CN217001804U

CN217001804U - Medicine adding system

Info

Publication number: CN217001804U
Application number: CN202121516014.0U
Authority: CN
Inventors: 李晟贤; 张军生
Original assignee: Individual
Current assignee: Beijing Haobo Wanwei Technology Co ltd
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2022-07-19
Anticipated expiration: 2031-07-05

Abstract

The utility model discloses a dosing system, which comprises a container, a pump inlet pipe, a high-pressure pump, a pump outlet tee joint, a backflow pipe fitting, a backflow regulating valve, a backflow pipe, a medicine conveying pipe, a medicine distributing tee joint, a first medicine feeding pipe, a first regulating valve, a first metering pipe fitting, a first high-pressure micro flowmeter, a first medicine distributing pipe, a second medicine feeding pipe, a second regulating valve, a second metering pipe fitting and a second high-pressure micro flowmeter, wherein the pump inlet pipe is connected with the pump inlet pipe; the lower part of the container is communicated with one end of a pump inlet pipe, and the other end of the pump inlet pipe is communicated with an inlet of a high-pressure pump; the outlet of the high-pressure pump is communicated with one end of a pump outlet tee; the side interface of the pump outlet tee joint is communicated with the inlet of the backflow regulating valve by a backflow pipe fitting, and the other end of the pump outlet tee joint is communicated with one end of the medicine conveying pipe; the utility model can effectively solve the problems of metering, adjusting and controlling the dosing of the oil gas well and the pipeline, save energy, reduce consumption and meet the production requirement; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.

Description

Medicine adding system

Technical Field

The utility model relates to the field of dosing of oil wells, gas wells and pipelines, in particular to a dosing system. Can be applied to oil wells, gas wells and gas pipelines needing to be added with medicaments.

Background

For reducing the floor space or being convenient for construction management and the like, domestic oil wells and gas wells are usually arranged by cluster wells, namely: 2 or more than 2 oil and gas wells are drilled in the same well field, and the distance between adjacent Christmas trees and gas production trees is generally not more than 50 meters.

In order to ensure the normal production and operation of such oil and gas wells, functional chemical agents (collectively referred to as agents) which are liquid at normal temperature and normal pressure are generally added into a plurality of oil and gas wells at the same time.

Take a shale gas well in waffle in Sichuan as an example.

The gas field is located in mountainous and hilly areas, the land is scarce, and the construction cost of roads and well sites is high, so that 6-10 gas wells are generally drilled in the same well site, and the distance between gas production trees of 2 adjacent gas wells is generally not more than 20 meters.

Each gas well of the gas field needs to continuously add foam discharging agent into the air of the oil lantern ring so as to facilitate water drainage and gas production, and generally needs to continuously add defoaming agent into a ground pipeline (also called a gas production pipeline and a gas collection pipeline) at the outlet of each gas well so as to facilitate defoaming and gas-liquid separation (liquid separation for short).

Referring to the attached drawing 1, at present, 1 metering pump is used to fill the foam discharging agent for every 1 well of the gas field, and the process can be summarized as follows: the foam discharging agent in the foam discharging agent tank continuously enters an oil lantern ring of the gas well through a pump inlet pipe, a metering pump, a valve and a pump outlet pipeline and then flows to the bottom of the gas well; the foam discharging agent in the foam discharging agent tank continuously enters an oil lantern ring of the gas well through a pump inlet pipe, a metering pump, a valve and a pump outlet pipeline and then flows to the bottom of the gas well; the foam discharging agent in the foam discharging agent tank continuously enters an oil lantern ring of the gas well through a pump inlet pipe, a metering pump, a valve and a pump outlet pipeline and then flows to the bottom of the gas well.

Referring to the attached fig. 2, similarly, at present, 1 metering pump is independently used to fill defoaming agent in the surface pipeline of each 1 well of the gas field, and the process can be summarized as follows: the foam discharging agent in the foam discharging agent tank continuously enters a ground pipeline at the outlet of the gas well through a pump inlet pipe, a metering pump, a valve and a pump outlet pipeline; the foam discharging agent in the foam discharging agent tank continuously enters a ground pipeline at the outlet of the gas well through a pump inlet pipe, a metering pump, a valve and a pump outlet pipeline; the foam discharging agent in the foam discharging agent tank continuously enters a ground pipeline at the outlet of the gas well through a pump inlet pipe, a metering pump, a valve and a pump outlet pipeline.

The method has the following defects:

1. the method can not accurately measure, control or adjust the dosing flow, and often causes insufficient or uneven dosing flow, thereby influencing the production of gas wells.

It is known from the common general knowledge in the art that: the flow of the foam discharging agent added into the gas well is insufficient and uneven, which can cause unstable gas production of gas well water production and seriously affect the stable production of the gas well; the defoaming agent added into the gas well outlet ground pipeline has insufficient and uneven flow, which can cause the difficulty in liquid separation of the gas-liquid separator, and can cause water hammer failure, damage accidents and the like of a natural gas compressor behind the separator in serious cases. The foam discharging dosage added into the gas well is generally 2-10 liters per day of stock solution or 10-50 liters per day of diluent (namely, the stock solution is diluted by 5 times and added); according to the dilution of 10-50L/day, the dosing flow rate of the dilution is 0.42-2.08L/h; therefore, gas well production requires precise metering, control or regulation of dosing flow.

It is known from the common general knowledge in the art that: at present, when a metering pump is used for dosing in China, no public data and no successful precedent for metering dosing flow by using a flowmeter exist. The metering pump controls the stroke length of a plunger (or a diaphragm) by utilizing a cam mechanism so as to control the percentage of rated displacement (or theoretical displacement) of the metering pump, thereby achieving the purpose of controlling the displacement of the metering pump; if the rated displacement of the metering pump is 60 liters/hour, the displacement of the metering pump can be adjusted to 50 percent of the rated displacement by controlling the plunger stroke of the metering pump to be 50 percent of the maximum stroke by utilizing the cam mechanism, so that the displacement of the metering pump is adjusted to 30 liters/hour.

As is known in the art: the valve (such as an outlet valve ball valve seat) of the metering pump is inevitably seriously worn due to continuous reciprocating motion, the leakage quantity of the valve is increasingly large under a high-pressure state, and the leakage quantity can reach more than 80% of the rated discharge capacity of the metering pump when the valve is seriously leaked; therefore, after the metering pump continuously operates for a period of time (generally not more than 15 days), the dosing flow is difficult to accurately meter and control, so that the production requirement of the gas well is difficult to meet.

2. The manufacturing and purchasing of the high-pressure and small-displacement metering pump are extremely difficult.

As is known in the art: the pressure of the gas well injected foam scrubbing agent is generally up to 5-40 MPa; at present, metering pumps with rated pressure of 5-40 MPa and rated discharge capacity of less than 1 liter/hour are difficult to purchase in domestic and foreign markets; there is also no disclosure of a metering pump having a displacement of less than 1 liter/hour.

3. The method has low pump efficiency and high energy consumption.

As is known in the art: taking the dosing flow of 0.5 liter/hour as an example, because the high-pressure and small-displacement metering pumps are difficult to purchase, a metering pump with the rated displacement of 5 liters/hour is generally selected, and then the stroke of a cam mechanism control plunger (or a diaphragm) is reduced to 10 percent, so that the displacement is reduced to 10 percent of the rated displacement of 5 liters/hour, and the dosing flow is adjusted to 0.5 liter/hour; therefore, the pump efficiency is very low and the energy consumption is large.

4. When the method is applied to cluster wells, a plurality of metering pumps need to be operated, so that the process is complicated, and the management workload is large.

As is known in the art: generally, 6-10 gas wells are arranged and drilled in a shale cluster well in the Szechwan province, and for this purpose, 12-20 metering pumps need to be installed and operated, namely 2 metering pumps need to be installed and operated in 1 gas well; wherein, need to use 6 ~ 10 measuring pumps respectively for 6 ~ 10 gas wells fill the bubble to arrange the agent, need in addition to use 6 ~ 10 measuring pumps respectively for 6 ~ 10 gas wells fill the defoaming agent.

In a word, the medicine adding system and the method thereof have a plurality of defects when adding medicine to oil and gas wells and pipelines, and cannot meet production requirements.

SUMMERY OF THE UTILITY MODEL

The "agent" in the present invention: also called functional chemical agent, sometimes called medicine for short, is liquid at normal temperature and pressure.

The utility model comprises the following steps: is a general term for adding functional chemical agents. Sometimes it refers to the process of adding liquid chemical agent into oil and gas well and oil and gas pipeline.

The dosage in the utility model is as follows: for short, the drug amount; refers to the volume or weight of functional chemical added, and sometimes to the dosing flow rate.

The 'dosing flow rate' in the utility model: sometimes, the dosage and the dosage are abbreviated, and the dosage is the abbreviation of the addition flow of the functional chemical agent, and generally refers to the volume flow of the functional chemical agent.

"Christmas tree" in the present invention: when used in gas wells, are commonly referred to as gas production trees.

The first technical problem to be solved by the utility model is to provide a dosing system; the dosing system overcomes the defects of the existing dosing system, can effectively solve the problems of metering, adjusting and controlling dosing of oil and gas wells and pipelines, can save energy and reduce consumption, and can meet production requirements; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.

The utility model also provides a dosing method of the dosing system; the method overcomes the defects of the existing dosing method, can effectively solve the metering, adjusting and controlling problems of dosing of oil and gas wells and pipelines, can save energy, reduce consumption and meet production requirements; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.

