CN112554847B - Antifreezing cluster type oil well multi-wellhead double-medicament injection device, system and method - Google Patents
Antifreezing cluster type oil well multi-wellhead double-medicament injection device, system and method Download PDFInfo
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- CN112554847B CN112554847B CN202011327217.5A CN202011327217A CN112554847B CN 112554847 B CN112554847 B CN 112554847B CN 202011327217 A CN202011327217 A CN 202011327217A CN 112554847 B CN112554847 B CN 112554847B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
Abstract
The invention belongs to the technical field of oil extraction in an oil field, and particularly relates to an antifreezing cluster type oil well multi-wellhead double-agent injection device, system and method. The invention comprises a PLC controller, a first medicine tank, a second medicine tank, a metering plunger pump, a first medicine tank electromagnetic valve, a second medicine tank electromagnetic valve, a plurality of oil well electromagnetic valves and a manifold, which are organically combined into a multi-wellhead double-medicament injection device, and a multi-wellhead double-medicament injection system is formed by the arrangement of a remote monitoring platform. The invention realizes small-dose round-robin injection of a cluster well group and a motor well, reduces the primary investment cost, meets the requirement of continuously exerting the effect of the agent in the oil well shaft, simultaneously utilizes the low-temperature resistance characteristic of the oil-based paraffin remover, controls the sequence of adding the agent by a program, realizes the antifreezing of the dosing pipeline, greatly simplifies the structure of the dosing device, saves the energy consumption, reduces the construction cost and ensures the reliable operation of the dosing device in winter on site.
Description
Technical Field
The invention belongs to the technical field of oil extraction in an oil field, and particularly relates to an antifreezing cluster type oil well multi-wellhead double-agent injection device, system and method.
Background
In the oil extraction production process of an oil field, in order to ensure normal production of the oil field, various agents are required to be added into the oil collar of the oil field, wherein the paraffin removal and prevention agent is especially used in a majority, but sometimes part of the oil field is accompanied by overflow of hydrogen sulfide, so that serious threat is formed to the health of on-site staff, in order to effectively avoid harm of the hydrogen sulfide to a shaft and personnel, and meanwhile, the formation of wax scale of the shaft is prevented, an oil-based paraffin removal and prevention agent and a water-based hydrogen sulfide inhibitor are required to be added into the shaft periodically to reduce the overflow amount of the downhole pump, the paraffin deposition scale of a pipe column and the hydrogen sulfide. The oil-based paraffin removal and prevention agent has an antifreezing property, the condensation point is at minus 30 ℃, the water-based hydrogen sulfide inhibitor is easy to freeze in winter due to water content, and the two agents cannot react chemically to influence the application effect.
With the gradual penetration of oil field development, cluster well groups are mostly adopted in oil field well sites. The cluster well group means that a plurality of wells are drilled at a well site, the well heads of the wells are less than a few meters apart, and the well bottoms of the wells extend to different directions. Along with the gradual improvement of the automation level of the oil field, more and more oil wells adopt an automatic agent injection device to carry out agent injection, but the agent injection mode of a single machine to a single well is adopted, and the single machine to the single well causes the problems of large investment in the early stage of the agent injection device of the oil field well site and high operation and later maintenance cost. In order to ensure the normal operation of the automatic dosing device in winter and prevent the water-based hydrogen sulfide inhibitor from freezing at low temperature to block the pipeline, damage equipment and influence normal production, the pipeline and the medicine tank of the device are required to be heated and insulated. However, the current common method for heating and heat preservation of the medicine tank adopts an invasive explosion-proof electric heater, the pipeline is insulated by adopting a winding electric tracing band, the construction amount of the winding electric tracing band is large, the operation energy consumption is large, the whole structure of the device tends to be complex, and the later maintenance difficulty is large after the burying treatment is carried out on the tracing band and the pipeline.
Therefore, based on the above reasons, it is necessary to explore a multi-wellhead double-agent injection device, system and method for an anti-freezing cluster type oil well, which are simple and convenient in construction, and energy-saving and consumption-reducing methods, ensure that the dosing device runs safely, conveniently and reliably in winter, meet the requirements of dosing work of the oil well in winter, and ensure the convenience, economy and reliability of cluster type well group injection.
Disclosure of Invention
The invention provides an antifreezing cluster type oil well multi-wellhead double-medicament injection device, a system and a method, and aims to solve the problems that an existing automatic medicament injection device can only inject single-well medicaments by a single machine, the primary investment is high, and the operation and later maintenance cost is high. The second aim is to overcome the defects of large construction amount and high energy consumption of the electric tracing band from the chemical feeding device to the wellhead chemical feeding pipeline, simplify the heat preservation process of the chemical feeding device pipeline and ensure the reliable operation of the chemical feeding device in winter.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
an antifreezing cluster type oil well multi-wellhead double-medicament injection device comprises a PLC controller, a first medicament tank, a second medicament tank, a metering plunger pump, a first medicament tank electromagnetic valve, a second medicament tank electromagnetic valve, a plurality of oil well electromagnetic valves and a collecting pipe; the oil well electromagnetic valves are respectively connected to the corresponding oil wells through chemical adding pipelines; the first medicine tank electromagnetic valve is connected to the first medicine tank, and the second medicine tank electromagnetic valve is connected to the second medicine tank; the first medicine tank electromagnetic valve and the second medicine tank electromagnetic valve are connected to the suction inlet of the metering plunger pump through a tee joint, and the discharge outlet of the metering plunger pump is connected with the oil well electromagnetic valves on all the oil wells respectively through a collecting pipe.
The first medicine tank electromagnetic valve, the second medicine tank electromagnetic valve and the plurality of oil well electromagnetic valves are all normally closed high-voltage electromagnetic ball valves.
The first medicine tank is filled with a hydrogen sulfide inhibitor; the second medicine tank is filled with an antifreezing and paraffin-removing agent.
The hydrogen sulfide inhibitor adopts a water-based hydrogen sulfide imitation agent, and the antifreezing paraffin remover adopts an oil-based paraffin remover.
