Double-layer triplex working system plug device and double-layer triplex working system

Abstract

This disclosure relates to the field of oilfield production technology, and more particularly to a plugging device and a double-layer triple-operation oil testing system. The disclosure provides a plugging device for a double-layer triple-operation oil testing system, including a working sleeve and a plugging mechanism. The working sleeve has tubing connection sections at both ends. The plugging mechanism is disposed within the working sleeve and includes a plugging body, a retrieval part, a fixing part, a sealing part, and a detection part. The detection part is used to detect the temperature and pressure of the fluid flowing into the fluid passage. The sealing part is used to block the flow of fluid between the plugging body and the working sleeve. The fixing part is connected to the plugging body and has a locked state and an unlocked state. The retrieval part is used to apply a force to the fixing part to switch from the unlocked state to the locked state. By implementing the technical solution of this disclosure, the oil and gas temperature and pressure of the formation in the well can be accurately tested, and the plugging is simple.

Description

Technical Field

[0001] This disclosure relates to the field of oilfield production technology, and in particular to a plugging device and a double-layer triple-operation oil testing system. Background Technology

[0002] As exploration targets gradually shift towards deeper formations, operational difficulties, costs, and timelines increase. Oil testing processes are relatively independent, and traditional methods typically involve single-well testing followed by oil production and data analysis. This single-well testing method is inefficient, time-consuming, and unable to test multiple reservoirs simultaneously. Therefore, a new construction technology is needed to improve efficiency and reduce costs. This has led to the development of the double-layer triple-operation oil testing project, where a single tubing string can complete testing, gas lift drainage, and fracturing.

[0003] However, existing blocking devices are not conducive to retrieval and cannot achieve the purpose of airlift drainage and testing while blocking. Summary of the Invention

[0004] This disclosure aims to address at least one of the technical problems existing in the prior art or related technologies.

[0005] Therefore, in the first aspect of this disclosure, a plugging device for a double-layer triple-operation oil testing system is provided, comprising a working sleeve and a plugging mechanism. The working sleeve has tubing connection sections at both ends, and the plugging mechanism is disposed within the working sleeve.

[0006] The blocking mechanism includes a blocking body, a retrieval part, a fixing part, a sealing part, and a detection part. The blocking body has a fluid passage. The retrieval part and the detection part are connected to both ends of the blocking body. The detection part is in communication with the fluid passage and is used to detect the temperature and pressure of the fluid flowing into the fluid passage. The sealing part is used to block the flow of the fluid between the blocking body and the working sleeve. The fixing part is connected to the blocking body and has a locked state and an unlocked state. The retrieval part is used to apply a force to the fixing part to switch from the unlocked state to the locked state.

[0007] In the locked state, the relative position of the fixing part and the working sleeve is fixed; in the unlocked state, the fixing part is disengaged from the working sleeve.

[0008] In one feasible implementation, a flow-guiding seal is provided inside the fluid passage, which defines the fluid passage as a fluid detection section and a fluid receiving section, and the flow-guiding seal is used to restrict the fluid from flowing back from the fluid receiving section to the fluid detection section.

[0009] In one feasible implementation, the retrieval unit includes a retrieval head, a central rod, a positioning element, and an elastic element. The positioning element is disposed within the blocking body. The central rod passes through the closed body and is connected to the positioning element. One end of the central rod is connected to the retrieval head, and the other end is connected to the fixing part. The elastic element is disposed on the central rod and is used to apply a force to the fixing part to switch from the unlocked state to the locked state.

[0010] In one feasible embodiment, the fixing part includes a cam and a rotating shaft, the rotating shaft being used to drive the cam to switch between the locked state and the unlocked state, the cam being provided with an abutting end and a locking end, and the working sleeve being provided with a locking groove, wherein...

[0011] In the locked state, the snap-fit ​​end is snapped into and fixed with the snap-fit ​​groove, and the center rod abuts against the abutting end.

[0012] In one feasible embodiment, the sealing part is disposed between the fixing part and the detection part, and the fixing part is configured as a sealing ring.

