CN105756624A - Coal bed methane drainage and production control method and device - Google Patents
Coal bed methane drainage and production control method and device Download PDFInfo
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- CN105756624A CN105756624A CN201410787785.1A CN201410787785A CN105756624A CN 105756624 A CN105756624 A CN 105756624A CN 201410787785 A CN201410787785 A CN 201410787785A CN 105756624 A CN105756624 A CN 105756624A
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Abstract
The invention discloses a coal bed methane drainage and production control method and device and belongs to the field of coal bed methane drainage and production. The method comprises the following steps: a production type of a coal bed methane well is acquired; if the production type of the coal bed methane well is a water-lowering well type, the frequency of an acquisition frequency converter is controlled according to a first time period as a control period; if the production type of the coal bed methane well is a pressure stabilizing well type, the frequency of the acquisition frequency converter is controlled according to a second time period as the control period. Corresponding time period is selected as the control period according to the production type of the coal bed methane well for control of the frequency of the acquisition frequency converter; the frequency adjustment range of the acquisition frequency converter is determined according to the bottomhole flowing pressure of the current control period and the ideal bottomhole flowing pressure of the current control period. Great fluctuation of the bottomhole flowing pressure due to frequent adjustment of the frequency of the acquisition frequency converter is avoided, and the defect that the service life of drainage and production equipment is affected by frequent adjustment of the drainage and production equipment is overcome; the production efficiency for drainage and production of coal bed methane is increased.
Description
Technical field
The present invention relates to coal bed gas extraction field, particularly to control method and the device of a kind of coal bed gas extraction.
Background technology
Coal bed gas automatic technology is a kind of emerging technology produced in coal-bed gas exploitation process, it is made up of Wireless data acquisition unit and manufacturing parameter acquisition module, wherein, Wireless data acquisition unit is the core of whole control system, and it can be directly obtained the manufacturing parameters such as the frequency of flowing bottomhole pressure (FBHP), casing pressure, pipe pressure, collection converter.
Core parameter in whole control system is flowing bottomhole pressure (FBHP), and intelligence mining controller obtains flowing bottomhole pressure (FBHP) in real time, and calculates the frequency obtaining gathering converter according to the flowing bottomhole pressure (FBHP) obtained in real time.When flowing bottomhole pressure (FBHP) is unsatisfactory for working system, coal bed gas well jig frequency can be adjusted.Such as: flowing bottomhole pressure (FBHP) decline is too fast exceedes expection, then need to lower the frequency gathering converter so that coal bed gas well jig frequency number of times declines.It is finally reached target and realizes the even running of coal bed gas well, alleviate the work load of personnel, it is achieved intelligence mining.
Inventor have found that prior art at least there is problems in that
By obtaining the mode of flowing bottomhole pressure (FBHP) in real time, change frequently in situation running into flowing bottomhole pressure (FBHP), can cause that the adjustment frequency to the frequency gathering converter is excessively frequent, flowing bottomhole pressure (FBHP) is caused to fluctuate widely, and then cause that mining equipment adjusts frequently, affect the service life of mining equipment, reduce the efficiency of coal bed gas extraction.
Summary of the invention
In order to solve problem of the prior art, embodiments provide control method and the device of a kind of coal bed gas extraction.Described technical scheme is as follows:
On the one hand, it is provided that the control method of a kind of coal bed gas extraction, described method includes:
Obtain the mining type of coal bed gas well；
If the mining type of described coal bed gas well is pressure reduction well type, then being a control cycle according to the cycle very first time is controlled the frequency gathering converter；
Wherein, the frequency control system gathering converter of described pressure reduction well type includes:
Obtain the first flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the first flowing bottomhole pressure (FBHP) of described current control period is compared with the first ideal well underflow pressure of current control period in the ideal well underflow drops curve preset；
If the first flowing bottomhole pressure (FBHP) of described current control period is more than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 3%；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then calculate the Amplitude of Hypotensive of the first flowing bottomhole pressure (FBHP) of described current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle；If described Amplitude of Hypotensive is more than predetermined amplitude, then the frequency keeping described collection converter is constant；If described Amplitude of Hypotensive is less than predetermined amplitude, then the frequency of described collection converter is raised 1%；
If the first flowing bottomhole pressure (FBHP) of described current control period is less than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 4%；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
If the mining type of described coal bed gas well is pressure stabilizing well type, then being a control cycle according to the second time cycle is controlled the frequency gathering converter；Wherein, the described cycle very first time and described second time cycle differ；
Wherein, the frequency control system gathering converter of described pressure stabilizing well type includes:
Obtain the 4th flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the 4th flowing bottomhole pressure (FBHP) of described current control period is compared with the secondary ideal flowing bottomhole pressure (FBHP) of current control period in the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset；
If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 2%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 3%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant.