In order to solve the first technical problem, a first technical solution adopted by the present invention is:

a dosing system comprises a container, a pump inlet pipe, a high-pressure pump, a pump outlet tee joint, a backflow pipe fitting, a backflow regulating valve, a backflow pipe, a medicine conveying pipe, a medicine distributing tee joint, a first medicine feeding pipe, a first regulating valve, a first metering pipe fitting, a first high-pressure micro-flowmeter, a first medicine distributing pipe, a second medicine feeding pipe, a second regulating valve, a second metering pipe fitting and a second high-pressure micro-flowmeter;

the lower part of the container is communicated with one end of a pump inlet pipe, and the other end of the pump inlet pipe is communicated with an inlet of a high-pressure pump;

the outlet of the high-pressure pump is communicated with one end of a pump outlet tee;

the side interface of the pump outlet tee joint is communicated with the inlet of the backflow regulating valve by a backflow pipe fitting, and the other end of the pump outlet tee joint is communicated with one end of the drug delivery pipe;

the outlet of the backflow regulating valve is communicated with the bottom of the container through a backflow pipe;

the other end of the medicine conveying pipe is communicated with one end of the medicine distributing tee;

the side interface of the medicine distributing tee is communicated with one end of a first medicine distributing pipe, and the other end of the medicine distributing tee is communicated with one end of a first medicine adding pipe;

the other end of the first dosing pipe is connected and communicated with a first high-pressure micro flowmeter sequentially through a first regulating valve and a first metering pipe fitting;

the other end of the first dispensing pipe is connected and communicated with a second high-pressure micro-flowmeter through a second dosing pipe, a second regulating valve and a second metering pipe in sequence.

As an embodiment of the present invention, the container may be any one of an atmospheric pressure container, a cubic container, a rectangular parallelepiped container, and a cylindrical container;

the high-pressure pump is any one of a centrifugal pump, a displacement pump, a rotor pump, a reciprocating pump, an electromagnetic pump, a gear pump, a metering pump and a diaphragm pump;

the high-pressure micro flowmeter is any one of a high-pressure gear flowmeter, an ultrasonic flowmeter, a high-pressure turbine flowmeter, a high-pressure metal pipe float flowmeter and a rotor flowmeter, and the measuring range is 5-60000 ml/hour;

the regulating valve is any one of a needle valve, a stop valve, a gate valve, an electric valve, an electromagnetic valve and an electric regulating valve;

the backflow regulating valve is any one of a needle valve, a stop valve, a gate valve, an electric valve, an electromagnetic valve and an electric regulating valve;

the pipe fitting can be selected from any one of metal pipe fittings;

the tee joint can be any one of metal tee joints;

the drug delivery pipe can be any one of a metal pipe, an aluminum plastic pipe, a steel plastic pipe, a high-pressure hose, a composite pipe and a pipe fitting;

the dosing pipe can be any one of a metal pipe, an aluminum-plastic pipe, a steel-plastic pipe, a high-pressure hose, a composite pipe and a pipe fitting;

the medicine distributing pipe can be any one of a metal pipe, an aluminum plastic pipe, a steel plastic pipe, a high-pressure hose, a composite pipe and a pipe fitting;

the pump inlet pipe can be selected from a pipeline or/and a pipeline made of conventional materials;

the return pipe can be selected from pipelines or/and pipelines made of conventional materials.

In order to prevent high-pressure natural gas or/and liquid in a gas well or a pipeline from impacting and damaging a high-pressure micro flow meter, a first check valve is arranged at the rear end of the first high-pressure micro flow meter, which is close to one end of the gas well, and an outlet of the first high-pressure micro flow meter is communicated with the first check valve through a first check pipe fitting; and a second check valve is arranged at one end, close to the gas well, behind the second high-pressure micro flow meter, and an outlet of the second high-pressure micro flow meter is connected and communicated with the second check valve through a second check pipe fitting.

In one embodiment of the present invention, in order to solve the problem that the gas well has no industrial power supply, the power supply of the high-voltage micro flow meter is any one of a dry battery, a storage battery, solar power generation and wind power generation or any combination of any two or more of the dry battery, the storage battery, the solar power generation and the wind power generation.

In order to solve the problem of unattended gas wells, the flow signal of the high-voltage micro flow meter is remotely transmitted to a remote place or/and a management area, and a power supply required by remote transmission of the flow signal is any one of a dry battery and a storage battery.

In one embodiment of the present invention, in order to solve the problem that the gas well has no industrial power source, the power supply mode of the high-pressure pump is any one of a solar power generation mode, a wind power generation mode, a storage battery power supply mode and a generator power generation mode or any combination of any two or more of the solar power generation mode, the wind power generation mode, the storage battery power supply mode and the generator power generation mode.

In order to solve the problem of unattended gas wells, the high-pressure pump is started and stopped at regular time by using a time relay.

In order to solve the problem of unattended gas wells, the high-pressure pump is started and stopped remotely by using a remote computer.

In order to solve the first technical problem, a second technical solution adopted by the present invention is:

a dosing system comprises a container, a pump inlet pipe, a high-pressure pump, a pump outlet tee joint, a backflow pipe fitting, a backflow regulating valve, a backflow pipe, a medicine conveying pipe, a medicine distributing tee joint, a first medicine feeding pipe, a first regulating valve, a first metering pipe fitting, a first high-pressure micro flow meter, a first medicine distributing pipe, a second medicine distributing tee joint, a second medicine feeding pipe, a second regulating valve, a second metering pipe fitting, a second high-pressure micro flow meter, a second medicine distributing pipe, a third medicine feeding pipe, a third regulating valve, a third metering pipe fitting and a third high-pressure micro flow meter;

the side interface of the pump outlet tee joint is communicated with the inlet of the backflow regulating valve by a backflow pipe fitting, and the other end of the pump outlet tee joint is communicated with one end of the medicine conveying pipe;

the other end of the first dosing pipe is connected and communicated with a first high-pressure micro-flowmeter through a first regulating valve and a first metering pipe in sequence;

the other end of the first medicine distribution pipe is communicated with one end of a second medicine distribution tee;

the side surface interface of the second medicine distributing tee joint is communicated with one end of a second medicine feeding pipe, and the other end of the second medicine distributing tee joint is communicated with one end of the second medicine distributing pipe;

the other end of the second dosing pipe is connected and communicated with a second high-pressure micro-flowmeter through a second regulating valve and a second metering pipe in sequence;

the other end of the second medicine distribution pipe is connected and communicated with a third high-pressure micro-flowmeter through a third medicine feeding pipe, a third regulating valve and a third metering pipe in sequence.

In order to prevent the high-pressure natural gas or/and liquid from back flowing and impacting and damaging the high-pressure micro flow meter, a first check valve is arranged at the back of the first high-pressure micro flow meter and close to one end of the gas well, and an outlet of the first high-pressure micro flow meter is communicated with the first check valve through a first check pipe fitting; a second check valve is arranged at one end, close to the gas well, behind the second high-pressure micro flow meter, and an outlet of the second high-pressure micro flow meter is communicated with the second check valve through a second check pipe fitting; and a third check valve is arranged at one end, close to the gas well, behind the third high-pressure micro flow meter, and the outlet of the third high-pressure micro flow meter is communicated with the third check valve through a third check pipe fitting.

In order to solve the first technical problem, a third technical solution adopted by the present invention is:

a dosing system comprises a container, a pump inlet pipe, a high-pressure pump, a tee joint, a pipe fitting, a backflow regulating valve, a backflow pipe, a drug delivery pipe, a regulating valve, a pipe fitting and a high-pressure micro-flowmeter;

the outlet of the high-pressure pump is communicated with one end of the tee joint;

the side interface of the tee joint is communicated with the inlet of the reflux regulating valve by a pipe fitting, and the other end of the tee joint is communicated with one end of the medicine conveying pipe;

the other end of the medicine conveying pipe is connected and communicated with the high-pressure micro-flowmeter through the regulating valve and the pipe fitting in sequence.

In order to prevent the backflow impact and damage of the high-pressure micro flow meter of the high-pressure natural gas or/and liquid, a check valve is arranged at the rear end of the high-pressure micro flow meter, close to one end of the gas well, and the outlet of the high-pressure micro flow meter is communicated with the check valve through a pipe fitting.

The first technical scheme adopted by the dosing method of the dosing system is as follows: the dosing method for the dosing system to inject the foam discharging agent into the 2-hole gas well comprises the following steps:

1) and connecting and communicating the outlet of the first check valve with a first sleeve valve of a first gas well by using a first connecting pipe fitting, and connecting and communicating the outlet of the second check valve with a second sleeve valve of a second gas well by using a second connecting pipe fitting.

2) The first regulating valve and the second regulating valve are opened first, and then the first sleeve valve and the second sleeve valve are opened.

3) The reflux adjustment valve was opened.

4) The high pressure pump is started.

5) And gradually reducing the opening degree of the backflow regulating valve so as to enable the instantaneous dosing flow rate of the first high-pressure micro flow meter or/and the second high-pressure micro flow meter to be larger than or equal to the dosing flow rate required by the first gas well or/and the second gas well.

6) And adjusting the opening degree of the first regulating valve according to the instantaneous flow reading of the first high-pressure micro flowmeter until the instantaneous flow reading of the first high-pressure micro flowmeter meets the dosing flow requirement required by the first gas well.

7) And adjusting the opening degree of the second regulating valve or/and the backflow regulating valve according to the instantaneous flow reading of the second high-pressure micro flowmeter until the instantaneous flow reading of the second high-pressure micro flowmeter meets the dosing flow requirement required by the second gas well.

In order to solve the problem of filling the foam discharging agent into 4-50 gas wells, the dosing system is used for filling the foam discharging agent into any number of gas wells in the 4-50 gas wells.

In order to solve the problem of adding functional chemical agents into 1-50 gas wells, the chemical adding system is used for adding any one or a mixture of any two or more of corrosion inhibitors, bactericides, scale inhibitors and corrosion and scale inhibitors into any number of gas wells in 1-50 gas wells.

In order to solve the problem of injecting a functional chemical agent into 1-50 oil wells or/and water injection wells, the chemical adding system is used for injecting any one of a corrosion inhibitor, a scale inhibitor, a bactericide, a viscosity reducer, a paraffin remover, a pour point depressant, an emulsifier, a foaming agent, an oil displacement agent and a drag reducer or a mixture of any two of the corrosion inhibitor, the scale inhibitor, the bactericide, the viscosity reducer, the paraffin remover, the pour point reducer, the emulsifier, the foaming agent, the oil displacement agent and the drag reducer into any number of oil wells or/and water injection wells of 1-50 oil wells or/and water injection wells in any proportion.

