Wellhead chromatographic analysis to identify leaking devices and methods

Abstract

The present application relates to the technical field of wellhead leakage identification, and is a wellhead chromatographic analysis and identification leakage device, wherein the former comprises a collection box, an internal color developing card, an external color developing card, a first collection module, a second collection module, a color difference acquisition module, a time acquisition module and an alarm module. The present application has a reasonable and compact structure. The first collection module collects the color at at least one position on the upper side of the internal color developing card in the collection box, the second collection module collects the color on the outer side of the collection box, the color difference acquisition module determines the first color difference maximum value and acquires the second color difference, the time acquisition module acquires the time length from when the first color difference maximum value is equal to the color difference setting value to when the second color difference is equal to the color difference setting value, and the alarm module analyzes the first color difference maximum value and the time length from when the first color difference maximum value is equal to the color difference setting value to when the second color difference is equal to the color difference setting value to obtain an alarm judgment result, and triggers the corresponding level of alarm according to the alarm judgment result.

Description

Technical Field

[0001] This invention relates to the field of wellhead leak identification technology, and is a device and method for wellhead chromatographic analysis to identify leaks. Background Technology

[0002] In daily oilfield production, wellheads must be kept sealed to ensure safe production and prevent environmental pollution caused by leaks, spills, and punctures. During mechanical oil extraction, the load on the polished rod varies greatly as the pumping unit's suspension cable reciprocates up and down, resulting in an uncertain trajectory and friction between the polished rod and packing. Combined with other factors, this leads to a high probability of packing wear at the wellhead. Packing wear is a major cause of wellhead sealing failure, oil leakage, and environmental pollution. When packing punctures are discovered on-site, the oilfield worker typically tightens the packing without stopping the machine to prevent further leakage. However, this operation is affected by the number of wellheads managed by the worker, their experience, and the timeliness of the operation, introducing many uncertainties. Therefore, wellhead oil leakage and environmental pollution cannot be effectively prevented.

[0003] Chinese patent document CN118110461A discloses a wellhead packing leakage monitoring device, which includes an oil receiving box, a photoelectric sensor, an alarm device, and a control unit. The oil receiving box is a hollow, upward-opening cylinder with a through-hole at the bottom center. At least two oil discharge switches are radially arranged on the lower outer side of the oil receiving box, and a connecting piece is provided on the inner side. This invention installs the oil receiving box on the wellhead below the wellhead packing. When the wellhead packing leaks, the leaked liquid enters the inside of the oil receiving box. When the liquid submerges the photoelectric sensor, the alarm device sounds. The control unit receives the signal from the photoelectric sensor, realizing automatic monitoring of wellhead packing leakage and enabling timely detection and elimination of leaks. However, during use, the photoelectric sensor is susceptible to rain, snow, fog, haze, and obstructions, which may affect its normal operation, leading to false detections or missed detections.

[0004] Chinese patent document CN116988780A discloses a wellhead packing leakage alarm method and device. It compares the real-time temperature data changes collected by the first and second temperature transducers around the wellhead packing box with the temperature data changes of the area of ​​the polished rod and the top of the packing box under normal production conditions. If the temperature data collected by the first and second temperature transducers according to a specific time set meets the judgment conditions, an alarm is triggered indicating a suspected oil or gas leak at the wellhead. The change in the packing box temperature data is promptly reported to remind inspection personnel to pay attention and handle the situation, preventing problems such as oil or gas (vapor) leaks and environmental pollution.

[0005] Chinese patent document CN119207026A discloses a wellhead leakage alarm device, an early warning method, and a wellhead intelligent leak prevention system. The wellhead leakage early warning method based on the wellhead leakage alarm device includes the following steps: S1, fixing the storage box to the upper end of the packing gland so that the sucker rod passes through the sucker rod hole, and installing a sealing ring inside the sucker rod hole; S2, fixing the explosion-proof box and the storage box together, and fixing the monitoring frame to one side of the wellhead; S3, activating the wellhead leakage alarm device, with the leakage sensor and liquid level sensor collecting liquid data from the storage box; when produced fluid splashes onto the surface of the leakage sensor inside the storage box, the leakage sensor sends a leakage command to the control unit, the control unit sends a start command to the transmitting module, the transmitting module sends a signal to the receiving module, and the receiving module sends a signal to... The processing module sends a signal and captures images of the upper outer side of the storage box using a camera. Based on the images, it determines whether the packing gland is leaking. If a leak occurs, the processing module sends a Level 1 warning signal to the control unit. When the produced fluid leaks into the storage box and the level sensor determines that the level of the produced fluid in the storage box is greater than or equal to a set value, the processing module sends a Level 2 warning signal to the control unit. When the produced fluid leaks into the storage box and the level sensor determines that both the level of the produced fluid and the salinity value are greater than or equal to a set value, the level sensor sends a Level 3 warning signal to the control unit. S4, the control unit issues an alarm message based on the warning signal reception time and the warning signal level.

[0006] While the wellhead leakage image recognition technology commonly used in domestic oilfields has significant advantages in terms of automation and real-time performance, in practical applications, changes in lighting, rain, snow, fog, haze, obstructions, etc., may affect image quality, leading to false detections or missed detections. Furthermore, small-scale leaks or slow seepage may be difficult to identify due to insufficient image resolution. Summary of the Invention

[0007] This invention provides a wellhead chromatographic analysis device and method for identifying leaks, which overcomes the shortcomings of the prior art and can effectively solve the problems of high difficulty and low accuracy in identifying wellhead leaks in existing oil wells.

[0008] One of the technical solutions of the present invention is achieved through the following measures: a wellhead chromatographic analysis and leakage identification device has a first acquisition module above the collection box and a second acquisition module outside the collection box. Both the first acquisition module and the second acquisition module are connected to a color difference acquisition module. The color difference acquisition module is connected to a time acquisition module and an alarm module, respectively. The time acquisition module is connected to the alarm module.

[0009] The first acquisition module acquires the color at at least one position on the upper side of the inner color card, and the second acquisition module acquires the color on the outer side of the outer color card.

[0010] The color difference acquisition module compares the color on the top of each acquired internal color card with the contrasting color to obtain multiple first color differences, determines the maximum value of the first color difference, and compares the color on the outside of the external color card with the contrasting color to obtain the second color difference.

[0011] The time acquisition module obtains the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value;

[0012] The alarm module analyzes the first maximum color difference value and the time taken from when the first maximum color difference value equals the color difference set value to when the second maximum color difference value equals the color difference set value, obtains the alarm judgment result, and triggers the corresponding level of alarm based on the alarm judgment result.

[0013] The following are further optimizations and / or improvements to one of the above-mentioned technical solutions:

[0014] As a first preferred embodiment, the aforementioned internal colorimetric card may include a substrate and, from bottom to top, a corrosion-resistant layer, a waterproof sealing layer, a nano-adsorption layer, and a fluorescent colorimetric layer fixed to the upper side of the substrate.

[0015] As a second preferred embodiment, the aforementioned internal colorimetric card may include a substrate and, from bottom to top, a waterproof sealing layer, a corrosion-resistant layer, a nano-adsorption layer, and a fluorescent colorimetric layer fixed to the upper side of the substrate.

[0016] As a third preferred embodiment, the aforementioned internal colorimetric card may include a substrate and, from bottom to top, a corrosion-resistant layer, a nano-adsorption layer, a waterproof sealing layer, and a fluorescent colorimetric layer fixed to the upper side of the substrate.

