A pressurized water injection device with drug adding function and use method thereof

Abstract

The present invention relates to the technical field of oil and gas production, and specifically to a booster water injection device with a dosing function and a method for using the device. The booster water injection pump can be used to increase the water injection pressure at the wellhead, thereby improving the water injection pressure and ensuring the injection requirements of each water injection well, solving the problem that the injection pressure from the high-pressure water injection pipeline at the front end of the water injection network to the end of the water injection well is insufficient, resulting in water not being injected into the formation and serious under-injection. At the same time, the booster water injection device of the present invention has the function of collecting leaked liquid in the booster water injection pump, and can dosing at the same time, and can inject the liquid after dosing back into the liquid outlet pipeline for unified injection into the well. Therefore, when the booster water injection device of the present invention is used, there is no liquid leakage and no pollution to the environment. The liquid storage tank of the present invention realizes the internal circulation of the liquid and can realize stirring after adding the agent, thus saving the cumbersome process of existing dosing and saving time and labor.

Description

Technical Field

[0001] The invention relates to the technical field of oil and gas production, and in particular to a pressurized water injection device with a drug adding function and a use method thereof. Background Art

[0002] Changqing Oilfield adopts the "injection before production" process. With the development of oilfield production and construction, if there is no corresponding oil displacement energy supplement, the reservoir pressure will gradually decrease with continuous development, resulting in a decrease in the final recovery rate of the oilfield. The injection pressure rises quickly, the pressure and output of the production wells decrease quickly, and the efficiency of water injection oil production is very low, which is the "no injection, no production" that restricts the development of the oilfield. High-pressure water injection technology is an effective way to solve the problems of insufficient injection and failure to inject. Through water injection in the oilfield, the energy of the oilfield can be supplemented, the reservoir pressure can be maintained, and the purpose of stable production of the oilfield can be achieved. However, the injection pressure required for different mining layers is different. If a unified water injection network pressure is adopted, it cannot meet the requirements of high-pressure water injection wells while meeting the injection pressure of most injection wells; if the pressure of the entire network is increased, pressure reduction equipment needs to be added at the low-pressure water injection wellhead, resulting in energy waste. Using a booster water injection pump for water injection wells that are higher than the system pressure is one of the effective measures to increase the injection of water injection wells and improve system efficiency. The site needs an unmanned oilfield water injection wellhead booster device with a long maintenance cycle to increase the water injection pressure by 5-8MPa at the wellhead, thereby ensuring the injection requirements of each water injection well.

[0003] In order to overcome the problems of insufficient water injection pressure from the front-end high-pressure water injection pipeline to the end of the water injection well, failure of water injection into the formation, serious under-injection, affecting the normal development of the oil field caused by the development of oil field production and construction, unreasonable design and layout of the water injection pipeline network in the ground area, head loss along the pipeline network, and high formation pressure in the water injection well, the present invention provides a booster water injection device with a dosing function and a method for using the same. Summary of the invention

[0004] The present invention overcomes the deficiencies of the prior art and provides a pressurized water injection device with a dosing function and a method for using the device, which is particularly characterized by wide application, reliable use, and convenient transportation.

[0005] The technical problem solved by the present invention can be achieved by adopting the following technical solutions:

[0006] A booster water injection device with a dosing function comprises a water supply unit, a booster water injection unit, a leakage liquid recovery unit and a liquid outlet unit, wherein one end of the water supply unit is connected to an external water supply pipeline, and the other end is connected to the water inlet end of the booster water injection unit through a pipeline, the water outlet end of the booster water injection unit is connected to one end of the liquid outlet unit, and the other end of the liquid outlet unit extends into a station well, the booster water injection unit is also connected to a leakage liquid recovery unit for collecting leakage liquid, the other end of the leakage liquid recovery unit is connected to the liquid outlet unit, and a dosing mechanism is also provided on the leakage liquid recovery unit.

[0007] A pressurized water injection device with a drug adding function also includes a control unit, which is respectively connected to a water supply unit, a pressurized water injection unit, a leaked liquid recovery unit and a liquid outlet unit by electrical signals.

[0008] Furthermore, the water supply unit includes an inlet pipeline and an overflow pipeline, both of which are connected to an external water supply pipeline, the other end of the inlet pipeline is connected to the water inlet end of the booster injection unit, and the other end of the overflow pipeline is connected to the liquid outlet unit, and a one-way valve is connected to the overflow pipeline.

[0009] Furthermore, an electric valve, a filter and an inlet pressure gauge are sequentially connected to the pipeline connecting the liquid inlet pipeline and the boost water injection unit, and the electric valve and the inlet pressure gauge are respectively connected to the control unit via electrical signals.

