Inhibition evaluation device and method

Abstract

The invention relates to the technical field of inhibitive ability evaluation, and provides an inhibitive ability evaluation device and method.The inhibitive ability evaluation device comprises a reaction tank and a supporting frame used for supporting the reaction tank, the reaction tank comprises a first tank body and a second tank body, the first tank body and the second tank body are movably connected and communicated, and the first tank body is provided with a groove used for containing a filter screen; the filter screen is movably connected with the first tank body, a plurality of pressure sensors are also arranged in the first tank body, the first tank body and the second tank body are respectively provided with a feeding hole, and an opening part of each feeding hole is provided with a ball valve, so that the change of expansion pressure along with depth caused by hydration can be tested, and the inhibition effect of drilling fluid or an inhibitor and the required inhibitor dosage can be determined according to the change.

Description

Technical Field

[0001] The present invention relates to the technical field of inhibitory evaluation, and in particular, to an inhibitory evaluation device and method. Background Art

[0002] In geotechnical engineering, it is very crucial to inhibit the swelling pressure of expansive soil. Expansive soil contains clay minerals such as montmorillonite. When these minerals encounter water, the lattice spacing increases, resulting in the swelling of the soil mass. Therefore, inhibitors are needed to inhibit the swelling pressure. The inhibitors are mainly divided into inorganic inhibitors and organic inhibitors. Inorganic inhibitors can change the charge characteristics of the clay particle surface. They carry negative charges, and cations can be adsorbed on the particle surface. The ions in the inhibitor can displace the exchangeable cations originally adsorbed on the clay particle surface, causing changes in the double-layer structure of the clay particles, reducing the hydration tendency of the particles, and thus reducing the swelling pressure. Organic inhibitors can form a protective film on the clay particle surface, preventing water molecules from entering the crystal layer structure of the clay minerals. By physical adsorption or chemical cross-linking, they cover the clay particle surface, reducing the possibility of clay swelling when encountering water, and thus reducing the damage of the swelling pressure to the geotechnical engineering structure. Using inhibitors to treat expansive soil can effectively reduce problems such as foundation heave and road deformation caused by swelling pressure, thereby improving the stability and safety of the engineering structure.

[0003] Currently, in the existing technologies, there are gaps between the inhibitory evaluation experiments and the actual situation. It is impossible to directly simulate the on-site situation to measure the swelling pressure to achieve the purpose of evaluating the inhibitory effect of the inhibitor, nor can the dosage of the inhibitor be determined, which has certain drawbacks. Summary of the Invention

[0004] The first object of the present application is to provide an inhibitory evaluation device, which can test the change of the swelling pressure caused by hydration with depth, and thereby determine the inhibitory effect of the drilling fluid or inhibitor and the required dosage of the inhibitor.

[0005] Another object of the present application is to provide a test method for the inhibitory evaluation device.

[0006] To solve the above technical problems, the technical solution adopted by the present application is as follows:

[0007] On the one hand, an embodiment of the present application provides an inhibitory evaluation device, including a reaction tank and a support frame for supporting the reaction tank. The reaction tank includes a first tank body and a second tank body. The first tank body and the second tank body are movably connected and communicated. The first tank body is provided with a groove for accommodating a filter screen, and the filter screen is movably connected to the first tank body. A plurality of pressure sensors are further arranged in the first tank body. Feed ports are provided on both the first tank body and the second tank body, and a ball valve is arranged at the opening of the feed port.

[0008] The water invasion of the drilling fluid into the formation first forms a filter cake on the wellbore wall. The filtrate enters the formation through the filter cake and reacts with the rocks and clay minerals in the formation. Especially for swelling clay (montmorillonite), swelling will occur after contact, leading to wellbore instability, caving and collapse of the wellbore wall.

[0009] This experiment simulates this process. First, a mud cake is formed on the filter paper, and the filtrate enters the second tank at the lower part and reacts with montmorillonite, which will cause the montmorillonite to hydrate and swell, and the swelling will generate pressure on the surrounding of the tank.

