Method and system for acquiring degassing efficiency of degasser

Abstract

The invention belongs to the technical field of special measuring instruments for petroleum, and discloses a method and a system for acquiring the degassing efficiency of a degasser. The method comprises the following steps: injecting a standard gas sample with a known concentration into a test liquid with a set temperature in a liquid storage device; performing gas-liquid separation on the test liquid injected with the standard gas sample through a degasser, supplying the separated gas to a chromatographic analyzer to collect the content of hydrocarbon gas in the separated gas, and monitoring the flow of a liquid outlet of the degasser at the same time; obtaining the dissolution rate of the standard gas sample in the test liquid at the set temperature; and calculating the degassing efficiency of the degasser at the set temperature based on the collected content of the hydrocarbon gas, the known concentration of the standard gas sample, the obtained dissolution rate of the standard gas sample in the test liquid at the set temperature, the monitored flow of the fluid outlet of the degasser and the sample gas inlet flow of the separated gas entering the chromatographic analyzer. According to the method and the system, the degassing efficiency of the degasser can be reliably evaluated.

Description

Technical Field

[0001] The invention belongs to the technical field of petroleum-specific measuring instruments, and in particular relates to a method and system for obtaining the degassing efficiency of a degasser. Background Art

[0002] As one of the primary instruments for field logging, the drilling fluid degasser plays an indispensable role in the gas detection and analysis system. Its presence and quality will directly affect the normal detection and analysis of the gas components and contents in the drilling fluid during the drilling process. The most critical technical indicator for evaluating the performance of a degasser is the degassing efficiency. The degassing efficiency refers to the ratio of the gas in the drilling fluid to the total gas content in the drilling fluid after the gas in the drilling fluid passes through the degasser. At present, except for the degasser, other primary instruments (sensors) in the comprehensive logging system have corresponding calibration or verification equipment to test their technical performance indicators. Although it is possible to determine whether the degasser can operate normally by measuring the power supply or gas supply source of the degasser, the rotation speed of the agitator motor or the pneumatic motor, there is no corresponding instrument to measure its degassing efficiency.

[0003] At present, there are two main methods to obtain the degassing efficiency of the degasser:

[0004] Method 1: Currently, there is no particularly reliable means to obtain the degassing efficiency of the degasser at the construction site. By injecting samples at the wellhead (a certain volume of standard gas with a known concentration, such as the commonly used, 100ml methane standard sample with a known concentration of 100%) at the air inlet of the degasser at the wellhead end, the corresponding gas measurement value is obtained at the collection end. This method is to obtain an empirical value through multiple sets of degasser tests (that is, the average value obtained from multiple sets of degasser tests is used as the standard value), and the degassing efficiency of the degasser is calculated based on the empirical value. Other degassers are tested in the same way. If the obtained value is consistent, it proves that the degasser is normal. If the obtained value is low, it means that the degassing efficiency of the degasser is low and the cause needs to be found. However, this method has limitations, large errors, and cannot accurately measure the degassing efficiency of a single degasser.

[0005] Method 2: The degassing efficiency calculation method is generally carried out through VMS, that is, a certain amount of drilling fluid is injected into the full degassing analyzer for high-temperature heating, and then a certain amount of gas in the drilling fluid is obtained, and then the obtained gas is injected into the chromatograph analyzer to detect the gas content, and compared with the real-time detection of the gas content of the drilling fluid, to obtain the corresponding multiple, so as to estimate the degassing efficiency of the degasser. However, this method has its limitations. It only detects one point, and the degassing efficiency value of the degasser is not obtained for a system. In addition, there are many factors affecting the degassing efficiency, and the key factors are not taken into account.

[0006] In view of this, there is an urgent need in the art for a more accurate and convenient method for obtaining the degassing efficiency of a degasser. Summary of the invention

[0007] In order to solve the above deficiencies in the prior art, the main purpose of the present invention is to provide a more accurate and convenient method and system for obtaining the degassing efficiency of a degasser.