An antifreezing cluster type oil well multi-wellhead double-medicament injection system at least comprises an antifreezing cluster type oil well multi-wellhead double-medicament injection device and a remote monitoring platform; the remote monitoring platform is in electrical signal connection with a PLC controller in the anti-freezing cluster type oil well multi-wellhead double-medicament injection device.
An injection method of an antifreezing cluster type oil well multi-wellhead double-agent injection system comprises the following steps,
step one: presetting the displacement of a metering plunger pump, a dosing interval period and daily dosing of each oil well, and inputting the displacement, the dosing interval period and daily dosing of each oil well into a remote monitoring platform;
step two: the remote monitoring platform calculates the injection amount of each oil well in the injection interval period according to the first step;
step three: calculating the start-stop time length of the metering plunger pump in the oil well dosing interval period according to the first step and the second step;
Step four: the remote monitoring platform sends the result calculated in the step two to a PLC controller in the injection device on the well site;
step five: and the PLC starts executing the injection program at all points according to the set injection interval period.
And in the first step, the unit of the injection interval period is hours, and the injection interval period is less than or equal to 24 hours.
In the second step, the injection amount of each oil well in the injection interval period is calculated by adopting the following formula:
and is also provided with
Wherein T is the injection interval period;
h is a constant, which is 24 hours;
d is daily oil well injection dose;
n is the number of wells in the well group;
D Ti the injection amount of the ith oil well in the injection interval period is the sum of the injection amounts of the paraffin removal inhibitor and the hydrogen sulfide inhibitor in the injection interval period.
In the third step, the starting and stopping time of the metering plunger pump in the oil well injection interval period is t,
t＝D T ×Q
wherein: d (D) T The injection amount of the oil well in the injection interval period is;
q is the pump displacement of the metering plunger pump.
The injection procedure in the fifth step is as follows:
the first step: adding a water-based hydrogen sulfide inhibitor;
the PLC controls the first medicine tank electromagnetic valve, the metering plunger pump and the oil well electromagnetic valve on the first oil well to be opened, then the medicine in the first medicine tank is sucked by the metering plunger pump and is discharged into the oil jacket annulus of the first oil well through the collecting pipe and the oil well electromagnetic valve on the first oil well through the injection pipeline, and finally when the starting time of the metering plunger pump is equal to the set time, the PLC controls the metering plunger pump and the oil well electromagnetic valve on the first oil well to be closed; then, the PLC controller sequentially controls the oil well electromagnetic valves and the metering plunger pumps on the second oil well to the last oil well to be opened and closed according to the process, and the water-based hydrogen sulfide inhibitor of all the oil wells of the cluster well group is added according to the set time length;
And a second step of: after the first step is finished, the PLC controls the first medicine tank electromagnetic valve, the metering plunger pump and the oil well electromagnetic valve on the last oil well to be closed;
and a third step of: adding wax cleaning and preventing agent
The PLC controls the solenoid valve of the second medicine tank, the metering plunger pump and the solenoid valve of the oil well I to be opened, the medicine in the second medicine tank is sucked by the metering plunger pump and is discharged into the oil jacket annulus of the oil well I through the collecting pipe and the solenoid valve of the oil well I through the injection pipeline, and finally when the starting time of the metering plunger pump is equal to the set time, the PLC controls the solenoid valves of the metering plunger pump and the oil well I at the upper end of the oil well I to be closed, and then, the PLC sequentially controls the solenoid valve of the oil well II to the oil well I and the metering plunger pump to be opened and closed according to the process, and the addition of all the oil well wax cleaning and preventing agents of the cluster well group is completed according to the set time;
fourth step: after the third step is completed, the PLC controls the second medicine tank electromagnetic valve, the metering plunger pump and the oil well electromagnetic valve on the last oil well to be closed.
Fifth step: after the next bolus interval period begins, the first through fourth steps are repeated.
The beneficial effects are that:
(1) When the automatic metering device is operated, parameters such as the discharge capacity of the metering plunger pump, the injection interval period, daily injection dosage of each oil well and the like are set on the remote monitoring platform, and the remote monitoring platform automatically calculates the start-stop time of the metering plunger pump in the two medicament dosing interval periods according to the set parameters and sends the start-stop time to the PLC in the injection device on the well site through the oil area local area network. And the PLC controls the electromagnetic valve of the pharmaceutical tank, the metering plunger pump and the electromagnetic valve of the oil well to sequentially open the injection agent for each oil well wheel according to the calculated start-stop time of the metering plunger pump in the injection interval period, and simultaneously fully utilizes the low temperature resistance characteristic of the oil-based paraffin removal and prevention agent, and realizes the anti-freezing and blocking of pipelines by the addition sequence of the hydrogen sulfide inhibitor and the paraffin removal and prevention agent.
(2) The invention solves the problems that the existing automatic injection device only has large investment for single-well injection at one time in the earlier stage and high operation and later maintenance cost, can realize small-dose round-trip injection of a cluster well group by simply controlling the electromagnetic valve and the metering plunger pump according to a program by using a PLC, reduces the investment cost at one time in the earlier stage, meets the requirement of continuously exerting the medicament effect in an oil well shaft, and simultaneously realizes the anti-freezing of a medicament adding pipeline by utilizing the low temperature resistance characteristic of the oil-based paraffin remover and controlling the sequence of medicament addition through the program.
(3) The invention greatly simplifies the structure of the dosing device, saves energy consumption, reduces construction cost and ensures reliable operation of the dosing device in winter.
The foregoing description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present invention will be given.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic process flow diagram of an antifreeze cluster type oil well multi-wellhead dual-agent injection system.
FIG. 2 is a flow chart of the execution of the injection interval period of the freeze-protected burst type oil well multi-wellhead dual-agent injection system.
In the figure: 1-a remote monitoring platform; a 2-PLC controller; 3-a first canister; 4-a second canister; 5-metering plunger pump; 6-a first medicine tank electromagnetic valve; 7-a second medicine tank electromagnetic valve; 8-an oil well solenoid valve; 9-collecting pipe; 10-well number one; 11-well number two; 12-well No. three; 13-well number four; 14-fifth well; 15-six wells.
The foregoing description is only an overview of the technical solution of the present invention, and in order to make the technical means of the present invention more clearly understood, it can be implemented according to the content of the specification, and the following detailed description of the preferred embodiments of the present invention will be given.