[0017] The color difference between the above fluorescent color developing layer and the crude oil is greater than 40.

[0018] The aforementioned collection box may include a left collection shell and a right collection shell that are identical in structure and symmetrically arranged. The right side of the left collection shell and the left side of the right collection shell are detachably and fixedly installed together. The lower side of the left collection shell and the lower side of the right collection shell are each provided with several downward-facing grooves, and a magnetic sheet is fixedly installed in each groove.

[0019] The first acquisition module mentioned above may include one to six first color mark sensors. A mounting bracket is provided on the outside of the collection box. One to six first color mark sensors are evenly distributed around the circumference of the mounting bracket corresponding to the position above the collection box. The second acquisition module includes a second color mark sensor. A second color mark sensor is provided on the mounting bracket corresponding to the position of the external color card.

[0020] The color difference acquisition module includes a first processing submodule and a second processing submodule. The alarm module includes an alarm judgment module and an alarm execution module. Each first color mark sensor is connected to the first processing submodule, and the second color mark sensor is connected to the second processing submodule. The first processing submodule and the second processing submodule are respectively connected to the time acquisition module and the alarm judgment module. The time acquisition module is connected to the alarm judgment module, and the alarm judgment module is connected to the alarm execution module.

[0021] The first processing submodule compares the color on the top of each acquired internal color card with the contrasting color to obtain multiple first color differences and determines the maximum value of the first color difference. The second processing submodule compares the color on the outside of the external color card with the contrasting color to obtain the second color difference.

[0022] The alarm judgment module has a preset set of judgment conditions. Based on the set of judgment conditions, it analyzes the time taken from the first maximum color difference value to the second maximum color difference value when the first maximum color difference value equals the color difference set value, and obtains the alarm judgment result.

[0023] The set of decision conditions includes:

[0024] Judgment condition one: The maximum value of the first color difference is greater than or equal to the color difference setting value;

[0025] Judgment condition two: the time taken when the first color difference maximum value is equal to the color difference setting value and the second color difference is equal to the color difference setting value is greater than the first time setting value;

[0026] Judgment condition three: The time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than or equal to the first time setting value and greater than or equal to the second setting time value;

[0027] Judgment condition four: If the time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than the second time setting value;

[0028] The alarm execution module has preset alarm trigger conditions, and triggers alarms of the corresponding level based on the alarm judgment results;

[0029] The alarm triggering conditions include:

[0030] If condition one is met, an alert is triggered;

[0031] If conditions one and two are met, a level three alarm will be triggered.

[0032] If conditions one and three are met, a level two alarm is triggered.

[0033] If conditions one and four are met, a level one alarm will be triggered.

[0034] The second technical solution of the present invention is achieved through the following measures: A wellhead chromatographic analysis method for identifying leaks includes the following steps:

[0035] The steps include the following:

[0036] Step 1: The first acquisition module acquires the color at at least one position on the upper side of the internal color card in the collection box. The color difference acquisition module compares the color on the upper side of each acquired internal color card with the contrasting color to obtain multiple first color differences and determines the maximum value of the first color difference. The inner side of the collection box is connected to the inner side of the packing cap.

[0037] Step two: The second acquisition module acquires the color on the outside of the collection box, and the color difference acquisition module compares the color on the outside of the external color card with the contrasting color to obtain the second color difference;

[0038] Step 3: The alarm module compares the first color difference with the set color difference value.

[0039] If the first color difference is less than the set color difference value, return to step one;

[0040] If the first color difference is greater than or equal to the color difference setting value, proceed to step four;

[0041] Step 4: The alarm module determines whether the first maximum color difference value is greater than or equal to the color difference set value and the second color difference value is greater than or equal to the color difference set value within the set color difference change time threshold. If yes, the time acquisition module obtains the time taken from when the first maximum color difference value equals the color difference set value to when the second color difference value equals the color difference set value, and proceeds to Step 5. If no, it returns to Step 1.

[0042] Step 5: The alarm module analyzes the first maximum color difference value and the time taken from when the first maximum color difference value equals the color difference set value to when the second maximum color difference value equals the color difference set value, obtains the alarm judgment result, and triggers the corresponding level of alarm based on the alarm judgment result.

[0043] The following are further optimizations and / or improvements to the second technical solution of the above invention:

[0044] In step three above, if the maximum value of the first color difference is greater than or equal to the color difference setting value, the frequency of collecting the second color difference is increased, and step four is entered.

[0045] The aforementioned alarm module analyzes the time taken from the first maximum color difference value to the second maximum color difference value equal to the set color difference value, obtains the alarm judgment result, and triggers alarms of the corresponding level based on the alarm judgment result, including:

[0046] The alarm judgment module has a preset set of judgment conditions. Based on the set of judgment conditions, it analyzes the time taken from the first maximum color difference value to the second maximum color difference value when the first maximum color difference value equals the color difference set value, and obtains the alarm judgment result.

[0047] The set of decision conditions includes:

[0048] Judgment condition one: The maximum value of the first color difference is greater than or equal to the color difference setting value;

[0049] Judgment condition two: the time taken when the first color difference maximum value is equal to the color difference setting value and the second color difference is equal to the color difference setting value is greater than the first time setting value;

[0050] Judgment condition three: The time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than or equal to the first time setting value and greater than or equal to the second setting time value;

[0051] Judgment condition four: If the time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than the second time setting value;

[0052] The alarm execution module has preset alarm triggering conditions, and triggers alarms of the corresponding level based on the alarm judgment results;

[0053] The alarm triggering conditions include:

[0054] If condition one is met, an alert is triggered;

[0055] If conditions one and two are met, a level three alarm will be triggered.

[0056] If conditions one and three are met, a level two alarm is triggered.

[0057] If conditions one and four are met, a level one alarm will be triggered.

[0058] The present invention has a reasonable and compact structure. In use, the collection box is installed on the upper side of the packing cap above the packing box, and the upper end of the pumping unit's polished rod passes through the through hole. The first acquisition module collects the color at at least one position on the upper side of the inner color card inside the collection box, and the second acquisition module collects the color on the outside of the collection box. The color difference acquisition module compares the color on the upper side of each acquired inner color card with the contrasting color to obtain multiple first color differences, determines the maximum value of the first color difference, and compares the color on the outside of the outer color card with the contrasting color to obtain the second color difference.

[0059] The time acquisition module obtains the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value. The alarm module analyzes the first color difference maximum value and the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value, and obtains the alarm judgment result. Based on the alarm judgment result, the corresponding level of alarm is triggered. That is, the severity level of the leak is determined by the speed at which the leaked liquid overflows onto the surface of the external color card after the leak occurs in the collection box and fills the collection box, thereby issuing alarm signals of different levels. Attached Figure Description

[0060] Appendix Figure 1 This is a schematic diagram of the front sectional view of the structure when used in Embodiment 1 of the present invention.

[0061] Appendix Figure 2 This is a schematic diagram of the front cross-sectional structure of the internal color card in Embodiment 2 of the present invention.

[0062] Appendix Figure 3 This is a schematic diagram of the front cross-sectional structure of the internal color card in Embodiment 3 of the present invention.

[0063] Appendix Figure 4 This is a schematic diagram of the front cross-sectional structure of the internal color card in Embodiment 4 of the present invention.

[0064] Appendix Figure 5 This is a schematic diagram of the front cross-sectional structure of Embodiment 7 of the present invention, in which two first color mark sensors are installed.