[0008] According to a first aspect of the present invention, a method for obtaining degassing efficiency of a degasser is provided, which comprises the following steps:

[0009] Step S1: injecting a standard gas sample of known concentration into a test liquid at a predetermined temperature in a liquid storage device;

[0010] Step S2: performing gas-liquid separation on the test liquid injected with the standard gas sample through a degasser, supplying the separated gas to a chromatograph to collect the content of hydrocarbon gas in the separated gas, and monitoring the liquid outlet flow of the degasser at the same time;

[0011] Step S3: obtaining the dissolution rate of the standard gas sample in the test liquid at a predetermined temperature;

[0012] Step S4: Calculate the degassing efficiency of the degasser at a given temperature based on the collected hydrocarbon gas content, the known concentration of the standard gas sample, the solubility rate of the obtained standard gas sample in the test liquid at a given temperature, the monitored degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph.

[0013] According to some embodiments of the present invention, the method for obtaining the degassing efficiency of the gasifier further comprises the following steps:

[0014] Step S5: changing the temperature of the test liquid;

[0015] Step S6: injecting a standard gas sample of known concentration into the test liquid at the changed temperature;

[0016] Step S7: performing gas-liquid separation on the test liquid injected with the standard gas sample through a degasser, supplying the separated gas to a chromatograph to collect the content of hydrocarbon gas in the separated gas, and monitoring the liquid outlet flow of the degasser at the same time;

[0017] Step S8: obtaining the dissolution rate of the standard gas sample in the test liquid at the changed temperature;

[0018] Step S9: Calculate the degassing efficiency of the degasser at the changed temperature based on the collected hydrocarbon gas content, the known concentration of the standard gas sample, the solubility rate of the obtained standard gas sample in the test liquid at the changed temperature, the monitored degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph.

[0019] According to some embodiments of the present invention, the method for obtaining the degassing efficiency of a degasser further comprises the following steps:

[0020] Step S10: Repeat steps S5-S9 to obtain the degassing efficiency of the degasser within a certain temperature range.

[0021] According to some embodiments of the present invention, the method for obtaining the degassing efficiency of a degasser further comprises the following steps:

[0022] Step S11: outputting the obtained degassing efficiency of the degasser within a certain temperature range in the form of a calibration data table or a calibration curve.

[0023] According to some embodiments of the present invention, in step S3, the dissolution rate of the standard gas sample in the test liquid at a predetermined temperature is obtained through theoretical calculation or actual testing.

[0024] According to some embodiments of the present invention, in step S3, the dissolution rate of the standard gas sample in the test liquid at a predetermined temperature is obtained by the following actual test method:

[0025] Into a sealed container containing a certain volume of test liquid at a given temperature, continuously inject a standard gas sample, and monitor the volume increment of the test liquid as the amount of standard gas sample injected increases until the test liquid is saturated and the volume no longer changes. In this way, the dissolution rate of the standard gas sample in the test liquid at a given temperature that changes with the amount of standard gas sample injected is obtained.

[0026] According to some embodiments of the present invention, in step S4, the degassing efficiency of the degasser at a given temperature is calculated by the following formula:

[0027]

[0028] Where, η represents the degassing efficiency; C 色 Indicates the content of hydrocarbon gas in the separated gas collected by the chromatograph, %; Q 样 Indicates the sample inlet flow rate of the separated gas entering the chromatograph, mL / min; C 标 Indicates the known concentration of the standard gas sample, %; Q 液 It represents the outlet flow rate of the degasser liquid, mL / min; S represents the dissolution rate of the standard gas sample in the test liquid at a given temperature, %.

[0029] According to a second aspect of the present invention, a degasser degassing efficiency acquisition system is provided, comprising:

[0030] a liquid storage device containing a test liquid, the liquid storage device being provided with a degasser joint portion cooperating with a degasser to allow the degasser to separate gas from liquid in the test liquid in the liquid storage device;

[0031] A gas injection device, the gas injection device is used to inject a standard gas sample of known concentration into the test liquid in the liquid storage device;

[0032] a constant temperature control device, the constant temperature control device being used to control the temperature of the test liquid;

[0033] A stirring device, the stirring device is used to stir the test liquid;

[0034] A chromatograph, wherein the chromatograph is used to collect the content of hydrocarbon gas in the gas separated by the degasser;

[0035] A calculation device is provided for calculating the degassing efficiency of the degasser at a given temperature based on the content of hydrocarbon gas collected by the chromatograph, the known concentration of the standard gas sample, the solubility rate of the standard gas sample in the test liquid at a given temperature, the degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph.

