阅读说明：本技术 一种油井油气水三相流计量装置和计量方法 (Oil well oil-gas-water three-phase flow metering device and metering method ) 是由 范者正 田云峰 任鹏宇 佟磊 李维亮 于 2021-01-06 设计创作，主要内容包括：本发明公开了一种油井油气水三相流计量装置和计量方法,所述的计量装置包括智能控制器、双向油缸、称重传感器、电子尺、限位霍尔开关、电磁阀、液位传感器、温度传感器、电加热保温装置、截止阀、安全阀、单向阀、气体流量计、连接管和底座,本油井油气水三相流计量装置,能够在线自动计量、结构简单、安装和操作方便、成本低,安全环保,本油井油气水三相流计量方法采用称重方法计量产出液,采用体积法计量产出气和含水率,同时套管气通过单独的温压一套流量计计量,减少了产出液的含气量和气体对泵工况以及对计量精度的影响,通过对不同温度压力下液位测量值的实时修正,计算油气水三相流量,计量精度高。(The invention discloses an oil well oil gas water three-phase flow metering device and a metering method, wherein the metering device comprises an intelligent controller, a two-way oil cylinder, a weighing sensor, an electronic ruler, a limit Hall switch, an electromagnetic valve, a liquid level sensor, a temperature sensor, an electric heating and heat preserving device, a stop valve, a safety valve, a one-way valve, a gas flowmeter, a connecting pipe and a base, the oil well oil gas water three-phase flow metering device can automatically meter on line, has simple structure, convenient installation and operation, low cost, safety and environmental protection, the oil well oil gas water three-phase flow metering method adopts the weighing method to meter the output liquid, adopts the volume method to meter the output gas and the water content, simultaneously adopts a single temperature and pressure set of flowmeter to meter the casing gas, reduces the gas content of the output liquid and the influence of the gas on the working condition of a pump and the metering precision, and adopts the real-, the flow of three phases of oil, gas and water is calculated, and the metering precision is high.)

1. The utility model provides an oil well oil gas water three-phase flow metering device which characterized in that: comprises an intelligent controller (99), a bidirectional oil cylinder (41), a weighing sensor (43) and a base (91), the bidirectional oil cylinder (41) is connected with the base (91) through a weighing sensor (43), a pull rod type electronic ruler (51) is arranged on the side surface of the bidirectional oil cylinder (41), a cross beam (53) is fixedly connected to the upper end of a pull rod (52) of the electronic ruler (51), the cross beam (53) is fixedly connected with a piston rod of the bidirectional oil cylinder (41), thereby the pull rod (52) and the piston move synchronously, the other end of the beam (53) is provided with a permanent magnet (54), a lower limit Hall switch (55) and an upper limit Hall switch (56) are respectively arranged above the bidirectional oil cylinder (41) at the phase angle of the permanent magnet (54), the weighing sensor (43), the electronic ruler (51), the upper limit Hall switch (56) and the lower limit Hall switch (55) are respectively and electrically connected with the intelligent controller (99);

the lower part of the bidirectional oil cylinder (41) is provided with an A port communicated with the inside and the outside, the upper part of the bidirectional oil cylinder is provided with a B port communicated with the inside and the outside, the A port is connected with a wellhead oil inlet port (11) through a pipeline, an oil inlet control electromagnetic valve A (33) is arranged on the pipeline, the B port is connected with a wellhead oil inlet end through a pipeline, an oil inlet control electromagnetic valve B (31) is arranged on the pipeline, the A port is connected with a wellhead oil return port (12) through a pipeline, an oil return control electromagnetic valve A (34) is arranged on the pipeline, the B port is connected with a wellhead oil return port (12) through a pipeline, and an oil return control electromagnetic; the incoming oil control electromagnetic valve A (33), the incoming oil control electromagnetic valve B (31), the oil return control electromagnetic valve A (34) and the oil return control electromagnetic valve B (32) are respectively and electrically connected with an intelligent controller (99);

the port A is connected with a liquid level sensor A (82), the port B is connected with a liquid level sensor B (81), a cylinder body temperature sensor (73), a calibration liquid level sensor C (83) and an electric heating and heat preservation device (93) with temperature control are arranged outside the bidirectional oil cylinder (41), and the liquid level sensor A (82), the liquid level sensor B (81), the cylinder body temperature sensor (73), the calibration liquid level sensor C (83) and the electric heating and heat preservation device (93) are respectively and electrically connected with the intelligent controller (99);

