Device and method for testing viscosity of engineering slurry in situ

Abstract

The invention provides a device and a method for testing viscosity of engineering slurry in situ. Wherein the vertical measuring cylinder is internally provided with a containing cavity, and the bottom is provided with a grid bottom plate for engineering slurry to enter the containing cavity. The electromagnet mechanism is arranged on the top plate of the vertical measuring cylinder. The density of the magnetic ball is larger than that of engineering slurry, the diameter of the magnetic ball is larger than the grid diameter of the grid bottom plate, and the magnetic ball is attracted below the electromagnet mechanism when the electromagnet mechanism is started. The piezoelectric induction mechanism is arranged on the grid bottom plate and located in the falling range of the magnetic ball when the electromagnet mechanism is in the closed state. The electromagnet mechanism controls release of the magnetic ball through power on and power off, operation is easy and convenient, response is rapid, and the clamping stagnation problem of a mechanical structure is avoided; the density of the magnetic ball is larger than that of engineering slurry, and the magnetic ball can smoothly fall in the slurry. The piezoelectric induction mechanism can accurately detect the contact of the magnetic ball, the response is sensitive, no mechanical moving part exists, the possibility of fault occurrence is reduced, the reliability of the device is improved, and the service life of the device is prolonged.

Description

Technical Field

[0001] This invention relates to the field of mud performance testing technology, and in particular to an apparatus and method for in-situ testing of engineering mud viscosity. Background Technology

[0002] Traditional ball-dropping methods rely on high-speed cameras or laser sensors to capture the trajectory of a ball. However, underground engineering mud typically has a high solids content (>20% soil) and heterogeneous characteristics. When the suspended particles in the mud are >50μm in size, Mie scattering occurs in the optical path, causing the transmittance to drop below 15%, making it impossible to accurately identify the ball's position. More seriously, air bubbles in the mud can create false signals, reducing detection efficiency. Existing timed ball-dropping devices often use mechanical baffles to trigger sensors, which have three drawbacks: 1. Structural jamming: Hard particles >75μm in the mud can intrude into mechanical gaps, causing baffle reset failure; 2. Sealing failure: In the corrosive environment of mud, the silicone seal of the mechanical motion shaft seal has a lifespan of less than 3 months; 3. Dynamic interference: The opening and closing of the baffle causes local turbulence, changing the ball's falling speed. Summary of the Invention

[0003] The main objective of this invention is to provide an apparatus and method for in-situ testing of engineering mud viscosity, in order to solve the technical problems of high equipment failure rate, short service life and inaccurate measurement in the traditional falling ball method.

[0004] To achieve the above objectives, the present invention provides an apparatus for in-situ testing of engineering mud viscosity, comprising:

[0005] The vertical measuring cylinder has an internal cavity and a grid bottom plate for the engineering mud to enter the cavity.

[0006] An electromagnet mechanism is installed on the top plate of the vertical measuring cylinder.

[0007] A magnetic sphere, with a density greater than that of engineering mud and a diameter greater than that of the grid base plate, is attracted to the bottom of the electromagnet mechanism when the electromagnet mechanism is activated.

[0008] A piezoelectric sensing mechanism is disposed on the grid base plate and located within the falling range of the magnetic sphere when the electromagnet mechanism is closed.

[0009] According to an embodiment of this application, a control mechanism is also included. The control mechanism is electrically connected to the electromagnet mechanism, controls the electromagnet mechanism to open or close, and records the closing time t1.

[0010] The control mechanism is electrically connected to the piezoelectric sensing mechanism, receives the electrical signal generated by the contact between the piezoelectric sensing mechanism and the magnetic sphere, and records the contact time t2.

[0011] According to an embodiment of this application, the top of the vertical measuring cylinder has an armored cable, and the control mechanism is electrically connected to the electromagnet mechanism and the piezoelectric induction mechanism through the armored cable. The armored cable is strong enough to support the vertical measuring cylinder.

[0012] According to an embodiment of this application, a height detection mechanism is also included. The height detection mechanism is disposed inside the vertical measuring cylinder and located above the electromagnet mechanism. It is used to detect whether the engineering mud fills the vertical measuring cylinder. The height detection mechanism is electrically connected to the vertical measuring cylinder.