[0013] In one feasible implementation, the working sleeve includes a first sleeve body and a second sleeve body, the first sleeve body and the second sleeve body are detachably connected, and a first sealing element is provided at the connection between the first sleeve body and the second sleeve body.

[0014] In one feasible implementation, the plugging body includes a first plugging body and a second plugging body, the first plugging body and the second plugging body being detachably connected, and a second seal is provided at the connection between the first plugging body and the second plugging body.

[0015] In one feasible implementation, the fluid passage is connected to the detection unit via a variable snap fastener.

[0016] In one feasible implementation, a liquid inlet is provided on the side wall of the blockage body near the detection part, and a screen is provided on the liquid inlet.

[0017] A second aspect of this disclosure provides a double-layer triple-operation oil testing system, including the aforementioned plugging device for the double-layer triple-operation oil testing system.

[0018] Compared with the prior art, this disclosure has at least the following beneficial effects: This disclosure achieves the plugging of a double-layer triple-operation oil testing tubing string through the cooperation of a working sleeve and a plugging mechanism, and then lowers the disclosure into the downhole pre-detection position for detection. The plugging mechanism is lowered into the working sleeve connected to the tubing string through the drop-out part, and its relative position with the working sleeve is fixed by the fixing part. After the fixing part is fixed to the working sleeve, the sealing part blocks the flow of fluid between the plugging body and the working sleeve, so that the oil can only flow into the tubing string through the plug. At the same time as the oil flows, the detection part detects the temperature and pressure of the fluid flowing into the fluid passage. By implementing the technical solution of this disclosure, the oil and gas temperature and pressure of the formation in the well can be accurately tested, and the deployment is simple. Attached Figure Description

[0019] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0020] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, those skilled in the art can obtain other drawings based on these drawings without creative effort.

[0021] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0022] Figure 1 This is a schematic diagram of the blocking mechanism in the unlocked state.

[0023] Figure 2 This is a schematic diagram of the blocking mechanism in the locked state.

[0024] Figure 3 This is a schematic diagram of the insertion string of the blocking mechanism disclosed herein;

[0025] Figure 4 This is a schematic diagram of the structure of the working sleeve of this disclosure;

[0026] Figure 5 This is a schematic diagram of the connection between the working sleeve and the tubing column in this disclosure;

[0027] Figure 6 This is a schematic diagram of the structure of the blocking mechanism of this disclosure, which involves inserting the working sleeve.

[0028] Figure 7This is a schematic diagram of the overall structure of the working sleeve, plugging mechanism and tubing disclosed herein.

[0029] in, Figures 1 to 7 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0030] 100 - Pipeline; 200 - Steel wire; 300 - Lowering tool;

[0031] 1-Working sleeve; 11-First sleeve body; 12-Second sleeve body; 13-First seal; 2-Blocking mechanism; 21-Blocking body; 211-First blocking body; 212-First blocking body; 213-Second seal; 22-Retrieving part; 221-Retrieving head; 222-Center rod; 223-Positioning part; 224-Elastic part; 23-Fixing part; 231-Cam; 232-Rotating shaft; 24-Sealing part; 25-Detection part; 3-Flow guiding seal; 4-Variable buckle; 5-Screen. Detailed Implementation

[0032] To better understand the above-mentioned objectives, features, and advantages of this disclosure, the solutions disclosed herein will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0033] Numerous specific details are set forth in the following description in order to provide a full understanding of this disclosure, but this disclosure may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some, and not all, of the embodiments of this disclosure.

[0034] Currently, existing plugging devices can only completely block the tubing string, and existing detectors have certain deviations in their data for detecting formation oil fluids because the upward flow of oil and gas in the formation causes pressure changes. There is an urgent need for a device that can accurately test the temperature and pressure of oil and gas in the wellbore, integrate plugging and detection, facilitate easy deployment and retrieval, and ensure a good flow path for the lower oil and gas to smoothly return during gas lift.