[0036] According to some embodiments of the present invention, the degasser degassing efficiency acquisition system further includes:

[0037] A control device communicates with the gas injection device, the constant temperature control device, and the stirring device, and is used to control the gas injection operation of the gas injection device, control the operation of the constant temperature control device, and control the stirring operation of the test liquid.

[0038] According to some embodiments of the present invention, the constant temperature control device includes a heating device for heating the test liquid and a temperature detection device for detecting the temperature of the test liquid.

[0039] According to some embodiments of the present invention, the degasser degassing efficiency acquisition system further includes:

[0040] A liquid collecting device, the liquid collecting device is used to collect the liquid separated by the degasser;

[0041] A circulation pipeline for connecting the liquid storage device and the liquid collection device.

[0042] According to some embodiments of the present invention, the liquid storage device and the liquid collection device are configured as an integrated structure.

[0043] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0044] In the degasser degassing efficiency acquisition method of the present invention, a standard gas sample of known concentration is injected into a test liquid at a predetermined temperature, and a degasser is used to separate the gas and liquid of the test liquid into which the standard gas sample has been injected, and then the degassing efficiency of the degasser at a predetermined temperature is calculated based on the content of hydrocarbon gas in the separated gas collected by the chromatograph, the known concentration of the standard gas sample, the solubility rate of the obtained standard gas sample in the test liquid at a predetermined temperature, the monitored degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph. The method of the present invention takes into account the most critical factor affecting the degasser degassing efficiency—drilling fluid temperature—when acquiring the degassing efficiency, and obtains more reliable parameters relative to the formation.

[0045] The degassing efficiency acquisition method of the degasser provided by the present invention is simple and easy to operate, with high reliability, and can realize quantitative evaluation of the degassing efficiency of different degassers, thereby quantitatively correcting the real gas measurement values ​​of different hydrocarbon components, and can effectively improve the reliability and interpretation accuracy of gas measurement data; the degassing efficiency acquisition system of the degasser provided by the present invention is simple to set up, easy to operate, and can carry out degassing efficiency evaluation for specific degasser types under different environmental conditions (mainly temperature, and secondly drilling fluid density and viscosity), and has high applicability. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A flow chart of a method for obtaining degassing efficiency of a degasser provided in one embodiment of the present invention;

[0048] Figure 2 A flow chart of a method for obtaining degassing efficiency of a degasser provided by another embodiment of the present invention;

[0049] Figure 3 A block diagram of a system for acquiring degassing efficiency of a degasser provided by an embodiment of the present invention;

[0050] Figure 4 A schematic diagram of the structure of a degasser degassing efficiency acquisition system provided in one embodiment of the present invention. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0052] According to a first aspect of the present invention, a method for obtaining the degassing efficiency of a degasser is provided. Figure 1 As shown, in one embodiment, the method for obtaining the degassing efficiency of a degasser comprises the following steps:

[0053] Step S1: injecting a standard gas sample of known concentration into a test liquid at a predetermined temperature in a liquid storage device;

[0054] Step S2: performing gas-liquid separation on the test liquid injected with the standard gas sample through a degasser, supplying the separated gas to a chromatograph to collect the content of hydrocarbon gas in the separated gas, and monitoring the liquid outlet flow of the degasser at the same time;

[0055] Step S3: obtaining the dissolution rate of the standard gas sample in the test liquid at a predetermined temperature;

[0056] Step S4: Calculate the degassing efficiency of the degasser at a given temperature based on the content of the collected hydrocarbon gas, the known concentration of the standard gas sample, the solubility of the obtained standard gas sample in the test liquid at a given temperature, the monitored outlet flow rate of the degasser fluid, and the sample inlet flow rate of the separated gas entering the chromatograph. In this article, the standard gas sample is a gas sample with known component concentration produced by a unit authorized by relevant national agencies in accordance with certain standards. The standard gas sample used in the method of the present invention can be selected as needed. For example, a methane sample with a known concentration of 100% can be selected as the standard gas sample.

[0057] In this article, the test liquid is drilling fluid. There are many types of drilling fluids. Drilling fluid is a sol suspension system, and its components are mainly composed of three parts: ① Liquid phase: fresh water or brine, or special oil products. ② Solid phase: In order to increase the density of the drilling fluid, barite is often used. In order to improve rheology and filtration, microcrystalline kaolin is often used. ③ Treatment agent. Various organic or inorganic chemical treatment agents are commonly used to adjust the properties of the mud. Preferably, the actual drilling fluid of the target application scenario of the degasser can be selected as the test liquid, so as to increase the reliability of the degassing efficiency evaluation of the degasser and avoid the influence of different conditions such as drilling fluid viscosity and density on the degassing efficiency evaluation of the degasser.

