Rapid surface hydration inhibition evaluation device and method

Abstract

The invention relates to the technical field of surface hydration inhibitive ability evaluation, and provides a rapid surface hydration inhibitive ability evaluation device and method.The rapid surface hydration inhibitive ability evaluation device comprises a sample injection tank, an inhibition tank and a test tank, the sample injection tank is communicated with the inhibition tank, the inhibition tank is further communicated with the test tank, the rapid surface hydration inhibitive ability evaluation device further comprises a gas supply device, and the gas supply device is both communicated with the sample injection tank and the inhibition tank; filter membranes are arranged in the sample introduction tank and the inhibition tank, the two filter membranes are respectively located at a liquid outlet part of the sample introduction tank and a liquid outlet part of the inhibition tank, and conductivity probes are arranged in the inhibition tank and the test tank, so that the inhibition can be semi-quantitatively evaluated by detecting the quantity of cations according to the principle of a surface hydration inhibitor, and the dosage of the inhibitor is determined according to the evaluation result. And the step of evaluating the surface hydration inhibition is optimized, so that the test time is short, and the construction efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of surface hydration inhibition evaluation. Specifically, it relates to a rapid surface hydration inhibition evaluation device and method. Background Art

[0002] In the field of oil extraction, clay materials such as bentonite have a hydration dilemma. In underground engineering, when clay encounters water, it quickly hydrates and swells, changing the mechanical properties of the soil mass, resulting in a decrease in soil strength and an increase in deformation, posing a great threat to the stability of underground structures such as tunnels and foundation pits. Therefore, it is necessary to add surface hydration inhibitors to improve these situations.

[0003] The current surface hydration inhibitor evaluation method requires the use of inhibitors to act on sodium montmorillonite and test its microscopic properties (XRD, thermogravimetry, isothermal adsorption). The testing process is complex and time-consuming, and it is difficult to flexibly respond to complex and different construction environments during construction, affecting the construction progress. At the same time, the quantification of inhibitors cannot achieve accurate test results, and there are certain drawbacks. Summary of the Invention

[0004] An object of the present application is to provide a rapid surface hydration inhibition evaluation device, which can utilize the principle of surface hydration inhibitors, semi-quantitatively evaluate the inhibition by detecting the amount of cations, and thereby determine the dosage of the inhibitor, optimizing the steps of surface hydration inhibition evaluation, making the test time short and increasing the construction efficiency.

[0005] Another object of the present application is to provide a method for a rapid surface hydration inhibition 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 a rapid surface hydration inhibition evaluation device, which includes a device body. The device body includes a sample injection tank, an inhibition tank, and a test tank. The sample injection tank is connected to the inhibition tank, and the inhibition tank is also connected to the test tank. There is a gas supply device, and the gas supply device is connected to both the sample injection tank and the inhibition tank. Filter membranes are provided in both the sample injection tank and the inhibition tank, and the two filter membranes are respectively located at the liquid outlet parts of the sample injection tank and the inhibition tank. Conductivity probes are provided in both the inhibition tank and the test tank.

[0008] Using the principle of surface hydration inhibitor, it first needs to insert into the interlayer of montmorillonite and displace the interlayer cations to play an inhibitory role. Therefore, the inhibitory property can be semi-quantitatively evaluated by detecting the amount of cations, and the dosage of the inhibitor can be determined accordingly. The set filter membrane displaces cations and measures the conductivity of the solution through a conductivity probe to determine the amount of cations, thereby evaluating the surface hydration inhibition property. It can simulate the reaction process of drilling fluid or inhibitor aqueous solution with montmorillonite in actual situations, provide a reliable basis for evaluating the surface hydration inhibition property, help screen out more suitable drilling fluids or inhibitors, improve the control ability of formation hydration problems in drilling engineering, determine the dosage of the inhibitor, and solve the technical problem of unclear inhibitor dosage in the prior art.

[0009] In some embodiments of the present invention, the volumes of the above-mentioned sample injection tank, inhibition tank, and test tank are 400 - 2000 mL.

