Detection device and detection method for oil well scale sample

Abstract

The invention relates to the technical field of oil and gas field development, and discloses a detection device and method for an oil well scale sample, and the detection device comprises a first detection container which is used for placing a scale sample, and is internally provided with a first form detector and a magnetic part; the second detection container is communicated with the first detection container, so that the scale sample detected by the first detection container enters the second detection container; wherein a second form detector and a stirrer are arranged in the second detection container; the outlet ends of the plurality of reagent containers are respectively communicated with the second detection container; and the outlet end of the second detection container is communicated with the collection container. The method can quickly judge the components of the scale sample without large equipment and instrument detection, realizes quick qualitative analysis of the oil well scale sample, and has the advantages of simple, quick and convenient operation, wide application range and the like.

Description

Technical Field

[0001] The present application relates to the technical field of oil and gas field development, for example, to a detection device and method for oil well scale samples. Background Art

[0002] Currently, during oil and gas field development, fluids trapped in bottomhole reservoirs must be developed from the oil and gas formations to the surface. For example, this involves moving oil and gas from the bottomhole through the wellbore and wellhead to surface gathering pipelines. However, due to changes in oil and gas field production processes, production media can impact production equipment and facilities. For example, if the temperature, pressure, and oil-gas balance within the wellbore fluctuate continuously, fluid impurities, suspended matter, and particles introduced during fluid development can form scale or deposit within the wellbore, leading to wall scaling.

[0003] On the other hand, the high production rate of oil and gas fields causes the pressure of oil and gas layers to drop, necessitating water injection to replenish formation energy and thus increase oil and gas recovery rates. However, the water source for water injection is often surface water, produced water, etc., which is reinjected for secondary injection. The water quality of the reinjected water contains high chloride ions, salinity, and scaling ions, which can cause serious scaling problems in surface pipelines and downhole tubing. This can lead to blockages, perforations, and leaks in the water injection system pipelines, causing oil and gas facilities to be unable to operate continuously or even shut down. Therefore, it seriously affects the efficiency of oil and gas extraction.

[0004] To address these issues, it's necessary to analyze on-site scale samples, identify the type of scaling, and develop a reasonable prevention and control plan. Currently, this typically involves analyzing the scale formation mechanism based on downhole processes and related laboratory testing to determine the composition and content of the scale. This typically requires the use of large-scale testing and analysis equipment, resulting in long testing cycles, heavy workload, and cumbersome operations. Summary of the Invention

[0005] The present application provides a detection device and method for oil well scale samples, which can quickly determine the composition of the scale samples without the need for large-scale equipment and instrument detection, and realize rapid qualitative analysis of the oil well scale samples. It has the advantages of simple, fast, convenient operation and wide applicability.

[0006] A first embodiment of the present application provides a device for detecting oil well scale samples, comprising:

[0007] A first detection container is used to place a scale sample, and a first morphological detector and a magnetic element are also provided therein;

[0008] A second detection container is connected to the first detection container so that the scale sample detected by the first detection container enters the second detection container; wherein a second morphology detector and a stirrer are provided in the second detection container;

[0009] a plurality of reagent containers, wherein outlet ends of the plurality of reagent containers are respectively connected to the second detection container;

[0010] A collecting container, wherein the outlet end of the second detection container is communicated with the collecting container.

[0011] Optionally, in one embodiment of the present application, the multiple reagent containers include a first reagent container, a second reagent container and a third reagent container; the first reagent container, the second reagent container and the third reagent container are connected to the second detection container through a pump body; and a liquid level sensor is provided in each of the reagent containers; wherein, the first reagent container contains a first detection liquid for detecting the scale sample, the second reagent container contains a second detection liquid for detecting the scale sample, and the third reagent container contains a third detection liquid for detecting the scale sample.

[0012] Optionally, in one embodiment of the present application, the method further includes:

[0013] The gas reagent container is connected to the first detection container through a gas pipeline, and a flow control valve is provided on the gas pipeline.

[0014] Optionally, in one embodiment of the present application, the outlet end of the detection container includes a gas outlet end, and further includes:

[0015] an alarm, disposed at the gas outlet end of the second detection container;

[0016] The sensor is arranged at the gas outlet end of the second detection container to monitor the bubbles at the gas outlet end.

