A heavy oil water content measuring device and a calibration method thereof

Abstract

The application provides a calibration method of a heavy oil water content measuring device, and belongs to the technical field of crude oil water content measurement. The method comprises the following steps: collecting heavy oil water content information by using the heavy oil water content measuring device, wherein the water content information comprises an oil film adsorption amount, a water content and an output current; and establishing a calculation model between the heavy oil water content and the output current according to the relationship between the oil film adsorption amount and the water content. The method can calibrate the water content of heavy oil under the condition that the measuring probe is adsorbed by the oil phase, so that the measuring probe can stably and reliably measure the water content of heavy oil in actual application, and has important significance for heavy oil development.

Description

Technical Field

[0001] This invention relates to the field of crude oil water content measurement technology, and in particular to a heavy oil water content measuring device and its calibration method. Background Technology

[0002] In the crude oil extraction process, the water content of the oil-water mixture is a very important parameter in the oil well production process. Accurate measurement of crude oil water content is of great significance for the customization of oilfield extraction plans, as well as for extending the service life of oil wells and improving crude oil recovery.

[0003] Currently, the methods for measuring crude oil water content in the domestic and international petroleum industry can be mainly divided into two categories: manual sampling and analysis, and online measurement. Traditional methods for measuring the water content of heavy oil all employ manual sampling and centralized analysis. This method suffers from high randomness and poor continuity in sampling, making it difficult to guarantee the accuracy of heavy oil water content measurements and failing to meet the needs of automated oilfield production. Currently, research and product development of various online measurement technologies, such as impedance, capacitance, radiometric, and microwave methods, have been carried out both domestically and internationally, and have achieved certain applications in the field of online water content measurement at the wellhead of conventional light and medium crude oils. However, heavy oil has characteristics such as high viscosity, poor fluidity, and severe oil-water emulsification, making it easy for the measuring probe to absorb crude oil, affecting the stability of the output results. This presents new challenges to the calibration technology of heavy oil water content measuring devices.

[0004] Chinese patent application CN103048352A measures the water cut of heavy oil by adding a certain amount of solvent to the sample and using a distillation method. Chinese patent application CN106970005A improves existing water cut sampling and determination methods and applies them to wellhead samples with high water cut, but it is an offline measurement method and lacks real-time capability. Chinese patent application CN104280430A uses a traditional capacitance and conductivity method to measure water cut, improving accuracy through algorithm modification; however, in principle, the traditional capacitance and conductivity method is highly dependent on the electrical properties of the fluid, making the measurement results susceptible to influence. Chinese patent application CN110672642A uses a gamma-ray method to measure water cut, achieving full-range measurement from 0-100%, but the presence of a radioactive source results in high cost and maintenance difficulty, making it unsuitable for widespread use in single wells. Chinese patent application CN110261411A uses a microwave method for online measurement of crude oil water content. It utilizes microwave technology to simultaneously detect the amplitude and phase changes of transmitted and reflected microwave waves, combined with a specific algorithm, to measure water content. However, in practical applications, the microwave method involves complex calculations and is costly. Chinese patent application CN112924475A proposes a water content measurement sensor and a crude oil water content detection system based on the shortwave method. This system includes a probe cleaner to remove oil and wax buildup on the probe surface; however, this device contains moving sealing components, resulting in a complex structure.

[0005] The existing technology has the following shortcomings:

[0006] 1. The heavy oil water content measurement probe is prone to adsorbing crude oil, which affects the stability of the output results, thus posing a new challenge to the calibration technology of heavy oil water content measurement devices;

[0007] 2. Measuring devices with probe erasers have complex structures and high costs;

[0008] 3. Traditional measurement methods that combine capacitance and conductance have poor measurement accuracy. Summary of the Invention