[0010] In some embodiments of the present invention, the volumes of the above-mentioned sample injection tank, inhibition tank, and test tank are 500 mL.

[0011] In some embodiments of the present invention, a first intake valve is provided between the above-mentioned gas supply device and the sample injection tank, and a second intake valve is provided between the gas supply device and the inhibition tank. The set first intake valve is used to control the intake and pressurization into the sample injection tank, and the second intake valve is used to control the intake and pressurization into the inhibition tank, which can separately control the pressurization processes into the sample injection tank and the inhibition tank, ensure appropriate pressure conditions when the sample injection tank drains liquid to the inhibition tank and the inhibition tank drains liquid to the test tank, ensure the smooth transfer of liquid, and enable precise control of the pressure conditions during the experiment, improving the accuracy and repeatability of the experiment.

[0012] In some embodiments of the present invention, a first drain valve is provided between the above-mentioned sample injection tank and the inhibition tank, and a second drain valve is provided between the inhibition tank and the test tank. The set first and second drain valves control the flow of liquid between the tanks by opening or closing, enabling the directional flow of liquid to meet the experimental requirements.

[0013] In some embodiments of the present invention, the above-mentioned sample injection tank is provided with a first exhaust valve, and the inhibition tank is provided with a second exhaust valve. Since it is necessary to pressurize the sample injection tank and the inhibition tank during the experiment and measure the initial conductivity, and montmorillonite needs to be put in and re-pressurized after the test is completed, the first exhaust valve and the second exhaust valve need to be provided to prevent potential safety hazards caused by opening the tanks under pressurized conditions.

[0014] In some embodiments of the present invention, a data collector is further included. Both conductivity probes are electrically connected to the data collector, which is used to collect the data detected by the conductivity probes, and can record the conductivity values of the samples at different stages in real time and accurately, avoiding the possible errors caused by manual recording, improving the efficiency and accuracy of data collection, and facilitating subsequent analysis and processing of the data.

[0015] In some embodiments of the present invention, stirrers are provided in both the above-mentioned sample injection tank and the inhibition tank. The stirrers are used to stir the liquid. After adding substances (such as drilling fluid, inhibitor aqueous solution, montmorillonite, etc.), the substances can be quickly and evenly mixed by stirring, ensuring the uniformity of the composition of the sample in each tank, making the reaction or measurement process more accurate and reliable, and helping to improve the accuracy and reliability of the experimental results.

[0016] In some embodiments of the present invention, the above-mentioned filter membrane is a nylon filter cloth, and the mesh number of the nylon filter cloth is greater than 80,000 meshes (0.1 micron). The filter membrane in the sample injection tank is mainly used to separate the solid phase in the drilling fluid. The solid phase includes barite, bentonite and plugging materials, and the particle sizes tested are all above 0.1 micron. Therefore, the solid phase and the liquid phase can be effectively separated, and the conductivity of the liquid phase in the drilling fluid can be accurately measured.

[0017] The filter membrane in the inhibition tank is mainly used to separate sodium montmorillonite and the liquid phase. The particle size of sodium montmorillonite after hydration and dispersion is also above 0.1 micron. Therefore, a nylon filter cloth with a mesh number greater than 80,000 is selected to effectively separate sodium montmorillonite and the filtrate after ion exchange, and the conductivity of the filtrate can be accurately measured.

[0018] On the other hand, the embodiments of the present application provide a method for a rapid surface hydration inhibition evaluation device, which includes the following steps: S1. Select the required volume of the sample injection tank, the inhibition tank and the test tank, add drilling fluid or inhibitor aqueous solution to the sample injection tank, and turn on the stirrer in the sample injection tank to stir for 20 min; S2. Open the first drain valve, close the second drain valve, the first exhaust valve and the second exhaust valve, open the first intake valve, pressurize the sample injection tank to 1-2 MPa, and close the first drain valve when the liquid volume in the inhibition tank reaches one-third of the tank volume; S3. Use the conductivity probe in the inhibition tank to measure the conductivity; S4. Open the first exhaust valve and the second exhaust valve, add montmorillonite to the inhibition tank, and turn on the stirrer in the inhibition tank to stir for 1 h; S5. Open the second drain valve and open the second intake valve, pressurize the inhibition tank to 1-2 MPa, and close the second drain valve when the liquid volume in the test tank reaches one-fifth of the tank volume; S6. Use the conductivity probe in the test tank to measure the conductivity; S7. Calculate the difference in conductivity through steps S3 and S6, and obtain the inhibition effect through the surface hydration inhibition evaluation standard.

