Grease injection system

Abstract

The utility model discloses a grease injection system, and belongs to the technical field of oil and gas exploitation, the grease injection system is used for conducting grease injection work on a plurality of valves in fracturing equipment, and the grease injection system comprises a pneumatic pump, a grease injection pressing disc, a gas pipeline, a first control valve, a second control valve and a plurality of grease injection pipelines, the pneumatic pump is communicated with a compressed air source through the gas pipeline, the first control valve is arranged on the gas pipeline, the grease injection pressing disc is used for being matched with an oil barrel, the pneumatic pump and the multiple grease injection pipelines are all connected with the grease injection pressing disc, the pneumatic pump is used for driving the grease injection pressing disc to do linear motion, and the first control valve is arranged on the gas pipeline. One end of the grease injection pipeline is connected with the oil drum to output lubricating grease in the oil drum to the plurality of grease injection pipelines, the other ends of the plurality of grease injection pipelines are connected with the plurality of valves in a one-to-one correspondence manner, and each grease injection pipeline is provided with the second control valve. The grease injection system can solve the problems of low efficiency and high safety risk in the current grease injection maintenance process.

Description

Technical Field

[0001] This application belongs to the field of oil and gas extraction technology, specifically relating to a grease injection system. Background Technology

[0002] Fracturing equipment used in oil and gas extraction includes a large number of valves, and the reliability of these valves directly affects the safety of the fracturing operation. Therefore, regular maintenance of the valves is usually required. Currently, single-unit mobile grease injection pumps are generally used to sequentially inject grease into the valves for maintenance. On the one hand, the grease injection efficiency is low; on the other hand, since the area where the fracturing equipment is located is a high-pressure zone, workers operating in such a high-pressure zone face significant safety risks. Utility Model Content

[0003] The purpose of this application is to provide a grease injection system to solve the problems of low efficiency and high safety risks in the current grease injection maintenance process.

[0004] This application discloses a grease injection system for injecting grease into multiple valves in fracturing equipment. The grease injection system includes a pneumatic pump, a grease injection pressure plate, gas pipelines, a first control valve, a second control valve, and multiple grease injection pipelines.

[0005] The pneumatic pump is connected to a compressed air source through the gas pipeline. The first control valve is installed on the gas pipeline. The grease injection plate is used to cooperate with the oil tank. The pneumatic pump and the multiple grease injection pipelines are all connected to the grease injection plate. The pneumatic pump is used to drive the grease injection plate to make linear motion so as to output the lubricating grease in the oil tank to the multiple grease injection pipelines. The other end of the multiple grease injection pipelines is connected to multiple valves one by one, and each of the grease injection pipelines is provided with a second control valve.

[0006] This application discloses a grease injection system, in which a pneumatic pump is connected to a compressed air source via a gas pipeline, and a first control valve is provided on the gas pipeline. When the first control valve is open, the pneumatic pump operates and drives the grease injection pressure plate to move linearly, thereby using the grease injection pressure plate to press out the lubricating grease from the oil tank and deliver it to multiple grease injection pipelines connected to the pneumatic pump. Since the multiple grease injection pipelines are respectively connected to multiple valves in the fracturing equipment, when the second control valve on the grease injection pipeline is in the open state, the lubricating grease in the grease injection pipeline can be delivered to the corresponding valve, thereby realizing the work of grease injection for multiple valves.

[0007] As described above, the grease injection system disclosed in this application can perform grease injection on multiple valves at the same time, which is relatively efficient. At the same time, since the pneumatic pump can be connected to the valve through the grease injection pipeline, the pneumatic pump and the second control valve on the grease injection pipeline can be set outside the high-pressure area in the well site. Therefore, even if workers need to manually control the pneumatic pump, the first control valve and the second control valve, the safety of the workers can be guaranteed to be relatively high. Attached Figure Description

[0008] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0009] Figure 1 This is a schematic diagram of the grease injection system disclosed in the embodiments of this application.

