A drug delivery device and a production system for oil and gas

Abstract

The application relates to the oil and gas production technical field and provides a medicine injection device and an oil and gas production system. The medicine injection device comprises a medicine injection structure and a circulation structure. The medicine injection structure comprises a medicine outlet end for temporarily storing protective medicine, and the medicine outlet end is communicated with a casing annulus of a collecting device. The circulation structure comprises an air inlet end and an air outlet end which are communicated with each other, the air inlet end is communicated with the casing annulus, the air outlet end is communicated with the medicine outlet end, and the circulation structure further comprises a driving assembly which has a first motion state and a second motion state. When the driving assembly is in the first motion state, the driving assembly can extract gas in the casing annulus, and when the driving assembly is in the second motion state, the extracted gas can flow back to the casing annulus in sequence through the air outlet end and the medicine outlet end. The natural gas leakage and other accidents can be avoided, and the internal environment of the casing annulus cannot be polluted.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of oil and gas production, and particularly relates to a medicine injection device and an oil and gas production system. BACKGROUND

[0002] With the development of oil fields into the middle and late stages, the production and collection devices of oil and gas wells often suffer from chemical corrosion damage. After the collection device is seriously corroded, great safety hazards will be caused, and even the normal production operation of the oil and gas well cannot be carried out. Usually, protective agents are injected into the annulus of the collection device to protect the collection device from serious corrosion. The protective agent contains chemical agent components, and the chemical components will be slowly consumed over time, resulting in a decrease in the corrosion protection effect of the protective agent on the collection device. In order to ensure the corrosion protection effect of the collection device, the related art uses a medicine injection device to inject protective agents into the collection device.

[0003] The medicine injection device in the related art can not only cause environmental pollution in the collection device when injecting the protective agent into the collection device, but also can easily cause a leakage accident of the collection device. SUMMARY

[0004] The present application provides a medicine injection device and an oil and gas production system. When the medicine injection device injects the protective agent into the collection device, the occurrence of a natural gas leakage accident can be avoided, and the purity of the internal environment of the collection device can also be ensured.

[0005] A first aspect of the present application provides a medicine injection device for injecting a protective agent into a collection device, the collection device having a casing annulus for storing the protective agent, comprising:

[0006] a medicine injection structure, the medicine injection structure comprising a medicine outlet end for temporarily storing the protective agent, the medicine outlet end being in communication with the casing annulus of the collection device; and

[0007] a circulation structure, the circulation structure comprising an air inlet end and an air outlet end in communication, the air inlet end being in communication with the casing annulus, the air outlet end being in communication with the medicine outlet end, the circulation structure further comprising a driving assembly, the driving assembly having a first motion state and a second motion state;

[0008] When the driving assembly is in the first motion state, the driving assembly can extract the gas in the casing annulus. When the driving assembly is in the second motion state, the driving assembly can drive the extracted gas to flow back to the casing annulus in sequence through the air outlet end and the medicine outlet end. The protective agent temporarily stored in the medicine outlet end is located on the path of the gas flow.

[0009] When the medicine injection device injects medicine into the collecting device, the driving assembly is opened, and the first movement state of the driving assembly is used to suck the gas in the casing annulus to the circulation structure. After sufficient gas is sucked, the driving assembly is changed to the second movement state. At this time, the driving assembly can drive the sucked gas to flow towards the medicine outlet end. The gas flows from the medicine outlet end to the casing annulus again, and the gas can drive the medicine at the medicine outlet end to move into the casing annulus when passing through the medicine outlet end. In this way, the medicine in the medicine injection structure can be injected into the casing annulus without external gas, avoiding the increase of the internal gas pressure of the casing annulus caused by external gas, and avoiding accidents such as damage of the collecting device and natural gas leakage caused by the increase of the pressure. Moreover, the gas used to transport the medicine in the present application comes from the gas in the casing annulus itself, so that the environment in the casing annulus is not polluted.

[0010] In a possible implementation, the driving assembly comprises a housing and a driving body. The driving body has a first position and a second position relative to the housing. The first movement state is formed by the movement of the driving body from the first position to the second position relative to the housing. The second movement state is formed by the movement of the driving body from the second position to the first position relative to the housing.

[0011] In a possible implementation, the driving body comprises a driving rod movably connected to the housing. The driving rod can move between the first position and the second position. The housing has a gas cavity. The gas cavity is communicated with the gas inlet end and the gas outlet end. One end of the driving rod is located in the gas cavity, and the driving rod is attached to the inner wall of the gas cavity at the end of the gas cavity.

[0012] In a possible implementation, the end of the driving rod at the end of the gas cavity is provided with a pressing head. A sealing ring is arranged on the peripheral wall of the pressing head and attached to the inner wall of the gas cavity.

[0013] In a possible implementation, the housing comprises an outer cylinder. The outer cylinder is provided with a receiving groove. The receiving groove forms the gas cavity. The gas inlet end and the gas outlet end are arranged on the outer cylinder.

[0014] In a possible implementation, one end of the gas cavity is open. A dustproof cap is arranged on the opening end of the gas cavity. The driving rod passes through the dustproof cap.

[0015] In a possible implementation, the housing further comprises a bottom plate. The bottom plate is connected to the outer cylinder.

[0016] In a possible implementation, the gas inlet end is provided with a first one-way valve, which limits the one-way flow of gas in the annulus of the sleeve to the gas inlet end; and the gas outlet end is provided with a second one-way valve, which limits the one-way flow of gas to the gas outlet end.

[0017] In a possible implementation, the drug delivery structure comprises a drug storage box and a drug delivery part, the drug delivery part is connected to the drug storage box, the gas outlet end is arranged in the drug delivery part, and the drug delivery part is arranged in an openable and closable manner; when the drug delivery part is opened, the protective drug in the drug storage box can fall to the gas outlet end through the drug delivery part.

[0018] In a possible implementation, the drug delivery structure further comprises a pressure balance pipe, the pressure balance pipe is connected between the drug storage box and the drug delivery part, a valve is connected between the pressure balance pipe and the drug storage box, and the pressure balance pipe is in communication with the annulus of the sleeve.

