Non-Newtonian fluid density detection method and device

Abstract

The invention belongs to the technical field of drilling fluid density detection, and particularly relates to a non-Newtonian fluid density detection method and device.The non-Newtonian fluid density detection device comprises a surge tank, a three-way ball valve, an anti-explosion pneumatic ball valve and a measuring pipeline; a liquid inlet pipe is arranged in the shell, the liquid inlet pipe sequentially passes through a first connector and a third connector of the three-way ball valve and the anti-explosion pneumatic ball valve to enter a measuring pipeline, a second connector is used for discharging liquid and air, the three-way ball valve comprises a valve element rotationally installed in the shell, and the first connector is a hollow shaft which is rotationally connected and communicated with the liquid inlet pipe. The central axis of the first connector and the central axis of the third connector are parallel to the Y axis, an exhaust hole is formed in the upper end of the shell, a slag discharging hole is formed in the lower end of the shell, and the central axis of the second connector, the central axis of the exhaust hole and the central axis of the slag discharging hole coincide with the Z axis. Solid particles are deposited through the valve element, so that the solid particles entering a measuring pipeline are reduced, abrasion is reduced, and the density detection accuracy is improved.

Description

Technical Field

[0001] This invention relates to the field of drilling fluid density detection technology, specifically to a method and apparatus for detecting the density of non-Newtonian fluids. Background Technology

[0002] In oil drilling operations, drilling fluid, as a non-Newtonian fluid, has a density that is a critical parameter directly affecting drilling safety, wellbore stability, and formation pressure balance. Accurate and real-time monitoring of drilling fluid density can effectively prevent downhole accidents such as blowouts and well collapses, ensuring efficient and safe drilling operations.

[0003] See Figure 1 Existing technology (CN223461417U) discloses an online drilling fluid monitoring device. This device includes a pressure stabilizing tank, a manual three-way ball valve, an explosion-proof pneumatic ball valve, an explosion-proof pressure transmitter, an overflow chamber, a drain pipe, and an explosion-proof temperature transmitter. Fluid is drawn into the pressure stabilizing tank by a pump, and its temperature is measured by the explosion-proof temperature transmitter, which outputs real-time temperature data and triggers a high-temperature alarm via the explosion-proof pneumatic ball valve. The fluid flow is regulated by the manual three-way ball valve, and the fluid flows continuously upward through the explosion-proof pneumatic ball valve to the overflow port, then overflows into the overflow chamber, and finally drains back to the sampling position via the drain pipe, completing the entire fluid circulation when no measurement is being performed. During measurement, the explosion-proof pneumatic ball valve is closed, the fluid in the measurement area is stationary, and the output pressure is measured by the explosion-proof pressure transmitter. The output fluid density is calculated using a formula. This device can perform real-time fluid detection and provide high-temperature alarms. It offers rapid detection, high efficiency, and is applicable to various complex working conditions and fluids.

[0004] The valve core of existing three-way ball valves is mostly a conventional spherical through-hole structure, without a special solid particle separation channel design. There are relatively many solid particles in the drilling fluid. Since they are not separated, too many solid particles are dispersed and retained in the equipment, which can easily wear down the detection components, reduce the service life of the equipment, and reduce the accuracy of density detection due to the large number of fixed particles. Summary of the Invention

[0005] To overcome the shortcomings of the prior art, the present invention aims to provide a non-Newtonian fluid density detection device that reduces the amount of solid particles entering the measuring pipe by depositing solid particles in the valve core, thereby reducing wear and increasing the accuracy of density detection.