[0035] Based on this, the present disclosure provides a plugging device for a double-layer triple-operation oil testing system. This disclosure achieves plugging of the double-layer triple-operation oil testing string by cooperating with a working sleeve and a plugging mechanism, and then lowers it into the downhole pre-detection position for testing. The plugging mechanism is lowered into the working sleeve connected to the string via a drop-out part, and its relative position to the working sleeve is fixed by a fixing part. After the fixing part is fixed to the working sleeve, the sealing part blocks the flow of fluid between the plugging body and the working sleeve, ensuring that oil can only flow into the string through the plugging body. Simultaneously, the detection part detects the temperature and pressure of the fluid flowing into the fluid passage. By implementing the technical solution of this disclosure, the oil and gas temperature and pressure of the formation in the well can be accurately tested, and the deployment is simple.

[0036] The following detailed description of the clogging device of the double-layer triple-operation oil testing system is provided through specific embodiments:

[0037] Reference Figures 1 to 7 As shown, a first aspect of this disclosure provides a plugging device for a double-layer triple-operation oil testing system, including a working sleeve 1 and a plugging mechanism 2. The working sleeve 1 has tubing connection sections at both ends. The plugging mechanism 2 is disposed inside the working sleeve 1 and includes a plugging body 21, a retrieval part 22, a fixing part 23, a sealing part 24, and a detection part 25. The plugging body 21 has a fluid passage. The retrieval part 22 and the detection part 25 are connected to both ends of the plugging body 21. The detection part 25 communicates with the fluid passage and is used to detect the temperature and pressure of the fluid flowing into the fluid passage. The sealing part 24 is used to block the flow of fluid between the plugging body 21 and the working sleeve 1. The fixing part 23 is connected to the plugging body 21 and has a locked state and an unlocked state. The retrieval part 22 is used to apply a force to the fixing part 23 to switch from the unlocked state to the locked state. In the locked state, the relative position of the fixing part 23 and the working sleeve 1 is fixed. In the unlocked state, the fixing part 23 is disengaged from the working sleeve 1.

[0038] This disclosure utilizes a working sleeve 1 and a plugging mechanism 2 to achieve plugging of a double-layer triple-operation oil testing tubing string and run it downhole to a pre-testing location, such as 2000 meters downhole. The plugging mechanism 2 is lowered into the working sleeve 1 connected to the tubing string 100 via a drop-out part 22. A fixing part 23 secures its relative position to the working sleeve 1. After fixing, a sealing part 24 blocks fluid flow between the plugging body 21 and the working sleeve 1, allowing oil to flow into the tubing only through the plugging body 21. Simultaneously, a detection part 25 detects the temperature and pressure of the fluid flowing into the fluid passage. By implementing this technical solution, the oil and gas temperature and pressure of the formation in the well can be accurately tested, and the deployment is simple.

[0039] Specifically, the upper end of the working sleeve 1 is threaded to the tubing string 100, and the lower end of the working sleeve 1 is threaded to the tubing string. According to process requirements, the overall material selection in this disclosure requires a temperature resistance of 150℃, a pressure resistance of 35MPa, and a sealing pressure >15MPa. The working sleeve 1 is pre-connected to the preset position of the tubing string 100 in the triple-operation system, and is lowered into the well along with the tubing string. At this time, the internal diameter of the working sleeve 1 is a channel, the size of which is designed to ensure that the setting steel ball can pass smoothly during the ball setting of the lower packer. It should be noted that the ball setting and other components of the lower packer are existing components of the double-layer triple-operation oil testing system, and will not be described in detail here. During the deployment of the plugging mechanism 2, if... Figure 3 As shown, a wireline can be used to insert the plugging mechanism 2 from the wellhead into the tubing string. The delivery tool string consists of a wire 200, a lowering tool 300, and the plugging mechanism 2. The lowering tool 300 includes a rope cap, a weight bar, a vibrator, and a delivery device. After the plugging mechanism 2 is delivered to the working sleeve 1, it is struck downwards, causing it to enter the working sleeve 1. The fixing part 23 is then fixed inside the working sleeve 1. Continuing to strike downwards breaks the shear pin, thus releasing the plugging mechanism 2. The wireline tool string is then retrieved, completing the delivery operation. Furthermore, the fixing part 23 of this disclosure can be an expander, a snap-fit ​​mechanism, or other devices. For example, multiple grippers can be provided on the circumferential side wall of the blocking body 21. When in an appropriate position, the grippers extend and abut against the inner wall of the working sleeve 1 for fixing. Alternatively, a snap-fit ​​block can be provided on the blocking body 21 and a matching snap-fit ​​groove can be provided on the inner wall of the working sleeve 1 for snap-fit ​​fixing. It is understood that in the snap-fit ​​fixing embodiment, since the blocking mechanism 2 needs to be retrieved, the snap-fit ​​block should be able to separate from the snap-fit ​​groove. The specific separation method can be that the snap-fit ​​block can be extended or retracted by means of electronic control, or the snap-fit ​​block can be connected to the snap-fit ​​block by means of elastic element and the abutment force can be used to retract the snap-fit ​​block back into the blocking body 21.

