Dynamic monitoring system for horizontal water injection wells

Abstract

The present invention provides a horizontal water injection well dynamic monitoring system, including a water injection well and a dynamic monitoring device arranged in the water injection well; the water injection well includes a well body structure and a Christmas tree, the well body structure is arranged below the Christmas tree, the well body structure includes casing and oil pipe, the casing and the oil pipe are connected to the Christmas tree, the oil pipe is arranged in the casing, the oil pipe includes a vertical section, a curved section and a horizontal section, the curved section is arranged between the vertical section and the horizontal section; the dynamic monitoring device is arranged in the oil pipe, the dynamic monitoring device includes a test instrument and a power parachute fixedly connected to the test instrument, the cross-sectional area of ​​the power parachute is larger than the cross-sectional area of ​​the test instrument, and under the drive of the driving device, the power parachute drives the test instrument to move from the vertical section to the horizontal section. The system of the present invention is not easy to get stuck when the test instrument is placed in the horizontal section of the horizontal water injection well, and can effectively reduce the production cost of the construction unit.

Description

Technical Field

[0001] The invention relates to oil and gas well production technology, and in particular to a horizontal water injection well dynamic monitoring system. Background Art

[0002] In the process of oil and gas extraction, as the extraction progresses, the energy of the oil and gas well formation continues to decay. In order to ensure the smooth progress of extraction, certain measures need to be taken to maintain the formation energy. Among them, water injection is an important means for oil and gas wells to maintain formation pressure, accelerate recovery speed, and improve recovery rate. When using water injection to maintain formation energy, it is necessary to carry out corresponding dynamic monitoring work. By monitoring the corresponding parameters, it is possible to judge whether the injected water has entered the designed layer, whether the expected oil recovery effect has been achieved, whether the injection plan is reasonable, etc.

[0003] In the prior art, dynamic monitoring of the water injection process is generally achieved by placing a test instrument into the water injection well and using the test instrument to monitor relevant parameters during the water injection process. For a horizontal water injection well, the test instrument cannot rely on gravity to enter the horizontal section of the horizontal water injection well. At this time, an external force is required to place the test instrument into the horizontal section of the horizontal water injection well. In the prior art, a crawling robot is generally used to assist the test instrument in moving to the horizontal section of the horizontal water injection well. The specific method is: fix the test instrument on the crawling robot, and then place the crawling robot into the oil pipe so that it drives the test instrument into the horizontal section of the horizontal water injection well.

[0004] However, since some impurities will inevitably remain in the oil pipes during the production process of oil and gas wells, the crawling robot is very likely to get stuck when passing through this section; in addition, the manufacturing cost of the crawling robot itself is expensive, which increases the production cost of the construction unit. Summary of the invention

[0005] In order to overcome the above-mentioned defects of the prior art, the purpose of the present invention is to provide a dynamic monitoring system for horizontal water injection wells. The system of the present invention is not prone to jamming when the test instrument is placed in the horizontal section of the horizontal water injection well, and can effectively reduce the production cost of the construction unit.

[0006] The present invention provides a dynamic monitoring system for a horizontal water injection well, comprising a water injection well and a dynamic monitoring device arranged in the water injection well; the water injection well comprises a well body structure and an oil tree, the well body structure is arranged below the oil tree, the well body structure comprises a casing and an oil pipe, both the casing and the oil pipe are connected to the oil tree, the oil pipe is arranged in the casing, the oil pipe comprises a vertical section, a curved section and a horizontal section, the curved section is arranged between the vertical section and the horizontal section; the dynamic monitoring device is arranged in the oil pipe, the dynamic monitoring device comprises a test instrument and a power parachute fixedly connected to the test instrument, the cross-sectional area of ​​the power parachute is larger than the cross-sectional area of ​​the test instrument, and under the drive of a driving device, the power parachute drives the test instrument to move from the vertical section to the horizontal section.

[0007] In the horizontal water injection well dynamic monitoring system as described above, optionally, the power parachute is fixedly connected to the testing instrument by means of a threaded connection.

[0008] In the horizontal water injection well dynamic monitoring system as described above, optionally, the center line of the power parachute coincides with the center line of the testing instrument.

[0009] In the horizontal water injection well dynamic monitoring system as described above, optionally, the power parachute is fixed to the upper part, middle part or lower part of the testing instrument.

[0010] In the horizontal water injection well dynamic monitoring system as described above, optionally, the cross-section of the power parachute is circular, square or triangular.