[0013] According to an embodiment of this application, the height detection mechanism is a float detection switch. When the engineering mud fills the vertical measuring cylinder, the float detection switch is triggered to open.

[0014] According to an embodiment of this application, the vertical measuring cylinder is provided with an openable and closable flushing opening, which is directly opposite to and located above the electromagnet mechanism and the height detection mechanism.

[0015] According to an embodiment of this application, the magnetic sphere has a diameter of 2-3 cm, is hollow inside, and has a hollow volume of 1 / 2 to 2 / 3 of the sphere volume. The magnetic sphere is made of high-density alloy and is nickel-plated on the surface.

[0016] According to an embodiment of this application, the mesh diameter of the mesh base plate is 1.0cm to 1.5cm.

[0017] This application also provides a method for in-situ testing of engineering mud viscosity, which utilizes the aforementioned apparatus for in-situ testing of engineering mud viscosity, and includes the following steps:

[0018] Activate the electromagnet mechanism and attract the magnetic sphere to the bottom of the electromagnet mechanism.

[0019] The device for in-situ testing of engineering mud viscosity is lowered into the engineering mud at the target depth of the area to be tested.

[0020] After the vertical measuring cylinder is filled with engineering mud, the electromagnet mechanism is turned off, causing the magnetic sphere to release and fall downwards, and the closing time t1 is recorded.

[0021] Record the contact time t2 when the magnetic sphere comes into contact with the piezoelectric induction mechanism.

[0022] The falling velocity of the magnetic sphere is calculated based on the closing time t1, the contact time t2, the vertical distance h1 between the piezoelectric induction mechanism and the electromagnet mechanism, and the diameter r of the magnetic sphere. The viscosity of the engineering mud is then calculated based on the Stokes falling ball method.

[0023] According to embodiments of this application, at least one of the following conditions is also included:

[0024] (1) Control the electromagnet mechanism to open or close through the control mechanism, and record the closing time t1.

[0025] (2) The control mechanism receives the electrical signal generated by the contact between the piezoelectric induction mechanism and the magnetic sphere, and records the contact time t2.

[0026] (3) The falling speed of the magnetic sphere is calculated by the control mechanism, and the viscosity of the engineering mud is calculated based on the Stokes falling ball method.

[0027] In the aforementioned in-situ testing device for engineering mud viscosity, the vertical measuring cylinder provides a stable testing space for the mud and the magnetic sphere, ensuring that the measurement is performed in a relatively stable environment. The electromagnet mechanism controls the release of the magnetic sphere by switching the power on and off, which is simple to operate and responds quickly, avoiding the problem of mechanical jamming. The magnetic sphere has a density greater than that of the engineering mud, allowing it to fall smoothly into the mud. Its diameter is larger than the grid diameter of the grid base plate, preventing the sphere from falling out of the measuring cylinder. The piezoelectric sensing mechanism can accurately detect the contact of the magnetic sphere, has a sensitive response, and has no moving mechanical parts, reducing the possibility of failure and improving the reliability and service life of the device. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of an in-situ testing apparatus for engineering mud viscosity according to one embodiment of this application;

[0030] Figure 2 This is a schematic diagram of the top plate structure of the device for in-situ testing of engineering mud viscosity according to one embodiment of this application;

[0031] Figure 3 This is a schematic diagram of the base plate structure of an in-situ testing apparatus for engineering mud viscosity according to one embodiment of this application.

[0032] The realization of the objective, functional characteristics and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings.

[0033] 1. Vertical measuring cylinder; 2. Magnetic sphere; 3. Top plate; 4. Grid base plate; 5. Electromagnet mechanism; 6. Control mechanism; 7. Power supply; 8. Piezoelectric induction mechanism; 9. Armored cable. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] It should be noted that all directional indicators (such as up, down, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0036] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0037] Furthermore, the technical solutions of the various embodiments of the present invention can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by the present invention.

[0038] This invention provides an apparatus for in-situ testing of engineering mud viscosity, with reference to... Figures 1-3 It includes a vertical measuring cylinder 1, an electromagnet mechanism 5, a magnetic sphere 2, and a piezoelectric induction mechanism 8.