[0017] Optionally, in one embodiment of the present application, the outlet end of the detection container further includes a liquid outlet end; and further includes:

[0018] a filter, disposed at the liquid outlet end of the second detection container;

[0019] A hardness detector is provided on the filter;

[0020] A solenoid valve is provided on the communication pipeline between the second detection container and the first detection container;

[0021] The controller is communicatively connected with the first form detector, the magnetic component, the pump body, the electromagnetic valve, the second form detector, the stirrer, the flow control valve, the alarm and the sensor respectively.

[0022] Optionally, in one embodiment of the present application, the first detection container, the second detection container, the reagent container, the collection container and the gas reagent container are all made of transparent materials.

[0023] Optionally, in one embodiment of the present application, the first detection liquid is distilled water, the second detection liquid is HCl with a concentration of 15%, the third detection liquid is H2SO4, and the treatment liquid is NaOH.

[0024] A second embodiment of the present application provides a method for detecting oil well scale samples, comprising:

[0025] Pre-treat the scale sample and place it into the detection container;

[0026] Determining the type of the scale sample according to the appearance color of the scale sample includes:

[0027] When the color of the scale sample is brown or tan, it is determined that the scale sample is an oxide containing Fe;

[0028] When the color of the scale sample is black or grayish black, it is determined that the scale sample is a precipitate containing Fe;

[0029] When the color of the scale sample is white or off-white, it is determined that the scale sample is salt sediment;

[0030] adding a first detection liquid to the detection container;

[0031] When the color of the scale sample is white or off-white and the scale sample is soluble in the first detection liquid, it is determined that the scale sample is NaCl.

[0032] Optionally, in one embodiment of the present application, when the color of the scale sample is brown or tan, determining that the scale sample is an oxide containing Fe further includes:

[0033] When the scale sample is not dissolved in the first detection liquid, adsorbing the scale sample by a magnet;

[0034] When the scale sample is attracted by the magnet, it is determined that the scale sample is Fe 3 O 4 or a sediment containing Fe 3 O 4 .

[0035] When the scale sample is dissolved in the first detection liquid, the first detection liquid is discharged and a second detection liquid is added into the detection container;

[0036] When the scale sample is dissolved in the second detection liquid without generating bubbles and the solution gradually turns yellow, it is determined that the scale sample is Fe 2 O 3 .

[0037] Optionally, in one embodiment of the present application, when the color of the scale sample is black or grayish black, determining that the scale sample is a precipitate containing Fe further includes:

[0038] If the scale sample is not dissolved in the first detection liquid, draining the first detection liquid and adding a second detection liquid into the detection container;

[0039] When the scale sample dissolves in the second detection liquid and generates bubbles and odor, it is determined that the scale sample is FeS.

[0040] Optionally, in one embodiment of the present application, when the color of the scale sample is white or off-white, determining that the scale sample is a salt deposit further includes:

[0041] If the scale sample is not dissolved in the first detection liquid, draining the first detection liquid and adding a second detection liquid into the detection container;

[0042] When the scale sample is dissolved in the second detection liquid and bubbles are generated at a first rate, it is determined that the scale sample is CaCO 3 or MgCO 3 .

[0043] Optionally, in one embodiment of the present application, determining whether the scale sample is CaCO3 or MgCO3 includes:

[0044] draining the second detection liquid and adding the third detection liquid into the detection container;

[0045] When the scale sample is dissolved in the third detection liquid, the scale sample is determined to be MgCO 3 ; when the scale sample is not dissolved in the third detection liquid, the scale sample is determined to be CaCO 3 .

[0046] Optionally, in one embodiment of the present application, when the scale sample is not dissolved in the first detection liquid, after draining the first detection liquid and adding the second detection liquid into the detection container, the method further includes:

[0047] When the scale sample is dissolved in the second detection liquid, bubbles are generated at a second rate, and the solution gradually turns yellow, the scale sample is determined to be FeCO3;

[0048] When the scale sample is dissolved in the second detection solution, the solution slowly dissolves without changing color, and the scale sample is determined to be Mg(OH)2.