[0019] In some embodiments of the present invention, the calculation formula in the above step S7 is shown in Formula (1):

[0020] ΔE = E2 - E1, Formula (1), where E1 is the conductivity in step S3 and E2 is the conductivity in step S6.

[0021] In some embodiments of the present invention, the evaluation criteria for surface hydration inhibition in the above step S7 are as follows: when ΔE (ms·cm-1) ≥ 0.5, the surface hydration inhibition is excellent; when 0.1 < ΔE (ms·cm-1) < 0.5, the surface hydration inhibition is good; when ΔE (ms·cm-1) ≤ 0.1, the surface hydration inhibition is poor.

[0022] In some embodiments of the present invention, when the volumes of the above sample injection tank, inhibition tank, and test tank are 500 mL, in step S1, 400 mL of drilling fluid or inhibitor aqueous solution is added to the sample injection tank. In step S2, when the liquid level in the inhibition tank reaches one-third of the tank body, specifically, when the liquid level in the inhibition tank reaches 150 mL. In step S4, the addition amount of montmorillonite is 3 g. In step S5, when the liquid level in the test tank reaches one-fifth of the tank body, specifically, when the liquid level in the test tank reaches 50 mL.

[0023] Through this method, the interaction between drilling fluid or inhibitor and substances such as montmorillonite in the formation during the actual drilling process can be simulated, providing a systematic and operable process for evaluating surface hydration inhibition. After the action of the inhibitor or drilling fluid on montmorillonite, the conductivity before and after the action is detected, and the inhibition effect of the drilling fluid or inhibitor is evaluated through the difference value. The inhibitor or drilling fluid needs to displace the cations in montmorillonite to achieve the inhibition effect. Therefore, when the conductivity difference before and after the action is greater than 0.5, it indicates that the number of cation displacements is large and the surface hydration inhibition is good. When the difference value is between 0.1 and 0.5, it indicates that the number of cation displacements is relatively large and the surface hydration inhibition is good. When the difference value is less than 0.1, it indicates that the number of cation displacements before and after the action is small, there is no obvious change, and the surface hydration inhibition is poor. It can quickly and accurately classify and judge the inhibition effect, and determine the dosage of the inhibitor according to the inhibition effect, providing a direct reference basis for actual engineering applications.

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

[0025] 1. Traditional evaluation methods for surface hydration inhibition usually require complex microscopic property tests (such as XRD, thermogravimetric analysis, etc.), which have a long cycle and cumbersome steps, resulting in a long test time. The present invention directly evaluates the inhibition effect through the conductivity difference, greatly shortening the evaluation process, making the test more efficient, saving time, and improving the application efficiency at the construction site.

[0026] 2. In the traditional method, the experimental steps are complex and time-consuming, requiring a large amount of materials and manpower support, which increases the overall cost. By reducing the experimental steps and time, the present invention can significantly save labor and material costs, while accelerating the inhibitor evaluation process and reducing the comprehensive cost at the construction site. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0028] Figure 1 FIG. is a schematic structural diagram of a rapid surface hydration inhibition evaluation device provided by the present application.

[0029] Reference numerals: 100 - gas supply device; 110 - first intake valve; 120 - second intake valve; 200 - sample injection tank; 210 - first drain valve; 220 - first exhaust valve; 300 - inhibition tank; 310 - second drain valve; 320 - second exhaust valve; 400 - test tank; 500 - conductivity probe; 600 - data acquisition instrument. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below. For those conditions not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. The reagents or instruments for which the manufacturers are not specified are all conventional products that can be obtained through commercial purchase.