an incoming oil pressure sensor (61) for testing incoming oil pressure is arranged on the upstream of the incoming oil control solenoid valve A (33) and the incoming oil control solenoid valve B (31), an incoming oil control stop valve (21) is arranged on the upstream of the incoming oil pressure sensor (61), an oil return temperature sensor (71) for testing oil return temperature and an oil return pressure sensor (62) for testing oil return pressure are sequentially arranged on the downstream of the oil return control solenoid valve A (34) and the oil return control solenoid valve B (32), and the incoming oil pressure sensor (61), the oil return pressure sensor (62) and the oil return temperature sensor (71) of the oil return control stop valve (24) are respectively and electrically connected with the intelligent controller (99) on the downstream of the oil return pressure sensor (62).

2. An oil well oil gas water three-phase flow metering device as claimed in claim 1, characterized in that: a safety valve (23) and an oil inlet bypass control stop valve (22) are arranged between the oil inlet port (11) and the oil return port (12) of the oil well.

3. An oil well oil gas water three-phase flow metering device as claimed in claim 1, characterized in that: the oil well gas-water separator is characterized by further comprising a sleeve gas inlet pipe (13), one end of the sleeve gas inlet pipe (13) is communicated with an oil well sleeve, the other end of the sleeve gas inlet pipe is communicated with a well head oil return port (12), a gas flowmeter (42), a sleeve gas control electromagnetic valve (35) and a one-way valve (25) which are integrated with a sleeve gas temperature sensor (72) and a sleeve gas pressure sensor (63) are arranged on the sleeve gas inlet pipe (13), and the gas flowmeter (42) and the sleeve gas control electromagnetic valve (35) are respectively electrically connected with the intelligent controller (99).

4. A method for measuring the oil-gas-water three-phase flow of an oil well by using the oil-gas-water three-phase flow measuring device of claim 1, which comprises the following steps:

s1, in an initial state, all control valves and electromagnetic valves are in a normally open state, and oil and gas coming from an oil inlet port (11) of a wellhead directly enter an oil return port (12) of the wellhead;

s2, the intelligent controller (99) is electrified and initialized, the casing gas control electromagnetic valve (35) is closed, the pressure and the temperature of the oil well casing are detected, if the casing pressure is larger than a set value, the casing gas control electromagnetic valve (35) is opened, the casing gas enters the wellhead oil return port (12), meanwhile, the gas flowmeter (42) measures gas flow data, and if not, the casing gas control electromagnetic valve (35) is closed, and the casing pressure is in the range of the set value;

s3, the intelligent controller (99) records the current time as t1 and the bottom number Q of the gas flowmeter (42)₁；

S4, an intelligent controller (99) opens an oil inlet control electromagnetic valve A (33) connected with an A port of a two-way oil cylinder (41) and an oil return control electromagnetic valve B (32) connected with a B port, closes an oil return control electromagnetic valve A (34) connected with the A port and an oil inlet control electromagnetic valve B (31) connected with the B port, incoming liquid enters the A port, a piston of the two-way oil cylinder (41) moves upwards along with the increase of yield, an electronic ruler (51) measures the position of the piston, and the intelligent controller (99) records data of all sensors in real time;

s5, as the oil well continuously produces gas and liquid, the piston of the bidirectional oil cylinder (41) continuously moves upwards, when the oil well reaches the top point, the upper limit Hall switch (56) gives a signal, the intelligent controller (99) records the time at the moment as t2, and the reading of the weighing sensor (43) is W₁The pressure of the hydraulic pressure sensor (61) is P_AThe electronic scale (51) has a reading of L_AThe liquid level value of the liquid level sensor A (82) is H_AThe liquid level value of the calibration liquid level sensor C (83) is H_SchoolThe pressure of the return oil pressure sensor (62) is P_BThe temperature value of the return oil temperature sensor (71) is T, and the bottom number Q of the gas flowmeter (42)₂；