[0011] In the horizontal water injection well dynamic monitoring system as described above, optionally, the paramotor is a rubber paramotor, a resin paramotor or a metal paramotor.

[0012] In the above-mentioned dynamic monitoring system for horizontal water injection wells, optionally, the Christmas tree includes a water injection pipeline and a test pipeline connected to the oil pipe, and a return water pipeline connected to the casing.

[0013] As for the horizontal water injection well dynamic monitoring system as described above, optionally, the driving device includes a water injection station and a water injection pump for controlling the water injection intensity of the water injection station, the water injection station is connected to the water injection pipeline, and the water injection pump is arranged on the water injection pipeline.

[0014] As described above, the dynamic monitoring system for horizontal water injection wells, optionally, the dynamic monitoring device further comprises a controller, the controller is connected to the testing instrument via a testing cable, and the testing cable is connected to the testing instrument via the testing pipeline.

[0015] As described above, in the dynamic monitoring system for horizontal water injection wells, optionally, the return water pipeline is connected to a wastewater collection device.

[0016] The horizontal water injection well dynamic monitoring system provided by the present invention comprises a water injection well and a dynamic monitoring device arranged in the water injection well; the water injection well comprises a well body structure and an oil tree, the well body structure is arranged below the oil tree, the well body structure comprises a casing and an oil pipe, the casing and the oil pipe are both connected to the oil tree, the oil pipe is arranged in the casing, the oil pipe comprises a vertical section, a curved section and a horizontal section, the curved section is arranged between the vertical section and the horizontal section; the dynamic monitoring device is arranged in the oil pipe, the dynamic monitoring device comprises a test instrument and a power parachute fixedly connected to the test instrument, the cross-sectional area of ​​the power parachute is larger than the cross-sectional area of ​​the test instrument, and under the drive of the driving device, the power parachute drives the test instrument to move from the vertical section to the horizontal section. The present invention connects the power parachute to the test instrument, the cross-sectional area of ​​the power parachute is larger than the cross-sectional area of ​​the test instrument, and under the drive of the driving device, the force acting on the power parachute is greater than the force directly acting on the test instrument, so that the driving force of the driving device acting on the test instrument can be greatly enhanced through the power parachute, thereby driving the test instrument to move from the vertical section to the horizontal section. When using the system of the present invention, the driving force applied by the driving device can be increased so that the test instrument is not easily stuck when placed in the horizontal section of the water injection well, and the use of a powered parachute instead of a crawling robot can effectively reduce the production cost of the construction unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A simplified structural diagram of a horizontal water injection well dynamic monitoring system provided by one embodiment of the present invention;

[0019] Figure 2 A simplified structural diagram of a wellbore structure provided by an embodiment of the present invention;

[0020] Figure 3 A simplified structural diagram of a Christmas tree provided in one embodiment of the present invention;

[0021] Figure 4 A simplified structural diagram of a dynamic monitoring device provided by an embodiment of the present invention;

[0022] Figure 5 A simplified structural diagram of a powered parachute provided in one embodiment of the present invention;

[0023] Figure 6 A simplified structural diagram of a driving device provided in one embodiment of the present invention.

[0024] Reference numerals:

[0025] 100- water injection well; 110- well structure;

[0026] 111-casing; 1111-perforation section;

[0027] 112-oil pipe; 1121-vertical section;

[0028] 1122- curved section; 1123- horizontal section;

[0029] 120- Christmas tree; 121- water injection pipeline;

[0030] 1211-production valve; 122-test pipeline;

[0031] 1221-test valve; 123-return line;

[0032] 1231-Casing valve; 200-Dynamic monitoring device;

[0033] 210-testing equipment; 220-powered parachute;

[0034] 2201-via; 230-test cable;

[0035] 240-controller; 310-water injection station;

[0036] 320-Water injection pump. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments.

[0038] Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention. In the absence of conflict, the following embodiments and features in the embodiments can be combined with each other.

[0039] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0040] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] It should be noted that in the description of the present invention, the terms "first" and "second" are only used to facilitate the description of different components, and cannot be understood as indicating or implying a sequential relationship, relative importance, or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features.