Detailed Description
The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Embodiment one:
referring to FIG. 1, the freeze-proof cluster type oil well multi-wellhead double-medicament injection device comprises a PLC (programmable logic controller) 2, a first medicament tank 3, a second medicament tank 4, a metering plunger pump 5, a first medicament tank electromagnetic valve 6, a second medicament tank electromagnetic valve 7, a plurality of oil well electromagnetic valves 8 and a collecting pipe 9; the oil well electromagnetic valves 8 are respectively connected to corresponding oil wells through chemical adding pipelines; the first medicine tank electromagnetic valve 6 is connected to the first medicine tank 3, and the second medicine tank electromagnetic valve 7 is connected to the second medicine tank 4; the first medicine tank electromagnetic valve 6 and the second medicine tank electromagnetic valve 7 are connected to the suction inlet of the metering plunger pump 5 through a tee joint, and the discharge outlet of the metering plunger pump 5 is respectively connected with the oil well electromagnetic valves 8 on the oil wells through a collecting pipe 9.
In specific application, the PLC 2 controls the first medicine tank 3, the second medicine tank 4, the metering plunger pump 5, the first medicine tank electromagnetic valve 6, the second medicine tank electromagnetic valve 7 and the plurality of oil well electromagnetic valves 8 to start executing the injection program according to the set injection interval period.
The injection procedure is specifically as follows:
firstly, water-based hydrogen sulfide inhibitor is added. The PLC 2 controls the first medicine tank electromagnetic valve 6, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the first oil well 10 to be opened, then the medicine in the first medicine tank 3 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the first oil well 10 through the pipe header 9 and the oil well electromagnetic valve 8 on the first oil well 10, and finally when the starting time of the metering plunger pump 5 is equal to the set time, the PLC 2 controls the metering plunger pump 5 and the oil well electromagnetic valve 8 on the first oil well 10 to be closed; and then, the PLC 2 sequentially controls the oil well electromagnetic valve 8 and the metering plunger pump 5 on the second oil well 11 to the last oil well to be opened and closed according to the process, and the water-based hydrogen sulfide inhibitor is added to all the oil wells of the cluster well group according to the set time length. Subsequently, the PLC controller 2 controls the first canister solenoid valve 6, the metering plunger pump 5, and the well solenoid valve 8 on the last well to close.
And after the water-based hydrogen sulfide inhibitor is added, adding a paraffin removal and prevention agent. The PLC 2 controls the second medicine tank electromagnetic valve 7, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the first oil well 10 to be opened, the medicine in the second medicine tank 4 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the first oil well 10 through the collecting pipe 9 and the oil well electromagnetic valve 8 on the first oil well 10, finally when the starting time of the metering plunger pump 5 is equal to the set time, the PLC 2 controls the metering plunger pump 5 and the oil well electromagnetic valve 8 on the upper end of the first oil well 10 to be closed, and then the PLC 2 sequentially controls the opening and closing of the oil well electromagnetic valve 8 on the second oil well 11 to the last oil well and the metering plunger pump 5 according to the above process, and the addition of all the oil well paraffin removal and prevention agents of the cluster well group is completed according to the set time; then, the PLC controller 2 controls the second canister solenoid valve 7, the metering plunger pump 5, and the well solenoid valve 8 on the last well to be closed. After the start of the next dosing interval period, the water-based hydrogen sulfide inhibitor dosing and the water-based hydrogen sulfide inhibitor dosing process are repeated.
The invention solves the problems that the existing automatic injection device only has large investment for single-well injection in the early stage and high operation and later maintenance cost, and can realize the injection of the small-dose wheel inspection injection of the cluster well group by simply controlling a plurality of electromagnetic valves 8 and metering plunger pumps 5 according to a program by a PLC (programmable logic controller) 2, thereby reducing the investment cost in the early stage, meeting the requirement of continuously exerting the chemical effect in the oil well shaft, simultaneously utilizing the low-temperature resistant characteristic of the oil-based paraffin remover, controlling the sequence of adding the chemical by the program, realizing the anti-freezing of the chemical adding pipeline, overcoming the defects of large construction amount and high energy consumption of an electric tracing band from the chemical adding device to a wellhead chemical adding pipeline section in the prior art, simplifying the heat preservation process of the chemical adding device pipeline, saving the energy consumption, reducing the construction cost and ensuring the reliable operation of the chemical adding device in winter.
The PLC controller 2 in the present embodiment adopts the prior art.
Embodiment two:
referring to an antifreezing cluster type oil well multi-wellhead double-medicament injection device shown in fig. 1, on the basis of the first embodiment, the first medicament tank electromagnetic valve 6, the second medicament tank electromagnetic valve 7 and the plurality of oil well electromagnetic valves 8 are all normally closed high-pressure electromagnetic ball valves.
In practical use, in order to prevent casing gas and residual medicines in the oil well casing from flowing back to the metering plunger pump 5, cavitation of the metering plunger pump 5 is caused, pump idling is not excessive, the first medicine tank electromagnetic valve 6, the second medicine tank electromagnetic valve 7 and the plurality of oil well electromagnetic valves 8 are all normally closed high-voltage electromagnetic ball valves, and double insurance is required. In order to avoid the problems, a check valve can be arranged in front of each electromagnetic valve in a matched mode.
Embodiment III:
referring to the anti-freezing cluster type oil well multi-wellhead double-medicament injection device shown in fig. 1, on the basis of the first embodiment, a hydrogen sulfide inhibitor is arranged in the first medicament tank 3; the second medicine tank 4 is filled with an antifreezing and paraffin-removing agent.
Furthermore, the hydrogen sulfide inhibitor adopts a water-based hydrogen sulfide imitation agent, and the antifreezing paraffin removal inhibitor adopts an oil-based paraffin removal inhibitor.
