A handheld crude oil water interface measuring device

Abstract

The invention discloses a handheld crude oil oil-water interface measuring device, and relates to the technical field of oil-water interface measuring. The invention comprises: an outer cylinder, the inner side wall of the outer cylinder is slidably connected with the inner cylinder, the end of the inner cylinder is fixedly connected with a handle, dovetail grooves are provided on both sides of the inner cylinder, reagent strips are placed on the inner side walls of the dovetail grooves, and a sealing plate is installed at the bottom of the outer cylinder; the invention is easy to operate, small in size, light in weight, easy to be portable and operated by personnel at oil well production sites, easy to be used in oil field production site measurement environments, conducive to promotion and application in oil field production, and helpful to solve the problem of oil-water interface measurement in oil field production at low cost; through an effective mechanical structure, the probe measurement method is not adopted, and the influence of the upper solidified crude oil in a single well storage tank on the probe of the measuring instrument is reasonably solved; the chemical reaction strip adopted is a consumable, and multiple measurements can be achieved by replacing the chemical reaction strip.

Description

Technical Field

[0001] The invention relates to the technical field of oil-water interface measurement, and in particular to a handheld crude oil-water interface measurement device. Background Art

[0002] In the crude oil production process, accurate production measurement is an important reference indicator for oil wells to stabilize and increase production. However, due to geographical location or other reasons, many oil wells cannot directly connect the oil well output pipeline to the oil field metering station, and have to use single well storage tanks for storage and then transport in batches. Therefore, single well storage tank production measurement is a daily task in oil well production as mentioned above. Single well storage tanks often coexist with oil and water phases, but usually due to climate or crude oil properties, a thick layer of solidified crude oil will always form on the top of the liquid in the single well storage tank. This thick solidified crude oil seriously affects the determination of the oil-water interface.

[0003] The existing oil-water interface technologies include pressure difference type, float type, magnetostrictive type, ultrasonic detection type, capacitance type, etc. When the measuring probe of the above devices passes through the solidified crude oil, its surface is easily covered by the solidified crude oil, resulting in inaccurate measurement data; more importantly, most products are not convenient for operators to conduct daily inspections due to their structure, volume or principle. These detection devices are not very convenient to use in the oil well production process, and the existing monitoring devices are difficult to install due to the expansion of the reagent strip during use, and the oil will accumulate inside the dovetail groove due to too few reagent strips. For this reason, we propose a handheld crude oil water interface measurement device to solve the above problems. Summary of the invention

[0004] The purpose of the present invention is to solve the problem in the prior art that when the measuring probe of the device passes through the solidified crude oil, its surface is easily covered by the solidified crude oil, resulting in inaccurate measurement data; more importantly, most products are not convenient for operators to conduct daily inspections due to their structure, volume or principle. These detection devices are not very convenient to use in the oil well production process, and the existing monitoring devices are difficult to install due to the expansion of the reagent strip during use, and there is also a problem that oil accumulates inside the dovetail groove due to too few reagent strips. A handheld crude oil oil-water interface measuring device is proposed.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A handheld crude oil water interface measuring device, comprising:

[0007] An outer cylinder, the inner side wall of the outer cylinder is slidably connected to the inner cylinder, the end of the inner cylinder is fixedly connected to a handle, both sides of the inner cylinder are provided with dovetail grooves, the inner side walls of the dovetail grooves are provided with reagent strips, a sealing plate is installed at the bottom of the outer cylinder, a driving device is installed on the side of the sealing plate close to the inner cylinder, and the driving device is used to drive the internal structure of the inner cylinder to work;

[0008] A pushing mechanism, the pushing mechanism is installed inside the inner cylinder and is slidably connected to the inner side wall of the dovetail groove, the pushing mechanism is driven by the driving device to work, and the pushing mechanism is used to push the reagent strip for testing;

[0009] A clamping mechanism is installed inside the inner cylinder, the clamping mechanism is driven by the pushing mechanism and also driven by an external force, and the clamping mechanism is used to clamp the reagent strip to facilitate the installation of the inner cylinder and the outer cylinder.

