CN204759416U - Gas production curve is synthesized to gas well and analytic system thereof - Google Patents
Gas production curve is synthesized to gas well and analytic system thereof Download PDFInfo
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- CN204759416U CN204759416U CN201520298975.7U CN201520298975U CN204759416U CN 204759416 U CN204759416 U CN 204759416U CN 201520298975 U CN201520298975 U CN 201520298975U CN 204759416 U CN204759416 U CN 204759416U
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Abstract
The utility model discloses a gas production curve is synthesized to gas well and analytic system thereof belongs to oil gas field development gas well dynamic analysis technical field. The utility model discloses an it is on the curved basis of gas production is synthesized to present tradition to synthesize the gas production curve, according to the same time series instantaneous tolerance line component that superpose on the gas production line. The analytic system characteristic is: the day line chart module for according to production data are generated day line chart, timesharing line chart module for according to production data are generated timesharing line chart, gas production curve control module for realize that the page or leaf enlargies, reduces, removes, turns over to the gas production curvedly, the function is compared in the stack. The utility model provides a traditional gas production curve and analytic system reflection information quantity little, use not convenient technical defect. The utility model discloses the reflection information quantity is big, can not only follow the macroscopic view problem of looking for fast, but also can carry out careful assay to the production problem, has image, efficient advantage, greatly makes things convenient for technical staff's dynamic analysis.
Description
Technical field
The utility model relates to the comprehensive gas production curve of a kind of gas well and analytic system thereof, belongs to oil-gas field development dynamic analysis of gas well technical field, particularly a kind of comprehensive gas production curve and analytic system thereof that can indicate instantaneous tolerance.
Background technology
The comprehensive gas production curve of gas well is by data such as the gas production rate of gas well, Liquid output, pressure in gas-field exploitation process, a kind of curve drawn out according to regular hour sequence, as shown in Figure 1.It reflects the aggregate data of gas well with the formal intuition of broken line graph, it is the record of gas well liquid loading history, also the basic characteristics of gas well liquid loading can directly be reflected, enable technician by analyzing gas production rate, Liquid output, the time dependent relation of pressure, and therefrom find the reason of gas well waterout change, find Problems existing in gas well liquid loading, predict recent Production development change, game in time, make gas well steady production.Comprehensive gas production tracing analysis to can be described as in gas well liquid loading performance analysis important tools and techniques means.
From five sixties so far, petroleum industry continues to use traditional gas production curve of this broken line graph feature always.Its principal feature marks, the data such as daily output tolerance, daily fluid production rate that every day enrolls for technician's performance analysis.In the age that computer utility degree is in the past not high, because it draws simple, in Oil/gas Well performance analysis, play important effect.But along with the raising of current oil gas field automatic management degree, increasing gas field, as high sulfur Gas Fields, offshore oil and gas field, gas storage etc., data acquisition become from original artificial reading gradually various flow is installed, pressure, temperature sensor gather automatically.Make that the frequency of data acquisition is higher like this, data volume is larger, data are more reliable, for dynamic analysis of gas well provides better basic condition.
Along with improving constantly of the abundant of data resource and Computer display technology and arithmetic speed, the development trend of gas production curve must can hold the future development of more data to unit period.And existing traditional gas production curve and analytic system major drawbacks thereof show as: 1, the data volume that tradition gas production curve indicates very little, only denote daily output tolerance relation over time, and produce the transient change situation of tolerance daily, as the highest tolerance of every day, minimum tolerance, other important informations such as tolerance fluctuation range cannot reflect, this just causes gas production curve insensitive to output fluctuation, and these information are generally comprised within instantaneous tolerance (1 hour or the 1 minute data point) data gathered every day, owing to needing the data point of sign too many, by the restriction of graphical representation mode, existing traditional gas production curve map cannot indicate, cause the quantity of information of reflection very little, can not reflect that gas well liquid loading is dynamic in time.2, traditional gas production tracing analysis system can not carry out efficiently gas production curve amplification, reduce, move, superpose than peering, cause performance analysis not efficiently, not convenient.
In sum, the above technological deficiency that existing tradition comprehensive gas production curve and analytic system thereof exist, not only wastes available data resource, is also unfavorable for finding the problem in the daily production management of gas well, constrains the development of dynamic analysis of gas well technology.
