An experimental device and method based on formation water mineralization and resistivity conversion

Abstract

The present invention discloses an experimental device and method based on formation water mineralization and resistivity conversion, wherein the experimental device comprises an iron stand, an open water tank, a digital bridge, a copper sheet and a burette; the iron stand is fixedly arranged above the open water tank; the outer wall of the open water tank is connected to the digital bridge through a copper sheet; the burette is fixedly arranged on the iron rod of the iron stand; and a scale line is fixedly arranged on the outer wall of the open water tank. The experimental device of the present invention has low cost and is easy to promote. At the same time, it is simple to operate, and can reduce the error caused by inaccurate operation during the measurement process. The experimental method of the present invention measures the resistance through a digital bridge, and then uses a mineralization-resistivity conversion plate to read the resistivity, and the phenomenon is intuitive; the relationship between the resistivity, mineralization and electrode system coefficient and the similarities and differences between the pure theoretical formula can be analyzed.

Description

Technical Field

[0001] The invention belongs to the technical field of formation water experiments, and in particular relates to an experimental device and method based on formation water salinity and resistivity conversion. Background Art

[0002] In the petroleum industry, the conductivity of the formation is mainly used to determine the oil and gas content of the formation. The formation will contain formation water to a greater or lesser extent. The conductivity of formation water has a great contribution to the conductivity of the formation. Therefore, the conductivity of formation water plays a vital role in determining the fluid properties in the reservoir in the petroleum industry. Studies have shown that the conductivity of formation water is mainly affected by the type of formation water (i.e., the main type of ions contained in the formation water), salinity (i.e., ion concentration) and temperature. The size of the formation water resistivity depends on the mineral composition and salinity of the formation water. Different mineral compositions lead to different conductive properties. Different minerals with the same content have different conductivity, thus different formation water resistivity. Generally speaking, the resistivity of formation water decreases with the increase of salinity. The higher the salinity, the stronger the conductivity. The existing technology simulates formation water under laboratory conditions to study the relationship between formation water salinity and resistivity and electrode system coefficient. It is usually complicated to operate, has many uncertain factors, large amount of calculation, and is greatly different from the actual value. Summary of the invention

[0003] The purpose of the present invention is to solve the problem of formation water mineralization and resistivity conversion, and proposes an experimental device and method based on formation water mineralization and resistivity conversion.

[0004] The technical solution of the present invention is: an experimental device based on formation water mineralization and resistivity conversion comprises an iron frame, an open water tank, a digital bridge, a copper sheet and a burette;

[0005] The iron frame is fixedly arranged above the open water tank; the outer wall of the open water tank is connected to the digital bridge through a copper sheet; the burette is fixedly arranged on the iron rod of the iron frame; and the outer wall of the open water tank is fixedly arranged with a scale line;

[0006] The iron stand is used to fix the burette; the open water tank is used to hold pure water; the digital bridge is used to measure the resistance value; the burette is used to hold different types of saturated solutions.

[0007] The beneficial effects of the present invention are: the experimental device of the present invention has low cost and is easy to promote. At the same time, the operation is simple and the error caused by inaccurate operation during the measurement process can be reduced.

[0008] Based on the above system, the present invention also proposes an experimental method based on formation water salinity and resistivity conversion, comprising the following steps:

[0009] S1: Pour 0.8L of pure water into the open water tank;

[0010] S2: Prepare sodium chloride solution, magnesium chloride solution and magnesium sulfate solution with a concentration of 30000 mg / L respectively, and put them into three burettes respectively;

[0011] S3: Repeatedly drip sodium chloride solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the fixed electrode system coefficient and the resistance of the experimental device K1 = F (r1);

[0012] S4: Repeatedly drip magnesium chloride solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization degree and resistivity of the two mixed salts K1 = F·G (k x2 );

[0013] S5: Repeatedly drip magnesium sulfate solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization degree and resistivity of the three mixed salts K1 = F·G (k x3 ).