[0058] In this article, "the solubility rate of the standard gas sample in the test liquid at a given temperature" refers to the volume of gas dissolved in 1 volume of the test liquid at a certain pressure and a given temperature. Its meaning is different from "solubility", which refers to the volume of gas dissolved in 1 volume of water at a pressure of 101kPa and a certain temperature to reach a saturated state. The method of the present invention does not require the injection of a standard gas sample of known concentration into the test liquid to reach a saturated state before degassing, mainly because the saturation state of the drilling fluid in the actual drilling construction project is uncertain, and calculating the degassing efficiency completely according to the saturated state may lead to deviations in the results.

[0059] In step S3, the dissolution rate of the standard gas sample in the test liquid at a given temperature can be obtained by theoretical calculation or actual test. The theoretical calculation can be a theoretical calculation performed by predecessors, and the corresponding dissolution rate can be directly obtained based on the theoretical calculation results of predecessors. The actual test can be carried out in the following manner: in a sealed container containing a certain volume of test liquid at a given temperature, the standard gas sample is continuously injected, and the volume increment of the test liquid as the standard gas sample injection amount increases (the liquid volume increment is the volume of the dissolved standard gas) is monitored, until the liquid is saturated and the volume no longer changes, thereby obtaining the dissolution rate of the standard gas sample in the test liquid at a given temperature that changes with the standard gas sample injection amount. For example, in a specific example, water is used as the test medium, and under constant conditions such as ambient temperature, a certain amount of gas is continuously injected into a sealed container containing a certain volume and with a scale, and the increase in liquid is obtained, until the liquid is saturated and the volume does not change, thereby obtaining the dissolution rate of the standard gas sample in the test liquid at a given temperature that changes with the standard gas sample injection amount, that is, the result obtained by the actual test is a relationship curve between the dissolution rate and the standard gas sample injection amount.

[0060] In step S4, the degassing efficiency of the degasser at a given temperature is calculated by the following formula:

[0061]

[0062] Where, η represents the degassing efficiency; C 色 Indicates the content of hydrocarbon gas in the separated gas collected by the chromatograph, %; Q 样 Indicates the sample inlet flow rate of the separated gas entering the chromatograph, mL / min; C 标 Indicates the known concentration of the standard gas sample, %; Q 液 It represents the outlet flow rate of the degasser liquid, mL / min; S represents the dissolution rate of the standard gas sample in the test liquid at a given temperature, %.

[0063] In the method of the present invention, it is assumed that the injection volume and concentration loss of the standard gas sample are approximately zero.

[0064] The derivation process of the above formula is as follows:

[0065] 1. Degasser efficiency = gas removal volume (mL / min) ÷ [degasser liquid outlet flow rate (mL / min) × gas dissolution rate (%)]

[0066] ① Degasser efficiency: The degassing efficiency of the degasser refers to the ability of the degasser to separate gas from drilling fluid.

[0067] ②Gas release amount: The amount of gas released from the drilling fluid by physical crushing when the degasser is in normal working condition.

[0068] ③ Degasser liquid outlet flow rate: the amount of drilling fluid discharged from the degasser outlet.

[0069] ④Gas solubility rate: the solubility rate of the standard gas sample in the test liquid at a given temperature.

[0070] 2. Gas release volume (mL / min) = Release gas occupancy (%) × sample inlet flow rate (mL / min)

[0071] ① Occupancy rate of escaped gas: the degree to which the escaped gas accounts for the sample intake air, that is, the percentage of the escaped gas in the sample intake air.

[0072] ② Sample inlet flow rate: The gas and air mixture released from the degasser is input into the chromatograph through the gas pipeline and enters the flow rate before entering the chromatograph analysis component.

[0073] 3. Escape gas occupancy rate (%) = chromatograph collection value (%) ÷ standard gas sample concentration (%)

[0074] ① Chromatograph collection value: the value obtained by the chromatograph analyzing the gas sample.

[0075] ② Standard concentration of gas samples: The concentration of standard gas samples produced in accordance with certain standards by units authorized by relevant national agencies.