[0040] During the retrieval operation, a wireline is used to send the matching retrieval tool from the wellhead into the tubing string. The retrieval tool string generally consists of a wireline, a rope cap, a weight rod, a vibrator, and the retrieval tool. It is lowered to the position of the plugging mechanism 2, the fixing part 23 is adjusted to the unlocked state, the plug is pulled out of the working sleeve 1, and then pulled back up to the wellhead to complete the retrieval operation.

[0041] The detection unit 25 disclosed herein is configured as a storage type, internally containing electronic components such as a battery circuit board and sensors, used to record and store the temperature and pressure of the fluid at this location. After retrieval, the data can be retrieved through data playback for use by technicians. Its temperature and pressure sensors are adaptively selected according to the actual needs of the oil well. Furthermore, the storage-type pressure regulator simultaneously records fluid parameters at a sampling rate of 5 m / s to ensure data accuracy.

[0042] In some embodiments, a flow guiding seal 3 is provided inside the fluid passage, which defines the fluid passage as a fluid detection section 25 and a fluid receiving section. The flow guiding seal 3 is used to restrict the fluid from flowing back from the fluid receiving section to the fluid detection section 25.

[0043] In this embodiment, the flow-guiding seal 3 of this disclosure is configured as a one-way valve, equipped with a sealing ring to provide a one-way seal. This allows oil and gas in the fluid detection section 25 to flow upwards, but prevents fluid in the upper fluid receiving section from flowing downwards. This ensures accurate testing of the formation oil and gas temperature and pressure, avoiding data deviations caused by changes in pressure and temperature due to passageway issues. During gas lift operations, the upward flow channel for oil and gas can be smoothly opened, thus completing the gas lift test. Furthermore, when gas lift stops, the fluid in the tubing string can be locked by the one-way valve to prevent backflow into the oil layer, improving the efficiency of the gas lift.

[0044] In some embodiments, the retrieval unit 22 includes a retrieval head 221, a central rod 222, a positioning member 223, and an elastic member 224. The positioning member 223 is disposed inside the blocking body 21. The central rod 222 passes through the closed body and is connected to the positioning member 223. One end of the central rod 222 is connected to the retrieval head 221, and the other end is connected to the fixing part 23. The elastic member 224 is disposed on the central rod 222 and is used to apply a force to the fixing part 23 to switch from an unlocked state to a locked state.

[0045] In this embodiment, the retrieval head 221 and the central rod 222 are threadedly connected. Furthermore, a detachable upper cap can be provided at one end of the plugging body 21 near the retrieval head 221. The central rod 222 passes through the upper cap and enters the plugging body 21, thus guiding the central rod 222 and facilitating its removal during maintenance. The central rod 222 is threadedly connected to the positioning element 223, which can be a threaded positioning block or a positioning nut; this disclosure specifically uses a positioning nut as the positioning element 223. The upper outer sleeve 4 and the lower outer sleeve 10 are threadedly connected. The elastic element 224 can be a spring sleeved on the central rod 222 or made of an elastic material; this disclosure specifically uses a spring.