[0014] The beneficial effects of the present invention are as follows: the experimental method of the present invention measures the resistance by a digital bridge, and then uses a mineralization-resistivity conversion plate to read the resistivity, and the phenomenon is intuitive; the relationship between the resistivity, mineralization and electrode system coefficient and the similarities and differences between the pure theoretical formula can be analyzed.

[0015] Furthermore, step S3 includes the following sub-steps:

[0016] S31: dripping sodium chloride solution into the open water tank through a burette, reading a first resistance value r1 using a digital bridge, and calculating a first theoretical resistivity R1;

[0017] S32: dripping sodium chloride solution into the open water tank again through the burette, reading the second resistance value r2 using the digital bridge, and calculating the second theoretical resistivity R2;

[0018] S33: Repeat step S32 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the fixed electrode system coefficient of the experimental device and the resistance K1=F(r1), where K1 represents the fixed electrode system coefficient of the experimental device, r1 represents the resistance of a single salt, and F(·) represents the relationship function.

[0019] The beneficial effect of the above further scheme is that in the present invention, as long as the volume of the liquid in the open water tank remains unchanged and the device remains unchanged, the electrode system coefficient can be determined by the resistance value and the resistivity. After this experimental link, as long as the volume of the solution remains unchanged, the resistance value r can be measured by the bridge, and it can be multiplied by the electrode system coefficient to obtain the resistivity value.

[0020] Further, step S31 includes the following sub-steps:

[0021] S311: Take out 10 ml of pure water from the open water tank using a syringe;

[0022] S312: Using a burette, drip 10 ml of sodium chloride solution into the open water tank to allow it to diffuse;

[0023] S313: Reading the first resistance value r1 using a digital bridge;

[0024] S314: Calculate the first mineralization degree k1 of the solution at this time according to the first resistance value r1, and the calculation formula is:

[0025]

[0026] Wherein, V1 represents the volume of pure water taken out this time, C1 represents the concentration of sodium chloride solution, and V represents the volume of pure water;

[0027] S315: According to the room temperature and the first salinity k1 of the solution at this time, a first theoretical resistivity R1 of the solution at this time is obtained using a salinity-resistivity conversion chart.

[0028] The beneficial effect of the above further scheme is that in the present invention, 10 ml of pure water is taken out from the open water tank using a syringe, and then a sodium chloride solution is injected into the container using a burette to keep the volume in the container constant, otherwise the electrode system coefficient will change, thereby ensuring the accuracy of the data of the entire experimental process and obtaining the relationship between the electrode system coefficient and the resistance of a single salt.

[0029] Further, step S32 includes the following sub-steps:

[0030] S321: Use a syringe to take out 10 ml of solution from the open water tank;

[0031] S322: Using a burette, drip 10 ml of sodium chloride solution into the open water tank to allow it to diffuse;

[0032] S323: Read the second resistance value r2 using a digital bridge;

[0033] S324: Calculate the second mineralization degree k2 of the solution at this time according to the second resistance value r2, and the calculation formula is:

[0034]

[0035] Where V2 represents the volume of the solution taken out this time, C1 represents the concentration of the sodium chloride solution, V represents the volume of pure water, C x Indicates the salt concentration of the solution in the water tank before the solution is extracted;

[0036] S325: According to the room temperature and the second mineralization k2 of the solution at this time, a second theoretical resistivity R2 of the solution at this time is obtained using a mineralization-resistivity conversion chart.

[0037] Furthermore, step S4 includes the following sub-steps:

[0038] S41: Take out 10 ml of solution from the open water tank using a syringe;

[0039] S42: Using a burette, drip 10 ml of magnesium chloride solution into the open water tank to allow it to diffuse;

[0040] S43: Reading a third resistance value r3 using a digital bridge;

[0041] S44: Calculate the third mineralization k3 of the solution at this time according to the third resistance value r3, and the calculation formula is:

[0042]

[0043] Where V3 represents the volume of the solution taken out this time, C2 represents the concentration of the magnesium chloride solution, V represents the volume of pure water, C x Indicates the salt concentration of the solution in the water tank before the solution is extracted;

[0044] S45: Repeat step S44 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the mineralization degree and resistivity of the two mixed salts K1 = F·G (k x2 ), where K1 represents the fixed electrode system coefficient of the experimental device, G(k x2 ) represents the resistance of the two mixed salts, k x2 It represents the mineralization of two mixed salts, and F represents the relationship function.