[0031] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application will be described in detail below with reference to specific embodiments.

[0032] The features and performance of the present application will be further described in detail below in combination with the embodiments.

[0033] Embodiment 1

[0034] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of an embodiment of the present application.

[0035] The present application provides a rapid surface hydration inhibition evaluation device, which includes a sample injection tank 200, an inhibition tank 300, and a test tank 400. The sample injection tank 200 is communicated with the inhibition tank 300, and the inhibition tank 300 is also communicated with the test tank 400. There is a gas supply device 100, and the gas supply device 100 is communicated with both the sample injection tank 200 and the inhibition tank 300. Filter membranes are provided in both the sample injection tank 200 and the inhibition tank 300, and the two filter membranes are respectively located at the liquid outlet parts of the sample injection tank 200 and the inhibition tank 300. Conductivity probes 500 are provided in both the inhibition tank 300 and the test tank 400.

[0036] In order to meet the requirements of independent pressurization of the sample injection tank 200 and the inhibition tank 300 in the experiment, a first intake valve 110 is provided between the gas supply device 100 and the sample injection tank 200, and a second intake valve 120 is provided between the gas supply device 100 and the inhibition tank 300. The first intake valve 110 is provided to control the intake and pressurization into the sample injection tank 200, and the second intake valve 120 is provided to control the intake and pressurization into the inhibition tank 300, which can respectively control the pressurization processes into the sample injection tank 200 and the inhibition tank 300, ensure appropriate pressure conditions when the sample injection tank 200 drains liquid to the inhibition tank 300 and the inhibition tank 300 drains liquid to the test tank 400, guarantee the smooth transfer of the liquid, and enable the precise control of the pressure conditions during the experiment, improving the accuracy and repeatability of the experiment.

[0037] In order to meet the directional control of the liquid flow direction in the experiment, a first drain valve 210 is provided between the sample injection tank 200 and the inhibition tank 300, and a second drain valve 310 is provided between the inhibition tank 300 and the test tank 400. The first and second drain valves 310 are provided to control the flow of the liquid between the tanks by opening or closing, enabling the directional flow of the liquid to meet the experimental requirements.

[0038] In order to prevent potential safety hazards caused by opening the pressurized inhibition tank 300 when adding montmorillonite, a first exhaust valve 220 is provided on the sample injection tank 200, and a second exhaust valve 320 is provided on the inhibition tank 300. Since pressurization is required into the sample injection tank 200 and the inhibition tank 300 during the experiment, and the initial conductivity is tested, and montmorillonite needs to be put in and re-pressurized after the test is completed, the first exhaust valve 220 and the second exhaust valve 320 are required to prevent potential safety hazards caused by opening each tank under pressurized conditions.

[0039] In order to record the initial conductivity and the conductivity after the action, a data acquisition instrument 600 is further included. Both conductivity probes 500 are electrically connected to the data acquisition instrument 600, which is used to collect the data detected by the conductivity probes 500, can record the conductivity values of the samples at different stages in real time and accurately, avoid errors that may be generated by manual recording, improve the efficiency and accuracy of data acquisition, and facilitate subsequent analysis and processing of the data.

[0040] In order to allow the cation exchange reaction to proceed fully, stirrers are provided in both the above-mentioned sample injection tank 200 and the inhibition tank 300. The stirrers are used to stir the liquid. After adding substances (such as drilling fluid, inhibitor aqueous solution, montmorillonite, etc.), stirring can quickly and evenly mix the substances, ensuring the uniformity of the composition of the sample in each tank, making the reaction or measurement process more accurate and reliable, and helping to improve the accuracy and reliability of the experimental results.