[0076] Based on the above 1-3 items:

[0077] 4. Degasser efficiency (%) = chromatograph collection value (%) ÷ standard gas concentration (%) × sample inlet flow rate (mL / min) ÷ degasser liquid outlet flow rate (mL / min) ÷ gas dissolution rate (%)

[0078] The degassing efficiency of the degasser refers to the ratio of the amount of gas removed by the degasser (i.e., the amount of gas removed) to the total gas content in the drilling fluid. In the method of the present invention, the total gas content in the drilling fluid is calculated based on the degasser liquid outlet flow rate and the gas solubility rate.

[0079] The chromatograph acquisition value is the gas concentration value detected by the chromatograph through its own characteristics and a series of processes. In theory, if the chromatograph itself is zero error, the chromatograph acquisition value and the gas sample standard concentration value are consistent, but in the actual application process, the chromatograph itself has errors, and the errors here include the errors of the instrument itself (determined by the performance of the hardware and software itself), human errors (generated when people operate, such as the errors generated when calibrating the chromatograph), and the errors caused by the influence of the environment on the chromatograph, etc. These errors are required in industry standards or enterprise standards, as long as they meet the requirements of the standards, and these errors are not considered in the method of the present invention. The gas source entering the chromatograph analyzer has two parts, one of which is the gas escaping from the drilling fluid. When the gas escaping from the drilling fluid cannot meet the sample gas flow rate, it is necessary to supplement air from the outside. The chromatograph acquisition value is equivalent to the ratio of the escaping gas to the sample gas multiplied by the gas sample standard concentration, that is, the diluted gas standard concentration, [chromatograph acquisition value (%) ÷ gas sample standard concentration (%)], that is, the ratio of the escaping gas to the sample gas. In other words, in the method of the present invention, based on the gas dilution principle, the amount of gas degassing from the degasser (ie, the amount of gas degassing) is calculated according to the chromatograph acquisition value, the standard gas sample concentration, and the sample inlet flow rate.

[0080] In the method of the present invention, the degassing efficiency of the degasser is tested while the standard gas sample is injected into the test liquid, that is, the injection step and the test step are performed almost simultaneously, thereby obtaining a series of degassing efficiency values ​​of the degasser at a given temperature. When calculating each degassing efficiency value, the content of hydrocarbon gas collected at the corresponding time, the dissolution rate corresponding to the injection amount of the standard gas sample at the corresponding time, and the outlet flow rate of the degasser fluid monitored at the corresponding time are used.

[0081] like Figure 2 As shown, in some embodiments, the method for obtaining the degassing efficiency of the degasser further comprises the following steps:

[0082] Step S5: changing the temperature of the test liquid;

[0083] Step S6: injecting a standard gas sample of known concentration into the test liquid at the changed temperature;

[0084] Step S7: performing gas-liquid separation on the test liquid injected with the standard gas sample through a degasser, supplying the separated gas to a chromatograph to collect the content of hydrocarbon gas in the separated gas, and monitoring the liquid outlet flow of the degasser at the same time;

[0085] Step S8: obtaining the dissolution rate of the standard gas sample in the test liquid at the changed temperature;

[0086] Step S9: Calculate the degassing efficiency of the degasser at the changed temperature based on the collected hydrocarbon gas content, the known concentration of the standard gas sample, the solubility rate of the obtained standard gas sample in the test liquid at the changed temperature, the monitored degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph;

[0087] Step S10: Repeat steps S5-S9 to obtain the degassing efficiency of the degasser within a certain temperature range.

[0088] Among them, step S6 is similar to step S1, step S7 is similar to step S2, step S8 is similar to step S3, and step S9 is similar to step S4, which will not be described in detail here.

[0089] In the method of the present invention, the degassing efficiency of the degasser within a certain temperature range is obtained through test experiments at different temperatures, which is used to assist in the later interpretation of formation oil and gas displays.

[0090] In some embodiments, the degassing efficiency of the degasser within a certain temperature range obtained in step S10 is output in the form of a calibration data table or a calibration curve for use by the on-site operation team and gas measurement interpretation personnel.