When in actual use, the injection agent is sequentially started to each oil well wheel through the PLC 2 in the injection interval period, meanwhile, the low temperature resistance characteristic of the oil-based paraffin removal and prevention agent is fully utilized, and the anti-freezing and blocking of the pipeline are realized through the addition sequence of the hydrogen sulfide inhibitor and the paraffin removal and prevention agent. The technical scheme of the invention solves the problems that the existing automatic injection device only has large investment on single-well injection at one time in the early stage and high operation and later maintenance cost, can realize small-dose round-robin injection of a cluster well group by simply controlling the first medicine tank electromagnetic valve 6, the second medicine tank electromagnetic valve 7 and the plurality of oil well electromagnetic valves 8 according to a program by the PLC controller 2, reduces the investment cost at one time in the early stage, meets the requirement of continuously exerting the medicine effect in an oil well shaft, and simultaneously realizes the antifreezing of medicine adding pipelines by controlling the sequence of adding medicines through the program by utilizing the low-temperature resistance characteristic of the oil-based paraffin remover, thereby greatly simplifying the structure of the medicine adding device, saving energy consumption, reducing construction cost and ensuring the reliable operation of the medicine adding device in winter on site.
Embodiment four:
referring to FIG. 1, the freeze-proof cluster type oil well multi-wellhead double-medicament injection system at least comprises a freeze-proof cluster type oil well multi-wellhead double-medicament injection device and a remote monitoring platform 1; the remote monitoring platform 1 is in electric signal connection with a PLC controller 2 in the anti-freezing cluster type oil well multi-wellhead double-medicament injection device.
In actual use, the remote monitoring platform 1 calculates and obtains the injection quantity of each oil well in the injection interval period according to the preset displacement of the metering plunger pump 5, the injection interval period and the daily injection quantity of each oil well. Then the remote monitoring platform 1 calculates the start-stop time length of the metering plunger pump 5 in the oil well dosing interval period according to the calculation result, and sends the calculation result to the PLC controller 2 in the injection device on the well site; the PLC 2 starts executing the injection program at all points according to the set injection interval period.
The invention solves the problems that the existing automatic agent injection device only has large investment for single-well agent injection in the early stage and high operation and later maintenance cost.
The invention greatly simplifies the structure of the dosing device, saves energy consumption, reduces construction cost and ensures reliable operation of the dosing device in winter.
By adopting the technical scheme, the filling accuracy is improved, the automation degree is high, and the labor is saved.
Fifth embodiment:
an injection method of an antifreezing cluster type oil well multi-wellhead double-agent injection system comprises the following steps,
step one: the displacement of the metering plunger pump 5, the injection interval period and daily injection dosage of each oil well are preset and input to the remote monitoring platform 1;
Step two: the remote monitoring platform 1 calculates the injection amount of each oil well in the injection interval period according to the first step;
step three: the remote monitoring platform 1 calculates the start-stop time length of the metering plunger pump 5 in the oil well dosing interval period according to the first step and the second step;
step four: the remote monitoring platform 1 sends the result of the calculation in the step two to a PLC controller 2 in the injection device on the well site;
step five: the PLC 2 starts executing the injection program at all points according to the set injection interval period.
Further, the unit of the injection interval period in the first step is hours, and the injection interval period is less than or equal to 24 hours.
In actual use, the remote monitoring platform 1 only needs to set parameters such as the discharge capacity of the metering plunger pump 5, the injection interval period, daily injection dosage of each oil well and the like, and the remote monitoring platform 1 automatically calculates the start-stop time of the metering plunger pump 5 in the two medicament dosing interval periods according to the set parameters and sends the start-stop time to the PLC 2 in the injection device on the well site through the oil area local area network. The PLC 2 controls the first medicine tank electromagnetic valve 6, the second medicine tank electromagnetic valve 7, the metering plunger pump 5 and the plurality of oil well electromagnetic valves 8 to sequentially open the injection agent for each oil well wheel according to the calculated start-stop time of the metering plunger pump 5 in the injection interval period, simultaneously fully utilizes the low temperature resistance characteristic of the oil-based paraffin removal and prevention agent, and realizes the anti-freezing and blocking of pipelines through the addition sequence of the hydrogen sulfide inhibitor and the paraffin removal and prevention agent.
The invention solves the problems that the existing automatic injection device only has large investment for single-well injection in the early stage and high operation and later maintenance cost, can realize the small-dose round injection of the cluster well group-well by simply controlling the electromagnetic valve and the metering plunger pump 5 according to the program by the PLC controller 2, reduces the investment cost in the early stage, meets the requirement of continuously exerting the medicament effect in the oil well shaft, and simultaneously realizes the antifreezing of the medicament adding pipeline by utilizing the low temperature resistance characteristic of the oil-based paraffin remover and controlling the sequence of medicament adding through the program.
The oil field site is usually filled with a medicament once for 5 days due to the limitation of personnel and road conditions, 20L to 30L of medicament is filled once, but a large amount of medicament is filled once to be pumped out of the oil field along with the produced liquid, and the medicament cannot be kept in a shaft for a long time, so that the effect of the medicament is relatively large on the continuous exertion of the medicament efficacy, and the medicament is filled for multiple times every day to ensure that the medicament keeps a certain concentration in the shaft and continuously exerts the medicament efficacy, so that the past large dosage of medicament is required to be converted into daily dosage of the oil field when the dosage is set, but the dosage is required to be filled for multiple times every day and the dosage interval taking the unit of hours is adopted for the convenience of calculation.
The invention greatly simplifies the structure of the dosing device, saves energy consumption, reduces construction cost and ensures reliable operation of the dosing device in winter.
Example six:
according to the injection method of the antifreezing cluster type oil well multi-wellhead double-agent injection system, on the basis of the fifth embodiment, the following formula is adopted for calculating the injection amount of each oil well in the injection interval period in the second step:
and is also provided with
Wherein T is the injection interval period;
h is a constant, which is 24 hours;
d is daily oil well injection dose;
n is the number of wells in the well group;
D Ti the injection amount of the ith oil well in the injection interval period is the sum of the injection amounts of the paraffin removal inhibitor and the hydrogen sulfide inhibitor in the injection interval period.
Further, in the third step, the start-stop time of the metering plunger pump 5 in the oil well injection interval period is t,
t＝D T ×Q
wherein: d (D) T The injection amount of the oil well in the injection interval period is;
q is the pump displacement of the metering plunger pump.