[0039] The vertical measuring cylinder 1 has an internal cavity and a grid bottom plate 4 for the engineering mud to enter the cavity.

[0040] The vertical measuring cylinder 1 is a columnar structure that provides a space for the mud and a channel for the magnetic ball 2 to fall, and its axis is kept vertical to ensure measurement accuracy. Exemplarily, the vertical measuring cylinder 1 is a vertical measuring cylinder. The grid base plate 4 is a plate-like structure with grid-like holes located at the bottom of the vertical measuring cylinder 1, used to allow mud to enter the measuring cylinder while preventing the magnetic ball 2 from falling. The vertical measuring cylinder 1 can be made of stainless steel or rigid plastic.

[0041] An electromagnet mechanism 5 is disposed on the top plate 3 of the vertical measuring cylinder 1. The electromagnet mechanism 5 is a device that generates magnetism by energizing the cylinder, enabling it to attract magnetic objects. The presence or absence of magnetism can be controlled by switching the power on and off. The electromagnet mechanism 5 can be a cross-shaped energized structure, or it can be a DC electromagnet or an AC electromagnet. In some embodiments, a power supply 7 is also provided above the electromagnet mechanism 5 in the vertical measuring cylinder 1 to control the power supply to the electromagnet mechanism 5.

[0042] The magnetic sphere 2 has a density greater than that of the engineering mud and a diameter greater than that of the grid base plate 4. When the electromagnet mechanism 5 is in the open state, it is attracted to the bottom of the electromagnet mechanism 5. The magnetic sphere 2 is a magnetic, spherical object with a density greater than that of the mud being tested. When the electromagnet mechanism 5 is closed, it can fall into the mud under the influence of gravity.

[0043] The piezoelectric sensing mechanism 8 is mounted on the grid base plate 4, located within the drop range of the magnetic sphere 2 when the electromagnet mechanism 5 is closed. The piezoelectric sensing mechanism 8 is a device that converts mechanical energy into electrical energy. When subjected to external force, it generates an electrical signal, which can be used to detect contact between objects. When the magnetic sphere 2 falls onto it, an electrical signal is generated. The piezoelectric sensing mechanism 8 can employ a piezoelectric ceramic sensor or a piezoelectric crystal sensor.

[0044] In the aforementioned in-situ testing device for engineering mud viscosity, the vertical measuring cylinder 1 provides a stable testing space for the mud and the magnetic sphere 2, ensuring that the measurement is performed in a relatively stable environment; the electromagnet mechanism 5 controls the release of the magnetic sphere 2 by switching the power on and off, which is simple to operate and responds quickly, avoiding the problem of mechanical jamming; the magnetic sphere 2 has a density greater than that of the engineering mud, allowing it to fall smoothly in the mud, and its diameter is larger than the grid diameter of the grid base plate 4, preventing the sphere from falling out of the measuring cylinder; the piezoelectric sensing mechanism 8 can accurately detect the contact of the magnetic sphere 2, has a sensitive response, and has no moving mechanical parts, reducing the possibility of failure and improving the reliability and service life of the device.

[0045] In some embodiments, refer to Figures 1-3 It also includes a control mechanism 6. The control mechanism 6 is used to receive and process signals and issue control commands to achieve coordinated control and data recording of various parts of the device. For example, the control mechanism 6 can be a PLC controller, a microcontroller control system, or a computer with corresponding control software installed.

[0046] The control mechanism 6 is electrically connected to the electromagnet mechanism 5, controls the electromagnet mechanism 5 to open or close, and records the closing time t1. The control mechanism 6 is also electrically connected to the piezoelectric sensing mechanism 8, receives the electrical signal generated by the contact between the piezoelectric sensing mechanism 8 and the magnetic sphere 2, and records the contact time t2.

[0047] The control mechanism 6 realizes automatic control of the electromagnet mechanism 5 and accurately records the closing time t1 of the electromagnet; at the same time, it can receive the electrical signal of the piezoelectric sensing mechanism 8 in a timely manner and record the contact time t2, which improves the accuracy and reliability of time recording, provides an accurate data basis for subsequent viscosity calculation, realizes the automated control of the testing process, and reduces human operation error.