[0010] Furthermore, the boost water injection unit is a boost water injection pump, which includes a boost cylinder body, a boost cylinder seal and a boost motor. A boost pump temperature indicator is installed on the boost cylinder body. The boost cylinder seal is connected to the leakage liquid recovery unit through a leakage liquid collection pipeline. The boost motor and the boost pump temperature indicator are respectively connected to the control unit via electrical signals.

[0011] Furthermore, the leakage liquid recovery unit includes a liquid storage tank, a first pipeline and a second pipeline. The water inlet of the liquid inlet end of the liquid storage tank is connected to the leakage liquid collection pipeline. The first pipeline and the second pipeline are respectively connected in parallel at the liquid outlet end of the liquid storage tank. The water outlet end after the first pipeline and the second pipeline are connected in parallel is connected to the liquid outlet unit by a junction pipe. The first pipeline is located at the upper part of the liquid outlet end of the liquid storage tank, and the second pipeline is located at the lower part of the liquid outlet end of the liquid storage tank, and a plunger pump is connected to the second pipeline.

[0012] Furthermore, a third stop valve is connected to the merging pipe, a first stop valve is connected to the first pipeline, and the second stop valve is arranged on the pipeline between the liquid storage tank and the plunger pump. The plunger pump is also connected to the control unit via an electrical signal.

[0013] Furthermore, a liquid level gauge and a filter plate are provided inside the liquid storage tank at the water inlet end, the liquid level gauge is provided close to the water inlet end of the liquid storage tank, the filter plate is provided at the rear end of the liquid level gauge, a mixing pipeline is also connected to the first pipeline, the mixing pipeline is located inside the liquid storage tank, and a vent is also provided on the liquid storage tank.

[0014] Furthermore, the liquid outlet unit comprises a liquid outlet pipeline, the liquid outlet pipeline is equipped with a one-way valve and an outlet pressure gauge, and the outlet pressure gauge is connected to the control unit via an electrical signal.

[0015] Furthermore, the control unit is a controller, which includes a control panel and a PLC control module. The control panel includes a button for executing power-on operation instructions and a human-machine interface for setting and displaying parameters. The buttons for operation instructions and the human-machine interface for setting parameters are both electrically connected to the PLC control module.

[0016] A method for using a pressurized water injection device with a dosing function, comprising the following method:

[0017] The pressure value of the liquid outlet unit is set to P by the control unit;

[0018] The control unit controls the water supply unit to start and deliver the liquid in the external water supply pipeline to the pressurized water injection unit for pressurization until the pressure value of the liquid outlet unit is P;

[0019] The pressurized liquid is transported to the station well through the liquid outlet unit;

[0020] The leaked liquid of the booster injection unit is recovered by the leaked liquid recovery unit, and then the recovered leaked liquid is transported to merge with the liquid transported by the liquid outlet unit, and then transported together to the station well;

[0021] When it is necessary to add chemicals to the transported liquid, the chemicals are directly added to the leakage liquid recovery unit through the dosing mechanism on the leakage liquid recovery unit, and then the recovered leakage liquid with the added chemicals is transported to merge with the liquid transported by the liquid outlet unit, and then transported together to the station well.

[0022] Furthermore, a method for using a pressurized water injection device with a dosing function also includes the following method:

[0023] When the pressure value of the liquid outlet unit is less than P, the control unit controls the pressurized water injection unit to increase the injection volume, so that the pressure value of the liquid outlet unit reaches the P value or P is greater than 0.5-2MPa. At this time, the control unit controls the pressurized water injection unit to maintain the current injection volume;

[0024] The liquid storage volume of the leakage liquid recovery unit is set to L through the control unit;

[0025] When the control unit monitors that the liquid storage volume of the leakage liquid recovery unit is greater than L, the control unit controls to increase the liquid discharge volume of the leakage liquid recovery unit; when the control unit monitors that the liquid storage volume of the leakage liquid recovery unit is less than L, the liquid discharge pipeline of the leakage liquid recovery unit discharges normally;

[0026] The upper limit temperature of the boost water injection unit is set to T by the control unit;

[0027] When the control unit monitors that the temperature of the boosting and water injection unit reaches or exceeds the upper limit temperature T, the control unit controls the water supply unit to stop supplying water.