Summary of the invention
The purpose of this utility model overcomes in existing comprehensive gas production curve can only indicate daily output tolerance one item number certificate, the technological deficiency that quantity of information is few, provides a kind of comprehensive gas production curve and the analytic system thereof that can indicate instantaneous tolerance.
The utility model is realized by the following technical programs:
The comprehensive gas production curve (Day Line Chart) that can indicate instantaneous tolerance that the utility model proposes, on the basis of the comprehensive gas production curve of existing tradition, on gas production rate line, superpose instantaneous tolerance line by same time series to form, and Liquid output line is changed to histogram by original broken line graph, to strengthen display effect, wherein:
The instantaneous tolerance line in described odd-numbered day, by loose tolerance (indicating by "-") of the highest tolerance, minimum tolerance and all the other 10 points of gas well instantaneous tolerance on the same day (as 2 hours data points), connects to form with a vertical line segment (if colored display can be red, green line).Wherein, the highest instantaneous tolerance is line segment upper end, and minimum tolerance is line segment lower end, and red line represents that current instantaneous tolerance produces tolerance daily higher than the previous day, otherwise is then green line.
The timesharing tolerance line chart (timesharing line chart) that the utility model proposes is marked in polar coordinate system the gas well instantaneous tolerance data of a day (as 1 minute data point).Wherein footpath, r(pole) in order to indicate the size of instantaneous tolerance, the production time t(1440 minute of θ (polar angle) in order to represent one day), by counterclockwise rotating (within 1 minute, rotating 0.25 °), the angle of distance pole axis (t=0).Then the end points straight line in each adjacent direction is coupled together, plot one just like the closed curve of circle, in order to describe timesharing every day tolerance fluctuation situation.
The gas production tracing analysis system that the utility model proposes, comprises sensor assembly, background data base server module, foreground client module.
Wherein, described sensor assembly, forms by being arranged on aboveground pressure transducer, temperature sensor, flow sensor etc., is responsible for the pressure of Real-Time Monitoring well head, temperature and yield data and is converted to digital signal.
Described background data base server module, is made up of data acquisition module and large-scale relational database server (SQLSERVER or ORCAL database), is responsible for the signals collecting of sensor assembly monitoring and stores into database server.
Described foreground client module, includes internal memory, processor and display device.Wherein, memory storage has gas production tracing analysis software; Processor is then responsible for performing the gas production tracing analysis software in internal memory; Display device then in order to show the picture (display or mobile phone) of gas production tracing analysis software, also can perform the function (contact panel) of touch-control.
Wherein, described gas production tracing analysis software package contains: data reception module, Day Line Chart module, timesharing line chart module and gas production curve operational module.Described data reception module is sent to the production data of client by server end in order to receive.Described Day Line Chart module is in order to produce Day Line Chart according to production data.Described timesharing line chart module is in order to produce timesharing line chart according to production data.Described gas production curve operational module in order to realize gas production curve amplification, reduce, move, page turning, superposition is than reciprocity function.
The beneficial effects of the utility model are:
The utility model solves traditional gas production curve and analytic system reflection quantity of information is little, use not technological deficiency easily.The utility model reflection contains much information, and from macroscopical fast finding problem, and can not only can also carry out careful analysis to production problem, has image, efficiently advantage, greatly facilitates technician's performance analysis.
Accompanying drawing explanation
Fig. 1 is the comprehensive gas production curve map of existing tradition.
Fig. 2 is the comprehensive gas production curve map (Day Line Chart) that can indicate instantaneous tolerance of the present utility model.
Fig. 3 is the instantaneous tolerance line schematic diagram in odd-numbered day of the present utility model.
Fig. 4 is timesharing tolerance line chart (timesharing line chart) of the present utility model.
Fig. 5 is gas production tracing analysis system architecture of the present utility model and functional block diagram one.
Fig. 6 is gas production tracing analysis system architecture of the present utility model and functional block diagram two.
Fig. 7 is the process flow diagram of user operation the utility model embodiment.
Fig. 8 is instantaneous tolerance line morphology schematic diagram of the present utility model.
Fig. 9 is timesharing line chart form schematic diagram of the present utility model.
Figure 10 is the Day Line Chart of the utility model embodiment one.