[0010] Figure label:

[0011] 1-Power skid, 2-First control valve, 3-Grease skid, 4-Pressure regulating valve, 5-Pneumatic pump, 6-Cylinder, 7-Grease injection plate, 8-First pressure transmitter, 9-Output pipeline, 10-Second control valve, 11-Second pressure transmitter, 12-Stop valve, 13-Connection structure, 14-Valve. Detailed Implementation

[0012] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0013] The terms "first," "second," etc., used in the specification and claims of this application are used to distinguish similar objects and not to describe a specific order or sequence. It should be understood that such use of data can be interchanged where appropriate so that embodiments of this application can be implemented in orders other than those illustrated or described herein, and the objects distinguished by "first," "second," etc., are generally of the same class and the number of objects is not limited; for example, a first object can be one or more. Furthermore, in the specification and claims, "and / or" indicates at least one of the connected objects, and the character " / " generally indicates that the preceding and following objects are in an "or" relationship.

[0014] like Figure 1As shown in the figure, this application discloses a grease injection system capable of grease injection for multiple valves 14 in fracturing equipment. The grease injection system includes a pneumatic pump 5, a grease injection pressure plate 7, gas pipelines, a first control valve 2, a second control valve 10, and multiple grease injection pipelines. Of course, the grease injection system may also include other components such as sealing rings required for assembly between components; for the sake of brevity, these will not be described in detail here.

[0015] In this embodiment, the pneumatic pump 5 drives the grease injection plate 7, enabling it to move within the oil drum and squeeze the grease to achieve the purpose of grease output. In this embodiment, using the pneumatic pump 5 as the driving source results in a relatively simple overall structure and relatively high driving efficiency. More specifically, the pneumatic pump 5 is connected to the grease injection plate 7 via a linear cylinder 6. The pneumatic pump 5 drives the linear cylinder 6 to move, which in turn moves the grease injection plate 7. Furthermore, to improve the linear movement accuracy of the grease injection plate 7, the linear cylinder 6 is a double-column linear cylinder 6, meaning that two parallel linear cylinders 6 drive the grease injection plate 7 together, with the grease injection plate 7 positioned between the two linear cylinders 6.

[0016] Therefore, in this embodiment of the application, the pneumatic pump 5 is connected to a compressed air source through a gas pipeline. The compressed air source is used to provide compressed air, which is delivered to the pneumatic pump 5 through the gas pipeline to drive the pneumatic pump 5 to work. At the same time, a first control valve 2 is provided on the gas pipeline to control the opening and closing of the gas pipeline, thereby controlling the start and stop of the pneumatic pump 5. Furthermore, the grease injection plate 7 is used to cooperate with the oil drum. Typically, after the oil drum is opened, the grease injection plate 7 can be inserted into the oil drum through the top opening. Since the grease injection plate 7 can form a relatively tight seal with the inner wall of the oil drum, the air between the grease injection plate 7 and the grease in the oil drum can be discharged under the action of the pneumatic pump 5. After the grease injection plate 7 and the grease are in contact, the pneumatic pump 5 can further work to press out the grease in the oil drum and make the grease injection plate 7 gradually move closer to the bottom of the oil drum. Of course, the pneumatic pump 5 is also connected to multiple grease injection pipelines to transport the pressed grease to the device that needs grease injection through the grease injection pipelines. In this application, the device that needs grease injection is the valve 14 of the fracturing equipment.

[0017] That is, in this embodiment, the pneumatic pump 5 and multiple grease injection lines are all connected to the grease injection plate 7. The pneumatic pump 5 can drive the grease injection plate 7 to make linear motion, so as to output the grease in the oil tank to the multiple grease injection lines. The other end of the multiple grease injection lines is connected to multiple valves 14 one by one. Specifically, the grease injection lines can form a reliable connection with the grease injection port on the valve 14 through a quick-connect coupling or other connection structure 13. Accordingly, in order to further improve the consistency of grease injection, a second control valve 10 is also provided on each grease injection line. Then, when it is necessary to stop grease injection, the first control valve 2 and the second control valve 10 can be closed simultaneously. At the same time as the pneumatic pump 5 is closed, the second control valve 10 ensures that the grease in the grease injection line can be stopped from being delivered to the valve 14 in a timely manner.