[0006] The technical solution adopted in this invention is as follows: A non-Newtonian fluid density detection device includes a pressure stabilizing tank, a three-way ball valve, an explosion-proof pneumatic ball valve, and a measuring pipeline. Drilling fluid enters through the pressure stabilizing tank and sequentially passes through the first port, the third port of the three-way ball valve, and the explosion-proof pneumatic ball valve into the measuring pipeline. The second port is used for draining fluid and venting air. The three-way ball valve includes a valve core rotatably mounted in a housing. The valve core has a communicating cavity, which is connected to the first port, the second port, and the third port. The first interface is a hollow shaft, which is rotatably connected and communicates with the liquid inlet pipe. The central axis of the first interface and the third interface is parallel to the Y-axis. The upper end of the outer shell is provided with an exhaust hole, and the lower end of the outer shell is provided with a slag discharge hole. The central axis of the second interface, the exhaust hole, and the slag discharge hole coincides with the Z-axis. In the venting state, the third port is connected to the liquid outlet pipe, and the vent hole is connected to the second port; In the slag discharge state, by rotating the hollow shaft along the Y-axis, the third interface can be misaligned and blocked with the liquid outlet pipe, the vent hole is blocked, and the slag discharge hole is connected to the second interface.

[0007] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Taking advantage of the different densities of gas and solid, which are located at the top and bottom of the drilling fluid respectively, after entering the valve core through the first interface, the gas is discharged from the second interface, while solid particles easily settle inside the valve core. When detecting density, the third interface no longer needs to supply drilling fluid. At this time, rotating the valve core connects the bottom slag discharge hole, which can discharge the solid particles inside the valve core. Therefore, it is not necessary to stop the machine to clean the valve core.

[0008] 2. During slag removal, the subsequent first interface will continue to supply drilling fluid. A small amount of drilling fluid can flush out the solid particles in the valve core, ensuring the cleaning effect.

[0009] In a preferred embodiment of the present invention, the communicating cavity has two tapered cavities that gradually decrease in size from the inside to the outside.

[0010] Beneficial effects: The double-conical cavity provides a directional flow channel for drilling fluid flow and gas-solid separation, and utilizes the gas-solid density difference to achieve natural stratification of bubbles upward and solid particles downward, making it easier to deposit.

[0011] In a preferred embodiment of the present invention, during the exhaust state, the central axis of the first interface is lower than the central axis of the third interface.

[0012] Beneficial effects: With the above configuration, the drilling fluid flows upward from the first interface to the third interface. Due to the higher density of solid particles, they are less likely to flow into the third interface with the fluid and are more likely to settle at the bottom. Meanwhile, gas flows upward more easily, and combined with the conical cavity, it is more likely to accumulate at the top, making it easier for the gas to escape. In a preferred embodiment of the present invention, the upper part of the connecting cavity is provided with an arc-shaped air guide rib extending from the first interface to the second interface.

[0013] Beneficial effects: The air guide can guide the flow of drilling fluid, reduce eddies and turbulence in the flow channel, make the drilling fluid flow more stable, and prevent separated air bubbles from being re-mixed into the drilling fluid due to eddies.

[0014] In a preferred embodiment of the present invention, the lower part of the connecting cavity is provided with an arc-shaped slag guide rib extending from the first interface to the bottom of the connecting cavity.

[0015] Beneficial effects: The directional guiding effect of the arc-shaped slag guide ribs allows solid particles to quickly settle and gather towards the slag discharge hole, making it easier for them to settle at the bottom.

[0016] In a preferred embodiment of the present invention, the outer wall of the hollow shaft is provided with a toothed ring, and the toothed ring meshing with the toothed ring is driven to rotate by a drive motor, thereby controlling the state of the valve core.

[0017] Beneficial effects: Enables electric automated control of the valve core, replacing manual operation and reducing the labor intensity of on-site operators.

[0018] The present invention also provides a method for detecting the density of a non-Newtonian fluid, comprising the following steps: S1: The drilling fluid is fed into the pressure stabilizing tank through the inlet, and the pressure stabilizing tank is used to stabilize the pressure and flow rate of the non-Newtonian fluid; S2: The three-way ball valve is in the venting state. When the explosion-proof pneumatic ball valve is opened, the drilling fluid enters the three-way ball valve through the first interface, the drilling fluid with air bubbles is discharged through the second interface, and the remaining drilling fluid enters the measuring pipe section through the third interface and the explosion-proof pneumatic ball valve. S3: After the measuring pipe section is filled with drilling fluid, close the explosion-proof pneumatic ball valve to make the non-Newtonian fluid in the measuring pipe section stand still, start the measurement, switch the three-way ball valve to the slag discharge state to complete the slag discharge, and then switch it to the venting state. S4: Measure the pressure of non-Newtonian fluids at different heights using an explosion-proof pressure transmitter, measure the temperature of non-Newtonian fluids using an explosion-proof temperature transmitter, calculate the density, and wait for the next density test. Attached Figure Description