[0010] Preferably, the side wall of the outer cylinder is symmetrically provided with a plurality of through holes, the outer side wall of the outer cylinder is symmetrically provided with scales, the inner side wall of the dovetail groove is slidably connected with a cleaning block, and the end of the outer cylinder away from the sealing plate is fixedly connected with a stopper.

[0011] Preferably, the driving device includes a plug-in block, a plug-in slot and a bidirectional worm gear; the outer wall of the plug-in block is in contact with the inner wall of the plug-in slot, the plug-in block is configured as a hexagonal column, the plug-in slot is configured as a hexagonal column, and the plug-in slot is opened at one end of the bidirectional worm gear.

[0012] Preferably, the pushing mechanism includes a worm gear sleeve, a return spring, a connecting rod and a push plate; the facing side of the worm gear sleeve is fixedly connected to the end of the return spring, one end of the connecting rod is connected to the outer wall of the worm gear sleeve through a bearing, and the side wall of the push plate close to the central axis of the inner cylinder is connected to the other end of the connecting rod through a bearing.

[0013] Preferably, the clamping mechanism includes a pull rope, a clamping spring, a clamping plate, an N-pole magnetic plate and an S-pole magnetic plate; one end of the pull rope is fixedly connected to the end of the clamping plate, one end of the clamping spring is fixedly connected to the end of the clamping plate, the clamping spring is sleeved on the outer wall of the pull rope, and the N-pole magnetic plate is arranged opposite to the S-pole magnetic plate.

[0014] Preferably, the end of the plug-in block is fixedly connected to a side of the sealing plate close to the inner cylinder, and the end of the bidirectional worm is connected to the inner wall of the inner cylinder via a bearing.

[0015] Preferably, the inner wall of the worm gear sleeve is meshed with the outer wall of the bidirectional worm, the reset spring sleeve is arranged on the outer wall of the bidirectional worm, the outer wall of the push plate is slidably connected with the inner wall of the dovetail groove, and the outer wall of the push plate is in contact with the reagent strip.

[0016] Preferably, the other end of the pull rope is fixedly connected to the bottom of the push plate, the other end of the clamping spring is fixedly connected to the inner wall of the inner cylinder, the outer wall of the clamping plate is slidably connected to the inner wall of the inner cylinder, the top of the N-pole magnetic plate is fixedly connected to the bottom of the push plate, and the bottom of the S-pole magnetic plate is fixedly connected to the bottom of the inner wall of the dovetail groove.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. The present invention is easy to operate. Through the ingenious mechanical structure and the combination of water testing reagents, the problem of the measuring probe being covered by crude oil and affecting the measurement accuracy is solved. In addition, the present invention is small in size and light in weight, and is easy for on-site personnel in oil well production to carry and operate. It is simple to operate and is easy to use in the measurement environment of oil field production sites, which is conducive to promotion and application in oil field production, and helps to solve the difficult problem of oil-water interface measurement in oil field production at a low cost. Through the effective mechanical structure, the probe measurement method is not adopted, and the influence of the solidified crude oil in the upper part of the single well storage tank on the measuring instrument probe is reasonably solved. The chemical reaction strip used is a consumable, and multiple measurements can be achieved by replacing the chemical reaction strip.

[0019] 2. The present invention uses a clamping mechanism. When installing a reagent strip, an external force is used to move the push plate inward, causing the N-pole magnetic plate and the S-pole magnetic plate to attract each other, so that the pull rope is in a loose rope state. At this time, the clamping plate will move outward under the action of the clamping spring to achieve the clamping operation of the reagent strip, facilitate the installation of the inner tube and the outer tube, prevent the expansion of the reagent strip from affecting the installation, ensure the speed and quality of the installation, and facilitate personnel use.

