Fluid property measurement apparatus and fluid property online measurement method

Abstract

The present disclosure provides a fluid property measurement apparatus and a fluid property online measurement method. The apparatus comprises: a measurement cylinder, provided with a fluid inlet and a fluid outlet; a liquid stabilizing mechanism, provided with a front liquid delivery structure and a gas conveying structure, the front liquid delivery structure being provided with a defoaming tank and a detachable pipe connected to the defoaming tank, the detachable pipe being connected to the fluid inlet, and the gas conveying structure being provided with a gas channel capable of injecting gas into the measurement cylinder; and a measurement mechanism, provided with a quality measurement device connected to the bottom of the measurement cylinder and a liquid level measurement device connected inside the measurement cylinder. The problem of performing online measurement on the density of a drilling fluid in the technical field of fluid detection is solved.

Description

Fluid performance detection device and fluid performance online detection method

[0001] Related applications

[0002] This application claims priority to Chinese patent application No. 202311843375.X filed on December 29, 2023, and cites the contents disclosed in the above patent application as part of this application. Technical Field

[0003] The present disclosure relates to the technical field of fluid detection, and in particular to a fluid performance detection device and a fluid performance online detection method. Background Art

[0004] The description in this section merely provides background information related to the disclosure of this application and does not constitute prior art.

[0005] In the field of fluid detection technology, the performance of fluids is generally expressed by parameters such as viscosity and density, which facilitates a quicker understanding of the state of the fluid from the physical properties of the liquid. Specifically in the field of drilling engineering, drilling fluid is used during drilling. When measuring the physical properties of the drilling fluid, it is found that the specific values ​​of the physical properties of the drilling fluid will show different changes under different temperature and pressure conditions. Specifically, for example, the density value of the drilling fluid will change to a certain extent under different temperature conditions or different pressure conditions; the density of the drilling fluid will have a certain impact on the stability of the downhole channel. In other cases, the performance parameters that will change also include the viscosity of the drilling fluid. Therefore, how to timely obtain the performance parameters of the drilling fluid in the drilling channel and understand the changing laws of the drilling fluid under changing temperature environments and changing pressure environments provide a huge safety guarantee for projects carrying out drilling operations under high temperature and high pressure environments.

[0006] In real-world construction environments, existing drilling fluid performance testing devices include a variety of devices for measuring liquid viscosity, such as speed meters and torque meters, all of which can measure drilling fluid viscosity. However, there are still many practical problems with devices for online density measurement of the fluid in the pipeline, making it impossible to use these devices at construction sites to directly measure the density of the drilling fluid online.

[0007] Existing drilling fluid density measuring devices mainly include the following categories: weighing density testers, Y-ray density testers, and Coriolis mass flowmeters. All three types of density measuring instruments can detect the density of drilling fluid. For example, the weighing density tester requires the drilling fluid to be taken out for measurement. Each measurement requires opening the pipeline, taking out a certain amount of drilling fluid for screening, and then sending it into the weighing density tester for measurement. However, the density performance parameters of the drilling fluid will change with the time it is away from the well environment, that is, it will be affected by changes in flow state, temperature, and pressure. If it is away from the original environment for too long, the measurement data will become invalid. The Y-ray density tester has high sensitivity, but due to its radioactivity, it is not suitable for environments with workers on site. The Coriolis mass flowmeter has high accuracy but poor reliability, and is also not suitable for harsh construction environments.

[0008] At the same time, in the process of measuring the performance parameters of drilling fluid at the construction site, it is not possible to simply consider setting up a separate set of equipment for measuring each performance parameter, because the on-site construction site is limited, and the structural improvement of the pipeline also needs to eliminate the problem of high structural instability caused by excessive structures. Therefore, if multiple performance parameters of drilling fluid can be measured in a set of structural equipment, it is also a difficulty encountered in this field. Summary of the Invention

[0009] The purpose of the embodiments of the present disclosure is to provide a fluid property detection device and a fluid property online detection method, which solve the problem of online measurement of the density of drilling fluid in the field of fluid detection technology.

[0010] The above-mentioned implementation objectives of the embodiments of the present disclosure are mainly achieved by the following technical solutions:

[0011] The present disclosure provides a method for online detection of fluid properties, which includes a density measurement method:

[0012] The detection cylinder is arranged on the output path of the liquid to be tested, so that the liquid to be tested continuously flows through the detection cylinder;

[0013] Passing positive pressure gas above the liquid to be tested in the detection cylinder to suppress fluctuations in the liquid level;

[0014] Obtaining the volume and mass of the liquid to be tested in the detection cylinder;

[0015] The density of the liquid to be measured is calculated according to the volume and the mass.

[0016] The present disclosure also provides a fluid performance detection device, comprising:

[0017] A detection cylinder having a fluid inlet and a fluid outlet;

[0018] The liquid stabilization mechanism comprises a front liquid delivery structure and a gas delivery structure, wherein the front liquid delivery structure comprises a defoaming tank and a detachable pipeline connected to the defoaming tank, wherein the detachable pipeline is connected to the fluid inlet; and the gas delivery structure comprises an airway capable of injecting gas into the detection cylinder;

[0019] The measuring mechanism comprises a mass detector connected to the bottom of the detection cylinder and a liquid level detector connected inside the detection cylinder.

[0020] Compared with the prior art, the technical solution disclosed in this disclosure has the following characteristics and advantages:

[0021] The fluid property detection device provided by the present disclosure adopts a detection cylinder to accommodate the liquid to be tested, and obtains the liquid weight and liquid volume through a measuring mechanism, thereby realizing online measurement of the density of the liquid under a certain temperature and pressure environment, that is, measuring the density of the drilling fluid immediately delivered from the drilling pipeline, avoiding the problem of denaturation caused by the drilling fluid being separated from the original temperature and pressure environment of the drilling pipeline, thereby rendering the measurement result invalid; further, the liquid to be tested is pre-processed by a liquid stabilization mechanism to reduce factors affecting the measurement result brought about by the direct delivery of the liquid to be tested from the original environment, that is, in this embodiment, the drilling fluid immediately delivered from the wellbore pipeline is pre-processed before measurement.

[0022] Furthermore, the fluid performance detection device provided by the present disclosure, by providing a first rotating structure, can enable the detection cylinder to have the function of measuring liquid viscosity in addition to the function of measuring density, thus solving the problem that existing viscosity measurement tools cannot achieve on-site online measurement. Furthermore, existing viscosity measurement and density measurement both require separate devices, which also means that if the performance parameters of the same liquid need to be obtained, the liquid needs to be sent to different measuring instruments in succession. This causes the liquid to be measured to change due to changes in the environment and time, causing the liquid properties to change, resulting in the inability to obtain accurate measurement results during the entire measurement process. The fluid performance detection device of this embodiment combines density detection and viscosity detection, so that the detection process occurs in the same detection cylinder, eliminating liquid degeneration errors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a structural diagram of a fluid performance detection device according to an embodiment of the present disclosure;

[0024] FIG2 is a structural diagram of a detachable structure of a fluid property detection device according to an embodiment of the present disclosure;

[0025] FIG3 is a structural diagram of a first embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0026] FIG4 is a structural diagram of a second embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0027] FIG5 is a structural diagram of a third embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0028] FIG6 is a structural diagram of a fourth embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0029] FIG7 is a structural diagram of a fifth embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0030] FIG8 is a structural diagram of a sixth embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0031] FIG9 is a structural diagram of a seventh embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0032] FIG10 is a structural diagram of an eighth embodiment of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0033] FIG11 is a top view of the interior of a detection cylinder of a fluid property detection device according to an embodiment of the present disclosure;

[0034] FIG12 is another internal top view of the detection cylinder of the fluid property detection device according to an embodiment of the present disclosure;

[0035] FIG13 is an internal top view of the righting structure of the fluid property detection device according to an embodiment of the present disclosure.

[0036] Explanation of the accompanying symbols: 1. Detection cylinder; 11. Fluid inlet; 12. Fluid outlet; 13. Slag trough; 2. Liquid stabilizing mechanism; 21. Pre-liquid feeding structure; 211. Defoaming tank; 2111. Liquid cavity; 2112. Gas cavity; 2113. Defoaming elastic membrane; 2114. Gas inlet; 2115. Liquid inlet; 2116. Liquid outlet; 212. Detachable pipeline; 2121. First pipeline; 2122. Second pipeline; 22. Gas delivery structure; 221. Air channel; 23. Detachable structure; 231. Sealing convex ring; 232. Sealing groove; 24. Bypass pipeline; 25. Three-way valve; 26. Stop plate; 27. One-way valve; 28. Hydraulic control system; 281. Shaft; 29. ​​Fixing point; 3. First rotating structure; 31. Rotating rod; 311. Hollow passage; 312. Air hole; 32. First rotating drum; 4. Air inlet pipe; 41. Inner passage; 5. Righting structure; 51. Righting seat; 511. Accommodating chamber; 512. Outer seat; 5121. Steam injection hole; 5122. Exhaust hole; 513. Inner seat; 514. Gas chamber; 52. Matching rod; 521. Air inlet hole; 53. Floating body; 531. Floating block; 54. Protective cover; 55. Speedometer; 56. First gas rod; 57. Second gas rod; 58. Third gas rod; 6. Damping structure; 61. Electromagnetic coil; 62. Damping elastic membrane; 7. Second rotating drum; 71. Flow hole; 72. Drive motor; 8. choke tube; 81. choke plate; 82. steam injection ring cavity; 83. choke hole; 84. choke elastic membrane; 9. measuring mechanism; 91. mass detector; 92. liquid level detector; α, angle. DETAILED DESCRIPTION

[0037] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts should fall within the scope of protection of the present disclosure.

[0038] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or there may be an element centered thereon. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or there may be an element centered thereon. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this disclosure pertains. The terms used herein in the specification of this disclosure are for the purpose of describing specific embodiments only and are not intended to limit this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0040] As shown in FIG1 and FIG10 , an embodiment of the present disclosure provides a fluid performance detection device, comprising:

[0041] The detection cylinder 1 has a fluid inlet 11 and a fluid outlet 12;

[0042] The liquid stabilization mechanism 2 comprises a front liquid delivery structure 21 and a gas delivery structure 22. The front liquid delivery structure comprises a defoaming tank 211 and a detachable pipeline 212 connected to the defoaming tank 211, and the detachable pipeline 212 is connected to the fluid inlet 11. The gas delivery structure 22 comprises an airway 221 capable of injecting gas into the detection cylinder 1.

