A rheological property testing device for preparing high-temperature resistant water-based drilling fluid

Abstract

The utility model relates to drilling fluid rheological property detection technical field, especially in kind of rheological property detection device of high temperature resistant water base drilling fluid preparation, including jar body, jar cover and display control screen, the inside wall of jar body is embedded with annular nickel chromium alloy heating tube, the inside wall of jar body is provided with a plurality of platinum resistance temperature sensor from top to bottom equal interval, the inside bottom of jar body is provided with resonance type tuning fork viscosity sensor, the bottom of jar cover is rotatably provided with the pivot, is provided with a plurality of stirring paddles on the pivot, the top of jar cover is installed the rotary motor of drive pivot rotation, and is installed torque sensor on the pivot, the utility model can stably provide the heating function of adapting the 150-250 DEG C demand of deep well, can real time monitoring the temperature distribution of different height drilling fluid in jar, avoids the detection deviation caused by local temperature difference, realizes the synchronous collection of viscosity, dynamic shear force key parameter, and the detection data is more comprehensive.

Description

Technical Field

[0001] This utility model relates to the field of drilling fluid rheological testing technology, and more specifically to a rheological testing device for the preparation of high-temperature water-based drilling fluid. Background Technology

[0002] In the field of oil and gas drilling engineering, water-based drilling fluids have become an indispensable key material in drilling operations due to their advantages such as cost-effectiveness, environmental compatibility, and ease of maintenance. Their rheological properties, as a core performance indicator, encompass key parameters such as viscosity, dynamic shear force, and yield strength, directly determine the drilling fluid's cuttings carrying efficiency, annular flow resistance, and wellbore stability. Excellent rheological properties ensure that the drilling fluid efficiently carries cuttings to the surface, reducing the risk of wellbore collapse and stuck pipe; while abnormal rheological properties can lead to a sharp drop in drilling efficiency and even trigger downhole safety accidents.

[0003] As drilling operations expand into deep and ultra-deep wells, downhole ambient temperatures rise significantly, reaching 150-250°C under normal operating conditions and even higher in extreme scenarios. In such high-temperature environments, water-based drilling fluids are prone to performance degradation due to additive degradation and colloidal structure disruption, leading to uncontrollable fluctuations in rheological properties. Therefore, accurate testing of the rheological properties of drilling fluids under high-temperature conditions is a core prerequisite for optimizing drilling fluid formulations and ensuring the safety and efficiency of deep well drilling operations.

[0004] In the research and development and field preparation of high-temperature resistant water-based drilling fluids, it is necessary to frequently measure their rheological properties at different temperatures to optimize the dosage of treatment agents and the formulation. Currently, rheological testing mainly relies on high-temperature high-pressure rheometers (HTHP rheometers). Although these instruments are highly accurate, they have several drawbacks: imported and high-end domestic HTHP rheometers are expensive, increasing research and development and production costs; they are usually laboratory benchtop devices, bulky and inconvenient for real-time tracking and testing in drilling fluid preparation workshops or on-site. In addition, some simple portable viscometers exist on the market, but they usually lack heating and heat preservation functions, or suffer from uneven heating and poor temperature control accuracy, failing to simulate the actual working temperature of high-temperature resistant drilling fluids. The room-temperature rheological data obtained have limited guiding significance for high-temperature operating conditions. Utility Model Content

[0005] The purpose of this invention is to provide a rheological testing device for the preparation of high-temperature water-based drilling fluid, solving the problem of "no heating / poor temperature control accuracy" in existing portable viscometers.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A rheological testing device for preparing high-temperature water-based drilling fluid includes a tank, a tank cover, and a display and control screen. An annular nickel-chromium alloy heating tube is embedded in the inner wall of the tank. Multiple platinum resistance temperature sensors are evenly spaced from top to bottom on the inner wall of the tank. A resonant tuning fork viscosity sensor is installed at the bottom of the tank. A rotating shaft is rotatably mounted at the bottom of the tank cover, and multiple stirring paddles are mounted on the shaft. A rotary motor driving the rotating shaft is installed at the top of the tank cover. A torque sensor is mounted on the rotating shaft. The annular nickel-chromium alloy heating tube, platinum resistance temperature sensors, resonant tuning fork viscosity sensors, rotary motor, and torque sensors are all electrically connected to the display and control screen.