[0019] In a possible implementation, an air pipe is arranged between the annulus of the sleeve and the pressure balance pipe, one end of the air pipe is in communication with the annulus of the sleeve, and the other end of the air pipe is in communication with the pressure balance pipe.

[0020] In a possible implementation, a third one-way valve is connected to the air pipe, the air pipe is in communication with the pressure balance pipe through the third one-way valve, and the third one-way valve limits the one-way flow of gas in the annulus of the sleeve to the pressure balance pipe.

[0021] In a possible implementation, a mixing tee is connected to the gas outlet end, and the gas outlet end is in communication with the gas outlet end, the annulus of the sleeve and the gas outlet end through the mixing tee.

[0022] In a possible implementation, a pipeline assembly is further included, the pipeline assembly comprises a plurality of pipelines, the gas inlet end is in communication with the annulus of the sleeve through part of the pipelines, and the gas outlet end is in communication with the gas outlet end through another part of the pipelines.

[0023] In a possible implementation, the pipeline assembly comprises a first gas conveying pipe, one end of the first gas conveying pipe is in communication with the gas inlet end, and the other end of the first gas conveying pipe is directly or indirectly in communication with the annulus of the sleeve; and the pipeline assembly further comprises a second gas conveying pipe, one end of the second gas conveying pipe is in communication with the gas outlet end, and the other end of the second gas conveying pipe is in communication with the gas outlet end.

[0024] The second aspect of the present application provides an oil and gas production system, comprising: a collection device and the drug delivery device.

[0025] In a possible implementation, the collecting device comprises a tubing and a casing pipe, the casing pipe is sleeved outside the tubing, and the casing pipe and the tubing are spaced apart to form an annulus of the casing pipe.

[0026] In a possible implementation, the collecting device further comprises a pipe head connected to the casing pipe and the tubing, the pipe head is provided with a feeding pipe and a gas outlet pipe, one end of the feeding pipe is in communication with the medicine outlet end, the other end of the feeding pipe is in communication with the annulus of the casing pipe, one end of the gas outlet pipe is in communication with the gas inlet end, and the other end of the gas outlet pipe is in communication with the annulus of the casing pipe.

[0027] In a possible implementation, the feeding pipe is provided with at least one first gate to control opening and closing of the feeding pipe, and the gas outlet pipe is provided with at least one second gate to control opening and closing of the gas outlet pipe. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings described below are some embodiments of the present application. Those skilled in the art can obtain other drawings according to these drawings without any creative effort.

[0029] Figure 1 A structural schematic diagram of a collecting device according to some embodiments of the present application is shown;

[0030] Figure 2 A structural schematic diagram of an oil and gas collecting system according to some embodiments of the present application is shown;

[0031] Figure 3 Another structural schematic diagram of an oil and gas collecting system according to some embodiments of the present application is shown;

[0032] Figure 4 A sectional view of a driving assembly according to some embodiments of the present application is shown;

[0033] Figure 5 A structural schematic diagram of a medicine feeding structure according to some embodiments of the present application is shown.

[0034] REFERENCE SIGNS:

[0035] 01 - medicine feeding device;

[0036] 10 - medicine feeding structure; 110 - medicine storage box; 120 - valve; 130 - pressure balance pipe; 140 - third one-way valve;

[0037] 150 - administration part; 151 - administration end; 160 - mixing tee; 170 - administration tube; 180 - vent tube;

[0038] 20 - circulation structure; 210 - driving assembly; 211 - housing; 2111 - outer cylinder; 2112 - air cavity; 2113 - dustproof cap; 2114 - bottom plate; 2115 - air inlet end; 2116 - air outlet end; 212 - driving body; 2121 - driving rod; 2122 - handle; 2123 - pressing head; 2124 - tightening nut; 2125 - sealing ring; 213 - first one-way valve; 214 - second one-way valve; 220 - pipeline assembly; 221 - first gas delivery tube; 222 - second gas delivery tube; 223 - pipeline tee; 224 - second gas delivery tube;

[0039] 223 - pipeline tee; 224 - second gas delivery tube;

[0040] 02 - collection device;

[0041] 30 - casing; 40 - oil pipe; 50 - casing annulus; 60 - pipe head; 610 - feed pipe; 620 - gas outlet pipe; 630 - first gate; 640 - second gate. DETAILED DESCRIPTION

[0042] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the following will be combined with the drawings in the embodiments of the present application to make a clear and complete description of the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0043] Oil and gas exploitation refers to excavating fluid minerals and natural gas and other substances buried deep in the ground to industrial production and daily life, providing energy convenience for people's life. Through advanced technology and artificial means, underground oil and gas is lifted up, filtered and separated through a series of processes, and finally converted into important energy.

[0044] The present application provides an oil and gas production system, which can be used for oil and gas production in oil and gas fields. After the oil and gas field is surveyed, drilling operation is needed for the oil and gas field before the oil and gas field is prepared for exploitation. After drilling is completed, downhole operation can be performed. The oil and gas production system of the present application mainly comprises a collection device 02. The collection device 02 is an important device for downhole operation. When used, it needs to be lowered into the well to assist in collecting oil and gas.

[0045] Specifically, Figure 1 is a structural schematic view of the collection device of the present application. Referring to Figure 1It can be seen that the collecting device 02 comprises the oil pipe 40 and the casing pipe 30, and the casing pipe 30 and the oil pipe 40 are both hollow structures. In order to protect the casing pipe 30 and the oil pipe 40, the casing pipe 30 is sleeved outside the oil pipe 40, and the casing pipe 30 and the oil pipe 40 are arranged at intervals, so that an annular space can be formed between the casing pipe 30 and the oil pipe 40, that is, the casing annulus 50, which is a space for accommodating the protective agent. In use, the combined structure of the casing pipe 30 and the oil pipe 40 is lowered into the well, and the hollow structure of the oil pipe 40 can serve as a channel for oil and gas, which can be transported to the ground through the oil pipe 40.

[0046] It should be noted that the collecting device 02 further comprises a pipe head 60 connected to the casing pipe 30 and the oil pipe 40. The pipe head 60 not only can be used to fix the relative position of the casing pipe 30 and the oil pipe 40, but also can seal the casing annulus 50.