S6, opening an oil inlet control electromagnetic valve B (31) connected with a port B of the bidirectional oil cylinder (41) and an oil return control electromagnetic valve A (34) connected with the port A, closing an oil return control electromagnetic valve B (32) connected with the port B and an oil inlet control electromagnetic valve A (33) connected with the port A, enabling produced liquid to enter the port B of the bidirectional oil cylinder (41), and enabling a piston to run downwards;

s7, setting the tare weight of the bidirectional oil cylinder (41) as W₀Radius r, actual value of calibrated level sensor C (83) H₀The density of the crude oil is rho, the length unit adopts meter (m), the weight unit adopts ton (t):

liquid level correction coefficient k ═ H₀/H_School

Volume of liquid: v_{Liquid for treating urinary tract infection}＝kπr² H_A

Weight of liquid: w ═ W₁-W₀

Because: w ═ V_{Liquid for treating urinary tract infection}-V_Oil)*1+V_Oil*ρ

Therefore: v_Oil＝(V_{Liquid for treating urinary tract infection}-W)/(1-ρ)

W_Oil＝V_Oil*ρ

W_{Water (W)}＝W-W_Oil

Water content of W_{Water (W)}/W*100％

The volume of gas is: v_{Qi (Qi)}＝πr²(L_A-kH_A)

The converted standard gas is: q is μ V_{Qi (Qi)}

Mu is natural gas at T temperature, P_AVolume factor under pressure;

instantaneous flow of the flowmeter: Δ t ═ t2-t1

Liquid Q ═ V_{Liquid for treating urinary tract infection}/Δt(m³/h)

Q liquid ton is W/delta t (t/h)

Q oil ═ V_Oil/Δt(m³/h)

Q oil ton ═ W_Oil/Δt(m³/h)

Qi (Q) being₂-Q₁+ Q mark)/Δ t (m)³/h)

Water content of Q ═ W_{Water (W)}/W*100％

Cumulative value of flowmeter:

the total liquid amount is as follows: vs + V_{Liquid for treating urinary tract infection}(m³)

Total liquid volume ton: ws as Ws + W (t)

Total water volume ton: w_{Water S}＝W_{Water S}+W_{Water (W)}(t)

Total oil mass ton: w_{Oil S}＝W_{Oil S}+W_Oil(t)

The total gas volume is as follows: v_{Gas S}＝V_{Gas S}+Q₂-Q₁+ Q mark (m)³)

S8, after switching to a lower stroke, gas and liquid produced by the oil well enter a port B of the two-way oil cylinder (41), the gas and liquid produced by the oil well enter an oil return pipeline from t1 to t2, and the volume of a piston rod needs to be subtracted in the lower stroke metering method, and the other methods are the same as the upper stroke metering method;

s9, the intelligent controller (99) can count the output of single stroke by recording the liquid level corresponding to each oil well stroke and the data of the electronic ruler (51), and accordingly, the working condition of the oil pumping unit can be analyzed and judged.

Technical Field

The invention belongs to the technical field of oil extraction in oil fields, and particularly relates to an oil well oil-gas-water three-phase flow metering device and a metering method.

Background

Oil well production metering is very important in the development, production and operational management of oil fields. The oil well yield measurement aims at knowing the oil production condition of a single well, so that the exploitation operation dynamics of an oil field is mastered, the change of the underground oil storage condition is analyzed, a reasonable development and adjustment scheme is formulated, and the improvement of the oil reservoir recovery ratio, the scientization of oil field management and the maximization of the development benefit are realized.

The single-well yield measurement relates to oil-gas-water three-phase flow, the technologies adopted by all the existing multiphase flow meters have great defects, the technologies which mainly adopt technologies such as gamma rays, microwaves and the like to measure each phase component in the multiphase flow for the non-separation multiphase flow measurement technology have safety problems, and no multiphase flow meter can accurately measure the multiphase flow under the conditions of all flow components and flow states from a large amount of test data analysis, and the reliability and the applicability are not ideal.

Only by accurately mastering various real-time data of the three-phase flow and timely adjusting the mining and transportation scheme can the mining and transportation cost be maximally reduced, and the safety of system operation is ensured to the greatest extent.

Therefore, it is a problem to be solved by those skilled in the art to design a novel oil-gas-water three-phase flow metering device and method with high metering accuracy, simple structure, small size, convenient installation and operation, low cost, and wide application range.

Disclosure of Invention

In order to solve the problems of low precision, complex structure and poor applicability of the existing oil-gas-water three-phase flow metering device, the oil-gas-water three-phase flow metering device for the oil well has the advantages of small volume, low manufacturing cost, strong applicability and high precision.