[0065] The codes in the attached diagram are as follows: 1 is the external color card, 2 is the through hole, 3 is the polished rod of the pumping unit, 4 is the packing box, 5 is the packing cap, 6 is the substrate, 7 is the corrosion-resistant layer, 8 is the waterproof sealing layer, 9 is the nano-adsorption layer, 10 is the fluorescent color-developing layer, 11 is the left collection shell, 12 is the right collection shell, 13 is the magnetic sheet, 14 is the mounting bracket, 15 is the first color mark sensor, and 16 is the second color mark sensor. Detailed Implementation

[0066] The present invention is not limited to the following embodiments, and the specific implementation can be determined according to the technical solution of the present invention and the actual situation.

[0067] In this invention, for ease of description, the description of the relative positions of the components is based on the appendix to the specification. Figure 1 The layout is described using a diagrammatic method, such as the positional relationships of front, back, top, bottom, left, and right, which are based on the instructions attached. Figure 1 The orientation of the layout is determined by the direction of the map.

[0068] The present invention will be further described below with reference to embodiments and accompanying drawings:

[0069] Example 1: As shown in the attached document Figure 1As shown, the wellhead chromatographic analysis and leak identification device includes a collection box, an inner colorimetric card, an outer colorimetric card 1, a first acquisition module, a second acquisition module, a color difference acquisition module, a time acquisition module, and an alarm module. The collection box has a through hole 2 running vertically through the center of its lower side. The inner side of the lower part of the collection box has an annular inner colorimetric card, and the outer colorimetric card 1 is located on the outer side of the collection box. The first acquisition module is located above the collection box, and the second acquisition module is located on the outer side of the collection box. Both the first and second acquisition modules are connected to the color difference acquisition module. The color difference acquisition module is connected to the time acquisition module and the alarm module, respectively. The time acquisition module is connected to the alarm module.

[0070] The first acquisition module acquires the color at at least one position on the upper side of the inner color card, and the second acquisition module acquires the color on the outer side of the outer color card 1.

[0071] The color difference acquisition module compares the color on the top of each acquired internal color card with the contrasting color to obtain multiple first color differences, determines the maximum value of the first color difference, and compares the color on the outside of the external color card 2 with the contrasting color to obtain the second color difference;

[0072] The time acquisition module obtains the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value;

[0073] The alarm module analyzes the first maximum color difference value and the time taken from when the first maximum color difference value equals the color difference set value to when the second maximum color difference value equals the color difference set value, obtains the alarm judgment result, and triggers the corresponding level of alarm based on the alarm judgment result.

[0074] The diameter of the through hole 2 is larger than the diameter of the polished rod 3 of the pumping unit, and the difference between the diameter of the through hole 2 and the diameter of the polished rod 3 of the pumping unit is 5-10mm. A guide port can be set on the side wall of the collection box. When the packing box 4 leaks, the liquid flows into the collection box. After the collection box is full of liquid, the liquid flows out from the guide port.

[0075] To facilitate the installation, replacement, and maintenance of the external color card 1 and the internal color card, the internal color card consists of two semi-circular ring-shaped color cards. The inner diameter of the combined ring-shaped internal color card can be 30mm, and the outer diameter can be 100mm. The inner diameter of the internal color card is larger than the diameter of the sucker rod, and the difference between the inner diameter of the internal color card and the diameter of the sucker rod is 5-10mm. The outer diameter of the internal color card is 1-1.2 times the outer diameter of the packing box 4. The external color card 1 unfolds into a strip shape, so that during installation, the long strip of external color card 1 can be wrapped around to form a ring and pasted on the outside of the collection box. The internal color card and the external color card 1 have the same structure but different shapes. The different shapes facilitate differentiation during installation and replacement, while the identical structure reduces manufacturing costs.

[0076] The inner color card and the outer color card 1 have a single light color on the surface, which forms a significant color difference with the crude oil (usually dark brown / black), and can be accurately and quickly identified by the first acquisition module, the second acquisition module, and the color difference acquisition module.

[0077] In use, the collection box is installed on the upper side of the packing cap 5 above the packing box 4. The upper end of the pumping unit's polished rod 3 passes through the through hole 2. The first acquisition module collects the color at at least one position on the upper side of the inner color card inside the collection box, and the second acquisition module collects the color on the outside of the collection box. The color difference acquisition module compares the color on the upper side of each acquired inner color card with the contrasting color to obtain multiple first color differences. The maximum value of the first color difference is determined, and the color on the outside of the outer color card 2 is compared with the contrasting color to obtain the second color difference.

[0078] The time acquisition module obtains the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value. The alarm module analyzes the first color difference maximum value and the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value, and obtains the alarm judgment result. Based on the alarm judgment result, the corresponding level of alarm is triggered. That is, the severity level of the leak is determined by the speed at which the leaked liquid overflows onto the surface of the external color card 1 after the liquid leaks into the collection box and fills the collection box, thereby issuing alarm signals of different levels.

[0079] If the maximum first color difference is less than the set color difference value, it indicates that other debris may have fallen into the collection box and landed on the inner color card inside the collection box. In this case, there is no leakage in the collection box, and it can be cleaned by employees during regular inspections. If the maximum first color difference is greater than or equal to the set color difference value, it indicates that there is a leakage on the upper side of the packing cap 5. The leaked liquid enters the collection box through the perforation hole 2 and lands on the upper side of the inner color card. The color on the upper side of the inner color card changes, and a first color difference greater than or equal to the set color difference value is formed between this color and the contrasting color. At this time, the alarm module issues a warning signal, and the second acquisition module increases the frequency of acquiring the color on the outside of the collection box.

[0080] If the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is greater than the first time setting value, the alarm module will issue a level three alarm signal; if the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is less than or equal to the first time setting value but greater than or equal to the second time setting value, the alarm module will issue a level two alarm signal; if the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is less than the second time setting value, the alarm module will issue a level one alarm signal. The first time setting value is greater than the second time setting value, and both the first time setting value and the second time setting value are time intervals.

[0081] If the first time setting is 30 minutes and the second time setting is 3 minutes, and the time taken from the first maximum color difference value to the second maximum color difference value being equal to the color difference setting value is greater than 30 minutes, the alarm module will issue a level 3 alarm signal. This leakage is a seepage, and the liquid leakage rate is relatively slow, prompting employees to conduct inspections and take corresponding measures. If the time taken from the first maximum color difference value to the second maximum color difference value being equal to the color difference setting value is 3-30 minutes, the alarm module will issue a level 2 alarm signal. This leakage is a dripping, and the liquid leakage rate is relatively fast, prompting employees to conduct inspections and take corresponding measures as soon as possible. If the time taken from the first maximum color difference value to the second maximum color difference value being equal to the color difference setting value is less than the second time setting value, the alarm module will issue a level 1 alarm signal. This leakage is a spray, and the liquid leakage rate is very fast, prompting employees to immediately go to the wellhead and take corresponding measures.

[0082] The above-mentioned wellhead chromatographic analysis leak identification device can be further optimized and / or improved according to actual needs:

[0083] Example 2: As the first optimization of Example 1, as shown in the appendix Figure 1 , 2 As shown, the internal color development card includes a substrate 6 and, from bottom to top, a corrosion-resistant layer 7, a waterproof sealing layer 8, a nano-adsorption layer 9, and a fluorescent color development layer 10, which are fixed to the upper side of the substrate 6 in sequence.