The second technical scheme adopted by the dosing method of the dosing system is as follows: the dosing method for the dosing system to inject the foam discharging agent into the 3 gas wells comprises the following steps:

1) and connecting and communicating the outlet of the first check valve with a first sleeve valve of a first gas well by using a first connecting pipe fitting, connecting and communicating the outlet of the second check valve with a second sleeve valve of a second gas well by using a second connecting pipe fitting, and connecting and communicating the outlet of the third check valve with a third sleeve valve of a third gas well by using a third connecting pipe fitting.

2) The first regulating valve, the second regulating valve and the third regulating valve are opened firstly, and then the first sleeve valve, the second sleeve valve and the third sleeve valve are opened.

3) The reflux regulating valve is opened.

4) The high pressure pump is started.

5) And gradually closing the opening degree of the backflow regulating valve so as to enable the instantaneous dosing flow of the first high-pressure micro flow meter or/and the second high-pressure micro flow meter or/and the third high-pressure micro flow meter to be larger than or equal to the dosing flow required by the first gas well or/and the second gas well or/and the third gas well.

8) And adjusting the opening degree of the third regulating valve or/and the backflow regulating valve according to the instantaneous flow reading of the third high-pressure micro flowmeter until the instantaneous flow reading of the third high-pressure micro flowmeter meets the dosing flow requirement required by the third gas well.

In order to solve the problem of filling the foam discharging agent into 4-50 gas wells, the dosing system is used for filling the foam discharging agent into any number of gas wells from 4-50 gas wells.

As an implementation mode of the utility model, in order to solve the problem of adding functional chemical agents such as corrosion inhibitors, bactericides, scale inhibitors, corrosion and scale inhibitors and the like into 1-50 gas wells, the chemical adding system is used for adding any one of the corrosion inhibitors, the bactericides, the scale inhibitors and the corrosion and scale inhibitors or a mixture of any two or more of the corrosion inhibitors, the bactericides, the scale inhibitors and the corrosion and scale inhibitors into any number of the 1-50 gas wells.

In order to solve the problem of injecting a functional chemical agent into 1-50 oil wells or/and water injection wells, the chemical adding system is used for injecting any one or a mixture of any two or more of a corrosion inhibitor, a scale inhibitor, a bactericide, a viscosity reducer, a paraffin remover, a pour point depressant, an emulsifier, a foaming agent, an oil displacement agent and a drag reducer into any number of oil wells or/and water injection wells in 1-50 oil wells or/and water injection wells.

In order to solve the second technical problem, a third technical scheme adopted by the dosing method of the dosing system of the utility model is as follows: the dosing method for the dosing system to inject, foam and discharge the agent into the 1 gas well comprises the following steps:

1) and connecting and communicating the outlet of the check valve with a casing valve of the gas well by using a connecting pipe fitting.

2) The regulating valve is opened first and then the sleeve valve is opened.

3) The reflux adjustment valve was opened.

4) The high pressure pump is activated.

5) And adjusting the opening of the regulating valve or/and the backflow regulating valve until the instantaneous dosing flow reading of the high-pressure micro flowmeter meets the dosing flow requirement required by the gas well.

The fourth technical scheme adopted by the dosing method of the dosing system is as follows: the dosing method for the dosing system to fill the defoaming agent into the ground pipeline of the 2-hole gas well comprises the following steps:

1) a first valve is provided on a first surface line of a first gas well and a second valve is provided on a second surface line of a second gas well.

2) The first check valve outlet is connected and communicated with the first valve by a first connecting pipe fitting, and the second check valve outlet is connected and communicated with the second valve by a second connecting pipe fitting.

3) The first regulating valve and the second regulating valve are opened firstly, and then the first valve and the second valve are opened.

4) The reflux adjustment valve was opened.

5) The high pressure pump is activated.

6) And gradually reducing the opening degree of the backflow regulating valve so as to enable the instantaneous dosing flow rate of the first high-pressure micro flow meter or/and the second high-pressure micro flow meter to be larger than or equal to the dosing flow rate required by the first gas well or/and the second gas well.

7) And adjusting the opening degree of the first regulating valve according to the instantaneous flow reading of the first high-pressure micro flowmeter until the instantaneous flow reading of the first high-pressure micro flowmeter meets the dosing flow requirement required by the first gas well.

8) And adjusting the opening degree of the second regulating valve or/and the backflow regulating valve according to the instantaneous flow reading of the second high-pressure micro flowmeter until the instantaneous flow reading of the second high-pressure micro flowmeter meets the dosing flow requirement required by the second gas well.

As an embodiment of the utility model, in order to solve the problem of adding the defoaming agent into 4-50 gas production pipelines, the dosing system is used for adding the defoaming agent into any number of 4-50 gas production pipelines.

As an implementation mode of the utility model, in order to solve the problem of adding functional chemical agents into 4-50 gas production pipelines, the chemical adding system is used for adding any one or a mixture of any two or more of a corrosion inhibitor, a bactericide, a scale inhibitor and a corrosion and scale inhibitor into any number of 4-50 gas production pipelines.

As an embodiment of the present invention, in order to solve the problem of filling functional chemical agents into 1 to 50 gas injection pipelines, the chemical feeding system is configured to fill any one of antifreeze, blocking remover, prevention and control agent, hydrate inhibitor, antifreeze blocking remover, corrosion inhibitor, scale inhibitor, cleaning agent, and functional chemical agent or a mixture of any two or more of them in any proportion into any number of 1 to 50 gas injection pipelines.

As an embodiment of the utility model, in order to solve the problem of filling functional chemical agents into 1-50 oil production lines or/and water injection pipelines, the chemical adding system is used for filling any one or a mixture of any two or more of any proportion of corrosion inhibitor, scale inhibitor, bactericide, viscosity reducer, paraffin remover, pour point depressant, emulsifier, foaming agent, oil displacement agent and drag reducer into any number of oil production lines or/and water injection pipelines in 1-50 oil production lines or/and water injection pipelines.

The fifth technical scheme adopted by the dosing method of the dosing system is as follows: the dosing method for the dosing system to fill the defoaming agent into the 3-hole gas well ground pipelines comprises the following steps:

1) a first valve is arranged on a first ground pipeline of a first gas well, a second valve is arranged on a second ground pipeline of a second gas well, and a third valve is arranged on a third ground pipeline of a third gas well.

2) The first connecting pipe connects and communicates the first check valve outlet with the first valve, the second connecting pipe connects and communicates the second check valve outlet with the second valve, and the third connecting pipe connects and communicates the third check valve outlet with the third valve.

3) The first regulating valve, the second regulating valve and the third regulating valve are opened firstly, and then the first valve, the second valve and the third valve are opened.

4) The reflux adjustment valve was opened.

5) The high pressure pump is activated.

6) And gradually closing the opening degree of the backflow regulating valve so as to enable the instantaneous dosing flow of the first high-pressure micro flow meter or/and the second high-pressure micro flow meter or/and the third high-pressure micro flow meter to be larger than or equal to the dosing flow required by the first gas well or/and the second gas well or/and the third gas well.

9) And adjusting the opening degree of the third regulating valve or/and the backflow regulating valve according to the instantaneous flow reading of the third high-pressure micro flowmeter until the instantaneous flow reading of the third high-pressure micro flowmeter meets the dosing flow requirement required by the third gas well.

In order to solve the problem of filling the defoaming agent into 4-50 gas production pipelines, the dosing system is used for filling the defoaming agent into any number of 4-50 gas production pipelines.

As an implementation mode of the utility model, in order to solve the problem of filling functional chemical agents into 1-50 gas injection pipelines, the dosing system is used for filling any one of antifreeze, blockage removal agent, prevention and control agent, hydrate inhibitor, antifreeze blockage removal agent, corrosion inhibitor, scale inhibitor, cleaning agent and functional chemical agent or a mixture of any two or more of the antifreeze, blockage removal agent, scale inhibitor, cleaning agent and functional chemical agent into any number of 1-50 gas injection pipelines.

The sixth technical scheme adopted by the dosing method of the dosing system is as follows: the dosing method for filling the defoaming agent into the ground pipeline of the 1 gas well by the dosing system comprises the following steps:

1) a valve is arranged on a ground pipeline of the gas well,

2) the outlet of the check valve is communicated with the valve by a connecting pipe fitting.

3) The regulating valve is opened first and then the valve is opened.

4) The reflux adjustment valve was opened.

5) The high pressure pump is started.

6) And adjusting the opening of the regulating valve or/and the backflow regulating valve until the instantaneous dosing flow reading of the high-pressure micro flowmeter meets the dosing flow requirement required by the gas well ground pipeline.

As an embodiment of the utility model, in order to solve the problem of filling functional chemical agents into 1-50 oil production lines or/and water injection lines, the chemical adding system is used for filling any one of corrosion inhibitors, scale inhibitors, bactericides, viscosity reducers, paraffin inhibitors, paraffin removing and preventing agents, pour point depressants, emulsifiers, foaming agents, oil displacement agents and drag reducers or a mixture of any two of the above in any proportion into any number of oil production lines or/and water injection lines in 1-50 oil production lines or/and water injection lines.

The utility model has the following beneficial effects: the utility model overcomes the defects of the existing dosing system, can effectively solve the metering, adjusting and controlling problems of dosing of oil and gas wells and pipelines, can save energy and reduce consumption, and can meet the production requirements; the method has the advantages of easy implementation, safety, reliability, wide application, easy popularization and the like.

Drawings

The following detailed description of embodiments of the utility model is provided in connection with the accompanying drawings

FIG. 1 is a schematic diagram of a prior art gas well foam injection and drainage system;

FIG. 2 is a schematic diagram of a prior art gas well flooding defoamer system;

FIG. 3 is a schematic view of the dosing system of example 1;

FIG. 4 is a schematic view of the dosing system of the comparative production test in example 1;

FIG. 5 is a schematic view of the dosing system of example 2;

FIG. 6 is a schematic view of the dosing system of example 4;

FIG. 7 is a schematic view of the dosing system of example 6;

FIG. 8 is a schematic view of the production test comparative example dosing system in example 6;

FIG. 9 is a schematic view of the dosing system of example 7;

FIG. 10 is a schematic view of the drug administration system of example 8;

FIG. 11 is a schematic view of the dosing system of example 14 for dosing the foam discharging agent into the 2-well;

FIG. 12 is a schematic view of the dosing system of example 15 used to add foam-discharging agent to a 3-well gas well;

FIG. 13 is a schematic view of the dosing system of example 16 used to add foam-discharging agent to a 1-well gas well;

FIG. 14 is a schematic view showing the dosing system of example 17 filling 2 gas well surface pipelines with defoaming agent;

FIG. 15 is a schematic view of the dosing system of example 18 dosing a defoaming agent into a surface pipeline of 3 wells;

FIG. 16 is a schematic view of the dosing system of example 19 dosing a defoaming agent to a surface pipeline of 1 gas well.