[0010] This experiment uses the generated swelling pressure to measure the inhibition of the drilling fluid. The inhibitor in the drilling fluid will prevent the swelling of sodium montmorillonite, thus weakening the swelling pressure. Affected by multiple factors: 1. The size of the filtration loss; 2. The action ability of the inhibitor; 3. The content of the inhibitor.

[0011] Combining the filtration loss and inhibition. A more comprehensive evaluation of the impact of the drilling fluid on water invasion of the formation is carried out.

[0012] In some embodiments of the present application, a filter element is provided on the above-mentioned filter screen. The filter element can filter out the solids in the drilling fluid. The solids do not have an inhibitory effect on the hydration swelling of montmorillonite, but the entry of the solids into the second tank will cause an error in the swelling pressure and affect the final result.

[0013] In some embodiments of the present application, the above-mentioned filter element is one or more of filter paper, filter cloth, ceramic filter element, core and filter membrane. According to the on-site environment, such as the porosity of different formations, different filter elements are selected. The core can truly simulate the situation of formation filtration loss. At the same time, when dealing with requirements for temperature resistance and pH, the corresponding filter element is selected to meet the evaluation requirements under different environments.

[0014] In some embodiments of the present application, the above-mentioned second tank is provided with studs protruding, and the first tank is correspondingly provided with threaded grooves. The first tank and the second tank are threadedly connected. The threaded connection method can realize the detachable connection of the first tank and the second tank, and the connection is tight and easy to operate, which can ensure the sealing of the reaction tank during the experiment, prevent the leakage of reaction substances, and at the same time can also meet the technical purpose of disassembly and assembly in the experimental steps, simplifying the experimental process.

[0015] In some embodiments of the present application, the above-mentioned also includes a data acquisition instrument, which is electrically connected to multiple pressure sensors. The pressure sensors convert the monitored pressure signals into electrical signals and transmit them to the data acquisition instrument. The data acquisition instrument can collect, record and store pressure data in real time, which is convenient for subsequent analysis and processing of the data, improving the acquisition efficiency and accuracy of experimental data.

[0016] In some embodiments of the present application, the above-mentioned pressure sensors are 10.

[0017] In some embodiments of the present application, the height of the above-mentioned first tank body is 20 cm, and the inner diameter of the tank is 4 cm.

[0018] In some embodiments of the present application, the height of the above-mentioned second tank body is 7 cm, and the inner diameter of the tank is 4 cm.

[0019] On the other hand, the embodiments of the present application provide a test method for an inhibitory evaluation device, which includes the following steps: S1. Close the ball valve of the second tank body and add drilling fluid or inhibitor aqueous solution; S2. Close the ball valve of the first tank body, add bentonite into the first tank body, compact it and make it level with the position of the filter screen; S3. Place a filter element on the bentonite and install the filter screen; S4. Invert the first tank body and connect it to the second tank body, then invert the reaction tank and place it on the placement rack so that the first tank body abuts against the placement rack; S5. Open the ball valve of the second tank body and apply pressure; S6. Record the pressure values at different monitoring points through multiple pressure sensors; S7. Process the recorded data and evaluate the strength of inhibition.

[0020] In some embodiments of the present application, the addition amount of the drilling fluid or inhibitor aqueous solution in the above step S1 is 40 mL. By determining the appropriate solution addition amount, it is ensured that the experimental reaction is carried out in a suitable liquid environment, improving the accuracy and repeatability of the experimental results.

[0021] In some embodiments of the present application, the applied pressure in the above step S5 is 1 MPa. This pressure condition simulates the pressure situation in actual engineering, making the experimental conditions closer to the actual application scenario, so that the test results have more practical reference value and can accurately reflect the swelling pressure characteristics and inhibitory performance of substances under this pressure.