[0043] The measuring mechanism 9 comprises a mass detector 91 connected to the bottom of the detection cylinder 1 and a liquid level detector 92 connected inside the detection cylinder 1 .

[0044] The fluid performance detection device provided in the embodiment of the present disclosure adopts a detection cylinder 1 to accommodate the liquid to be tested, and obtains the liquid weight and liquid volume through a measuring mechanism 9, thereby realizing online measurement of the density of the liquid under a certain temperature and pressure environment, that is, measuring the density of the drilling fluid immediately delivered from the drilling pipeline, thereby avoiding the problem of denaturation caused by the drilling fluid being separated from the original temperature and pressure environment of the drilling pipeline, thereby rendering the measurement result invalid; further, the liquid to be tested is pre-processed by the liquid stabilizing mechanism 2 to reduce the factors affecting the measurement result brought about by the direct delivery of the liquid to be tested from the original environment, that is, in this embodiment, the drilling fluid immediately delivered from the wellbore pipeline is pre-processed before measurement; in some embodiments, the pre-processing includes: Defoaming treatment is performed on bubbles generated during the transportation process of viscous liquids such as drilling fluid; through the disconnection setting of the detachable pipeline 212, the vibration influence of other construction equipment on the mass detector 91 or the liquid level detector 92 is eliminated when the fluid performance detection device measures the density. The detachable pipeline 212 in this embodiment can disconnect the connection between the drilling pipeline and the delivery pump and the detection cylinder 1 to reduce the vibration influence of the construction equipment in the wellbore pipeline on the detection cylinder 1; it also includes injecting gas into the detection cylinder 1 through the gas delivery structure 22, which can achieve the purpose of controlling the liquid level height of the liquid to be tested in the detection cylinder 1; it also includes the purpose of suppressing the liquid level fluctuation in the detection cylinder 1 by the air cushion formed by gas, so as to better measure the liquid level height in the detection cylinder 1 and achieve the purpose of more accurately calculating the volume of the liquid to be tested.

[0045] As an example, the detection cylinder 1 is generally a cylinder with an open top, and the fluid inlet 11 and the fluid outlet 12 are both arranged at the lower part of the detection cylinder 1. The liquid to be tested flows into the detection cylinder 1 from the fluid inlet 11 and flows out from the fluid outlet 12. The pre-liquid delivery structure 21 of the liquid stabilizing mechanism 2 is arranged upstream of the detection cylinder 1. The pre-liquid delivery structure 21 is connected between the wellbore pipeline and the detection cylinder 1. The pre-liquid delivery structure 21 has a connected defoaming tank 211 and a detachable pipeline 212. The pre-liquid delivery structure 21 is detachable. The disassembly pipeline 212 is connected to the fluid inlet 11, and the defoaming tank 211 of the front liquid delivery structure 21 is connected to the wellbore pipeline. The liquid to be tested is injected into the detection cylinder 1 from the wellbore pipeline through the defoaming tank 211, the detachable pipeline 212 and the fluid inlet 11 in sequence; the gas delivery structure 22 of this embodiment is connected to the detection cylinder 1 from the upper part of the detection cylinder 1, and the air channel 221 of the gas delivery structure 22 is connected to the detection cylinder 1. The gas is injected into the detection cylinder 1 from the air channel 221. The opening of the air channel 221 of this embodiment It is set higher than the liquid level in the detection cylinder 1 to prevent the gas injected from the air channel 221 from introducing new bubbles into the liquid to be tested; the mass detector 91 of the measuring mechanism 9 is set at the bottom of the detection cylinder 1 to weigh the weight of the entire detection cylinder 1 and the liquid to be tested. In this embodiment, the mass detector 91 is a weighing scale connected to the bottom of the detection cylinder 1 and supports the detection cylinder 1. In other embodiments, the mass detector 91 can also be a sleeve structure, which is sleeved on the outside of the detection cylinder 1. The bottom of the sleeve structure and the bottom of the detection cylinder 1 are connected through the weighing scale to weigh the weight of the detection cylinder 1 and the liquid to be tested. The sleeve structure avoids the deviation of the detection cylinder 1 relative to the weighing scale, which causes inaccurate measurement results. There is no specific limitation on the structure of the mass detector 91; the liquid level detector 92 is set on the inner wall of the detection cylinder 1. The measuring range of the liquid level detector 92 includes the bottom end to the top end of the detection cylinder 1. By measuring the liquid level height of the liquid to be tested in the detection cylinder 1, the volume of the liquid to be tested can be directly calculated.

[0046] In one embodiment, as shown in Figures 1 and 2, the detachable pipeline 212 includes a first pipeline 2121 and a second pipeline 2122 that are connected to each other. The first pipeline 2121 is connected to the defoaming tank 211, and the second pipeline 2122 is connected to the fluid inlet 11. A detachable structure 23 is connected between the first pipeline 2121 and the second pipeline 2122. The detachable structure 23 has a sealing protrusion 231 and a sealing groove 232 that can be clamped together.

[0047] The fluid property testing device provided in the embodiment of the present disclosure adopts a two-stage detachable pipeline structure. When the liquid to be tested is injected into the test cylinder 1, the first pipeline 2121 and the second pipeline 2122 are connected to inject the liquid to be tested from the defoaming tank 211 into the test cylinder 1; when the test cylinder 1 is measuring the density of the liquid to be tested, the first pipeline 2121 and the second pipeline 2122 are disconnected, thereby preventing the vibration generated by the wellbore pipeline and the delivery pump in the working state from being transmitted to the test cylinder 1 through the pipeline, thereby affecting the measurement results of the mass detector 91 and the liquid level detector 92.

[0048] As an example, the front end of the second pipeline 2122 is connected to the fluid inlet 11, and a one-way valve 27 is provided at the fluid inlet 11 to prevent the liquid in the detection cylinder 1 from flowing back from the fluid inlet 11 into the second pipeline 2122. The tail end of the second pipeline 2122 is detachably connected to the front end of the first pipeline 2121, and the tail end of the first pipeline 2121 is connected to the defoaming tank 211; the first pipeline 2121 of this embodiment can move back and forth along the axial direction of the first pipeline 2121 in a direction away from or close to the second pipeline 2122 to achieve separation or connection between the first pipeline 2121 and the second pipeline 2122; in some embodiments, the first pipeline 2121 The movement of 21 is achieved through the hydraulic control system 28. A fixed point 29 is provided on the outside of the first pipeline 2121. The shaft 281 of the hydraulic control system 28 is connected to the fixed point 29. When the hydraulic control system 28 drives the shaft 281, the first pipeline 2121 moves along the axial direction of the first pipeline 2121. In other embodiments, the movement of the first pipeline 2121 can also be achieved by a servo motor. The output shaft of the servo motor is engaged with the first pipeline 2121 to drive the first pipeline 2121 to move along the axial direction of the first pipeline 2121. There is no specific restriction on the specific method of driving the first pipeline 2121.

[0049] In this embodiment, the outer diameter of the front end of the first pipeline 2121 gradually decreases toward the direction approaching the second pipeline 2122, and the inner diameter of the second pipeline 2122 gradually increases toward the direction approaching the first pipeline 2121, so as to facilitate the sealed connection between the first pipeline 2121 and the second pipeline 2122; further, in this embodiment, the angle between the outer surface of the front end of the first pipeline 2121 and the axial direction of the first pipeline 2121 is in the range of 1.3 to 2.6°, and the angle between the outer surface of the front end of the first pipeline 2121 and the axial direction of the first pipeline 2121 is in the range of 2.1 to 2.9°, so as to achieve a better sealed insertion connection between the first pipeline 2121 and the second pipeline 2122. In other embodiments, the inner diameter of the front end of the first pipeline 2121 may gradually increase toward the second pipeline 2122, and the outer diameter of the second pipeline 2122 may gradually decrease toward the first pipeline 2121, so that the second pipeline 2122 can be plugged into the first pipeline 2121. The plug-in relationship between the first pipeline 2121 and the second pipeline 2122 is not specifically limited. Furthermore, a detachable structure 23 is provided between the front end of the first pipeline 2121 and the rear end of the second pipeline 2122. The sealing protrusion 231 and the sealing groove 232 of the detachable structure 23 respectively connect the front end of the first pipeline 2121 and the rear end of the second pipeline 2122. The mating connection between the sealing protrusion 231 and the sealing groove 232 limits the relative displacement of the first pipeline 2121 and the second pipeline 2122, while simultaneously sealing the gap between the first pipeline 2121 and the second pipeline 2122.

[0050] In some embodiments, as shown in Figure 2, the sealing protrusion 231 is connected to the outer wall of the first pipeline 2121, and the sealing groove 232 is connected to the inner wall of the second pipeline 2122; or, the sealing protrusion 231 is connected to the inner wall of the second pipeline 2122, and the sealing groove 232 is connected to the outer wall of the first pipeline 2121.

[0051] The fluid performance detection device provided in the embodiment of the present disclosure directly solves the problem of movement limitation and sealing of the first pipeline 2121 and the second pipeline 2122 during the matching connection process by arranging the sealing protrusion 231 and the sealing groove 232 of the detachable structure 23 on the first pipeline 2121 and the second pipeline 2122 respectively.

[0052] Optionally, there are two embodiments for setting the detachable structure 23. As an example, a plurality of sealing rings 231 are arranged on the outer wall of the first pipeline 2121 at intervals along the axial direction of the first pipeline 2121, and a plurality of sealing grooves 232 are arranged on the inner wall of the second pipeline 2122 at intervals along the axial direction of the second pipeline 2122; as another example, a plurality of sealing rings 231 are arranged on the outer wall of the second pipeline 2122 at intervals along the axial direction of the second pipeline 2122, and a plurality of sealing grooves 232 are arranged on the inner wall of the first pipeline 2121 at intervals along the axial direction of the first pipeline 2121; in other embodiments, there is no specific restriction on the setting method of the plurality of sealing rings 231 and the sealing grooves 232; in this embodiment, when the first pipeline 2121 and the second pipeline 2122 are sealed and connected, the plurality of sealing rings 231 are respectively placed in the sealing grooves 232 corresponding to each sealing ring 231.

[0053] In some embodiments, as shown in FIG. 1 , the defoaming tank 211 has a liquid cavity 2111 and an air cavity 2112 that are isolated from each other. The air cavity 2112 is configured to apply pressure to the liquid cavity 2111 to change the volume of the liquid cavity 2111 .