Figure 11 is the amplification Day Line Chart of the utility model embodiment one.
Figure 12 is the timesharing line chart of the utility model embodiment one.
Figure 13 is the timesharing line morphology figure of the utility model embodiment one.
Figure 14 is the Day Line Chart of the utility model embodiment two.
Figure 15 is the timesharing line morphology figure of the utility model embodiment two.
Figure 16 is the Day Line Chart of the utility model embodiment three.
Figure 17 is the timesharing line morphology figure of the utility model embodiment three.
In figure: instantaneous tolerance line 1, gas production rate line 2, Liquid output line 3, sensor assembly 4, pressure transducer 5, temperature sensor 6, flow sensor 7, background data base server module 8, data acquisition module 9, large-scale relevant database 10, foreground client module 11, display device 12, processor 13, internal memory 14, gas production tracing analysis software 15, data reception module 16, Day Line Chart module 17, timesharing line chart module 18, gas production curve operational module 19, leading line 20, floating frame 21.
Embodiment
Below in conjunction with accompanying drawing, concrete description is done to the utility model:
As shown in Figure 2, the comprehensive gas production curve (Day Line Chart) that can indicate instantaneous tolerance that the utility model proposes, on the basis of the comprehensive gas production curve (consulting Fig. 1) of existing tradition, on gas production rate line 2, superpose instantaneous tolerance line 1 by same time series to form, and Liquid output line 3 is changed to histogram by original broken line graph, to strengthen display effect, wherein:
As shown in Figure 3, the instantaneous tolerance line 1 in described odd-numbered day, by loose tolerance (indicating by "-") of the highest tolerance, minimum tolerance and all the other 10 points of gas well instantaneous tolerance on the same day (as 2 hours data points), connects to form with a vertical line segment (if colored display can be red, green line).Wherein, the highest instantaneous tolerance is line segment upper end, and minimum tolerance is line segment lower end, and red line represents that current instantaneous tolerance produces tolerance daily higher than the previous day, otherwise is then green line.
As shown in Figure 4, the timesharing tolerance line chart (timesharing line chart) that the utility model proposes is marked in polar coordinate system the gas well instantaneous tolerance data of a day (as 1 minute data point).Wherein footpath, r(pole) in order to indicate the size of instantaneous tolerance, the production time t(1440 minute of θ (polar angle) in order to represent one day), by counterclockwise rotating (within 1 minute, rotating 0.25 °), the angle of distance pole axis (t=0).Then the end points straight line in each adjacent direction is coupled together, plot one just like the closed curve of circle, in order to describe timesharing every day tolerance fluctuation situation.
As shown in Figure 5, the gas production tracing analysis system that the utility model is used, comprises sensor assembly 4, background data base server module 8, foreground client module 11, wherein:
Described sensor assembly 4, forms by being arranged on aboveground pressure transducer 5, temperature sensor 6, flow sensor 7 etc., is responsible for the pressure of Real-Time Monitoring well head, temperature and yield data and is converted to digital signal.
Described background data base server module 8, connected to form by data acquisition module 9 and large-scale relational database server 10 (SQLSERVER or ORCAL database), be responsible for the signals collecting of being monitored by sensor assembly 4 and store into database server 10.
Described foreground client module 11, includes internal memory 14, processor 13 and display device 12.Wherein, internal memory 14 stores gas production tracing analysis software 15; Processor 13 is responsible for performing the gas production tracing analysis software 15 in internal memory 14; Display device 12, in order to show the picture (display or mobile phone) of gas production tracing analysis software 15, also can perform the function (contact panel) of touch-control.
As shown in Figure 6, wherein, described gas production tracing analysis software package contains: data reception module 16, Day Line Chart module 17, timesharing line chart module 18 and gas production curve operational module 19.Described data reception module 16 is sent to the production data of client by server end in order to receive.Described Day Line Chart module 17 is in order to produce Day Line Chart (consulting Fig. 2) according to production data.Described timesharing line chart module 18 is in order to produce timesharing line chart (consulting Fig. 4) according to production data.Described gas production curve operational module 19 in order to realize gas production curve amplification, reduce, move, page turning, superposition is than reciprocity function.
As shown in Figure 7, comprehensive gas production tracing analysis system of the present utility model uses and comprises the following steps:
(S1) gas production tracing analysis software is performed:user performs gas production tracing analysis software of the present invention on mobile device (as smart mobile phone), panel computer or computer.