Further, the injection procedure in the fifth step is as follows:
the first step: adding a water-based hydrogen sulfide inhibitor;
the PLC 2 controls the first medicine tank electromagnetic valve 6, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the first oil well 10 to be opened, then the medicine in the first medicine tank 3 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the first oil well 10 through the pipe header 9 and the oil well electromagnetic valve 8 on the first oil well 10, and finally when the starting time of the metering plunger pump 5 is equal to the set time, the PLC 2 controls the metering plunger pump 5 and the oil well electromagnetic valve 8 on the first oil well 10 to be closed; then, the PLC 2 sequentially controls the oil well electromagnetic valve 8 and the metering plunger pump 5 on the second oil well 11 to the last oil well to be opened and closed according to the process, and the water-based hydrogen sulfide inhibitor is added to all the oil wells of the cluster well group according to the set time length;
And a second step of: after the first step is finished, the PLC 2 controls the first medicine tank electromagnetic valve 6, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the last oil well to be closed;
and a third step of: adding wax cleaning and preventing agent
The PLC 2 controls the second medicine tank electromagnetic valve 7, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the first oil well 10 to be opened, the medicine in the second medicine tank 4 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the first oil well 10 through the collecting pipe 9 and the oil well electromagnetic valve 8 on the first oil well 10, finally when the starting time of the metering plunger pump 5 is equal to the set time, the PLC 2 controls the metering plunger pump 5 and the oil well electromagnetic valve 8 on the upper end of the first oil well 10 to be closed, and then the PLC 2 sequentially controls the opening and closing of the oil well electromagnetic valve 8 on the second oil well 11 to the last oil well and the metering plunger pump 5 according to the above process, and the addition of all the oil well paraffin removal and prevention agents of the cluster well group is completed according to the set time;
fourth step: after the third step is completed, the PLC controller 2 controls the second medicine tank electromagnetic valve 7, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the last oil well to be closed.
Fifth step: after the next bolus interval period begins, the first through fourth steps are repeated.
Embodiment seven:
referring to FIG. 1, an injection method of an antifreezing cluster type oil well multi-wellhead double-agent injection system is shown.
The freeze-proof cluster type oil well multi-wellhead double-medicament injection system comprises a remote monitoring platform 1 and a freeze-proof cluster type oil well multi-wellhead double-medicament injection device which are connected through an oil area network, wherein the injection device mainly comprises a PLC (programmable logic controller) 2, a first medicament tank 3, a second medicament tank 4, a metering plunger pump 5, a first medicament tank solenoid valve 6, a second medicament tank solenoid valve 7 and six oil well solenoid valves 8 which are electrically connected with the PLC 2, the first medicament tank 3 is connected with the first medicament tank solenoid valve 6, the second medicament tank 4 is connected with the second medicament tank solenoid valve 7, the first medicament tank solenoid valve 6 and the second medicament tank solenoid valve 7 are connected to a suction inlet of the metering plunger pump 5 through a tee joint, an exhaust outlet of the metering plunger pump 5 is connected with the six oil well solenoid valves 8 through a collecting pipe 9, and the six oil well solenoid valves 8 are correspondingly connected with a first oil well 10, a second well 11, a third well 12, a fourth well 13, a fifth well 14 and a sixth well 15 through medicament adding pipelines.
The first medicine tank electromagnetic valve 6, the second medicine tank electromagnetic valve 7 and the oil well electromagnetic valve 8 are normally closed high-voltage electromagnetic ball valves.
The oil well solenoid valves are in one-to-one correspondence with the corresponding oil wells, such as a first oil well solenoid valve, a second oil well solenoid valve, a third oil well solenoid valve and the like, and so on.
The first medicine tank is filled with a hydrogen sulfide inhibitor, the second medicine tank is filled with an antifreezing paraffin inhibitor, and the hydrogen sulfide inhibitor and the antifreezing paraffin inhibitor do not react chemically when in contact. The hydrogen sulfide inhibitor is a water-based hydrogen sulfide simulator, and the antifreezing paraffin remover is an oil-based paraffin remover.
The remote monitoring platform 1 in the embodiment is a remote control terminal, the remote control terminal is compiled by STEP7 hardware configuration software of Siemens, and operates under a Windows system, and a specific communication mechanism is a Scaset TCP/IP, and the functions of the remote monitoring platform are mainly to monitor the operation state and set automatic dosing parameters.
The PLC2 is a programmable logic controller (Programmable Logic Controller) and is a digital operation controller with a microprocessor for automatic control, and control instructions can be loaded into a memory at any time for storage and execution. The PLC2 adopted by the invention is Siemens S7-200PLC, has the characteristics of high speed in a real-time mode, communication function and higher productivity, and is widely applied to the current various industrial control fields.
It should be noted that, the STEP7 hardware configuration software of Siemens and the Siemens S7-200PLC are both existing products available in the market, belong to the common technology in the field of oil fields, and the specific structure and principle thereof do not belong to the protection scope of the present invention, and are not described in detail herein.
The working process or working principle of the freeze-proof cluster-type oil well multi-wellhead double-medicament injection system is as follows: firstly, the remote monitoring platform 1 calculates and automatically calculates the start-stop time length of the metering plunger pump 5 in the oil well dosing interval period according to the set parameters such as the displacement of the metering plunger pump 5, the dosing interval period and the daily dosing amount of each oil well, and sends the start-stop time length to the PLC controller 2 in the on-site dosing device through the oil area local area network.
The PLC controller 2 programs to start executing the injection program according to the set injection interval period, firstly, the injection of the water-based hydrogen sulfide inhibitor is carried out, the PLC controller 2 controls the first medicine tank electromagnetic valve 6, the metering plunger pump 5 and the oil well electromagnetic valve 8 of the first oil well 10 to be opened, then the medicine in the first medicine tank 3 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the first oil well 10 through the injection pipeline through the oil well electromagnetic valve 8 on the collecting pipe 9 and the first oil well 10, finally, when the starting duration of the metering plunger pump 5 is equal to the set duration, the PLC controller 2 controls the oil well electromagnetic valve 8 of the metering plunger pump 5 and the first oil well 10 to be closed, then the PLC controller 2 sequentially controls the oil well electromagnetic valves 8 and the metering plunger pump 5 on the second oil well 11, the third oil well 12, the fourth oil well 13, the fifth oil well 14 and the sixth oil well 15 to be opened and closed, and finally, and the injection of the water-based hydrogen sulfide inhibitor is completed according to the set duration. After the addition of the water-based hydrogen sulfide inhibitor to the last well No. 15 is completed, the PLC controller 2 controls the first canister solenoid valve 6, the metering plunger pump 5, and the well solenoid valve 8 of No. 15 to close.
