (9) and the left piston outlet electric valve (10) are all electrically connected to the valve switching contact switch (18); When the right piston metering chamber (3) starts to take in liquid, the valve switches the contact switch (18) and the linkage device to control the left piston metering chamber (6) to cause the produced liquid to flow out; when the right piston metering chamber (3) is full of produced liquid, the valve switches the contact switch (18) and the linkage device to control the left piston metering chamber (6) to start taking in liquid, and the right piston metering chamber (3) to start discharging liquid; It also includes a water content analysis device for analyzing the water content in the produced liquid, wherein the water content analysis device is connected to the metered produced liquid inlet pipe (7) via a water content analysis inlet pipe, and the water content analysis device is connected to the metered produced liquid outlet pipe (8) via a water content analysis outlet pipe; The water-containing analysis device comprises a water-containing analysis piston chamber (13), a water-containing analysis piston movably and sealingly connected in the water-containing analysis piston chamber (13), and the water-containing analysis inlet pipe and the water-containing analysis outlet pipe are both in communication with the sealed area enclosed by the water-containing analysis piston and the water-containing analysis piston chamber (13); The water analysis inlet pipe is provided with a water analysis inlet electric valve (11), and the water analysis outlet pipe is provided with a water analysis outlet electric valve (12); A water analyzer (14) is fixedly arranged on one side of the water analysis piston facing the sealing area enclosed by the water analysis piston and the water analysis piston cavity (13); It also includes two limit switches (19) arranged on the water analysis piston chamber (13) to limit the displacement of the water analysis piston, one limit switch (19) being arranged on a side of a sealed area enclosed by the water analysis piston and the water analysis piston chamber (13) facing the water analysis instrument (14), the other limit switch (19) being arranged in the water analysis piston chamber (13), and the water analysis piston being arranged in the water analysis piston chamber (13) between the two limit switches (19); The limit switch (19) is CDJ10-I1A12AN from Delixi.

2. The oilfield single well two-phase automatic metering device as claimed in claim 1, characterized in that: The linkage device comprises a drive shaft (17) and a linkage blade (1); the linkage blade (1) is rotatably arranged on the drive shaft (17); an end of the right piston connecting rod (2) extending out of the right piston metering chamber (3) and an end of the left piston connecting rod extending out of the left piston metering chamber (6) are both rotatably connected to the linkage blade (1); The connection point between the right piston connecting rod (2) and the linkage blade (1) and the connection point between the left piston connecting rod and the linkage blade (1) are respectively located on both sides of the rotation axis of the linkage blade (1); When the right piston metering chamber (3) is filled with liquid, the right piston pushes the linkage blade (1) to rotate, and the linkage blade (1) pushes the left piston to move in the left piston metering chamber (6), and the left piston metering chamber (6) is discharged.

3. The oilfield single well two-phase automatic metering device as claimed in claim 2, characterized in that: The valve switching contact switch (18) is provided with a left contact and a right contact, and the right piston inlet electric valve (4), the right piston outlet electric valve (5), the left piston inlet electric valve (9) and the left piston outlet electric valve (10) are respectively connected to the right contact and the left contact; When the linkage blade (1) touches the right contact point, the right piston inlet electric valve (4) opens, the right piston outlet electric valve (5) closes, the left piston inlet electric valve (9) closes, and the left piston outlet electric valve (10) opens; When the linkage blade (1) touches the left contact point, the right piston inlet electric valve (4) is closed, the right piston outlet electric valve (5) is opened, the left piston inlet electric valve (9) is opened, and the left piston outlet electric valve (10) is closed.