[0022] In some embodiments of the present application, the data processing in the above step S7 is specifically as follows: draw a pressure change trend graph through the pressure data obtained at different monitoring points, and calculate the area of the trend graph. Evaluate the strength of inhibition through the size of the area. By drawing a pressure change trend graph for the pressure data at different detection points, the change trend of the pressure can be intuitively displayed. The filtrate will adsorb and lose a certain amount of inhibitor when passing through the core. Therefore, the inhibitor concentration can be evaluated through the swelling pressure distribution of the core. Calculating the area of the trend graph can quantify the overall situation of the pressure change. Since the strength of inhibition is closely related to the pressure change, the strength of inhibition can be evaluated through the size of the area, establishing a quantitative relationship between the data and the inhibition, and evaluating the strength of inhibition in an intuitive graphical and quantitative area calculation method, making the evaluation results more scientific, accurate, intuitive, and facilitating the analysis and comparison of the inhibition situations under different experimental conditions.

[0023] In some embodiments of the present application, the above evaluation method is specifically as follows: when the area S ≤ 40, the inhibition is excellent; when 40 < S ≤ 45, the inhibition is good; when 45 < S, the inhibition is poor. The specific rules for judging the strength of inhibition according to the area size of the pressure difference trend graph are clarified, so that the evaluation process has a clear quantitative basis. Different area ranges correspond to different inhibition levels, thereby realizing accurate grading and evaluation of inhibition, providing a clear evaluation standard, making the evaluation of the strength of inhibition objective, accurate and repeatable, and facilitating unified comparison and judgment in different experiments or applications.

[0024] Compared with the prior art, the embodiments of the present application have at least the following advantages or beneficial effects:

[0025] 1. Traditional evaluation methods for swelling pressure often lack clear quantitative criteria, and evaluating inhibition often relies on experience or qualitative descriptions, which may lead to subjectivity and inconsistency in evaluation results. The present invention quantifies the strength of inhibition through the area of the pressure change trend graph, clarifies the inhibition levels (excellent, good, poor) corresponding to different area intervals, provides a scientific and repeatable quantitative standard for inhibition evaluation, and avoids subjective errors.

[0026] 2. Existing methods all study the filtration process and the hydration process separately. The present invention combines the filtration process and the hydration process, and can truly and comprehensively reflect the water invasion process of the drilling fluid into the formation.

[0027] 3. The present invention simplifies the experimental process and device, shortens the testing time, can realize on-site rapid testing, and thus guides the adjustment of the performance of the drilling fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for use in the embodiments. It should be understood that the following drawings only show some embodiments of the present invention, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0029] Figure 1 Structural schematic of an inhibition evaluation device provided by the present application Figure 1 ;

[0030] Figure 2 Structural schematic of an inhibition evaluation device provided by the present application Figure 2 ;

[0031] Figure 3 Trend graph of pressure detection points in Example 2 of the evaluation method of an inhibition evaluation device provided by the present application;

[0032] Figure 4 The trend chart of the pressure detection points in Embodiment 3 of the evaluation method of an inhibitory evaluation device provided by this application;

[0033] Figure 5 The trend chart of the pressure detection points in Embodiment 4 of the evaluation method of an inhibitory evaluation device provided by this application.

[0034] Icon: 100 - Second tank; 110 - Ball valve; 200 - First tank; 210 - Filter screen; 220 - Filter element; 230 - Pressure sensor; 300 - Support frame; 400 - Stud. Detailed implementation manners

[0035] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. For those not specified in the embodiments, they shall be carried out according to conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified by the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0036] It should be noted that, without conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to specific embodiments.

[0037] The features and performance of the present invention will be further described in detail below in conjunction with embodiments.

[0038] Embodiment 1

[0039] Please refer to Figure 1-2 , Figure 1 as shown in the structural schematic diagram of the embodiment of this application Figure 1 , Figure 2 as shown in the structural schematic diagram of the embodiment of this application Figure 2 .