[0049] Optionally, in one embodiment of the present application, after determining that the scale sample is a salt deposit, the method further includes:

[0050] adding a second detection liquid into the detection container;

[0051] When the scale sample is dissolved in the second detection liquid, determining that the scale sample is NaCl crystals or sediment containing NaCl crystals;

[0052] In the case that the scale sample is not dissolved in the second detection liquid, it is determined that the scale sample is gypsum, BaSO 4 , SrSO 4 precipitate, sandstone and / or formation debris.

[0053] Optionally, in one embodiment of the present application, when the scale sample is not dissolved in the second detection liquid, determining that the scale sample is gypsum, BaSO4, SrSO4 precipitate, sandstone and / or formation debris includes:

[0054] determining the hardness and crystal size of the scale sample;

[0055] When the hardness of the scale sample is a first hardness and the crystal size is a first size, determining that the scale sample is soft gypsum;

[0056] When the hardness of the scale sample is the second hardness and the crystal size is the first size, determining that the scale sample is anhydrite;

[0057] When the hardness of the scale sample is the second hardness and the crystal size is the second size, determining that the scale sample is BaSO4 or SrSO4 precipitate;

[0058] When the hardness of the scale sample is the second hardness and the crystal size is the first size, it is determined that the scale sample is sandstone or formation debris.

[0059] Optionally, in one embodiment of the present application, pre-processing the scale sample includes:

[0060] Take out the scale sample to be tested;

[0061] Cleaning the scale sample to be detected by using an organic solvent;

[0062] Dry the cleaned scale sample.

[0063] The detection device and method for oil well scale samples provided in the embodiments of the present disclosure can achieve the following technical effects:

[0064] For the scale samples collected on site, samples are taken on site and placed in a detection container, wherein the outlet ends of multiple reagent containers are respectively connected to the detection container, and the outlet ends of the detection container are respectively connected to the collection container. In this way, by adding the corresponding reagents, the qualitative component analysis of the scale samples on site can be quickly achieved without the help of other large-scale detection equipment and instruments, and the purpose of rapid component analysis of complex scale samples can be achieved through simple operation procedures and intuitive chemical reaction judgments. In addition, the detection combined with portable intelligent devices is highly feasible and can more accurately identify the scale samples on site. It can alleviate or solve problems such as blockage, corrosion, and leakage caused by scaling for on-site identification of scale sample types and formulation of descaling or anti-scaling measures. This overcomes the influence of the detection cycle, detection instruments, and equipment on conventional scale sample analysis methods, helps to quickly and qualitatively determine the scale sample type on site, and greatly improves the efficiency of scale sample analysis.

[0065] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0067] Figure 1 The present invention provides a device for detecting oil well scale samples.

[0068] Figure 2 This is a process for detecting oil well scale samples provided by the embodiment of the present disclosure. Figure 1 ;

[0069] Figure 3 This is a process for detecting oil well scale samples provided by the embodiment of the present disclosure. Figure 2 . DETAILED DESCRIPTION

[0070] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0071] Combine Figure 1As shown, the first embodiment of the present application provides a detection device for oil well scale samples, including: a first detection container 10, used to place the scale sample, and further provided with a first form detector 11 and a magnetic member 12; a second detection container 20, connected to the first detection container 10, so that the scale sample after detection by the first detection container 10 enters the second detection container 20; wherein the second detection container 20 is provided with a second form detector 21 and a stirrer 22; a plurality of reagent containers 30, the outlet ends of the plurality of reagent containers 30 are respectively connected to the second detection container 20; and a collection container 40, the outlet end of the second detection container 20 is connected to the collection container 40.

[0072] The detection device for oil well scale samples provided by the embodiment of the present disclosure is used. For the scale samples collected on site, samples are taken on site and placed in a detection container, wherein the outlet ends of multiple reagent containers are respectively connected to the detection container, and the outlet ends of the detection container are respectively connected to the collection container. In this way, by adding corresponding reagents, the qualitative component analysis of the scale samples on site can be quickly achieved without the help of other large-scale detection equipment and instruments, and the purpose of rapid component analysis of complex scale samples can be achieved through simple operation procedures and intuitive chemical reaction judgments. In addition, the detection is combined with a portable intelligent device, which is highly feasible and can more accurately identify the scale samples on site. It can alleviate or solve problems such as blockage, corrosion, and leakage caused by scaling for on-site identification of scale sample types and formulation of descaling or anti-scaling measures. This overcomes the influence of the detection cycle, detection instruments, and equipment on conventional scale sample analysis methods, helps to quickly and qualitatively determine the scale sample type on site, and greatly improves the efficiency of scale sample analysis.