[0084] The substrate 6 is made of a highly opaque material with a matte surface treatment. The corrosion-resistant layer 7 is made of a corrosion-resistant polymer with chemical corrosion resistance (pH 1-14 tolerance) and low surface energy, as well as certain mechanical strength, such as polytetrafluoroethylene (PTFE), polyvinylidene fluoride (PVDF), and polypropylene (PP). The brushed waterproof sealing layer 8 isolates moisture and salt spray penetration, preventing corrosion of the substrate 6. The brushed nano-adsorption layer 9 efficiently adsorbs crude oil through its porous structure, enhancing detection sensitivity. Examples include activated carbon, diatomaceous earth, and nanofiber layers brushed onto the surface of the waterproof sealing layer 8. A fluorescent color-developing layer 10 is brushed on top of the nano-adsorption layer 9 to display changes in oil color, facilitating signal acquisition by the module. To prevent ultraviolet (UV) radiation from damaging the molecular structure of organic pigments, a protective layer is provided on the upper side of the fluorescent color-developing layer 10. The protective layer is a professional weather-resistant material, such as a UV absorber or ASA film, placed on the surface of the fluorescent color-developing layer 10. In this embodiment, the inner color-developing card can prevent substrate corrosion and improve crude oil adsorption.

[0085] Example 3: As a second optimization of Example 1, as shown in the appendix Figure 1 , 3 As shown, the internal color development card includes a substrate 6 and, from bottom to top, a waterproof sealing layer 8, a corrosion-resistant layer 7, a nano-adsorption layer 9, and a fluorescent color development layer 10, which are fixed to the upper side of the substrate 6 in sequence.

[0086] The only difference between this embodiment and embodiment five is the order in which the waterproof sealing layer 8 and the corrosion-resistant layer 7 are set. Similarly, in order to prevent ultraviolet (UV) radiation from damaging the molecular structure of organic pigments, a protective layer is provided on the upper side of the fluorescent color-developing layer 10 in this embodiment. The protective layer is a professional weather-resistant material, such as an ultraviolet absorber or an ASA film, set on the surface of the fluorescent color-developing layer 10. The inner color-developing card in this embodiment can prevent substrate corrosion and improve crude oil adsorption.

[0087] Example 4: As a third optimization of Example 1, as shown in the appendix Figure 1 , 4 As shown, the internal color development card includes a substrate 6 and, from bottom to top, a corrosion-resistant layer 7, a nano-adsorption layer 9, a waterproof sealing layer 8, and a fluorescent color development layer 10, which are fixed to the upper side of the substrate 6.

[0088] The only difference between this embodiment and embodiment five is the order in which the waterproof sealing layer 8 and the nano-adsorption layer 9 are set. Similarly, in order to prevent ultraviolet (UV) radiation from damaging the molecular structure of organic pigments, a protective layer is provided on the upper side of the fluorescent color-developing layer 10 in this embodiment. The protective layer is a professional weather-resistant material, such as an ultraviolet absorber or an ASA film, set on the surface of the fluorescent color-developing layer 10. The inner color-developing card in this embodiment can prevent substrate corrosion and improve crude oil adsorption.

[0089] Example 5: As an optimization of the above examples, as shown in the appendix. Figure 2 , 3 As shown in Figure 4, the color difference between the fluorescent color development layer 10 and the crude oil is greater than 40.

[0090] The inner and outer color cards 1 have a single light color on their surface. The fluorescent color layer 10 on the surface of the inner and outer color cards 1 is a contrasting color. The color of the inner and outer color cards 1 has a significant color difference (ΔE>40) with the crude oil (usually dark brown / black). For example, if the color of the fluorescent color layer 10 on the surface of the inner and outer color cards 1 is bright white (color number RAL9016), the reflectance of bright white is 92%, and the color difference ΔE between bright white and crude oil is 48; or if the color of the fluorescent color layer 10 on the surface of the inner and outer color cards 1 is fluorescent orange (color number RAL2008), the reflectance of fluorescent orange is 85%, and the color difference ΔE between fluorescent orange and crude oil is 52. In this way, after the crude oil leaks and flows to the upper side of the inner color card and the outer color card 1, the colors collected by the first and second acquisition modules are more easily identified by the processing module, thereby improving the accuracy of leak identification.

[0091] Example 6: As an optimization of the above examples, as shown in the appendix. Figure 1As shown, the collection box includes a left collection shell 11 and a right collection shell 12 with the same structure and symmetrical arrangement. The right side of the left collection shell 11 and the left side of the right collection shell 12 are detachably and fixedly installed together. Several downward-facing grooves are distributed at intervals on the lower side of the left collection shell 11 and the lower side of the right collection shell 12. A magnetic sheet 13 is fixedly installed in each groove.

[0092] Depending on the requirements, the right side of the left collection shell 11 and the left side of the right collection shell 12 can be detachably and fixedly installed together. For example, the right side of the left collection shell 11 and the left side of the right collection shell 12 can be glued together, or they can be installed together using connecting ears and connecting bolts with nuts threaded through the connecting ears. Alternatively, the right side of the left collection shell 11 and the left side of the right collection shell 12 can be brought together using magnetic sheets 13, or the right side of the left collection shell 11 and the left side of the right collection shell 12 can be installed together using external color card 1 and internal color card. Magnetic sheets 13 are existing known technology, and the adsorption force of each magnetic sheet 13 is greater than 5 kg / cm². In this way, the left collection shell 11 and the right collection shell 12 can form a ring-shaped collection box that is adsorbed onto the upper end of the packing cap 5 above the packing box 4. The pumping unit's polished rod 3 passes through the middle of the collection box, and the inner diameter of the collection box is 1-1.2 times the outer diameter of the packing box 4.

[0093] Example 7: As an optimization of the above examples, as shown in the appendix. Figure 5 As shown, the first acquisition module includes one to six first color mark sensors 15, and a mounting bracket 14 is provided on the outside of the collection box. One to six first color mark sensors 15 are evenly distributed around the circumference of the mounting bracket 14 corresponding to the position above the collection box. The second acquisition module includes a second color mark sensor 16, and a second color mark sensor 16 is provided on the mounting bracket 14 corresponding to the position of the external color card 1.

[0094] The color difference acquisition module includes a first processing submodule and a second processing submodule. The alarm module includes an alarm judgment module and an alarm execution module. Each first color mark sensor is connected to the first processing submodule, and the second color mark sensor is connected to the second processing submodule. The first processing submodule and the second processing submodule are respectively connected to the time acquisition module and the alarm judgment module. The time acquisition module is connected to the alarm judgment module, and the alarm judgment module is connected to the alarm execution module.

[0095] The first processing submodule compares the color on the top of each acquired internal color card with the contrasting color to obtain multiple first color differences and determines the maximum value of the first color difference. The second processing submodule compares the color on the outside of the external color card 1 with the contrasting color to obtain the second color difference.

[0096] The alarm judgment module has a preset set of judgment conditions. Based on the set of judgment conditions, it analyzes the time taken from the first maximum color difference value to the second maximum color difference value when the first maximum color difference value equals the color difference set value, and obtains the alarm judgment result.