[0040] This application provides an inhibitory evaluation device, which includes a reaction tank and a support frame 300 for supporting the reaction tank. The reaction tank includes a first tank 200 and a second tank 100. The first tank 200 and the second tank 100 are movably connected and communicated. The first tank 200 is provided with a groove for accommodating a filter screen 210. The filter screen 210 is movably connected to the first tank 200. A plurality of pressure sensors 230 are further provided in the first tank 200. Both the first tank 200 and the second tank 100 are provided with feed ports, and a ball valve 110 is provided at the opening of the feed port.

[0041] In order to achieve the filtering effect of the test liquid, a filter element 220 is provided on the above-mentioned filter screen 210.

[0042] In order to further improve the filtering effect, the above-mentioned filter element 220 is filter paper.

[0043] To improve the accuracy of the data at the pressure monitoring points, the above-mentioned multiple pressure sensors 230 are specifically 10 in number.

[0044] To achieve the detachable connection between the first tank 200 and the second tank 100, the second tank 100 is provided with a stud 400 protruding therefrom, and the first tank 200 is correspondingly provided with a threaded groove. The first tank 200 and the second tank 100 are in threaded connection. The threaded connection method can achieve the detachable connection between the first tank 200 and the second tank 100, and the connection is tight and easy to operate, which can ensure the sealing performance of the reaction tank during the experiment, prevent the leakage of reaction substances, and at the same time can also meet the technical purposes of disassembly and assembly in the experimental steps, simplifying the experimental process.

[0045] To obtain the test data of the pressure sensor 230, the above also includes a data acquisition instrument, which is electrically connected to the multiple pressure sensors 230. The pressure sensor 230 converts the monitored pressure signal into an electrical signal and transmits it to the data acquisition instrument. The data acquisition instrument can collect, record and store the pressure data in real time, facilitating subsequent analysis and processing of the data, and improving the acquisition efficiency and accuracy of the experimental data.

[0046] To optimize the experimental data, the first tank 200 is set to be 20 cm high and 4 cm in inner diameter, and the second tank 100 is 7 cm high and 4 cm in inner diameter.

[0047] To pressurize the second tank 100, a gas cylinder is also provided, which can pressurize the second tank 100 constantly and controllably and reach the required pressure value.

[0048] During use, first close the ball valves 110 of the first tank 200 and the second tank 100, add the test solution to the second tank 100, add bentonite to the first tank 200, compact the bentonite to be flush with the position of the filter screen 210, then place a filter paper on the bentonite and install the filter screen 210. After installation, invert the first tank 200 and connect it to the second tank 100 through the stud 400. After connection, invert it again so that the second tank 100 is located above the first tank 200 and place it on the support frame 300. Open the ball valve 110 of the second tank 100, inflate and pressurize the second tank 100, and record the pressure data at different pressure sensors 230 through the data acquisition instrument.

[0049] Example 2

[0050] This Example 2 provides a test method for an inhibitory evaluation device, including the following steps:

[0051] S1. Close the ball valve 110 of the second tank 100 and add 40 mL of drilling fluid. The drilling fluid is a potassium-based polysulfonate drilling fluid system, which consists of 2% bentonite + 3% sulfonated lignite + 3% sulfonated resin + 7% potassium chloride + 2% sulfonated asphalt + 0.2% NaOH + 45% barite;

[0052] S2. Close the ball valve 110 of the first tank 200, add bentonite to the first tank 200, compact it until it is level with the position of the filter screen 210;

[0053] S3. Place a filter paper on the bentonite and install the filter screen 210;

[0054] S4. Invert the first tank 200 and connect it to the second tank 100. After connection, invert it again so that the second tank 100 is above the first tank 200, and place it on the placement rack so that the first tank 200 abuts against the placement rack;

[0055] S5. Open the ball valve 110 of the second tank 100 and add gas to pressurize it to 1 MPa;

[0056] S6. Record the pressure values at different monitoring points of multiple pressure sensors 230 through a data acquisition instrument;