[0073] Optionally, in one embodiment of the present application, the device further comprises: a gas reagent container 50 connected to the first detection container 10 via a gas pipeline, and a flow control valve 51 is provided on the gas pipeline so that nitrogen can be injected into the first detection container 10.

[0074] Optionally, in one embodiment of the present application, the outlet of the second detection container 20 includes a gas outlet 23 and further includes: an alarm 60 disposed at the gas outlet 23 of the second detection container 20; the alarm 60 is a hydrogen sulfide alarm, which enables timely initiation of the recovery process to identify and recover the reactant gas. A sensor 70 is disposed at the gas outlet 23 of the second detection container 20 to monitor bubbles at the gas outlet 23. The sensor 70 is an ultrasonic bubble sensor.

[0075] Optionally, in one embodiment of the present application, the outlet end of the second detection container 20 also includes a liquid outlet end 24; and further includes: a filter 80, arranged at the liquid outlet end 24 of the second detection container 20; a hardness detector 81, arranged on the filter 80; a solenoid valve 13 is arranged on the connecting pipe between the second detection container 20 and the first detection container 10; and a controller 100, which is respectively communicated with the first form detector 11, the magnetic part 12, the pump body 31, the solenoid valve 13, the second form detector 21, the agitator 22, the flow control valve 51, the alarm 60 and the sensor 70.

[0076] Optionally, in one embodiment of the present application, during the detection process, data from the first form detector 11, the magnetic part 12, the pump body 31, the solenoid valve 13, the second form detector 21, the agitator 22, the flow control valve 51, the alarm 60 and the sensor 70 are communicated with the controller 100 through respective test wires.

[0077] In some embodiments, the filter 80 includes a heating assembly and a filter screen, and the heating assembly heats the filter screen to dry the scale sample. This allows the test liquid in the second test container 20 to be discharged through the liquid outlet 24 of the second test container 20. Simultaneously, a hardness detector 81 detects the hardness of the scale sample in the filter 80. Furthermore, the filter 80 can be removed and the scale sample can be removed for observation and analysis.

[0078] In some embodiments, the first detection container 10 is provided with an inlet for inserting a scale sample, and the scale sample is inserted into the first detection container 10 through the inlet. A first shape detector 11 and a magnetic element 12 are provided in the first detection container 10. The first shape detector 11 is an optical sensor that determines the shape and color of the scale sample. The magnetic element 12 is an electromagnetic sensor that can determine the magnetism of the scale sample.

[0079] In some embodiments, after passing through the first detection container 10, the scale sample can enter the second detection container 20. The outlet ends of the plurality of reagent containers 30 are respectively connected to the second detection container 20, so that the detection liquid in the reagent container 30 flows into the second detection container 20. The outlet ends of the second detection container 20 are respectively connected to the collection container 40, so that the waste liquid or waste gas generated by the second detection container 20 flows into the collection container 40 for treatment.

[0080] Optionally, in one embodiment of the present application, the first detection container 10, the second detection container 20, the reagent container 30, the collection container 40, and the gas reagent container 50 are all made of transparent materials. This allows for the continuous observation of the reaction process, liquid color, and sedimentation. The transparent material includes fiberglass.

[0081] Optionally, in one embodiment of the present application, the plurality of reagent containers 30 include a first reagent container, a second reagent container, and a third reagent container; each of the first, second, and third reagent containers is connected to the second detection container 20 via a pump 31; and each of the reagent containers 30 is provided with a liquid level sensor 32. To detect the liquid level within the reagent container 30, the liquid level sensor 32 is a conductivity test probe installed within the reagent container 30, with the end of the liquid level sensor 32 in contact with the interface of the guaranteed solution.