[0009] To address the problems existing in the prior art, this invention provides a heavy oil water content measuring device and its calibration method. The calibration method includes the following steps: A heavy oil film adsorption calibration test is conducted using the heavy oil water content measuring device. The heavy oil produced from the oil well is heated to a flowing state, and the adsorption thickness of the heavy oil film is calibrated at different temperatures to obtain a curve showing the change in oil film adsorption amount with temperature. A heavy oil water content measuring experiment is conducted using the heavy oil water content measuring device. Based on the curve showing the change in oil film adsorption amount with temperature, a temperature value that maintains a stable adsorption amount is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water contents α are prepared. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I is determined based on the oil film adsorption amount q. e With moisture content α V The relationship between the two is used to calculate the outer diameter d3 of the electrode of the measuring device after oil film adsorption; the columnar capacitance C formed by the measuring device is calculated; based on the obtained columnar capacitance C and the linear relationship between capacitance C and output current I, the heavy oil water content α is established. V The correlation between the output current I and the heavy oil water content α is obtained by fitting the collected water content and the output current. V By obtaining the constant value in the correlation formula between the water content of heavy oil and the output current I, the calibration correlation formula between the water content of heavy oil and the output current is obtained. This invention experimentally calibrates the water content of heavy oil when the measuring probe is adsorbed by the oil phase, ensuring that the measuring probe maintains stable and reliable measurement of the water content of heavy oil in practical applications, which is of great significance for the development of heavy oil.

[0010] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current.

[0011] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0012] A heavy oil water content measuring device was used to collect heavy oil water content information, which included oil film adsorption amount, water content and output current.

[0013] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current.

[0014] Preferably, the water content information of heavy oil is collected by conducting heavy oil film adsorption calibration tests and heavy oil water content measurement experiments.

[0015] Preferably, the curve of oil film adsorption amount versus temperature is obtained by conducting a heavy oil film adsorption calibration test.

[0016] Preferably, a heavy oil film adsorption calibration test is conducted using a heavy oil water content measuring device. The heavy oil produced from the oil well is heated to a fluid state, and the adsorption thickness of the heavy oil film at different temperatures is calibrated to obtain the curve of the oil film adsorption amount changing with temperature.

[0017] Preferably, different water contents α are obtained by conducting heavy oil water content measurement experiments. V The corresponding output current I.

[0018] Preferably, a heavy oil water content measuring device is used to conduct a heavy oil water content measurement experiment. Based on the curve of oil film adsorption amount changing with temperature, a temperature value that keeps the adsorption amount stable is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water contents α are prepared. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I.

[0019] Preferably, the step of establishing a calculation model between the water content of heavy oil and the output signal based on the relationship between the oil film adsorption amount and the water content includes the following steps:

[0020] Based on the oil film adsorption amount q e With moisture content α V The relationship between these factors is used to calculate the outer diameter d3 of the electrode in the measuring device after oil film adsorption.

[0021] Calculate the columnar capacitance C formed by the measuring device;

[0022] Based on the obtained columnar capacitance C and the linear relationship between capacitance C and output current I, the heavy oil water content α is established. V The relationship between the output current I and the output current I;

[0023] The water content α of heavy oil was obtained by fitting the collected water content and output current. VThe constant value in the correlation between the heavy oil water content and the output current I is used to obtain the calibration correlation between the heavy oil water content and the output current.

[0024] Preferably, based on the oil film adsorption amount q e With moisture content α V The relationship between these parameters is calculated using the following formula to determine the outer diameter of the electrode in the measuring device after oil film adsorption:

[0025]

[0026] q e =k(1-α) V ) 1 / n

[0027] in,

[0028] k is a constant characterizing adsorption;

[0029] l represents the length of the liquid film adhering to the probe surface, in mm;

[0030] n is a constant;

[0031] d3 is the outer diameter of the electrode of the measuring device after oil film adsorption, in mm;

[0032] d2 is the outer diameter of the measuring electrode before oil film adsorption, in mm;

[0033] ρ oil This refers to the density of heavy oil, expressed in kg / m³. 3

[0034] Preferably, the columnar capacitance C formed by the measuring device is calculated using the following formula:

[0035]

[0036] in,

[0037] ε r ρ is the dielectric constant of the dielectric, F / m;

[0038] ε0 is the absolute permittivity of vacuum, ε0 = 8.85 × 10⁻⁶ -12 F / m;

[0039] k0, k1, k2, k3 are constants representing the linear relationship;

[0040] d1 is the diameter of the uncoated electrode, in mm;

[0041] Preferably, the water content α of heavy oil is established based on the obtained columnar capacitor C and the linear relationship between capacitor C and output current I. V The relationship between the output current I and the output current is as follows:

[0042]

[0043] in,

[0044] k4 represents the output current value under pure oil operating conditions.