Then, the addition of the paraffin remover is started, the PLC 2 controls the solenoid valve 7 of the second medicine tank, the metering plunger pump 5 and the solenoid valve 8 of the first oil well 10 to be opened, then the medicine in the second medicine tank 4 is sucked by the metering plunger pump 5 and is discharged into the oil sleeve annulus of the first oil well 10 through the pipe header 9 and the solenoid valve 8 of the first oil well, finally when the starting time of the metering plunger pump 5 is equal to the set time, the PLC 2 controls the solenoid valves 8 of the metering plunger pump 5 and the first oil well 10 to be closed, then the PLC 2 sequentially controls the solenoid valves 8 and the metering plunger pump 5 of the second oil well 11, the third oil well 12, the fourth oil well 13, the fifth oil well 14 and the sixth oil well 15 to be opened and closed, and the addition of the paraffin remover of the cluster well group oil well is completed according to the set time. After the addition of the clear paraffin inhibitor of the last oil well No. 15 is completed, the PLC 2 controls the second medicine tank electromagnetic valve 7, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the No. 15 oil well to be closed, so that the addition of the water-based hydrogen sulfide inhibitor and the clear paraffin inhibitor in one injection interval period is completed. And after the next injection interval period starts, the injection is carried out on the first oil well 10 to the sixth oil well in sequence of firstly adding the hydrogen sulfide inhibitor and then adding the paraffin remover.
In the above embodiment, during operation, only parameters such as the displacement of the metering plunger pump 5, the injection interval period, daily injection dosage of each oil well and the like are set in the remote monitoring platform 1, and the remote monitoring platform 1 automatically calculates the start-stop time of the metering plunger pump 5 in the two medicament dosing interval periods according to the set parameters and sends the start-stop time to the PLC 2 in the on-site injection device through the oil area local area network. And the PLC controls the electromagnetic valve of the pharmaceutical tank, the metering plunger pump 5 and the electromagnetic valve of the oil well to sequentially open the injection agent for each oil well wheel according to the calculated start-stop time of the metering plunger pump 5 in the injection interval period, and simultaneously fully utilizes the low temperature resistance characteristic of the oil-based paraffin removal and prevention agent, and realizes the anti-freezing and blocking of pipelines by the addition sequence of the hydrogen sulfide inhibitor and the paraffin removal and prevention agent. The invention solves the problems that the existing automatic injection device only has large investment for single-well injection in the early stage and high operation and later maintenance cost, can realize the injection of the small-dose wheel inspection injection of the cluster well group by simply controlling six oil well electromagnetic valves 8 and metering plunger pumps 5 according to the program by using the PLC control 2, reduces the investment cost in the early stage, meets the requirement of continuously exerting the chemical effect in the oil well shaft, simultaneously utilizes the low-temperature resistant characteristic of the oil-based paraffin remover, controls the sequence of adding the chemical by the program, realizes the antifreezing of the chemical adding pipeline, greatly simplifies the structure of the chemical adding device, saves the energy consumption, reduces the construction cost and ensures the reliable operation of the chemical adding device in winter site.
Example eight:
referring to FIG. 2, an injection method of the freeze-proof cluster type oil well multi-wellhead double-agent injection system is shown.
The XX well group is applied with drugs for antifreezing, and the specific parameters are as follows:
(1) 4 oil wells (first oil well, second oil well, third oil well and fourth oil well) are governed under the well field;
(2) Pump displacement: 2L/h;
(3) Type of drug administered: hydrogen sulfide inhibitors and oil-based wax cleaning agents;
(4) Well head medicament addition position: oil well oil jacket annulus;
(5) Injection interval period: 0.5 hours;
(6) Daily dosage of oil well: the daily dosage of the paraffin removal and prevention agents for the first oil well to the fourth oil well is respectively 4L, 4L and 2L, and the dosage of the hydrogen sulfide inhibitor is respectively 2L, 2L and 1L;
(7) The daily start time of the injection is 00:00.
Step one: the displacement of the metering plunger pump 5, the injection interval period and the daily injection dose of each oil well are set on the remote control platform 1, wherein the unit of the injection interval period is hour, and the maximum value is not more than 24.
Step two: calculating the injection amount of each oil well in the injection interval period, which is equivalent to evenly distributing daily injection amount of a single well in the injection interval period, wherein the specific calculation formula is as follows:
wherein DT is the injection amount of the oil well in the injection interval period;
T is the injection interval period;
h is a constant and its value is 24 hours.
D is the daily dose of the well.
The injection amounts of the paraffin remover in the injection interval period of the first oil well to the fourth oil well in the example are respectively 0.0833L, 0.0833L and 0.0417L through calculation. The injection amounts of the hydrogen sulfide inhibitor are respectively 0.0410160L, 0.0410160L and 0.02085L.
The calculation formula is suitable for two medicaments, namely a paraffin removal inhibitor and a hydrogen sulfide inhibitor, but the total injection amount of the well group in the injection interval period needs to meet the following formula, otherwise, the well group cannot finish setting the injection amount of the medicament in the injection interval period.
Wherein n is the number of wells in the well group;
DTi is the injection amount of the ith oil well in the injection interval period, and is the sum of the injection amounts of the paraffin removal inhibitor and the hydrogen sulfide inhibitor in the injection interval period;
q is the pump displacement of the metering plunger pump.
Through calculation, the total injection amount of the hydrogen sulfide inhibitor and the paraffin removal inhibitor in the interval period of 4 oil well injection in the example is 0.4374L less than 2L, and all oil wells can finish the set injection amount.