[0047] Please refer to Figure 1 In actual cases, the protective agent does not fill the casing annulus 50, that is, a part of the casing annulus 50 is not filled with the protective agent. Such a setting is to cope with the thermal expansion and contraction of the protective agent. The annular space in the casing annulus 50 without the protective agent filling generally contains a certain amount of natural gas and hydrogen sulfide, and the pressure of the part of the casing annulus 50 without the protective agent filling is relatively large, generally greater than atmospheric pressure.

[0048] If the casing annulus 50 is filled with the protective agent, that is, there is no space for the protective agent in the casing annulus 50, when the temperature rises, the protective agent will expand in the casing annulus 50. At this time, due to the lack of extra expansion space in the casing annulus 50, the pressure in the casing annulus 50 increases, and the protective agent is easily deformed by extrusion of the casing pipe 30 and the oil pipe 40, or even forces the pipe head 60 to separate from the casing pipe 30 or the oil pipe 40, which not only leads to the damage of the whole collecting device 02, but also easily causes natural gas leakage accidents.

[0049] In the related art, a dosing device is connected to the pipe head 60, and the medicine conveying pipeline of the dosing device is communicated with the casing annulus 50 through the medicine conveying channel in the pipe head 60. In order to make the agent in the dosing device enter the casing annulus 50 smoothly, the dosing device in the related art generally needs to be provided with a driving structure, mainly a gas pump. The gas outlet end of the gas pump is communicated with the medicine outlet end of the dosing device. The gas pump sucks gas in the external environment and then delivers the gas to the gas outlet end of the dosing device. Under the action of the flowing gas and gas pressure, the agent at the medicine outlet end can be conveyed into the casing annulus 50.

[0050] However, the drug delivery method in the related art often needs to use external gas, and the external gas is delivered into the casing annulus 50 at the same time as the drug is delivered into the casing annulus 50. As a result, the pressure inside the casing annulus 50 is increased, which is easy to squeeze and deform the casing 30 or the tubing 40, and damage the collection device 02. In addition, if the external gas flows into the casing annulus 50 to cause the pressure in the casing annulus 50 to be too large, or the connection between the pipe head 60, the casing 30 and the tubing 40 is not firm, the pipe head 60 is easy to be separated from the casing 30 and the tubing 40 due to the pressure, and then a gap is generated, and a natural gas leakage accident in the casing annulus 50 is easy to occur.

[0051] Based on the deficiency of the drug delivery device in the related art, the present application provides a drug delivery device 01. The drug delivery device 01 comprises a drug delivery structure 10 and a circulation structure 20. The drug delivery structure 10 is connected to the collection device 02. In particular, the drug outlet end 151 of the drug delivery device 01 is in communication with the casing annulus 50 of the collection device 02, so that the drug stored in the drug delivery device 01 can enter the casing annulus 50 through the drug outlet end 151. In addition, part of the circulation structure 20 of the present application can be in communication with the casing annulus 50, and another part of the circulation structure 20 can be in communication with the drug delivery structure 10. The circulation structure 20 can directly suck the gas in the casing annulus 50, and can deliver the sucked gas to the drug outlet end 151 of the drug delivery structure 10, and then return the gas to the casing annulus 50 through the drug outlet end 151. In this way, the circulation structure 20 of the present application can deliver the drug in the drug outlet end 151 to the casing annulus 50 by driving the flow of the gas, and the gas required for delivering the drug is obtained from the gas in the casing annulus 50, without the need to suck the gas from the outside, thereby avoiding the deficiency of the drug delivery device 01 in the related art.

[0052] Specifically, referring to Figure 2 and Figure 3 , the present application also provides a drug delivery device 01 which can deliver a protective drug into the casing annulus 50 of the collection device 02. The drug delivery device 01 comprises a drug delivery structure 10 and a circulation structure 20. The drug delivery structure 10 is a structure for providing the drug, and comprises a drug outlet end 151 for temporarily storing the protective drug. The drug outlet end 151 is in communication with the casing annulus 50 of the collection device 02. The drug delivery structure 10 generally has a storage structure for storing the drug. Before use, the drug is stored in the storage structure. When the drug needs to be delivered, the drug in the storage structure is released to the drug outlet end 151 for temporary storage, and then the drug is delivered to the casing annulus 50 by the pushing action of the circulation structure 20.

[0053] The circulation structure 20 comprises a gas inlet end 2115 and a gas outlet end 2116 connected to each other, the gas inlet end 2115 is connected to the casing annulus 50, and the gas outlet end 2116 is connected to the drug outlet end 151. The circulation structure 20 can be used for the gas in the casing annulus 50 to circulate between the circulation structure 20, the drug delivery structure 10 and the casing annulus 50.

[0054] It should be noted that the pipe head 60 is provided with a feeding pipe 610 and a gas outlet pipe 620, one end of the feeding pipe 610 is connected to the drug outlet end 151, and the other end of the feeding pipe 610 is connected to the casing annulus 50, one end of the gas outlet pipe 620 is connected to the gas inlet end 2115, and the other end of the gas outlet pipe 620 is connected to the casing annulus 50. In this way, a gas circulation system is formed between the casing annulus 50, the circulation structure 20 and the drug outlet end 151, so that the gas in the casing annulus 50 can circulate.

[0055] In order to ensure the sealing of the collection device 02 during operation, at least one first gate 630 is arranged on the feeding pipe 610 to control the opening and closing of the feeding pipe 610, and at least one second gate 640 is arranged on the gas outlet pipe 620 to control the opening and closing of the gas outlet pipe 620.

[0056] The circulation structure 20 further comprises a driving assembly 210, which can drive the gas in the casing annulus 50 to circulate. The driving assembly 210 has a first movement state and a second movement state, when the driving assembly 210 is in the first movement state, it can extract the gas in the casing annulus 50, when the driving assembly 210 is in the second movement state, it can drive the extracted gas to flow back to the casing annulus 50 through the gas outlet end 2116 and the drug outlet end 151 in turn, and the protective agent temporarily stored in the drug outlet end 151 is located in the path of the gas flow, so that the protective agent in the drug outlet end 151 can be delivered to the casing annulus 50 during the gas flow.