[0028] The beneficial effects of the present invention are:

[0029] Compared with the prior art, the present invention can increase the injection pressure at the wellhead through the use of a booster injection pump, thereby improving the injection pressure and ensuring the injection requirements of each injection well, and solving the problem that the injection pressure of the high-pressure injection pipeline at the front end of the water injection network to the end of the water injection well is insufficient, resulting in water injection failure into the formation and serious under-injection; at the same time, the booster injection device of the present invention has the function of collecting the leaked liquid in the booster injection pump, and can add medicine at the same time, and can inject the liquid after adding medicine back into the liquid outlet pipeline for unified injection into the well, so there is no liquid leakage when using the booster injection device of the present invention, and no pollution to the environment will be generated, the liquid storage tank of the present invention realizes the internal circulation of the liquid and can realize stirring after adding the medicine, saving the cumbersome process of the existing medicine adding, saving time and labor; the booster injection device of the present invention has a long maintenance period, and meets the demand for an oilfield water injection wellhead booster device that can work normally without supervision, and the injection pressure can be increased by 5-8MPa at the wellhead, thereby ensuring the injection requirements of each water injection well. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0031] Figure 1 It is a schematic diagram of the overall pipeline connection structure of the present invention.

[0032] Figure 2 It is a schematic diagram of the overall pipeline liquid flow structure during normal operation of the present invention.

[0033] Figure 3 This is a schematic diagram of the liquid flow structure of the pressurized water injection device of the present invention when adding medicine and mixing.

[0034] Figure 4 This is a schematic diagram of the liquid flow structure of the pressurized water injection device of the present invention after the addition and mixing are completed.

[0035] In the figure: 1-controller, 2-boosting water injection pump, 3-liquid storage tank, 4-plunger pump, 5-equipment skid room;

[0036] 1.1- outlet pressure gauge, 1.2- inlet pressure gauge, 1.3- booster pump temperature indicator;

[0037] 2.1-liquid inlet pipeline, 2.2-electric valve, 2.3-filter, 2.4-boost cylinder body, 2.5-boost cylinder seal, 2.6-boost motor, 2.7-liquid outlet pipeline, 2.8-overflow pipeline;

[0038] 3.1-Leakage liquid collection pipeline, 3.2-Liquid level meter, 3.3-Filter plate, 3.4-Dosing port, 3.5-Mixing pipeline, 3.6-Ventilation port;

[0039] 4.1-first stop valve, 4.2-second stop valve, 4.3-first pipeline, 4.4-second pipeline, 4.5-third stop valve. DETAILED DESCRIPTION

[0040] Below, the technical solution of a pressurized water injection device with a dosing function and a method of using the same provided by the embodiment of the present invention will be described in detail through several specific embodiments.

[0041] Reference Figure 1 As shown, a pressurized water injection device with a dosing function includes a water supply unit, a pressurized water injection unit, a leakage liquid recovery unit and a liquid outlet unit. One end of the water supply unit is connected to an external water supply pipeline, and the other end is connected to the water inlet end of the pressurized water injection unit through a pipeline. The water supply unit in the present invention can control the switch of the liquid in the external water supply pipeline entering the pressurized water injection unit, and can monitor the water supply pressure of the supplied water. The external water supply pipeline transports the liquid to the pressurized water injection unit through the water supply unit for pressurization. The water outlet end of the pressurized water injection unit is connected to one end of the liquid outlet unit, and the other end of the liquid outlet unit extends to the station field In the well, the pressurized water can directly enter the station well, wherein the pressure of the pressurized injected liquid must meet the pressure requirement in the station well. The pressurized water injection unit is also connected to a leakage liquid recovery unit for collecting leakage liquid. The leakage liquid recovery unit can collect the leakage liquid in the pressurized water injection unit to avoid liquid leakage and environmental pollution. At the same time, it can also perform liquid reinjection function. The other end of the leakage liquid recovery unit is connected to the liquid outlet unit. The leakage liquid recovery unit is also provided with a dosing mechanism, which can add chemicals to the liquid in the leakage liquid recovery unit and realize the circulation stirring function.

[0042] Reference Figure 1 As shown, a pressurized water injection device with a dosing function also includes a control unit, wherein the control unit is electrically connected to the water supply unit, the pressurized water injection unit, the leakage liquid recovery unit and the liquid outlet unit, respectively, and the control unit is used to control the switch for transporting liquid in the water supply unit, control the pressurization intensity of the pressurized water injection unit, control the liquid reinjection of the leakage liquid recovery unit, and monitor the temperature of the pressurized water injection unit and the liquid outlet pressure of the liquid outlet unit.