[0045] Preferably, the water content α of the heavy oil is obtained by fitting the collected water content and the output current. V The constant values ​​in the correlation between the output current I and the constants k1, k2, k3 and k4 are obtained by fitting.

[0046] This invention provides a heavy oil water content measuring device and a calibration method for any of the above-mentioned heavy oil water content measuring devices, comprising: a wire electrode, a measuring electrode, and a data acquisition and processing system;

[0047] Both the lead electrode and the measuring electrode are connected to the data acquisition and processing system;

[0048] The current signals output by the lead electrode and the measuring electrode are analyzed and calculated by the data acquisition and processing system to output the water content of heavy oil.

[0049] Preferably, the lead electrode and the measuring electrode are connected to the data acquisition and processing system through the housing.

[0050] Preferably, the measuring electrode and the wire electrode are located below the housing, and the measuring electrode and the wire electrode are cylindrical, arranged in parallel, and both the measuring electrode and the wire electrode are perpendicular to the lower surface of the housing.

[0051] Preferably, the measuring electrode includes a measuring probe and an insulating medium, the insulating medium covering the sidewalls and bottom wall of the measuring probe.

[0052] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0053] (1) This invention uses a heavy oil water content measurement probe to collect water content information. By considering the relationship between oil film adsorption and water content, a calculation model between heavy oil water content and output signal is established. The method of this invention calibrates the water content of heavy oil by means of the measurement probe being adsorbed by the oil phase, so that the measurement probe can maintain stable and reliable measurement of heavy oil water content in practical applications, which is of great significance to the development of heavy oil. Attached Figure Description

[0054] Figure 1 A flowchart of a calibration method for a heavy oil water content measuring device according to an embodiment of the present invention;

[0055] Figure 2 Flowchart of a calibration method for a heavy oil water content measuring device according to another embodiment of the present invention;

[0056] Figure 3 Flowchart of a calibration method for a heavy oil water content measuring device according to another embodiment of the present invention;

[0057] Figure 4 A curve showing the relationship between the water content of heavy oil and the output current in one embodiment of the present invention;

[0058] Figure 5 A schematic diagram illustrating the measurement error of heavy oil water content according to an embodiment of the present invention;

[0059] Figure 6 A schematic diagram of a heavy oil water content measuring device according to an embodiment of the present invention;

[0060] Figure 7 A schematic diagram of the structure of the measuring electrode in a heavy oil water content measuring device according to an embodiment of the present invention is shown in the figure, which is a measuring electrode that has been adsorbed with crude oil.

[0061] In the figure, 1-wire electrode, 2-measuring electrode, 3-measuring probe, 4-insulating medium, 5-adsorbed crude oil, 6-data acquisition and processing system. Detailed Implementation

[0062] The following is in conjunction with the appendix Figure 1-7 The specific embodiments of the present invention will be described in detail below.

[0063] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0064] A heavy oil water content measuring device was used to collect heavy oil water content information, which included oil film adsorption amount, water content and output current.

[0065] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current.

[0066] According to a specific embodiment of the present invention, the water content information of heavy oil is collected by conducting a heavy oil film adsorption calibration test and a heavy oil water content measurement test.

[0067] According to a specific embodiment of the present invention, the curve of oil film adsorption amount as a function of temperature is obtained by conducting a heavy oil film adsorption calibration test.

[0068] According to a specific embodiment of the present invention, a heavy oil film adsorption calibration test is conducted using a heavy oil water content measuring device. The heavy oil produced from the oil well is heated to a fluid state, and the adsorption thickness of the heavy oil film at different temperatures is calibrated to obtain the curve of the oil film adsorption amount changing with temperature.

[0069] According to a specific embodiment of the present invention, different water contents α are obtained by conducting heavy oil water content measurement experiments. VThe corresponding output current I.

[0070] According to a specific embodiment of the present invention, a heavy oil water content measuring device is used to conduct a heavy oil water content measurement experiment. Based on the curve of oil film adsorption amount changing with temperature, a temperature value that keeps the adsorption amount stable is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water contents α are prepared respectively. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I.