[0054] The fluid performance detection device provided in the embodiment of the present disclosure, by providing a defoaming tank 211, enables the liquid output from the wellbore pipeline to be defoamed in the defoaming tank 211 and reduce the flow rate, thereby avoiding the problem that the liquid extracted from the wellbore pipeline is directly transported to the detection cylinder 1, thereby causing the defoaming time required in the detection cylinder 1 to be too long and the liquid to be tested to produce a denaturation reaction, and also avoids the liquid extracted from the wellbore pipeline from impacting the detection cylinder 1 due to an excessively high flow rate, resulting in the liquid continuously impacting the mass detector 91 and the liquid level detector 92 of the measuring mechanism 9. , thereby affecting the reading of the measurement results of the mass detector 91 and the liquid level detector 92; at the same time, this embodiment provides an air cavity 2112 and a liquid cavity 2111 in the defoaming tank 211, so as to facilitate the liquid in the defoaming tank 211 to flow from the defoaming tank 211 to the detection cylinder 1; further, the air cavity 2112 can apply pressure to the liquid cavity 2111 and change the volume of the liquid cavity 2111, so that the liquid flowing from the liquid cavity 2111 to the detection cylinder 1 can maintain a certain required liquid pressure and liquid flow rate, thereby keeping the liquid to be measured in a state to be measured.

[0055] Exemplarily, the defoaming tank 211 is arranged between the detachable pipeline 212 and the wellbore pipeline. The upper part of the inner cavity of the defoaming tank 211 is the air cavity 2112, and the lower part of the inner cavity of the defoaming tank 211 is the liquid cavity 2111. In this embodiment, the defoaming tank 211 is connected to the wellbore pipeline through the liquid inlet 2115. The liquid is extracted from the wellbore pipeline and injected into the defoaming tank 211 by the delivery pump. The flow rate of the liquid decreases, and the gas entrained in the liquid floats up and separates from the liquid under the state of reduced flow rate, and enters the air cavity 2112 of the defoaming tank 211. The gas in the air cavity 2112 gives the liquid in the liquid cavity 2111 a basic pressure to prevent the liquid pressure in the liquid cavity 2111 from being too low, and at the same time squeezes the liquid in the liquid cavity 2111 to flow into the detection cylinder 1.

[0056] In some embodiments, as shown in FIG. 1 , a defoaming elastic membrane 2113 is connected to the defoaming tank 211 , and the liquid cavity 2111 and the air cavity 2112 are separated by the defoaming elastic membrane 2113 .

[0057] The fluid performance detection device provided in the embodiment of the present disclosure isolates the liquid cavity 2111 from the air cavity 2112 through a defoaming elastic membrane 2113, and injects a fixed amount of pressurized gas into the air cavity 2112, so that the liquid in the liquid cavity 2111 flows toward the detection cylinder 1 at a fixed flow rate under the action of the squeezing or contraction of the air cavity 2112; it also realizes the dynamic adjustment of the gas injection amount in the air cavity 2112 according to demand, so that the pressure exerted by the gas in the air cavity 2112 on the liquid in the liquid cavity 2111 changes, thereby realizing the dynamic adjustment of the flow rate of the liquid flowing to the detection cylinder 1. The fluid performance detection device provided by the embodiment of the present disclosure avoids the problem that the gas in the air cavity 2112 gradually increases in an unknown amount during the liquid defoaming process, resulting in a change in the gas pressure in the air cavity 2112, that is, the pressure exerted by the gas in the air cavity 2112 on the liquid in the liquid cavity 2111 is unpredictable, thereby causing the flow rate of the liquid injected from the liquid cavity 2111 into the detection cylinder 1 to gradually increase; at the same time, the air cavity 2112 and the liquid cavity 2111 are isolated from each other by the defoaming elastic membrane 2113, and the gas floating out of the liquid can be accurately discharged from the fluid performance detection device through other means, thereby avoiding the influence of the gas generated by defoaming on the control of the defoaming tank 211.

[0058] As an example, the defoaming elastic membrane 2113 is generally an elastic membrane structure. The material of the defoaming elastic membrane 2113 of this embodiment is an oleophobic and hydrophobic rubber material. In other embodiments, there is no restriction on the specific material of the defoaming elastic membrane 2113; the defoaming elastic membrane 2113 is connected to the inner wall of the defoaming tank 211 on all sides, and the defoaming elastic membrane 2113 divides the inner cavity of the defoaming tank 211 into an air cavity 2112 and a liquid cavity 2111 isolated from each other. The air cavity 2112 is located above the liquid cavity 2111. In this embodiment, the liquid inlet 2115 and the liquid outlet 2116 of the defoaming tank 211 are both connected to the liquid cavity 2111, the liquid inlet 2115 of the defoaming tank 211 is connected to the wellbore pipeline, and the liquid outlet 2116 of the defoaming tank 211 is connected to the detachable pipeline 212. In some embodiments, the amount of gas in the air cavity 2112 is fixed. When the liquid pressure in the liquid cavity 2111 changes, the defoaming elastic membrane 2113 bulges toward the liquid cavity 2111 or contracts away from the liquid cavity 2111 to change the volume of the liquid cavity 2111. Furthermore, the pressure exerted by the air cavity 2112 on the liquid cavity 2111 is transmitted through the defoaming elastic membrane 2113, that is, the defoaming elastic membrane 2113 squeezes the liquid in the liquid cavity 2111 to push the liquid in the liquid cavity 2111 to flow toward the detection cylinder 1.

[0059] In some embodiments, as shown in Figure 1, the defoaming tank 211 has a gas inlet 2114, a liquid inlet 2115 and a liquid outlet 2116, the gas inlet 2114 is connected to the gas cavity 2112, the liquid inlet 2115 and the liquid outlet 2116 are respectively connected to the liquid cavity 2111, and the detachable pipeline 212 is connected to the liquid outlet 2116.

[0060] The fluid performance detection device provided in the embodiment of the present disclosure sets up a liquid inlet 2115 and a liquid outlet 2116 so that the liquid transported from the wellbore pipeline to the detection tube 1 can be retained and defoamed in the defoaming tank 211. By setting up a gas inlet 2114, the amount of gas injected into the gas cavity 2112 can be dynamically adjusted. According to the measurement requirements, the pressure of the gas cavity 2112 on the liquid in the liquid cavity 2111 can be dynamically adjusted to control the flow rate of the liquid, avoid excessively high flow rates that may cause bubbles to form during the flow of the liquid, and avoid excessively low flow rates that may cause the liquid to stagnate in the defoaming tank 211 and degenerate into a highly viscous state, resulting in the problem that the liquid cannot flow normally to the detection tube 1 and the problem that the measurement results are invalid due to the degeneration of the liquid.

[0061] Exemplarily, the liquid inlet 2115 and the liquid outlet 2116 are connected to the liquid cavity 2111, the liquid inlet 2115 is arranged in the middle or upper part of the liquid cavity 2111, the liquid inlet 2115 is connected to the wellbore pipeline, and the liquid outlet 2116 is arranged at the bottom of the liquid cavity 2111 to provide a certain condensation and floating space for the bubbles to float up, so as to avoid the liquid entering the defoaming tank 211 being directly injected into the detection cylinder 1 before it has time to defoam. In this embodiment, the liquid outlet 2116 is connected to the first pipeline 2121; the gas inlet 2114 is connected to the air cavity 2112, and gas is injected into the air cavity 2112 through the gas inlet 2114 to change the air pressure of the air cavity 2112, so that the air cavity 2112 exerts pressure on the liquid cavity 2111. pressure to change the volume of the liquid cavity 2111; in this embodiment, the air cavity 2112 and the liquid cavity 2111 are separated by the defoaming elastic membrane 2113, and in other embodiments, the air cavity 2112 is connected to the liquid cavity 2111, and there is no specific limitation on this; in this embodiment, the gas inlet 2114 is arranged at the top of the air cavity 2112, and in other embodiments, there is no specific limitation on the position of the gas inlet 2114 in the air cavity 2112; in other embodiments, the defoaming tank 211 further has a gas outlet, and the gas in the air cavity 2112 is discharged from the gas outlet to reduce the air pressure in the air cavity 2112, reduce the pressure exerted by the air cavity 2112 on the liquid cavity 2111, and reduce the flow rate of the liquid in the liquid cavity 2111.

[0062] In some embodiments, as shown in FIG1 , a bypass line 24 is connected to the first line 2121 , and a three-way valve 25 is connected between the bypass line 24 and the first line 2121 . The three-way valve 25 can return the liquid flowing through the first line 2121 to the wellbore line through the bypass line 24 .

[0063] The fluid property testing device provided by the embodiment of the present disclosure, through the provision of the bypass line 24 and the three-way valve 25, allows the liquid extracted from the wellbore pipeline into the defoaming tank 211 to maintain continuous flow when the test cylinder 1 is performing density measurement and the first line 2121 is disconnected from the second line 2122. This avoids the problem of the liquid in the defoaming tank 211 and the liquid in the first line 2121 ceasing to flow due to the disconnection between the first line 2121 and the second line 2122, which would cause the liquid to deform, increase its viscosity, and weaken its fluidity. Even if the liquid delivery is subsequently restarted, the highly viscous liquid would block the newly injected liquid, requiring a long flushing and cleaning time to clear the defoaming tank 211 and the first line 2121, so that the liquid to be tested in the test cylinder 1 is the liquid extracted immediately, thereby avoiding the problem of the denatured liquid mixing into the test cylinder 1 and causing the measurement result to be invalid. At the same time, excessive flushing time will also affect the overall measurement efficiency of the fluid property testing device.

[0064] For example, the three-way valve 25 of this embodiment is arranged at the front end of the first pipeline 2121, and the bypass pipeline 24 is connected to the first pipeline 2121 through the three-way valve 25. The three-way valve 25 has a switchable first passage and a second passage, wherein the first passage is a passage for connecting the first pipeline 2121 to the second pipeline 2122, and the second passage is a passage for connecting the first pipeline 2121 to the bypass pipeline 24; when the three-way valve 25 is in the state of the first passage, the liquid flows from the first pipeline 2121 to the second pipeline 2122. pipeline 2122, and the bypass pipeline 24 is not connected to the first pipeline 2121; when the three-way valve 25 is in the state of the second passage, the liquid flows from the first pipeline 2121 to the bypass pipeline 24, and the second pipeline 2122 is not connected to the first pipeline 2121. When the three-way valve 25 is in the state of the second passage, the wellbore pipeline, the defoaming tank 211, the first pipeline 2121, the bypass pipeline 24 and the wellbore pipeline constitute a delivery pipeline, so that the liquid in the delivery pipeline is in a continuous flow state.