[0020] 3. The present invention uses a driving device, a pushing mechanism and a clamping mechanism in coordination. When conducting a measurement, the inner cylinder is driven to rotate by rotating the handle, thereby causing the two-way worm to rotate relatively, causing the worm gear sleeve to move toward the two ends of the two-way worm, and the push plate is pushed outward by the connecting rod. The outward pushing of the push plate will cause the pull rope to pull the clamping plate inward, so that the reagent strip can be close to the inner wall of the through hole, preventing oil and water from entering the dovetail groove to affect the test accuracy of the reagent strip during the measurement, thereby ensuring the accuracy of the measurement and facilitating personnel use. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A three-dimensional structural schematic diagram of a handheld crude oil-water interface measuring device proposed by the present invention;

[0022] Figure 2 This is a three-dimensional cross-sectional structural schematic diagram of a handheld crude oil-water interface measuring device proposed by the present invention;

[0023] Figure 3 This is a three-dimensional schematic diagram of the main structure of a handheld crude oil-water interface measuring device proposed by the present invention;

[0024] Figure 4 A handheld crude oil water interface measuring device proposed by the present invention Figure 2 The enlarged structural diagram at A in the middle;

[0025] Figure 5 A schematic diagram of the three-dimensional structure of a clamping mechanism of a handheld crude oil-water interface measuring device proposed by the present invention;

[0026] Figure 6 A schematic diagram of the three-dimensional structure of a pushing mechanism of a handheld crude oil-water interface measuring device proposed by the present invention;

[0027] Figure 7 A schematic diagram of a reagent strip of a handheld crude oil-water interface determination device proposed by the present invention.

[0028] In the figure: 1. outer cylinder; 2. inner cylinder; 3. handle; 4. sealing plate; 5. through hole; 6. scale; 7. stopper; 8. cleaning block; 9. dovetail groove; 10. driving device; 101. plug-in block; 102. plug-in groove; 103. bidirectional worm; 11. pushing mechanism; 111. worm gear sleeve; 112. reset spring; 113. connecting rod; 114. pushing plate; 12. clamping mechanism; 121. pull rope; 122. clamping spring; 123. clamping plate; 124. N-pole magnetic plate; 125. S-pole magnetic plate. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely 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, rather than all the embodiments.

[0030] Reference Figure 1-6 , a handheld crude oil water interface measuring device, comprising:

[0031] An outer cylinder 1, an inner cylinder 2 is slidably connected to the inner wall of the outer cylinder 1, a handle 3 is fixedly connected to the end of the inner cylinder 2, dovetail grooves 9 are provided on both sides of the inner cylinder 2, a reagent strip is placed on the inner wall of the dovetail groove 9, a sealing plate 4 is installed at the bottom of the outer cylinder 1, and a driving device 10 is installed on the side of the sealing plate 4 close to the inner cylinder 2, and the driving device 10 is used to drive the internal structure of the inner cylinder 2 to work;

[0032] A pushing mechanism 11, which is installed inside the inner tube 2 and is slidably connected to the inner wall of the dovetail groove 9. The pushing mechanism 11 is driven by the driving device 10 to work, and is used to push the reagent strip for testing;

[0033] The clamping mechanism 12 is installed inside the inner tube 2. The clamping mechanism 12 is driven by the pushing mechanism 11 and also driven by an external force. The clamping mechanism 12 is used to clamp the reagent strip to facilitate the installation of the inner tube 2 and the outer tube 1.

[0034] Among them, the side wall of the outer cylinder 1 is symmetrically provided with multiple through holes 5, the outer wall of the outer cylinder 1 is symmetrically provided with scales 6, the inner wall of the dovetail groove 9 is slidably connected with a cleaning block 8, and the end of the outer cylinder 1 away from the sealing plate 4 is fixedly connected with a stopper 7.

[0035] The driving device 10 includes a plug-in block 101, a plug-in slot 102 and a bidirectional worm 103; the outer wall of the plug-in block 101 is in contact with the inner wall of the plug-in slot 102, the plug-in block 101 is configured as a hexagonal column, the plug-in slot 102 is configured as a hexagonal column, and the plug-in slot 102 is provided at one end of the bidirectional worm 103;

[0036] The above-mentioned structure provides driving force for the pushing mechanism 11 to work.

[0037] The pushing mechanism 11 includes a worm gear sleeve 111, a return spring 112, a connecting rod 113 and a push plate 114; the facing side of the worm gear sleeve 111 is fixedly connected to the end of the return spring 112, one end of the connecting rod 113 is connected to the outer wall of the worm gear sleeve 111 through a bearing, and the side wall of the push plate 114 close to the central axis of the inner cylinder 2 is connected to the other end of the connecting rod 113 through a bearing;

[0038] By setting the above structure, the clamping mechanism 12 can be folded during measurement, so that the reagent strip can be close to the inner wall of the through hole 5, preventing oil and water from entering the dovetail groove 9 during measurement to affect the test accuracy of the reagent strip, thereby ensuring the accuracy of the measurement and facilitating use by personnel.