[0041] In order to allow full cation replacement, the above-mentioned filter membrane is a nylon filter cloth. The mesh number of the nylon filter cloth is greater than 80,000 meshes (0.1 microns). The filter membrane in the sample injection tank 200 mainly separates the solid phase in the drilling fluid. The solid phase includes barite, bentonite, and plugging materials, and the particle sizes tested are all above 0.1 microns. Thus, the solid phase and the liquid phase can be effectively separated, and the conductivity of the liquid phase in the drilling fluid can be accurately measured. The filter membrane in the inhibition tank 300 mainly separates sodium montmorillonite and the liquid phase. The particle size of sodium montmorillonite after hydration and dispersion is also above 0.1 microns. Therefore, a nylon filter cloth with a mesh number greater than 80,000 is selected to effectively separate sodium montmorillonite and the filtrate after ion exchange, and the conductivity of the filtrate can be accurately measured.

[0042] During use, add the drilling fluid or inhibitor aqueous solution to be tested into the sample injection tank 200, and turn on the stirrer in the sample injection tank 200 for stirring. After the stirring is completed, open the first liquid discharge valve 210, close the second liquid discharge valve 310, the first air exhaust valve 220, and the second air exhaust valve 320, open the first air inlet valve 110, and pressurize the sample injection tank 200. After the solution is transferred to the inhibition tank 300, close the first liquid discharge valve 210. Use the conductivity probe 500 in the inhibition tank 300 to measure the conductivity, and then open the first air exhaust valve 220 and the second air exhaust valve 320 to exhaust and reduce the pressure. Add montmorillonite to the inhibition tank 300, turn on the stirrer in the inhibition tank 300 for stirring. After stirring, open the second liquid discharge valve 310, and open the second air inlet valve 120 to pressurize the inhibition tank 300. After the solution is transferred to the test tank 400, close the second liquid discharge valve 310. Use the conductivity probe 500 in the test tank 400 to measure the conductivity. Obtain the data of cation exchange by calculating the difference, and determine the inhibition of surface hydration based on this.

[0043] Example 2

[0044] This Example 2 provides a method for a rapid surface hydration inhibition evaluation device, including the following steps:

[0045] S1. Select a sampling tank 200, an inhibition tank 300, and a test tank 400 with a tank volume of 500 mL. Add 400 mL of drilling fluid to the sampling tank 200. 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, and turn on the stirrer in the sampling tank 200 and stir for 20 min.

[0046] S2. Open the first drain valve 210, close the second drain valve 310, the first exhaust valve 220, and the second exhaust valve 320. Open the first intake valve 110 and pressurize the sampling tank 200 to 1.5 MPa. After the liquid volume in the inhibition tank 300 reaches 150 mL, close the first drain valve 210.

[0047] S3. Use the conductivity probe 500 in the inhibition tank 300 to measure the conductivity E1 as 3.0 S / m.

[0048] S4. Open the first exhaust valve 220 and the second exhaust valve 320, add 3 g of montmorillonite to the inhibition tank 300, and turn on the stirrer in the inhibition tank 300 and stir for 1 h.

[0049] S5. Open the second drain valve 310 and open the second intake valve 120. Pressurize the inhibition tank 300 to 1.5 MPa. After the liquid volume in the test tank 400 reaches 50 mL, close the second drain valve 310.

[0050] S6. Use the conductivity probe 500 in the test tank 400 to measure the conductivity E2 as 3.5 S / m.

[0051] S7. Calculate the conductivity difference through Equation (1). The formula is: ΔE = E2 - E1 Equation (1), and obtain the inhibition effect through the surface hydration inhibition evaluation standard. The evaluation method is shown in Table 1:

[0052] Table 1

[0053] <![CDATA[ΔE(ms·cm -1 )]]> Inhibitory ΔE≥0.5 Excellent inhibitory effect 0.1<ΔE<0.5 Good inhibitory effect ΔE≤0.1 Poor inhibitory effect

[0054] In this embodiment, the value of ΔE is 0.5. Referring to Table 1, it is concluded that the inhibition of the drilling fluid of the potassium-based polysulfonate drilling fluid system is excellent.

[0055] Comparative Example 1

[0056] 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:

[0057] Evaluate the surface hydration inhibition of the drilling fluid using XRD, X-ray diffraction method.