[0048] In some embodiments, refer to Figures 1-3 The top of the vertical measuring cylinder 1 has an armored cable 9. The control mechanism 6 is electrically connected to the electromagnet mechanism 5 and the piezoelectric induction mechanism 8 through the armored cable 9. The armored cable 9 is strong enough to support the vertical measuring cylinder 1.

[0049] Armored cables are made of conductors of different materials encased in a metal sheath with insulating material, and are processed into a flexible and sturdy assembly with good mechanical strength and insulation properties.

[0050] The armored cable 9 not only enables electrical connection between the control mechanism 6, the electromagnet mechanism 5, and the piezoelectric induction mechanism 8, ensuring stable transmission of signals and power, but its excellent mechanical strength also allows it to support the weight of the vertical measuring cylinder 1, facilitating the lowering of the device to the depth to be measured. At the same time, the armored structure effectively protects the internal structure of the cable from erosion by external environments such as mud, extending the cable's service life.

[0051] In some embodiments, a height detection mechanism is also included. The height detection mechanism is disposed inside the vertical measuring cylinder 1 and located above the electromagnet mechanism 5. It is used to detect whether the engineering mud fills the vertical measuring cylinder 1. The height detection mechanism is electrically connected to the vertical measuring cylinder 1.

[0052] The height detection mechanism is a device used to detect the height of the mud level inside the vertical measuring cylinder 1 and to determine whether the measuring cylinder is full of mud.

[0053] The height detection mechanism can employ photoelectric level sensors, capacitive level sensors, or float-type level switches. This mechanism accurately detects whether the vertical measuring cylinder 1 is completely filled with engineering mud, ensuring that the magnetic sphere 2 is released only after the cylinder is fully filled. This guarantees consistent measurement conditions, avoids measurement errors caused by incomplete mud filling, and improves test accuracy. Furthermore, its electrical connection to the control mechanism 6 allows for timely transmission of detection signals, enabling automated control of the testing process.

[0054] In some embodiments, the height detection mechanism is a float detection switch, which is triggered to open when the engineering mud fills the vertical measuring cylinder 1.

[0055] A float detection switch is a device that uses the change in buoyancy of a float in a liquid to achieve a switching action. Float detection switches can be made of plastic (PP) or metal (stainless steel).

[0056] The float detection switch has a simple structure, high reliability, and low cost. When the engineering mud fills the vertical measuring cylinder 1, it can accurately trigger the switch to open and send a signal to the control mechanism 6, ensuring that the measurement is carried out under the condition of being filled with mud, thus further guaranteeing the accuracy and stability of the measurement.

[0057] In some embodiments, the vertical measuring cylinder 1 is provided with an openable and closable flushing opening, which is directly opposite to and located above the electromagnet mechanism 5 and the height detection mechanism.

[0058] The flushing opening facilitates flushing of the interior of the vertical measuring cylinder 1 after testing, especially effectively cleaning the electromagnet mechanism 5 and the height detection mechanism, preventing mud residue from affecting their performance and subsequent measurement accuracy, extending the service life of the device, and improving the ease of maintenance.

[0059] In some embodiments, refer to Figures 1-3 The magnetic sphere 2 has a diameter of 2-3 cm, is hollow inside, and has a hollow volume of 1 / 2 to 2 / 3 of the sphere volume. The magnetic sphere 2 is made of high-density alloy and is nickel-plated on the surface.

[0060] The magnetic sphere 2, with a diameter of 2-3 cm, falls at a moderate speed in engineering mud, facilitating accurate timing. Its hollow interior, with a hollow volume of 1 / 2 to 2 / 3 of the sphere's volume, allows for flexible adjustment of its density. This ensures the sphere falls smoothly evenly, exceeding the mud density without causing excessive speed and affecting timing accuracy. The high-density alloy material guarantees the sphere's density requirements, while nickel plating enhances its resistance to mud corrosion and extends its lifespan. For example, the relative density of the magnetic sphere 2 is between 2.5 and 3.0.

[0061] In some embodiments, refer to Figures 1-3 The mesh diameter of the mesh base plate 4 is 1.0cm to 1.5cm.