[0065] In some embodiments, as shown in FIG3 , the detection cylinder 1 can accommodate the liquid to be tested, and the outlet of the air channel 221 is arranged close to the liquid surface of the liquid to be tested.

[0066] The fluid property detection device provided in the embodiment of the present disclosure arranges the outlet of the air channel 221 near the liquid level of the liquid in the detection cylinder 1, so that the gas in the air channel 221 can form an air cushion layer above the liquid level, thereby smoothing the liquid level fluctuation of the liquid to be tested in the detection cylinder 1, avoiding the problem of continuous fluctuation of the liquid level due to the flow of liquid in the detection cylinder 1, and solving the problem of inaccurate value read by the liquid level detector 92 due to the influence of liquid level fluctuation.

[0067] Illustratively, the detection cylinder 1 is generally of a cylindrical structure, and the cavity inside the detection cylinder 1 is used to accommodate the liquid to be tested. The gas is input into the cavity of the detection cylinder 1 from the air channel 221, and the outlet of the air channel 221 is used to transport the gas to above the liquid surface of the liquid to be tested. The outlet of the air channel 221 is arranged toward the liquid surface of the liquid to be tested; in another embodiment, the gas flow can also be arranged parallel to the liquid surface of the liquid to be tested; in other embodiments, the direction of the outlet of the air channel 221 can also be arranged at a certain angle to the liquid surface of the liquid to be tested, and no specific requirements are made for this; in this embodiment, by controlling the total amount of gas in the space above the liquid surface of the detection cylinder 1, the gas pressure above the liquid surface of the detection cylinder 1 is controlled, so that the gas at a certain pressure continuously applies pressure to the liquid surface of the liquid to be tested to reduce the liquid surface fluctuation phenomenon of the liquid to be tested.

[0068] In some embodiments, as shown in FIG. 4 , a stopper plate 26 is provided above the outlet of the air passage 221 , and the outer diameter of the stopper plate 26 is smaller than the inner diameter of the detection cylinder 1 .

[0069] The fluid performance detection device provided by the embodiment of the present disclosure, by arranging the stop plate 26 above the outlet of the air channel 221, limits the gas output from the outlet of the air channel 221 from moving in a direction away from the liquid level of the liquid to be tested in the detection tube 1, that is, moving above the detection tube 1; more gas is gathered between the stop plate 26 and the liquid level of the liquid to be tested, so that the pressure of the gas between the stop plate 26 and the liquid level of the liquid to be tested is increased, and then the gas can form an air cushion layer below the stop plate 26, which is used to smooth the liquid level of the liquid to be tested in the detection tube 1, avoid fluctuations in the liquid level of the liquid to be tested, and affect the measurement of the liquid level detector 92. At the same time, the area size of the stop plate 26 can more conveniently generate an air cushion layer, thereby increasing the smoothing effect of the gas on the liquid level of the liquid to be tested.

[0070] Exemplarily, the stop plate 26 is arranged to match the cross-sectional shape of the detection cylinder 1. The stop plate 26 of this embodiment is circular. In other embodiments, the shape of the stop plate 26 can also be other shapes, and there is no specific limitation on this; the stop plate 26 is arranged parallel to the liquid surface of the detection cylinder 1. The stop plate 26 of this embodiment is connected to the air inlet pipe 4. In other embodiments, the stop plate 26 can also be connected to the inner wall of the detection cylinder 1, and there is no specific limitation on this; in this embodiment, there is a gap between the stop plate 26 and the detection cylinder 1 to prevent the gas injected into the detection cylinder 1 from the airway 221 from being sealed under the stop plate 26, causing the effect of the air cushion layer to be affected by the pressure change caused by the gas injection. The outer diameter of the stop plate 26 is smaller than the inner diameter of the detection cylinder 1, so that a gas channel is maintained between the stop plate 26 and the detection cylinder 1.

[0071] In some embodiments, as shown in FIG1 , an air inlet pipe 4 is inserted into the detection cylinder 1. An inner channel 41 of the air inlet pipe 4 forms the air channel 221, and an outlet of the air inlet pipe 4 forms the outlet of the air channel 221. Alternatively, a plurality of air holes 312 are formed on the outer wall of the air inlet pipe 4, and the plurality of air holes 312 form the outlet of the air channel 221. The fluid property detection device provided in the embodiments of the present disclosure uses the air inlet pipe 4 to input air into the inner wall of the detection cylinder 1, thereby smoothing fluctuations in the liquid level of the liquid to be tested in the detection cylinder 1.

[0072] Illustratively, the gas delivery structure 22 in this embodiment is an air inlet pipe 4, which is a circular tube structure. In other embodiments, there is no specific restriction on the structure of the air inlet pipe 4; the air channel 221 is formed in the inner channel 41 of the air inlet pipe 4, and both ends of the air inlet pipe 4 are open, and the openings at both ends of the air inlet pipe 4 are connected to the inner channel 41 of the air inlet pipe 4. One end of the air inlet pipe 4 is inserted into the detection cylinder 1, and the opening of the end of the air inlet pipe 4 inserted into the detection cylinder 1 is the opening of the inner channel 41. The opening of the inner channel 41 is arranged close to the liquid level of the liquid to be tested, and the opening of the inner channel 41 is the outlet of the air channel 221; in this embodiment, the opening of the inner channel 41 is arranged toward the liquid level of the liquid to be tested in the detection cylinder 1. In other embodiments, the direction of the opening of the inner channel 41 can also be arranged parallel to the liquid level of the liquid to be tested. In another other embodiment, the direction of the opening of the inner channel 41 can also be arranged at a certain angle to the liquid level of the liquid to be tested, and there is no specific restriction on this.

[0073] In another embodiment, the end of the air inlet pipe 4 inserted into the detection cylinder 1 can also be closed, and a plurality of air holes 312 are provided on the side wall of the end of the air inlet pipe 4 inserted into the detection cylinder 1. The plurality of air holes 312 are arranged at intervals along the circumference of the air inlet pipe 4, and the inner channel 41 is connected to the plurality of air holes 312. The plurality of air holes 312 constitute the outlet of the air channel 221. In this embodiment, the opening direction of the plurality of air holes 312 is arranged parallel to the liquid level of the liquid to be tested. In other embodiments, the opening direction of the plurality of air holes 312 can also be arranged toward the liquid level of the liquid to be tested. In another other embodiment, the outlet of the air channel 221 can also be arranged at a certain angle to the liquid level of the liquid to be tested. There is no limitation on the specific arrangement of the outlet of the air channel 221. In other embodiments, the air channel 221 can also be arranged in other structures. There is no limitation on the specific structure of the air pipe.

[0074] According to the above-mentioned fluid property detection device, in one embodiment of the present application, a fluid property detection method is provided, the method comprising:

[0075] The test tube 1 is positioned in the output path of the test liquid so that the test liquid continuously flows through the test tube 1. Positive pressure gas is introduced above the test liquid in the test tube 1 to suppress fluctuations in the liquid level. The volume and mass of the test liquid in the test tube 1 are obtained. The density of the test liquid is calculated based on the volume and mass.

[0076] The method for obtaining the volume of the liquid to be tested in the detection cylinder 1 includes: obtaining the liquid level value of the liquid to be tested in the detection cylinder; and obtaining the volume of the liquid to be tested in the detection cylinder according to the liquid level value and the cross-sectional area of ​​the detection cylinder.

[0077] Among them, the method for obtaining the mass of the liquid to be tested in the detection cylinder 1 includes: obtaining a first mass when there is no liquid to be tested in the detection cylinder; obtaining a second mass of the detection cylinder when the liquid to be tested continues to flow through the detection cylinder and the liquid level height is stable; and obtaining the mass of the drilling fluid to be tested in the detection cylinder based on the difference between the first mass and the second mass.

[0078] As an example, the first weight of the detection cylinder 1 in a state where no liquid to be tested is injected is obtained by the mass detector 91;

[0079] The liquid to be tested is drawn from the wellbore pipeline and injected into the detection cylinder 1 through the defoaming tank 211, the first pipeline 2121, the second pipeline 2122, and the fluid inlet 11 in sequence. A certain pressure gas is injected into the detection cylinder 1 through the air channel 221 to balance the liquid level of the liquid to be tested in the detection cylinder 1. When the liquid level of the liquid to be tested is stable, the second weight of the detection cylinder 1 is measured by the mass detector 91, and the liquid level in the detection cylinder 1 is measured by the liquid level detector 92.

[0080] The liquid density of the liquid to be tested in this state is obtained according to the cross-sectional area of ​​the detection tube 1 .

[0081] In some embodiments, as shown in Figure 3, the fluid performance detection device also includes a first rotating structure 3, the first rotating structure 3 has a rotating rod 31 and a first rotating cylinder 32 connected to the rotating rod 31, and the first rotating cylinder 32 extends into the detection cylinder 1; a hollow channel 311 is formed in the rotating rod 31, and the hollow channel 311 is formed as an air channel 221. A plurality of air holes 312 connected to the hollow channel 311 are opened on the outer wall of the rotating rod 31, and the plurality of air holes 312 form an outlet of the air channel 221.

[0082] The fluid performance detection device provided by the embodiment of the present disclosure, by providing a first rotating structure 3, can enable the detection tube 1 to have the function of measuring liquid viscosity in addition to the function of measuring density, thereby solving the problem that existing viscosity measurement tools cannot achieve on-site online measurement. Furthermore, existing viscosity measurement and density measurement both require separate devices, which also means that if the performance parameters of the same liquid need to be obtained, the liquid needs to be sent to different measuring instruments in succession. This causes the liquid to be measured to change due to changes in the environment and time, causing the liquid properties to change, resulting in the inability to obtain accurate measurement results during the entire measurement process. The fluid performance detection device of this embodiment combines density detection and viscosity detection, so that the detection process occurs in the same detection tube 1, eliminating liquid denaturation errors.