Detailed Description

Example 1

Referring to fig. 3, a dosing system includes a container 300, a pump inlet pipe 301, a high pressure pump 302, a pump outlet tee 303, a backflow pipe 304, a backflow regulating valve 305, a backflow pipe 306, a drug delivery pipe 307, a drug dispensing tee 308, a first drug adding pipe 309, a first regulating valve 310, a first metering pipe 311, a first high pressure micro flow meter 312, a first drug dispensing pipe 313, a second drug adding pipe 314, a second regulating valve 315, a second metering pipe 316, and a second high pressure micro flow meter 317;

the lower part of the container 300 is communicated with one end of a pump inlet pipe 301, and the other end of the pump inlet pipe 301 is communicated with an inlet of a high-pressure pump 302;

an outlet of the high-pressure pump 302 is communicated with one end of a pump outlet tee 303;

the side interface of the pump outlet tee 303 is communicated with the inlet of a backflow regulating valve 305 through a backflow pipe fitting 304, and the other end of the pump outlet tee 303 is communicated with one end of a drug delivery pipe 307;

the outlet of the backflow regulating valve 305 is communicated with the bottom of the container 300 through a backflow pipe 306;

the other end of the medicine conveying pipe 307 is communicated with one end of a medicine distributing tee 308;

the side interface of the medicine distributing tee 308 is communicated with one end of a first medicine distributing pipe 313, and the other end of the medicine distributing tee is communicated with one end of a first medicine adding pipe 309;

the other end of the first dosing pipe 309 is connected and communicated with a first high-pressure micro flowmeter 312 through a first regulating valve 310 and a first metering pipe 311 in sequence;

the other end of the first dispensing pipe 313 is connected and communicated with a second high-pressure micro-flowmeter 317 through a second dosing pipe 314, a second regulating valve 315 and a second metering pipe 316 in sequence.

Production test example of the present example:

take the Wio 202H82 shale gas platform of Wiwa in Sichuan as an example.

The platform is provided with 6 gas wells, the casing pressure of a single well can reach 15MPa, the dosing amount of a single well foam discharging agent and a defoaming agent is 5-8 liters per day of stock solution or 20-32 liters per day of diluent (namely, the stock solution is diluted by 4 times and injected), and the dosing flow of the diluent is 0.8-1.3 liters per hour; if 1 metering pump is used for filling the foam discharging agent and the other metering pump is used for filling the foam discharging agent for 1 gas well respectively, 12 metering pumps need to be installed and operated on the platform, and the platform is inevitably complicated in equipment, complex in process and large in management workload.

Known from the knowledge in the art: at present, a metering pump with the rated pressure of 20MPa can be purchased in the domestic market, the minimum adjustable rated discharge capacity is 0.5-5 liters/hour (the corresponding plunger stroke is 10-100%), and the rated power is 0.37 KW.

Therefore, if 1 well of the platform uses 2 metering pumps to respectively fill the foam discharging agent and the defoaming agent, the stroke of the plunger of the metering pump needs to be controlled at 16%, so that the control difficulty is high, the pump efficiency is low, and the electric energy waste is large.

As is known in the art: the metering pump is provided with a plunger stroke control turntable which is marked with plunger stroke percentage, and the lowest division value is 1 percent; the plunger stroke percentage of the corresponding division value can be controlled by rotating the turntable; because the outlet valve leakage of the metering pump and the plunger stroke length are not in a linear relationship, the plunger stroke percentage and the displacement percentage of the metering pump are not in a one-to-one corresponding relationship and are not in a linear and equal ratio relationship; that is, after the scale value of the rotary table is adjusted to 16%, the plunger stroke of the metering pump is only adjusted to 16% of the total stroke, and the displacement of the metering pump is not adjusted to 16% of the rated displacement (at this time, the actual displacement of the metering pump may be greater than 16% of the rated displacement, or may be less than 16% of the rated displacement, and the error may exceed 30%, and the smaller the stroke percentage of the plunger, the larger the error is); therefore, the displacement of the metering pump cannot be accurately adjusted by adjusting the plunger stroke percentage of the rotary table; especially, the difference between the valve leakage amount of a metering pump which runs for a period of time and the factory calibration value is huge, and the discharge capacity of the metering pump cannot be effectively metered and adjusted by using a method for adjusting the plunger stroke percentage to control the turntable.

In order to solve the problems, the platform is applied to a production test from 6 months and 1 day of 2021, and the technical scheme is as follows:

(1) when the foam discharging agent is injected, 1 metering pump with the maximum rated discharge capacity of 15 liters/hour and the rated pressure of 20MPa is used for increasing the pressure of the foam discharging agent to exceed the highest casing pressure of 6 wells; then the foam discharging agent enters a dosing manifold; then the foam discharging agent respectively enters 6 dosing pipelines connected with 6 gas well oil sleeve annuluses. When the dosing flow of the foam discharging agent needs to be adjusted, an operator reads the flow (digitally displays) displayed by a high-pressure micro flow meter (with the flow range of 0.06-24L/h) on a dosing pipeline; a needle valve or a metering pump plunger travel control mechanism arranged on the dosing pipeline and a backflow regulating valve arranged at the outlet of the metering pump are regulated; the dosing flow of the foam discharging agent of each well can be adjusted to the required flow.

(2) Similarly, when the defoaming agent is added, 1 metering pump with the maximum rated discharge capacity of 15 liters/hour and the rated pressure of 20MPa is used for increasing the pressure of the defoaming agent to exceed the highest pressure (also called back pressure or oil pressure) of a ground gas production line of 6 wells; then leading the defoaming agent to enter a dosing manifold; then the foam discharging agent respectively enters 6 dosing pipelines connected with the ground gas production pipeline of 6 gas wells. When the dosing flow of the defoaming agent needs to be adjusted, an operator reads the flow (digitally displays) according to the flow displayed by the high-pressure micro flow meter on the dosing pipeline; a needle valve or a metering pump plunger stroke control mechanism arranged on the dosing pipeline and a backflow regulating valve arranged at the outlet of the metering pump are regulated; the dosing flow of the defoaming agent of each well can be adjusted to the required flow.

The production operation result of the platform after the technical scheme is applied shows that:

(1) 2 adopted metering pumps completely meet the production requirements of simultaneously filling the foam discharging agent and the defoaming agent into 6 wells: the foam discharging agent can be simultaneously injected into 6 gas wells by using 1 metering pump, 6 dosing pipelines, 6 high-pressure micro flowmeters and 1 metering pump outlet backflow regulating valve; similarly, 1 metering pump, 6 dosing pipelines, 6 high-pressure micro flowmeters and 1 metering pump outlet backflow regulating valve can simultaneously inject the defoaming agent into 6 gas wells.

(2) The adopted high-pressure micro flow meter resists pressure of 40MPa, has a flow range of 0.06-24L/h, and completely meets the production requirements of the platform foam discharging agent and the defoaming agent diluent on the dosage flow of 0.8-1.3L/h; the instantaneous dosing flow and the accumulated dosing flow of each gas well can be accurately displayed, remotely transmitted and read in a digital display mode, and the error of the estimated displacement value of the metering pump (which can be up to more than 30%) obtained by depending on the percentage of the stroke of the plunger of the metering pump to control the turntable can be effectively corrected.

Known from the knowledge in the art: at present, no public data or successful precedent of using a flowmeter at the outlet of a metering pump or/and a gas well dosing pipeline is available, and no public data or successful precedent of using a high-pressure micro flowmeter with the pressure resistance of 40MPa and the flow range of 0.06-24L/h is available.

(3) When the foam discharging agent or the defoaming agent is added, the adopted metering pump backflow regulating valve has a very prominent beneficial regulating effect: when the number of gas wells is 2 or more than 2, the dosing flow among the dosing pipelines seriously affects each other, and the influence is more serious when the number of the gas wells is more; that is, when the dosing flow of one of the dosing pipelines is adjusted, the dosing flows of the other dosing pipelines can be automatically changed, so that the dosing amounts of the other dosing pipelines cannot meet the production requirement of the gas well; therefore, when the number of gas wells is 2 or more than 2, the chemical adding amount of each well cannot be adjusted to the required chemical adding flow rate only by the needle valve, the plunger stroke control rotary disc of the metering pump and the high-pressure micro flow meter; however, after the opening degree of a backflow regulating valve (or a needle valve) at the outlet of the metering pump is properly regulated, the needle valve and the plunger stroke control turntable of the metering pump are used, and the dosing amount of each well can be accurately regulated to the required dosing flow according to the reading of the high-pressure micro flow meter.

(4) The metering pump backflow regulating valve used has another very prominent beneficial regulating function: because the dosage required by the gas well is only 0.8-1.3L/h, a proper high-pressure and small-displacement metering pump is difficult to purchase in the domestic market at present, if the backflow regulation is used, the metering pump with larger displacement can be used (purchased) to dose the medicine for 1 gas well, and the actual requirement of gradual production of a plurality of gas wells in a cluster well site can be met.

Taking the 202H82 shale gas platform as an example, the 6 wells of the platform are put into production gradually in multiple days, not at the same time in a moment; the platform initially charges 1 well, and then gradually increases to 6 wells; therefore, if a backflow regulating valve is not arranged at the outlet of the pump, the technical scheme that 1 metering pump with rated discharge capacity of 15 liters/hour (the minimum discharge capacity is inevitably not lower than 1.5 liters/hour and far exceeds the maximum dosing flow of a single well) and rated pressure of 20MPa is used for filling the foam discharging agent for 6 wells cannot be implemented in the actual production of the platform or causes great agent waste.