Wherein, the Amplitude of Hypotensive of the 3rd flowing bottomhole pressure (FBHP) in the first flowing bottomhole pressure (FBHP) of the described current control period of described calculating and previous control cycle, including:
Undertaken asking difference operation to obtain flowing bottomhole pressure (FBHP) difference by described 3rd flowing bottomhole pressure (FBHP) in previous control cycle and the first flowing bottomhole pressure (FBHP) of described current control period；
Undertaken asking business's computing to obtain Amplitude of Hypotensive by described flowing bottomhole pressure (FBHP) and the described cycle very first time.
Wherein, the described cycle very first time is two hours；Described second time cycle is half an hour.
Wherein, described method also includes:
When reentering mining operation after stopping well, obtain each flowing bottomhole pressure (FBHP) of record in current 3rd preset time period；
According to each the flowing bottomhole pressure (FBHP) averaged got, and set the frequency of described collection converter according to described meansigma methods.
Wherein, described 3rd Preset Time is eight hours.
On the other hand, it is provided that the control device of a kind of coal bed gas extraction, described device includes:
First acquisition module, for obtaining the mining type of coal bed gas well；
First controls module, if being pressure reduction well type for the mining type of described coal bed gas well, is then that the control cycle frequency to gathering converter is controlled according to the cycle very first time；
Wherein, described first controls module, including:
First acquiring unit, for obtaining the first flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the first flowing bottomhole pressure (FBHP) of described current control period is compared with the first ideal well underflow pressure of current control period in the ideal well underflow drops curve preset；
First control unit, if for the first flowing bottomhole pressure (FBHP) of described current control period more than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 3%；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then calculate the Amplitude of Hypotensive of the first flowing bottomhole pressure (FBHP) of described current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle；If described Amplitude of Hypotensive is more than predetermined amplitude, then the frequency keeping described collection converter is constant；If described Amplitude of Hypotensive is less than predetermined amplitude, then the frequency of described collection converter is raised 1%；
Second control unit, if for the first flowing bottomhole pressure (FBHP) of described current control period less than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 4%；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
Second controls module, if being pressure stabilizing well type for the mining type of described coal bed gas well, is then that the control cycle frequency to gathering converter is controlled according to the second time cycle；Wherein, the described cycle very first time and described second time cycle differ；
Wherein, described second control module includes:
Second acquisition unit, for obtaining the 4th flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the 4th flowing bottomhole pressure (FBHP) of described current control period is compared with the secondary ideal flowing bottomhole pressure (FBHP) of current control period in the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset；
3rd control unit, if for the 4th flowing bottomhole pressure (FBHP) of described current control period more than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 2%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
4th control unit, if for the 4th flowing bottomhole pressure (FBHP) of described current control period less than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 3%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant.
Wherein, described first control unit also includes:
First operator unit, for being undertaken asking difference operation to obtain flowing bottomhole pressure (FBHP) difference by described 3rd flowing bottomhole pressure (FBHP) in previous control cycle and the first flowing bottomhole pressure (FBHP) of described current control period；
Second operator unit, for being undertaken asking business's computing to obtain Amplitude of Hypotensive by described flowing bottomhole pressure (FBHP) and the described cycle very first time.
Wherein, the described cycle very first time is two hours；Described second time cycle is half an hour.