[0097] The set of decision conditions includes:

[0098] Judgment condition one: The maximum value of the first color difference is greater than or equal to the color difference setting value;

[0099] Judgment condition two: the time taken when the first color difference maximum value is equal to the color difference setting value and the second color difference is equal to the color difference setting value is greater than the first time setting value;

[0100] Judgment condition three: The time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than or equal to the first time setting value and greater than or equal to the second setting time value;

[0101] Judgment condition four: If the time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than the second time setting value;

[0102] The alarm execution module has preset alarm trigger conditions, and triggers alarms of the corresponding level based on the alarm judgment results;

[0103] The alarm triggering conditions include:

[0104] If condition one is met, an alert is triggered;

[0105] If conditions one and two are met, a level three alarm will be triggered.

[0106] If conditions one and three are met, a level two alarm is triggered.

[0107] If conditions one and four are met, a level one alarm will be triggered.

[0108] According to the requirements, the mounting bracket 14 is a known prior art, such as an L-shaped aluminum alloy bracket fixed to the outside of the packing box 4 at the lower part. At least two sliding sleeves are slidably installed on the upper outer side of the L-shaped aluminum alloy bracket at intervals. The sliding sleeves are provided with vertical locking screws for fixing the sliding sleeves to the vertical section of the L-shaped aluminum alloy bracket. A horizontal rod is fixedly installed on the sliding sleeve. A rotating sleeve is fitted on the outside of the horizontal rod. The rotating sleeve is provided with horizontal locking screws for fixing the rotating sleeve to the outside of the horizontal rod. The first color mark sensor 15 and the second color mark sensor 16 are fixedly installed on the outside of the rotating sleeve at the corresponding positions. This allows adjustment of the height and tilt angle of the first color mark sensor 15 and the second color mark sensor 16. The mounting bracket can also be a known laboratory bracket or a square bracket, or the clamp, base rod, first crossbar and second crossbar for installing the first temperature transducer and the second temperature transducer as described in the wellhead packing leakage alarm method and device disclosed in Chinese patent document CN116988780A.

[0109] On-site, the height and angle of the first color mark sensor 15 and the second color mark sensor 16 need to be adjusted according to the actual packing, the installation of the first color mark sensor 15 and the second color mark sensor 16, to ensure that the detection area of ​​the first color mark sensor 15 and the second color mark sensor 16 is maximized. The first processing submodule and the second processing submodule can be based on existing known technologies, such as being set up in parallel in the same processor, such as the eXact 2 series colorimeter. The alarm execution module includes a warning device, a first alarm device, a second alarm device, and a third alarm device. The warning device, the first alarm device, the second alarm device, and the third alarm device are all existing known technologies. The warning device triggers a warning, the first alarm device triggers a level 3 alarm, the second alarm device triggers a level 2 alarm, and the third alarm device triggers a level 1 alarm.

[0110] One to six first color mark sensors 15 are evenly distributed along the circumference of the mounting bracket 14 above the collection box. One, two, three, or four first color mark sensors 15 are evenly distributed along the circumference of the mounting bracket 14 above the collection box.

[0111] When a first color mark sensor 15 is evenly distributed around the circumference of the mounting bracket 14 above the collection box, the mounting bracket 14 includes an L-shaped aluminum alloy bracket, two sliding sleeves are arranged vertically at intervals, and two horizontal rods are arranged in parallel. The first color mark sensor 15 is fixedly installed on the outside of the upper rotating sleeve, and the second color mark sensor 16 is fixedly installed on the outside of the lower rotating sleeve. The first color mark sensor 15 has single-point coverage. The area where the first color mark sensor 15 collects the color of the inner color card is less than 20% of the area of ​​the inner color card. That is, the blind zone of the first color mark sensor 15 is greater than 80%. It is suitable for fixed-point leakage monitoring where the area of ​​the inner color card is small and the requirement for monitoring area coverage is not high.

[0112] When two first color mark sensors 15 are evenly distributed around the circumference of the mounting bracket 14 above the collection box, the mounting bracket 14 includes two L-shaped aluminum alloy brackets symmetrically fixedly installed on the outside of the packing box 4. The two sliding sleeves of the right L-shaped aluminum alloy bracket are arranged vertically at intervals, and the two horizontal rods are arranged parallel to each other. The second color mark sensor 16 is fixedly installed on the outside of the lower rotating sleeve. One of the first color mark sensors 15 is fixedly installed on the outside of the upper rotating sleeve, and the other first color mark sensor 15 is fixedly installed on the outside of the rotating sleeve of the left L-shaped aluminum alloy bracket. The first color mark sensor 15 and the second color mark sensor 16 are symmetrically arranged at 180°. The first color mark sensor 15 and the second color mark sensor 16 form an intersecting detection area. By adjusting the height and angle of the two first color mark sensors 15, the two first color mark sensors 15 can collect the color of the area below 65% of the inner color card area, which is suitable for targeted key monitoring.

[0113] When three first color mark sensors 15 are evenly distributed around the circumference of the mounting bracket 14 above the collection box, the mounting bracket 14 includes three L-shaped aluminum alloy brackets symmetrically fixed on the outside of the packing box 4. The included angle between the rotating sleeves on the three L-shaped aluminum alloy brackets is 120°. The three first color mark sensors 15 are respectively installed on the outside of the three rotating sleeves. The second color mark sensor 16 is installed on the outside of the rotating sleeve above and below one of the L-shaped aluminum alloy brackets. In this way, the overlap rate of the three first color mark sensors 15 is 12%. By adjusting the height and angle of the three first color mark sensors 15, the three first color mark sensors 15 can collect the color of less than 85% of the area of ​​the inner color card, which is suitable for medium-precision full-circumference monitoring.

[0114] When four first color mark sensors 15 are evenly distributed around the circumference of the mounting bracket 14 above the collection box, the mounting bracket 14 includes four L-shaped aluminum alloy brackets symmetrically fixed on the outside of the packing box 4. The included angle between the rotating sleeves on the four L-shaped aluminum alloy brackets is 90°. The four first color mark sensors 15 are respectively installed on the outside of the four rotating sleeves. The second color mark sensor 16 is installed on the outside of the rotating sleeve above and below one of the L-shaped aluminum alloy brackets. The overlap rate of the four first color mark sensors 15 is 12%. It can collect the color of the area below 97% of the area of ​​the inner color card and cover the blind zone of <3%. By adjusting the height and angle of the three first color mark sensors 15, the three first color mark sensors 15 can collect the color of the area below 90% of the area of ​​the inner color card, which is suitable for high-precision blind zone-free monitoring.

[0115] The first processing submodule compares the color on the top of each collected internal color card with the contrasting color to obtain multiple first color differences and determines the maximum value of the first color difference. The second processing submodule compares the color on the outside of the external color card 1 with the contrasting color to obtain the second color difference. The time acquisition module obtains the time taken from when the maximum value of the first color difference equals the color difference set value to when the second color difference equals the color difference set value. That is, the severity level of the leakage is determined based on the speed at which the leaked liquid overflows onto the surface of the external color card 1 after the collection box is full when a liquid leak occurs in the collection box, thereby issuing alarm signals of different levels.

[0116] If the maximum first color difference is greater than or equal to the color difference setting value, it indicates that a leak has occurred on the upper side of the packing cap 5. The leaked liquid enters the collection box through the perforation hole 2 and falls on the upper side of the inner color card. The color on the upper side of the inner color card changes, and a first color difference greater than or equal to the color difference setting value is formed between this color and the contrasting color. At this time, the alarm will issue an alarm signal. At the same time, the second color mark sensor 16 will increase the frequency of color acquisition on the outside of the collection box. It can switch from the low-frequency detection mode, which collects color once every 3-30 minutes, to the high-frequency detection mode, which collects color once every 0.1-10 seconds. This can monitor the speed of leakage of the leaking liquid in the collection box and avoid failure to deal with it in time when the leakage speed is fast.