[0091] According to a second aspect of the present invention, a system for obtaining degassing efficiency of a degasser is provided. Figure 3 As shown, the system comprises: a liquid storage device 1 filled with a test liquid, the liquid storage device 1 being provided with a degasser joint portion cooperating with a degasser to allow the degasser to separate gas and liquid from the test liquid in the liquid storage device; a gas injection device 2, the gas injection device 2 being used to inject a standard gas sample of known concentration into the test liquid in the liquid storage device 1; a constant temperature control device 3, the constant temperature control device 3 being used to control the temperature of the test liquid; a stirring device 4, the stirring device 4 being used to stir the test liquid; and a chromatograph 5, the chromatograph 5 being used to collect hydrocarbon gas in the gas separated by the degasser. a calculation device 6, which calculates the degassing efficiency of the degasser at a given temperature based on the content of hydrocarbon gas collected by the chromatograph, the known concentration of the standard gas sample, the solubility rate of the standard gas sample in the test liquid at a given temperature, the degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph; a control device 7, which communicates with the gas injection device 2, the constant temperature control device 3, and the stirring device 4, and is used to control the gas injection operation of the gas injection device 2, the temperature control operation of the constant temperature control device 3, and the stirring operation of the stirring device 4.

[0092] In some embodiments, the computing device 6 and the control device 7 may be integrated into one component. For example, the computing device 6 may be configured as a module in the control device.

[0093] In some embodiments, the degasser degassing efficiency acquisition system further includes: a liquid collecting device 8 for collecting liquid separated by the degasser; and a circulation pipeline 9 for connecting the liquid storage device 1 and the liquid collecting device 8 .

[0094] Figure 4 The schematic diagram of the structure of the degassing efficiency acquisition system of the degasser provided by one embodiment of the present invention is shown. As shown in the figure, in this embodiment, the liquid storage device 1 and the liquid collecting device 8 are arranged as an integrated structure. The integrated structure includes a main body and a cover portion sealed with the main body, the main body is provided with a gas injection device joint portion for sealing with the gas injection device 2, the cover portion is provided with a degassing device joint portion for sealing with the degassing device, a stirring device joint portion for sealing with the stirring device 4, a thermostatic control device joint portion for sealing with the thermostatic control device 3, and a liquid discharge port joint portion for sealing with the liquid discharge port of the degassing device. In the integrated structure, the liquid storage device 1 is located on one side (for example, the left side in the figure), the liquid collecting device 8 is located above the other side (for example, the right side in the figure), and the control device 7 is arranged below the liquid collecting device 8. Among them, the liquid storage device 1 implements zoning processing: the left side is the gas injection area, which can be injected with standard gas samples according to a predetermined pressure. Theoretically, the upper injection volume and concentration loss are approximately zero; the right side is the test area, in which the lower part has a stirring function (not shown) and a degasser is installed on the upper part. In the embodiment shown, the gas injection area and the test area are separated by a baffle portion that partially extends downward. The liquid released from the degasser enters the liquid collection device 8 and then returns to the liquid storage device 1 via the circulation pipeline. The gas released from the degasser can be transported to the gas injection device 2 via the circulation pipeline 9 (not shown in the figure). In this embodiment, the constant temperature control device 3 includes a heating device 31 for heating the test liquid and a temperature detection device 32 for detecting the temperature of the test liquid.

[0095] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention, including the combination of various technical features in any other appropriate manner, these simple variations and combinations should also be regarded as the contents disclosed by the present invention and should be included in the protection scope of the present invention.

Claims

1. A method for obtaining degassing efficiency of a degasser, characterized in that: The following steps are involved: Step S1: injecting a standard gas sample of known concentration into a test liquid at a predetermined temperature in a liquid storage device; Step S2: performing gas-liquid separation on the test liquid injected with the standard gas sample through a degasser, supplying the separated gas to a chromatograph to collect the content of hydrocarbon gas in the separated gas, and monitoring the liquid outlet flow of the degasser at the same time; Step S3: obtaining the dissolution rate of the standard gas sample in the test liquid at a predetermined temperature; Step S4: Calculate the degassing efficiency of the degasser at a given temperature based on the collected hydrocarbon gas content, the known concentration of the standard gas sample, the solubility rate of the obtained standard gas sample in the test liquid at a given temperature, the monitored degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph.