[0057] The two movement states of the driving assembly 210 mainly drive the gas in the casing annulus 50. It can be foreseen that the first movement state of the driving assembly 210 can realize the suction of the gas in the casing annulus 50, and store it in a certain part of the circulation structure 20, and then the second movement state of the driving assembly 210 can realize the discharge of the stored gas towards the drug delivery structure 10, so that the gas flows back to the casing annulus 50 from the drug outlet end 151.

[0058] Therefore, when it is needed to put the medicament into the casing annulus 50, the driving assembly 210 needs to be opened, and the first movement state of the driving assembly 210 can be used to suck the gas in the casing annulus 50 to the circulation structure 20. After enough gas is sucked, the driving assembly 210 is changed to the second movement state, at which time the driving assembly 210 can drive the sucked gas to flow towards the medicament outlet end 151. The gas reflows from the medicament outlet end 151 to the casing annulus 50, and the gas can drive the medicament of the medicament outlet end 151 to move into the casing annulus 50 when passing through the medicament outlet end 151. In this way, the scheme can realize that the medicament in the medicament injection structure 10 can be put into the casing annulus 50 without external gas, so as to avoid the increase of the internal pressure of the casing annulus 50 caused by the external gas, and further avoid the damage of the collection device 02 and the natural gas leakage caused by the increase of the pressure. Since the gas used for transporting the medicament in the scheme comes from the gas in the casing annulus 50 itself, the internal environment of the casing annulus 50 is not polluted.

[0059] The driving assembly 210 mainly plays a role of driving the gas flow. The first movement state and the second movement state of the driving assembly 210 are determined according to the specific structure, and the driving assembly 210 mainly changes the pressure difference in the first movement state and the second movement state to drive the gas flow. For example, when the driving assembly 210 is in the first movement state, the pressure in the structure (i.e., the first gas conveying pipe 221 in the following) connected with the casing annulus 50 can be changed, so that the pressure is less than the pressure in the casing annulus 50, and then the gas in the casing annulus 50 can flow to the circulation structure 20. When the driving assembly 210 is in the second movement state, the pressure in the structure (i.e., the second gas conveying pipe 224 in the following) connected with the medicament outlet end 151 can be changed, so that the pressure is greater than the pressure in the medicament outlet end 151, and then the gas can flow to the medicament outlet end 151, and then flow to the casing annulus 50 from the medicament outlet end 151.

[0060] In an embodiment, referring to Figure 2 and Figure 3 , the driving assembly 210 includes a housing 211 and a driving body 212. The driving body 212 has a first position and a second position relative to the housing 211. The process that the driving body 212 moves from the first position to the second position relative to the housing 211 forms the first movement state of the driving assembly 210. The process that the driving body 212 moves from the second position to the first position relative to the housing 211 forms the second movement state of the driving assembly 210.

[0061] It should be noted that Figure 2 a structural schematic diagram of an oil and gas production system according to some embodiments of the present application is shown, Figure 3 another structural schematic diagram of an oil and gas production system according to some embodiments of the present application is shown, inFigure 2 The structure schematic diagram shows that the driving body 212 is located at the first position relative to the shell 211, and the driving body 212 is located at the second position relative to the shell 211. Figure 3 The structure schematic diagram shows that the driving body 212 is located at the first position relative to the shell 211, and the driving body 212 is located at the second position relative to the shell 211.

[0062] It can be predicted that the first movement state of the driving assembly 210 is that the driving body 212 moves from the first position to the second position along the Y to X direction, and the second movement state of the driving assembly 210 is that the driving body 212 moves from the second position to the first position along the X to Y direction.

[0063] In a preferred embodiment, please combine with Figure 4 The driving body 212 comprises a driving rod 2121 movably connected to the shell 211, the driving rod 2121 has a first position and a second position relative to the shell 211, the driving rod 2121 can move between the first position and the second position, and the driving rod 2121 can change the size of the pressure when moving between the first position and the second position.

[0064] Specifically, the shell 211 further has a gas cavity 2112, the gas cavity 2112 is communicated with the gas inlet end 2115 and the gas outlet end 2116, and the gas inlet end 2115 and the gas outlet end 2116 are arranged close to the same end of the gas cavity 2112. One end of the driving rod 2121 is located in the gas cavity 2112, and the end wall of the driving rod 2121 located at the end of the gas cavity 2112 is attached to the inner wall of the gas cavity 2112, so that the end of the driving rod 2121 and the inner wall of the gas cavity 2112 are sealed. The first position is located at the position of the gas cavity 2112 close to the gas inlet end 2115 and the gas outlet end 2116, and the second position is located at the position of the gas cavity 2112 away from the gas inlet end 2115 and the gas outlet end 2116.

[0065] The driving rod 2121 can be located at the first position or the second position in the initial state. The following will be described by taking the initial position of the driving rod 2121 as an example. When the medicine needs to be injected, the driving rod 2121 is driven to move from the first position to the second position. Because the end wall of the driving rod 2121 is attached to the inner wall of the gas cavity 2112, a sealed space is formed between the end of the driving rod 2121 and the gas cavity 2112, and the sealed space is only communicated with the outside through the gas inlet end 2115 and the gas outlet end 2116. The movement of the driving rod 2121 generates a suction force, which can suck the gas in the annular space 50 into the gas cavity 2112. In order to avoid the gas suction from the gas outlet end 2116, the gas outlet end 2116 needs to be closed during the process.

[0066] When the driving rod 2121 is located at the second position, the gas outlet end 2116 is opened, the gas inlet end 2115 is closed, and then the driving rod 2121 is driven to move from the second position to the first position, at this time, the gas in the gas cavity 2112 flows out from the gas outlet end 2116 under the extrusion of the driving rod 2121, and then flows into the casing annulus 50 through the medicine outlet end 151, thereby achieving the medicine injection.