The technical scheme provided by the invention is as follows: an oil well oil gas water three-phase flow metering device comprises an intelligent controller, a two-way oil cylinder, a weighing sensor and a base, wherein the two-way oil cylinder is connected with the base through the weighing sensor, a pull rod type electronic ruler is arranged on the side surface of the two-way oil cylinder, a cross beam is fixedly connected to the upper end of a pull rod of the electronic ruler, the cross beam is fixedly connected with a piston rod of the two-way oil cylinder, so that the pull rod and a piston move synchronously, a permanent magnet is arranged at the other end of the cross beam, a lower limiting Hall switch and an upper limiting Hall switch are respectively arranged above the two-way oil cylinder at a phase angle where the permanent magnet is located, and the weighing sensor, the electronic ruler, the upper limiting Hall switch and the lower limiting Hall switch; the lower part of the bidirectional oil cylinder is provided with an opening A communicated with the inside and the outside, the upper part of the bidirectional oil cylinder is provided with an opening B communicated with the inside and the outside, the opening A is connected with a wellhead oil inlet port through a pipeline, an oil inlet control electromagnetic valve A is arranged on the pipeline, the opening B is connected with a wellhead oil inlet port through a pipeline, an oil inlet control electromagnetic valve B is arranged on the pipeline, the opening A is connected with a wellhead oil return port through a pipeline, an oil return control electromagnetic valve A is arranged on the pipeline, the opening B is connected with the wellhead oil return port through a pipeline, and an oil return control electromagnetic valve B is; the incoming oil control electromagnetic valve A, the incoming oil control electromagnetic valve B, the oil return control electromagnetic valve A and the oil return control electromagnetic valve B are respectively and electrically connected with the intelligent controller; the port A is connected with a liquid level sensor A, the port B is connected with a liquid level sensor B, a cylinder body temperature sensor, a calibration liquid level sensor C and an electric heating and heat insulation device with temperature control are arranged outside the bidirectional oil cylinder, and the liquid level sensor A, the liquid level sensor B, the cylinder body temperature sensor, the calibration liquid level sensor C and the electric heating and heat insulation device are respectively and electrically connected with the intelligent controller; an incoming oil pressure sensor for testing incoming oil pressure is arranged at the upstream of the incoming oil control solenoid valve A and the incoming oil control solenoid valve B, an incoming oil control stop valve is arranged at the upstream of the incoming oil pressure sensor, an oil return temperature sensor for testing oil return temperature and an oil return pressure sensor for testing oil return pressure are sequentially arranged at the downstream of the oil return control solenoid valve A and the oil return control solenoid valve B, and an oil return control stop valve is arranged at the downstream of the oil return pressure sensor.

The oil well is characterized in that a safety valve and an oil inlet bypass control stop valve are arranged between the oil inlet port and the oil return port of the oil well.

The metering device further comprises a sleeve incoming pipe, one end of the sleeve incoming pipe is communicated with the oil well sleeve, the other end of the sleeve incoming pipe is communicated with a wellhead oil return port, a gas flowmeter, a sleeve gas control electromagnetic valve and a one-way valve which integrate a sleeve gas temperature sensor and a sleeve gas pressure sensor are arranged on the sleeve incoming pipe, and the gas flowmeter and the sleeve gas control electromagnetic valve are respectively and electrically connected with the intelligent controller.

A metering method for measuring oil well oil gas water three-phase flow by adopting an oil well oil gas water three-phase flow metering device comprises the following steps:

s1, in an initial state, all control valves and electromagnetic valves are in a normally open state, and oil and gas coming from a wellhead oil inlet port directly enter a wellhead oil return port;

s2, the intelligent controller is electrified and initialized, the casing gas control electromagnetic valve is closed, the pressure and the temperature of the oil well casing are detected, if the casing gas pressure is larger than a set value, the casing gas control electromagnetic valve is opened, the casing gas enters a wellhead oil return port, meanwhile, the gas flow meter measures gas flow data, otherwise, the casing gas control electromagnetic valve is closed, and the casing pressure is in the range of the set value;

s3, the intelligent controller records the current time as t1 and the bottom number Q of the gas flowmeter₁；