[0083] As an example, the rotating rod 31 of the first rotating structure 3 of this embodiment is generally cylindrical and arranged along the axial direction of the detection cylinder 1. One end of the rotating rod 31 is inserted into the detection cylinder 1, and the other end of the rotating rod 31 is arranged to extend out of the detection cylinder 1. The first rotating cylinder 32 is connected to the end of the rotating rod 31 inserted into the detection cylinder 1, that is, the lower end of the rotating rod 31. The first rotating cylinder 32 of this embodiment is generally spindle-shaped. In other embodiments, the first rotating cylinder 32 can also be a spindle-shaped structure with a cavity inside. There is no specific limitation on the structure of the first rotating cylinder 32. The outer diameter of the first rotating cylinder 32 is smaller than the inner diameter of the detection cylinder 1, so that an annulus is formed between the first rotating cylinder 32 and the detection cylinder 1. The liquid to be tested can be filled in the annulus between the first rotating cylinder 32 and the detection cylinder 1. The first rotating drum 32 of this embodiment is entirely located below the liquid surface of the liquid to be measured. Furthermore, to prevent the formation of vortices in the liquid to be measured caused by the rotation of the first rotating drum 32, which in turn may affect the viscosity measurement results of the liquid to be measured, the depth of the first rotating drum 32 below the liquid surface of the liquid to be measured in this embodiment is 3 to 5 times the height of the first rotating drum 32 itself. It should be noted that the depth of the first rotating drum 32 below the liquid surface of the liquid to be measured is the distance between the bottom of the first rotating drum 32 and the liquid surface of the liquid to be measured.

[0084] The online viscosity measurement method of this embodiment is as follows: an initial preset rotational speed is given to the first rotating drum 32, which rotates and drives the liquid to be measured. After the rotation stabilizes, the power supplied to the first rotating drum 32 is removed. The viscosity of the liquid to be measured is calculated by measuring parameters such as the decay rate of the first rotating drum 32. This calculation method is one form of existing liquid viscosity measurement methods. In other embodiments, other similar calculation methods can also be used, and this is not specifically limited. In the online density measurement method of this embodiment, the volume of the liquid to be measured is calculated by combining the liquid level, the volume of the first rotating drum 32, and the volume of the rotating rod 31 below the liquid level.

[0085] The cam 312 is a kind of airtight seal which is provided on the outer wall of the cam 31 and is convenient to use and can be used for sealing the cam 312. The cam 312 is a kind of airtight seal which is provided on the outer wall of the cam 31 and is convenient to use and can be used for sealing the cam 312. The liquid level height, that is, a certain amount of gas is injected into the detection cylinder 1 through the air channel 221. When the injection amount of the liquid to be tested increases and the liquid pressure increases, the liquid level height of the liquid to be tested in the detection cylinder 1 rises, the gas space above the detection cylinder 1 is compressed, and the gas pressure on the liquid to be tested increases, which to a certain extent suppresses the rise of the liquid level of the liquid to be tested and balances the pressure increase of the liquid to be tested. When the injection amount of the liquid to be tested decreases and the liquid pressure decreases, the liquid level height of the liquid to be tested in the detection cylinder 1 decreases, the gas space above the detection cylinder 1 expands, and the gas pressure on the liquid to be tested decreases, which to a certain extent slows down the liquid level drop speed of the liquid to be tested and balances the pressure decrease of the liquid to be tested, thereby achieving the effect of compensating the liquid level height of the liquid to be tested and avoiding the problem that the liquid level height is affected by the power change of the delivery pump located in the wellbore pipeline, which causes the pressure of the liquid pumped by the delivery pump to change, resulting in the fluctuation of the liquid level height of the liquid to be tested in the detection cylinder 1. In other embodiments, the amount of positive pressure gas injected into the detection cylinder 1 through the air channel 221 may be actively changed to further adjust the liquid level of the liquid to be tested in the detection cylinder 1 .

[0086] In some embodiments, as shown in FIG5 , the fluid property detection device further includes a righting structure 5 , which includes:

[0087] The uprighting seat 51 is connected to the top of the detection tube 1, and a receiving cavity 511 connected to an external air source is formed in the uprighting seat 51;

[0088] The mating rod 52 is connected to the end of the rotating rod 31 that passes through the detection tube 1. The mating rod 52 is provided with a plurality of air inlet holes 521 located in the accommodating cavity 511. The plurality of air inlet holes 521 are connected to the hollow channel 311.

[0089] The float 53 has a plurality of float blocks 531 arranged at intervals along the circumferential direction of the matching rod 52 .

[0090] The fluid property detection device provided in the embodiment of the present disclosure, by providing a straightening seat 51, a matching rod body 52, and a float 53, allows the rotating rod 31 to be suspended to a certain extent in the straightening seat 51 under the action of the float 53, thereby reducing the friction force on the rotating rod 31 during the rotation measurement process, and avoiding the data error caused by the friction force when measuring the viscosity of the liquid to be tested. At the same time, the gas enters the air channel 221 inside the rotating rod 31 through the straightening seat 51, so that the gas can not only be used to smooth the liquid level fluctuations and reduce the friction force of the rotating rod 31, but also generate positive pressure in the straightening seat 51, which is used to prevent external impurities from entering the detection cylinder 1 through the matching gap between the rotating rod 31 and the detection cylinder 1, and affecting the measurement results of the liquid to be tested.

[0091] As an example, the straightening seat 51 is arranged on the upper side surface of the top of the detection cylinder 1, and the straightening seat 51 is a cylindrical structure with an accommodating cavity 511. In other embodiments, the straightening seat 51 can also be a cubic structure with an accommodating cavity 511. There is no restriction on the specific structure of the straightening seat 51; the end of the rotating rod 31 that passes through the detection cylinder 1 is provided with a matching rod body 52. ​​The matching rod body 52 in this embodiment is also a circular tubular structure. The matching rod body 52 is arranged along the axial direction of the rotating rod 31 and connected to one end of the rotating rod 31. The matching rod body 52 is located in the accommodating cavity 511 of the straightening seat 51, and the cavity in the matching rod body 52 is connected to the hollow channel 311 of the rotating rod 31. A plurality of air inlet holes 521 are opened on the side wall of the matching rod body 52, and the hollow channel 311 is connected to the accommodating cavity 511 through the plurality of air inlet holes 521. The plurality of air inlet holes 521 are arranged at intervals along the circumference of the matching rod body 52. The sidewall is provided to ensure uniform air intake into the hollow channel 311. In this embodiment, the float 53 is made of a lightweight material and is arranged axially along the mating rod 52. The upper end area of ​​the float 53 is smaller than the lower end area of ​​the float 53, so that the float 53 can be suspended under the action of pressurized gas. Multiple floats 53 are spaced apart along the circumference of the mating rod 52 on the sidewall to prevent the mating rod 52 from tilting due to gravity imbalance during suspension. In this embodiment, when no gas is injected into the accommodation space, the mating rod 52 and the float 53 are both in contact with the upper side surface of the top of the detection tube 1 due to gravity. When positive pressure gas is injected into the accommodation space from an external gas source, the upper and lower ends of the float 53 are suspended within the accommodation cavity 511 due to the thrust difference caused by the gas pressure, thereby causing the mating rod 52 to be suspended within the accommodation cavity 511. In other embodiments, the shape of the float 53 is not specifically limited.

[0092] In some embodiments, as shown in FIG. 6 to FIG. 8 , the fluid property detection device further includes a damping structure 6 , which is configured to reduce the rotation speed of the mating rod 52 .

[0093] The fluid property detection device provided in the embodiment of the present disclosure can quickly reduce the rotation speed of the matching rod body 52 by providing the damping structure 6, so that the matching rod body 52 drives the rotating rod 31 to quickly reduce the speed, so as to achieve the purpose of quickly stopping the rotation of the rotating rod 31, thereby eliminating the rotation state of the liquid to be tested in the detection cylinder 1, and achieving the liquid to be tested can quickly return to a state of rest and measure the density of the liquid to be tested after the viscosity measurement process; avoid the time taken for the liquid to be tested to return to a state of rest too long, resulting in a reduction in the number of measurements per unit time and resulting in too low efficiency of online density measurement; further, when the detachable pipeline 212 is disconnected, the time taken for the liquid to be tested to return to a state of rest too long will also cause the liquid to be tested in the detection cylinder 1 to denature, resulting in invalid measurement data of the liquid to be tested.

[0094] The damping structure 6 of this embodiment is arranged in the accommodating cavity 511 of the straightening seat 51. In other embodiments, the damping structure 6 can also be arranged outside the straightening seat 51 or inside the detection tube 1, and there is no specific limitation on this. In this embodiment, the damping structure 6 includes a starting device that can turn on or off the damping, and an action device that can be connected to the mating rod body 52. ​​When the starting device is in the on state, the action device provides a force to the mating rod body 52 in the opposite direction of rotation of the mating rod body 52, or the action device and the mating rod body 52 abut against friction to quickly reduce the rotation state of the mating rod body 52.

[0095] In some embodiments, as shown in FIG6 , the damping structure 6 includes an electromagnetic coil 61 connected to the inner peripheral wall of the righting seat 51 , and the float 53 is made of a conductive material.

[0096] The fluid performance detection device provided by the embodiment of the present disclosure uses an electromagnetic coil 61 and a conductive material so that when the electromagnetic coil 61 is energized, the float 53 rotates and cuts the magnetic lines of force within the range of the induced magnetic field generated by the electromagnetic coil 61, and eddy currents are generated inside the float 53. The eddy currents inside the float 53 generate another induced magnetic field and generate an interaction force with the induced magnetic field generated by the electromagnetic coil 61. The direction of the force provided by the float 53 to the mating rod 52 is opposite to the rotation direction of the mating rod 52. Under the action of the float 53, the mating rod 52 can quickly reduce the rotation speed to achieve the purpose of stopping rotation.

[0097] As an example, the electromagnetic coil 61 is wound along the circumference of the cooperating rod body 52 and is arranged on the inner circumferential wall of the straightening seat 51. In other embodiments, the straightening seat 51 can also be a double-layer cylindrical structure with inner and outer sleeves. The straightening seat 51 includes an inner seat 513 and an outer seat 512 sleeved on the outside of the inner seat 513. The accommodating cavity 511 is located inside the inner seat 513, and the electromagnetic coil 61 is arranged on the inner wall of the inner seat 513; in other embodiments, there is no specific restriction on the specific setting position of the electromagnetic coil 61, and it is required to cooperate with the float 53 to generate a force opposite to the rotation direction of the rotating rod 31.