4. The oilfield single well two-phase automatic metering device as claimed in claim 3, characterized in that: The water-containing analysis piston is also connected to the drive shaft (17) via an auxiliary device; The auxiliary device comprises a linkage head (15) rotatably sleeved on the end of a drive shaft (17), an intermediate blade being fixedly connected to the circumferential surface of the linkage head (15), and the intermediate blade being connected to the water analysis piston via a water analysis connecting rod; The linkage head (15) comprises a linkage housing, the linkage housing is axially fixedly sleeved on the drive shaft (17), the intermediate blades are fixedly arranged on the outer circumferential surface of the linkage housing, and a plurality of one-way meshing teeth (20) are evenly distributed on the inner circumferential surface of the linkage housing along the circumference of the linkage housing; A connector is also provided in the linkage housing, the connector comprising a connecting body, the connecting body being fixedly connected to the end of the drive shaft (17), two shifting pins (21) being provided on a surface of the connecting body facing away from the drive shaft (17), the central axes of the two shifting pins (21) being located on the same straight line and perpendicular to the central axis of the drive shaft (17); The two toggle pins (21) are respectively slidably connected to the connection body via a slide fixedly connected at one end facing each other, and the other ends of the two toggle pins (21) extend toward the one-way meshing teeth (20); The two toggle pins (21) are sleeved with a return spring (22), one end of the return spring (22) abuts against the slide table, and the other end abuts against the connection body; A separation device is also provided between the two slides to drive the two slides away from each other. When the separation device is activated, the two slides move away from each other, the two return springs (22) are compressed, and the push pins (21) are both extended out of the connection body to match and connect with the one-way meshing teeth (20), thereby limiting the linkage head (15) from rotating in the same direction as the drive shaft (17).

5. The oilfield single well two-phase automatic metering device as claimed in claim 4, characterized in that: The one-way meshing teeth (20) each comprise a meshing tooth and a supporting tooth, wherein the supporting tooth is fixedly arranged on the inner circumferential surface of the linkage housing, the meshing tooth covers the supporting tooth, and one end of the meshing tooth is rotatably connected to the linkage housing, and the other end is connected to the supporting tooth via a meshing spring (28); When the rotating shaft rotates in the forward direction, the connecting body is driven to rotate, and one end of the push pin (21) extending from the connecting body is matched and connected with the meshing tooth, thereby limiting the linkage housing from rotating along with the rotating shaft. When the rotating shaft rotates in the reverse direction, one end of the push pin (21) extending from the connecting body presses the meshing tooth to move toward the supporting tooth, and the meshing spring (28) is compressed, so that the linkage housing remains stationary.

6. The oilfield single well two-phase automatic metering device as claimed in claim 5, characterized in that: The separation device comprises a lifting rod (25), one end of which is fixedly connected to a conical separation head (23), and a separation surface is provided on the ends of the two slides that are close to each other. The separation surfaces on the two slides form a separation area that matches the separation head (23). When the separation head (23) extends into the separation area, the separation head (23) drives the two slides to move away from each other; when the separation head (23) retracts from the separation area, the two slides move closer to each other under the action of a return spring.

7. The oilfield single well two-phase automatic metering device as claimed in claim 6, characterized in that: The end of the lifting rod (25) away from the separation head (23) is connected to a driving device (16), and the driving device (16) comprises a valve body. The end of the lifting rod (25) away from the separation head (23) extends into the valve body, and a moving iron core (24) is arranged on the end of the lifting rod (25) extending into the valve body. An electromagnetic coil (27) is arranged on the valve body in the circumferential direction of the moving iron core (24). The lifting rod (25) is also sleeved with an electromagnetic valve return spring (26), and one end of the electromagnetic valve return spring (26) abuts against the valve body, and the other end abuts against the moving iron core (24); When the electromagnetic coil (27) is energized, the moving iron core (24) drives the lifting rod (25) to move toward the separation head (23); when the electromagnetic coil (27) is de-energized, the moving iron core (24) is reset under the action of the electromagnetic valve reset spring (26).

8. The oilfield single well two-phase automatic metering device as claimed in claim 7, characterized in that: The water content analyzer (14) is of model SK-100.

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