(5) The rated power of 1 metering pump with the maximum rated discharge capacity of 15 liters/hour and the rated pressure of 20MPa is 0.75KW, and the sum of the rated power of 2 metering pumps is 1.5 KW; compared with the technical scheme that 12 metering pumps (the single rated power is 0.37KW, and the total rated power is 4.44KW) with the maximum rated displacement of 5 liters/hour and the rated pressure of 20MPa are adopted, the power can be saved by 2.94KW, namely the power saving efficiency of a gas well dosing system is up to more than 66%; therefore, the technical scheme of the utility model has extremely remarkable electricity-saving effect.

Production test of this example comparative example:

as shown in fig. 4, in order to solve the problem of freezing and blocking of 2 to 50 natural gas high-pressure gas injection pipelines of the gas distribution valve bank for the northeast gas field, the applicant of the present invention has performed a production test of simultaneously filling 2 to 10 gas injection pipelines with 1 metering pump in the gas distribution valve bank for the northeast gas field in 12 months to 2020 months in 2019 and 4 months; taking a production test that 1 metering pump simultaneously fills the prevention and control agent into 2 gas injection pipes as an example, the technical scheme of the production test can be briefly described as follows:

(1) in order to prevent the natural gas from forming hydrate blockage in the gas injection pipeline 406 and the gas injection pipeline 409, 1 metering pump 402 with the maximum rated displacement of 60 liters/hour and the rated pressure of 20MPa is used for respectively filling the gas injection pipeline 406 and the gas injection pipeline 409 with the prevention and control agent to prevent freeze blockage, and the instantaneous flow of the filling prevention and control agent is adjusted according to the constantly changing gas injection quantity of the gas injection pipeline 406 and the gas injection pipeline 409 and different freeze-proof blockage removal requirements.

(2) The process flow of adding the prevention and control agent can be further briefly described as follows: the prevention and control agent in the prevention and control agent storage tank 400 enters a metering pump 402 at an instantaneous flow rate of 30-60 liters per day (or 1.25-2.5 liters per hour) through a pump inlet pipeline 401, and then the prevention and control agent at 30-60 liters per day (or 1.25-2.5 liters per hour) is distributed to a dosing pipe 405 and a dosing pipe 408 through a junction pipe 403; and according to the freezing blockage (or back pressure rise and fluctuation) conditions of the gas injection pipeline 406 and the gas injection pipeline 409, the needle valve 404 is used for controlling and adjusting the filling flow of the preventive and control agent of the dosing pipe 405, and the valve 407 is used for controlling and adjusting the filling flow of the preventive and control agent of the dosing pipe 408.

The result of the production test shows that the technical scheme has the following important defects:

(1) the instantaneous displacement of the metering pump 402 (namely, the instantaneous total flow of the prevention and control agent of the manifold 403) is adjusted and estimated by using a plunger stroke control turntable of the metering pump 402, and the error of the actual instantaneous dosing flow obtained by measuring the liquid level of the prevention and control agent storage tank 400 is up to 15-30%.

(2) Because the adopted prevention and control agent storage tank 400 is a square tank with the effective volume of 1 square and the cross section area of 1 square meter, the 1-hour tank position drop value corresponding to the dosing flow of 30-60 liters/day is only 3-6 centimeters; thus, the instantaneous displacement of the primary metering pump 402 is accurately adjusted, requiring a minimum of tens of hours.

(3) The instantaneous discharge capacity of the instant metering pump can be accurately confirmed, and the operator still cannot determine the respective instantaneous flow rates of the control agents in the dosing pipe 405 and the dosing pipe 408 in actual operation, so that the needle valve 404 cannot be used for controlling and adjusting the filling flow rate of the control agents in the dosing pipe 405 and the valve 407 cannot be used for controlling and adjusting the filling flow rate of the control agents in the dosing pipe 408; and further cannot control and adjust the instantaneous flow of the prevention and control agent required by the anti-freezing and blockage removal of the gas injection pipeline 406 and the gas injection pipeline 409.

(4) The operator can only estimate the instantaneous flow of the prevention and control agent entering the gas injection pipeline 406 and the gas injection pipeline 409 by means of personal subjective assumption or visual inspection of the valve rod strokes of the valve 404 and the valve 407 and by means of personal experience trainings, and can not judge and confirm the actual instantaneous flow and the bias flow degree of the prevention and control agent in the gas injection pipeline 406 and the gas injection pipeline 409 at all, and can not solve the problem of serious bias flow of the prevention and control agent; that is, since the instantaneous displacement of the metering pump 402 (i.e., the instantaneous total flow of the control agent in the manifold 403) is determined, when the operator opens the valve 404 to increase the opening degree and increases the filling flow of the control agent in the dosing pipe 405, the filling flow of the control agent in the dosing pipe 408 is necessarily decreased; similarly, when the operator increases the filling flow rate of the control agent of the dosing pipe 408, the filling flow rate of the control agent of the dosing pipe 405 is necessarily reduced correspondingly; thus, frequent freezing blockage of 1 gas injection pipeline in the gas injection pipelines 406 and 409 can be caused, and the gas well production is seriously influenced.

As known in the art, the metering pump belongs to a displacement pump, and the displacement of the metering pump is not changed along with the change of pressure; when its plunger (or diaphragm) stroke is timed, its displacement is no longer changed.

(5) In order to reduce the freezing and blocking times of the gas injection pipeline, an operator generally increases the discharge capacity of the metering pump 402 and greatly increases the dosage of the prevention and control agent so as to increase the actual dosage in the gas injection pipeline 406 and the gas injection pipeline 409; this inevitably results in a large amount of the prevention and control agent being wasted without being effectively utilized, thereby greatly increasing the gas production cost.

Therefore, the technical solution described in the production test of this comparative example cannot meet the production requirements of the northastringency field.

As is known in the art: gas lift production technology is adopted in gas wells in northeast gas fields, and gas injection pipeline freezing blockage inevitably seriously affects gas well production.

Example 2

Referring to fig. 5, a dosing system includes a container 300, a pump inlet pipe 301, a high pressure pump 302, a pump outlet tee 303, a backflow pipe 304, a backflow regulating valve 305, a backflow pipe 306, a drug delivery pipe 307, a drug dispensing tee 308, a first drug adding pipe 309, a first regulating valve 310, a first metering pipe 311, a first high pressure micro flow meter 312, a first drug dispensing pipe 313, a second drug dispensing tee 500, a second drug adding pipe 314, a second regulating valve 315, a second metering pipe 316, a second high pressure micro flow meter 317, a second drug dispensing pipe 501, a third drug adding pipe 502, a third regulating valve 503, a third metering pipe 504, and a third high pressure micro flow meter 505;

the side interface of the pump outlet tee 303 is communicated with the inlet of a backflow regulating valve 305 through a backflow pipe fitting 304, and the other end of the pump outlet tee 303 is communicated with one end of a medicine conveying pipe 307;

the other end of the first medicine distributing pipe 313 is communicated with one end of a second medicine distributing tee joint 500;

the side interface of the second medicine distributing tee 500 is communicated with one end of the second medicine feeding pipe 314, and the other end of the second medicine distributing tee is communicated with one end of the second medicine distributing pipe 501;

the other end of the second dosing pipe 314 is connected and communicated with a second high-pressure micro-flowmeter 317 sequentially through a second regulating valve 315 and a second metering pipe 316;

the other end of the second medicine distributing pipe 501 is connected and communicated with a third high-pressure micro-flowmeter 505 through a third medicine feeding pipe 502, a third regulating valve 503 and a third metering pipe 504 in sequence.

Example 3

Examples 1, 2 were repeated with the following differences:

the container is any one of a normal pressure container, a cube container, a cuboid container and a cylindrical container;

the high-pressure pump is any one of a centrifugal pump, a displacement pump, a rotor pump, a reciprocating pump, an electromagnetic pump, a gear pump, a metering pump and a film pump;

the high-pressure micro flowmeter is any one of a high-pressure gear flowmeter, an ultrasonic flowmeter, a high-pressure turbine flowmeter and a high-pressure metal pipe float flowmeter (or a rotor flowmeter), and the range of the high-pressure micro flowmeter is 5-60000 ml/hour;

the pipe fittings are any one of metal pipe fittings;

the three-way is any one of metal three-way;

the medicine conveying pipe is any one of a metal pipe, an aluminum plastic pipe, a steel plastic pipe, a high-pressure hose, a composite pipe and a pipe fitting;

the dosing pipe is any one of a metal pipe, an aluminum plastic pipe, a steel plastic pipe, a high-pressure hose, a composite pipe and a pipe fitting;

the medicine distributing pipe is any one of a metal pipe, an aluminum plastic pipe, a steel plastic pipe, a high-pressure hose, a composite pipe and a pipe fitting;

the pump inlet pipe is a pipeline or/and a pipeline made of any material;

the return pipe is a pipeline or/and a pipeline made of any material.

Example 4

Referring to fig. 6, a dosing system includes a container 300, a pump inlet pipe 301, a high pressure pump 302, a tee 303, a pipe 304, a backflow regulating valve 305, a backflow pipe 306, a drug delivery pipe 600, a regulating valve 310, a first metering pipe 311, and a high pressure micro flow meter 312;

an outlet of the high-pressure pump 302 is communicated with one end of a tee 303;

the side interface of the tee 303 is communicated with the inlet of a backflow regulating valve 305 by a pipe fitting 304, and the other end of the tee 303 is communicated with one end of a drug delivery pipe 600;

the other end of the medicine conveying pipe 600 is connected and communicated with the high-pressure micro flowmeter 312 through the regulating valve 310 and the first metering pipe 311 in sequence.

Production test example of this example: take 202H82 shale gas platform of Wiwa in Sichuan as an example. The platform carries out production tests by applying the technical scheme of the utility model from 6 months 1 day in 2021, and the results show that 6 wells of the platform are put into production gradually in multiple days and are not put into production simultaneously instantly (namely, the platform firstly adds medicines to 1 well and then gradually increases to 6 wells to add medicines); the technical scheme that the outlet of the metering pump used by the platform is provided with the backflow regulating valve has the following beneficial regulating effects: the dosage of the foam discharging agent (or the defoaming agent) required by the single well of the platform is only 0.8-1.3L/h; the technical scheme of the utility model not only solves the problem that a proper high-pressure and small-displacement metering pump is difficult to purchase in the current domestic market, but also can use (purchase) the metering pump with larger displacement to add chemicals to 1 gas well; but also can meet the actual requirement of the platform for 6 gas wells to be put into production step by step.