[0057] S7. Draw a trend chart of the pressure detection points based on the pressure data obtained at different detection points, and calculate the area of the trend chart. Use the area of the trend chart as the evaluation criterion to evaluate the strength of inhibition. The trend chart is as shown in Figure 3 shown, and the evaluation method is shown in Table 1:

[0058] Table 1

[0059] Area / S Inhibitory S≤40 Excellent inhibitory effect 40＜S≤45 Good inhibitory effect 45＜S Poor inhibitory effect

[0060] As Figure 3 shown, use Origin to make a trend chart, take the connection line at both ends to calculate the area in the chart, and obtain the area S as 38. Using Table 1 as the evaluation criterion, the inhibition of the potassium-based polysulfonate drilling fluid system is excellent.

[0061] Comparative Example 1

[0062] In this Comparative Example 1, the inhibition of the drilling fluid of the potassium-based polysulfonate drilling fluid system was evaluated using a conventional method in the prior art. The specific method is as follows:

[0063] (1) Core preparation: Place the bentonite in an oven and dry it at a temperature of 105 °C (with an error controlled within ±3 °C) for 4 h. Weigh 10.00 g of the dried bentonite and put it into the measuring cylinder of the shale swelling instrument. After maintaining a pressure of 4.0 MPa on the press for 5 min, obtain the core required for measuring the linear swelling rate, and record the core height ΔL;

[0064] (2) Preparation of sample solution: Add 3.00 g of samples of different inhibitors to 300 mL of distilled water respectively, stir for 20 min to completely dissolve them.

[0065] (3) After installing the core-containing measuring cylinder on the shale swelling instrument, add each sample solution to the measuring cylinder and record the initial reading R 0 and the readings R at different times X , and at the same time, use distilled water for blank test.

[0066] According to the standard "SY / T6335-1997", evaluate the linear swelling rate of different inhibitors. The calculation formula of the linear swelling rate is shown in Equation 1:

[0067] Equation 1, where Sr is the linear swelling rate of bentonite; ΔR is the swelling amount of bentonite, obtained from (R X -R 0 ), in mm; ΔL is the core height, in mm.

[0068] According to Equation 1, the Sr of the potassium-based polysulfonate drilling fluid system is 12%, and the inhibitory evaluation is excellent. According to the results, it can be known that the drilling fluid inhibition of the potassium-based polysulfonate drilling fluid system in Comparative Example 1 is excellent, which is consistent with the results in Example 2, proving the feasibility and accuracy of the evaluation method in Example 2. However, the method provided in this application optimizes the evaluation steps, shortens the evaluation time, is more suitable for on-site construction applications, and improves construction efficiency.

[0069] Example 3

[0070] This Example 3 provides a test method for an inhibitory evaluation device, including the following steps:

[0071] S1. Close the ball valve 110 of the second tank 100 and add 40 mL of drilling fluid. The drilling fluid is a polymer drilling fluid system, which is composed of 3% bentonite + 0.2% cationic polyacrylamide + 0.3% polyanionic cellulose + 0.1% xanthan gum + 0.5% polyamine inhibitor + 30% barite;

[0072] S2. Close the ball valve 110 of the first tank 200, add bentonite to the first tank 200, compact it and make it level with the position of the filter screen 210;

[0073] S3. Place a filter cloth on the bentonite and install the filter screen 210;

[0074] S4. Invert the first tank 200 and connect it to the second tank 100. After connection, invert it again so that the second tank 100 is above the first tank 200 and place it on the placement rack so that the first tank 200 abuts against the placement rack;

[0075] S5. Open the ball valve 110 of the second tank 100 and add gas to pressurize it to 1 MPa;

[0076] S6. Record the pressure values at different monitoring points of multiple pressure sensors 230 through a data acquisition instrument;