[0045] The beneficial effect of the above further scheme is that in the present invention, 10 ml of solution is taken out from the open water tank using a syringe, and then the magnesium chloride solution is injected into the container using a burette to keep the volume in the container constant, otherwise the electrode system coefficient will change, thereby ensuring the accuracy of the data of the entire experimental process and obtaining the relationship between the mineralization and resistivity of the two mixed salts.

[0046] Furthermore, step S5 includes the following sub-steps:

[0047] S51: Take out 10 ml of solution from the open water tank using a syringe;

[0048] S52: Using a burette, drip 10 ml of magnesium sulfate solution into the open water tank to allow it to diffuse;

[0049] S53: Reading the fourth resistance value r4 using a digital bridge;

[0050] S54: Calculate the fourth mineralization k4 of the solution at this time according to the fourth resistance value r4, and the calculation formula is:

[0051]

[0052] Wherein, V4 represents the volume of the solution taken out this time, C3 represents the concentration of the magnesium sulfate solution, V represents the volume of pure water, C x Indicates the salt concentration of the solution in the water tank before the solution is extracted;

[0053] S55: Repeat step S54 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the mineralization degree and resistivity of the three mixed salts K1 = F·G (k x3 ), where K1 represents the fixed electrode system coefficient of the experimental device, G(k x3 ) represents the resistance of the three mixed salts, k x3 It represents the mineralization of three mixed salts, and F represents the relationship function.

[0054] The beneficial effect of the above further scheme is that in the present invention, 10 ml of solution is taken out from the open water tank using a syringe, and then the magnesium sulfate solution is injected into the container using a burette to keep the volume in the container constant, otherwise the electrode system coefficient will change, thereby ensuring the accuracy of the data of the entire experimental process and obtaining the relationship between the mineralization and resistivity of the three mixed salts. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] Figure 1 This is the structural diagram of the experimental device;

[0056] Figure 2 Flow chart of the experimental method;

[0057] Figure 3 It is the mineralization-resistivity conversion chart;

[0058] Figure 4 It is the mineralization-resistivity conversion chart of different ions;

[0059] Figure 5 This is the experimental data graph of NaCl;

[0060] In the picture, 1. Iron stand; 2. Open water tank; 3. Digital bridge; 4. Copper sheet; 5. Burette. DETAILED DESCRIPTION

[0061] The embodiments of the present invention will be further described below in conjunction with the accompanying drawings.

[0062] Before describing the specific embodiments of the present invention, in order to make the scheme of the present invention clearer and more complete, the abbreviations and key terms used in the present invention are first defined as follows:

[0063] Mineralization: refers to the amount of a certain ion contained in a unit volume of solution, generally expressed in mg / L.

[0064] Resistivity: A physical quantity that characterizes the electrical conductivity of a substance, measured in ohm-meters. Generally speaking, the higher the mineralization of various salt solutions, the better their electrical conductivity.

[0065] like Figure 1 As shown, the present invention provides an experimental device based on formation water mineralization and resistivity conversion, including an iron frame 1, an open water tank 2, a digital bridge 3, a copper sheet 4 and a burette 5;

[0066] The iron frame 1 is fixedly arranged above the open water tank 2; the outer wall of the open water tank 2 is connected to the digital bridge 3 through the copper sheet 4; the burette 5 is fixedly arranged on the iron rod of the iron frame 1; and the outer wall of the open water tank 2 is fixedly provided with scale lines;

[0067] The iron frame 1 is used to fix the burette 5; the open water tank 2 is used to contain pure water; the digital bridge 3 is used to measure the resistance value; and the burette 5 is used to contain different types of saturated solutions.