[0062] The grid diameter is 1.0cm to 1.5cm, which is smaller than the diameter of the magnetic sphere 2 (2 to 3cm). This effectively prevents the magnetic sphere 2 from falling out of the vertical measuring cylinder 1. At the same time, the grid size ensures that the engineering mud can smoothly enter the receiving cavity, ensuring that the measuring cylinder is filled with mud and providing a suitable environment for testing.

[0063] This application also provides a method for in-situ testing of engineering mud viscosity, which utilizes the aforementioned apparatus for in-situ testing of engineering mud viscosity, and includes the following steps:

[0064] S100: Activate the electromagnet mechanism 5 and attract the magnetic sphere 2 to the bottom of the electromagnet mechanism 5.

[0065] S200: The device for testing the viscosity of engineering mud in situ is lowered into the engineering mud at the target depth of the area to be tested.

[0066] For example, a vertical measuring cylinder is lowered to a specified depth via armored cable 9.

[0067] S300: After the vertical measuring cylinder 1 is filled with engineering mud, the electromagnet mechanism 5 is closed, causing the magnetic sphere 2 to release and fall downwards, and the closing time t1 is recorded.

[0068] S400: Record the contact time t2 when the magnetic sphere 2 comes into contact with the piezoelectric sensing mechanism 8.

[0069] For example, the piezoelectric sensing device records the first contact time, i.e., contact moment t2, and the signal is transmitted to the control system.

[0070] S500: Calculate the falling speed of the magnetic sphere 2 based on the closing time t1, the contact time t2, the vertical distance h1 between the piezoelectric induction mechanism 8 and the electromagnet mechanism 5, and the diameter r of the magnetic sphere 2, and calculate the viscosity of the engineering mud based on the Stokes falling ball method.

[0071] When a small ball with a density greater than that of a fluid falls at a constant speed in a viscous fluid under the influence of gravity, the gravitational force, buoyancy, and viscous drag on the ball will reach equilibrium. According to Stokes' theorem, the viscosity of the fluid (viscosity coefficient) can be deduced by measuring the ball's falling speed (falling distance / time). The core relationship of the formula is:

[0072] in:

[0073] η is the fluid viscosity (target measurement value);

[0074] ρs is the density of the small ball, and ρf is the density of the mud.

[0075] g is the acceleration due to gravity;

[0076] r is the radius of the small ball;

[0077] v is the velocity of the ball falling at a constant speed (calculated from the "fall time" measured by the device (i.e., the difference between t2 and t1) and the "fixed falling distance inside the vertical measuring cylinder" (i.e., the difference between the vertical distance h1 and the diameter r of the magnetic ball)).

[0078] The method has a clear operation process and utilizes the coordinated work of various parts of the device to avoid the problems caused by optical recognition and mechanical baffles in traditional methods. By accurately recording the relevant parameters of the falling magnetic ball, the viscosity is calculated based on the Stokes falling ball method, and the results are accurate and reliable. It realizes in-situ testing of engineering mud viscosity without the need to bring mud samples back to the laboratory, which improves testing efficiency and reduces mud performance changes caused by the sampling process.

[0079] In some embodiments, at least one of the following conditions is also included:

[0080] (1) The electromagnet mechanism 5 is opened or closed by the control mechanism 6, and the closing time t1 is recorded.

[0081] (2) The control mechanism 6 receives the electrical signal generated by the contact between the piezoelectric sensing mechanism 8 and the magnetic sphere 2, and records the contact time t2.

[0082] (3) The falling speed of the magnetic ball 2 is calculated by the control mechanism 6, and the viscosity of the engineering mud is calculated based on the Stokes falling ball method.

[0083] The control mechanism 6 enables automatic control and time recording of the electromagnet mechanism 5, improving the accuracy and consistency of operation; the control mechanism 6 receives electrical signals and records the contact time, avoiding errors caused by manual recording; the control mechanism 6 automatically calculates the falling speed and viscosity, improving calculation efficiency and accuracy, and further enhancing the automation and reliability of the entire testing process.