[0043] Reference Figure 2 As shown, when the booster water injection device of the present invention operates normally, the liquid flow direction and principle are as follows:

[0044] When liquid needs to be injected into the well of the station, the boosting water injection device of the present invention is started, and the liquid enters the boosting water injection unit through the water supply unit for boosting, and the pressurized liquid is discharged through the outlet of the boosting water injection unit, and is injected into the well after entering the liquid outlet unit. The leakage liquid in the boosting water injection unit collected by the leakage liquid recovery unit is merged with the liquid outlet unit through the leakage liquid recovery unit discharge end and injected into the well together. The dosing mechanism on the leakage liquid recovery unit can add chemicals to the inside of the leakage liquid recovery unit, and the leakage liquid recovery unit discharge end can realize the back injection of liquid, realize the internal mixing circulation of the chemicals, and then discharge it and inject it into the well together with the liquid of the boosting water injection unit. The dosing mechanism in the present invention is the dosing port 3.4 on the leakage liquid recovery unit, and the dosing port 3.4 is provided with a sealing cover that can be opened and closed. The purpose of setting the sealing cover is to avoid leakage of liquid during internal mixing circulation.

[0045] Reference Figure 1 As shown, the water supply unit in the present invention includes an inlet pipeline 2.1 and an overflow pipeline 2.8, both of which are connected to an external water supply pipeline, the other end of the inlet pipeline 2.1 is connected to the water inlet end of the booster injection unit, and the other end of the overflow pipeline 2.8 is connected to the liquid outlet unit. The inlet pipeline 2.1 is used to transport the liquid in the external water supply pipeline to the booster injection unit, and a one-way valve is connected to the overflow pipeline 2.8. The overflow pipeline 2.8 is used as a spare pipeline. When the entire device is under maintenance, the pipeline can be opened to inject liquid into the station well. The one-way valve on the overflow pipeline 2.8 is used to prevent the liquid in the well from flowing back to the inlet end.

[0046] Reference Figure 1 As shown, the pipeline connecting the liquid inlet pipeline 2.1 and the pressurized water injection unit in the present invention is connected with an electric valve 2.2, a filter 2.3 and an inlet pressure gauge 1.2 in sequence. The electric valve 2.2 and the inlet pressure gauge 1.2 are respectively connected with the control unit by electrical signals. The electric valve 2.2 on the liquid inlet pipeline 2.1 is used to control the opening or closing of the liquid inflow. At the same time, the electric valve can be intelligently controlled to reduce manual operation and save manpower. The filter 2.3 is used to filter impurities in the liquid to avoid clogging in the unit after entering the pressurized water injection unit. The inlet pressure gauge 1.2 is used to display and monitor the liquid inlet pressure on the liquid inlet pipeline 2.1, which is convenient for pressure control of the entire device. The control unit controls the opening and closing of the electric valve 2.2 and monitors the pressure value of the inlet pressure gauge 1.2.

[0047] Reference Figure 1As shown, the booster water injection unit in the present invention is a booster water injection pump 2, which includes a booster cylinder body 2.4, a booster cylinder seal 2.5 and a booster motor 2.6, wherein the booster water injection pump 2 of the present invention is an existing product, and the existing booster water injection pump 2 is provided with a sealing section, and the booster cylinder seal 2.5 in the present invention is the sealing section, and the sealing section has leakage liquid, and a booster pump temperature indicator 1.3 is installed on the booster cylinder body 2.4, and the booster pump temperature indicator 1.3 is used to monitor the working temperature of the booster cylinder body 2.4. When the critical temperature required by the product is exceeded, the booster pump temperature indicator 1.3 is used to monitor the working temperature of the booster cylinder body 2.4. When the temperature reaches the critical point, it is necessary to stop the boosting work and continue working after the temperature drops. Long-term high-temperature work may cause damage to the boosting water injection pump 2. The boosting cylinder seal 2.5 is connected to the leakage liquid recovery unit through the leakage liquid collection pipeline 3.1. The boosting motor 2.6 and the boosting pump temperature indicator 1.3 are respectively connected to the control unit by electrical signals. The control unit controls and monitors the temperature of the boosting pump temperature indicator 1.3 and the frequency of the boosting motor 2.6 on the boosting water injection pump 2, that is, controls the frequency of the inverter in the boosting motor 2.6, thereby controlling the boosting intensity of the boosting water injection pump 2.