[0018] This application discloses a grease injection system, in which a pneumatic pump 5 is connected to a compressed air source via a gas pipeline, and a first control valve 2 is provided on the gas pipeline. When the first control valve 2 is open, the pneumatic pump 5 operates and drives the grease injection pressure plate 7 to move linearly, thereby using the grease injection pressure plate 7 to press out the lubricating grease from the oil tank and deliver it to multiple grease injection pipelines connected to the pneumatic pump 5. Since the multiple grease injection pipelines are respectively connected to multiple valves 14 in the fracturing equipment, when the second control valve 10 on the grease injection pipeline is in the open state, the lubricating grease in the grease injection pipeline can be delivered to the corresponding valve 14, thereby realizing the work of grease injection for multiple valves 14.

[0019] As described above, the grease injection system disclosed in this application embodiment can perform grease injection on multiple valves 14 at the same time, which is relatively efficient. At the same time, since the pneumatic pump 5 can be connected to the valve 14 through the grease injection pipeline, the pneumatic pump 5 and the second control valve 10 on the grease injection pipeline can be set outside the high-pressure area in the well site. Therefore, even if workers need to manually control the pneumatic pump 5, the first control valve 2 and the second control valve 10, the safety of the workers can be guaranteed to be relatively high.

[0020] To further enhance the automation and safety of the grease injection system, the grease injection system disclosed in this application may also include a control device. The pneumatic pump 5, the first control valve 2, and each of the second control valves 10 are all communicatively connected to the control device. Thus, the pneumatic pump 5, the first control valve 2, and the second control valves 10 can be remotely controlled through the control device. On the one hand, this further enhances the automation of the grease injection system. On the other hand, it also allows personnel controlling the grease injection system to stay further away from the well site environment, achieving the goal of safe production.

[0021] Of course, when the grease injection system includes a control device, operators can independently determine whether grease injection is necessary and which valves 14 need to be greased based on their production experience. To further improve the automation and quantification of the grease injection system, in another embodiment of this application, the control device can control the working status of the pneumatic pump 5, the first control valve 2, and each of the second control valves 10 based on the grease injection command. It should be noted that the grease injection command can usually be generated based on the detection data provided by sensors or other devices installed on the valves 14. For example, the grease injection command can be generated based on parameters such as fluid pressure, liquid volume, sand volume, and the last grease injection time at each valve 14. Obviously, when the grease injection system disclosed in the embodiments of this application includes a control device, the grease injection system has the ability to communicate with other intelligent products corresponding to fracturing equipment, such as sensors, thereby making the automation level of well site operations relatively higher.

[0022] Furthermore, although the pneumatic pump 5 is connected to multiple grease injection lines, during the operation of the grease injection system disclosed in this application embodiment, not all multiple grease injection lines need to operate simultaneously. That is, the on / off states of the multiple second control valves 10 can be the same or different. In addition, to prevent the grease injection operation from failing to stop in time when the second control valve 10 malfunctions, a shut-off valve 12 can be further installed downstream of the second control valve 10 in the multiple grease injection lines.

[0023] As described above, the control device can control whether the grease injection work of the corresponding valve 14 continues by controlling the on / off state of the second control valve 10. For this purpose, the grease injection amount can also be determined by parameters such as the driving efficiency of the pneumatic pump 5 and the moving speed of the grease injection plate 7. To further improve the accuracy of the grease injection amount, in a specific embodiment of this application, the grease injection system may also include a metering sensor connected to the control device. The metering sensor can measure the grease injection amount, thereby enabling the control device to obtain the amount of lubricating grease output during the current grease injection process. This ensures that the grease injection amount of each valve 14 is as accurate as possible, preventing grease waste while ensuring a relatively good maintenance effect.

[0024] Specifically, the metering sensor can be a weight sensor, which can be used in conjunction with the oil drum to determine the volume of grease output during the current grease injection process by weighing the oil drum in real time, based on parameters such as the density of the grease.