[0077] S7. Draw a trend chart of pressure detection points based on the pressure data obtained at different detection points, and calculate the area of the trend chart. Use the area of the trend chart as the evaluation criterion to evaluate the strength of inhibition. The trend chart is as Figure 4 shown, and the evaluation method is shown in Table 1:

[0078] Table 1

[0079] Area / S Inhibitory S≤40 Excellent inhibitory effect 40＜S≤45 Good inhibitory effect 45＜S Poor inhibitory effect

[0080] As Figure 4 shown, use Origin to draw a trend chart, and take the connecting line at both ends to calculate the area in the figure. The obtained area S is 42.5. Using Table 1 as the evaluation criterion, the inhibition of the polymer drilling fluid system is good.

[0081] Comparative Example 2

[0082] In this Comparative Example 2, the conventional method in the prior art is used to evaluate the inhibition of the drilling fluid of the polymer drilling fluid system. The specific method is to use the rolling recovery test.

[0083] In this experiment, the rolling recovery rate (120 °C, 16 h) of the polymer drilling fluid system on shale is used as the evaluation index. The specific test steps are as follows:

[0084] (1) Screen the collected drill cuttings with a double-layer sampling sieve with hole side lengths of 3.27 mm and 2.0 mm respectively, and collect the drill cuttings passing through the sieve with a hole side length of 3.2 mm.

[0085] (2) Take 50.0 g (accurate to 0.1 g) of the prepared drill cuttings and put them into a high-temperature tank filled with 350 mL of evaluation liquid, and tighten the lid.

[0086] (3) Put the high-temperature tank filled with the sample into a drilling fluid roller furnace at 120 °C ± 3 °C and roll for 16 h.

[0087] (4) After rolling at a constant temperature for 16 h, take out the high-temperature tank and cool it to room temperature. Pour all the liquid and rock samples in the tank onto a sampling sieve with a hole side length of 0.42 mm, and wet-screen wash in a water tank filled with tap water for 1.0 min.

[0088] (5) Put the sieved remaining rock samples into a blast drying oven at 105 °C ± 3 °C and dry for 4 h. Take them out and cool, and let them stand in the air for 24 h, then weigh (accurate to 0.1 g) and calculate the one-time rolling recovery rate (R).

[0089] The rolling recovery rate R obtained from the above experimental steps is 95%, and the inhibition evaluation is excellent. From the results, it can be seen that the evaluation results of Comparative Example 2 and Example 3 are inconsistent. The main reason is that during the clay hydration process, after the clay absorbs water, the crystal layers first expand. When the expansion reaches a certain degree, dispersion occurs. The rolling recovery rate mainly evaluates the dispersion ability. However, when the clay swells due to water absorption but has not yet dispersed, the rolling recovery rate test will consider the inhibition to be good, which is obviously inconsistent with the facts. In actual use, this drilling fluid system is difficult to achieve the technical effects evaluated in Comparative Example 2. The method of this application evaluates the water absorption and swelling ability, which can more accurately evaluate the inhibition of the drilling fluid, and the evaluation results are more accurate and reliable.

[0090] Example 4

[0091] This Example 4 provides a test method for an inhibition evaluation device, including the following steps:

[0092] S1. Close the ball valve 110 of the second tank 100 and add 40 mL of drilling fluid. The drilling fluid is a common high-clay drilling fluid, which is composed of 10% bentonite + 0.2% sodium hydroxide + 0.1% xanthan gum;

[0093] S2. Close the ball valve 110 of the first tank 200, add bentonite to the first tank 200, compact it and make it level with the position of the filter screen 210;

[0094] S3. Place a filter paper on the bentonite and install the filter screen 210;

[0095] S4. Invert the first tank 200 and connect it to the second tank 100. After connection, invert it again so that the second tank 100 is above the first tank 200, and place it on the placement rack so that the first tank 200 abuts against the placement rack;

[0096] S5. Open the ball valve 110 of the second tank 100 and add gas to pressurize to 1 MPa;