[0048] Reference Figure 1 As shown, the leakage liquid recovery unit in the present invention comprises a liquid storage tank 3, a first pipeline 4.3 and a second pipeline 4.4. The liquid storage tank 3 is a cylindrical tank body, one end of which is a liquid inlet end, and the other end is a liquid outlet end. The water inlet of the liquid inlet end of the liquid storage tank 3 is connected with the leakage liquid collection pipeline 3.1. The leakage liquid in the booster cylinder seal 2.5 is transported to the liquid storage tank 3 through the leakage liquid collection pipeline 3.1. The first pipeline 4.3 and the second pipeline 4.4 are respectively connected in parallel to the liquid outlet end of the liquid storage tank 3. The water outlet end of the first pipeline 4.3 and the second pipeline 4.4 after being connected in parallel is connected with the liquid outlet unit by a confluence pipe, wherein the first pipeline 4.3 is used for liquid The second pipeline 4.4 is used to discharge the liquid in the liquid storage tank 3 to merge with the pipeline of the liquid outlet unit and inject it into the well of the station. The first pipeline 4.3 is located at the upper part of the liquid outlet end of the liquid storage tank 3 to facilitate the internal circulation of the liquid after reinjection. The second pipeline 4.4 is located at the lower part of the liquid outlet end of the liquid storage tank 3 to facilitate the external discharge of the internal liquid. The second pipeline 4.4 is connected to the plunger pump 4, which is used to accelerate the external discharge of the liquid in the liquid storage tank 3 and keep it consistent with the pressure of the liquid in the pipeline of the liquid outlet unit, thereby ensuring that the pressure entering the well will not change and meet the needs of the well.

[0049] Reference Figure 1As shown, the confluence pipe in the present invention is connected with a third stop valve 4.5, and the third stop valve 4.5 is used to open or close when adding medicine to the liquid in the liquid storage tank 3. The first pipeline 4.3 is connected with a first stop valve 4.1, and the first stop valve 4.1 is used to open or close when liquid reinjection is required. The second stop valve 4.2 is arranged on the pipeline between the liquid storage tank 3 and the plunger pump 4, and the second stop valve 4.2 is used to control the connection and closing of the pipeline between the liquid storage tank 3 and the plunger pump 4. The plunger pump 4 is also connected to the control unit by electrical signals, and the plunger pump 4 is controlled to start or stop by the controller.

[0050] Reference Figure 1 As shown, a liquid level gauge 3.2 and a filter plate 3.3 are arranged at the water inlet end inside the liquid storage tank 3 in the present invention. The liquid level gauge 3.2 is arranged close to the water inlet end of the liquid storage tank 3, and the filter plate 3.3 is arranged at the rear end of the liquid level gauge 3.2. The purpose is to avoid affecting the liquid level monitoring of the liquid level gauge after adding the agent. The liquid level gauge 3.2 can accurately measure the internal liquid level value. A mixing pipeline 3.5 is also connected to the first pipeline 4.3. The mixing pipeline 3.5 is located inside the liquid storage tank 3. The mixing pipeline 3.5 in the present invention is a pipeline extending to the inside of the liquid storage tank 3 and can sink to the bottom of the tank. A plurality of vertically connected pipelines are vertically connected to the pipeline. The aperture of the pipeline can be smaller, and the reinjected liquid can be sprayed out, so that the liquid in the liquid storage tank 3 can circulate and rotate inside, which plays a role in fully mixing the agent. A vent 3.6 is also arranged on the liquid storage tank 3, which is used to discharge when evaporation or gas is generated in the liquid storage tank 3 to ensure that the interior is in a normal pressure state.

[0051] Reference Figure 1 As shown, the liquid outlet unit in the present invention includes a liquid outlet pipeline 2.7, and the liquid outlet pipeline 2.7 is installed with a one-way valve and an outlet pressure gauge 1.1, wherein the one-way valve is used to prevent the backflow of the liquid, and the outlet pressure gauge 1.1 is used to monitor the pressure of the liquid entering the well at the entire outlet. The outlet pressure gauge 1.1 is connected to the control unit by electrical signals, and the pressure gauge is monitored and controlled by the control unit.

[0052] The control unit in the above embodiment is controller 1. It should be noted that the controller 1 in the present invention belongs to the prior art. The controller 1 includes a control panel and a PLC control module. The control panel includes a button for executing power-on operation instructions and a human-machine interface for setting and displaying parameters. The buttons for operation instructions and the human-machine interface for setting parameters are both connected to the PLC control module by electrical signals. The controller 1 of the present invention adopts Kunlun Tongtai's human-machine interface controller TPC1262H. At the same time, the present invention is not limited to the controller of this brand. As long as the controller in the prior art can realize the functions of the present invention, it belongs to the protection scope of the present invention. The internal program in the present invention also belongs to the prior art.

[0053] All equipment pipelines in the pressurized water injection device of the present invention are skid-mounted in the equipment skid-mounted room 5 for easy transportation.