[0068] Based on the above system, the present invention also proposes an experimental method based on the conversion of formation water salinity and resistivity, such as Figure 2 As shown, the following steps are included:

[0069] S1: Pour 0.8L of pure water into the open water tank;

[0070] S2: Prepare sodium chloride solution, magnesium chloride solution and magnesium sulfate solution with a concentration of 30000 mg / L respectively, and put them into three burettes respectively;

[0071] S3: Repeatedly drip sodium chloride solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the fixed electrode system coefficient and the resistance of the experimental device K1 = F (r1);

[0072] S4: Repeatedly drip magnesium chloride solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization degree and resistivity of the two mixed salts K1 = F·G (k x2 );

[0073] S5: Repeatedly drip magnesium sulfate solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization degree and resistivity of the three mixed salts K1 = F·G (k x3).

[0074] In the embodiment of the present invention, Figure 2 As shown, step S3 includes the following sub-steps:

[0075] S31: dripping sodium chloride solution into the open water tank through a burette, reading a first resistance value r1 using a digital bridge, and calculating a first theoretical resistivity R1;

[0076] S32: dripping sodium chloride solution into the open water tank again through the burette, reading the second resistance value r2 using the digital bridge, and calculating the second theoretical resistivity R2;

[0077] S33: Repeat step S32 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the fixed electrode system coefficient of the experimental device and the resistance K1=F(r1), where K1 represents the fixed electrode system coefficient of the experimental device, r1 represents the resistance of a single salt, and F(·) represents the relationship function.

[0078] In the present invention, as long as the volume of the liquid in the open water tank remains unchanged and the device remains unchanged, the electrode system coefficient can be determined by the resistance value and the resistivity. After this experimental link, as long as the volume of the solution remains unchanged, the resistance value r can be measured by the bridge, and it can be multiplied by the electrode system coefficient to obtain the resistivity value.

[0079] In the embodiment of the present invention, Figure 2 As shown, step S31 includes the following sub-steps:

[0080] S311: Take out 10 ml of pure water from the open water tank using a syringe;

[0081] S312: Using a burette, drip 10 ml of sodium chloride solution into the open water tank to allow it to diffuse;

[0082] S313: Reading the first resistance value r1 using a digital bridge;

[0083] S314: Calculate the first mineralization degree k1 of the solution at this time according to the first resistance value r1, and the calculation formula is:

[0084]

[0085] Wherein, V1 represents the volume of pure water taken out this time, C1 represents the concentration of sodium chloride solution, and V represents the volume of pure water;

[0086] S315: According to the room temperature and the first salinity k1 of the solution at this time, a first theoretical resistivity R1 of the solution at this time is obtained using a salinity-resistivity conversion chart.

[0087] In the present invention, 10 ml of pure water is taken out from the open water tank using a syringe, and then a sodium chloride solution is injected into the container using a burette to keep the volume in the container constant, otherwise the electrode system coefficient will change, thereby ensuring the accuracy of the data of the entire experimental process and obtaining the relationship between the electrode system coefficient of a single salt and the resistance.

[0088] In the embodiment of the present invention, Figure 2 As shown, step S32 includes the following sub-steps:

[0089] S321: Use a syringe to take out 10 ml of solution from the open water tank;

[0090] S322: Using a burette, drip 10 ml of sodium chloride solution into the open water tank to allow it to diffuse;

[0091] S323: Read the second resistance value r2 using a digital bridge;

[0092] S324: Calculate the second mineralization degree k2 of the solution at this time according to the second resistance value r2, and the calculation formula is:

[0093]

[0094] Where V2 represents the volume of the solution taken out this time, C1 represents the concentration of the sodium chloride solution, V represents the volume of pure water, C x Indicates the salt concentration of the solution in the water tank before the solution is extracted;

[0095] S325: According to the room temperature and the second mineralization k2 of the solution at this time, a second theoretical resistivity R2 of the solution at this time is obtained using a mineralization-resistivity conversion chart.