[0025] In another embodiment of this application, to further improve measurement accuracy, the measurement sensor includes a displacement sensor mounted on the grease injection pressure plate 7. The displacement sensor can determine the volume of grease output during the current grease injection process by measuring the moving distance of the grease injection pressure plate 7. This eliminates interference from the downward pressure acting on the oil drum when the grease injection pressure plate 7 is driven, thereby significantly improving the measurement accuracy of the grease injection quantity. Specifically, the displacement sensor can be a strain gauge type, inductive type, differential transformer type, eddy current type, or Hall effect displacement sensor; this is not limited to these types.

[0026] Meanwhile, when a displacement sensor is used as the metering sensor, the detection value of the displacement sensor can be used to determine whether there is still grease left in the oil drum, so as to facilitate the replacement of the oil drum. Considering that the surfaces facing each other on the bottom of the grease injection plate 7 and the oil drum may not be planar structures, and the detection area of ​​the displacement sensor is usually a point area, in order to prevent the grease injection plate 7 from excessively squeezing the bottom of the oil drum and causing damage, this embodiment of the application also includes a first limit sensor. The first displacement sensor is used to monitor the lower limit of the displacement of the grease injection plate 7. The installation position of the oil drum is fixed, and the specifications of the oil drum equipped with the grease injection plate 7 are usually fixed as well. Therefore, by installing the first limit sensor at a specific position of the cylinder 6 and other devices, the lower limit of the displacement of the grease injection plate 7 can be calibrated. When the grease injection plate 7 moves to the aforementioned lower limit of displacement, the pneumatic pump 5 is controlled to stop driving the grease injection plate 7, and the oil drum replacement is performed.

[0027] During the replacement of the oil drum, the connecting valve of the grease injection pressure plate 7 needs to be opened to allow the space between the grease injection pressure plate 7 and the oil drum to communicate with the space outside the oil drum. This ensures that the grease injection pressure plate 7 can move upward relative to the oil drum and detach from it. To prevent excessive upward displacement of the grease injection pressure plate 7 from damaging other components mounted on it, the grease injection system disclosed in this application may further include a second limit sensor to monitor the upper limit of the displacement of the grease injection pressure plate 7. Similarly, based on the specifications of the oil drum that mates with the grease injection pressure plate 7, the upper limit of the displacement from which the grease injection pressure plate 7 can be determined. Accordingly, by installing the second limit sensor at the corresponding position of components such as the cylinder 6, the upper limit of the displacement of the grease injection pressure plate 7 can be monitored, and the controller stops moving upward when the grease injection pressure plate 7 reaches its upper limit.

[0028] Of course, in this embodiment, the connecting valve on the grease injection plate 7 also needs to be connected to the control device so that when the oil drum needs to be replaced, the connecting valve can be controlled to connect with the outside of the oil drum, thereby filling the oil drum with air and ensuring that the grease injection plate 7 can move upward. Accordingly, in this embodiment, the first limit sensor and the second limit sensor are distributed along the moving direction of the grease injection plate 7, and both are connected to the control device.

[0029] Considering the wide temperature range of the well site distribution, to improve the applicability of the grease injection system, the grease injection pressure plate 7 disclosed in this application embodiment may include a plate body and a heater. The plate body is connected to a pneumatic pump 5, so that the plate body moves linearly within the oil tank under the drive of the pneumatic pump 5. Simultaneously, the heater is located within the plate body. The heater can operate under the drive of energy sources such as electricity and generates heat to heat the plate body, thereby indirectly heating the portion of grease near the plate body in the oil tank. This prevents the grease from solidifying due to low temperature, thus ensuring that grease injection can be carried out normally even in low-temperature environments. Specifically, the heater may include a heating wire, and by rotating the heating wire within the plate body, the heating efficiency and uniformity of the entire plate body can be ensured to be relatively high, thereby ensuring that the grease in contact with any position within the oil tank and on the plate body is heated effectively.