[0071] According to a specific embodiment of the present invention, the step of establishing a calculation model between the water content of heavy oil and the output signal based on the relationship between the oil film adsorption amount and the water content includes the following steps:

[0072] Based on the oil film adsorption amount q e With moisture content α V The relationship between these factors is used to calculate the outer diameter d3 of the electrode in the measuring device after oil film adsorption.

[0073] Calculate the columnar capacitance C formed by the measuring device;

[0074] Based on the obtained columnar capacitance C and the linear relationship between capacitance C and output current I, the heavy oil water content α is established. V The relationship between the output current I and the output current I;

[0075] The water content α of heavy oil was obtained by fitting the collected water content and output current. V The constant value in the correlation between the heavy oil water content and the output current I is used to obtain the calibration correlation between the heavy oil water content and the output current.

[0076] According to a specific embodiment of the present invention, based on the oil film adsorption amount q e With moisture content α V The relationship between these parameters is calculated using the following formula to determine the outer diameter of the electrode in the measuring device after oil film adsorption:

[0077]

[0078] q e =k(1-α) V ) 1 / n

[0079] in,

[0080] k is a constant characterizing adsorption;

[0081] l represents the length of the liquid film adhering to the probe surface, in mm;

[0082] n is a constant;

[0083] d3 is the outer diameter of the electrode of the measuring device after oil film adsorption, in mm;

[0084] d2 is the outer diameter of the measuring electrode before oil film adsorption, in mm;

[0085] ρ oil This refers to the density of heavy oil, expressed in kg / m³. 3

[0086] According to a specific embodiment of the present invention, the columnar capacitance C formed by the measuring device is calculated using the following formula:

[0087]

[0088] in,

[0089] ε r ρ is the dielectric constant of the dielectric, F / m;

[0090] ε0 is the absolute permittivity of vacuum, ε0 = 8.85 × 10⁻⁶ -12 F / m;

[0091] k0, k1, k2, k3 are constants representing the linear relationship;

[0092] d1 is the diameter of the uncoated electrode, in mm;

[0093] According to a specific embodiment of the present invention, the water content α of heavy oil is established based on the obtained columnar capacitor C and the linear relationship between capacitor C and output current I. V The relationship between the output current I and the output current is as follows:

[0094]

[0095] in,

[0096] k4 represents the output current value under pure oil operating conditions.

[0097] According to a specific embodiment of the present invention, the water content α of heavy oil is obtained by fitting the collected water content and the output current. V The constant values ​​in the correlation between the output current I and the constants k1, k2, k3 and k4 are obtained by fitting.

[0098] This invention provides a heavy oil water content measuring device and a calibration method for any of the above-mentioned heavy oil water content measuring devices, comprising: a wire electrode 1, a measuring electrode 2, and a data acquisition and processing system 6;

[0099] Both the lead electrode 1 and the measuring electrode 2 are connected to the data acquisition and processing system 6;

[0100] The current signals output by the lead electrode 1 and the measuring electrode 2 are analyzed and calculated by the data acquisition and processing system 6 to output the water content of heavy oil.

[0101] According to one specific embodiment of the present invention, the wire electrode 1 and the measuring electrode 2 are connected to the data acquisition and processing system 6 through the housing.

[0102] According to a specific embodiment of the present invention, the measuring electrode 2 and the wire electrode 2 are located below the housing. The measuring electrode 1 and the wire electrode 2 are cylindrical and are arranged in parallel. Both the measuring electrode 1 and the wire electrode 2 are perpendicular to the lower surface of the housing.

[0103] According to a specific embodiment of the present invention, the measuring electrode 1 includes a measuring probe 3 and an insulating medium 4, the insulating medium 4 covering the sidewalls and bottom wall of the measuring probe 3.

[0104] Example 1

[0105] According to a specific embodiment of the present invention, the heavy oil water content measuring device of the present invention will be described in detail below.

[0106] This invention provides a heavy oil water content measuring device and a calibration method for any of the above-mentioned heavy oil water content measuring devices, comprising: a wire electrode 1, a measuring electrode 2, and a data acquisition and processing system 6;

[0107] Both the lead electrode 1 and the measuring electrode 2 are connected to the data acquisition and processing system 6;

[0108] The current signals output by the lead electrode 1 and the measuring electrode 2 are analyzed and calculated by the data acquisition and processing system 6 to output the water content of heavy oil.