[0058] In material analysis and research work, XRD has a wide range of applications. With XRD, the swelling properties of clay minerals under certain water content conditions can be further studied. The data measured by X-ray diffraction is used to calculate the basal spacing d001 of clay minerals through the Bragg equation (2d001*sinθ = nλ). The experimental conditions are as follows: Cu target, Kα ray, the accelerating voltage and current are 40 kV and 40 mA respectively, the scanning step size is 0.0167° / step, the dwell time is 12 s, about 0.1° / min, and the diffraction angle is 3° ≤ 2θ ≤ 40°.

[0059] After the experiment, the measured basal spacing is 1.30 nm, and the results show that the potassium-based polysulfonate drilling fluid system has good inhibition performance.

[0060] According to the results, it can be seen that the drilling fluid inhibition performance of the potassium-based polysulfonate drilling fluid system in Comparative Example 1 is good, which is consistent with the results in Example 2, proving the feasibility and accuracy of the evaluation method in Example 2. However, the XRD basal spacing is affected by the solid phase components in the drilling fluid, and it is necessary to separate the solid phase components from sodium montmorillonite before detection. The separation steps are cumbersome, time-consuming, and it is difficult to completely separate. Therefore, the solution of this application optimizes the experimental steps and reduces the evaluation time while ensuring the same result accuracy and reliability, making it more suitable for on-site construction applications and improving construction efficiency.

[0061] Example 3

[0062] This Example 3 provides a method for evaluating the rapid surface hydration inhibition performance, including the following steps:

[0063] S1. Select a sampling tank 200, an inhibition tank 300, and a test tank 400 with a tank volume of 500 mL. Add 400 mL of drilling fluid to the sampling tank 200. 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, and turn on the stirrer in the sampling tank 200 to stir for 20 min.

[0064] S2. Open the first drain valve 210, close the second drain valve 310, the first exhaust valve 220, and the second exhaust valve 320. Open the first intake valve 110, pressurize the sampling tank 200 to 1.5 MPa. After the liquid volume in the inhibition tank 300 reaches 150 mL, close the first drain valve 210.

[0065] S3. Use the conductivity probe 500 in the inhibition tank 300 to measure the conductivity E1 as 2.5 S / m.

[0066] S4. Open the first exhaust valve 220 and the second exhaust valve 320, add 3 g of montmorillonite into the inhibition tank 300, and turn on the stirrer in the inhibition tank 300 to stir for 1 h.

[0067] S5. Open the second drain valve 310 and the second intake valve 120, pressurize the inhibition tank 300 to 1.5 MPa. After the liquid volume in the test tank 400 reaches 50 mL, close the second drain valve 310.

[0068] S6. Use the conductivity probe 500 in the test tank 400 to measure the conductivity E2 as 2.2 S / m.

[0069] S7. Calculate the conductivity difference through Equation (1). The formula is: ΔE = E2 - E1 Equation (1), and obtain the inhibition effect through the surface hydration inhibition evaluation criteria. The evaluation method is shown in Table 1:

[0070] Table 1

[0071] <![CDATA[ΔE(ms·cm -1 )]]> Inhibitory ΔE≥0.5 Excellent inhibitory effect 0.1<ΔE<0.5 Good inhibitory effect ΔE≤0.1 Poor inhibitory effect

[0072] In this embodiment, the value of ΔE is 0.3. Referring to Table 1, the inhibition of the polymer drilling fluid system is good.

[0073] Comparative Example 2

[0074] In this Comparative Example 2, the inhibition of the drilling fluid of the polymer drilling fluid system is evaluated by using the conventional method in the prior art. The specific method is to use the rolling recovery test.

[0075] In this experiment, the rolling recovery rate (120 °C, 16 h) of the polymer drilling fluid system on the shale is used as the evaluation index. The specific test steps are as follows:

[0076] (1) Sieved the collected drill cuttings with a double-layer split sample 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.