[0097] S6. Record the pressure values at different monitoring points of multiple pressure sensors 230 through the data acquisition instrument;

[0098] S7. Draw a pressure detection point trend chart based on the pressure data obtained at different detection points and calculate the area of the trend chart. Evaluate the strength of inhibition based on the area of the trend chart. The trend chart is as Figure 5 shown, and the evaluation method is shown in Table 1:

[0099] Table 1

[0100]

[0101]

[0102] As Figure 5As shown, an Origin trend chart is made, and the area in the chart is calculated by connecting the two ends, and the area S is obtained as 50. Taking Table 1 as the evaluation standard, the inhibition of the ordinary high-clay drilling fluid system is poor.

[0103] Comparative Example 3

[0104] This Comparative Example 3 is basically the same as Comparative Example 1. The difference is that the drilling fluid system is an ordinary high-clay drilling fluid system. According to the test method in Comparative Example 1, the Sr of the ordinary high-clay drilling fluid system is 43%, and the inhibition evaluation is poor. From the results, it can be seen that the experimental results in Comparative Example 3 are consistent with the experimental results in Example 4, further proving the feasibility and accuracy of the evaluation method in Example 4. However, the method provided in this application optimizes the evaluation steps, reduces the evaluation time, is more suitable for on-site construction applications, and improves construction efficiency.

[0105] The embodiments described above are some, but not all, embodiments of the present invention. The detailed description of the embodiments of the present invention is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

Claims

1. An inhibitory evaluation device, characterized in that: include: A reaction tank and a support frame for supporting the reaction tank; The reaction tank comprises a first tank body and a second tank body, and the first tank body and the second tank body are movably connected and communicated; The first tank body is provided with a groove for accommodating a filter screen, the filter screen is movably connected to the first tank body, and the first tank body is also provided with a plurality of pressure sensors; The first tank body and the second tank body are both provided with a feed port, and a ball valve is provided at the opening of the feed port.

2. The inhibitory evaluation device according to claim 1, characterized in that: A filter element is arranged on the filter screen.

3. The inhibitory evaluation device according to claim 2, characterized in that: The filter element is one or more of filter paper, filter cloth, ceramic filter element, rock core and filter membrane.

4. The inhibitory evaluation device according to claim 1, characterized in that: The first tank body and the second tank body are threadedly connected.

5. The inhibitory evaluation device according to claim 1, characterized in that: It also includes a data acquisition device, which is electrically connected to the plurality of pressure sensors.

6. An evaluation method based on the inhibitory evaluation device according to any one of claims 1 to 5, characterized in that: The following steps are involved: S1. Close the ball valve of the second tank and add drilling fluid or inhibitor aqueous solution; S2, closing the ball valve of the first tank body, adding bentonite into the first tank body, compacting it and making it level with the position of the filter screen; S3, placing the filter element on the bentonite and installing the filter screen; S4, inverting the first tank body and connecting it to the second tank body, then inverting the reaction tank and placing it on the placement rack, so that the first tank body abuts against the placement rack; S5, opening the ball valve of the second tank and pressurizing; S6. Recording the pressure values ​​of different monitoring points by using a plurality of the pressure sensors; S7. Process the recorded data and evaluate the strength of inhibition.

7. An evaluation method according to claim 6, characterized in that: The amount of drilling fluid or inhibitor aqueous solution added in step S1 is 40 mL.

8. An evaluation method according to claim 6, characterized in that: The pressurized pressure in step S5 is 1 MPa.

9. An evaluation method according to claim 6, characterized in that: The data processing in step S7 is specifically as follows: obtaining the pressure data of different monitoring points to draw a pressure change trend graph, and calculating the area of ​​the trend graph, and evaluating the strength of the inhibition by the size of the area.

10. An evaluation method according to claim 9, characterized in that: The evaluation method is specifically as follows: when the area S≤40, the inhibition is excellent; when 40<S≤45, the inhibition is good; when 45<S, the inhibition is poor.

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