[0109] The lead electrode 1 and the measuring electrode 2 are connected to the data acquisition and processing system 6 through the housing.

[0110] Measuring electrode 2 and wire electrode 2 are located below the housing. Measuring electrode 1 and wire electrode 2 are cylindrical and arranged in parallel. Both measuring electrode 1 and wire electrode 2 are perpendicular to the lower surface of the housing.

[0111] The measuring electrode 1 includes a measuring probe 3 and an insulating medium 4, which encloses the sidewalls and bottom wall of the measuring probe 3.

[0112] Example 2

[0113] According to a specific embodiment of the present invention, the calibration method of the heavy oil water content measuring device of the present invention will be described in detail below.

[0114] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0115] A heavy oil water content measuring device was used to collect heavy oil water content information, which included oil film adsorption amount, water content and output current.

[0116] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current.

[0117] Example 3

[0118] According to a specific embodiment of the present invention, the calibration method of the heavy oil water content measuring device of the present invention will be described in detail below.

[0119] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0120] Heavy oil water content measurement devices were used to collect heavy oil water content information, including oil film adsorption capacity, water content, and output current. Specifically, oil film adsorption calibration experiments were conducted to obtain the oil film adsorption capacity as a function of temperature. The heavy oil film adsorption calibration experiments were performed using the heavy oil water content measurement devices. Heavy oil produced from the well was heated to a fluid state, and the oil film adsorption thickness was calibrated at different temperatures to obtain the oil film adsorption capacity as a function of temperature. Finally, heavy oil water content measurement experiments were conducted to obtain the water content α at different water contents. V The corresponding output current I;

[0121] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current.

[0122] Example 4

[0123] According to a specific embodiment of the present invention, the calibration method of the heavy oil water content measuring device of the present invention will be described in detail below.

[0124] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0125] A heavy oil water content measuring device was used to collect heavy oil water content information, including oil film adsorption capacity, water content, and output current. Specifically, a heavy oil film adsorption calibration test was conducted to obtain the oil film adsorption capacity as a function of temperature. The heavy oil film adsorption calibration test was carried out using the heavy oil water content measuring device. The heavy oil produced from the oil well was heated to a fluid state, and the heavy oil film adsorption thickness was calibrated at different temperatures to obtain the oil film adsorption capacity as a function of temperature.

[0126] Experiments were conducted to measure the water content of heavy oil, and different water contents α were obtained. VThe corresponding output current I is as follows: A heavy oil water content measurement experiment is conducted using a heavy oil water content measuring device. Based on the curve of oil film adsorption amount changing with temperature, a temperature value that keeps the adsorption amount stable is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water content α is configured. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I;

[0127] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current.

[0128] Example 5

[0129] According to a specific embodiment of the present invention, the calibration method of the heavy oil water content measuring device of the present invention will be described in detail below.

[0130] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0131] A heavy oil water content measuring device was used to collect heavy oil water content information, including oil film adsorption capacity, water content, and output current. Specifically, a heavy oil film adsorption calibration test was conducted to obtain the oil film adsorption capacity as a function of temperature. The heavy oil film adsorption calibration test was carried out using the heavy oil water content measuring device. The heavy oil produced from the oil well was heated to a fluid state, and the heavy oil film adsorption thickness was calibrated at different temperatures to obtain the oil film adsorption capacity as a function of temperature.

[0132] Experiments were conducted to measure the water content of heavy oil, and different water contents α were obtained. V The corresponding output current I is as follows: A heavy oil water content measurement experiment is conducted using a heavy oil water content measuring device. Based on the curve of oil film adsorption amount changing with temperature, a temperature value that keeps the adsorption amount stable is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water content α is configured. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I;

[0133] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current, including the following steps:

[0134] Based on the oil film adsorption amount q e With moisture content α V The relationship between these factors is used to calculate the outer diameter d3 of the electrode in the measuring device after oil film adsorption.

[0135] Calculate the columnar capacitance C formed by the measuring device;

[0136] Based on the obtained columnar capacitance C and the linear relationship between capacitance C and output current I, the heavy oil water content α is established. V The relationship between the output current I and the output current I;

[0137] The water content α of heavy oil was obtained by fitting the collected water content and output current. V The constant value in the correlation between the heavy oil water content and the output current I is used to obtain the calibration correlation between the heavy oil water content and the output current.