[0054] A method for using a pressurized water injection device with a dosing function of the present invention comprises the following method:

[0055] According to the injection pressure requirement in the station well, the pressure value of the liquid outlet unit is set to P in the control unit;

[0056] The control unit controls the water supply unit to start and deliver the liquid in the external water supply line to the booster injection unit for pressurization, until the pressure value of the liquid outlet unit is P, and the controller controls the booster injection unit to stop further pressurization and maintain the current pressure value;

[0057] The pressurized liquid is transported to the station well through the liquid outlet unit;

[0058] The leaked liquid of the booster injection unit is recovered by the leaked liquid recovery unit. When the liquid in the leaked liquid recovery unit reaches the maximum capacity, the controller controls to increase the liquid discharge volume of the leaked liquid recovery unit, and then transports the recovered leaked liquid to merge with the liquid transported by the liquid outlet unit, and then transports them together to the station well;

[0059] When it is necessary to add chemicals to the transported liquid, the chemicals are directly added to the leakage liquid recovery unit through the dosing mechanism on the leakage liquid recovery unit, and then the recovered leakage liquid with the added chemicals is transported to merge with the liquid transported by the liquid outlet unit, and then transported together to the station well.

[0060] The booster water injection device and the use method of the present invention increase the water injection pressure, and at the same time, no liquid is discharged, and the environment will not be polluted. At the same time, the booster water injection device of the present invention has an added drug adding function, which saves the cumbersome process of existing drug adding and saves time and labor.

[0061] The method for using the pressurized water injection device with a dosing function of the present invention also includes the following method:

[0062] When the pressure value of the liquid outlet unit is less than P, the control unit controls the pressurized water injection unit to increase the injection volume, so that the pressure value of the liquid outlet unit reaches the P value or P is greater than 0.5-2MPa. At this time, the control unit controls the pressurized water injection unit to maintain the current injection volume; in actual field use, the P value is usually equal to 1 and is within the normal value range;

[0063] The liquid storage volume of the leakage liquid recovery unit is set to L through the control unit;

[0064] When the control unit monitors that the liquid storage volume of the leakage liquid recovery unit is greater than L, the control unit controls to increase the liquid discharge volume of the leakage liquid recovery unit; when the control unit monitors that the liquid storage volume of the leakage liquid recovery unit is less than L, the liquid discharge pipeline of the leakage liquid recovery unit discharges normally;

[0065] The upper limit temperature of the boost water injection unit is set to T by the control unit;

[0066] When the control unit detects that the temperature of the booster injection unit reaches or exceeds the upper limit temperature T, the control unit controls the water supply unit to stop supplying water. The present invention uses a controller to realize intelligent control and save manpower. At the same time, it monitors the use limit of the equipment and stops the use of the equipment in time to extend the service life of the entire device.

[0067] Reference Figure 2 and Figure 3 As shown, when the booster water injection device of the present invention is operating normally and when adding and mixing, the liquid flow direction and principle are as follows:

[0068] During normal operation:

[0069] The first stop valve 4.1 in the boost water injection device is in a long closed state, and the other valves are open; the liquid in the liquid inlet pipeline 2.1 enters the boost water injection pump 2 for pressurization after being filtered by the electric valve 2.2 and the filter 2.3, and the pressurized liquid enters the liquid outlet pipeline 2.7 through the discharge port of the boost water injection pump 2. The outlet pressure gauge 1.1 on the liquid outlet pipeline 2.7 displays the current pressure value of the liquid in the pipe. At this time, the controller displays the pressure value at this time. When the pressure value meets the pressure value set in the controller, the controller controls the boost water injection pump 2 to stop pressurizing, but maintain the power of the current boost motor 2.6 for normal injection. When it is less than the set pressure value, it is necessary to continue to increase the power of the boost motor 2.6 for continued pressurization until the set pressure is met. When the pressure is too high, it is necessary to reduce the power of the boost motor 2.6 until the set pressure is met.

[0070] During this period, the leaked liquid in the boost cylinder seal 2.5 on the boost water injection pump 2 is transported to the liquid storage tank 3 through the leaked liquid collecting pipeline 3.1. The liquid level gauge 3.2 in the liquid storage tank 3 monitors the maximum capacity liquid level in the tank body. When the liquid level is greater than the maximum storage volume L, which is the maximum liquid level of the liquid level gauge 3.2, the controller controls the plunger pump 4 on the second pipeline 4.4 to open, increase the displacement of the liquid in the liquid storage tank 3, and when the liquid level does not reach the maximum liquid level of the liquid level gauge 3.2, normal discharge is carried out through the second pipeline 4.4. The liquid merges with the liquid at the discharge port of the boost water injection pump 2 and enters the liquid outlet pipeline 2.7. At this time, the control needs to always observe whether the pressure value on the outlet pressure gauge 1.1 meets the requirements, and adjust the power of the boost motor 2.6 according to the above different situations.