[0082] Optionally, the first reagent container contains a first detection liquid for detecting the scale sample, wherein the first detection liquid is distilled water. Thus, the composition of the scale sample can be determined by determining whether the scale sample dissolves in the first detection liquid. Here, the cleaned scale sample is added to the first reagent container, and the pump body 31 is turned on, allowing the first detection liquid to contact the scale sample and undergo a dissolution reaction.

[0083] Optionally, the second reagent container contains a second test liquid for testing the scale sample, wherein the second test liquid is 15% HCl. Thus, the composition of the scale sample can be determined by determining whether the scale sample dissolves in the second test liquid. Here, the pump body 31 is opened to discharge the test liquid from the second test container 20 through the liquid outlet 24 of the second test container 20. The pump body 31 is then opened to add hydrochloric acid from the second reagent container to the second test container 20, causing the scale sample to dissolve and react with the hydrochloric acid. At this point, the control valve at the gas outlet 23, which serves as an exhaust valve, is opened. When hydrogen sulfide is detected at the gas outlet 23, the alarm 60 responds.

[0084] Optionally, the third reagent container contains a third test liquid for testing the scale sample. The third test liquid is H2SO4. Thus, the composition of the scale sample can be determined by determining whether the scale sample dissolves in the third test liquid. Here, the pump body 31 is opened to discharge the test liquid from the second test container 20 through the liquid outlet port 24 of the second test container 20. When the pump body 31 is opened, sulfuric acid enters the second test container 20 to react with the scale sample; the gas flows out through the gas outlet port 23 and enters the collection container 40 for CO2 / H2S waste gas recovery.

[0085] In some specific embodiments, the cleaned scale sample is added to the first detection container 10, the magnetic part 12 and the first morphology detector 11 are turned on by the controller 100, the magnetism of the scale sample is determined by the magnetic part 12, and the morphology and color of the scale sample are determined by the first morphology detector 11.

[0086] In some specific embodiments, the flow control valve 51 is opened, and the solenoid valve 13 is opened at the same time, and the nitrogen in the gas reagent container 50 enters the first detection container 10, blowing the scale sample into the second detection container 20; the pump body 31 is controlled by the controller 100 to add distilled water, hydrochloric acid and sulfuric acid; the agitator 22 controls the reaction degree of the medium; the second morphology detector 21 monitors the change in solution color and the morphology of the scale sample; the filter 80 is opened, and the post-reaction solution is discharged into the collection container 40 through the liquid outlet end 24, and the scale sample is dried after exiting the filter 80, and the hardness detector 81 is used to detect the hardness of the dried sample, and the data is transmitted back to the controller 100 via the connecting wire.

[0087] In some specific embodiments, the gas enters the collection container 40 through the gas outlet port 23 for CO2 / H2S waste gas recovery; an alarm 60 and a sensor 70 are installed on the gas outlet port 23 to transmit the monitored data back to the controller 100 via connecting wires.

[0088] Optionally, in one embodiment of the present application, the liquid in the collection container 40 can be adjusted and replaced as needed, and corresponding liquid filling ports and liquid discharge ports are provided on the collection container 40 .

[0089] Combine Figure 2 and Figure 3 As shown, the second embodiment of the present application provides a method for detecting oil well scale samples, comprising:

[0090] S101, pre-treating the scale sample and placing it into a detection container;

[0091] S102: Determining the type of the scale sample according to the appearance color of the scale sample, which includes:

[0092] When the color of the scale sample is brown or tan, it is determined that the scale sample is an oxide containing Fe;

[0093] When the color of the scale sample is black or grayish black, it is determined that the scale sample is a precipitate containing Fe;

[0094] When the color of the scale sample is white or off-white, it is determined that the scale sample is salt sediment;

[0095] S103, adding a first detection liquid to the detection container;

[0096] S104 : When the color of the scale sample is white or off-white and the scale sample is soluble in the first detection liquid, determine that the scale sample is NaCl.

[0097] Optionally, in one embodiment of the present application, when the color of the scale sample is brown or tan, determining that the scale sample is an oxide containing Fe further includes:

[0098] When the scale sample is not dissolved in the first detection liquid, adsorbing the scale sample by a magnet;

[0099] When the scale sample is attracted by the magnet, it is determined that the scale sample is Fe 3 O 4 or a sediment containing Fe 3 O 4 .