2. The method for obtaining the degassing efficiency of a degasser according to claim 1, characterized in that: It also includes the following steps: Step S5: changing the temperature of the test liquid; Step S6: injecting a standard gas sample of known concentration into the test liquid at the changed temperature; Step S7: performing gas-liquid separation on the test liquid injected with the standard gas sample through a degasser, supplying the separated gas to a chromatograph to collect the content of hydrocarbon gas in the separated gas, and monitoring the liquid outlet flow of the degasser at the same time; Step S8: obtaining the dissolution rate of the standard gas sample in the test liquid at the changed temperature; Step S9: Calculate the degassing efficiency of the degasser at the changed temperature based on the collected hydrocarbon gas content, the known concentration of the standard gas sample, the solubility rate of the obtained standard gas sample in the test liquid at the changed temperature, the monitored degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph.

3. The method for obtaining the degassing efficiency of a degasser according to claim 2, characterized in that: It also includes the following steps: Step S10: Repeat steps S5-S9 to obtain the degassing efficiency of the degasser within a certain temperature range.

4. The method for obtaining the degassing efficiency of a degasser according to claim 3, characterized in that: In step S10, the obtained degassing efficiency of the degasser within a certain temperature range is output in the form of a calibration data table or a calibration curve.

5. The method for obtaining the degassing efficiency of a degasser according to claim 1, characterized in that: In step S3, the dissolution rate of the standard gas sample in the test liquid at a predetermined temperature is obtained through theoretical calculation or actual testing.

6. The method for obtaining the degassing efficiency of a degasser according to claim 5, characterized in that: In step S3, the dissolution rate of the standard gas sample in the test liquid at a predetermined temperature is obtained by the following actual test method: Into a sealed container containing a certain volume of test liquid at a given temperature, continuously inject a standard gas sample, and monitor the volume increment of the test liquid as the amount of standard gas sample injected increases until the test liquid is saturated and the volume no longer changes. In this way, the dissolution rate of the standard gas sample in the test liquid at a given temperature that changes with the amount of standard gas sample injected is obtained.

7. The method for obtaining the degassing efficiency of a degasser according to claim 1, characterized in that: In step S4, the degassing efficiency of the degasser at a given temperature is calculated by the following formula: Where, η represents the degassing efficiency; C 色 Indicates the content of hydrocarbon gas in the separated gas collected by the chromatograph, %; Q 样 Indicates the sample inlet flow rate of the separated gas entering the chromatograph, mL / min; C 标 Indicates the known concentration of the standard gas sample, %; Q 液 It represents the outlet flow rate of the degasser liquid, mL / min; S represents the dissolution rate of the standard gas sample in the test liquid at a given temperature, %.

8. A degasser degassing efficiency acquisition system, characterized in that: include: a liquid storage device containing a test liquid, the liquid storage device being provided with a degasser joint portion cooperating with a degasser to allow the degasser to separate gas from liquid in the test liquid in the liquid storage device; A gas injection device, the gas injection device is used to inject a standard gas sample of known concentration into the test liquid in the liquid storage device; a constant temperature control device, the constant temperature control device being used to control the temperature of the test liquid; A stirring device, the stirring device is used to stir the test liquid; A chromatograph, wherein the chromatograph is used to collect the content of hydrocarbon gas in the gas separated by the degasser; A calculation device is provided for calculating the degassing efficiency of the degasser at a given temperature based on the content of hydrocarbon gas collected by the chromatograph, the known concentration of the standard gas sample, the solubility rate of the standard gas sample in the test liquid at a given temperature, the degasser fluid outlet flow rate, and the sample inlet flow rate of the separated gas entering the chromatograph.

9. The degasser degassing efficiency acquisition system according to claim 8, characterized in that: Also includes: A control device communicates with the gas injection device, the constant temperature control device, and the stirring device, and is used to control the gas injection operation of the gas injection device, control the operation of the constant temperature control device, and control the stirring operation of the test liquid.

10. The degasser degassing efficiency acquisition system according to claim 8, characterized in that: The constant temperature control device comprises a heating device for heating the test liquid and a temperature detection device for detecting the temperature of the test liquid.

11. The degasser degassing efficiency acquisition system according to claim 8, characterized in that: Also includes: A liquid collecting device, the liquid collecting device is used to collect the liquid separated by the degasser; A circulation pipeline for connecting the liquid storage device and the liquid collection device.

12. The degasser degassing efficiency acquisition system according to claim 11, characterized in that: The liquid storage device and the liquid collection device are arranged as an integrated structure.

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