[0096] In the embodiment of the present invention, Figure 2 As shown, step S4 includes the following sub-steps:

[0097] S41: Take out 10 ml of solution from the open water tank using a syringe;

[0098] S42: Using a burette, drip 10 ml of magnesium chloride solution into the open water tank to allow it to diffuse;

[0099] S43: Reading a third resistance value r3 using a digital bridge;

[0100] S44: Calculate the third mineralization k3 of the solution at this time according to the third resistance value r3, and the calculation formula is:

[0101]

[0102] Where V3 represents the volume of the solution taken out this time, C2 represents the concentration of the magnesium chloride solution, V represents the volume of pure water, Cx Indicates the salt concentration of the solution in the water tank before the solution is extracted;

[0103] S45: Repeat step S44 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the mineralization degree and resistivity of the two mixed salts K1 = F·G (k x2 ), where K1 represents the fixed electrode system coefficient of the experimental device, G(k x2 ) represents the resistance of the two mixed salts, k x2 It represents the mineralization of two mixed salts, and F represents the relationship function.

[0104] In the present invention, 10 ml of solution is taken out from the open water tank using a syringe, and then the magnesium chloride solution is injected into the container using a burette to keep the volume in the container constant, otherwise the electrode system coefficient will change, thereby ensuring the accuracy of the data of the entire experimental process and obtaining the relationship between the mineralization and resistivity of the two mixed salts.

[0105] In the embodiment of the present invention, Figure 2 As shown, step S5 includes the following sub-steps:

[0106] S51: Take out 10 ml of solution from the open water tank using a syringe;

[0107] S52: Using a burette, drip 10 ml of magnesium sulfate solution into the open water tank to allow it to diffuse;

[0108] S53: Reading the fourth resistance value r4 using a digital bridge;

[0109] S54: Calculate the fourth mineralization k4 of the solution at this time according to the fourth resistance value r4, and the calculation formula is:

[0110]

[0111] Wherein, V4 represents the volume of the solution taken out this time, C3 represents the concentration of the magnesium sulfate solution, V represents the volume of pure water, C x Indicates the salt concentration of the solution in the water tank before the solution is extracted;

[0112] S55: Repeat step S54 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the mineralization degree and resistivity of the three mixed salts K1 = F·G (k x3 ), where K1 represents the fixed electrode system coefficient of the experimental device, G(k x3 ) represents the resistance of the three mixed salts, k x3 It represents the mineralization of three mixed salts, and F represents the relationship function.

[0113] In the present invention, 10 ml of solution is taken out from the open water tank using a syringe, and then the magnesium sulfate solution is injected into the container using a burette to keep the volume in the container constant, otherwise the electrode system coefficient will change, thereby ensuring the accuracy of the data of the entire experimental process and obtaining the relationship between the mineralization and resistivity of the three mixed salts.

[0114] like Figure 3 As shown, it is a mineralization-resistivity conversion chart, which is a relationship diagram between the resistivity and temperature of the existing NaCl solution.

[0115] like Figure 4 As shown in the figure, it is a coefficient comparison chart for converting other ion concentrations into resistivity, so it is called a conversion coefficient, and the sodium ion (chloride ion) is 1 as the benchmark.

[0116] When using the device of the present invention to conduct experiments, a sodium chloride solution of known concentration is first dripped into the open water tank, and the resistance value is read using a bridge. Figure 3 The graph shown can be used to obtain the theoretical resistivity value of the solution at this time, and then the resistivity value / resistance value can be used to obtain the electrode system coefficient. When the volume of the entire container remains unchanged and the device remains unchanged, the electrode system coefficient will remain unchanged. In subsequent experiments, you only need to read the resistance value displayed by the bridge and multiply it by the electrode system coefficient to obtain the resistivity value of the solution. After determining the electrode system coefficient, different types of ions can be added to conduct experiments, and the resistance value can be measured using the bridge. Multiply it by the electrode system coefficient to obtain the resistivity value. Figure 4 By comparing with the known empirical control chart, it can be determined whether there are omissions in the known control chart. Through this experimental device and its operation, it can effectively improve Figure 4 The accuracy of the conversion coefficients of various ions in the analysis can make them more regular and enrich the types of ions.