S4, the intelligent controller opens an oil inlet control electromagnetic valve A connected with an opening A of the bidirectional oil cylinder and an oil return control electromagnetic valve B connected with an opening B, closes the oil return control electromagnetic valve A connected with the opening A and the oil inlet control electromagnetic valve B connected with the opening B, incoming liquid enters the opening A, the bidirectional oil cylinder piston moves upwards along with the increase of yield, the electronic ruler measures the position of the piston, and the intelligent controller records data of all sensors in real time;

s5, as the oil well continuously produces gas and liquid, the bidirectional oil cylinder piston continuously moves upwards, when the oil well reaches the top, the upper limit Hall switch gives a signal, and the intelligent controller records the time of the momentT2, and a load cell reading W₁The pressure of the hydraulic pressure sensor is P_AThe reading of the electronic ruler is L_AThe liquid level value of the liquid level sensor A is H_AThe liquid level value of the calibration liquid level sensor C is H_SchoolThe pressure of the oil return pressure sensor is P_BThe temperature value of the return oil temperature sensor is T, and the bottom number Q of the gas flowmeter₂；

S6, opening an oil inlet control electromagnetic valve B connected with a port B of the bidirectional oil cylinder and an oil return control electromagnetic valve A connected with a port A, closing the oil return control electromagnetic valve B connected with the port B and the oil inlet control electromagnetic valve A connected with the port A, enabling produced liquid to enter the port B of the bidirectional oil cylinder, and enabling the piston to run downwards;

s7, setting the tare weight of the bidirectional oil cylinder as W₀Radius r, actual value of calibrated level sensor C is H₀The density of the crude oil is rho, the length unit adopts meter (m), the weight unit adopts ton (t):

liquid level correction coefficient k ═ H₀/H_School

Volume of liquid: v_{Liquid for treating urinary tract infection}＝kπr² H_A

Weight of liquid: w ═ W₁-W₀

Because: w ═ V_{Liquid for treating urinary tract infection}-V_Oil)*1+V_Oil*ρ

Therefore: v_Oil＝(V_{Liquid for treating urinary tract infection}-W)/(1-ρ)

W_Oil＝V_Oil*ρ

W_{Water (W)}＝W-W_Oil

Water content of W_{Water (W)}/W*100％

The volume of gas is: v_{Qi (Qi)}＝πr²(L_A-kH_A)

The converted standard gas is: q is μ V_{Qi (Qi)}

Mu is natural gas at T temperature, P_AVolume factor under pressure;

instantaneous flow of the flowmeter: Δ t ═ t2-t1

Liquid Q ═ V_{Liquid for treating urinary tract infection}/Δt(m³/h)

Q liquid ton is W/delta t (t/h)

Q oil ═ V_Oil/Δt(m³/h)

Q oil ton ═ W_Oil/Δt(m³/h)

Qi (Q) being₂-Q₁+ Q mark)/Δ t (m)³/h)

Water content of Q ═ W_{Water (W)}/W*100％

Cumulative value of flowmeter:

the total liquid amount is as follows: vs + V_{Liquid for treating urinary tract infection}(m³)

Total liquid volume ton: ws as Ws + W (t)

Total water volume ton: w_{Water S}＝W_{Water S}+W_{Water (W)}(t)

Total oil mass ton: w_{Oil S}＝W_{Oil S}+W_Oil(t)

The total gas volume is as follows: v_{Gas S}＝V_{Gas S}+Q₂-Q₁+ Q mark (m)³)

S8, after switching to a lower stroke, gas and liquid produced by the oil well enter a port B of the two-way oil cylinder, the gas and liquid are produced at the moment from t1 to t2 and enter an oil return pipeline, and the volume of a piston rod needs to be reduced in the lower stroke metering method, and the other methods are the same as the upper stroke metering method;

and S9, the intelligent controller can count the output of a single stroke by recording the liquid level and the electronic scale data corresponding to the stroke of each oil well, and accordingly, the working condition of the oil pumping unit can be analyzed and judged.

The invention has the beneficial effects that: the oil-gas-water three-phase flow meter is arranged on an oil well mouth, can automatically meter the oil-well oil-gas-water three-phase flow on line, has simple structure, convenient installation and operation, low cost, safety and environmental protection, and has less influence factors and high metering precision because of adopting a weighing method for measurement.