Wherein, described device also includes:
Second acquisition module, when reentering mining operation after being used for stopping well, obtains each flowing bottomhole pressure (FBHP) of record in current 3rd preset time period；
Setting module, for each flowing bottomhole pressure (FBHP) averaged that basis gets, and sets the frequency of described collection converter according to described meansigma methods.
Wherein, described 3rd Preset Time is eight hours.
The technical scheme that the embodiment of the present invention provides has the benefit that
Mining type according to coal bed gas well, choosing the corresponding time cycle was controlled the frequency gathering converter as the control cycle, and determined that according to the flowing bottomhole pressure (FBHP) of current control period and the desirable flowing bottomhole pressure (FBHP) of current control period the frequency gathering converter adjusts amplitude.Avoid and fluctuate widely owing to frequently adjusting the flowing bottomhole pressure (FBHP) that causes of frequency gathering converter, and avoid and frequently mining equipment is adjusted, and affect the defect in the service life of mining equipment；Improve the production efficiency of mining coal bed gas.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme in the embodiment of the present invention, below the accompanying drawing used required during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the premise not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the control method flow chart of the coal bed gas extraction that the embodiment of the present invention one provides；
Fig. 2 is the control method flow chart of the coal bed gas extraction that the embodiment of the present invention two provides；
Fig. 3 be the coal bed gas extraction that the embodiment of the present invention two provides control method in the schematic diagram of flowing bottomhole pressure (FBHP) curve；
Fig. 4 is the control method flow chart of the coal bed gas extraction that the embodiment of the present invention three provides；
Fig. 5 be the coal bed gas extraction that the embodiment of the present invention three provides control method in the schematic diagram of flowing bottomhole pressure (FBHP) curve；
Fig. 6 is the control method flow chart of the coal bed gas extraction that the embodiment of the present invention four provides；
Fig. 7 is the control apparatus structure schematic diagram of the coal bed gas extraction that the embodiment of the present invention five provides.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiment one
Embodiments providing the control method of a kind of coal bed gas extraction, referring to Fig. 1, method flow includes:
101: obtain the mining type of coal bed gas well；
102: if the mining type of coal bed gas well is pressure reduction well type, then being a control cycle according to the cycle very first time is controlled the frequency gathering converter；
Wherein, the frequency control system gathering converter of pressure reduction well type includes:
Obtain the first flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the first flowing bottomhole pressure (FBHP) of current control period is compared with the first ideal well underflow pressure of current control period in the ideal well underflow drops curve preset；
If the first flowing bottomhole pressure (FBHP) of current control period is more than the first of current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of current control period is more than second flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is raised 3%；If the first flowing bottomhole pressure (FBHP) of current control period is less than second flowing bottomhole pressure (FBHP) in first control cycle, then calculate the Amplitude of Hypotensive of the first flowing bottomhole pressure (FBHP) of current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle；If Amplitude of Hypotensive is more than predetermined amplitude, then keep the frequency gathering converter constant；If Amplitude of Hypotensive is less than predetermined amplitude, then the frequency gathering converter is raised 1%；
If the first flowing bottomhole pressure (FBHP) of current control period is less than the first of current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of current control period is less than second flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is lowered 4%；If the first flowing bottomhole pressure (FBHP) of current control period is more than second flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant.
103: if the mining type of coal bed gas well is pressure stabilizing well type, then being a control cycle according to the second time cycle is controlled the frequency gathering converter；Wherein, the cycle very first time and the second time cycle differ；
Wherein, the frequency control system gathering converter of pressure stabilizing well type includes:
Obtain the 4th flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the 4th flowing bottomhole pressure (FBHP) of current control period is compared with the secondary ideal flowing bottomhole pressure (FBHP) of current control period in the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset；
If the 4th flowing bottomhole pressure (FBHP) of current control period is more than the secondary ideal flowing bottomhole pressure (FBHP) of current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of current control period is more than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is raised 2%；If the 4th flowing bottomhole pressure (FBHP) of current control period is less than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant；
If the 4th flowing bottomhole pressure (FBHP) of current control period is less than the secondary ideal flowing bottomhole pressure (FBHP) of current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of current control period is less than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is lowered 3%；If the 4th flowing bottomhole pressure (FBHP) of current control period is more than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant.