[0077] (2) Take 50.0 g (accurate to 0.1 g) of the prepared drill cuttings, put them into a high-temperature tank filled with 350 mL of evaluation liquid, and tighten the lid.

[0078] (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.

[0079] (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 split sample sieve with a hole side length of 0.42 mm, and wet sieve wash in a water tank filled with tap water for 1.0 min.

[0080] (5) Place the sieved rock samples in a forced-air constant-temperature drying oven at 105°C ± 3°C and dry for 4 h. Take them out, cool, and leave them standing in air for 24 h, then weigh (accurate to 0.1 g) and calculate the primary rolling recovery rate (R).

[0081] 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.

[0082] Comparative Example 3

[0083] This Comparative Example 3 is basically the same as Comparative Example 1. The difference is that the drilling fluid system is a polymer drilling fluid system. After the experiment, the measured base spacing is 1.63 nm, indicating that the surface hydration ability of the polymer drilling fluid system is average, which is consistent with the results of Example 3 and inconsistent with the rolling recovery experiment results in Comparative Example 2. This is because during the clay hydration process, after the clay absorbs water, the crystal layers first expand, and when the expansion reaches a certain extent, dispersion occurs. The rolling recovery rate mainly evaluates the dispersion ability. However, when the clay absorbs water and expands 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. Therefore, combining Example 3, Comparative Example 2, and Comparative Example 3, it can be concluded that the evaluation results of rolling recovery are inaccurate, the technical solution of this application has accurate results, and the evaluation time is shorter.

[0084] Example 4

[0085] This Example 4 provides a method for quickly evaluating the surface hydration inhibition of a device, including the following steps:

[0086] S1. Select a sampling tank 200, an inhibition tank 300, and a test tank 400 with a tank volume of 500 mL. Add 400 mL of drilling fluid to the sampling tank 200. The drilling fluid is a common high-clay drilling fluid, which is composed of 10% bentonite + 0.2% sodium hydroxide + 0.1% xanthan gum, and turn on the stirrer in the sampling tank 200 to stir for 20 min.

[0087] S2. Open the first drain valve 210, close the second drain valve 310, the first exhaust valve 220, and the second exhaust valve 320. Open the first intake valve 110 and pressurize the sampling tank 200 to 1.5 MPa. After the liquid volume in the inhibition tank 300 reaches 150 mL, close the first drain valve 210.

[0088] S3. Use the conductivity probe 500 in the inhibition tank 300 to measure the conductivity E1 as 3.04 S / m.

[0089] S4. Open the first exhaust valve 220 and the second exhaust valve 320, add 3 g of montmorillonite to the inhibition tank 300, and turn on the stirrer in the inhibition tank 300 to stir for 1 h.

[0090] S5. Open the second drain valve 310 and the second intake valve 120, pressurize the inhibition tank 300 to 1.5 MPa. After the liquid volume in the test tank 400 reaches 50 mL, close the second drain valve 310.

[0091] S6. Use the conductivity probe 500 in the test tank 400 to measure the conductivity E2 as 3.1 S / m.

[0092] S7. Calculate the conductivity difference through Equation (1). The formula is: ΔE = E2 - E1 Equation (1), and obtain the inhibition effect through the surface hydration inhibition evaluation criteria. The evaluation method is shown in Table 1:

[0093] Table 1

[0094] <![CDATA[ΔE(ms·cm -1 )]]> Inhibitory ΔE≥0.5 Excellent inhibitory effect 0.1<ΔE<0.5 Good inhibitory effect ΔE≤0.1 Poor inhibitory effect

[0095] In this embodiment, the value of ΔE is 0.06. Referring to Table 1, it is concluded that the inhibition of the polymer drilling fluid system is poor.