(S2) individual well production data table (description) is shown:from storehouse, automatically extract data, and show the nearest production data of individual well in a tabular form, field contents is pound sign, date of manufacture, pressure, well opening time etc.
(S3) gas production curve Day Line Chart is called:as shown in Figure 2, double-click selected pound sign in " individual well production data table " (description) be expert at, the Day Line Chart of this well can be entered, again by the Scalable of " ↑ ↓ ← → PgUpPgDn " key manipulation Day Line Chart, move left and right, the modes such as front and back page turning observe instantaneous tolerance line 1 form in odd-numbered day and instantaneous tolerance line 1 tendency of Duo, manipulation Day Line Chart carries out the macroanalysis of gas well liquid loading situation, as shown in Figure 8, the meaning of the instantaneous tolerance line morphology representative in odd-numbered day (is graphic simplicity, be convenient to understand with 4 hours data point examples): vertical line section part is longer, in vertical line section, loose point is not concentrated, then the same day is the highest and minimum tolerance gap is larger, tolerance fluctuation is larger, otherwise it is less to fluctuate, therefore tolerance fluctuates, little line morphology is by similar " one ", " ten ", " work ", “ Xia " etc. word, as shown in Figure 2, the milder tolerance of instantaneous tolerance line 1 tendency of many days is more stable, otherwise unstable.
(S4) gas production curve timesharing line chart is called:as shown in figure 12, mobile navigation line 20(mouse position index line on Day Line Chart) to selected location, the timesharing line chart on floating frame 21 show navigator line 20 place date is ejected after double-clicking, again by switching timesharing line chart in floating frame 21 before and after " PgUpPgDn " key and observing timesharing line chart form (consulting Fig. 9) by the mode of the timesharing line chart superposed in floating frame 21 before and after "+-" key, and can the mode of Day Line Chart manipulate timesharing line chart and carry out gas well liquid loading situation careful analysis bottom Synchronous, as shown in Figure 9, timesharing line chart form, mainly contain following several fundamental figure or arbitrarily combine (cannot one by one example) by fundamental figure, the meaning of its fundamental figure representative is as follows:
Smooth round 9a: normal steadily aerogenesis (more smooth round, aerogenesis is more steady);
Reducing circle 9b: natural production decline or artificially adjust output (output uprises or step-down);
Variable curvature circle 9c: fluctuation or aerogenesis instability (Curvature varying is larger, and tolerance fluctuation is larger) appear in tolerance;
Sawtooth circle 9d: gas well band liquid is produced (the longer liquid measure of sawtooth is relatively more, and tolerance fluctuation is larger);
Radial round 9e: artificial interference or pit shaft or ground flow abnormal, as blocking etc.(ray is longer, and tolerance sharply changes more severe).
Below in conjunction with concrete drawings and Examples, the utility model is described in further detail:
embodiment 1:P-1 gas well
Step 1: Day Line Chart macroanalysis.As shown in Figure 10, amplify, reduce, move left and right by keyboard " ↑ ↓ ← → ", the overall tendency of this well Day Line Chart of macroanalysis, following information can be obtained rapidly: overwhelming majority time instantaneous tolerance line 1 amplitude is little, illustrates that production is more steady; Region A instantaneous tolerance line 1 and gas production rate line 2 non-intersect, illustrate daily output tolerance statistics have deviation, should be as the criterion with instantaneous tolerance line 1; The position of the Liquid output line 3 at leading line 20 place, be the watershed divide of water yield change, Liquid output is step-like unexpected rising, and gas well may occur exception.
Step 2: Day Line Chart amplifies to be analyzed.As shown in figure 11, the Day Line Chart near leading line 20 is amplified by " ↑ " key, 13 ~ May 23 region B(5 month) instantaneous tolerance line 1 fluctuates larger, connected in three afterwards special May 21 and fall tendency, amplitude is increasing, and indication output is more and more unstable, and gas well may occur exception.After this well unexpected water breakthrough on May 23, the water yield is not fallen always, from then on enters the mining phase of irreversible significantly water breakthrough.