[0100] When the scale sample is dissolved in the first detection liquid, the first detection liquid is discharged and a second detection liquid is added into the detection container;

[0101] When the scale sample is dissolved in the second detection liquid without generating bubbles and the solution gradually turns yellow, it is determined that the scale sample is Fe 2 O 3 .

[0102] Optionally, in one embodiment of the present application, when the color of the scale sample is black or grayish black, determining that the scale sample is a precipitate containing Fe further includes:

[0103] If the scale sample is not dissolved in the first detection liquid, draining the first detection liquid and adding a second detection liquid into the detection container;

[0104] When the scale sample dissolves in the second detection liquid and generates bubbles and odor, it is determined that the scale sample is FeS.

[0105] Optionally, in one embodiment of the present application, when the color of the scale sample is white or off-white, determining that the scale sample is a salt deposit further includes:

[0106] If the scale sample is not dissolved in the first detection liquid, draining the first detection liquid and adding a second detection liquid into the detection container;

[0107] When the scale sample is dissolved in the second detection liquid and bubbles are generated at a first rate, it is determined that the scale sample is CaCO 3 or MgCO 3 .

[0108] Optionally, in one embodiment of the present application, determining whether the scale sample is CaCO3 or MgCO3 includes:

[0109] draining the second detection liquid and adding the third detection liquid into the detection container;

[0110] When the scale sample is dissolved in the third detection liquid, the scale sample is determined to be MgCO 3 ; when the scale sample is not dissolved in the third detection liquid, the scale sample is determined to be CaCO 3 .

[0111] Optionally, in one embodiment of the present application, when the scale sample is not dissolved in the first detection liquid, after draining the first detection liquid and adding the second detection liquid into the detection container, the method further includes:

[0112] When the scale sample is dissolved in the second detection liquid, bubbles are generated at a second rate, and the solution gradually turns yellow, the scale sample is determined to be FeCO3;

[0113] When the scale sample is dissolved in the second detection solution, the solution slowly dissolves without changing color, and the scale sample is determined to be Mg(OH)2.

[0114] Optionally, in one embodiment of the present application, after determining that the scale sample is a salt deposit, the method further includes:

[0115] adding a second detection liquid into the detection container;

[0116] When the scale sample is dissolved in the second detection liquid, determining that the scale sample is NaCl crystals or sediment containing NaCl crystals;

[0117] In the case that the scale sample is not dissolved in the second detection liquid, it is determined that the scale sample is gypsum, BaSO 4 , SrSO 4 precipitate, sandstone and / or formation debris.

[0118] Optionally, in one embodiment of the present application, when the scale sample is not dissolved in the second detection liquid, determining that the scale sample is gypsum, BaSO4, SrSO4 precipitate, sandstone and / or formation debris includes:

[0119] determining the hardness and crystal size of the scale sample;

[0120] When the hardness of the scale sample is a first hardness and the crystal size is a first size, determining that the scale sample is soft gypsum;

[0121] When the hardness of the scale sample is the second hardness and the crystal size is the first size, determining that the scale sample is anhydrite;

[0122] When the hardness of the scale sample is the second hardness and the crystal size is the second size, determining that the scale sample is BaSO4 or SrSO4 precipitate;

[0123] When the hardness of the scale sample is the second hardness and the crystal size is the first size, it is determined that the scale sample is sandstone or formation debris.

[0124] Optionally, in one embodiment of the present application, pre-processing the scale sample includes:

[0125] Take out the scale sample to be tested;

[0126] Cleaning the scale sample to be detected by using an organic solvent;

[0127] Dry the cleaned scale sample.

[0128] In some specific embodiments, a certain oil well pipe is severely scaled, and internal scaling products are taken out from the oil pipe at the site. The well has a large water production and a high salinity of the water. The scale inside the downhole oil pipe is severely scaled, resulting in pipe blockage. The scale samples inside the oil pipe are quickly tested and analyzed on site to determine the type of scaling.

[0129] The scale sample is cleaned with an organic solvent such as gasoline or petroleum ether and dried by air. The scale sample is observed macroscopically to be a grayish-white block mixed with black particles. The block solid is dissolved in the first detection liquid; after stirring, the block material does not dissolve and continues to settle at the bottom of the second detection container 20.