[0117] It should be noted that, in the experimental device of the present invention, the number of burettes 5 is 3, and in actual operation, the number of burettes can be increased according to actual needs, so as to realize the conversion between the mineralization and resistivity of various salt formation waters; and the whole method process is universal.

[0118] In the embodiment of the present invention, the single salt is NaCl, and the temperature is 20°. The specific relationship between its resistance, resistivity, k, solution, mineralization and resistivity is shown in Table 1. The average value of k is 0.016031733. Figure 5 As shown, Figure 5 (a) is a schematic diagram of reading graph k, Figure 5 (b) is the relationship between resistance and resistivity. Figure 5 (c) is the relationship between resistance and mineralization. Figure 5(a) is the relationship between mineralization and resistivity.

[0119] Table 1

[0120] resistance Resistivity resistance k Solution (ml) Mineralization(mg / L) Resistivity 955.4 955.4 10 300 575.27 8.6 575.27 0.014949502 20 597 8.6 385.69 6.3 385.69 0.016334362 30 891.03 6.3 305.41 4.8 305.41 0.015716578 40 1182.1197 4.8 251.8 3.86 251.8 0.015329627 50 1470.2985 3.86 212.85 3.28 212.85 0.015409913 60 1755.5955 3.28 196.27 2.8158 196.27 0.014346563 70 2038.0396 2.8158 166.38 2.5647 166.38 0.015414713 80 2317.6592 2.5647 144.55 2.3248 144.55 0.016083016 90 2594.4826 2.3248 129.37 2.1056 129.37 0.016275798 100 2868.5377 2.1056 117.03 1.93745 117.03 0.016555157 110 3139.8524 1.93745 108.98 1.8164 108.98 0.016667278 120 3408.4538 1.8164 100.23 1.6967 100.23 0.016928065 130 3674.3693 1.6967 94.24 1.57835 94.24 0.016748196 140 3937.6256 1.57835 88.64 1.4906 88.64 0.016816336 150 4198.2494 1.4906

[0121] The working principle and process of the present invention are as follows: the iron frame 1 is used to fix the burette 5; the open water tank 2 is used to hold pure water; the digital bridge 3 is used to measure the resistance value; the burette 5 is used to hold different types of salt solutions. The experimental device of the present invention prepares a solution with a known mineralization, uses a digital bridge to measure the resistance under the condition of known external temperature, reads the resistivity value of the mineralization solution corresponding to the mineralization-resistivity conversion plate, and thus obtains the electrode system coefficient. This experiment can accurately prepare a solution with a certain mineralization and accurately read the resistivity of the solution, so that the electrode system coefficient can be accurately obtained in the experiment. In this experiment, the relationship between the electrode system coefficient and the resistivity can be found and analyzed, and the pure theoretical formula of the electrode system coefficient and the resistivity can be compared with the actually measured resistivity and the electrode system coefficient to find the difference and connection between the two.

[0122] The beneficial effects of the present invention are:

[0123] (1) The experimental device of the present invention has low cost and is easy to promote. It is also simple to operate and can reduce the error caused by inaccurate operation during the measurement process.

[0124] (2) The experimental method of the present invention measures the resistance through a digital bridge and then uses a mineralization-resistivity conversion plate to read the resistivity. The phenomenon is intuitive and the relationship between resistivity, mineralization and electrode system coefficient can be analyzed to obtain the similarities and differences between the pure theoretical formula.

[0125] Those skilled in the art will appreciate that the embodiments described herein are intended to help readers understand the principles of the present invention, and should be understood that the protection scope of the present invention is not limited to such specific statements and embodiments. Those skilled in the art can make various other specific variations and combinations that do not deviate from the essence of the present invention based on the technical revelations disclosed by the present invention, and these variations and combinations are still within the protection scope of the present invention.