[0067] By the relative movement of the driving rod 2121 in the gas cavity 2112, the pressure inside the gas cavity 2112 can be changed, thereby realizing the pressure difference between the casing annulus 50 and the gas cavity 2112, the gas in the casing annulus 50 can be sucked into the gas cavity 2112, and the gas in the gas cavity 2112 can be discharged from the gas outlet end 2116. The structure is similar to the structure of a syringe, and the functions of gas suction and gas discharge are realized by pushing and pulling the driving rod 2121.

[0068] In order to increase the sealing performance, a pressing head 2123 can also be arranged at the end of the driving rod 2121 in the gas cavity 2112, the pressing head 2123 is preferably made of silica gel or plastic material, the outer dimension of the pressing head 2123 needs to be consistent with the cross section of the gas cavity 2112, or the size of the pressing head 2123 is slightly larger than the cross section of the gas cavity 2112, in this way, the peripheral wall of the pressing head 2123 can be completely or closely attached to the inner wall of the gas cavity 2112, thereby increasing the air tightness.

[0069] Or a sealing ring 2125 can also be arranged around the peripheral wall of the pressing head 2123, the sealing ring 2125 is arranged on the outer wall of the pressing head 2123, when the pressing head 2123 is located in the gas cavity 2112, the sealing ring 2125 can be closely attached to the inner wall of the gas cavity 2112, in this way, the air tightness between the pressing head 2123 and the inner wall of the gas cavity 2112 can be ensured.

[0070] In a specific embodiment, the shell 211 includes an outer cylinder 2111, the outer cylinder 2111 is provided with a containing groove in a straight line direction, the containing groove forms the gas cavity 2112, and the gas inlet end 2115 and the gas outlet end 2116 are arranged at one end of the outer cylinder 2111. The outer cylinder 2111 is mainly used for forming the gas cavity 2112 and connecting the driving rod 2121, and the shape and size thereof are not required.

[0071] The shape and size of the containing groove for forming the gas cavity 2112 are not limited, and the cross section thereof can be circular or rectangular structure, in the embodiment, the cross section of the gas cavity 2112 is preferably circular.

[0072] The air cavity 2112 is open at one end away from the air inlet end 2115 and the air outlet end 2116, and the end of the driving rod 2121 can be inserted into the air cavity 2112 from the opening. The outer cylinder 2111 is further provided with a dustproof cap 2113 covering the opening end of the air cavity 2112, and the driving rod 2121 passes through the dustproof cap 2113. The provision of the dustproof cap 2113 can prevent foreign matter such as dust and bacteria from the outside from entering the air cavity 2112, so as to avoid pollution of the environment in the air cavity 2112.

[0073] In order to facilitate the use of the circulation structure 20, the shell 211 is further provided with a bottom plate 2114 connected to the outer cylinder 2111 and located at one end of the outer cylinder 2111 away from the opening of the air cavity 2112. The area of the end surface of the bottom plate 2114 facing away from the outer cylinder 2111 needs to be reasonably set, so that the bottom plate 2114 can support the entire outer cylinder 2111 and be placed on the work platform. By providing the bottom plate 2114, the outer cylinder 2111 can be supported to ensure that it can be stably placed on the work platform. Of course, in order to ensure stability, a leg structure or other structure for increasing strength can also be provided on the bottom plate 2114, and in order to ensure the anti-skid performance of the bottom plate 2114, an anti-skid structure such as an anti-skid pattern or a structure with a large friction coefficient (rubber pad) can also be provided on the bottom of the bottom plate 2114.

[0074] In order to more conveniently drive the driving rod 2121, a handle 2122 can also be provided on the driving rod 2121, which is located at one end of the driving rod 2121 away from the pressing head 2123 and detachably connected to the driving rod 2121. Specifically, the end of the driving rod 2121 away from the pressing head 2123 is provided with a connecting part (not shown in the figure), the circumferential dimension of the connecting part is smaller than that of the driving rod 2121, the outer surface of the connecting part is provided with external threads, the handle 2122 can be sleeved on the connecting part, the end of the connecting part away from the driving rod 2121 can protrude from the handle 2122, and a tightening nut 2124 is threadedly connected to the end, which can clamp the handle 2122 between the driving rod 2121 and the tightening nut 2124 to realize the installation of the handle 2122.

[0075] For the sake of labor saving, an elastic member can also be arranged in the air cavity 2112. The elastic member can be a spring or the like. The elastic member can be arranged between the air cavity 2112 at the end away from the opening thereof and the pressing head 2123 of the driving rod 2121. In the initial state, the elastic member can enable the pressing head 2123 to be located at the second position. When the driving rod 2121 is driven to move from the second position to the first position, the elastic member is pressed, and the elastic member generates elastic force to release the driving rod 2121. When the driving rod 2121 is released, the elastic force of the elastic member can force the pressing head 2123 to return to the second position from the first position, so as to realize the automatic return function of the driving rod 2121. In addition, the elastic member can also be sleeved on the driving rod 2121, and the elastic member is located between the pressing head 2123 and the dustproof cap 2113. In this case, the elastic member in the initial state can force the pressing head 2123 to be located at the first position. How to arrange the elastic member is not limited here, and can be determined according to the actual situation.

[0076] It should be noted that the driving assembly 210 is not limited to the structure described above. The outer cylinder 2111 can also be made of elastic materials such as memory metal, rubber or plastic. The outer cylinder 2111 is provided with a sealed air cavity 2112, which is only communicated with the air inlet end 2115 and the air outlet end 2116. The outer cylinder 2111 can be pressed to cause elastic deformation of the outer cylinder 2111, so as to change the size of the space inside the air cavity 2112, and then change the pressure difference. For example, when the outer cylinder 2111 is pressed to reduce the space inside the air cavity 2112, the gas inside the air cavity 2112 can flow out of the air outlet end 2116. When the outer cylinder 2111 is released, the outer cylinder 2111 restores to the original state by using its own elasticity, so as to restore the space inside the air cavity 2112. In this process, the gas in the annular space 50 can be sucked into the air cavity 2112 for the next time of discharge.