Drawings

Fig. 1 is a schematic structural view of the present invention.

In the figure: 11. a wellhead oil inlet port; 12. a wellhead oil return port; 13. a cannula gas inlet tube; 21. the incoming oil controls the stop valve; 22. an incoming oil bypass control stop valve; 23. a safety valve; 24. an oil return control stop valve; 25. a one-way valve; 31. the incoming oil controls the electromagnetic valve B; 32. an oil return control electromagnetic valve B; 33. the incoming oil controls the electromagnetic valve A; 34. an oil return control solenoid valve A; 35. a casing gas control solenoid valve; 41. a bidirectional oil cylinder; 42. a gas flow meter; 43. a weighing sensor; 51. an electronic ruler; 52. a pull rod; 53. a cross beam; 54. a permanent magnet; 55. a lower limit Hall switch; 56. an upper limit Hall switch; 61. an incoming oil pressure sensor; 62. an oil return pressure sensor; 63. a casing gas pressure sensor; 71. an oil return temperature sensor; 72. a casing air temperature sensor; 73. a cylinder temperature sensor; 81. a liquid level sensor B; 82. a liquid level sensor A; 83. calibrating the liquid level sensor C; 91. a base; 92. an electric heating and heat preserving device; 99. an intelligent controller.

Detailed Description

In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments.

This embodiment includes intelligent control ware 99, two-way hydro-cylinder 41, weighing sensor 43 and base 91, two-way hydro-cylinder 41 pass through weighing sensor 43 and base 91 and connect, two-way hydro-cylinder 41 side be provided with pull rod formula electronic ruler 51, the rigid coupling of pull rod 52 upper end of electronic ruler 51 has crossbeam 53, crossbeam 53 with two-way hydro-cylinder 41's piston rod fixed connection to pull rod 52 and piston synchronous motion, the other end of crossbeam 53 set up permanent magnet 54, be provided with down spacing hall switch 55 and last spacing hall switch 56 respectively in the two-way hydro-cylinder 41 top of permanent magnet 54 place phase angle, weighing sensor 43, electronic ruler 51, last spacing hall switch 56 and lower spacing hall switch 55 respectively with intelligent control ware 99 electricity be connected.

The lower part of the bidirectional oil cylinder 41 is provided with an A port communicated with the inside and the outside, the upper part of the bidirectional oil cylinder is provided with a B port communicated with the inside and the outside, the A port is connected with a wellhead oil inlet port 11 through a pipeline, an oil inlet control electromagnetic valve A33 is arranged on the pipeline, the B port is connected with a wellhead oil inlet end through a pipeline, an oil inlet control electromagnetic valve B31 is arranged on the pipeline, the A port is connected with a wellhead oil return port 12 through a pipeline, an oil return control electromagnetic valve A34 is arranged on the pipeline, the B port is connected with a wellhead oil return port 12 through a pipeline, and an oil return control electromagnetic valve B32 is; the oil coming control electromagnetic valve A33, the oil coming control electromagnetic valve B31, the oil return control electromagnetic valve A34 and the oil return control electromagnetic valve B32 are respectively and electrically connected with the intelligent controller.

A mouth be connected with level sensor A82, the B mouth is connected with level sensor B81, two-way hydro-cylinder 41 outside be provided with cylinder body temperature sensor 73, calibration level sensor C83 and have temperature control's electrical heating heat preservation device 93, level sensor A82, level sensor B81, cylinder body temperature sensor 73, calibration level sensor C83 and electrical heating heat preservation device 93 respectively with intelligent control ware 99 electricity be connected.

An incoming oil pressure sensor 61 for testing incoming oil pressure is arranged upstream of the incoming oil control solenoid valve a33 and the incoming oil control solenoid valve B31, an incoming oil control stop valve 21 is arranged upstream of the incoming oil pressure sensor 61, an oil return temperature sensor 71 for testing oil return temperature and an oil return pressure sensor 62 for testing oil return pressure are arranged downstream of the oil return control solenoid valve a34 and the oil return control solenoid valve B32 in sequence, and the incoming oil pressure sensor 61, the oil return pressure sensor 62 and the oil return temperature sensor 71 of the oil return control stop valve 24 are arranged downstream of the oil return pressure sensor 62 and are respectively electrically connected with the intelligent controller 99.