[0117] If the time taken from the first maximum color difference value (multiple first color mark sensors 15) equaling the color difference setting value to the second color difference equaling the color difference setting value is greater than the first time setting value, then the first warning device issues a level three alarm signal; if the time taken from the first maximum color difference value equaling the color difference setting value to the second color difference equaling the color difference setting value is less than or equal to the first time setting value but greater than or equal to the second set time value, then the second warning device issues a level two alarm signal; if the time taken from the first maximum color difference value equaling the color difference setting value to the second color difference equaling the color difference setting value is less than the second time setting value, then the third warning device issues a level one alarm signal, where the first time setting value is greater than the second time setting value, and both the first and second time setting values ​​are the time taken.

[0118] If the first time setting is 30 minutes and the second time setting is 3 minutes, if the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is greater than 30 minutes, the first warning device will issue a level 3 alarm signal, indicating that the leakage is in the form of seepage, prompting employees to conduct inspections and take corresponding measures. If the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is 3-30 minutes, the second warning device will issue a level 2 alarm signal, indicating that the leakage is in the form of dripping, prompting employees to conduct inspections and take corresponding measures as soon as possible. If the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is less than the second time setting value, the third warning device will issue a level 1 alarm signal, indicating that the leakage is in the form of spraying, prompting employees to go to the wellhead immediately to take corresponding measures.

[0119] This application is applicable to wellhead leaks under various working conditions. The collection box is suitable for various packing boxes 4 at oil wellheads, located above the pressure cap of the packing box 4 and integrated with it. A solar controller, reversible battery, and several photovoltaic panels can be installed on the side of the first color mark sensor 15. When there is sufficient sunlight, solar radiation energy can be directly converted into electrical energy through the photoelectric effect, and excess electrical energy is stored in the built-in reversible battery. When it is winter or there is insufficient sunlight, the reversible battery provides independent power supply. When the power storage is insufficient, a power shortage alarm is issued, and manual charging can meet the power support of the wellhead chromatographic analysis and leak identification device. In this way, the power source of the wellhead chromatographic analysis and leak identification device adopts solar panels, which meets the requirements of short continuous working time, independent power supply, green energy saving, and convenient installation. It can meet the needs of oilfields to promote the construction of intelligent oilfields, can detect wellhead leaks in time, reduce the occurrence of wellhead pollution incidents, realize unattended operation, provide technical support for the development of green oilfields, and has good prospects for promotion and application. This application utilizes the characteristic that leaked crude oil changes the color of pure color cards, combined with color mark sensor technology, to construct a reliable wellhead chromatographic analysis and leak identification device.

[0120] Example 8: As attached Figures 1 to 4 As shown, the wellhead chromatographic analysis method for identifying leaks includes the following steps:

[0121] Step 1: The first acquisition module acquires the color at at least one position on the upper side of the internal color card in the collection box. The color difference acquisition module compares the color on the upper side of each acquired internal color card with the contrasting color to obtain multiple first color differences and determine the maximum value of the first color difference. The inner side of the collection box is connected to the inner side of the packing cap 5.

[0122] Step two: The second acquisition module acquires the color on the outside of the collection box, and the color difference acquisition module compares the color on the outside of the external color card 1 with the contrasting color to obtain the second color difference;

[0123] Step 3: The alarm module compares the maximum first color difference value with the set color difference value.

[0124] If the maximum value of the first color difference is less than the set color difference value, then return to step one;

[0125] If the maximum value of the first color difference is greater than or equal to the color difference setting value, proceed to step four;

[0126] Step 4: The alarm module determines whether the first maximum color difference value is greater than or equal to the color difference set value and the second color difference value is greater than or equal to the color difference set value within the set color difference change time threshold. If yes, the time acquisition module obtains the time taken from when the first maximum color difference value equals the color difference set value to when the second color difference value equals the color difference set value, and proceeds to Step 5. If no, it returns to Step 1.

[0127] Step 5: The alarm module analyzes the first maximum color difference value and the time taken from when the first maximum color difference value equals the color difference set value to when the second maximum color difference value equals the color difference set value, obtains the alarm judgment result, and triggers the corresponding level of alarm based on the alarm judgment result.

[0128] The inner and outer color cards 1 have a single light color on their surfaces, creating a significant color difference with the crude oil. This allows for accurate and rapid identification by the first acquisition module, the second acquisition module, and the color difference acquisition module. The inner and outer color cards 1 have contrasting colors on their surfaces. In use, the collection box is installed on the upper side of the packing cap 5 above the packing box 4. The upper end of the pumping unit's polished rod 3 passes through the through hole 2. The first acquisition module collects the color at at least one location on the upper side of the inner color card inside the collection box, and the second acquisition module collects the color on the outer side of the collection box. The color difference acquisition module is used to acquire the first color difference between the color on the upper side of the inner color card and the contrasting color, and the second color difference between the color on the outer side of the outer color card 1 and the contrasting color, respectively.

[0129] The time acquisition module obtains the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value. That is, it determines the severity level of the leakage based on the speed at which the leaked liquid overflows onto the surface of the external color card 1 after the leakage occurs in the collection box and fills the collection box. This results in the issuance of alarm signals of different levels.

[0130] When the first color difference maximum value is equal to the color difference setting value, and the second color difference is less than the color difference setting value after the color difference change time threshold, it indicates that other debris may have fallen on the inner color card inside the collection box. At this time, no leakage has occurred inside the collection box, or it may be due to the first collection module malfunctioning. In this case, return to step one, and employees only need to clean it during regular inspections.

[0131] The above-mentioned wellhead chromatographic analysis method for identifying leaks can be further optimized and / or improved according to actual needs:

[0132] Example 9: As an optimization of the above examples, as shown in the appendix Figure 1 As shown, in step three, if the maximum value of the first color difference is greater than or equal to the color difference setting value, the frequency of collecting the second color difference is increased, and then step four is entered.

[0133] The first color mark sensor 15 and the second color mark sensor 16 are divided into two detection modes: low frequency and high frequency. During routine testing, both the first color mark sensor 15 and the second color mark sensor 16 are set to low frequency detection mode, which performs color sampling every 3-30 minutes to reduce energy consumption. When the maximum value of the first color difference is greater than the set color difference value, such as when the detection result ΔE≥10, the second color mark sensor 16 automatically switches to high frequency detection mode, which performs color sampling every 0.1-10 seconds. This can monitor the leakage rate of the liquid in the collection box and prevent failure to deal with the leakage in time when the leakage rate is fast.

[0134] Example 10: As an optimization of the above embodiments, as shown in the appendix Figure 1 , 5 As shown, the alarm module analyzes the time taken from the first maximum color difference value to the second maximum color difference value after the first maximum color difference value equals the set color difference value, obtains the alarm judgment result, and triggers alarms of the corresponding level based on the alarm judgment result, including:

[0135] The alarm judgment module has a preset set of judgment conditions. Based on the set of judgment conditions, it analyzes the time taken from the first maximum color difference value to the second maximum color difference value when the first maximum color difference value equals the color difference set value, and obtains the alarm judgment result.