[0130] When the second test solution was added to the second test container 20, a large number of bubbles appeared in the container, but no hydrogen sulfide warning or other odors were detected, and the solution color did not change, indicating that the scale sample was likely MgCO3 or CaCO3. However, some white and black particles were still precipitated at the bottom of the second test container 20. These particles were relatively fine, indicating the presence of BaSO4 in the oil pipe scale sample.

[0131] When the third detection liquid is added to the second detection container 20, the scale sample is partially dissolved, but some precipitation still exists. In this case, two types of scale, MgCO3 and CaCO3, exist in the scale sample.

[0132] On this basis, in order to prove the accuracy of on-site rapid qualitative detection, the scale samples were retrieved and subjected to XRD and EDS tests in the laboratory, which confirmed that the scale sample components were BaSO4, CaCO3, and MgCO3, which were consistent with the on-site rapid analysis type.

[0133] In some specific embodiments, a large amount of scale is generated inside a certain oil well pipe, and a scale sample is taken from the inside of the on-site oil well for rapid analysis and judgment to determine the type of scale in the oil well.

[0134] The scale sample was cleaned with an organic solvent such as gasoline or petroleum ether and dried by air. The scale sample was observed to be black and reddish-brown lumps and powder. The scale sample was dissolved in the first test solution and stirred. The scale sample did not dissolve.

[0135] The magnetism of the scale sample was tested with a magnet. Some reddish-brown powder and lumps were adsorbed on the surface of the magnet, indicating that Fe3O4 existed in the scale sample, and there may also be some iron filings.

[0136] When the second test solution is added to the second test container 20, bubbles form in the container and the alarm sounds, indicating the formation of H2S. Therefore, FeS is present in the scale sample. Simultaneously, the solution in the second test container 20 quickly turns yellow, indicating the presence of Fe2O3 and FeCO3.

[0137] Laboratory XRD and EDS tests on the on-site scale samples revealed the composition of Fe, Fe₃O₄, Fe₂O₃FeCO₃, and FeS. The laboratory detailed analysis results were consistent with the on-site rapid test results.

[0138] In the disclosed embodiments, the method is applicable to the analysis of scale samples from wellbores or surface pipelines in oil or gas fields. It is also generally applicable to scale samples from pipelines in other industrial fields, such as thermal systems, drainage pipe systems, cooling water systems, air conditioning systems, and heat exchangers. This means that the method is not limited to laboratory testing but can be performed on-site in oil and gas fields.

[0139] In the disclosed embodiment, the composition of the scale sample is determined by intuitively monitoring the solubility, color change and other characteristics of the scale sample through cleaning and chemical reaction. The operating principle is simple and clear, and the on-site operability is stronger.

[0140] In the disclosed embodiments, the method does not require a large amount of testing and analysis equipment, avoiding complex qualitative analysis and characterization. The analysis process can be performed on-site in the oil and gas field, which is fast and convenient. That is, the testing equipment required for this method is simple. This method is highly timely, avoiding the possibility of inaccurate later testing and analysis due to imperfect storage of scale samples or deterioration of scale samples during transportation. In this way, on-site testing and analysis are performed immediately using the simplest operating method, ensuring the accuracy and rationality of the test results.

[0141] In addition, this method is highly operational and feasible on site. Compared with the operating specifications and complex operating procedures of large laboratory equipment, this method and the corresponding intelligent detection device can quickly analyze and display the analysis results, with convenient operation and high analysis efficiency.

[0142] In summary, the detection method for oil well scale samples provided in this application can quickly, conveniently, objectively and systematically analyze all components in complex scale samples, reduce the detection workload, shorten the detection cycle, improve analysis efficiency, and provide help and guidance for on-site prevention and control of oil and gas field scale, thereby reducing the large amount of loss and waste of manpower and material resources in the detection and analysis of oil and gas well scale samples, and ensuring the safe and efficient operation of the oil and gas development system.