[0030] Accordingly, in this embodiment, the heater is also connected to a control device so that the control device can remotely control the operation of the heater. Specifically, the ambient temperature can be input into the control device by the operator, and the heating power and other operating states of the heater can be controlled by determining whether the ambient temperature meets the heating conditions. Alternatively, the control device can be connected to a temperature sensor or other detection device to obtain the detected value of the ambient temperature, and the heating power of the heater can be controlled accordingly based on the detected value. That is, in this embodiment, the control device is used to control the heating power of the heater based on the temperature information of the working environment of the fracturing equipment. More specifically, when the temperature information is lower than a first set value, the heater is controlled to operate at a first heating power; otherwise, the heater is controlled to stop operating. Further, when the temperature information is lower than a second set value, the heater can be controlled to operate at a second heating power, wherein the first set value is higher than the second set value, and the second heating power is higher than the first heating power.

[0031] As described above, the pneumatic pump 5 can be connected to multiple valves 14 one-to-one through multiple grease injection lines. In this case, in order to prevent the leakage of the grease injection lines from being undetected in time and thus adversely affecting the grease injection work, in a specific embodiment of this application, the grease injection system can also include an output line 9, and the grease injection pressure plate 7 is connected to one end of the output line 9. At the same time, the other end of the output line 9 is connected to multiple grease injection lines through a diversion device, and pressure transmitters are provided on both the output line 9 and the multiple grease injection lines.

[0032] Specifically, the pressure transmitter installed on the output line 9 can be a first pressure transmitter 8, and the pressure transmitters installed on the multiple grease injection lines can be second pressure transmitters 11. In this case, by using the pressure detection value of the first pressure transmitter 8 and the pressure detection values ​​of the multiple second pressure transmitters 11, it can be determined whether there is a leak in the output line 9 and the multiple grease injection lines, so that the personnel can carry out timely maintenance. Correspondingly, each pressure transmitter is also connected to a control device so that the control device can obtain the pressure detection values ​​of the multiple pressure transmitters.

[0033] In the above embodiment, multiple grease injection lines can be connected to the grease injection pressure plate 7 through the output line 9. In this case, a pressure regulating valve 4 can also be set on the output line 9 to adjust the grease injection pressure. This can improve the grease injection efficiency and further reduce the waste of grease.

[0034] In the grease injection system disclosed in the above embodiments of this application, the pneumatic pump 5 can be connected to a compressed air source through a gas pipeline. Typically, the compressed air source can be installed on a skid. Therefore, the grease injection system disclosed in the embodiments of this application also includes a power skid, which is used to provide a driving air source for the pneumatic pump 5. Meanwhile, in order to further improve the working efficiency of the grease injection system, in this embodiment, the number of pneumatic pump 5, grease injection pressure plate 7 and gas pipeline is also at least two. For this purpose, the pneumatic pump 5, grease injection pressure plate 7 and the aforementioned double column cylinder 6 and other devices can also be integrated on another skid to form a grease injection skid. This facilitates the relocation and installation of the grease injection system. Accordingly, in this embodiment, the number of grease injection skids is at least two, and one power skid is used to provide driving gas to at least two grease injection skids at the same time. Specifically, the power skid can be connected to the gas pipeline in each grease injection skid through a connecting pipeline to power the pneumatic pump 5 in each grease injection skid. Accordingly, in each grease injection skid, the gas pipeline, pneumatic pump 5 and grease injection pressure plate 7 are connected one-to-one, and the grease injection pressure plate 7 in each grease injection skid is connected to multiple grease injection pipelines.

[0035] In one specific embodiment of this application, such as Figure 1As shown, one power skid 1 can simultaneously control two grease injection skids 3, and each pneumatic pump 5 in any grease injection skid can simultaneously grease four valves 14. Correspondingly, the power skid can also communicate with a control device, allowing operators to control the grease injection of valves 14 from the local control panel of the power skid 1 or remotely via the control device. When grease injection is required, the system first performs a self-check to determine whether valve 14 is undergoing high-pressure operations such as fracturing or pumping. If valve 14 is in a high-pressure operation state, an alarm will sound, and grease injection will be temporarily suspended. Conversely, if valve 14 is not in a high-pressure operation state, the system identifies the valve 14 requiring grease injection and controls the opening of the first control valve 2 and the corresponding second control valve 10. The pneumatic pump 5 receives air power from the power skid 1 and begins pumping. Additionally, the grease injection pressure can be adjusted via the pressure regulating valve 4.