[0136] The set of decision conditions includes:

[0137] Judgment condition one: The maximum value of the first color difference is greater than or equal to the color difference setting value;

[0138] Judgment condition two: the time taken when the first color difference maximum value is equal to the color difference setting value and the second color difference is equal to the color difference setting value is greater than the first time setting value;

[0139] Judgment condition three: The time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than or equal to the first time setting value and greater than or equal to the second setting time value;

[0140] Judgment condition four: If the time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than the second time setting value;

[0141] The alarm execution module has preset alarm triggering conditions, and triggers alarms of the corresponding level based on the alarm judgment results;

[0142] The alarm triggering conditions include:

[0143] If condition one is met, an alert is triggered;

[0144] If conditions one and two are met, a level three alarm will be triggered.

[0145] If conditions one and three are met, a level two alarm is triggered.

[0146] If conditions one and four are met, a level one alarm will be triggered.

[0147] The first color mark sensor 15 collects the color on the upper side of the inner color display card inside the collection box, and the second color mark sensor 16 collects the color on the outer side of the collection box. The first processing submodule compares the color on the upper side of each collected inner color display card with the contrasting color to obtain multiple first color differences and determine the maximum value of the first color difference. The second processing submodule compares the color on the outer side of the outer color display card 1 with the contrasting color to obtain the second color difference. The time acquisition module obtains the time taken from when the maximum value of the first color difference equals the color difference set value to when the second color difference equals the color difference set value. That is, the severity level of the leakage is determined based on the speed at which the leaked liquid overflows onto the surface of the outer color display card 1 after the collection box is filled with liquid leakage, thereby issuing alarm signals of different levels.

[0148] If the maximum first color difference is greater than or equal to the color difference setting value, it indicates that a leak has occurred on the upper side of the packing cap 5. The leaked liquid enters the collection box through the perforation hole 2 and falls on the upper side of the inner color card. The color on the upper side of the inner color card changes, and a first color difference greater than or equal to the color difference setting value is formed between this color and the contrasting color. At this time, the alarm will issue an alarm signal. At the same time, the second color mark sensor 16 will increase the frequency of color acquisition on the outside of the collection box. It can switch from the low-frequency detection mode, which collects color once every 3-30 minutes, to the high-frequency detection mode, which collects color once every 0.1-10 seconds. This can monitor the speed of leakage of the leaking liquid in the collection box and avoid failure to deal with it in time when the leakage speed is fast.

[0149] If the time taken from the first maximum color difference value (multiple first color mark sensors 15) equaling the color difference setting value to the second color difference equaling the color difference setting value is greater than the first time setting value, then the first warning device issues a level three alarm signal; if the time taken from the first maximum color difference value equaling the color difference setting value to the second color difference equaling the color difference setting value is less than or equal to the first time setting value but greater than or equal to the second set time value, then the second warning device issues a level two alarm signal; if the time taken from the first maximum color difference value equaling the color difference setting value to the second color difference equaling the color difference setting value is less than the second time setting value, then the third warning device issues a level one alarm signal, where the first time setting value is greater than the second time setting value, and both the first and second time setting values ​​are the time taken.

[0150] If the first time setting is 30 minutes and the second time setting is 3 minutes, if the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is greater than 30 minutes, the first warning device will issue a level 3 alarm signal, indicating that the leakage is in the form of seepage, prompting employees to conduct inspections and take corresponding measures. If the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is 3-30 minutes, the second warning device will issue a level 2 alarm signal, indicating that the leakage is in the form of dripping, prompting employees to conduct inspections and take corresponding measures as soon as possible. If the time taken from the first maximum color difference value equal to the color difference setting value to the second maximum color difference value equal to the color difference setting value is less than the second time setting value, the third warning device will issue a level 1 alarm signal, indicating that the leakage is in the form of spraying, prompting employees to go to the wellhead immediately to take corresponding measures.

[0151] When the first color difference maximum value is equal to the color difference setting value, and the second color difference is less than the color difference setting value after the color difference change time threshold, it indicates that other debris may have fallen onto the inner color card inside the collection box. At this time, no leakage has occurred inside the collection box, or it may be due to the first acquisition module malfunctioning. In this case, return to step one.

[0152] If the maximum value of the first color difference is equal to the color difference setting value, and the second color difference is less than the color difference setting value after 30 minutes, it indicates that other debris may have fallen onto the inner color card inside the collection box. At this time, there is no leakage in the collection box, or it may be due to the first color mark sensor 15 malfunctioning. In this case, return to step one, and the second color mark sensor 16 enters the low-frequency working mode. At the same time, the staff can clean it during regular inspections.

[0153] This application implements a three-level alarm system, reducing the possibility of false alarms during rain and snow, and providing timely and accurate early warnings to prevent further packing leakage and improve the safety and efficiency of wellhead sealing during oil production.

[0154] This invention addresses the challenge of accurately identifying wellhead leaks by proposing a color mark analysis and identification method for wellhead leaks. During on-site packing and puncture leak detection, after a wellhead leak, the produced fluid splashes onto the surface of an inner colorimetric card corresponding to the collection area of ​​the first color mark sensor 15. The first color mark sensor 15, installed above the inner colorimetric card, collects the color change on the upper side of the fluorescent colorimetric layer 10 on the inner colorimetric card at the corresponding location. A first processing submodule compares the color of each collected splashed produced fluid with the color of the fluorescent colorimetric layer 10 on the inner colorimetric card to obtain multiple first color differences, and determines the first color difference. The maximum value is then determined. The leaked collected fluid overflows onto the surface of the external color card 1 after filling the collection box. The second color mark sensor 16 collects the color change on the surface of the fluorescent color-developing layer 10 on the external color card 1. The second processing submodule compares the color of the outflowing collected fluid with the color of the fluorescent color-developing layer 10 on the external color card 1 to obtain the second color difference. The maximum value of the first color difference is compared with the color difference set value to determine whether a leak has occurred. Then, the length of time taken from when the maximum value of the first color difference equals the color difference set value to when the second color difference equals the color difference set value is determined to determine the level of leakage.

[0155] The above technical features constitute various embodiments of the present invention, which have strong adaptability and implementation effect. Unnecessary technical features can be added or removed according to actual needs to meet the needs of different situations.

Claims

1. A wellhead chromatographic analysis device for identifying leaks, characterized in that... It includes a collection box, an inner color display card, an outer color display card, a first acquisition module, a second acquisition module, a color difference acquisition module, a time acquisition module, and an alarm module. The collection box has a through hole running vertically through the center of its lower side. The inner side of the lower part of the collection box has a ring-shaped inner color display card, and the outer side of the collection box has an outer color display card. The first acquisition module is located on the top of the collection box, and the second acquisition module is located on the outer side of the collection box. Both the first and second acquisition modules are connected to the color difference acquisition module. The color difference acquisition module is connected to the time acquisition module and the alarm module, respectively. The time acquisition module is connected to the alarm module. The first acquisition module acquires the color at at least one position on the upper side of the inner color card, and the second acquisition module acquires the color on the outer side of the outer color card. The color difference acquisition module compares the color on the top of each acquired internal color card with the contrasting color to obtain multiple first color differences, determines the maximum value of the first color difference, and compares the color on the outside of the external color card with the contrasting color to obtain the second color difference. The time acquisition module obtains the time taken from when the first color difference maximum value equals the color difference set value to when the second color difference equals the color difference set value; The alarm module analyzes the first maximum color difference value and the time taken from when the first maximum color difference value equals the color difference set value to when the second maximum color difference value equals the color difference set value, obtains the alarm judgment result, and triggers the corresponding level of alarm based on the alarm judgment result; The first acquisition module includes one to six first color mark sensors, the second acquisition module includes a second color mark sensor, the color difference acquisition module includes a first processing submodule and a second processing submodule, and the alarm module includes an alarm judgment module and an alarm execution module. The first processing submodule compares the color on the top of each acquired internal color card with the contrasting color to obtain multiple first color differences and determines the maximum value of the first color difference. The second processing submodule compares the color on the outside of the external color card with the contrasting color to obtain the second color difference. The alarm judgment module has a preset set of judgment conditions. Based on the set of judgment conditions, it analyzes the time taken from the first maximum color difference value to the second maximum color difference value when the first maximum color difference value equals the color difference set value, and obtains the alarm judgment result. The set of decision conditions includes: Judgment condition one: The maximum value of the first color difference is greater than or equal to the color difference setting value; Judgment condition two: the time taken when the first color difference maximum value is equal to the color difference setting value and the second color difference is equal to the color difference setting value is greater than the first time setting value; Judgment condition three: The time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than or equal to the first time setting value and greater than or equal to the second setting time value; Judgment condition four: If the time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than the second time setting value; The alarm execution module has preset alarm trigger conditions, and triggers alarms of the corresponding level based on the alarm judgment results.