[0143] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0144] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0145] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing a custom logical function or process step, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed in a different order than shown or discussed, including performing functions in a substantially simultaneous manner or in a reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0146] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A detection device for oil well scale samples, characterized in that: include: A first detection container (10) is used to place a scale sample, and is further provided with a first morphological detector (11) and a magnetic element (12); a second detection container (20) connected to the first detection container (10) so that the scale sample detected by the first detection container (10) enters the second detection container (20); wherein a second morphology detector (21) and a stirrer (22) are provided in the second detection container (20); a plurality of reagent containers (30), wherein outlet ends of the plurality of reagent containers (30) are respectively connected to the second detection container (20); A collecting container (40), wherein the outlet end of the second detection container (20) is in communication with the collecting container (40).

2. The detection device for oil well scale samples according to claim 1, characterized in that: The multiple reagent containers (30) include a first reagent container, a second reagent container and a third reagent container; the first reagent container, the second reagent container and the third reagent container are connected to the second detection container (20) through a pump body (31); and each reagent container (30) is respectively provided with a liquid level sensor (32); wherein the first reagent container contains a first detection liquid for detecting the scale sample, the second reagent container contains a second detection liquid for detecting the scale sample, and the third reagent container contains a third detection liquid for detecting the scale sample.

3. The detection device for oil well scale samples according to claim 2, characterized in that: Also includes: The gas reagent container (50) is connected to the first detection container (10) through a gas pipeline, and a flow control valve (51) is provided on the gas pipeline.

4. The detection device for oil well scale samples according to claim 3, characterized in that: The outlet end of the detection container (20) includes a gas outlet end (23), and further includes: an alarm (60) disposed at the gas outlet end (23) of the second detection container (20); A sensor (70) is provided at the gas outlet end (23) of the second detection container (20) to monitor bubbles at the gas outlet end (23).

5. The detection device for oil well scale samples according to claim 4, characterized in that: The outlet end of the detection container (20) further includes a liquid outlet end (24); and further includes: a filter (80) disposed at the liquid outlet end (24) of the second detection container (20); a hardness detector (81), disposed on the filter (80); A solenoid valve (13) is provided on the communication pipeline between the second detection container (20) and the first detection container (10); The controller (100) is communicatively connected to the first form detector (11), the magnetic element (12), the pump body (31), the solenoid valve (13), the second form detector (21), the stirrer (22), the flow control valve (51), the alarm (60) and the sensor (70).

6. The detection device for oil well scale samples according to claim 5, characterized in that: The first detection container (10), the second detection container (20), the reagent container (30), the collection container (40), and the gas reagent container (50) are all made of transparent materials.

7. A detection method for an oil well scale sample detection device, characterized in that: include: Pre-treat the scale sample and place it into the detection container; Determining the type of the scale sample according to the appearance color of the scale sample includes: When the color of the scale sample is brown or tan, it is determined that the scale sample is an oxide containing Fe; When the color of the scale sample is black or grayish black, it is determined that the scale sample is a precipitate containing Fe; When the color of the scale sample is white or off-white, it is determined that the scale sample is salt sediment; adding a first detection liquid to the detection container; When the color of the scale sample is white or off-white and the scale sample is soluble in the first detection liquid, it is determined that the scale sample is NaCl.

8. The detection method according to claim 7, characterized in that When the color of the scale sample is brown or tan, determining that the scale sample is an oxide containing Fe further includes: When the scale sample is not dissolved in the first detection liquid, adsorbing the scale sample by a magnet; When the scale sample is attracted by the magnet, it is determined that the scale sample is Fe 3 O 4 or a sediment containing Fe 3 O 4 .

9. The detection method according to claim 7, characterized in that When the color of the scale sample is black or grayish black, determining that the scale sample is a precipitate containing Fe further includes: If the scale sample is not dissolved in the first detection liquid, draining the first detection liquid and adding a second detection liquid into the detection container; When the scale sample dissolves in the second detection liquid and generates bubbles and odor, it is determined that the scale sample is FeS.

10. The detection method according to claim 7, characterized in that: When the color of the scale sample is white or off-white, determining that the scale sample is a salt deposit further includes: If the scale sample is not dissolved in the first detection liquid, draining the first detection liquid and adding a second detection liquid into the detection container; When the scale sample is dissolved in the second detection liquid and bubbles are generated at a first rate, it is determined that the scale sample is CaCO 3 or MgCO 3 .

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