The technical scheme is that a safety valve 23 and an oil inlet bypass control stop valve 22 are arranged between the oil inlet port 11 and the oil return port 12 of the oil well.

The further technical scheme is that the oil well gas recovery device further comprises a sleeve pipe incoming pipe 13, one end of the sleeve pipe incoming pipe 13 is communicated with an oil well sleeve, the other end of the sleeve pipe incoming pipe 13 is communicated with a well head oil return port 12, a sleeve pipe gas temperature sensor 72 and a sleeve pipe gas pressure sensor 63 are integrated into a gas flowmeter 42, a sleeve pipe gas control electromagnetic valve 35 and a one-way valve 25 are arranged on the sleeve pipe incoming pipe 13, and the gas flowmeter 42 and the sleeve pipe gas control electromagnetic valve 35 are respectively electrically connected with the intelligent controller 99.

In the invention, the length unit adopts meter (m), the weight unit adopts ton (t), and the initial value of the cumulative value is 0;

diameter of the bidirectional cylinder 41: d is 250mm 0.25m

Stroke of the bidirectional cylinder 41: s400 mm 0.4m

Diameter of a piston rod of the bidirectional oil cylinder 41: d is 32mm 0.032m

The tare weight of the device is as follows: w₀＝80.000Kg＝0.08t

Crude oil density: p 0.8900

The actual values for the calibrated level sensor C83 are: h₀＝D＝250mm＝0.25m

A metering method for measuring oil well oil gas water three-phase flow by adopting an oil well oil gas water three-phase flow metering device comprises the following steps:

s1, in the initial state, all control valves and electromagnetic valves are in the normally open state, and the incoming oil and the incoming gas directly enter the wellhead oil return port 12.

And S2, electrifying and initializing the intelligent controller 99, closing the casing gas control electromagnetic valve 35, detecting the pressure and temperature of the oil well casing, opening the casing gas control electromagnetic valve 35 if the casing pressure is greater than a set value, allowing the casing gas to enter the oil return pipe 12, measuring gas flow data by the gas flowmeter 42, and closing the casing gas control electromagnetic valve 35 if the casing pressure is not greater than the set value, so that the casing pressure is in a set range.

S3, the intelligent controller 99 records the current time as:

t1 is 12/1/2020/12: 00

Bottom of gas flowmeter 42: q₁＝0.000m³

S4, the intelligent controller 99 opens the oil inlet control electromagnetic valve A33 connected with the port A of the bidirectional oil cylinder 41 and the oil return control electromagnetic valve B32 connected with the port B, closes the oil return control electromagnetic valve A34 connected with the port A and the oil inlet control electromagnetic valve B31 connected with the port B, incoming liquid enters the port A, along with the increase of yield, the piston of the bidirectional oil cylinder 41 moves upwards, the electronic ruler 51 measures the position of the piston, and the intelligent controller 99 records the data of all sensors in real time.

S5, as the oil well continuously produces gas and liquid, the bidirectional oil cylinder 41 piston continuously moves upwards, when the top is reached, the upper limit Hall switch 56 gives a signal, and the intelligent controller 99 records the time of the moment as follows:

t2 is 12/1/01: 30/2020

The load cell 43 reads: w₁＝89.000(kg)＝0.089(t)

The pressure of the hydraulic pressure sensor 61 is: p_A＝1.000(MPa)

The electronic ruler 51 reads: l is_A＝399(mm)＝0.399(m)

The level value of the level sensor a82 is: h_A＝200(mm)＝0.2(m)

The level value of the calibrated level sensor C83 is: h_School＝255(mm)＝.255(m)

The pressure of the return pressure sensor 62 is: p_B＝0.400(MPa)

The temperature value of the return oil temperature sensor 71 is: t42.00 deg.C

Bottom of gas flowmeter 42: q₂＝0.200m³

S6, opening an oil inlet control electromagnetic valve B31 connected with the port B of the two-way oil cylinder 41 and an oil return control electromagnetic valve A34 connected with the port A, closing an oil return control electromagnetic valve B32 connected with the port B and an oil inlet control electromagnetic valve A33 connected with the port A, and enabling produced liquid to enter the two-way oil cylinder 41B and enable a port piston to run downwards.