Example 5

Example 4 was repeated with the following differences:

the high-pressure micro flowmeter is any one of a high-pressure gear flowmeter, an ultrasonic flowmeter, a high-pressure turbine flowmeter and a high-pressure metal pipe float flowmeter (or a rotor flowmeter), and the measuring range is 5-60000 ml/hour;

the pipe fitting is any one of metal pipe fittings;

the tee joint is any one of metal tee joints;

the pump inlet pipe is a pipeline or/and a pipeline made of any material;

the return pipe is a pipeline or/and a pipeline made of any material.

Example 6

Referring to fig. 7, example 1 was repeated except that: in order to prevent high-pressure natural gas or/and liquid in a gas well or a pipeline from impacting and damaging the high-pressure micro flow meter, a first check valve 700 is arranged at the back of the first high-pressure micro flow meter 312 close to one end of the gas well, and the outlet of the first high-pressure micro flow meter 312 is communicated with the first check valve 700 through a first check pipe fitting 701; and a second check valve 702 is arranged at one end, close to the gas well, of the back of the second high-pressure micro flow meter 317, and the outlet of the second high-pressure micro flow meter 317 is communicated with the second check valve 702 through a second check pipe fitting 703.

Known from the knowledge in the art: the check valve is also called a one-way valve and a check valve, can ensure the unidirectional flow of the medium (or fluid) and can prevent the medium (or fluid) from flowing backwards; the device can be horizontally installed and used, and also can be vertically installed and used.

Known from the knowledge in the art: at present, no open data or successful precedent for using a check valve at the outlet of a metering pump or/and a gas well dosing pipeline exists; there is no disclosure or successful precedent for preventing natural gas backflow from gas wells and pipelines from damaging high pressure micro flow meters by using one-way valves.

Production test example of the present example: take 202H82 shale gas platform of Wiwa in Sichuan as an example.

The platform is provided with 6 gas wells, production tests are carried out by applying the technical scheme of the utility model from 6 months to 1 day in 2021, and the results show that: 12 check valves are arranged behind the 12 high-pressure micro flowmeters on the platform, so that the high-pressure natural gas and liquid in the oil sleeve annulus of the gas well and the ground pipeline can not flow back, and the high-pressure micro flowmeters can not be damaged by impact; during the period of continuously filling the foam discharging agent and the defoaming agent into the 6 wells of the platform for 15 days, all the 12 high-pressure micro flowmeters provided with the check valves operate normally without any damage.

Production test of this example comparative example: take the Suliger gas field as an example.

Referring to fig. 8, in order to solve the problem of metering and adjusting the dosing flow rate of the gas well foam discharging agent in the friger gas field, the applicant of the present invention performed a production test of 22 high-pressure micro flow meters in 22 gas wells of the friger gas field in 2021, in 5 months, and the technical scheme adopted by the production test can be briefly described as follows:

(1) the foam discharging agent in the foam discharging agent tank 800 enters a metering pump 802 through a pump inlet pipe 801, and then enters the air of an oil jacket of a gas well 806 through a dosing pipeline 803, a regulating valve 310, a first metering pipe 311, a high-pressure micro flow meter 312, a connecting pipe 804 and a sleeve valve 805 in sequence.

(2) And (3) metering the dosing flow of the foam discharging agent entering the gas well 806 (namely the discharge capacity of the metering pump 802) by using the high-pressure micro flow meter 312 with the flow range of 0.06-24 liters/hour.

(3) The plunger stroke of the metering pump 802 is used for controlling the turntable, and the dosing flow of the foam discharging agent (namely the discharge capacity of the metering pump 802) is adjusted.

The results of this production test show that:

(1) before the metering pump 802 is started for the first time, the high-pressure micro flow meter 312, the first metering pipe 311, the regulating valve 310 and the dosing pipeline 803 are in a normal pressure state inevitably; after the regulating valve 310 is opened, the high-pressure micro flow meter 312, the first metering pipe 311, the regulating valve 310 and the dosing pipeline 803 are still in a normal pressure state; at the moment of opening the casing valve 805, high-pressure natural gas (with the pressure of 3-15 MPa) in the air of the oil casing of the gas well 806 inevitably enters the high-pressure micro-flowmeter 312 through the casing valve 805 and the connecting pipe 804, and then enters the first metering pipe 311, the regulating valve 310 and the dosing pipeline 803 quickly.

Known from the knowledge in the art: the outlet valve of the metering pump 802 can effectively prevent high-pressure fluid from flowing back into the pump, and the metering pump 802 belongs to a displacement pump with adjustable displacement, and no backflow regulation is set at present; the mature operating protocol for the dosing pump 802 therefore specifies: all valves (including but not limited to the regulating valve 310 and the sleeve valve 805) behind the outlet of the metering pump 802 should be opened first, and then the metering pump 802 can be started (otherwise, the metering pump will be stuck).

(2) The flow range of the high-pressure micro flow meter 312 is only 0.06-24L/h; the natural gas pressure in the air of the 806 oil jacket ring of the gas well is as high as 3-15 MPa, the flow rate entering a normal pressure system is extremely high, and the impact force is extremely high; when the high-pressure natural gas in the air of the oil jacket of the gas well 806 quickly enters the high-pressure micro flow meter 312 in the normal pressure state, the flow rate of the high-pressure natural gas is far over 100 square/second and exceeds ten million times of the maximum flow rate range of the high-pressure micro flow meter 312; therefore, the high-pressure micro flow meter 312 must be instantaneously broken.

(3) The remanufacturing test after replacing the damaged high pressure micro-flowmeter 312 showed that: by immediately taking the solution of not opening the regulating valve 310 and extremely slowly opening the casing valve 805, the high-pressure gas in the air of the oil jacket of the gas well 806 can still instantaneously break the high-pressure micro-flowmeter 312.

(4) Through repeated improvement of the operation scheme, the technical scheme totals more than ten times of tests, and accumulates and damages 40 high-pressure micro flowmeters 312, the problem that the high-pressure micro flowmeters 312 are instantaneously damaged by high-pressure natural gas in the air of the oil jacket ring of the gas well 806 cannot be solved, the production requirement cannot be met, and finally the test has to be terminated and the technical scheme is abandoned.

Example 7

Referring to fig. 9, examples 1-2, 6 were repeated except that: in order to prevent the high-pressure natural gas or/and liquid from flowing back and impacting and damaging the high-pressure micro flow meter, a first check valve 700 is arranged at the back of the first high-pressure micro flow meter 312 close to one end of the gas well, and the outlet of the first high-pressure micro flow meter 312 is communicated with the first check valve 700 through a first check pipe fitting 701; a second check valve 702 is arranged at one end, close to the gas well, of the second high-pressure micro flow meter 317, and the outlet of the second high-pressure micro flow meter 317 is communicated with the second check valve 702 through a second check pipe 703; a third check valve 900 is arranged at one end, close to the gas well, behind the third high-pressure micro flow meter 505, and an outlet of the third high-pressure micro flow meter 505 is connected and communicated with the third check valve 900 through a third check pipe fitting 901.

Example 8

Referring to fig. 10, example 4 is repeated except that: in order to prevent the backflow of high-pressure natural gas or/and liquid from impacting and damaging the high-pressure micro flow meter, a check valve 1000 is arranged at the rear end of the high-pressure micro flow meter 312 close to one end of the gas well, and the outlet of the high-pressure micro flow meter 312 is communicated with the check valve 1000 through a pipe 1001.

Example 9

Examples 1-8 were repeated with the following differences: in order to solve the problem that the gas well has no industrial power supply, the power supply of the high-voltage micro flow meter is any one of a dry battery, a storage battery, solar power generation and wind power generation or any combination of any two or more of the dry battery, the storage battery, the solar power generation and the wind power generation.

Example 10

Examples 1-8 were repeated with the following differences: in order to solve the problem of unattended operation of the gas well, the flow signal of the high-voltage micro flowmeter is remotely transmitted to a different place or/and a management area, and a power supply required by remote transmission of the flow signal is any one of a dry battery and a storage battery.

Example 11

Examples 1-5 were repeated with the following differences: in order to solve the problem that the gas well has no industrial power supply, the power supply mode of the high-pressure pump is any one of solar power generation, wind power generation, storage battery power supply and generator power generation or any combination of any two or more of the solar power generation, the wind power generation, the storage battery power supply and the generator power generation.

Example 12

Examples 1-5, 11 were repeated with the following differences: in order to solve the problem of unattended operation of the gas well, the high-pressure pump is started and stopped at regular time by using a time relay.

Example 13

Examples 1-5 were repeated except that: in order to solve the problem of unattended operation of the gas well, the high-pressure pump is started and stopped by remote control of a remote computer.

Example 14

Referring to fig. 11, the dosing method for injecting the foam discharging agent into the 2 gas wells by using the dosing system described in example 1 or 6 comprises the following steps:

1) the outlet of the first check valve 700 is connected in communication with a first sleeve valve 1101 of a first gas well 1100 by a first connecting tubing 1102 and the outlet of the second check valve 702 is connected in communication with a second sleeve valve 1105 of a second gas well 1103 by a second connecting tubing 1104.

2) The first and second regulating

valves

310, 315 are opened, and then the first and

second sleeve valves

1101, 1105 are opened.

3) The backflow regulating valve 305 is opened.

4) The high pressure pump 302 is activated.

5) The opening degree of the backflow regulating valve 305 is gradually reduced, so that the instantaneous dosing flow rate of the first high-pressure micro flow meter 312 or/and the second high-pressure micro flow meter 317 is larger than or equal to the dosing flow rate required by the first gas well 1100 or/and the second gas well 1103.

6) The opening of the first regulating valve 310 is adjusted according to the instantaneous flow reading of the first high-pressure micro flow meter 312 until the instantaneous flow reading of the first high-pressure micro flow meter 312 meets the dosing flow requirement required by the first gas well 1100.

7) And adjusting the opening degree of the second regulating valve 315 or/and the backflow regulating valve 305 according to the instantaneous flow reading of the second high-pressure micro flow meter 317 until the instantaneous flow reading of the second high-pressure micro flow meter 317 meets the dosing flow requirement required by the second gas well 1103.