[0138] Example 6

[0139] According to a specific embodiment of the present invention, the calibration method of the heavy oil water content measuring device of the present invention will be described in detail below.

[0140] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0141] A heavy oil water content measuring device was used to collect heavy oil water content information, including oil film adsorption capacity, water content, and output current. Specifically, a heavy oil film adsorption calibration test was conducted to obtain the oil film adsorption capacity as a function of temperature. The heavy oil film adsorption calibration test was carried out using the heavy oil water content measuring device. The heavy oil produced from the oil well was heated to a fluid state, and the heavy oil film adsorption thickness was calibrated at different temperatures to obtain the oil film adsorption capacity as a function of temperature.

[0142] Experiments were conducted to measure the water content of heavy oil, and different water contents α were obtained. V The corresponding output current I is as follows: A heavy oil water content measurement experiment is conducted using a heavy oil water content measuring device. Based on the curve of oil film adsorption amount changing with temperature, a temperature value that keeps the adsorption amount stable is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water content α is configured. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I;

[0143] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current, including the following steps:

[0144] Based on the oil film adsorption amount q e With moisture content α V The relationship between these parameters is calculated using the following formula to determine the outer diameter d3 of the electrode in the measuring device after oil film adsorption:

[0145]

[0146] q e =k(1-α) V ) 1 / n

[0147] in,

[0148] k is a constant characterizing adsorption;

[0149] l represents the length of the liquid film adhering to the probe surface, in mm;

[0150] n is a constant;

[0151] d3 is the outer diameter of the electrode of the measuring device after oil film adsorption, in mm;

[0152] d2 is the outer diameter of the measuring electrode before oil film adsorption, in mm;

[0153] ρ oil This refers to the density of heavy oil, expressed in kg / m³. 3 ;

[0154] Calculate the columnar capacitance C formed by the measuring device;

[0155] Based on the obtained columnar capacitance C and the linear relationship between capacitance C and output current I, the heavy oil water content α is established. V The relationship between the current and the output current I.

[0156] The water content α of heavy oil was obtained by fitting the collected water content and output current. V The constant values ​​in the correlation between the output current I and the output current are obtained by fitting the values ​​of constants k1, k2, k3 and k4, and then obtaining the calibration correlation between the water content of heavy oil and the output current.

[0157] Example 7

[0158] According to a specific embodiment of the present invention, the calibration method of the heavy oil water content measuring device of the present invention will be described in detail below.

[0159] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0160] A heavy oil water content measuring device was used to collect heavy oil water content information, including oil film adsorption capacity, water content, and output current. Specifically, a heavy oil film adsorption calibration test was conducted to obtain the oil film adsorption capacity as a function of temperature. The heavy oil film adsorption calibration test was carried out using the heavy oil water content measuring device. The heavy oil produced from the oil well was heated to a fluid state, and the heavy oil film adsorption thickness was calibrated at different temperatures to obtain the oil film adsorption capacity as a function of temperature.

[0161] Experiments were conducted to measure the water content of heavy oil, and different water contents α were obtained. V The corresponding output current I is as follows: A heavy oil water content measurement experiment is conducted using a heavy oil water content measuring device. Based on the curve of oil film adsorption amount changing with temperature, a temperature value that keeps the adsorption amount stable is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water content α is configured. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I;

[0162] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current, including the following steps:

[0163] Based on the oil film adsorption amount q e With moisture content α V The relationship between these parameters is calculated using the following formula to determine the outer diameter d3 of the electrode in the measuring device after oil film adsorption.

[0164] The cylindrical capacitance C formed by the measuring device is calculated using the following formula:

[0165]

[0166] in,

[0167] ε r ρ is the dielectric constant of the dielectric, F / m;

[0168] ε0 is the absolute permittivity of vacuum, ε0 = 8.85 × 10⁻⁶ -12 F / m;

[0169] k0, k1, k2, k3 are constants representing the linear relationship;

[0170] d1 is the diameter of the uncoated electrode, in mm;

[0171] Based on the obtained columnar capacitance C and the linear relationship between capacitance C and output current I, the heavy oil water content α is established. V The relationship between the current and the output current I is as follows:

[0172]

[0173] in,

[0174] k4 represents the output current value under pure oil operating conditions.