[0019] Figure 1 This is a structural schematic diagram of an existing online drilling fluid monitoring device; Figure 2 This is a three-dimensional sectional view of the exhaust state of Embodiment 1 of the non-Newtonian fluid density detection device of the present invention. Figure 3 This is a three-dimensional sectional view of the slag discharge state in Embodiment 1 of the non-Newtonian fluid density detection device of the present invention. Figure 4This is a perspective sectional view of Embodiment 2 of the non-Newtonian fluid density detection device of the present invention; Figure 5 This is a three-dimensional sectional view of Embodiment 3 of the non-Newtonian fluid density detection device of the present invention.

[0020] The attached reference numerals include: liquid inlet 11, pressure stabilizing tank 12, three-way ball valve 13, explosion-proof pneumatic ball valve 14, explosion-proof pressure transmitter 15, drain pipe 16, explosion-proof temperature transmitter 17, measuring pipe 18, outer shell 21, valve core 22, connecting cavity 23, first interface 24, second interface 25, third interface 26, liquid outlet pipe 261, vent hole 27, slag discharge hole 28, toothed ring 29, arc-shaped air guide rib 31, arc-shaped slag guide rib 32, annular retaining ring 41, sedimentation tank 42, and notch 43. Detailed Implementation

[0021] Typical embodiments embodying the features and advantages of the present invention will be specifically described in the following description. It should be understood that the present invention can have various variations in different embodiments without departing from the scope of the present invention, and the descriptions and illustrations herein are for illustrative purposes only and not intended to limit the present invention.

[0022] In the description of this application, the terms "first", "second", etc. are used only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the structure referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0023] See Figure 1 As shown, the existing drilling fluid online monitoring equipment includes a pressure stabilizing tank 12, a three-way ball valve 13, an explosion-proof pneumatic ball valve 14, and a measuring pipe 18. The drilling fluid enters through the inlet 11 of the pressure stabilizing tank 12, and sequentially enters the measuring pipe 18 through the first port, the third port of the three-way ball valve 13, and the explosion-proof pneumatic ball valve 14. The second port is used for draining fluid and venting air. The pressure of the non-Newtonian fluid at different heights is measured by an explosion-proof pressure transmitter 15, and the temperature of the non-Newtonian fluid is measured by an explosion-proof temperature transmitter 17. The density is calculated. After the measurement is completed, the fluid is discharged through the drain pipe 16.

[0024] Example 1 See Figure 2 and Figure 3The non-Newtonian fluid density detection device in this embodiment is an improvement on the drilling fluid online monitoring equipment, with a three-way ball valve 13. The three-way ball valve 13 includes a valve core 22 rotatably installed in the housing 21. The valve core 22 has a connecting cavity 23, which is connected to a first interface 24, a second interface 25, and a third interface 26. The first interface 24 is a hollow shaft, which is rotatably connected to and communicates with the fluid inlet pipe. The central axis of the first interface 24 and the third interface 26 is parallel to the Y-axis. The upper end of the housing 21 is provided with a vent hole 27, and the lower end of the housing 21 is provided with a slag discharge hole. The central axis of the second interface 25, the vent hole 27, and the slag discharge hole 28 coincides with the Z-axis.

[0025] The connecting cavity 23 has two tapered cavities that gradually decrease in size from the inside to the outside.

[0026] In the venting state, the third interface 26 is connected to the liquid outlet pipe, and the vent hole 27 is connected to the second interface 25. The central axis of the first interface 24 is lower than the central axis of the third interface 26. In the slag discharge state, by rotating the hollow shaft along the Y-axis, the third interface 26 and the liquid outlet pipe 261 can be misaligned and blocked simultaneously (the connecting hole inside the liquid outlet pipe 261 is in an eccentric position and is located at the top, while the bottom is solid, so the liquid outlet pipe 261 can be blocked after rotation), the vent hole 27 is blocked, and the slag discharge hole 28 is connected to the second interface.