[0036] As described above, the grease injection system includes a first control valve 2 and a second control valve 10. Optionally, both the first control valve 2 and the second control valve 10 can be gate valves. In another embodiment of this application, the second control valve 10 can be a plug valve, which has the ability to avoid throttling and has a check valve function, thereby improving the grease injection effect. Furthermore, when the grease injection system includes a control device, the first control valve 2 can be an electrically controlled valve, and the second control valve 10 can be an electrically controlled plug valve.

[0037] It should be noted that, in this document, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element. Furthermore, it should be noted that the scope of the methods and apparatuses in the embodiments of this application is not limited to performing functions in the order shown or discussed, but may also include performing functions substantially simultaneously or in the reverse order, depending on the functions involved. For example, the described methods may be performed in a different order than described, and various steps may be added, omitted, or combined. Additionally, features described with reference to certain examples may be combined in other examples.

[0038] The embodiments of this application have been described above with reference to the accompanying drawings. However, this application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A grease injection system for injecting grease into multiple valves in fracturing equipment, characterized in that, The grease injection system includes a pneumatic pump, a grease injection pressure plate, gas lines, a first control valve, a second control valve, and multiple grease injection lines, wherein... The pneumatic pump is connected to a compressed air source through the gas pipeline. The first control valve is installed on the gas pipeline. The grease injection plate is used to cooperate with the oil tank. The pneumatic pump and the multiple grease injection pipelines are all connected to the grease injection plate. The pneumatic pump is used to drive the grease injection plate to make linear motion so as to output the lubricating grease in the oil tank to the multiple grease injection pipelines. The other end of the multiple grease injection pipelines is connected to multiple valves one by one, and each of the grease injection pipelines is provided with a second control valve.

2. The grease injection system according to claim 1, characterized in that, It also includes a control device, in which the pneumatic pump, the first control valve and each of the second control valves are communicatively connected, and the control device is used to control the working state of the pneumatic pump, the first control valve and each of the second control valves based on the grease injection command.

3. The grease injection system according to claim 2, characterized in that, It also includes a metering sensor, which is connected to the control device and is used to measure the amount of grease injected.

4. The grease injection system according to claim 3, characterized in that, The metering sensor includes a displacement sensor, which is mounted on the grease injection platen and is used to measure the movement distance of the grease injection platen.

5. The grease injection system according to claim 4, characterized in that, It also includes a first limit sensor and a second limit sensor, which are distributed along the moving direction of the grease injection platen and are both connected to the control device. The first limit sensor and the second limit sensor are used to monitor the lower limit and upper limit of the displacement of the grease injection platen, respectively.

6. The grease injection system according to claim 2, characterized in that, The grease injection pressure plate is connected to one end of the output pipeline, and the other end of the output pipeline is connected to multiple grease injection pipelines through a diversion device. Each of the output pipelines and multiple grease injection pipelines is equipped with a pressure transmitter, and each pressure transmitter is connected to the control device.

7. The grease injection system according to claim 2, characterized in that, The grease injection plate includes a plate body and a heater. The plate body is connected to the pneumatic pump, and the heater is disposed inside the plate body. The heater is connected to the control device, which is also used to control the heating power of the heater based on temperature information.

8. The grease injection system according to claim 2, characterized in that, The grease injection pressure plate is connected to one end of the output pipeline, and the other end of the output pipeline is connected to multiple grease injection pipelines through a diversion device. The output pipeline is also equipped with a pressure regulating valve, which is used to adjust the grease injection pressure.

9. The grease injection system according to claim 1, characterized in that, The device includes a power skid, and the number of the pneumatic pump, the grease injection pressure plate, and the gas pipeline are all at least two. The power skid is connected to each of the gas pipelines through a connecting pipe. The gas pipelines, the pneumatic pump, and the grease injection pressure plate are connected one-to-one, and each of the grease injection pressure plates is connected to multiple grease injection pipelines.

10. The grease injection system according to claim 1, characterized in that, The second control valve is a plug valve.

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