The platform utilizes a metering pump, a high-pressure micro-flowmeter and a check valve, and the production test is carried out by applying the platform from 6 months 1 in 2021, and the result shows that:

(1) the foam discharging agent can be simultaneously injected into 6 gas wells by using 1 metering pump, 6 high-pressure micro flowmeters and 6 check valves.

(2) The adopted high-pressure micro flow meter resists pressure of 40MPa, and the flow range is 0.06-24L/h, so that the production requirement of the platform foam discharging agent diluent for adding medicine of 0.8-1.3L/h is completely met; the instantaneous dosing flow and the accumulated dosing flow of each gas well can be accurately displayed in a digital display mode, and the error of the displacement estimation value of the metering pump obtained by controlling the rotary table according to the plunger stroke percentage of the metering pump can be effectively corrected.

(3) The scheme of setting the reflux regulating valve and the high-pressure micro flow meter has very prominent beneficial regulating effect: an operator can quickly adjust the dosing flow of the foam discharging agent of each gas well to the dosing flow required by the production of each gas well by adjusting the opening degrees of the backflow adjusting valve, the first adjusting valve and the second adjusting valve for a limited time according to the instantaneous flow reading of the high-pressure micro flow meter.

(4) The arrangement scheme of the backflow regulating valve has another very prominent beneficial regulating effect: can meet the actual production requirement of gradual production of 6 gas wells of the platform.

(5) The check valve that adopts sets up the scheme and has extremely outstanding beneficial effect: during the period that 6 wells of the platform are continuously filled with the foam discharging agent for 15 days, the 6 high-pressure micro flowmeters for filling the foam discharging agent all operate normally without any damage.

(6) Compared with the technical scheme of adding, injecting, foaming and discharging agents by adopting 6 metering pumps with rated discharge capacity of 5 liters/hour and rated pressure of 20MPa (single metering pump with rated power of 0.37KW and total rated power of 2.22KW), the adopted 1 metering pump has the rated power of 0.75KW, and can save electricity by 1.47KW, namely the electricity-saving efficiency of the technical scheme of the utility model is up to more than 66 percent, and the electricity-saving effect is extremely remarkable.

Example 15

Referring to fig. 12, the dosing method for injecting the foam discharging agent into the 3 gas wells by using the dosing system described in the embodiment 2 or 7 comprises the following steps:

1) the outlet of the first check valve 700 is connected to communicate with a first sleeve valve 1101 of the first gas well 1100 by a first connecting tubing 1102, the outlet of the second check valve 702 is connected to communicate with a second sleeve valve 1105 of the second gas well 1103 by a second connecting tubing 1104, and the outlet of the third check valve 900 is connected to communicate with a third sleeve valve 1202 of the third gas well 1200 by a third connecting tubing 1201.

2) The first, second, and third regulating

valves

310, 315, 503 are opened, and then the first, second, and

third sleeve valves

1101, 1105, 1202 are opened.

3) The backflow regulating valve 305 is opened.

4) The high pressure pump 302 is activated.

5) The opening degree of the backflow regulating valve 305 is gradually reduced, so that the instantaneous dosing flow rate of the first high-pressure micro flow meter 312 or/and the second high-pressure micro flow meter 317 or/and the third high-pressure micro flow meter 505 is larger than or equal to the required dosing flow rate of the first gas well 1100 or/and the second gas well 1103 or/and the third gas well 1200.

6) According to the instantaneous flow reading of the first high-pressure micro flow meter 312, the opening degree of the first regulating valve 310 is adjusted until the instantaneous flow reading of the first high-pressure micro flow meter 312 meets the dosing flow requirement required by the first gas well 1100.

8) The opening of the third regulating valve 503 or/and the back flow regulating valve 305 is adjusted according to the instantaneous flow reading of the third high pressure micro flow meter 505 until the instantaneous flow reading of the third high pressure micro flow meter 505 meets the dosing flow requirement required by the third gas well 1200.

Example 16

Referring to fig. 13, the dosing method for injecting the foam discharging agent into 1 gas well by using the dosing system described in example 4 or 8 comprises the following steps:

1) the outlet of the check valve 1000 is connected to and communicates with a casing valve 1302 of a gas well 1300 by a connecting pipe 1301.

2) The regulating valve 310 is opened first and then the sleeve valve 1302 is opened.

3) The backflow regulating valve 305 is opened.

4) The high pressure pump 302 is activated.

5) The opening of the regulating valve 310 or/and the return flow regulating valve 305 is adjusted until the instantaneous dosing flow reading of the high pressure micro flow meter 312 meets the dosing flow requirement required for the gas well 1300.

6 gas wells are built on the platform, production tests are carried out by applying the technical scheme of the utility model from 6 months 1 in 2021, and the results show that: 12 check valves are arranged behind the 12 high-pressure micro flowmeters on the platform, so that the high-pressure natural gas and liquid in the gas well oil sleeve annulus and the ground pipeline can not flow backwards, and the high-pressure micro flowmeters can not be damaged by impact; during the period of continuously filling the foam discharging agent and the defoaming agent into the 6 wells of the platform for 15 days, all the 12 high-pressure micro flowmeters provided with the check valves operate normally without any damage.

Production test of this example comparative example: take the case of a Suliger gas field.

(2) The dosing flow of the foam discharging agent entering the gas well 806 (namely the discharge capacity of a metering pump 802) is metered by using a high-pressure micro flowmeter 312 with the flow range of 0.06-24 liters per hour.

The results of this production test show that:

(1) before the metering pump 802 is started for the first time, the high-pressure micro flow meter 312, the first metering pipe 311, the regulating valve 310 and the dosing pipeline 803 are in a normal pressure state inevitably; after the regulating valve 310 is opened, the high-pressure micro flow meter 312, the first metering pipe 311, the regulating valve 310 and the dosing pipeline 803 are still in a normal pressure state; at the moment of opening the casing valve 805, high-pressure natural gas (with the pressure of 3-15 MPa) in the air of the oil jacket of the gas well 806 inevitably enters the high-pressure micro-flowmeter 312 through the casing valve 805 and the connecting pipe 804, and then enters the first metering pipe 311, the regulating valve 310 and the dosing pipeline 803 quickly.

(2) The flow range of the high-pressure micro flow meter 312 is only 0.06-24L/h; the natural gas pressure in the air of the 806 oil jacket ring of the gas well is as high as 3-15 MPa, the flow rate entering a normal pressure system is extremely high, and the impact force is extremely high; when the high-pressure natural gas in the air of the oil jacket of the gas well 806 quickly enters the high-pressure micro flowmeter 312 in a normal-pressure state, the flow rate of the high-pressure natural gas is far more than 100 square/second and exceeds the maximum flow rate range of the high-pressure micro flowmeter 312 by tens of millions of times; therefore, the high-pressure micro flow meter 312 must be instantaneously broken.

(3) The remanufacturing test after replacing the damaged high pressure micro-flowmeter 312 showed that: even if the technical solution of not opening the regulating valve 310 and extremely slowly opening the casing valve 805 is adopted, the high-pressure gas in the air of the oil jacket of the gas well 806 can still instantaneously break the high-pressure micro flow meter 312.

Example 17

Referring to fig. 14, the dosing method for filling the 2 gas well surface pipelines with the defoaming agent by using the dosing system described in example 1 or 6 comprises the following steps:

1) a first valve 1402 is provided on a first surface line 1401 of a first gas well 1400 and a second valve 1407 is provided on a second surface line 1405 of a second gas well 1404.

2) The outlet of the first check valve 700 is connected to and communicated with the first valve 1402 by a first connecting pipe member 1403, and the outlet of the second check valve 702 is connected to and communicated with the second valve 1407 by a second connecting pipe member 1406.

3) The first and second regulating

valves

310, 315 are opened, and then the first and

second valves

1402, 1407 are opened.

4) The backflow regulating valve 305 is opened.

5) The high pressure pump 302 is activated.

6) The opening degree of the backflow regulating valve 305 is gradually reduced, so that the instantaneous dosing flow rate of the first high-pressure micro flow meter 312 or/and the second high-pressure micro flow meter 317 is larger than or equal to the required dosing flow rate of the first gas well 1400 or/and the second gas well 1404.

7) And adjusting the opening degree of the first adjusting valve 310 according to the instantaneous flow reading of the first high-pressure micro flow meter 312 until the instantaneous flow reading of the first high-pressure micro flow meter 312 meets the dosing flow requirement required by the first gas well 1400.

8) The opening of the second regulator valve 315 or/and the return regulator valve 305 is adjusted based on the instantaneous flow reading of the second high pressure micro flow meter 317 until the instantaneous flow reading of the second high pressure micro flow meter 317 meets the dosing flow requirement required for the second gas well 1404.

Production test example of the present example: take the Wio 202H82 shale gas platform of Wiwa in Sichuan as an example.

(1) 1 metering pump, 6 high-pressure micro flowmeters and 6 check valves are used for simultaneously filling the defoaming agent into 6 gas wells.

(2) The adopted high-pressure micro flow meter resists pressure of 40MPa, and the flow range is 0.06-24L/h, so that the production requirement of 0.8-1.3L/h of the dosing flow of the defoaming agent diluent of each gas well of the platform is completely met; the instantaneous dosing flow and the accumulated dosing flow of each gas well ground pipeline can be accurately displayed in a digital display mode, and the error of the displacement estimation value of the metering pump obtained by controlling the turntable by depending on the plunger stroke percentage of the metering pump can be effectively corrected.

(3) The scheme of setting the reflux regulating valve and the high-pressure micro flow meter has very prominent beneficial regulating effect: an operator can quickly adjust the dosing flow of the defoaming agent to the dosing flow required by the production of the ground pipeline of each gas well by adjusting the opening degrees of the backflow adjusting valve, the first adjusting valve and the second adjusting valve for a limited time according to the instantaneous flow reading of the high-pressure micro flow meter.

(4) The arrangement scheme of the backflow regulating valve has another very prominent beneficial regulating effect: the actual production requirement of the platform 6 gas wells on production step by step can be met.