[0027] The hollow shaft has a toothed ring 29 on its outer wall. The toothed ring 29, which meshes with the shaft, is driven by a drive motor to rotate, thereby controlling the state of the valve core 22.

[0028] The non-Newtonian fluid density detection method in this embodiment is as follows: S1: The drilling fluid is fed into the pressure stabilizing tank 12 through the inlet 11, and the pressure stabilizing tank 12 is used to stabilize the pressure and flow rate of the non-Newtonian fluid; S2: When the three-way ball valve 13 is in the venting state, the explosion-proof pneumatic ball valve 14 is opened. The drilling fluid enters the three-way ball valve 13 through the first port 24, the drilling fluid with air bubbles is discharged through the second port 25, and the remaining drilling fluid enters the measuring pipe section through the third port 26 and the explosion-proof pneumatic ball valve 14. S3: After the measuring pipe section is filled with drilling fluid, close the explosion-proof pneumatic ball valve 14 to make the non-Newtonian fluid in the measuring pipe section stand still and start the measurement. Switch the three-way ball valve 13 to the slag discharge state to complete the slag discharge, and then switch it to the exhaust state. S4: Measure the pressure of the non-Newtonian fluid at different heights using the explosion-proof pressure transmitter 15, measure the temperature of the non-Newtonian fluid using the explosion-proof temperature transmitter 17, calculate the density, and wait for the next density test.

[0029] The following effects are achieved in this embodiment: 1. Utilizing the density difference between gas and solid, air bubbles in the drilling fluid naturally gather upwards and are discharged from the vent 27 through the second interface 25, while solid particles deposit downwards within the valve core 22. The venting and slag removal channels are independent, avoiding particle entrainment during venting and air bubble backflow during slag removal, reducing direct interference from gas and solid particles on differential pressure density detection, and making the detection data more accurate. 2. During density detection, the explosion-proof pneumatic ball valve 14 is closed. While the fluid in the measuring pipe 18 is stationary, rotating the valve core 22 switches to the slag removal state, connecting the slag removal hole to the second interface 25, enabling rapid discharge of solid particles from the valve core 22. Furthermore, during slag removal, the first interface 24 continuously supplies drilling fluid, using a small amount of drilling fluid to quickly flush out the particles, ensuring effective slag removal without interrupting the detection process. 3. The valve core 22 connecting cavity 23 is provided with two tapered cavities that gradually narrow from the inside to the outside. In the exhaust state, the central axis of the first interface 24 is lower than the central axis of the third interface 26, which provides a directional flow channel for drilling fluid flow and gas-solid separation, and further guides the bubbles upward and the solid particles downward to naturally stratify.

[0030] Example 2 See Figure 4 Based on Embodiment 1, the non-Newtonian fluid density detection device of this embodiment has an arc-shaped air guide rib 31 extending from the first interface 24 to the second interface 25 at the upper part of the connecting cavity 23, and an arc-shaped slag guide rib 32 extending from the first interface 24 to the bottom of the connecting cavity 23 at the lower part. In this embodiment, the arc-shaped air guide rib 31 can guide the flow of drilling fluid, reduce eddies and turbulence in the flow channel, make the drilling fluid flow more stable, and prevent separated air bubbles from re-mixing into the drilling fluid due to eddies; the directional guiding effect of the arc-shaped slag guide rib 32 allows solid particles to quickly settle and gather towards the slag discharge hole, making it easier for them to deposit at the bottom.

[0031] Example 3 See Figure 5 Based on Embodiment 3, in this embodiment of the non-Newtonian fluid density detection device, the lower part of the connecting cavity 23 is provided with an annular baffle 41, and the annular baffle 41 and the bottom of the connecting cavity 23 form a deposition groove 42. The top and bottom surfaces of the annular baffle cross-section are both inclined surfaces, and the two inclined surfaces approach each other from the outside to the inside. The annular baffle 41 is provided with multiple notches 43, and multiple arc-shaped slag guide ribs 32 form multiple flow channels corresponding to the notches 43.