[0096] Comparative Example 4

[0097] This Comparative Example 4 is basically the same as Comparative Example 1. The difference is that the drilling fluid system is a common high-clay drilling fluid. After the experiment, the basal spacing is measured to be 1.83 nm, indicating that the inhibition of the common high-clay drilling fluid system is poor, which is consistent with the results in Example 4, further proving the feasibility and accuracy of the evaluation method in Example 4. However, the XRD basal spacing is affected by the solid phase components in the drilling fluid, and it is necessary to separate the solid phase components and sodium montmorillonite before detection. The separation steps are cumbersome, time-consuming, and it is difficult to completely separate. Therefore, the solution of this application optimizes the experimental steps and reduces the evaluation time while ensuring the same result accuracy and reliability, and is more suitable for on-site construction applications, improving construction efficiency.

[0098] The embodiments described above are some, but not all, of the 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. A rapid surface hydration inhibition evaluation device, characterized in that: include: The device body comprises a sampling tank, a suppression tank and a test tank, the sampling tank is connected to the suppression tank, and the suppression tank is also connected to the test tank; An air supply device, wherein the air supply device is connected to the sample injection tank and the suppression tank; A filter membrane is provided in the sample inlet tank and the suppression tank, and the two filter membranes are respectively located at the liquid outlet of the sample inlet tank and the liquid outlet of the suppression tank; Conductivity probes are arranged in the suppression tank and the test tank.

2. A rapid surface hydration inhibition evaluation device according to claim 1, characterized in that: A first air inlet valve is provided between the air supply device and the sample injection tank, and a second air inlet valve is provided between the air supply device and the suppression tank.

3. A rapid surface hydration inhibition evaluation device according to claim 1, characterized in that: A first liquid discharge valve is provided between the sample injection tank and the suppression tank, and a second liquid discharge valve is provided between the suppression tank and the test tank.

4. A rapid surface hydration inhibition evaluation device according to claim 1, characterized in that: The injection tank is provided with a first exhaust valve, and the suppression tank is provided with a second exhaust valve.

5. A rapid surface hydration inhibition evaluation device according to claim 1, characterized in that: It also includes a data acquisition instrument, and the two conductivity probes are both electrically connected to the data acquisition instrument.

6. A rapid surface hydration inhibition evaluation device according to claim 1, characterized in that: Agitators are provided in the sample injection tank and the suppression tank.

7. A rapid surface hydration inhibition evaluation device according to claim 1, characterized in that: The filter membrane is a nylon filter cloth, and the mesh number of the nylon filter cloth is greater than 80,000 meshes (0.1 micron).

8. An evaluation method based on the rapid surface hydration inhibition evaluation device according to any one of claims 1 to 7, characterized in that: The following steps are involved: S1, adding drilling fluid or inhibitor aqueous solution into the sample injection tank, and turning on the agitator in the sample injection tank to stir for 20 minutes; S2, open the first liquid discharge valve, close the second liquid discharge valve, the first exhaust valve and the second exhaust valve, open the first air intake valve, pressurize the injection tank to 1-2 MPa, and close the first liquid discharge valve when the liquid volume of the inhibition tank reaches one third of the tank body; S3, testing conductivity using a conductivity probe in the suppression tank; S4, opening the first exhaust valve and the second exhaust valve, adding montmorillonite into the suppression tank, turning on the agitator in the suppression tank and stirring for 1 hour; S5, open the second drain valve and the second air inlet valve, pressurize the suppression tank to 1-2 MPa, and close the second drain valve when the liquid level in the test tank reaches one fifth of the tank body; S6. Testing the conductivity using the conductivity probe in the test tank; S7, calculating the difference between the conductivity of step S3 and step S6, and obtaining the inhibitory effect according to the surface hydration inhibitory evaluation standard.

9. The method according to claim 8, characterized in that The calculation formula in step S7 is shown in formula (1): ΔE=E2-E1 (1), where E1 is the conductivity in step S3, and E2 is the conductivity in step S6.

10. The method according to claim 8, characterized in that The evaluation standard of surface hydration inhibition in step S7 is: when ΔE (ms·cm-1) ≥ 0.5, the surface hydration inhibition is excellent; when 0.1 < ΔE (ms·cm-1) < 0.5, the surface hydration inhibition is good; when ΔE (ms·cm-1) ≤ 0.1, the surface hydration inhibition is poor.

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