[0008] Furthermore, an insulation layer is provided inside the side wall of the tank.

[0009] Furthermore, the insulation layer is made of aluminum silicate fiber cotton.

[0010] Furthermore, liquid level markings are provided on the inner wall of the tank.

[0011] Furthermore, a sealing groove is provided on the top edge of the tank, and a fluororubber sealing ring is provided in the sealing groove.

[0012] Furthermore, a drain pipe is provided at the bottom of the tank, and a drain valve is installed on the drain pipe.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] This application utilizes an annular nickel-chromium alloy heating tube embedded in the side wall of the tank to stably provide heating functionality suitable for deep wells at temperatures ranging from 150-250℃. Combined with multiple platinum resistance temperature sensors spaced evenly from top to bottom, it can monitor the temperature distribution of drilling fluid at different heights within the tank in real time, avoiding detection deviations caused by localized temperature differences and solving the problem of existing portable viscometers lacking heating or having poor temperature control accuracy. The resonant tuning fork viscosity sensor at the bottom of the tank can directly detect drilling fluid viscosity, while the torque sensor on the rotating shaft can calculate dynamic shear force and yield value based on stirring resistance. Compared to existing high-temperature, high-pressure rheometers that only perform "single parameter detection" or portable devices that only measure viscosity at room temperature, this application achieves simultaneous acquisition of key parameters such as viscosity and dynamic shear force, resulting in more comprehensive detection data. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model.

[0016] 1. Tank body; 2. Tank cover; 3. Annular nickel-chromium alloy heating tube; 4. Platinum resistance temperature sensor; 5. Resonant tuning fork viscosity sensor; 6. Rotating shaft; 7. Stirring paddle; 8. Rotary motor; 9. Torque sensor; 10. Insulation layer; 11. Sealing groove; 12. Fluororubber sealing ring; 13. Drain pipe; 14. Drain valve. Detailed Implementation

[0017] like Figure 1 As shown, a rheological testing device for preparing high-temperature water-based drilling fluid includes a tank 1, a tank cover 2, and a display and control screen. An annular nickel-chromium alloy heating tube 3 is embedded in the inner wall of the tank 1. Multiple platinum resistance temperature sensors 4 are evenly spaced from top to bottom on the inner wall of the tank 1. A resonant tuning fork viscosity sensor 5 is installed at the bottom of the inner side of the tank 1. A rotating shaft 6 is rotatably mounted at the bottom of the tank cover 2. Multiple stirring paddles 7 are mounted on the rotating shaft 6. A rotary motor 8, which drives the rotating shaft 6, is installed on the top of the tank cover 2. A torque sensor 9 is mounted on the rotating shaft 6. The annular nickel-chromium alloy heating tube 3, platinum resistance temperature sensors 4, resonant tuning fork viscosity sensors 5, rotary motor 8, and torque sensor 9 are all electrically connected to the display and control screen.

[0018] The tank 1 has an insulation layer 10 installed inside the side wall.

[0019] The insulation layer 10 is made of aluminum silicate fiber cotton.

[0020] The inner wall of the tank 1 is provided with liquid level scale lines.

[0021] A sealing groove 11 is provided on the top edge of the tank body 1, and a fluororubber sealing ring 12 is provided at the sealing groove 11. After the tank cover 2 is closed, the fluororubber sealing ring 12 can tightly fill the sealing groove 11 to prevent the leakage of steam formed by the volatilization of drilling fluid at high temperature, thus avoiding the reduction of sample volume and affecting the test results.

[0022] The bottom of the tank 1 is provided with a drain pipe 13, and a drain valve 14 is installed on the drain pipe 13.