[0042] Petroleum is a complex mixture of gaseous, liquid and solid hydrocarbon compounds existing in nature and a small amount of impurities. After being generated in the earth's crust, oil and gas exist in a dispersed state in the source layer, and then migrate into the reservoir and gather in the geological layer with good preservation conditions to form oil and gas reservoirs. Oil production is the process of excavating and extracting oil from the reservoir where oil is stored. The reservoir has a storage space that allows oil and gas to pass through. The reservoir space includes pores between rock fragments, cracks in rock fractures, and holes formed by dissolution. The size, distribution and connectivity of the voids in the reservoir space affect the flow of oil and gas, thereby determining the characteristics of oil and gas production.

[0043] During the oil extraction process, oil and gas usually flow from the reservoir into the bottom of the well, then rise from the bottom of the well to the wellhead, and then flow from the wellhead into the oil gathering station. After separation and dehydration, the oil and gas flow into the oil and gas transmission terminal and are transferred out of the mining area.

[0044] Oil production can be roughly divided into three stages:

[0045] Primary oil recovery usually relies on natural energy such as rock expansion, edge water drive, gravity, and natural gas expansion. This stage mainly uses natural energy to lift the oil in the reservoir through the oil pipe to the outside of the well. However, with the continuous production of crude oil and natural gas, the volume of the fluid in the oil layer rock and formation gradually expands, and the elastic energy is gradually released. The average oil recovery rate in this stage is only 15-20%.

[0046] Secondary oil recovery mainly increases the pressure of the oil layer through water injection, gas injection and other methods, so that the oil well can continue to produce oil after the oil well stops spraying. Among them, water injection production is to inject water into the oil reservoir through a special injection well to maintain or restore the oil layer pressure, so that the oil reservoir forms a strong driving force to increase the production rate and recovery rate of the oil reservoir; gas injection production mainly uses the viscosity reduction, expansion, miscibility, molecular diffusion and other effects of the injected gas to reduce interfacial tension, increase permeability, and thus increase the oil field recovery rate. Due to the heterogeneity of the formation, the injected fluid usually flows to the oil well along the path with less resistance, while the oil in the area with relatively large resistance and some oil adsorbed by the rock still cannot be produced, so the recovery rate of the secondary oil recovery stage is still limited.

[0047] Tertiary oil recovery mainly uses various physical and chemical methods to change the viscosity of crude oil and its adsorption to rocks, thereby increasing the flow capacity of crude oil and further improving the recovery rate of crude oil. Tertiary oil recovery methods mainly include thermal oil recovery, chemical oil recovery, miscible oil recovery, microbial oil recovery, etc. Among them, thermal oil recovery mainly uses the method of reducing crude oil viscosity to increase recovery rate. Steam stimulation is a commonly used thermal oil recovery method. It injects a certain amount of steam into the oil well and diffuses the heat energy of the steam into the oil layer, thereby greatly reducing the viscosity of the crude oil and improving the flowability of the crude oil; chemical flooding mainly increases the viscosity of formation water, changes the viscosity ratio of crude oil and formation water, reduces the gap between the flowability of water and oil in the formation, and reduces the adsorption of crude oil to rocks to improve oil recovery efficiency by injecting chemicals; miscible flooding mainly injects natural gas, carbon dioxide and other gases to mix with crude oil, thereby reducing the viscosity of crude oil and its adsorption to rocks; microbial flooding uses microorganisms and their metabolites to crack heavy hydrocarbons and paraffin, turning large molecules of petroleum into small molecules, and metabolizes to produce gases soluble in crude oil, thereby reducing the viscosity of crude oil and increasing the fluidity of crude oil, thereby achieving the purpose of improving crude oil recovery rate.

[0048] In the process of oil and gas extraction, as the extraction progresses, the energy of the oil and gas well formation continues to decay. In order to ensure the smooth progress of extraction, certain measures need to be taken to maintain the formation energy. Among them, water injection is an important means for oil and gas wells to maintain formation pressure, accelerate recovery speed, and improve recovery rate. When using water injection to maintain formation energy, it is necessary to carry out corresponding dynamic monitoring work. By monitoring the corresponding parameters, it is possible to judge whether the injected water has entered the designed layer, whether the expected oil recovery effect has been achieved, whether the injection plan is reasonable, etc.

[0049] In the prior art, dynamic monitoring of the water injection process is generally achieved by placing a test instrument into the water injection well and using the test instrument to monitor relevant parameters during the water injection process. For a horizontal water injection well, the test instrument cannot rely on gravity to enter the horizontal section of the horizontal water injection well. At this time, an external force is required to place the test instrument into the horizontal section of the horizontal water injection well. In the prior art, a crawling robot is generally used to assist the test instrument in moving to the horizontal section of the horizontal water injection well. The specific method is: fix the test instrument on the crawling robot, and then place the crawling robot into the oil pipe so that it drives the test instrument into the horizontal section of the horizontal water injection well.