And (5) calculating the start-stop time of the metering plunger pump 5 in the oil well injection interval period.
t＝D T ×Q
And t is the start-stop time of the metering plunger pump in the oil well dosing interval period.
The calculated start and stop time of the metering plunger pump 5 in the injection interval period of the first oil well to the fourth oil well when the paraffin inhibitor is injected is 75 seconds, 75 seconds and 37 seconds respectively, and the total time is about 5 minutes. The start and stop time of the metering plunger pump 5 in the dosing interval period of the hydrogen sulfide inhibitor is respectively 37 seconds, 37 seconds and 18 seconds, and the total time is about 2.5 minutes.
Step three: the remote monitoring platform 1 calculates and automatically calculates the start-stop time length of the metering plunger pump 5 in the oil well dosing interval period according to the set parameters such as the displacement of the metering plunger pump 5, the dosing interval period and the daily dosing amount of each oil well, and sends the start-stop time length to the PLC controller 2 in the on-site dosing device through the oil area local area network.
Step four: the PLC controller 2 program starts to execute the injection program according to the set injection interval period of 00:00, firstly, the injection of the water-based hydrogen sulfide inhibitor is carried out, the PLC controller 2 controls the opening of the first medicine tank electromagnetic valve 6, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the first oil well 10, then the medicine in the first medicine tank 3 is sucked by the metering plunger pump 5 and is discharged into the oil jacket annulus of the first oil well through the pipe header 9 and the oil well electromagnetic valve 8 on the first oil well, finally, when the starting time of the metering plunger pump 5 is equal to 37 seconds, the PLC controller 2 controls the closing of the metering plunger pump 5 and the oil well electromagnetic valve 8 of the first oil well, then the PLC controller 2 sequentially controls the opening and closing of the oil well electromagnetic valves 8 on the second oil well 11, the third oil well 12 and the fourth oil well 13, and the metering plunger pump 5, and the injection of the cluster oil well water-based hydrogen sulfide inhibitor is completed according to the set time. After the addition of the water-based hydrogen sulfide inhibitor on the last well, i.e., well No. 13, is completed, the PLC controller 2 controls the first canister solenoid valve 6, the metering plunger pump 5, and the well solenoid valve 8 on well No. 13 to close.
Step five: then, the addition of the wax removing and preventing agent is started, the PLC 2 controls the solenoid valve 7 of the second medicine tank, the metering plunger pump 5 and the solenoid valve 8 of the first oil well 10 to be opened, then the medicine in the second medicine tank 4 is sucked by the metering plunger pump 5 and is discharged into the oil sleeve annulus of the first oil well 10 through the pipe header 9 and the solenoid valve 8 of the first oil well 10 through the injection pipeline, finally when the starting time of the metering plunger pump 5 is equal to 75 seconds, the PLC 2 controls the solenoid valves 8 of the metering plunger pump 5 and the first oil well 10 to be closed, then the PLC 2 sequentially controls the solenoid valves 8 of the second oil well 11, the third oil well 12 and the fourth oil well 13 and the metering plunger pump 5 to be opened and closed, and the addition of the wax removing and preventing agent of the cluster well group oil well is completed according to the set time. After the addition of the paraffin removal and prevention agent of the last oil well, namely the fourth oil well 13 is completed, the PLC 2 controls the second medicine tank electromagnetic valve 7, the metering plunger pump 5 and the oil well electromagnetic valve 8 on the fourth oil well 13 to be closed, so that the addition of the water-based hydrogen sulfide inhibitor and the paraffin removal and prevention agent in one injection interval period is completed.
Step six: and (5) repeating the fourth step and the fifth step in the next injection interval period.
In the above embodiment, during operation, only parameters such as the displacement of the metering plunger pump 5, the injection interval period, daily injection dosage of each oil well and the like are set in the remote monitoring platform 1, and the remote monitoring platform 1 automatically calculates the start-stop time of the metering plunger pump 5 in the two medicament dosing interval periods according to the set parameters and sends the start-stop time to the PLC 2 in the on-site injection device through the oil area local area network. The PLC 2 controls the first medicine tank electromagnetic valve 6, the second medicine tank electromagnetic valve 7, the metering plunger pump 5 and the oil well electromagnetic valves 8 on each oil well to sequentially open the injection agent for each oil well wheel according to the calculated start-stop time of the metering plunger pump 5 in the injection interval period, simultaneously fully utilizes the low temperature resistance characteristic of the oil-based paraffin removal and prevention agent, and realizes the anti-freezing and blocking of pipelines through the addition sequence of the hydrogen sulfide inhibitor and the paraffin removal and prevention agent.
The invention solves the problems that the existing automatic injection device only has large investment for single-well injection in the early stage and high operation and later maintenance cost, only needs the PLC 2 to simply control the first medicine tank electromagnetic valve 6, the second medicine tank electromagnetic valve 7 and the metering plunger pump 5 according to the program, realizes the small-dose round injection of the cluster well group-motor-pumped well, reduces the investment cost in the early stage, meets the requirement of continuously exerting the effect of the medicament in the oil well shaft, simultaneously utilizes the low temperature resistance characteristic of the oil-based paraffin remover, controls the sequence of medicament addition through the program, realizes the antifreezing of the medicament adding pipeline, greatly simplifies the structure of the medicament adding device, saves the energy consumption, reduces the construction cost and ensures the reliable operation of the medicament adding device in winter on site.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Under the condition of no conflict, the technical features related to the examples can be combined with each other according to actual situations by a person skilled in the art so as to achieve corresponding technical effects, and specific details of the combination situations are not described in detail herein.
It should be noted that all directional indicators (such as up, down, left, right, front, and rear … …) in the embodiments of the present invention are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture (as shown in the drawings), and if the particular posture is changed, the directional indicator is changed accordingly.