[0046] Specifically, the retrieval head 221 can be captured and retrieved by the retrieval device for retrieval operations to remove the plug from the well. The elastic element 224 is used to compress the positioning element 223, which allows the two center rods to jam the fixing part 23, so that the fixing part 23 can remain locked in the absence of external force. When the locking end of the fixing part 23 is compressed by external force, it tends to unlock due to the setting of the elastic element 224, and returns to the locked state after the locking end is free from external force compression.

[0047] In some embodiments, the fixing part 23 includes a cam 231 and a rotating shaft 232. The rotating shaft 232 is used to drive the cam 231 to switch between a locked state and an unlocked state. The cam 231 is provided with an abutting end and a snap-fit ​​end. The working sleeve 1 is provided with a snap-fit ​​groove. In the locked state, the snap-fit ​​end is snapped and fixed with the snap-fit ​​groove, and the center rod 222 abuts against the abutting end.

[0048] In this embodiment, such as Figure 1 As shown, cam 231 can rotate on shaft 232, and cam 231 is in the extended state, as... Figure 2 The cam 231 shown is in the retracted state. These two states correspond to the locked state and the unlocked state, respectively.

[0049] In some embodiments, the sealing part 24 is disposed between the fixing part 23 and the detection part 25, and the fixing part 23 is configured as a sealing ring. In this embodiment, disposing the sealing part 24 between the fixing part 23 and the detection part 25 better ensures the fixing ability of the fixing part 23 and prevents it from being damaged by oil and gas erosion. It is understood that in embodiments where the sealing part 24 is configured as a sealing ring, the sealing ring is fitted onto the plugging body 21, and an installation groove is provided at a corresponding position on the plugging body 21 for installing the sealing ring. The sealing ring can be configured as an expansion type, expanding and sealing when the sealing part 24 body is lowered into a preset position. This facilitates the lowering of the sealing mechanism 2, ensuring that it is not obstructed by the sealing part 24 during the lowering process.

[0050] In some embodiments, the working sleeve 1 includes a first sleeve body 11 and a second sleeve body 12, the first sleeve body 11 and the second sleeve body 12 are detachably connected, and a first sealing element 13 is provided at the connection between the first sleeve body 11 and the second sleeve body 12.

[0051] In this embodiment, the detachable connection between the first sleeve body 11 and the second sleeve body 12 facilitates the connection and maintenance of the working sleeve 1. Specifically, the first sleeve body 11 and the second sleeve body 12 are connected by threads. The first sealing element 13 of this disclosure seals the gap at the connection, thereby preventing the mutual flow of oil and gas between the inside and outside.

[0052] In some embodiments, the plugging body 21 includes a first plugging body 211 and a first plugging body 212, the first plugging body 211 and the first plugging body 212 are detachably connected, and a second seal 213 is provided at the connection between the first plugging body 211 and the first plugging body 212.

[0053] In this embodiment, the detachable connection between the first plug body 211 and the first plug body 212 facilitates the connection and maintenance of the plug body 21. Specifically, the first plug body 211 and the first plug body 212 are connected by threads. The second seal 213 of this disclosure seals the gap at the connection, thereby preventing the mutual flow of oil and gas between the inside and outside.

[0054] In some embodiments, the fluid passage and the detection unit 25 are connected via a variable coupling 4. The main purpose of the variable coupling is to solve the connection problem between pipes or equipment of different specifications and models, ensuring that fluid can be smoothly transmitted through the coupling. Variable couplings can also reduce downtime and labor costs, and improve work efficiency.

[0055] In some embodiments, a liquid inlet is provided on the side wall of the blockage body 21 near the detection section 25, and a screen 5 is provided at the liquid inlet.

[0056] In this embodiment, the screen 5 is set as a sand filter, which can filter sand and dirt in oil and gas, ensuring that the flow guide seal 3 is not blocked, and can greatly extend the service life of the device.