[0050] However, since some impurities will inevitably remain in the oil pipes during the production process of oil and gas wells, the crawling robot is very likely to get stuck when passing through this section; in addition, the manufacturing cost of the crawling robot itself is expensive, which increases the production cost of the construction unit.

[0051] In order to overcome the above-mentioned defects of the prior art, the purpose of the present invention is to provide a dynamic monitoring system for horizontal water injection wells. The system of the present invention is not prone to jamming when the test instrument is placed in the horizontal section of the horizontal water injection well, and can effectively reduce the production cost of the construction unit.

[0052] The content of the present invention will be described in detail below in conjunction with the accompanying drawings so that those skilled in the art can understand the content of the present invention in more detail.

[0053] Figure 1 A simplified structural diagram of a horizontal water injection well dynamic monitoring system provided by one embodiment of the present invention;

[0054] Figure 2 A simplified structural diagram of a wellbore structure provided by an embodiment of the present invention; Figure 3 A simplified structural diagram of a Christmas tree provided in one embodiment of the present invention; Figure 4 A simplified structural diagram of a dynamic monitoring device provided by an embodiment of the present invention; Figure 5 A simplified structural diagram of a powered parachute provided in one embodiment of the present invention; Figure 6 A schematic diagram of the structure of a driving device provided in one embodiment of the present invention; please refer to Figure 1-Figure 6The present embodiment provides a horizontal water injection well dynamic monitoring system, including a water injection well 100 and a dynamic monitoring device 200 disposed in the water injection well 100; the water injection well 100 includes a well structure 110 and an oil tree 120, the well structure 110 is disposed below the oil tree 120, the well structure 110 includes a casing 111 and an oil pipe 112, the casing 111 and the oil pipe 112 are both connected to the oil tree 120, the oil pipe 112 is disposed in the casing 111, and the oil pipe 112 includes a vertical section 1121, a curved section 1122, and a vertical section 1123. 1122 and the horizontal section 1123, the curved section 1122 is arranged between the vertical section 1121 and the horizontal section 1123; the dynamic monitoring device 200 is arranged in the oil pipe 112, the dynamic monitoring device 200 includes a testing instrument 210 and a paramotor 220 fixedly connected to the testing instrument 210, the cross-sectional area of ​​the paramotor 220 is larger than the cross-sectional area of ​​the testing instrument 210, and under the drive of the driving device, the paramotor 220 drives the testing instrument 210 to move from the vertical section 1121 to the horizontal section 1123.

[0055] Specifically, the water injection well 100 in this embodiment is an oil well in which the formation pressure during production is insufficient to supply normal production. The water injection well 100 includes a horizontal section, and the perforation section 1111 of the casing 111 is arranged at the lower part of the horizontal section, which is not easy to place the testing instrument 210. The structure of the water injection well 100 is the same as that of the water injection well in the prior art, and it includes a wellbore structure 110 and an oil tree 120, wherein the wellbore structure 110 is arranged below the oil tree 120, the wellbore structure 110 includes a casing 111 and an oil pipe 112, both the casing 111 and the oil pipe 112 are connected to the oil tree 120, and the oil pipe 112 is arranged in the casing 111, and an oil-casing annulus is formed between the two. The oil pipe 112 includes a vertical section 1121, a curved section 1122 and a horizontal section 1123. The curved section 1122 is arranged between the vertical section 1121 and the horizontal section 1123. Here, the curved section 1122 is formed by the gradual transition from the vertical section 1121 to the horizontal section 1123, and the curvature in each section is very small. The curved section 1122 is also a place where impurities in the oil pipe are easily accumulated, and the testing instrument 210 is easily blocked when passing through this section. The bottom of the casing 111 is provided with a perforation section 1111, which is connected to the formation. The water injected through the oil pipe 112 flows into the formation through the perforation section 1111, thereby replenishing the energy of the formation to maintain normal production.