[0071] When adding and mixing:

[0072] The controller needs to be adjusted to manual control, the booster injection pump 2 performs normal booster injection, the third stop valve 4.5 in the leakage liquid recovery unit is in a closed state, and the other valves are opened; the dosing port 3.4 on the liquid storage tank 3 is opened, the agent is added, and the sealing cover on the upper part is covered. The second stop valve 4.2 is in a normally open state, the first stop valve 4.1 is opened, and the plunger pump 4 is started. The liquid in the liquid storage tank 3 enters the first pipeline 4.3 through the second pipeline 4.4, and then the liquid in the first pipeline 4.3 enters the mixing pipeline 3.5 in the liquid storage tank 3. The mixing pipeline 3.5 sprays the liquid so that the liquid storage tank 3 performs internal circulation flow to stir and mix the agent. After stirring, the plunger pump 4 is closed.

[0073] Reference Figure 4 As shown, the flow direction and principle of the liquid after the mixing of the medicine in the booster water injection device of the present invention are as follows:

[0074] On the basis of the above-mentioned mixing of the added drugs, close the first stop valve 4.1, open the third stop valve 4.5, start the plunger pump 4, and inject the liquid added with the drug in the liquid storage tank 3 into the liquid outlet pipeline 2.7 and into the well together with the liquid at the discharge port of the booster injection pump 2.

[0075] In the method of using the boosting water injection device of the present invention, when the controller monitors that the frequency Hz of the frequency converter in the boosting water injection pump 2 is greater than 50 Hz, and the outlet pressure gauge 1.1 on the liquid outlet pipeline 2.7 still does not reach the set pressure value, the controller needs to control the electric valve 2.2 on the liquid inlet pipeline 2.1 to close and stop the boosting liquid injection. It is necessary to check whether the water supply pressure in the external water supply pipeline meets the water supply pressure requirement. If not, the water supply pressure needs to be increased.

[0076] The above is a detailed description of the embodiments of the present invention in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Within the knowledge scope of ordinary technicians in the field, various changes can be made without departing from the purpose of the present invention, which are all within the protection scope of this technology.

[0077] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0078] The technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in the field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A pressurized water injection device with a dosing function, characterized in that: It includes a water supply unit, a booster water injection unit, a leakage liquid recovery unit and a liquid outlet unit. One end of the water supply unit is connected to an external water supply pipeline, and the other end is connected to the water inlet end of the booster water injection unit through a pipeline. The water outlet end of the booster water injection unit is connected to one end of the liquid outlet unit, and the other end of the liquid outlet unit extends into the station well. The booster water injection unit is also connected to a leakage liquid recovery unit for collecting leakage liquid. The other end of the leakage liquid recovery unit is connected to the liquid outlet unit, and a dosing mechanism is also provided on the leakage liquid recovery unit; It also includes a control unit, which is electrically connected to the water supply unit, the pressurized water injection unit, the leaked liquid recovery unit and the liquid outlet unit; The water supply unit comprises a liquid inlet pipeline (2.1) and an overflow pipeline (2.8), the liquid inlet pipeline (2.1) and the overflow pipeline (2.8) are both connected to an external water supply pipeline, the other end of the liquid inlet pipeline (2.1) is connected to the water inlet end of the booster injection unit, the other end of the overflow pipeline (2.8) is connected to the liquid outlet unit, and the overflow pipeline (2.8) is connected to a one-way valve; An electric valve (2.2), a filter (2.3) and an inlet pressure gauge (1.2) are sequentially connected to the pipeline connecting the liquid inlet pipeline (2.1) and the boost water injection unit, and the electric valve (2.2) and the inlet pressure gauge (1.2) are respectively connected to the control unit via electrical signals; The booster water injection unit is a booster water injection pump (2), the booster water injection pump (2) comprising a booster cylinder body (2.4), a booster cylinder seal (2.5) and a booster motor (2.6), a booster pump temperature indicator (1.3) being mounted on the booster cylinder body (2.4), the booster cylinder seal (2.5) being connected to a leakage liquid recovery unit via a leakage liquid collection pipeline (3.1), and the booster motor (2.6) and the booster pump temperature indicator (1.3) being respectively connected to a control unit via electrical signals; When liquid needs to be injected into the well of the station, the booster water injection device is started, and the liquid enters the booster water injection unit through the water supply unit for boosting, and the boosted liquid is discharged through the outlet of the booster water injection unit, and then enters the liquid outlet unit and is injected into the well. The leaked liquid in the booster water injection unit collected by the leaked liquid recovery unit is merged with the liquid outlet unit through the leaked liquid recovery unit discharge end and then injected into the well together. The dosing mechanism on the leaked liquid recovery unit can add chemicals to the inside of the leaked liquid recovery unit, and the leaked liquid recovery unit discharge end can realize the liquid back injection, realize the internal mixing circulation of the chemicals, and then discharge it and inject it into the well together with the liquid of the booster water injection unit. The dosing mechanism is the dosing port (3.4) on the leaked liquid recovery unit, and a sealing cover that can be opened and closed is provided on the dosing port (3.4). The purpose of providing the sealing cover is to avoid leakage of liquid during the internal mixing circulation; The leakage liquid recovery unit comprises a liquid storage tank (3), a first pipeline (4.3) and a second pipeline (4.4); the water inlet of the liquid inlet end of the liquid storage tank (3) is connected to the leakage liquid collection pipeline (3.1); the first pipeline (4.3) and the second pipeline (4.4) are respectively connected in parallel to the liquid outlet end of the liquid storage tank (3); the water outlet end of the first pipeline (4.3) and the second pipeline (4.4) after being connected in parallel is connected to the liquid outlet unit by a confluence pipe; the first pipeline (4.3) is located at the upper part of the liquid outlet end of the liquid storage tank (3); the second pipeline (4.4) is located at the lower part of the liquid outlet end of the liquid storage tank (3); and the second pipeline (4.4) is connected to a plunger pump (4); A liquid level gauge (3.2) and a filter plate (3.3) are provided at the water inlet end of the liquid storage tank (3); the liquid level gauge (3.2) is provided close to the water inlet end of the liquid storage tank (3); the filter plate (3.3) is provided at the rear end of the liquid level gauge (3.2); a mixing pipeline (3.5) is further connected to the first pipeline (4.3); the mixing pipeline (3.5) is located inside the liquid storage tank (3); and a vent (3.6) is further provided on the liquid storage tank (3).