(5) The check valve that adopts sets up the scheme and has extremely outstanding beneficial effect: during the period of continuously filling the defoaming agent into the 6 wells of the platform for 15 days, the 6 high-pressure micro flowmeters for filling the defoaming agent all operate normally without any damage.

(6) Compared with the technical scheme that 6 metering pumps with rated discharge capacity of 5 liters/hour and rated pressure of 20MPa (single metering pump with rated power of 0.37KW and total rated power of 2.22KW) are adopted and defoaming agents are added, the power can be saved by 1.47KW, namely the power saving efficiency of the technical scheme is up to more than 66%, and the power saving effect is extremely obvious.

Example 18

Referring to fig. 15, the dosing method for filling the defoaming agent into the surface pipeline of the 3 gas wells by using the dosing system described in example 2 or 7 comprises the following steps:

1) a first valve 1402 is provided on a first surface line 1401 of a first gas well 1400, a second valve 1407 is provided on a second surface line 1405 of a second gas well 1404, and a third valve 1502 is provided on a third surface line 1501 of a third gas well 1500.

2) The outlet of the first check valve 700 is connected to and communicated with the first valve 1402 by a first connecting pipe member 1403, the outlet of the second check valve 702 is connected to and communicated with the second valve 1407 by a second connecting pipe member 1406, and the outlet of the third check valve 900 is connected to and communicated with the third valve 1502 by a third connecting pipe member 1503.

3) The first, second, and third regulating

valves

310, 315, 503 are opened, and then the first, second, and

third valves

1402, 1407, 1502 are opened.

4) The backflow regulating valve 305 is opened.

5) The high pressure pump 302 is activated.

6) And gradually closing the opening degree of the backflow regulating valve 305 so as to enable the instantaneous dosing flow rate of the first high-pressure micro flow meter 312 or/and the second high-pressure micro flow meter 317 or/and the third high-pressure micro flow meter 505 to be larger than or equal to the required dosing flow rate of the first gas well 1400 or/and the second gas well 1404 or/and the third gas well 1500.

9) And adjusting the opening degree of the third regulating valve 503 or/and the backflow regulating valve 305 according to the instantaneous flow reading of the third high-pressure micro flow meter 505 until the instantaneous flow reading of the third high-pressure micro flow meter 505 meets the dosing flow requirement required by the third gas well 1500.

Example 19

Referring to fig. 16, the dosing method for filling the defoaming agent into the surface pipeline of 1 gas well by using the dosing system described in example 4 or 8 comprises the following steps:

1) a valve 1602 is provided on a surface pipeline 1601 of a gas well 1600,

2) the outlet of the check valve 1000 is connected to the valve 1602 by a connecting tube 1603.

3) The regulator valve 310 is opened first and then the valve 1602 is opened.

4) The backflow regulating valve 305 is opened.

5) The high pressure pump 302 is activated.

6) The opening of the regulating valve 310 or/and the return flow regulating valve 305 is adjusted until the instantaneous dosing flow reading of the high pressure micro flow meter 312 meets the dosing flow requirement required by the gas well 1600 surface line 1601.

The platform is built in 2021, and production tests are carried out by applying the technical scheme of the utility model from 6 months to 1 days, and the results show that: 12 check valves are arranged behind the 12 high-pressure micro flowmeters on the platform, so that the high-pressure natural gas and liquid in the gas well oil sleeve annulus and the ground pipeline can not flow backwards, and the high-pressure micro flowmeters can not be damaged by impact; during the period of continuously filling the foam discharging agent and the defoaming agent into the 6 wells of the platform for 15 days, all the 12 high-pressure micro flowmeters provided with the check valves operate normally without any damage.

Referring to fig. 8, in order to solve the metering and adjusting problem of the dosing flow of the gas well foam discharging agent in the friger gas field, the applicant of the present invention performed a production test of 22 high-pressure micro flow meters in 22 gas wells of the friger gas field in 5 months in 2021, and the results of the production test show that:

(3) The remanufacturing test after replacing the damaged high pressure micro flow meter 312 showed that: even if the technical solution of not opening the regulating valve 310 and extremely slowly opening the casing valve 805 is adopted, the high-pressure gas in the air of the oil jacket of the gas well 806 can still instantaneously break the high-pressure micro flow meter 312.

Example 20

Examples 14-16 were repeated with the following differences: the dosing system is used for adding any one of a foam discharging agent, a corrosion inhibitor, a bactericide, a scale inhibitor and a corrosion and scale inhibitor or a mixture of any two of the foam discharging agent, the corrosion inhibitor, the bactericide, the scale inhibitor and the corrosion and scale inhibitor into any number of 4-50 gas wells in any proportion.

Example 21

Examples 17-19 were repeated with the following differences: the chemical adding system is used for adding any one or a mixture of any two or more of a defoaming agent, a corrosion inhibitor, a bactericide, a scale inhibitor and a corrosion and scale inhibitor in any number of 4-50 gas production pipelines in any proportion.

Example 22

Examples 17-19 were repeated with the following differences: the dosing system is used for filling any one or a mixture of any two or more of an antifreeze agent, a blocking remover, a prevention and control agent, a hydrate inhibitor, an antifreeze blocking remover, a corrosion inhibitor, a scale inhibitor, a cleaning agent and a functional chemical agent into any number of gas injection pipelines in 1-50 gas injection pipelines.

Example 23

Examples 14-16 were repeated with the following differences: the chemical adding system is used for adding any one or a mixture of any two or more of a corrosion inhibitor, a scale inhibitor, a bactericide, a viscosity reducer, a paraffin remover, a paraffin removal and prevention agent, a pour point depressant, an emulsifier, a foaming agent, an oil displacement agent and a drag reducer to any number of oil wells in 1-50 oil wells at any proportion.

Example 24

Examples 14-16 were repeated except that: the chemical adding system is used for adding any one or a mixture of any two or more of a corrosion inhibitor, a scale inhibitor, a bactericide, a viscosity reducer, a paraffin remover, a paraffin removing and preventing agent, a pour point depressant, an emulsifier, a foaming agent, an oil displacement agent and a drag reducer to any number of oil wells in 1-50 water injection wells.

Example 25

Examples 17-19 were repeated with the following differences: the dosing system is used for adding any one or a mixture of more than two of any one of a corrosion inhibitor, a scale inhibitor, a bactericide, a viscosity reducer, a paraffin remover, a pour point depressant, an emulsifier, a foaming agent, an oil displacement agent and a drag reducer to any number of oil production lines in 1-50 oil production lines.

Example 25

Examples 17-19 were repeated except that: the dosing system is used for filling any one or a mixture of more than two of any one of a corrosion inhibitor, a scale inhibitor, a bactericide, a viscosity reducer, a paraffin remover, a pour point depressant, an emulsifier, a foaming agent, an oil displacement agent and a drag reducer into any number of water injection pipelines in 1-50 water injection pipelines.

The terms "upper," "lower," "left," "right," and the like as used herein to describe the orientation of the components are based on the orientation as shown in the figures of the drawings for convenience of description, and in actual systems, the orientation may vary depending on the manner in which the system is arranged.

It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Not all embodiments are exhaustive. All obvious changes and modifications which are obvious to the technical scheme of the utility model are covered by the protection scope of the utility model.

Claims

1. A dosing system, characterized in that: the device comprises a container, a pump inlet pipe, a high-pressure pump, a pump outlet tee joint, a backflow pipe fitting, a backflow regulating valve, a backflow pipe, a medicine conveying pipe, a medicine distributing tee joint, a first medicine adding pipe, a first regulating valve, a first metering pipe fitting, a first high-pressure micro-flowmeter, a first medicine distributing pipe, a second medicine adding pipe, a second regulating valve, a second metering pipe fitting and a second high-pressure micro-flowmeter;

2. The dosing system of claim 1, wherein: a first check valve is arranged at one end, close to the gas well, behind the first high-pressure micro flow meter, and an outlet of the first high-pressure micro flow meter is communicated with the first check valve through a first check pipe fitting; and a second check valve is arranged at one end, close to the gas well, behind the second high-pressure micro flow meter, and an outlet of the second high-pressure micro flow meter is connected and communicated with the second check valve through a second check pipe fitting.

3. A medicine feeding system which characterized in that: the device comprises a container, a pump inlet pipe, a high-pressure pump, a pump outlet tee joint, a backflow pipe fitting, a backflow regulating valve, a backflow pipe, a medicine conveying pipe, a medicine distributing tee joint, a first medicine adding pipe, a first regulating valve, a first metering pipe fitting, a first high-pressure micro-flowmeter, a first medicine distributing pipe, a second medicine distributing tee joint, a second medicine adding pipe, a second regulating valve, a second metering pipe fitting, a second high-pressure micro-flowmeter, a second medicine distributing pipe, a third medicine adding pipe, a third regulating valve, a third metering pipe fitting and a third high-pressure micro-flowmeter;

the side surface interface of the second medicine distributing tee joint is communicated with one end of a second medicine feeding pipe, and the other end of the second medicine distributing tee joint is communicated with one end of a second medicine distributing pipe;

4. The medicated system of claim 3, wherein: a first check valve is arranged at one end, close to the gas well, behind the first high-pressure micro flow meter, and an outlet of the first high-pressure micro flow meter is communicated with the first check valve through a first check pipe fitting; a second check valve is arranged at one end, close to the gas well, behind the second high-pressure micro flow meter, and an outlet of the second high-pressure micro flow meter is communicated with the second check valve through a second check pipe fitting; and a third check valve is arranged at one end, close to the gas well, behind the third high-pressure micro flow meter, and the outlet of the third high-pressure micro flow meter is connected and communicated with the third check valve through a third check pipe fitting.

5. A medicine feeding system which characterized in that: comprises a container, a pump inlet pipe, a high-pressure pump, a tee joint, a backflow regulating valve, a backflow pipe, a medicine conveying pipe, a regulating valve, a pipe fitting and a high-pressure micro-flowmeter;

the outlet of the reflux regulating valve is communicated with the bottom of the container through a reflux pipe;

6. The medicated system of claim 5, wherein: and a check valve is arranged at one end, close to the gas well, behind the high-pressure micro flow meter, and the outlet of the high-pressure micro flow meter is connected and communicated with the check valve through a pipe fitting.