[0039] The clamping mechanism 12 includes a pull rope 121, a clamping spring 122, a clamping plate 123, an N-pole magnetic plate 124 and an S-pole magnetic plate 125; one end of the pull rope 121 is fixedly connected to the end of the clamping plate 123, one end of the clamping spring 122 is fixedly connected to the end of the clamping plate 123, the clamping spring 122 is sleeved on the outer wall of the pull rope 121, and the N-pole magnetic plate 124 is arranged opposite to the S-pole magnetic plate 125;

[0040] By setting the above structure, the clamping operation of the reagent strip is realized, which facilitates the installation of the inner tube 2 and the outer tube 1, prevents the expansion of the reagent strip from affecting the installation, ensures the speed and quality of the installation, and is convenient for personnel to use.

[0041] The end of the plug-in block 101 is fixedly connected to the side of the sealing plate 4 close to the inner tube 2, and the end of the bidirectional worm 103 is connected to the inner wall of the inner tube 2 through a bearing.

[0042] Among them, the inner wall of the worm gear sleeve 111 is meshed with the outer wall of the bidirectional worm 103, the return spring 112 is sleeved on the outer wall of the bidirectional worm 103, the outer wall of the push plate 114 is slidingly connected to the inner wall of the dovetail groove 9, and the outer wall of the push plate 114 is in contact with the reagent strip.

[0043] Among them, the other end of the pull rope 121 is fixedly connected to the bottom of the push plate 114, the other end of the clamping spring 122 is fixedly connected to the inner wall of the inner tube 2, the outer wall of the clamping plate 123 is slidingly connected to the inner wall of the inner tube 2, the top of the N-pole magnetic plate 124 is fixedly connected to the bottom of the push plate 114, and the bottom of the S-pole magnetic plate 125 is fixedly connected to the bottom of the inner wall of the dovetail groove 9.

[0044] In the present invention;

[0045] Embodiment 1:

[0046] When in use, the inner cylinder 2 is pulled out from the outer cylinder 1, and the dovetail grooves 9 on both sides of the inner cylinder 2 are evenly filled with reagent strips stained with water measuring reagents. The reagent strips should be flat and have appropriate compactness. When filling the reagent strips, the push plate 114 is moved inward by external force, so that the N-pole magnetic plate 124 and the S-pole magnetic plate 125 are attracted to each other, so that the pull rope 121 is in a loose rope state. At this time, the clamping plate 123 will move outward under the action of the clamping spring 122 to achieve the clamping operation of the reagent strip, so that the reagent strip cannot be exposed. Out of the dovetail groove 9, insert the inner cylinder 2 back into the outer cylinder 1, so that the plug-in block 101 enters the plug-in groove 102, hold the handle 3 and rotate the outer cylinder 1 and the inner cylinder 2 relatively, until the cleaning block 8 reaches the upper stopper 7 of the outer cylinder 1, so that the dovetail groove 9 of the inner cylinder 2 and the through hole 5 on the outer cylinder 1 are staggered, and the bottom of the outer cylinder 1 is sealed with the sealing plate 4. The close fit of the inner cylinder 2 and the outer cylinder 1 can prevent the reagent strip from being contaminated by contacting the oil-water mixture too early during the process of placing the device into the storage tank, thereby affecting the measurement result;

[0047] Slowly lower the device into the oil-water mixture in the storage tank until it reaches the bottom of the storage tank, and keep the device in a vertical position.