2. The pressurized water injection device with a dosing function according to claim 1 is characterized in that: The merging pipe is connected to a third stop valve (4.5), the first pipeline (4.3) is connected to a first stop valve (4.1), and the second stop valve (4.2) is arranged on the pipeline between the liquid storage tank (3) and the plunger pump (4), and the plunger pump (4) is also connected to the control unit via an electrical signal.

3. The pressurized water injection device with a dosing function according to claim 1 is characterized in that: The liquid outlet unit comprises a liquid outlet pipeline (2.7), the liquid outlet pipeline (2.7) is equipped with a one-way valve and an outlet pressure gauge (1.1), and the outlet pressure gauge (1.1) is electrically signal-connected to the control unit.

4. A pressurized water injection device with a dosing function according to any one of claims 2 to 3, characterized in that: The control unit is a controller (1), and the controller (1) comprises a control panel and a PLC control module. The control panel comprises a button for executing a power-on operation instruction and a human-machine interface for setting and displaying parameters. The button for the operation instruction and the human-machine interface for setting parameters are both connected to the PLC control module by electrical signals.

5. The method for using the pressurized water injection device with a dosing function according to claim 4 is characterized by: Including the following methods, The pressure value of the liquid outlet unit is set to P by the control unit; The control unit controls the water supply unit to start and deliver the liquid in the external water supply pipeline to the pressurized water injection unit for pressurization until the pressure value of the liquid outlet unit is P; The pressurized liquid is transported to the station well through the liquid outlet unit; The leaked liquid of the booster injection unit is recovered by the leaked liquid recovery unit, and then the recovered leaked liquid is transported to merge with the liquid transported by the liquid outlet unit, and then transported together to the station well; When it is necessary to add chemicals to the transported liquid, the chemicals are directly added to the leakage liquid recovery unit through the dosing mechanism on the leakage liquid recovery unit, and then the recovered leakage liquid with the added chemicals is transported to merge with the liquid transported by the liquid outlet unit, and then transported together to the station well.

6. The method for using the pressurized water injection device with a dosing function according to claim 5 is characterized by: Also includes the following methods, When the pressure value of the liquid outlet unit is less than P, the control unit controls the pressurized water injection unit to increase the injection volume, so that the pressure value of the liquid outlet unit reaches the P value or P is greater than 0.5-2MPa. At this time, the control unit controls the pressurized water injection unit to maintain the current injection volume; The liquid storage volume of the leakage liquid recovery unit is set to L through the control unit; When the control unit monitors that the liquid storage volume of the leakage liquid recovery unit is greater than L, the control unit controls to increase the liquid discharge volume of the leakage liquid recovery unit; when the control unit monitors that the liquid storage volume of the leakage liquid recovery unit is less than L, the liquid discharge pipeline of the leakage liquid recovery unit discharges normally; The upper limit temperature of the boost water injection unit is set to T by the control unit; When the control unit monitors that the temperature of the boosting and water injection unit reaches or exceeds the upper limit temperature T, the control unit controls the water supply unit to stop supplying water.

Images