[0077] In addition, the outer cylinder 2111 can also be provided with two ends arranged to be relatively movable, and an elastic member is arranged between the two ends. The elastic member can provide driving force for the two relatively movable ends. When pressed, the two movable ends can relatively move to reduce the volume of the air cavity 2112. The elastic force of the elastic member can drive the two movable ends to move away from each other to restore the volume of the air cavity 2112. The reduction and restoration of the volume of the air cavity 2112 can realize the flow of the gas in the annular space 50.

[0078] In an embodiment, please refer to Figure 4, the gas in the gas cavity 2112 needs to be discharged through the gas outlet end 2116, and the gas in the casing annulus 50 needs to be sucked through the gas inlet end 2115. In order to facilitate the closing of the gas inlet end 2115 and the gas outlet end, a first one-way valve 213 is arranged on the gas inlet end 2115, which limits the one-way flow of the gas in the casing annulus 50 to the gas inlet end 2115, and a second one-way valve 214 is arranged on the gas outlet end 2116, which limits the one-way flow of the gas in the gas outlet end 2116 to the drug outlet end 151.

[0079] By arranging the first one-way valve 213, during the movement of the driving rod 2121 from the first position to the second position to suck the gas in the casing annulus 50, the second one-way valve 214 is in a closed state, and the first one-way valve 213 is in an open state, so that only the gas in the casing annulus 50 can be sucked into the gas cavity 2112. When the driving rod 2121 moves from the second position to the first position to discharge the gas in the gas cavity 2112 from the gas outlet end 2116, the first one-way valve 213 is in a closed state, and the second one-way valve 214 is in an open state, so that the gas in the gas cavity 2112 can only be discharged from the gas outlet end 2116.

[0080] In an embodiment, please refer to Figure 1 and Figure 5 The drug delivery structure 10 includes a drug storage box 110 and a drug delivery part 150. The drug storage box 110 has a drug storage space, and the protective drug can be pre-stored in the drug storage space of the drug storage box 110. In order to facilitate the addition of the protective drug in the drug storage box 110, the drug storage box 110 can be provided with an opening, and a dustproof cover can be detachably connected at the opening position. Opening the dustproof cover can realize the addition or replacement of the drug in the drug storage box 110.

[0081] The drug delivery part 150 is connected to the drug storage box 110, and the drug outlet end 151 is arranged on the drug delivery part 150. The drug delivery part 150 can be provided with an opening and closing structure, such as a valve structure, which has an open state and a closed state. When the drug delivery part 150 is in the open state, the protective drug in the drug storage box 110 can fall to the drug outlet end 151 through the drug delivery part 150. When the drug delivery part 150 is in the closed state, the drug in the drug storage box 110 can freely fall to the drug outlet end 151 under the action of gravity. The drug delivery part 150 is equivalent to a switch structure of the drug storage box 110, which can control the drug in the drug storage box 110 to fall to the drug outlet end 151.

[0082] It is worth mentioning that the collection device 02 is inconvenient to add protective agent during operation, so the amount of protective agent added into the casing annulus 50 at one time needs to be sufficient. If the amount is insufficient, the corrosion effect is not ideal, and the collection device 02 may be corroded and damaged before the next time point of adding protective agent. Therefore, the amount of protective agent in the precise quantitative medicine storage box 110 needs to be accurately quantified, or the amount of protective agent added into the casing annulus 50 needs to be accurately quantified.

[0083] For example, the amount of protective agent added at one time can be measured in advance, and then the sufficient amount of protective agent can be stored in the medicine storage box 110. Subsequently, the protective agent in the medicine storage box 110 can be released and added into the casing annulus 50.

[0084] The medicine outlet end 151 needs to be in communication with the gas outlet end 2116 and the casing annulus 50. When the gas in the gas outlet end 2116 flows into the casing annulus 50 through the medicine outlet end 151, the flow of the gas will increase the pressure in the internal space of the medicine outlet end 151. In this way, the medicine in the medicine outlet end 151 is not easy to flow into the casing annulus 50 with the gas, and thus the medicine finally flowing into the casing annulus 50 is more likely to be less than expected.

[0085] In order to solve the above problems, in a preferred embodiment, the medicine adding structure 10 further comprises a pressure balance pipe 130 connected between the medicine storage box 110 and the medicine adding part 150. The medicine in the medicine storage box 110 can freely fall into the pressure balance pipe 130. A valve 120 is connected between the pressure balance pipe 130 and the medicine storage box 110. The communication between the pressure balance pipe 130 and the medicine storage box 110 can be realized by opening and closing the valve 120.

[0086] The pressure balance pipe 130 is in communication with the casing annulus 50, and the pressure in the pressure balance pipe 130 is balanced with the pressure in the casing annulus 50. When transporting the medicine in the casing annulus 50, the driving rod 2121 needs to be driven. When the driving rod 2121 extrudes the gas in the gas cavity 2112 to flow out of the gas outlet end 2116, the flow of the gas is in a whole dynamic state, that is, not only the gas outlet end 2116 has gas flow, but also the gas in the medicine outlet end 151 and the casing annulus 50 can flow under the action of pressure. The gas in the casing annulus 50 can flow into the pressure balance pipe 130 to ensure that the pressure in the pressure balance pipe 130 is equivalent to the pressure in the casing annulus 50. The pressure balance pipe 130 is connected with the medicine adding part 150. When the medicine adding part 150 is in an open state to provide medicine for the medicine outlet end 151, the pressure balance pipe 130 can supplement the gas flow for the medicine outlet end 151, so that the pressure of the medicine outlet end 151 can be balanced with the pressure in the pressure balance pipe 130, and the medicine in the medicine outlet end 151 can smoothly fall and flow into the casing annulus 50 with the gas.

[0087] Specifically, the vent pipe 180 is provided between the casing annulus 50 and the pressure balance pipe 130, one end of the vent pipe 180 is communicated with the casing annulus 50, and the other end of the vent pipe 180 is communicated with the pressure balance pipe 130, and the gas in the casing annulus 50 can enter the pressure balance pipe 130 through the vent pipe 180.