[0048] In the opposite direction to the first step, the handle 3 is also held to relatively rotate the inner cylinder 2 and the outer cylinder 1, so that the dovetail groove 9 of the inner cylinder 2 and the through hole 5 on the outer cylinder 1 are in the same orientation, or the cleaning block 8 of the inner cylinder 2 is located in the middle of the stopper 7 of the outer cylinder 1. In this process, due to the rotation of the inner cylinder 2, the two-way worm 103 rotates relatively, and then the worm gear sleeve 111 moves toward the two ends of the two-way worm 103, and the push plate 114 is pushed outward by the connecting rod 113. The push plate 114 is pushed outward, and the pull rope 121 pulls the clamping plate 123 inward, making it impossible to clamp the reagent strip, so that the reagent strip can be close to the inner wall of the through hole 5; at this time, the reagent strip is at the through hole 5 of the outer cylinder 1, and the oil-water mixture in the storage tank can penetrate into the reagent strip and react chemically with the reagent strip, thereby changing the contact part between the reagent strip and the water in the mixture. The color of the oil is changed, but the color of the part in contact with the oil does not change; wait for about 20 seconds, after sufficient reaction, rotate relative to the first step in the direction of rotation until the cleaning block 8 of the inner cylinder 2 contacts the stopper 7 on the outer cylinder 1. At this time, the through hole 5 of the outer cylinder 1 is sealed due to the tight fit between the inner cylinder 2 and the outer cylinder 1. At this time, due to the rotation of the inner cylinder 2, the two-way worm 103 rotates relatively, thereby causing the worm gear sleeve 111 to move to the opposite side, and the push plate 114 is pulled inwardly by the connecting rod 113. The inward movement of the push plate 114 will make the pull rope 121 loose and unable to pull the clamping plate 123, so that the clamping plate 123 clamps the reagent strip again under the action of the clamping spring 122, and the external oil-water mixture can no longer flow into the reagent strip in the dovetail groove 9, protecting the reagent strip from being contaminated during the process of taking the device out of the storage tank;

[0049] Take the device out of the storage tank, and wipe the residual liquid on the outside of the device with a rag; rotate in the opposite direction of the previous step, so that the dovetail groove 9 of the inner tube 2 and the through hole 5 on the outer tube 1 are in the same position, or the cleaning block 8 of the inner tube 2 is located in the middle of the stopper 7 of the outer tube 1; at this time, the reagent strip is at the through hole 5 of the outer tube 1, and the color change of the reagent strip is observed. The lower part changes color due to contact with water, and the upper part does not change due to contact with oil. The interface between the upper and lower parts is the oil-water interface; according to the indication of the scale 6 on the outer tube 1, it is the depth value of the oil-water interface in the crude oil storage tank;

[0050] Normally, the oil-water interface can be accurately measured in the previous step, but sometimes in order to avoid misjudgment, you can refer to the next embodiment to make reagent strips with different structures, and then through this step, you can fully meet the requirements for oil-water interface judgment in the oil field production process. Specifically, pull out the inner cylinder 2, and take out and unfold the multi-layered reagent strip from the dovetail groove 9. Because the reagent strip is a multi-layer structure, after multi-layer water penetration, a rectangular colored area appears on the reagent strip at this time. The boundary of this area is the boundary of the oil-water interface, which can avoid the outermost layer of the reagent strip from being misjudged due to oil contamination; according to the indication of the scale 6 on the outer cylinder 1, it is the depth value of the oil-water interface in the crude oil storage tank.

[0051] Embodiment 2:

[0052] This embodiment mainly describes the various methods for making the reagent strips commonly used in this device. The reagent strips made by the described methods can achieve better results in the actual oil-water interface determination. The specific implementation method is as follows: the water test agent is evenly applied to the surface of the cotton cloth through a steel mesh with a grid, so that the water test agent on the cotton cloth is not distributed in pieces but in a layer. Figure 7 As shown in the distribution, the density of the steel mesh can be slightly adjusted according to the physical properties of the oil-water mixture to be tested, and then the cotton cloth is folded into a cotton cloth roll with 5 to 6 layers, or a cotton cloth strip folded in half 3 to 4 times. On the one hand, the test strip made in this way has a large contact area with water and a wide interface distribution, thereby avoiding surface contamination and inaccurate testing; on the other hand, the test strip has a certain volume, which fully fills the dovetail groove 9 of the inner cylinder 2, and no oil-water mixture will remain after the inner cylinder 2 and the outer cylinder 1 rotate.

[0053] 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" 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 a limitation on the present invention.