[0098] In some embodiments, as shown in Figures 7, 8 and 13, the damping structure 6 includes at least one damping elastic membrane 62 connected to the inner wall of the straightening seat 51, and a gas chamber 514 is formed in the peripheral side wall of the straightening seat 51. When gas is injected into the gas chamber 514, the at least one damping elastic membrane 62 can expand toward the accommodating cavity 511 to abut the float 53.

[0099] The fluid performance detection device provided in the embodiment of the present disclosure can squeeze the float 53 through the damping elastic membrane 62 and the gas chamber 514 to provide friction and resistance to the mating rod 52, thereby achieving the purpose of quickly reducing the rotation speed of the rotating rod 31 and also achieving the purpose of quickly stopping the rotation of the mating rod 52.

[0100] Specifically, the gas chamber 514 is arranged on the peripheral side wall of the straightening seat 51, and the gas chamber 514 is connected to the second external gas source for dynamically adjusting the gas pressure in the gas chamber 514. The damping elastic membrane 62 is arranged on the peripheral side wall of the straightening seat 51, and one side of the damping elastic membrane 62 faces the accommodating cavity 511, and the other side of the damping elastic membrane 62 faces the gas chamber 514. When the gas pressure in the gas chamber 514 increases, the damping elastic membrane 62 protrudes toward the float 53 located in the accommodating cavity 511 and abuts against the float 53.

[0101] In some embodiments, as shown in Figures 7, 8 and 13, the righting seat 51 includes an inner seat 513 and an outer seat 512 sleeved on the outside of the inner seat 513, the outer seat 512 is connected to the top of the detection cylinder 1, and a gas chamber 514 is formed between the inner seat 513 and the outer seat 512, and a steam injection hole 5121 and an exhaust hole 5122 are opened on the outer seat 512; there are multiple damping elastic membranes 62, and the multiple damping elastic membranes 62 are connected to the inner seat 513 at intervals along the circumferential direction of the gas chamber 514.

[0102] The fluid performance detection device provided by the embodiment of the present disclosure provides a fluid performance detection device by configuring the straightening seat 51 as an inner seat 513 and an outer seat 512 which are arranged inside and outside, so as to provide a plurality of damping elastic membranes 62 with multi-directional equal air pressure to achieve equal deformation; by configuring the steam injection hole 5121 and the exhaust hole 5122, the air pressure in the gas chamber 514 can be dynamically adjusted according to demand, that is, the degree of protrusion of the damping elastic membrane 62 can be adjusted, thereby achieving dynamic adjustment of the squeezing force of the damping elastic membrane 62 on the float 53 according to the rotation speed. The plurality of damping elastic membranes 62 are arranged at intervals, which can also avoid the problem of a single damping elastic membrane 62 protruding in one direction and abutting against the floating block 531, causing the rotation rod 31 to be offset.

[0103] Specifically, the inner seat 513 and the outer seat 512 in this embodiment are generally cylindrical structures, the outer diameter of the inner seat 513 is smaller than the inner diameter of the outer seat 512, and the gap between the inner seat 513 and the outer seat 512 forms a closed gas chamber 514. The side wall of the outer seat 512 is provided with a steam injection hole 5121 and an exhaust hole 5122. The gas chamber 514 is connected to the second external gas source through the steam injection hole 5121 and the exhaust hole 5122. A damping elastic membrane 62 is provided on the side wall of the inner seat 513, and one side of the damping elastic membrane 62 faces the accommodating cavity 511 and is arranged toward the floating block 531, and the other side of the damping elastic membrane 62 faces the gas chamber 514. When the air pressure in the gas chamber 514 increases, the multiple damping elastic membranes 62 protrude toward the float 53 located in the accommodating cavity 511 and abut against the float 53. When the air pressure in the gas chamber 514 decreases, the multiple damping elastic membranes 62 retract in the direction away from the float 53. The damping elastic membrane 62 of this embodiment is generally made of rubber material. In other embodiments, the material of the damping elastic membrane 62 can also be other elastic materials, and there is no specific limitation on this.

[0104] In some embodiments, as shown in FIG9 , the fluid property detection device further includes a second rotating cylinder 7 rotatably disposed in the detection cylinder 1 , the second rotating cylinder 7 being sleeved on the outside of the first rotating cylinder 32 , and a plurality of flow holes 71 being provided on the second rotating cylinder 7 located on the surface of the liquid to be tested in the detection cylinder 1 .

[0105] The fluid property detection device provided in the embodiment of the present disclosure can measure the liquid to be tested in the detection cylinder 1 using the stator-rotor viscosity measurement method by providing the second rotating cylinder 7, thereby providing a new viscosity detection method.

[0106] Specifically, in this embodiment, the second rotating drum 7 is rotatably connected to the top of the detection drum 1, the second rotating drum 7 is disposed in the inner cavity of the detection drum 1, and the drive motor 72 of the second rotating drum 7 is connected to the top of the detection drum 1. The drive motor 72 is disposed on the outside of the top of the detection drum 1, and the second rotating drum 7 is connected to the drive motor 72 via a drive bearing. The inner diameter of the second rotating drum 7 in this embodiment is larger than the outer diameter of the first rotating drum 32, so that a measuring gap exists between the first rotating drum 32 and the second rotating drum 7. The measuring gap is used to accommodate the liquid to be measured and facilitate the measurement of the viscosity of the liquid to be measured. In this embodiment, the lower end of the second rotating drum 7 is open and the lower end of the second rotating drum 7 is located below the liquid level of the liquid to be measured to facilitate the liquid to be measured to enter the measuring gap. In other embodiments, the lower end of the second rotating drum 7 is sealed, and an opening is opened on the side wall of the second rotating drum 7 below the liquid level of the liquid to be measured to facilitate the liquid to be measured to enter the measuring gap. In other embodiments, the structure for the liquid to be measured to enter the measuring gap between the first rotating drum 32 and the second rotating drum 7 is not specifically limited. The second rotating drum 7 of this embodiment is provided with a plurality of flow holes 71 on its side wall located above the liquid level of the liquid to be measured, so as to facilitate the free flow of gas above the liquid level to be measured into the measuring gap, balance the air pressure in various parts of the detection drum 1, and avoid problems such as measurement errors caused by the different air pressures inside and outside the second rotating drum 7, which may cause the liquid in the measuring gap to be subjected to excessive air pressure.

[0107] In other embodiments, the stop plate 26 is connected to the rotating rod 31, and the outer diameter of the stop plate 26 is smaller than the inner diameter of the second rotating cylinder 7 to avoid excessive gas pressure below the stop plate 26; the flow hole 71 is set at a height in the second rotating cylinder 7 higher than the height of the stop plate 26, and the gas output from the outlet of the air channel 221 can flow from the gap between the stop plate 26 and the second rotating cylinder 7, and then pass through the flow hole 71 to communicate with other spaces in the inner cavity of the detection cylinder 1; in a specific embodiment, the distance between the flow hole 71 and the top of the second rotating cylinder 7 is 1 / 3 of the overall height of the second rotating cylinder 7. In another specific embodiment, the diameter of the flow hole 71 is 0.5 mm to 1.5 mm, which avoids the problem that the air pressure below the stop plate 26 in the measuring gap is too low due to the opening being too large, and the liquid level fluctuation cannot be suppressed, thereby affecting the measurement accuracy; it also avoids the problem that the air pressure below the stop plate 26 in the measuring gap is too high due to the opening being too small, thereby affecting the measurement accuracy.

[0108] The stator-rotor viscosity measurement method of this embodiment mainly includes: the second rotating drum 7 rotates at a preset speed and drives the liquid to be measured in the measuring gap to rotate. When the liquid to be measured tends to be stable, the first rotating drum 32 rotates driven by the liquid to be measured.

[0109] In a specific embodiment, the viscosity of the liquid to be measured is obtained by measuring the rotational torque of the rotating rod 31;

[0110] In another specific embodiment, the rotating rod 31 rotates, and the viscosity of the liquid to be measured is obtained by measuring parameters such as the stable rotation speed of the rotating rod 31 and the time taken to reach the stable rotation speed. The specific formula of the method is as follows:

[0111] Wherein, η is the apparent viscosity of the liquid to be measured at the stable rotation speed; R i is the outer diameter of the first drum 32, mm; R a is the inner diameter of the second drum 7, mm; L is the height of the first drum 32, mm; ω out is the preset speed of the second drum 7, rad / s; J is the moment of inertia of the first drum 32, kg·m 2 ;ω const is the stable rotation speed of the first rotating drum 32, rad / s; t is the time taken for the first rotating drum 32 to reach the stable rotation speed, s.

[0112] In other embodiments, other measurement methods may be used for calculation, which is not specifically limited.

[0113] In some embodiments, as shown in Figure 10, the fluid performance detection device also includes a protective cover 54, which is arranged on the outside of the straightening structure 5. A speed meter 55 is provided inside the protective cover 54, and the speed meter 55 is arranged opposite to the end of the matching rod 52 extending out of the straightening structure 5.

[0114] The fluid property detection device provided in the embodiment of the present disclosure prevents external impurities from directly invading the righting structure 5 by providing a protective cover 54. The rotation speed of the first rotating drum 32 can be directly read by the speed meter 55, which is convenient for directly obtaining the angular speed of the first rotating drum 32 when measuring the viscosity of the liquid to be tested using the stator-rotor viscometry method.

[0115] Specifically, the protective cover 54 is generally a cylindrical structure, and the protective cover 54 is arranged on the outside of the straightening seat 51. The lower end of the protective cover 54 is sealed and connected to the top of the detection tube 1; in one specific embodiment, the accommodating chamber 511 is connected to the external gas source through the first gas rod 56, and the first gas rod 56 is passed through the protective cover 54, and one end of the first gas rod 56 is connected to the straightening seat 51; in another specific embodiment, the steam injection hole 5121 is connected to the second gas rod 57, and the second gas rod 57 is passed through the protective cover 54, and the gas chamber 514 is steam injected through the second gas rod 57; the exhaust hole 5122 is connected to the third gas rod 58, and the third gas rod 58 is passed through the protective cover 54, and the gas chamber 514 is exhausted through the third gas rod 58.