[0057] A second aspect of this disclosure provides a double-layer triple-operation oil testing system, including the aforementioned plugging device for the double-layer triple-operation oil testing system.

[0058] In this disclosure, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise expressly defined. The terms "install," "connect," "link," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "link" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this disclosure according to the specific circumstances.

[0059] In the description of this disclosure, it should be understood that the terms "upper," "lower," "left," "right," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this disclosure and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0060] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0061] The above are merely preferred embodiments of this disclosure and are not intended to limit this disclosure. Various modifications and variations can be made to this disclosure by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this disclosure should be included within the scope of protection of this disclosure.

Claims

1. A clogging device for a double-layer triple-operation oil testing system, characterized in that, It includes a working sleeve and a blocking mechanism. The working sleeve has tubular connecting sections at both ends, and the blocking mechanism is disposed inside the working sleeve. The blocking mechanism includes a blocking body, a retrieval part, a fixing part, a sealing part, and a detection part. The blocking body has a fluid passage. The retrieval part and the detection part are connected to both ends of the blocking body. The detection part is in communication with the fluid passage and is used to detect the temperature and pressure of the fluid flowing into the fluid passage. The sealing part is used to block the flow of the fluid between the blocking body and the working sleeve. The fixing part is connected to the blocking body and has a locked state and an unlocked state. The retrieval part is used to apply a force to the fixing part to switch from the unlocked state to the locked state. In the locked state, the relative position of the fixing part and the working sleeve is fixed; in the unlocked state, the fixing part is disengaged from the working sleeve.

2. The clogging device of the double-layer triple-operation oil testing system according to claim 1, characterized in that, The fluid passage is provided with a flow guiding seal, which defines the fluid passage as a fluid detection part and a fluid receiving part. The flow guiding seal is used to restrict the fluid from flowing back from the fluid receiving part to the fluid detection part.

3. The clogging device of the double-layer triple-operation oil testing system according to claim 1, characterized in that, The retrieval unit includes a retrieval head, a central rod, a positioning element, and an elastic element. The positioning element is disposed within the blocking body. The central rod passes through the closed body and is connected to the positioning element. One end of the central rod is connected to the retrieval head, and the other end is connected to the fixing part. The elastic element is disposed on the central rod and is used to apply a force to the fixing part to switch from the unlocked state to the locked state.

4. The clogging device of the double-layer triple-operation oil testing system according to claim 1, characterized in that, The fixing part includes a cam and a rotating shaft. The rotating shaft is used to drive the cam to switch between the locked state and the unlocked state. The cam is provided with an abutting end and a locking end. The working sleeve is provided with a locking groove. In the locked state, the snap-fit ​​end is snapped into the snap-fit ​​groove and fixed, and the center rod abuts against the abutting end.

5. The clogging device of the double-layer triple-operation oil testing system according to claim 1, characterized in that, The sealing part is disposed between the fixing part and the detection part, and the fixing part is configured as a sealing ring.

6. The clogging device of the double-layer triple-operation oil testing system according to claim 1, characterized in that, The working sleeve includes a first sleeve body and a second sleeve body, which are detachably connected, and a first sealing element is provided at the connection between the first sleeve body and the second sleeve body.

7. The clogging device for the double-layer triple-operation oil testing system according to claim 1, characterized in that, The plugging body includes a first plugging body and a second plugging body, which are detachably connected, and a second seal is provided at the connection between the first plugging body and the second plugging body.

8. The clogging device for the double-layer triple-operation oil testing system according to claim 1, characterized in that, The fluid passage is connected to the detection unit via a variable buckle.

9. The clogging device for the double-layer triple-operation oil testing system according to claim 1, characterized in that, The blockage body has a liquid inlet on the side wall near the detection unit, and the liquid inlet is equipped with a screen.

10. A double-layer triple-operation oil testing system, characterized in that, The clogging device includes the double-layer triple-operation oil testing system as described in any one of claims 1 to 9.

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