Claims

1. An experimental device based on formation water mineralization and resistivity conversion, characterized in that: It comprises an iron frame (1), an open water tank (2), a digital bridge (3), a copper sheet (4) and a burette (5); The iron frame (1) is fixedly arranged above the open water tank (2); the outer wall of the open water tank (2) is connected to the digital bridge (3) via a copper sheet (4); the burette (5) is fixedly arranged on the iron rod of the iron frame (1); and scale lines are fixedly arranged on the outer wall of the open water tank (2); The iron frame (1) is used to fix the burette (5); the open water tank (2) is used to contain pure water; the digital bridge (3) is used to measure the resistance value; the burette (5) is used to contain different types of saturated solutions, and the experimental method is as follows: A1: Pour 0.8L of pure water into the open water tank; A2: Prepare sodium chloride solution, magnesium chloride solution and magnesium sulfate solution with a concentration of 30000 mg / L respectively and put them into three burettes respectively; A3: Repeatedly drip sodium chloride solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the fixed electrode system coefficient and the resistance of the experimental device , which is implemented as follows: A31: drip the sodium chloride solution into the open water tank through a burette, read the first resistance value r1 using a digital bridge, and calculate the first theoretical resistivity R1; A32: drip sodium chloride solution into the open water tank again through the burette, read the second resistance value r2 using the digital bridge, and calculate the second theoretical resistivity R2; A33: Repeat step A32 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into the Excel spreadsheet to obtain the relationship between the fixed electrode system coefficient and resistance of the experimental device. ,in, represents the fixed electrode system coefficient of the experimental device, Represents the resistance of a single salt, Represents a relational function; A4: Repeatedly drip magnesium chloride solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization and resistivity of the two mixed salts. , which is implemented as follows: A41: Use a syringe to take out 10 ml of solution from the open water tank; A42: Use a burette to drop 10 ml of magnesium chloride solution into the open water tank to allow it to diffuse; A43: Read the third resistance value r3 using a digital bridge; A44: Calculate the third mineralization k3 of the solution at this time according to the third resistance value r3, and the calculation formula is: in, Indicates the volume of the solution taken out this time, represents the concentration of magnesium chloride solution, represents the volume of pure water, Indicates the salt concentration of the solution in the water tank before the solution is extracted; A45: Repeat step A44 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an excel spreadsheet to obtain the relationship between the mineralization and resistivity of the two mixed salts. ,in, represents the fixed electrode system coefficient of the experimental device, represents the resistance of two mixed salts, Indicates the mineralization of two mixed salts. Represents a relational function; A5: Repeatedly drip magnesium sulfate solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization degree and resistivity of the three mixed salts. , which is implemented as follows: A51: Use a syringe to take out 10 ml of solution from the open water tank; A52: Use a burette to drop 10 ml of magnesium sulfate solution into the open water tank to allow it to diffuse; A53: Read the fourth resistance value r4 using a digital bridge; A54: Calculate the fourth mineralization k4 of the solution at this time according to the fourth resistance value r4, and the calculation formula is: in, Indicates the volume of the solution taken out this time, Indicates the concentration of magnesium sulfate solution, represents the volume of pure water, Indicates the salt concentration of the solution in the water tank before the solution is extracted; A55: Repeat step A54 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an excel spreadsheet to obtain the relationship between the mineralization and resistivity of the three mixed salts. ,in, represents the fixed electrode system coefficient of the experimental device, Represents the resistance of the three mixed salts, Indicates the mineralization of three mixed salts, Represents a relational function.