[0175] The water content α of heavy oil was obtained by fitting the collected water content and output current. VThe constant values ​​in the correlation between the output current I and the output current are obtained by fitting the values ​​of constants k1, k2, k3 and k4, and then obtaining the calibration correlation between the water content of heavy oil and the output current.

[0176] Example 8

[0177] According to a specific embodiment of the present invention, the calibration method of the heavy oil water content measuring device of the present invention will be described in detail below.

[0178] This invention provides a calibration method for a heavy oil water content measuring device, comprising the following steps:

[0179] A heavy oil water content measuring device was used to collect heavy oil water content information, including oil film adsorption capacity, water content, and output current. Specifically, a heavy oil film adsorption calibration test was conducted to obtain the oil film adsorption capacity as a function of temperature. The heavy oil film adsorption calibration test was carried out using the heavy oil water content measuring device. The heavy oil produced from the oil well was heated to a fluid state, and the heavy oil film adsorption thickness was calibrated at different temperatures to obtain the oil film adsorption capacity as a function of temperature.

[0180] Experiments were conducted to measure the water content of heavy oil, and different water contents α were obtained. V The corresponding output current I is as follows: A heavy oil water content measurement experiment is conducted using a heavy oil water content measuring device. Based on the curve of oil film adsorption amount changing with temperature, a temperature value that keeps the adsorption amount stable is determined, and this temperature value is used as the set temperature. The heavy oil produced from the oil well is heated to the set temperature, and different volumetric water content α is configured. V The oil-water mixture was prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrated using an online crude oil water content measurement device to collect data at different water contents (α). V The corresponding output current I;

[0181] Based on the relationship between oil film adsorption and water content, a calculation model is established between the water content of heavy oil and the output current, including the following steps:

[0182] Based on the oil film adsorption amount q e With moisture content α V The relationship between these parameters is calculated using the following formula to determine the outer diameter d3 of the electrode in the measuring device after oil film adsorption:

[0183]

[0184] q e =k(1-α) V ) 1 / n

[0185] in,

[0186] k is a constant characterizing adsorption;

[0187] l represents the length of the liquid film adhering to the probe surface, in mm;

[0188] n is a constant;

[0189] d3 is the outer diameter of the electrode of the measuring device after oil film adsorption, in mm;

[0190] d2 is the outer diameter of the measuring electrode before oil film adsorption, in mm;

[0191] ρ oil This refers to the density of heavy oil, expressed in kg / m³. 3 ;

[0192] The cylindrical capacitance C formed by the measuring device is calculated using the following formula:

[0193]

[0194] in,

[0195] ε r ρ is the dielectric constant of the dielectric, F / m;

[0196] ε0 is the absolute permittivity of vacuum, ε0 = 8.85 × 10⁻⁶ -12 F / m;

[0197] k0, k1, k2, k3 are constants representing the linear relationship;

[0198] d1 is the diameter of the uncoated electrode, in mm;

[0199] Based on the obtained columnar capacitance C and the linear relationship between capacitance C and output current I, the heavy oil water content α is established. V The relationship between the current and the output current I is as follows:

[0200]

[0201] in,

[0202] k4 represents the output current value under pure oil operating conditions.

[0203] The water content α of heavy oil was obtained by fitting the collected water content and output current. V The constant values ​​in the correlation between the output current I and the output current are obtained by fitting the values ​​of constants k1, k2, k3 and k4, and then obtaining the calibration correlation between the water content of heavy oil and the output current.

[0204] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention are included within the scope of protection of the present invention.