Step 3: timesharing line chart careful analysis.As shown in figure 11, leading line 20 in the B of double click on area, as shown in figure 12, namely the timesharing line chart on floating frame 21 show navigator line 20 place date is ejected, recycling " PgUpPgDn " key front and back in floating frame 21 switch the timesharing line chart observing 12 ~ May 23 May, and observe other productive frontiers situation of change (as Liquid output line 3) in the Day Line Chart of bottom simultaneously, as shown in figure 13, by line chart form changing features during this well 23 bu on 12 ~ May of May of comparison, deciphering gas well history production status that can be vivid:
Line chart 13a during 12 bu in May in 2014: form is smooth circle, and Liquid output is little (2.88m also
3), illustrate that gas well liquid loading is normal, tolerance is steady; Line chart (13b ~ 13e) during 19 bu in 13 days ~ May May in 2014: form is variable curvature circle, illustrate that tolerance starts fluctuation, Curvature varying is larger, figure more not circle, illustrates that the same day produces more not steady; Line chart 13f during 20 bu in May in 2014: form is reducing circle, can find out for maintaining output, and people once (improves tolerance to 250,000 sides from 200,000 sides) for carrying product; Line chart 13g during 22 bu in May in 2014: form presents the reducing circle of variable curvature, illustrates to carry and to produce unsuccessfully and output does not surely live (falling back to 200,000 sides from 250,000 sides); Line chart 13h during 23 bu in May in 2014: form presents more irregular reducing circle, illustrates that output is more unstable, and Liquid output jumps 14.9 sides, and exception appears in gas well.
As can be seen from embodiment 1, before there is abnormal (water yield rises suddenly) in this well, gas production curve Day Line Chart and timesharing line chart give the fine response of production changing features in form and tendency, therefore technician is by analyzing Day Line Chart and timesharing line chart, just can catch gas well liquid loading variation characteristic, carry out gas well liquid loading performance analysis.
embodiment 2:P-2 gas well
As shown in Figure 14, Figure 15, identical with embodiment 1, by macroanalysis P-2 well Day Line Chart and careful comparison timesharing line chart morphological feature, following understanding can be obtained:
1, the overall amplitude of P-2 well instantaneous tolerance line 1 is comparatively large, illustrates that the fluctuation of production tolerance is larger.If only rely on this well gas production rate line 2 to analyze, because this line is insensitive to output fluctuation, therefore be not easy to find this phenomenon.
2, very intuitively can find out that this well water outlet is serious, in step-like rising from this well Liquid output line 3.A-quadrant instantaneous tolerance line 1 amplitude is comparatively large, and as shown in figure 15, corresponding A region timesharing line chart 15a is variable curvature Circles feature, illustrates that fluctuation appears in tolerance, produces not steady, imply that Liquid output, gas production rate will change to some extent; B region Liquid output increases, and instantaneous tolerance line 1 amplitude is less, and corresponding B region timesharing line chart 15b, in the smooth circular state feature of the little sawtooth of band, illustrates and can produce by stabilized zone liquid for the time being; C region instantaneous tolerance line 1 amplitude is comparatively large, and corresponding C region timesharing line chart 15c, in the sawtooth Circles feature for long saw tooth, after illustrating that Liquid output continues increase, causes tolerance to fluctuate increasing, if do not take effective discharge opeing measure, gas well likely hydrops stops production.
embodiment 3:P-3 gas well
As shown in figure 16, in P-3 well Day Line Chart, Liquid output change is little, but the instantaneous tolerance line 1 in A, B, C place, region fluctuates comparatively large, and the instantaneous tolerance line 1 in D place, region even falls tendency in five, imply that gas well may go wrong.
As shown in figure 17, recall the timesharing line chart 17a ~ 17e in P-3 well a-quadrant (on May 13,9 days ~ 2013 May in 2013), the timesharing line chart 17f ~ 17i in B region (May 21 18 ~ 2013 year May in 2013), the timesharing line chart 17j ~ 17m in C region (June 11 8 ~ 2013 year June in 2013), its form mostly is with radial circle, and ray divergence is violent; The timesharing line stacking diagram 17n in D region (July 13 9 ~ 2013 year July in 2013) presents the undergauge concentric circles that tolerance continues to fall, get rid of water mitigation (Liquid output without rising) and artificial interference factor (only from when timesharing in May 13 line chart 17e, 20 bu in May in 2013 in 2013 when line chart 17h, 8 bu in June in 2013 line chart 17j find out carried out three times and artificially adjusted product), this well of comprehensive descision may be stifled for pit shaft.The rear E stage (on August 1,24 ~ 2013 year July in 2013) closes aboveground operation de-plugging, and after operation, the main timesharing line chart 17p in F stage (August 15 11 ~ 2013 year August in 2013) is smooth circular state feature, and de-plugging success is described, gas well recovers steady production.