[0088] It is worth noting that because the flow of the gas flow depends on the movement of the driving rod 2121, the flow rate of the gas flow generated in the process is prone to instability, and the relative pressure is also prone to instability. In order to avoid the instability of the pressure in the pressure balance pipe 130, the third one-way valve 140 is connected to the vent pipe 180, and the vent pipe 180 is communicated with the pressure balance pipe 130 through the third one-way valve 140, so as to limit the one-way flow of the gas in the casing annulus 50 to the pressure balance pipe 130 and prevent the backflow of the gas in the pressure balance pipe 130. By providing the third one-way valve 140, the vent pipe 180 is communicated with the pressure balance pipe 130 through the third one-way valve 140, so that the gas flow in the pressure balance pipe 130 cannot backflow to the casing annulus 50 through the vent pipe 180, and the pressure in the pressure balance pipe 130 is stable.

[0089] In order to facilitate the communication between the gas outlet end 2116, the medicine outlet end 151 and the casing annulus 50, the mixing tee 160 is connected to the medicine outlet end 151, and the medicine outlet end 151 is communicated with the gas outlet end 2116 and the casing annulus 50 through the mixing tee 160. For example, the medicine outlet end 151 can be communicated with one of the interfaces of the mixing tee 160, the gas outlet end 2116 can be communicated with one end of the second gas conveying pipe 224, the other end of the second gas conveying pipe 224 is communicated with one of the remaining interfaces of the mixing tee 160, and the feeding pipe 610 of the collection device 02 can be communicated with one end of the medicine conveying pipe 170, and the other end of the medicine conveying pipe 170 can be communicated with the last interface of the mixing tee 160.

[0090] In an embodiment, please refer to Figure 1 and Figure 2 In order to communicate the gas inlet end 2115 and the gas outlet end 2116 of the circulation structure 20 with the medicine injection structure 10 and the casing annulus 50, the circulation structure 20 further comprises a pipeline assembly 220, and the pipeline assembly 220 comprises a plurality of pipelines, and the gas inlet end 2115 is communicated with the casing annulus 50 through part of the pipelines, and the gas outlet end 2116 is communicated with the medicine outlet end 151 through another part of the pipelines. The pipeline assembly 220 provides a flow channel for the transportation of the gas, so that the gas can be circulated smoothly.

[0091] Specifically, the pipeline assembly 220 includes a first gas conveying pipe 221, one end of which is communicated with the gas inlet end 2115, and the other end is directly or indirectly communicated with the sleeve annulus 50, and specifically can be communicated with the gas outlet pipe 620 of the collection device 02. The pipeline assembly 220 further includes a second gas conveying pipe 224, one end of which is communicated with the gas outlet end 2116, and the other end is communicated with the medicine outlet end 151.

[0092] The pressure balance pipe 130 described above is communicated with the sleeve annulus 50 through the vent pipe 180. In order to simplify the pipeline, the pipeline assembly 220 further includes a third gas conveying pipe 222 and a pipeline tee joint 223, one end of the third gas conveying pipe 222 is communicated with the sleeve annulus 50, and the other end is communicated with one of the interfaces of the pipeline tee joint 223. One end of the first gas conveying pipe 221 is communicated with the gas inlet end 2115, and the other end is communicated with the other interface of the pipeline tee joint 223. One end of the vent pipe 180 is communicated with the pressure balance pipe 130, and the other end is communicated with the last interface of the pipeline tee joint 223.

[0093] It should be noted that the models of the feeding pipe 610 and the gas outlet pipe 620 can be different from the models of the medicine conveying pipe 170 and the pipelines of the pipeline assembly 220. At this time, a conversion joint is arranged at the end of the feeding pipe 610 and the gas outlet pipe 620, and the feeding pipe 610 and the medicine conveying pipe 170 and the gas outlet pipe 620 and the pipeline assembly 220 are smoothly connected through the conversion joint.

[0094] In summary, when the medicine injection device 01 is used to inject medicine into the collection device 02, the driving rod 2121 is driven to move away from the gas inlet end 2115 to suck the gas in the sleeve annulus 50 into the gas cavity 2112. In this process, the gas in the sleeve annulus 50 enters the gas cavity 2112 in turn through the third gas conveying pipe 222, the first gas conveying pipe 221, the first one-way valve 213 and the gas inlet end 2115. Then the driving rod 2121 is driven to move towards the gas inlet end 2115, and under the extrusion of the pressing head 2123, the gas in the gas cavity 2112 can be discharged from the gas outlet end 2116. The gas enters the sleeve annulus 50 in turn through the second one-way valve 214, the second gas conveying pipe 224, the medicine outlet end 151 and the feeding pipe 610, so as to realize one cycle of circulation of the gas in the sleeve annulus 50. During the gas circulation process, the medicine of the medicine outlet end 151 can be delivered into the sleeve annulus 50.

[0095] It should be noted that when the medicament is put in, the valve 120 between the medicine storage box 110 and the pressure balance pipe 130 is first opened, and the medicament falls to the pressure balance pipe 130 under the action of gravity; then the first gate 630 and the second gate 640 are opened, and the air tightness of the pipeline and the pipeline connection is checked; after it is determined that there is no air leakage, the medicine delivery pipe 170 is disconnected from the conversion joint, and then the driving rod 2121 is driven to reciprocate in the air cavity 2112, so that the gas in the casing annulus 50 can enter the inside of the circulating structure 20, and the gas originally in the circulating structure 20 (the gas in the hose itself) is driven to flow out from the medicine outlet end 151. By driving the driving rod 2121 to circulate, the gas in the circulating structure 20 and the gas at the medicine outlet end 151 are replaced by the gas in the casing annulus 50. After the replacement is completed, the medicine delivery pipe 170 is reconnected to the conversion joint. Finally, the medicine delivery part 150 is driven to the open state, so that the medicament falls to the medicine outlet end 151, and the reciprocating driving of the driving rod 2121 can realize the delivery of the medicament to the casing annulus 50.

[0096] Because there is a certain amount of natural gas in the casing annulus 50, if the circulating structure 20 is connected to the casing annulus 50, the air in the circulating structure 20 can mix with the natural gas in the casing annulus 50 when the gas is circulated, which can easily cause an explosion accident. Therefore, before the medicament is put in, the above operation steps are needed to exhaust the air in the circulating structure 20, and the gas in the casing annulus 50 is used to replace the gas in the circulating structure 20, so as to prevent the explosion accident.