Claims

1. A calibration method for a heavy oil water content measuring device, characterized in that, Includes the following steps: A heavy oil water content measuring device was used to collect heavy oil water content information, which included oil film adsorption amount, water content and output current. Based on the relationship between oil film adsorption and water content, a calculation model is established between heavy oil water content and output current. The step of establishing a calculation model between the water content of heavy oil and the output signal based on the relationship between oil film adsorption and water content includes the following steps: According to the relationship between the oil film adsorption amount q e and the water content , the outer diameter of the electrode of the oil film adsorption measuring device after the oil film adsorption is calculated d 3; The columnar capacitance C formed by the calculation and measuring device; According to the obtained columnar capacitance C and the linear relationship between the capacitance C and the output current I, the correlation formula between the water content of the heavy oil and the output current I is established and the output current I is established. The water content of heavy oil was obtained by fitting the collected water content and output current. The constant value in the correlation between the heavy oil water content and the output current I is used to obtain the calibration correlation between the heavy oil water content and the output current. wherein the relationship between the oil film adsorption amount q e and the water content The outer diameter of the electrode of the measuring device after the oil film adsorption is calculated using the following equation: in, k to characterize the constants of adsorption; l L is the length of the liquid film attached to the probe surface, in mm; n is constant; d 3 is the outer diameter of the electrode of the oil film adsorption measuring device, in mm; d 2 is the outer diameter of the measuring electrode before oil film adsorption, in mm; For heavy oil density, unit is kg / m 3 ; The columnar capacitance C formed by the measuring device is calculated using the following formula: in, dielectric constant of the dielectric, F / m; For the vacuum absolute permittivity, ε 0 = 8.85 x 10 -12 F / m; k 0 ，k 1 ，k 2 ，k 3 is a constant representing a linear relationship; d 1 is the uncoated electrode diameter in mm; Wherein, according to the obtained columnar capacitance C and the linear relationship between the capacitance C and the output current I, the correlation formula between the water content of the heavy oil and the output current I is established as follows: And the output current I ​ in, k 4 is the corresponding output current value size under the pure oil working condition.

2. The calibration method for the heavy oil water content measuring device according to claim 1, characterized in that, Heavy oil water content information was collected by conducting heavy oil film adsorption calibration experiments and heavy oil water content measurement experiments.

3. The method of calibrating a heavy oil water cut measurement device of claim 2, wherein, The curve of oil film adsorption amount changing with temperature was obtained by conducting a calibration test on heavy oil film adsorption.

4. The method of calibrating a heavy oil water cut measurement device of claim 3, wherein, Heavy oil film adsorption calibration test was conducted using a heavy oil water content measuring device. The heavy oil produced from the oil well was heated to a fluid state, and the adsorption thickness of the heavy oil film at different temperatures was calibrated to obtain the curve of oil film adsorption amount changing with temperature.

5. The method of calibrating a heavy oil water cut measurement device of claim 4, wherein, By conducting the heavy oil water content measurement experiment, different water contents The corresponding output current I.

6. The method of calibrating a heavy oil water cut measurement device of claim 5, wherein, Heavy oil water content measurement experiments were conducted using a heavy oil water content measuring device. Based on the curve of oil film adsorption capacity versus temperature, a temperature value that maintains stable adsorption capacity was determined and used as the set temperature. Heavy oil produced from the well was heated to the set temperature, and different volumetric water contents were prepared. The oil-water mixture is prepared by thoroughly mixing heavy oil with produced water from the oil well, and then calibrating using an online crude oil water content measurement device to collect data at different water contents. The corresponding output current I.

7. The method of calibrating a heavy oil water cut measurement device of claim 6, wherein, The constant value in the correlation between the water cut and the output current I, specifically the fitted constant The constant value in the correlation between the water cut and the output current I, specifically the fitted constant k 1、 k 2、 k 3 and k 4.

8. A device for measuring water cut of heavy oil, characterized in that, A calibration method for the heavy oil water content measuring device according to any one of claims 1-7, comprising: a wire electrode, a measuring electrode, and a data acquisition and processing system; Both the lead electrode and the measuring electrode are connected to the data acquisition and processing system; The current signals output by the lead electrode and the measuring electrode are analyzed and calculated by the data acquisition and processing system to output the water content of heavy oil.

9. The apparatus according to claim 8, wherein The lead electrode and measuring electrode are connected to the data acquisition and processing system through the housing.

10. The apparatus according to claim 9, wherein The measuring electrode and the lead electrode are located at the bottom of the housing. The measuring electrode and the lead electrode are cylindrical and arranged in parallel. Both the measuring electrode and the lead electrode are perpendicular to the lower surface of the housing.

11. The apparatus according to claim 10, wherein The measuring electrode consists of a measuring probe and an insulating medium, which encloses the sidewalls and bottom wall of the measuring probe.

Images