2. An experimental method based on the conversion of formation water salinity and resistivity, characterized in that: The following steps are involved: S1: Pour 0.8L of pure water into the open water tank; S2: Prepare sodium chloride solution, magnesium chloride solution and magnesium sulfate solution with a concentration of 30000 mg / L respectively, and put them into three burettes respectively; S3: Repeatedly drip sodium chloride solution into the open water tank through the burette, use the digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the fixed electrode system coefficient and the resistance of the experimental device ; The step S3 comprises the following sub-steps: S31: dripping sodium chloride solution into the open water tank through a burette, reading a first resistance value r1 using a digital bridge, and calculating a first theoretical resistivity R1; S32: dripping sodium chloride solution into the open water tank again through the burette, reading the second resistance value r2 using the digital bridge, and calculating the second theoretical resistivity R2; S33: Repeat step S32 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an excel sheet to obtain the relationship between the fixed electrode system coefficient and resistance of the experimental device. ,in, represents the fixed electrode system coefficient of the experimental device, Represents the resistance of a single salt, Represents a relational function; S4: Repeatedly drip magnesium chloride solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization and resistivity of the two mixed salts. ; The step S4 comprises the following sub-steps: S41: Take out 10 ml of solution from the open water tank using a syringe; S42: Using a burette, drip 10 ml of magnesium chloride solution into the open water tank to allow it to diffuse; S43: Reading a third resistance value r3 using a digital bridge; S44: Calculate the third mineralization k3 of the solution at this time according to the third resistance value r3, and the calculation formula is: in, Indicates the volume of the solution taken out this time, represents the concentration of magnesium chloride solution, represents the volume of pure water, Indicates the salt concentration of the solution in the water tank before the solution is extracted; S45: Repeat step S44 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the mineralization degree and resistivity of the two mixed salts. ,in, represents the fixed electrode system coefficient of the experimental device, represents the resistance of two mixed salts, Indicates the mineralization of two mixed salts. Represents a relational function; S5: Repeatedly drip magnesium sulfate solution into the open water tank through a burette, use a digital bridge to read the resistance value, and calculate the theoretical resistivity to obtain the relationship between the mineralization degree and resistivity of the three mixed salts ; The step S5 comprises the following sub-steps: S51: Take out 10 ml of solution from the open water tank using a syringe; S52: Using a burette, drip 10 ml of magnesium sulfate solution into the open water tank to allow it to diffuse; S53: Reading the fourth resistance value r4 using a digital bridge; S54: Calculate the fourth mineralization k4 of the solution at this time according to the fourth resistance value r4, and the calculation formula is: in, Indicates the volume of the solution taken out this time, Indicates the concentration of magnesium sulfate solution, represents the volume of pure water, Indicates the salt concentration of the solution in the water tank before the solution is extracted; S55: Repeat step S54 five times to obtain five sets of resistance values ​​and theoretical resistivity, and import them into an Excel spreadsheet to obtain the relationship between the mineralization degree and resistivity of the three mixed salts. ,in, represents the fixed electrode system coefficient of the experimental device, Represents the resistance of the three mixed salts, Indicates the mineralization of three mixed salts, Represents a relational function.

3. The experimental method based on formation water salinity and resistivity conversion according to claim 2 is characterized in that: The step S31 includes the following sub-steps: S311: Take out 10 ml of pure water from the open water tank using a syringe; S312: Using a burette, drip 10 ml of sodium chloride solution into the open water tank to allow it to diffuse; S313: Reading the first resistance value r1 using a digital bridge; S314: Calculate the first mineralization degree k1 of the solution at this time according to the first resistance value r1, and the calculation formula is: in, Indicates the volume of pure water taken out this time, represents the concentration of sodium chloride solution, Indicates the volume of pure water; S315: According to the room temperature and the first salinity k1 of the solution at this time, a first theoretical resistivity R1 of the solution at this time is obtained using a salinity-resistivity conversion chart.

4. The experimental method based on formation water salinity and resistivity conversion according to claim 2 is characterized in that: The step S32 includes the following sub-steps: S321: Use a syringe to take out 10 ml of solution from the open water tank; S322: Using a burette, drip 10 ml of sodium chloride solution into the open water tank to allow it to diffuse; S323: Read the second resistance value r2 using a digital bridge; S324: Calculate the second mineralization degree k2 of the solution at this time according to the second resistance value r2, and the calculation formula is: in, Indicates the volume of the solution taken out this time, represents the concentration of sodium chloride solution, represents the volume of pure water, Indicates the salt concentration of the solution in the water tank before the solution is extracted; S325: According to the room temperature and the second mineralization k2 of the solution at this time, a second theoretical resistivity R2 of the solution at this time is obtained using a mineralization-resistivity conversion chart.

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