[0032] With the above configuration, guided by the arc-shaped slag guide rib 32, a large number of solid particles can easily enter the sedimentation tank 42 through the notch 43. Due to the annular baffle 41, the solid particles in the sedimentation tank 42 are less likely to float to the surface with the liquid, ensuring the sedimentation effect. During slag discharge, due to the inclined surface of the annular baffle 41, solid particles are less likely to get stuck in the sedimentation tank 42 and can easily flow downwards from the middle for discharge, making it less likely for them to get stuck near the third interface 26.

[0033] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A non-Newtonian fluid density detection device, comprising a pressure stabilizing tank, a three-way ball valve, an explosion-proof pneumatic ball valve, and a measuring pipe, wherein drilling fluid enters through the pressure stabilizing tank, sequentially passes through the first port and the third port of the three-way ball valve, and then through the explosion-proof pneumatic ball valve into the measuring pipe, and the second port is used for draining fluid and venting air, characterized in that: The three-way ball valve includes a valve core rotatably mounted inside a housing, and the valve core has a communicating cavity, which is connected to a first interface, a second interface, and a third interface. The first interface is a hollow shaft, which is rotatably connected and communicates with the liquid inlet pipe. The central axis of the first interface and the third interface is parallel to the Y-axis. The upper end of the outer shell is provided with an exhaust hole, and the lower end of the outer shell is provided with a slag discharge hole. The central axis of the second interface, the exhaust hole, and the slag discharge hole coincides with the Z-axis. In the venting state, the third port is connected to the liquid outlet pipe, and the vent hole is connected to the second port; In the slag discharge state, by rotating the hollow shaft along the Y-axis, the third interface can be misaligned and blocked with the liquid outlet pipe, the vent hole is blocked, and the slag discharge hole is connected to the second interface.

2. The non-Newtonian fluid density detection device according to claim 1, characterized in that: The connecting cavity consists of two tapered cavities, one above the other, that gradually decrease in size from the inside out.

3. The non-Newtonian fluid density detection device according to claim 2, characterized in that: In the exhaust state, the central axis of the first interface is lower than the central axis of the third interface.

4. The non-Newtonian fluid density detection device according to claim 2, characterized in that: The upper part of the connecting cavity is provided with an arc-shaped air guide rib running from the first interface to the second interface.

5. The non-Newtonian fluid density detection device according to claim 2, characterized in that: The lower part of the connecting cavity is provided with an arc-shaped slag guide rib extending from the first interface to the bottom of the connecting cavity.

6. The non-Newtonian fluid density detection device according to claim 1, characterized in that: The hollow shaft has a toothed ring on its outer wall. The toothed ring, which meshes with the shaft, is driven by a drive motor to rotate, thereby controlling the state of the valve core.

7. A method for detecting the density of a non-Newtonian fluid, using the non-Newtonian fluid density detection device according to any one of claims 1-6, characterized in that, Includes the following steps: S1: The drilling fluid is fed into the pressure stabilizing tank through the inlet, and the pressure stabilizing tank is used to stabilize the pressure and flow rate of the non-Newtonian fluid; S2: The three-way ball valve is in the venting state. When the explosion-proof pneumatic ball valve is opened, the drilling fluid enters the three-way ball valve through the first interface, the drilling fluid with air bubbles is discharged through the second interface, and the remaining drilling fluid enters the measuring pipe section through the third interface and the explosion-proof pneumatic ball valve. S3: After the measuring pipe section is filled with drilling fluid, close the explosion-proof pneumatic ball valve to make the non-Newtonian fluid in the measuring pipe section stand still, start the measurement, switch the three-way ball valve to the slag discharge state to complete the slag discharge, and then switch it to the venting state. S4: Measure the pressure of non-Newtonian fluids at different heights using an explosion-proof pressure transmitter, measure the temperature of non-Newtonian fluids using an explosion-proof temperature transmitter, calculate the density, and wait for the next density test.

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