While the invention is susceptible of embodiments in accordance with the preferred embodiments, the invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein. Any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (7)
1. An injection method of an antifreezing cluster type oil well multi-wellhead double-agent injection system is characterized by comprising the following steps of,
step one: the displacement, the injection interval period and the daily injection dosage of each oil well of the metering plunger pump (5) are preset and input to a remote monitoring platform (1);
step two: the remote monitoring platform (1) calculates the injection amount of each oil well in the injection interval period according to the step one;
step three: the remote monitoring platform (1) calculates the start-stop time length of the metering plunger pump (5) in the oil well injection interval period according to the first step and the second step;
step four: the remote monitoring platform (1) sends the result of the calculation in the step two to a PLC (programmable logic controller) 2 in the injection device on the well site;
step five: the PLC (2) starts executing the injection program at the whole point according to the set injection interval period;
the injection procedure in the fifth step is as follows:
the first step: adding a water-based hydrogen sulfide inhibitor;
the PLC (2) controls the first medicine tank electromagnetic valve (6), the metering plunger pump (5) and the oil well electromagnetic valve (8) on the first oil well (10) to be opened, then the medicine in the first medicine tank (3) is sucked by the metering plunger pump (5) and is discharged into the oil jacket annulus of the first oil well (10) through the pipe header (9) and the oil well electromagnetic valve (8) on the first oil well (10) through the injection pipeline, and finally when the starting time of the metering plunger pump (5) is equal to the set time, the PLC (2) controls the metering plunger pump (5) and the oil well electromagnetic valve (8) on the first oil well (10) to be closed; then, the PLC (2) sequentially controls the oil well electromagnetic valve (8) and the metering plunger pump (5) on the second oil well (11) to the last oil well to be opened and closed according to the process, and the water-based hydrogen sulfide inhibitor is added to all the oil wells of the cluster well group according to the set time length;
And a second step of: after the first step is finished, the PLC (2) controls the first medicine tank electromagnetic valve (6), the metering plunger pump (5) and the oil well electromagnetic valve (8) on the last oil well to be closed;
and a third step of: adding wax cleaning and preventing agent
The PLC (2) controls a second medicine tank electromagnetic valve (7), a metering plunger pump (5) and an oil well electromagnetic valve (8) on a first oil well (10) to be opened, medicines in the second medicine tank (4) are sucked by the metering plunger pump (5) and are discharged into an oil jacket annulus of the first oil well (10) through a collecting pipe (9) and the oil well electromagnetic valve (8) on the first oil well (10) through a filling pipeline, finally when the starting time of the metering plunger pump (5) is equal to a set time, the PLC (2) controls the metering plunger pump (5) and the oil well electromagnetic valve (8) at the upper end of the first oil well (10) to be closed, and then the PLC (2) sequentially controls the oil well electromagnetic valve (8) from the second oil well (11) to the last oil well and the metering plunger pump (5) to be opened and closed according to the process, and the addition of all oil well wax removing agents of the cluster well group is completed according to the set time;
fourth step: after the third step is completed, the PLC (2) controls the second medicine tank electromagnetic valve (7), the metering plunger pump (5) and the oil well electromagnetic valve (8) on the last oil well to be closed,
Fifth step: repeating the first to fourth steps after the start of the next injection interval period;
in the second step, the injection amount of each oil well in the injection interval period is calculated by adopting the following formula:
and is also provided with
Wherein T is the injection interval period;
h is a constant, which is 24 hours;
d is daily oil well injection dose;
n is the number of wells in the well group;
D Ti the injection amount of the ith oil well in the injection interval period is the sum of the injection amounts of the paraffin removal inhibitor and the hydrogen sulfide inhibitor in the injection interval period;
in the third step, the starting and stopping time of the metering plunger pump (5) in the oil well injection interval period is t,
t＝D T ×Q
wherein: d (D) T The injection amount of the oil well in the injection interval period is;
q is the pump displacement of the metering plunger pump.
2. The injection method of the antifreeze cluster type oil well multi-wellhead double-agent injection system as claimed in claim 1, wherein: and in the first step, the unit of the injection interval period is hours, and the injection interval period is less than or equal to 24 hours.
3. The injection method of the antifreeze cluster type oil well multi-wellhead double-agent injection system as claimed in claim 1, wherein: the adopted anti-freezing cluster type oil well multi-wellhead double-medicament injection system comprises an anti-freezing cluster type oil well multi-wellhead double-medicament injection device and a remote monitoring platform (1); the remote monitoring platform (1) is in electrical signal connection with a PLC (2) in the anti-freezing cluster type oil well multi-wellhead double-medicament injection device.
4. A method of injection of an antifreeze cluster oil well multi-wellhead dual agent injection system as defined in claim 3, wherein: the antifreezing cluster type oil well multi-wellhead double-medicament injection device comprises a PLC (programmable logic controller) 2, a first medicament tank 3, a second medicament tank 4, a metering plunger pump 5, a first medicament tank electromagnetic valve 6, a second medicament tank electromagnetic valve 7, a plurality of oil well electromagnetic valves 8 and a collecting pipe 9; the oil well electromagnetic valves (8) are respectively connected to corresponding oil wells through chemical adding pipelines; the first medicine tank electromagnetic valve (6) is connected to the first medicine tank (3), and the second medicine tank electromagnetic valve (7) is connected to the second medicine tank (4); the first medicine tank electromagnetic valve (6) and the second medicine tank electromagnetic valve (7) are connected to the suction inlet of the metering plunger pump (5) through a tee joint, and the discharge outlet of the metering plunger pump (5) is respectively connected with the oil well electromagnetic valves (8) on all the oil wells through a collecting pipe (9).
5. The method for injecting the antifreeze cluster type oil well multi-wellhead double-medicament injection system according to claim 4, wherein the method comprises the following steps: the first medicine tank electromagnetic valve (6), the second medicine tank electromagnetic valve (7) and the plurality of oil well electromagnetic valves (8) are all normally closed high-voltage electromagnetic ball valves.
6. The injection method of the antifreeze cluster type oil well multi-wellhead double-medicament injection system as claimed in claim 4 or 5, wherein: the first medicine tank (3) is internally provided with a hydrogen sulfide inhibitor; the second medicine tank (4) is internally provided with an antifreezing paraffin inhibitor.
7. The method for injecting the antifreeze type cluster oil well multi-wellhead double-medicament injection system according to claim 6, wherein the method comprises the following steps: the hydrogen sulfide inhibitor adopts a water-based hydrogen sulfide imitation agent, and the antifreezing paraffin remover adopts an oil-based paraffin remover.
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