[0056] The test device 200 of this embodiment includes a test instrument 210 and a power parachute 220 fixedly connected to the test instrument 210, wherein the test instrument 210 and the power parachute 220 are arranged in the oil pipe 112, and the cross-sectional area of ​​the power parachute 220 should be smaller than the diameter of the oil pipe. At the same time, in this embodiment, the cross-sectional area of ​​the power parachute 220 is set to be larger than the cross-sectional area of ​​the test instrument 210. According to the principle that force is equal to the product of pressure and surface area, under the same driving pressure, increasing the cross-sectional area of ​​the power parachute 220 is conducive to increasing the driving force applied by the driving device to the power parachute 220. Driven by the driving device, the power parachute 220 drives the test instrument 210 to move from the vertical section 1121 to the horizontal section 1123.

[0057] When the present embodiment is in use, the test instrument 210 and the power parachute 220 enter the interior of the oil pipe 112 through the corresponding entrances on the Christmas tree 120. In the vertical section 1121 of the oil pipe 112, the test instrument 210 and the power parachute 220 can be moved downward by their own gravity. When passing through the curved section 1122, due to the increase in resistance, the test instrument 210 and the power parachute 220 cannot continue to move by their own gravity. At this time, a force can be applied to the power parachute 220 by a driving device. Since the power parachute 220 has a large cross-sectional area, a greater driving force can be applied to the test instrument 210. When encountering a section with impurities, the output driving pressure can be increased to increase the force on the power parachute 220, so that the test instrument 210 and the power parachute 220 can pass through the impurity section. When the test instrument 210 and the power parachute 220 enter the horizontal section 1123, the driving force of the driving device can be output steadily, so that the test instrument 210 reaches the specified position to monitor various parameters during water injection.

[0058] The water injection well dynamic monitoring system provided in this embodiment includes a water injection well 100 and a dynamic monitoring device 200 arranged in the water injection well 100; the water injection well 100 includes a well structure 110 and an oil tree 120, the well structure 110 is arranged below the oil tree 120, the well structure 110 includes a casing 111 and an oil pipe 112, the casing 111 and the oil pipe 112 are both connected to the oil tree 120, the oil pipe 112 is arranged in the casing 111, and the oil pipe 112 includes a vertical section 1121, a curved section 1122, and a vertical section 1123. 122 and horizontal section 1123, the curved section 1122 is arranged between the vertical section 1121 and the horizontal section 1123; the dynamic monitoring device 200 is arranged in the oil pipe 112, and the dynamic monitoring device 200 includes a test instrument 210 and a power parachute 220 fixedly connected to the test instrument 210, the cross-sectional area of ​​the power parachute 220 is larger than the cross-sectional area of ​​the test instrument 210, and under the drive of the driving device, the power parachute 220 drives the test instrument 210 to move from the vertical section 1121 to the horizontal section 1123. In this embodiment, the power parachute 220 is connected to the test instrument 210, and the cross-sectional area of ​​the power parachute 220 is larger than the cross-sectional area of ​​the test instrument 210. Under the drive of the driving device, the force acting on the power parachute 220 is greater than the force directly acting on the test instrument 210, so that the driving force of the driving device acting on the test instrument 210 can be greatly enhanced through the power parachute 220, thereby driving the test instrument 210 to move from the vertical section 1121 to the horizontal section 1123. When using the system of this embodiment, the driving force applied by the driving device can be increased to prevent the testing instrument 210 from getting stuck when placed in the horizontal section 1123 of the water injection well. Using a powered parachute 220 instead of a crawling robot can effectively reduce the production cost of the construction unit.

[0059] Furthermore, in this embodiment, the paramotor 220 and the testing instrument 210 can be connected by any suitable connection method. For example, in an optional embodiment, the paramotor 220 and the testing instrument 210 are fixedly connected by a threaded connection.

[0060] Furthermore, after the power parachute 220 is connected to the testing instrument 210, the center line of the power parachute 220 coincides with the center line of the testing instrument 210, so that the force applied by the power parachute 220 to the testing instrument 210 is more uniform.

[0061] Furthermore, in this embodiment, the paramotor 220 can be fixed to any position of the upper part, the middle part or the lower part of the testing instrument 210 .

[0062] Furthermore, the cross section of the power parachute 220 may be circular, square, triangular or other irregular shapes, which is not further limited in this embodiment. The power parachute 220 may be designed according to the size of the oil pipe 112 to be lowered, and a power parachute 220 of corresponding size may be selected according to the oil pipe 112 of different diameters.