2. The wellhead chromatographic analysis leak identification device according to claim 1, characterized in that... The internal color development card includes a substrate and, from bottom to top, a corrosion-resistant layer, a waterproof sealing layer, a nano-adsorption layer, and a fluorescent color development layer, which are fixed to the upper side of the substrate.

3. The wellhead chromatographic analysis leak identification device according to claim 1, characterized in that... The internal color development card includes a substrate and, from bottom to top, a waterproof sealing layer, a corrosion-resistant layer, a nano-adsorption layer, and a fluorescent color development layer, which are fixed to the upper side of the substrate.

4. The wellhead chromatographic analysis leak identification device according to claim 1, characterized in that... The internal color development card includes a substrate and, from bottom to top, a corrosion-resistant layer, a nano-adsorption layer, a waterproof sealing layer, and a fluorescent color development layer, which are fixed to the upper side of the substrate.

5. The wellhead chromatographic analysis leak identification device according to claim 2, 3, or 4, characterized in that... The color difference between the fluorescent color developing layer and the crude oil is greater than 40; or / and, the collection box includes a left collection shell and a right collection shell with the same structure and symmetrical arrangement. The right side of the left collection shell and the left side of the right collection shell are detachably and fixedly installed together. Several downward-facing grooves are distributed at intervals on the lower side of the left collection shell and the lower side of the right collection shell. A magnetic sheet is fixedly installed in each groove.

6. The wellhead chromatographic analysis leak identification device according to claim 1, 2, 3, or 4, characterized in that... The outside of the collection box is equipped with a mounting bracket. One to six first color mark sensors are evenly distributed around the circumference of the mounting bracket corresponding to the position above the collection box. A second color mark sensor is provided on the mounting bracket corresponding to the position of the external color card. Each first color mark sensor is connected to the first processing submodule, and the second color mark sensor is connected to the second processing submodule. The first and second processing submodules are respectively connected to the time acquisition module and the alarm judgment module. The time acquisition module is connected to the alarm judgment module, and the alarm judgment module is connected to the alarm execution module. Alarm triggering conditions include: If condition one is met, an alert is triggered; If conditions one and two are met, a level three alarm will be triggered. If conditions one and three are met, a level two alarm is triggered. If conditions one and four are met, a level one alarm will be triggered.

7. The wellhead chromatographic analysis leak identification device according to claim 5, characterized in that... The outside of the collection box is equipped with a mounting bracket. One to six first color mark sensors are evenly distributed around the circumference of the mounting bracket corresponding to the position above the collection box. A second color mark sensor is provided on the mounting bracket corresponding to the position of the external color card. Each first color mark sensor is connected to the first processing submodule, and the second color mark sensor is connected to the second processing submodule. The first and second processing submodules are respectively connected to the time acquisition module and the alarm judgment module. The time acquisition module is connected to the alarm judgment module, and the alarm judgment module is connected to the alarm execution module. Alarm triggering conditions include: If condition one is met, an alert is triggered; If conditions one and two are met, a level three alarm will be triggered. If conditions one and three are met, a level two alarm is triggered. If conditions one and four are met, a level one alarm will be triggered.

8. A wellhead chromatographic analysis method for identifying leaks according to any one of claims 1 to 7, characterized in that... The steps include the following: Step 1: The first acquisition module acquires the color at at least one position on the upper side of the internal color card in the collection box. The color difference acquisition module compares the color on the upper side of each acquired internal color card with the contrasting color to obtain multiple first color differences and determine the maximum value of the first color difference. The inner side of the collection box is connected to the inner side of the packing cap. Step two: The second acquisition module acquires the color on the outside of the collection box, and the color difference acquisition module compares the color on the outside of the external color card with the contrasting color to obtain the second color difference; Step 3: The alarm module compares the maximum first color difference value with the set color difference value. If the maximum value of the first color difference is less than the set color difference value, then return to step one; If the maximum value of the first color difference is greater than or equal to the color difference setting value, proceed to step four; Step 4: The alarm module determines whether the first maximum color difference value is greater than or equal to the color difference set value and the second color difference value is greater than or equal to the color difference set value within the set color difference change time threshold. If yes, the time acquisition module obtains the time taken from when the first maximum color difference value equals the color difference set value to when the second color difference value equals the color difference set value, and proceeds to Step 5. If no, it returns to Step 1. Step 5: The alarm module analyzes the first maximum color difference value and the time taken from when the first maximum color difference value equals the color difference set value to when the second maximum color difference value equals the color difference set value, obtains the alarm judgment result, and triggers the corresponding level of alarm based on the alarm judgment result.

9. The wellhead chromatographic analysis method for identifying leaks according to claim 8, characterized in that... In step three, if the maximum value of the first color difference is greater than or equal to the color difference setting value, the frequency of collecting the second color difference is increased, and then step four is entered.

10. The wellhead chromatographic analysis method for identifying leaks according to claim 8 or 9, characterized in that... The alarm module analyzes the first maximum color difference value and the time taken from when the first maximum color difference value equals the color difference set value to when the second maximum color difference value equals the color difference set value, obtains the alarm judgment result, and triggers the corresponding level of alarm based on the alarm judgment result, including: The alarm judgment module has a preset set of judgment conditions. Based on the set of judgment conditions, it analyzes the time taken from the first maximum color difference value to the second maximum color difference value when the first maximum color difference value equals the color difference set value, and obtains the alarm judgment result. The set of decision conditions includes: Judgment condition one: The maximum value of the first color difference is greater than or equal to the color difference setting value; Judgment condition two: the time taken when the first color difference maximum value is equal to the color difference setting value and the second color difference is equal to the color difference setting value is greater than the first time setting value; Judgment condition three: The time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than or equal to the first time setting value and greater than or equal to the second setting time value; Judgment condition four: If the time taken from the first color difference maximum value being equal to the color difference setting value to the second color difference being equal to the color difference setting value is less than the second time setting value; The alarm execution module has preset alarm triggering conditions, and triggers alarms of the corresponding level based on the alarm judgment results; The alarm triggering conditions include: If condition one is met, an alert is triggered; If conditions one and two are met, a level three alarm will be triggered. If conditions one and three are met, a level two alarm is triggered. If conditions one and four are met, a level one alarm will be triggered.

Images