[0023] Working principle:

[0024] Open tank lid 2, add the high-temperature resistant water-based drilling fluid to be tested into tank 1 according to the liquid level mark, close tank lid 2, and the fluororubber sealing ring 12 forms a seal in the sealing groove 11; set the target temperature (e.g., 200℃), stirring speed (e.g., 1500r / min, simulating normal drilling shear rate) and testing time (e.g., 30min) through the display control screen; the annular nickel-chromium alloy heating tube 3 is energized for heating, and the platinum resistance temperature sensor 4 collects temperature data at different heights in tank 1 in real time and transmits it to the display control screen. If the temperature is lower than the target value, the control screen automatically increases the heating power; if the temperature is lower than the target value, the control screen automatically increases the heating power. Once the target is met, the heating power is maintained, and the insulation layer 10 reduces heat loss and maintains a stable temperature. The rotary motor 8 starts, driving the rotating shaft 6 to rotate the stirring paddle 7, simulating the downhole shearing environment. At the same time, the resonant tuning fork viscosity sensor 5 detects the drilling fluid viscosity, and the torque sensor 9 detects the torque (converted to dynamic shear force) when the rotating shaft 6 rotates. All data are displayed on the display control screen in real time. If the parameters exceed the threshold, the control screen triggers an audible and visual alarm. After the test is completed, the heating tube and motor are turned off, the drain valve 14 is opened, and the waste liquid is discharged through the drain pipe 13. The tank is rinsed with clean water and then drained again to complete a single test.

[0025] This invention eliminates the need for imported high-temperature and high-pressure rheometers, significantly reducing R&D and on-site testing costs. It is suitable for small and medium-sized drilling fluid companies or for on-site preparation. Precise high-temperature simulation is achieved through annular heating tubes and multi-point temperature control, while an adjustable-speed stirring mechanism replicates dynamic shear, ensuring the testing environment closely approximates actual deep-well conditions. Viscosity and dynamic shear force parameters are acquired simultaneously, and the sealing and anti-contamination design ensures data accuracy and repeatability, providing comprehensive data support for optimizing the formulation of high-temperature water-based drilling fluids (such as adjusting the dosage of treatment agents).

[0026] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A rheological testing device for preparing high-temperature water-based drilling fluid, characterized in that: The device includes a tank body (1), a tank cover (2), and a display control screen. An annular nickel-chromium alloy heating tube (3) is embedded in the inner wall of the tank body (1). Multiple platinum resistance temperature sensors (4) are evenly spaced from top to bottom on the inner wall of the tank body (1). A resonant tuning fork viscosity sensor (5) is installed at the bottom of the inner side of the tank body (1). A rotating shaft (6) is rotatably installed at the bottom of the tank cover (2). Multiple stirring paddles (7) are installed on the rotating shaft (6). A rotary motor (8) that drives the rotating shaft (6) to rotate is installed on the top of the tank cover (2). A torque sensor (9) is installed on the rotating shaft (6). The annular nickel-chromium alloy heating tube (3), platinum resistance temperature sensor (4), resonant tuning fork viscosity sensor (5), rotary motor (8), and torque sensor (9) are all electrically connected to the display control screen.

2. The rheological testing device for preparing high-temperature water-based drilling fluid as described in claim 1, characterized in that: The tank (1) has an insulation layer (10) inside its side wall.

3. The rheological testing device for preparing high-temperature water-based drilling fluid as described in claim 2, characterized in that: The insulation layer (10) is made of aluminum silicate fiber cotton.

4. The rheological testing device for preparing high-temperature water-based drilling fluid as described in claim 1, characterized in that: The inner wall of the tank (1) is provided with liquid level scale lines.

5. The rheological testing device for preparing high-temperature water-based drilling fluid as described in claim 1, characterized in that: The top edge of the tank (1) is provided with a sealing groove (11), and a fluororubber sealing ring (12) is provided at the sealing groove (11).

6. The rheological testing device for preparing high-temperature water-based drilling fluid as described in claim 1, characterized in that: The bottom of the tank (1) is provided with a drain pipe (13), and a drain valve (14) is installed on the drain pipe (13).

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