[0084] The above technical solutions of the present invention are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. All equivalent structural transformations made under the technical concept of the present invention using the contents of the present invention specification and drawings, or direct / indirect applications in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A device for in-situ testing of engineering mud viscosity, characterized in that, include: The vertical measuring cylinder has an internal receiving cavity and a grid bottom plate for engineering mud to enter the receiving cavity; An electromagnet mechanism is installed on the top plate of the vertical measuring cylinder; A magnetic sphere, with a density greater than that of engineering mud and a diameter greater than that of the grid base plate, is attracted to the bottom of the electromagnet mechanism when the electromagnet mechanism is activated. A piezoelectric sensing mechanism is disposed on the grid base plate and located within the falling range of the magnetic sphere when the electromagnet mechanism is closed.

2. The apparatus for in-situ testing of engineering mud viscosity according to claim 1, characterized in that, It also includes a control mechanism; the control mechanism is electrically connected to the electromagnet mechanism, controls the electromagnet mechanism to open or close, and records the closing time t1; The control mechanism is electrically connected to the piezoelectric sensing mechanism, receives the electrical signal generated by the contact between the piezoelectric sensing mechanism and the magnetic sphere, and records the contact time t2.

3. The apparatus for in-situ testing of engineering mud viscosity according to claim 2, characterized in that, The top of the vertical measuring cylinder has an armored cable, and the control mechanism is electrically connected to the electromagnet mechanism and the piezoelectric induction mechanism through the armored cable. The armored cable is strong enough to support the vertical measuring cylinder.

4. The apparatus for in-situ testing of engineering mud viscosity according to claim 2, characterized in that, It also includes a height detection mechanism, which is disposed inside the vertical measuring cylinder and located above the electromagnet mechanism. The height detection mechanism is used to detect whether the engineering mud fills the vertical measuring cylinder. The height detection mechanism is electrically connected to the height detection mechanism.

5. The apparatus for in-situ testing of engineering mud viscosity according to claim 4, characterized in that, The height detection mechanism is a float detection switch. When the engineering mud fills the vertical measuring cylinder, the float detection switch is triggered to open.

6. The apparatus for in-situ testing of engineering mud viscosity according to claim 4, characterized in that, The vertical measuring cylinder is provided with an opening that can be opened and closed, and the opening is directly above the electromagnet mechanism and the height detection mechanism.

7. The apparatus for in-situ testing of engineering mud viscosity according to any one of claims 1 to 6, characterized in that, The magnetic sphere has a diameter of 2-3 cm, is hollow inside, and has a hollow volume of 1 / 2 to 2 / 3 of the sphere's volume. The magnetic sphere is made of high-density alloy and has a nickel-plated surface.

8. The apparatus for in-situ testing of engineering mud viscosity according to any one of claims 1 to 6, characterized in that, The mesh diameter of the mesh base plate is 1.0cm to 1.5cm.

9. A method for in-situ testing of engineering mud viscosity, characterized in that, The measurement using the in-situ testing apparatus for engineering mud viscosity according to any one of claims 1 to 8 includes the following steps: Activate the electromagnet mechanism and attract the magnetic sphere to the bottom of the electromagnet mechanism; The device for testing the viscosity of engineering mud in situ is lowered into the engineering mud at the target depth in the area to be tested. After the vertical measuring cylinder is filled with engineering mud, the electromagnet mechanism is turned off, causing the magnetic sphere to release and fall downwards, and the closing time t1 is recorded. Record the contact time t2 between the magnetic sphere and the piezoelectric sensing mechanism; The falling velocity of the magnetic sphere is calculated based on the closing time t1, the contact time t2, the vertical distance h1 between the piezoelectric induction mechanism and the electromagnet mechanism, and the diameter r of the magnetic sphere. The viscosity of the engineering mud is then calculated based on the Stokes falling ball method.

10. The method for in-situ testing of engineering mud viscosity according to claim 9, characterized in that, It also includes at least one of the following conditions: (1) Control the electromagnet mechanism to open or close through the control mechanism, and record the closing time t1; (2) The control mechanism receives the electrical signal generated by the contact between the piezoelectric induction mechanism and the magnetic sphere, and records the contact time t2. (3) The falling speed of the magnetic sphere is calculated by the control mechanism, and the viscosity of the engineering mud is calculated based on the Stokes falling ball method.

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