S7, the calculation process is as follows:

liquid level correction factor: k is H₀/H_School＝250/255＝0.98039216

Volume of liquid: v_{Liquid for treating urinary tract infection}＝kπr² H_A＝250/255*3.1415926*0.25²/4*0.2＝0.009624977(m³)

Weight of liquid: w ═ W₁-W₀＝89-80＝9(Kg)

Because: w ═ V_{Liquid for treating urinary tract infection}-V_Oil)*1+V_Oil*ρ

Therefore: v_Oil＝(V_{Liquid for treating urinary tract infection}-W)/(1-ρ)＝(0.009624977-0.009)/(1-0.8900)＝0.00568161(m³)

W_Oil＝V_Oil*ρ＝0.00568161*0.89000＝0.0050566329(t)

W_{Water (W)}＝W-W_Oil＝0.009-0.0050566329＝0.0039433671(t)

Water content of W_{Water (W)}/W*100％＝0.0039433671/0.009*100％＝43.8152％

The volume of gas is:

V_{qi (Qi)}＝πr²(L_A-kH_A)＝3.1415926*(0.25*0.25/4)*(0.399-250/255*0.399)＝0.000384(m³)

Neglecting the temperature factor, the conversion into standard gas is: q is μ V_{Qi (Qi)}＝(P_A*10+1)*0.000384＝0.004224(m³)

Instantaneous flow of the flowmeter: Δ t ═ 0.025 (hr) (t2-t1) ═ 12:01:30-12:00:00 ═ 0.025 (hr)

Liquid Q ═ V_{Liquid for treating urinary tract infection}/Δt＝0.009624977/0.025＝0.384999(m³/h)

Q liquid ton (W/delta t) 0.009000/0.025 (t/h) 0.36

Q oil ═ V_Oil/Δt＝0.00568161/0.025＝0.227264(m³/h)

Q oil ton ═ W_Oil/Δt＝0.0050566329/0.025＝0.202265(m³/h)

Qi (Q) being₂-Q₁+ Q mark)/Δ t ═ 0.200-0.000+ 0.004224/0.025 ═ 8.16896 (m)³/h)

Water content of Q ═ W_{Water (W)}/W*100％＝43.8152％

Cumulative value of flowmeter:

the total liquid amount is as follows: vs + V_{Liquid for treating urinary tract infection}(m³)＝0+0.009624977＝0.009624977(m³)

Total liquid volume ton: ws + w (t) 0+0.009 ═ 0.009(t)

Total water volume ton: w_{Water S}＝W_{Water S}+W_{Water (W)}(m³)＝0+0.0039433671＝0.0039433671(t)

Total oil mass ton: w_{Oil S}＝W_{Oil S}+W_Oil(t)＝0+0.0050566329＝0.0050566329(t)

The total gas volume is as follows: v_{Gas S}＝V_{Gas S}+Q₂-Q₁+ Q mark (m)³)＝0.000+0.200-0.000+0.004224＝0.204224(m³)

And S8, after switching to the lower stroke, gas and liquid produced by the oil well enter the port 41B of the two-way oil cylinder, the gas and liquid produced by the oil well enter an oil return pipeline from t1 to t2, and the volume of the piston rod needs to be subtracted in the lower stroke metering method, which is the same as the upper stroke metering method.

S9, the intelligent controller 99 can count the output of single stroke by recording the liquid level corresponding to the stroke of each oil well and the data of the electronic ruler 51, and accordingly, the working condition of the oil pumping unit can be analyzed and judged.

Compared with the prior art, the invention has the advantages of simple structure, and convenient installation, operation and maintenance; secondly, the invention adopts a weighing method to meter the volume output liquid, adopts a volume method to meter the volume output gas and the water content, simultaneously, the casing gas is metered by a single flowmeter, thereby reducing the influence of the gas content and the gas of the output liquid on the pump working condition and the metering precision, arranging a correction liquid level sensor to calculate the oil-gas-water three-phase flow by real-time correction of liquid level measurement values under different temperature and pressure, and having high metering precision; the weighing and metering are adopted without radioactive and radioactive devices and equipment, so that the weighing and metering device is safe, environment-friendly and wide in application range; and finally, the sleeve gas is metered through the independent channel, so that the metering precision is ensured, the influence of the gas on the liquid metering precision and the pump working condition is avoided, and the working condition can be analyzed and judged by metering the yield of each stroke.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.