[0063] Furthermore, the present embodiment does not limit the material of the paramotor 220, but the paramotor 220 should have a certain strength to resist the destructive force of water pressure. For example, the paramotor 220 can be a rubber paramotor, a resin paramotor, or a metal paramotor.

[0064] In this embodiment, the Christmas tree 120 includes a water injection pipeline 121 and a test pipeline 122 connected to the oil pipe 112, and a water return pipeline 123 connected to the casing 111. The water injection pipeline 121 is provided with a production valve 1211, which is used to control the opening and closing of the water injection pipeline 121 and the water flow rate therein; the test pipeline 122 is provided with a test valve 1221, and the power paramotor 220 and the test instrument 210 can enter the oil pipe 112 by opening the test valve 1221; the water return pipeline 123 is provided with a casing valve 1231, which is used to control the opening and closing of the water return pipeline 123 and the water flow rate therein.

[0065] Furthermore, the driving device of this embodiment includes a water injection station 310 and a water injection pump 320 for controlling the water injection intensity of the water injection station 310 . The water injection station 310 is connected to the water injection pipeline 121 , and the water injection pump 320 is arranged on the water injection pipeline 121 .

[0066] Furthermore, the dynamic monitoring device 200 of this embodiment also includes a controller 240, and the controller 240 is connected to the test instrument 210 through the test cable 230 to collect the measurement data of the test instrument 210 and realize the real-time monitoring function. The test cable 230 is connected to the test instrument 210 through the test pipeline 122. Specifically, the power parachute 220 of this embodiment is connected to the upper end of the test instrument 210, and a through hole 2201 for the test cable 230 to pass through is provided on the power parachute 220. After the test cable 230 passes through the through hole 2201, it is connected to the test instrument. A sealing device can also be provided between the through hole 2201 and the test cable 230 to ensure sealing.

[0067] Furthermore, the return water pipeline 123 of the present embodiment may be connected to a wastewater collection device to collect the well-washing return water discharged from the oil casing annulus to prevent pollution.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A horizontal water injection well dynamic monitoring system, characterized in that: It comprises a water injection well and a dynamic monitoring device arranged in the water injection well; the water injection well comprises a well body structure and a Christmas tree, the well body structure is arranged below the Christmas tree, the well body structure comprises casing and oil pipe, the casing and oil pipe are both connected to the Christmas tree, the oil pipe is arranged in the casing, the oil pipe comprises a vertical section, a curved section and a horizontal section, the curved section is arranged between the vertical section and the horizontal section; the casing is provided with a perforation section, the perforation section is arranged at the lower part of the horizontal section of the casing, and the perforation section is connected to the formation; the Christmas tree comprises a water injection pipeline and a test pipeline connected to the oil pipe and a return pipeline connected to the casing; the water injection pipeline is provided with a production valve; the test pipeline is provided with a test valve; the return pipeline is provided with a casing valve; the return pipeline is connected with a wastewater collection device; The dynamic monitoring device is arranged in the oil pipe, and the dynamic monitoring device includes a test instrument and a power parachute fixedly connected to the test instrument, the cross-sectional area of ​​the power parachute is larger than the cross-sectional area of ​​the test instrument, and under the drive of the driving device, the power parachute drives the test instrument to move from the vertical section to the horizontal section; the cross-sectional area of ​​the power parachute is circular, square or triangular; the power parachute is fixed on the upper part or the middle part of the test instrument; the dynamic monitoring device also includes a controller, and the controller is connected to the test instrument through a test cable, and the test cable is connected to the test instrument through the test pipeline; when the power parachute is connected to the upper part of the test instrument, a through hole for the test cable to pass through is provided on the power parachute, and the test cable is connected to the test instrument after passing through the through hole, and a sealing device is provided between the through hole and the test cable.

2. The horizontal water injection well dynamic monitoring system according to claim 1, characterized in that: The power parachute is fixedly connected to the testing instrument by means of a threaded connection.

3. The horizontal water injection well dynamic monitoring system according to claim 2, characterized in that: The center line of the paramotor coincides with the center line of the testing instrument.

4. The horizontal water injection well dynamic monitoring system according to claim 1, characterized in that: The power parachute is a rubber power parachute, a resin power parachute or a metal power parachute.

5. The horizontal water injection well dynamic monitoring system according to claim 4, characterized in that: The driving device comprises a water injection station and a water injection pump for controlling the water injection intensity of the water injection station, the water injection station is connected to the water injection pipeline, and the water injection pump is arranged on the water injection pipeline.

Images