[0097] In addition, after the medicine is put in, the driving rod 2121 still needs to be driven to move, so as to ensure that the gas in the casing annulus 50 continuously circulates, and then ensure that the medicament at the medicine outlet end 151 can be completely transported to the casing annulus 50, and ensure that the dose of the medicament is not affected.

[0098] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0099] In the description of the present application, it should be understood that the terms "comprising" and "having" and any variations thereof used in the embodiments of the present application are intended to cover the non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units need not be limited to those clearly listed steps or units, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0100] Unless otherwise clearly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium; can be connected inside two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0101] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A dosing device for delivering a protective agent to a collection device, wherein the collection device has a casing annulus for storing the protective agent, characterized in that: include: A drug delivery structure, comprising a drug delivery end for temporarily storing and protecting a drug, wherein the drug delivery end is connected to the casing annulus of the collection device; as well as A circulation structure, the circulation structure includes an air inlet end and an air outlet end that are connected to each other, the air inlet end is connected to the casing annulus, the air outlet end is connected to the medicine outlet end, the air inlet end is provided with a first check valve, the first check valve limits the one-way flow of gas in the casing annulus to the air inlet end, the air outlet end is provided with a second check valve, the second check valve limits the one-way flow of gas at the air outlet end to the medicine outlet end, the circulation structure also includes a drive assembly, the drive assembly has a first motion state and a second motion state; The driving assembly includes a housing and a driving body, wherein the driving body has a first position and a second position relative to the housing, wherein the first motion state is formed when the driving body moves from the first position to the second position relative to the housing, and the second motion state is formed when the driving body moves from the second position to the first position relative to the housing; When the drive assembly is in a first motion state, it can extract the gas in the casing annulus. When the drive assembly is in a second motion state, it can drive the extracted gas to flow back to the casing annulus through the gas outlet end and the medicine outlet end in sequence. The protective agent temporarily stored at the medicine outlet end is located on the path of the gas flow.

2. The drug administration device according to claim 1, characterized in that The driving body includes a driving rod movably connected to the shell, and the driving rod can move between the first position and the second position. The shell has an air cavity, and the air cavity is connected to the air inlet end and the air outlet end. One end of the driving rod is located in the air cavity, and the peripheral wall of the end of the driving rod located in the air cavity is in contact with the inner wall of the air cavity.

3. The drug administration device according to claim 2, characterized in that The driving rod is provided with a pressing head at the end portion of the air cavity. A sealing ring is provided on the peripheral wall of the pressing head, and the sealing ring is fitted to the inner wall of the air cavity.

4. The drug administration device according to claim 2, characterized in that The shell includes an outer cylinder, a receiving groove is formed on the outer cylinder, and the receiving groove forms the air cavity. The air inlet end and the air outlet end are both arranged on the outer cylinder.

5. The drug administration device according to claim 4, characterized in that One end of the air cavity is open, and the outer tube is further provided with a dust cap covering the open end of the air cavity, and the driving rod is passed through the dust cap.

6. The drug administration device according to claim 4, characterized in that The shell further includes a bottom plate connected to the outer cylinder.

7. The drug administration device according to claim 1, characterized in that The drug administration structure includes a drug storage box and a drug administration part. The drug administration part is connected to the drug storage box. The drug discharging end is arranged at the drug administration part. The drug administration part can be opened and closed. When the drug administration part is opened, the protective medicine in the drug storage box can be delivered to the drug discharging end through the drug administration part.

8. The drug administration device according to claim 7, characterized in that The drug administration structure further includes a pressure balancing pipe connected between the drug storage box and the drug administration part, a valve is connected between the pressure balancing pipe and the drug storage box, and the pressure balancing pipe is in communication with the casing annulus.

9. The drug administration device according to claim 8, characterized in that A vent pipe is provided between the casing annulus and the pressure balance pipe, one end of the vent pipe is connected to the casing annulus, and the other end of the vent pipe is connected to the pressure balance pipe.

10. The drug administration device according to claim 9, characterized in that The vent pipe is connected to a third one-flow valve, and the vent pipe is connected to the pressure balance pipe through the third one-flow valve to limit the one-way flow of gas in the casing annulus into the pressure balance pipe.

11. The drug administration device according to claim 7, characterized in that: The medicine outlet end is connected with a mixing tee, and the medicine outlet end is communicated with the gas outlet end and the casing annulus respectively through the mixing tee.

12. The drug administration device according to claim 1, wherein It also includes a pipeline assembly, which includes multiple pipelines. The air inlet end is connected to the casing annulus through some of the pipelines, and the air outlet end is connected to the medicine outlet end through another part of the pipeline.

13. The drug administration device according to claim 12, characterized in that: The pipeline assembly includes a first gas pipe, one end of which is connected to the gas inlet end, and the other end is directly or indirectly connected to the casing annulus. The pipeline assembly also includes a second gas pipe, one end of which is connected to the gas outlet end, and the other end is connected to the medicine outlet end.

14. An oil and gas production system, characterized in that: include: A collection device and a dosing device according to any one of claims 1 to 13.

15. The oil and gas production system according to claim 14, characterized in that: The collection device includes an oil pipe and a casing. The casing is sleeved outside the oil pipe, and the casing and the oil pipe are spaced apart to form the casing annulus.

16. The oil and gas production system according to claim 15, characterized in that: The collection device also includes a pipe head, which is connected to the casing and the oil pipe. A feed pipe and an air outlet pipe are provided on the pipe head. One end of the feed pipe can be connected to the medicine outlet end, and the other end of the feed pipe is connected to the casing annulus. One end of the air outlet pipe can be connected to the air inlet end, and the other end of the air outlet pipe is connected to the casing annulus.

17. The oil and gas production system according to claim 16, characterized in that: At least one first gate is provided on the feed pipe to control the opening and closing of the feed pipe, and at least one second gate is provided on the air outlet pipe to control the opening and closing of the air outlet pipe.

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