[0116] In this embodiment, the speedometer 55 is connected to the top inner wall of the protective cover 54. The speedometer 55 is arranged relative to the end of the mating rod 52 extending out of the straightening structure 5 to measure the angular velocity of the mating rod 52, and then convert it into the rotational speed of the first rotating drum 32. In other embodiments, the speedometer 55 can also be arranged relative to the end of the mating rod 52. The speedometer 55 in this embodiment is a magnetoelectric speed sensor. In other embodiments, the speedometer 55 can also be a magnetic speed sensor, a Hall sensor, a photoelectric speed sensor or a speed gyroscope, etc., and there is no specific limitation on this.

[0117] In some embodiments, as shown in Figures 11 and 12, a baffle tube 8 and at least one baffle plate 81 connected to the inner wall of the baffle tube 8 are provided in the detection tube 1. The baffle plate 81 has a first position in contact with the baffle tube 8 and a second position at a certain angle α to the baffle tube 8.

[0118] The fluid performance detection device provided in the embodiment of the present disclosure is provided with a baffle 81 to quickly block the flow of liquid after the viscosity test is performed in the detection tube 1, so that the liquid returns to a static state, thereby avoiding problems such as denaturation of the liquid to be tested due to the liquid stopping rotating for too long.

[0119] Specifically, the baffle tube 8 is generally a circular tubular structure. The shape of the baffle tube 8 is set to fit the inner wall of the detection tube 1. The upper and lower ends of the baffle tube 8 are open. The inner wall of the baffle tube 8 is cylindrical. The baffle plate 81 is generally an arc-shaped plate structure. The baffle plate 81 is hingedly connected to the inner wall of the baffle tube 8 at intervals along the circumference of the baffle tube 8, that is, one end of the baffle plate 81 is hingedly connected to the inner wall of the baffle tube 8, and the other end of the baffle plate 81 is freely set. When the baffle 81 is in contact with the inner wall of the baffle tube 8, the baffle 81 is in a first position, and the curvature of the baffle 81 is the same as the curvature of the baffle tube 8 to which it is in contact, so as to avoid the baffle 81 protruding relative to the inner wall of the baffle tube 8, which would cause an error in the viscosity measurement; when the baffle 81 is set at a certain angle α to the inner wall of the baffle tube 8, the baffle 81 is in a second position, and at this time the baffle 81 is set at a certain angle to the direction of liquid flow to prevent the flow of liquid.

[0120] In some embodiments, as shown in Figures 11 and 12, the angle α is 55° to 65°. In this embodiment, the angle α is the angle between the baffle plate 81 and the inner wall of the baffle tube 8. Experimental results show that when preventing liquid flow, the angle α between the baffle plate 81 and the baffle tube 8 is between 55° and 65°, which can effectively prevent the flow of liquid around the rotating rod 31 and quickly stop the flow of water.

[0121] In some embodiments, as shown in Figures 11 and 12, a steam injection ring cavity 82 is formed between the choke tube 8 and the detection tube 1, the choke tube 8 has a plurality of choke holes 83 arranged at intervals along its circumferential direction, and each choke hole 83 is sealed and connected to a choke elastic membrane 84, and the choke plate 81 is connected to the choke elastic membrane 84.

[0122] The fluid performance detection device provided in the embodiment of the present disclosure is configured with a flow-blocking hole 83 and a flow-blocking elastic membrane 84. The flow-blocking elastic membrane 84 protrudes into the detection cylinder 1 to push the flow-blocking plate 81 from the first position to the second position, thereby realizing automatic control of the flow-blocking plate 81 to rise simultaneously.

[0123] Specifically, the gap between the blocking tube 8 and the detection tube 1 forms a steam injection ring cavity 82, and the steam injection ring cavity 82 controls the gas pressure in the steam injection ring cavity 82 through an external air pressure system. A plurality of blocking holes 83 are arranged on the inner wall of the blocking tube 8, and a blocking elastic membrane 84 is sealed in each blocking hole 83. One side of the blocking elastic membrane 84 faces the inner cavity of the detection tube 1, and the other side of the blocking elastic membrane 84 faces the steam injection ring cavity 82. The side of the blocking elastic membrane 84 facing the inner cavity of the detection tube 1 is connected to the blocking plate 81; when the gas pressure in the steam injection ring cavity 82 increases, the blocking elastic membrane 84 protrudes toward the direction of the blocking plate 81, and the blocking plate 81 can move from the first position to the second position; when the gas pressure in the steam injection ring cavity 82 decreases, the blocking elastic membrane 84 contracts in the direction away from the blocking plate 81, and the blocking plate 81 can move from the second position back to the first position.

[0124] In some embodiments, as shown in FIG11 and FIG12 , when the detection cylinder 1 is filled with the liquid to be tested, the depth of the flow blocking cylinder 8 immersed in the liquid to be tested is greater than the depth of the second rotating cylinder 7 immersed in the liquid to be tested.

[0125] The choke tube 8 provided in the embodiment of the present disclosure improves the flow choke coverage of the choke tube 8 by setting the depth of the choke tube 8 immersed in the liquid to be tested to correspond to the depth of the second rotating tube 7 immersed in the liquid to be tested. Specifically, the depth of the choke tube 8 immersed in the liquid to be tested is the distance from the bottom of the choke tube 8 to the liquid surface of the liquid to be tested in the detection tube 1, and the depth of the second rotating tube 7 immersed in the liquid to be tested is the distance from the bottom of the second rotating tube 7 to the liquid surface of the liquid to be tested in the detection tube 1.

[0126] In some embodiments, as shown in FIG. 11 and FIG. 12 , the depth of the blocking cylinder 8 immersed in the liquid to be tested is 1.5 to 2.2 times the depth of the second rotating cylinder 7 immersed in the liquid to be tested.

[0127] The flow-blocking cylinder 8 provided in the disclosed embodiments achieves optimal flow-blocking performance by further limiting the corresponding depth of immersion in the test liquid and the depth of immersion of the second rotating cylinder 7 in the test liquid. Specifically, the distance between the bottom of the flow-blocking cylinder 8 and the surface of the test liquid in the detection cylinder 1 is 1.5 to 2.2 times the distance between the bottom of the second rotating cylinder 7 and the surface of the test liquid in the detection cylinder 1.

[0128] In some embodiments, as shown in Figures 3 to 10, when the liquid to be tested is injected into the detection cylinder 1, when the liquid level of the liquid to be tested is lower than the minimum liquid level, the amount of gas injected into the detection cylinder 1 through the air channel 221 is reduced; when the liquid level of the liquid to be tested is higher than the maximum liquid level, the amount of gas injected into the detection cylinder 1 through the air channel 221 is increased.

[0129] By limiting the operation mode of the air channel 221, the purpose of controlling the liquid level of the liquid to be tested in the detection cylinder 1 is achieved. By controlling the liquid level, the purpose of controlling the immersion depth of the flow blocking cylinder 8 in the liquid to be tested, and / or the immersion depth of the second rotating cylinder 7 in the liquid to be tested, and / or the immersion depth of the first rotating cylinder 32 in the liquid to be tested is also achieved.

[0130] Specifically, in one embodiment, a certain amount of positive pressure gas is injected into the detection cylinder 1 through the gas passage 221. Under the action of the positive pressure gas, the liquid level of the test liquid is balanced at a stable height. If the stable height is lower than the minimum liquid level, the amount of gas injected into the detection cylinder 1 by the gas passage 221 is reduced. The liquid level of the test liquid is then balanced at a first stable height under the action of the positive pressure of the new gas amount, which is higher than the stable height. If the stable height is higher than the maximum liquid level, the amount of gas injected into the detection cylinder 1 by the gas passage 221 is increased. The liquid level of the test liquid is then balanced at a second stable height under the action of the positive pressure of the new gas amount, which is lower than the stable height. In this embodiment, the minimum liquid level is the liquid level when the first rotating drum 32 is three times the height of the first rotating drum 32 below the liquid level of the test liquid, as described in the above embodiment. The maximum liquid level is the liquid level when the first rotating drum 32 is five times the height of the first rotating drum 32 below the liquid level of the test liquid, as described in the above embodiment. In other embodiments, the liquid level may be set according to the required liquid level that can be imagined by those skilled in the art.

[0131] In some embodiments, as shown in Figures 3 to 10, the fluid inlet 11 and the fluid outlet 12 are both located at the bottom of the test tube 1, with the fluid inlet 11 at a lower level than the fluid outlet 12. By arranging the fluid inlet 11 and the fluid outlet 12 at different heights, the liquid level of the test liquid in the test tube 1 is always higher than the fluid inlet 11, preventing gas from entering the fluid inlet 11 during liquid inflow, which could affect gas detection accuracy. In this embodiment, the fluid inlet 11 and the fluid outlet 12 are both located below the liquid level of the test liquid in the test tube 1, preventing gas above the liquid level of the test liquid in the test tube 1 from leaking out of the fluid outlet 12, which could result in failure to control the gas pressure in the test tube 1.

[0132] In some embodiments, as shown in Figures 3 to 10, a sludge trough 13 is provided at the bottom of the test cylinder 1. By providing the sludge trough 13, impurities carried by the test liquid from the wellbore pipeline can be centrifugally deposited in the sludge trough 13 under the action of the rotation of the first rotating cylinder 32, thereby preventing the impurities from causing erroneous data in the viscosity measurement results of the test liquid.

[0133] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present disclosure. It should be understood that the above description is only a specific embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present disclosure should be included in the scope of protection of the present disclosure.

Claims

1. An on-line detection method for fluid properties, wherein, The method includes a density measurement method: A detection cylinder is arranged on the output path of the liquid to be measured, so that the liquid to be measured continuously flows through the detection cylinder; Positive pressure gas is introduced above the liquid to be measured in the detection cylinder to suppress the fluctuation of the liquid level height; Obtain the volume and mass of the liquid to be measured in the detection cylinder; Calculate the density of the liquid to be measured according to the volume and the mass.

2. The on-line detection method for fluid performance according to claim 1, wherein, The method includes: Obtain the liquid level height value of the liquid to be measured in the detection cylinder; Obtain the volume of the liquid to be measured in the detection cylinder according to the liquid level height value and the cross-sectional area of the detection cylinder.

3. The on-line detection method for fluid performance according to claim 1 or 2, wherein The method includes: Obtain the first mass when there is no liquid to be measured in the detection cylinder; When the liquid to be measured continuously flows through the detection cylinder and the liquid level height is stable, obtain the second mass of the detection cylinder; Obtain the mass of the drilling fluid to be measured in the detection cylinder according to the difference between the first mass and the second mass.