Above embodiment describes advantage of the present utility model emphatically; because the professional knowledge of dynamic analysis of gas well and technician and on-site experience are closely related; the conclusion that different technician draws may be different; but do not affect those skilled in the art understand advantage of the present utility model and implement according to this; and according to the content disclosed in this instructions, claims and accompanying drawing, any those skilled in the art can understand the relevant object of the utility model and advantage easily.
Claims (1)
1. a comprehensive gas production tracing analysis system, comprise sensor assembly (4), background data base server module (8), foreground client module (11), it is characterized in that: described sensor assembly (4), by being arranged on aboveground pressure transducer (5), temperature sensor (6), flow sensor (7) forms, described background data base server module (8), connected to form by data acquisition module (9) and large-scale relational database server (10), be responsible for the signals collecting of being monitored by sensor assembly (4) and store into database server (10), described foreground client module (11), include internal memory (14), processor (13) and display device (12), wherein, internal memory (14) stores gas production tracing analysis software (15), processor (13) is then responsible for performing the gas production tracing analysis software (15) in internal memory (14), display device (12) is then in order to show the picture of gas production tracing analysis software (15).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504300A (en) * | 2016-10-21 | 2017-03-15 | 福建中金在线信息科技有限公司 | The method for building up of component and system when a kind of |
| CN108765889A (en) * | 2018-04-17 | 2018-11-06 | 中国石油集团安全环保技术研究院有限公司 | Production of hydrocarbons operational safety method for early warning based on big data technology |
| CN108801320A (en) * | 2017-04-28 | 2018-11-13 | 中国石油天然气股份有限公司 | A kind of diagnostic method of natural gas metering system |
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2015
- 2015-05-12 CN CN201520298975.7U patent/CN204759416U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106504300A (en) * | 2016-10-21 | 2017-03-15 | 福建中金在线信息科技有限公司 | The method for building up of component and system when a kind of |
| CN108801320A (en) * | 2017-04-28 | 2018-11-13 | 中国石油天然气股份有限公司 | A kind of diagnostic method of natural gas metering system |
| CN108801320B (en) * | 2017-04-28 | 2020-12-01 | 中国石油天然气股份有限公司 | Diagnosis method of natural gas measurement system |
| CN108765889A (en) * | 2018-04-17 | 2018-11-06 | 中国石油集团安全环保技术研究院有限公司 | Production of hydrocarbons operational safety method for early warning based on big data technology |
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Inventor after: Du Zhengxue Inventor after: Qiang Yanlong Inventor after: Liu Jing Inventor after: Du Qingfeng Inventor after: Liu Shuping Inventor after: Yan Baoguan Inventor after: Zhang Qingsheng Inventor after: Zhang Wenchang Inventor after: Wang Yanfang Inventor after: Xie Aihua Inventor after: Zhao Jianguang Inventor after: Han Guoqing Inventor after: Fan Xiangyang Inventor after: Wang Zhaohua Inventor before: Du Zhengxue Inventor before: Du Qingfeng Inventor before: Liu Shuping Inventor before: Han Guoqing Inventor before: Zhang Wenchang Inventor before: Wang Yanfang Inventor before: Xie Aihua Inventor before: Zhao Jianguang Inventor before: Fan Xiangyang Inventor before: Wang Zhaohua Inventor before: Liu Jing |
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Effective date of registration: 20151027 Address after: 457001 geophysical exploration East Road, Zhongyuan Road, Zhongyuan Oilfield, Puyang District, Henan, Hualong 37-1-8 Patentee after: Qiang Yanling Patentee after: Fan Xiangyang Address before: 457001 geophysical exploration East Road, Zhongyuan Road, Zhongyuan Oilfield, Puyang District, Henan, Hualong 37-1-8 Patentee before: Qiang Yanling |
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