[0054] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying 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 one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A handheld crude oil water interface measuring device, characterized in that: include: An outer cylinder (1), the inner wall of the outer cylinder (1) is slidably connected to the inner cylinder (2), the end of the inner cylinder (2) is fixedly connected to a handle (3), both sides of the inner cylinder (2) are provided with dovetail grooves (9), the inner wall of the dovetail grooves (9) is provided with a reagent strip, a sealing plate (4) is installed at the bottom of the outer cylinder (1), and a driving device (10) is installed on the side of the sealing plate (4) close to the inner cylinder (2), and the driving device (10) is used to drive the internal structure of the inner cylinder (2) to work; A pushing mechanism (11), the pushing mechanism (11) is installed inside the inner tube (2) and is slidably connected to the inner wall of the dovetail groove (9), the pushing mechanism (11) is driven by the driving device (10) to work, and the pushing mechanism (11) is used to push the reagent strip for testing; A clamping mechanism (12), the clamping mechanism (12) being installed inside the inner tube (2), the clamping mechanism (12) being driven by the pushing mechanism (11) and also driven by an external force, the clamping mechanism (12) being used to clamp the test strip to facilitate installation of the inner tube (2) and the outer tube (1); The driving device (10) comprises a plug-in block (101), a plug-in slot (102) and a bidirectional worm gear (103); the outer wall of the plug-in block (101) is in contact with the inner wall of the plug-in slot (102); the plug-in block (101) is configured as a hexagonal column; the plug-in slot (102) is configured as a hexagonal column; and the plug-in slot (102) is provided at one end of the bidirectional worm gear (103); The pushing mechanism (11) comprises a worm gear sleeve (111), a return spring (112), a connecting rod (113) and a push plate (114); the facing side of the worm gear sleeve (111) is fixedly connected to the end of the return spring (112), one end of the connecting rod (113) is connected to the outer side wall of the worm gear sleeve (111) via a bearing, and the side wall of the push plate (114) close to the central axis of the inner cylinder (2) is connected to the other end of the connecting rod (113) via a bearing.

2. A handheld crude oil water interface measuring device according to claim 1, characterized in that: The side wall of the outer cylinder (1) is symmetrically provided with a plurality of through holes (5), the outer side wall of the outer cylinder (1) is symmetrically provided with scales (6), the inner side wall of the dovetail groove (9) is slidably connected with a cleaning block (8), and the end of the outer cylinder (1) away from the sealing plate (4) is fixedly connected with a stopper (7).

3. A handheld crude oil water interface measuring device according to claim 1, characterized in that: The clamping mechanism (12) comprises a pull rope (121), a clamping spring (122), a clamping plate (123), an N-pole magnetic plate (124) and an S-pole magnetic plate (125); one end of the pull rope (121) is fixedly connected to the end of the clamping plate (123), one end of the clamping spring (122) is fixedly connected to the end of the clamping plate (123), the clamping spring (122) is sleeved on the outer wall of the pull rope (121), and the N-pole magnetic plate (124) and the S-pole magnetic plate (125) are arranged opposite to each other.

4. A handheld crude oil water interface measuring device according to claim 1, characterized in that: The end of the plug-in block (101) is fixedly connected to a side of the sealing plate (4) close to the inner cylinder (2), and the end of the bidirectional worm (103) is connected to the inner wall of the inner cylinder (2) via a bearing.

5. A handheld crude oil water interface measuring device according to claim 1, characterized in that: The inner wall of the worm gear sleeve (111) is meshed with the outer wall of the bidirectional worm (103), the return spring (112) is sleeved on the outer wall of the bidirectional worm (103), the outer wall of the push plate (114) is slidably connected to the inner wall of the dovetail groove (9), and the outer wall of the push plate (114) is in contact with the test strip.

6. A handheld crude oil water interface measuring device according to claim 3, characterized in that: The other end of the pull rope (121) is fixedly connected to the bottom of the push plate (114), the other end of the clamping spring (122) is fixedly connected to the inner wall of the inner cylinder (2), the outer wall of the clamping plate (123) is slidably connected to the inner wall of the inner cylinder (2), the top of the N-pole magnetic plate (124) is fixedly connected to the bottom of the push plate (114), and the bottom of the S-pole magnetic plate (125) is fixedly connected to the bottom of the inner wall of the dovetail groove (9).

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