4. The on-line detection method for fluid performance according to any one of claims 1-3, wherein, The method includes: Adjust the pressure of the positive pressure gas so that the liquid level height is maintained within a set range.

5. The on-line detection method for fluid performance according to any one of claims 1-4, wherein, Before the liquid to be measured enters the detection cylinder, perform defoaming treatment on the liquid to be measured.

6. The on-line detection method of fluid performance according to claim 5, wherein, Before the liquid to be measured enters the detection cylinder, first make the liquid to be measured flow through a defoaming tank to remove the gas carried in the liquid to be measured.

7. The on-line detection method for fluid performance according to any one of claims 1-6, wherein, The method further includes a first viscosity measurement method: A rotating rod is arranged in the detection cylinder, a first rotating cylinder is arranged at one end of the rotating rod, the other end of the rotating rod passes through the detection cylinder, and an annular space is formed between the outer wall of the first rotating cylinder and the inner wall of the detection cylinder, so that the liquid to be measured flows into the annular space; wherein, the first rotating cylinder is immersed in the liquid to be measured, and the distance between the bottom surface of the first rotating cylinder and the liquid level of the liquid to be measured is 3-5 times the height of the first rotating cylinder itself; Apply power to the other end of the rotating rod to make the first rotating cylinder rotate at an initial preset speed, drive the liquid to be measured to rotate through the first rotating cylinder, and after the rotation state of the liquid to be measured is stable, cancel the power applied to the rotating rod, and obtain the viscous resistance of the liquid to be measured to the detection cylinder according to the attenuation speed of the rotation speed of the first rotating cylinder, and further obtain the viscosity of the liquid to be measured.

8. The on-line detection method for fluid performance according to claim 1, wherein, The method further includes a second viscosity measurement method: A rotating rod is arranged in the detection cylinder, and a first rotating cylinder is arranged at one end of the rotating rod; A second rotating cylinder is sleeved outside the first rotating cylinder, the second rotating cylinder is rotatably connected to the detection cylinder, and an annular space is formed between the inner wall of the second rotating cylinder and the outer wall of the first rotating cylinder, so that the liquid to be measured flows into the annular space; Make the second rotating cylinder rotate at a preset speed to drive the first rotating cylinder to rotate through the liquid to be measured in the annular space, and after the rotation speed of the first rotating cylinder tends to be stable, obtain the viscosity of the liquid to be measured.

9. The on-line detection method of fluid performance according to claim 8, wherein, The method for obtaining the viscosity of the liquid to be measured includes: Obtain the viscosity of the liquid to be measured by measuring the rotation torque of the rotating rod; or Obtain the viscosity of the liquid to be measured by measuring the stable rotation speed of the rotating rod and the time taken to reach the stable rotation speed.

10. A fluid property detection device for performing the method according to any one of claims 1-9, wherein, The detection device includes: A detection cylinder, having a fluid inlet and a fluid outlet; The liquid stabilizing mechanism comprises a front liquid delivery structure and a gas delivery structure, wherein the front liquid delivery structure comprises a defoaming tank and a detachable pipeline connected to the defoaming tank, wherein the detachable pipeline is connected to the fluid inlet; and the gas delivery structure comprises an airway capable of injecting gas into the detection cylinder; The measuring mechanism comprises a mass detector connected to the bottom of the detection cylinder and a liquid level detector connected inside the detection cylinder.

11. The fluid property detection device according to claim 10, wherein, The detachable pipeline includes a first pipeline and a second pipeline connected to each other, the first pipeline is connected to the defoaming tank, the second pipeline is connected to the fluid inlet, and a detachable structure is connected between the first pipeline and the second pipeline, and the detachable structure has a sealing convex ring and a sealing groove that can be clamped with each other.

12. The fluid property detection device according to claim 11, wherein, The sealing convex ring is connected to the inner wall of the first pipeline, and the sealing groove is connected to the inner wall of the second pipeline; or, the sealing convex ring is connected to the inner wall of the second pipeline, and the sealing groove is connected to the inner wall of the first pipeline.

13. The fluid property detection device according to any one of claims 10-12, wherein, The defoaming tank includes a liquid chamber and an air chamber which are isolated from each other, and the air chamber is configured to apply pressure to the liquid chamber to change the volume of the liquid chamber.

14. The fluid property detection device according to claim 13, wherein, A defoaming elastic membrane is connected inside the defoaming tank, and the liquid cavity and the air cavity are isolated from each other by the defoaming elastic membrane.

15. The fluid property detection device according to claim 14, wherein, The defoaming tank has a gas inlet, a liquid inlet and a liquid outlet, the gas inlet is connected to the gas cavity, the liquid inlet and the liquid outlet are respectively connected to the liquid cavity, and the detachable pipeline is connected to the liquid outlet.

16. The fluid property detection device according to claim 11 or 12, wherein, The first pipeline is connected with a bypass pipeline, and a three-way valve is connected between the bypass pipeline and the first pipeline. The three-way valve can return the liquid flowing through the first pipeline to the wellbore pipeline through the bypass pipeline.

17. The fluid property detection device according to any one of claims 10-16, wherein, The detection cylinder can contain the liquid to be tested, and the outlet of the air channel is arranged close to the liquid surface of the liquid to be tested.

18. The fluid property detection device according to claim 17, wherein, A stop plate is arranged above the outlet of the air passage, and the outer diameter of the stop plate is smaller than the inner diameter of the detection cylinder.

19. The fluid property detection device according to any one of claims 10-18, wherein, The fluid performance detection device also includes a first rotating structure, which has a rotating rod and a first rotating cylinder connected to the rotating rod, and the first rotating cylinder extends into the detection cylinder; a hollow channel is formed in the rotating rod, and the hollow channel forms the air channel. A plurality of air holes connected to the hollow channel are opened on the outer wall of the rotating rod, and the plurality of air holes form the outlet of the air channel.

20. The fluid property detection device according to any one of claims 10-19, wherein, An air inlet pipe is inserted into the detection cylinder, the inner channel of the air inlet pipe forms the airway, the outlet of the air inlet pipe forms the outlet of the airway, or a plurality of air holes are opened on the outer wall of the air inlet pipe, and the plurality of air holes form the outlet of the airway.

21. The fluid property detection device according to claim 19, wherein, The fluid performance detection device further includes a righting structure, and the righting structure includes: A straightening seat connected to the top of the detection tube, wherein a receiving cavity connected to an external air source is formed in the straightening seat; A matching rod body connected to one end of the rotating rod passing through the detection barrel, the matching rod body is provided with a plurality of air inlet holes located in the accommodating cavity, and the plurality of air inlet holes are connected to the hollow channel; The floating body has a plurality of floating blocks arranged at intervals in the circumferential direction of the mating rod body.

22. The fluid property detection device according to claim 21, wherein, The fluid performance detection device further includes a damping structure configured to reduce the rotational speed of the mating rod body.

23. The fluid property detection device according to claim 22, wherein, The damping structure includes an electromagnetic coil connected to the inner peripheral wall of the centralizing seat, and the floating body is made of a conductive material.

24. The fluid performance detection device according to claim 22 or 23, wherein, The damping structure includes at least one damping elastic membrane connected to the inner wall of the centralizing seat. A gas chamber is formed inside the circumferential side wall of the centralizing seat. In a state where gas is injected into the gas chamber, at least one of the damping elastic membranes can expand toward the accommodation chamber to abut against the floating body.

25. The fluid property detection device according to claim 24, wherein, The centralizing seat includes an inner seat and an outer seat sleeved outside the inner seat. The outer seat is connected to the top of the detection cylinder. A gas chamber is formed between the inner seat and the outer seat. An air injection hole and an exhaust hole are formed in the outer seat; there are a plurality of the damping elastic membranes, and the plurality of damping elastic membranes are connected to the inner seat at intervals in the circumferential direction of the gas chamber.

26. The fluid property detection device according to claim 19, wherein, The fluid performance detection device further includes a second rotating cylinder rotatably arranged in the detection cylinder. The second rotating cylinder is sleeved outside the first rotating cylinder, and a plurality of flow holes are formed in the second rotating cylinder located on the liquid surface of the liquid to be measured in the detection cylinder.

27. The fluid property detection device according to claim 21, wherein, The fluid performance detection device further includes a protective cover covering the outside of the centralizing structure. A tachometer is arranged inside the protective cover, and the tachometer is oppositely arranged with respect to the end of the mating rod body extending out of the centralizing structure.

28. The fluid property detection device according to claim 26, wherein, A flow blocking cylinder and at least one flow blocking plate connected to the inner wall of the flow blocking cylinder are arranged in the detection cylinder. The flow blocking plate has a first position where it fits with the flow blocking cylinder and a second position where it is arranged at an angle with the flow blocking cylinder.

29. The fluid property detection device according to claim 28, wherein, An air injection ring cavity is formed between the flow blocking cylinder and the detection cylinder. The flow blocking cylinder has a plurality of flow blocking holes arranged at intervals in its circumferential direction. A flow blocking elastic membrane is hermetically connected to each flow blocking hole, and the flow blocking plate is connected to the flow blocking elastic membrane.

30. The fluid property detection device according to claim 29, wherein, In a state where the liquid to be measured is injected into the detection cylinder, the depth of immersion of the flow blocking cylinder in the liquid to be measured is greater than the depth of immersion of the second rotating cylinder in the liquid to be measured.

31. The fluid property detection device according to claim 30, wherein, The depth of immersion of the flow blocking cylinder in the liquid to be measured is 1.5 to 2.2 times the depth of immersion of the second rotating cylinder in the liquid to be measured.

32. The fluid performance detection device according to claim 28, wherein, The included angle is 55° to 65°.

33. The fluid property detection device according to claim 19, wherein, In a state where the liquid to be measured is injected into the detection cylinder, when the liquid level of the liquid to be measured is lower than the lowest liquid level height, the amount of gas injected into the detection cylinder through the air passage is reduced; when the liquid level of the liquid to be measured is higher than the highest liquid level height, the amount of gas injected into the detection cylinder through the air passage is increased.

34. The fluid property detection device according to any one of claims 10-33, wherein, Both the fluid inlet and the fluid outlet are located at the bottom of the detection cylinder, and the horizontal height of the fluid inlet is lower than the horizontal height of the fluid outlet.

35. The fluid property detection device according to claim 19, wherein, A slag accumulation groove is arranged at the bottom of the detection cylinder.

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