The embodiment of the present invention mining type according to coal bed gas well, choosing the corresponding time cycle was controlled the frequency gathering converter as the control cycle, and determined that according to the flowing bottomhole pressure (FBHP) of current control period and the desirable flowing bottomhole pressure (FBHP) of current control period the frequency gathering converter adjusts amplitude.Avoid and fluctuate widely owing to frequently adjusting the flowing bottomhole pressure (FBHP) that causes of frequency gathering converter, and avoid and frequently mining equipment is adjusted, and affect the defect in the service life of mining equipment；Improve the production efficiency of mining coal bed gas.
Embodiment two
Embodiments providing the control method of a kind of coal bed gas extraction, referring to Fig. 2, method flow includes:
201: obtain the mining type of coal bed gas well.
Wherein, mining type can include two kinds, is respectively as follows: pressure reduction well type and pressure stabilizing well type.Illustrate for pressure reduction well type in embodiments of the present invention.
202: if the mining type of coal bed gas well is pressure reduction well type, then being a control cycle according to the cycle very first time is controlled the frequency gathering converter.
Wherein, the cycle very first time can be two hours, namely according to every two hours frequency once, the frequency gathering converter is controlled, and each two hour belongs to a control cycle, controls 12 every day.
Whenever entering one and controlling the cycle, namely start the step performing in step 202.
Wherein, the frequency control system gathering converter of pressure reduction well type includes:
2021: obtain the first flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the first flowing bottomhole pressure (FBHP) of current control period is compared with the first ideal well underflow pressure of current control period in the ideal well underflow drops curve preset.
Whenever entering one and controlling the cycle, obtain the flowing bottomhole pressure (FBHP) first flowing bottomhole pressure (FBHP) as current control period of current pressure meter detection.
Wherein, the ideal well underflow drops curve preset is: in the ideal case, precalculate the desirable flowing bottomhole pressure (FBHP) that in this complete control cycle, each control cycle is corresponding, the time that is pressed on by the ideal well underflow corresponding each control cycle again is transverse axis and the coordinate axes weight that flowing bottomhole pressure (FBHP) is the longitudinal axis, carry out line between the desirable flowing bottomhole pressure (FBHP) that each control cycle is corresponding the most at last, obtain the ideal well underflow drops curve preset.As it is shown on figure 3, this there is shown the schematic diagram of flowing bottomhole pressure (FBHP) curve.Wherein, B curve is ideal well underflow drops curve；A curve is the curve under the abnormal condition on ideal well underflow drops curve；C curve is the curve under the abnormal condition under ideal well underflow drops curve.
If the first flowing bottomhole pressure (FBHP) of current control period is more than the first of current control period the desirable flowing bottomhole pressure (FBHP), then perform step 2022；Otherwise, then step 2026 is performed.
2022: if the first flowing bottomhole pressure (FBHP) of current control period is more than the first of current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared.
Wherein, the first control cycle is the cycle of first record flowing bottomhole pressure (FBHP) in the control cycle that this is complete, and the flowing bottomhole pressure (FBHP) ideally recorded in the first control cycle should be the peak in the control cycle that this is complete in all flowing bottomhole pressure (FBHP)s of record.
If the first flowing bottomhole pressure (FBHP) of current control period is more than second flowing bottomhole pressure (FBHP) in first control cycle, then perform step 2023；Otherwise, then step 2024 is performed.
2023: if the first flowing bottomhole pressure (FBHP) of current control period is more than second flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is raised 3%.
2024: if the first flowing bottomhole pressure (FBHP) of current control period is less than second flowing bottomhole pressure (FBHP) in first control cycle, then calculate the Amplitude of Hypotensive of the first flowing bottomhole pressure (FBHP) of current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle.
The previous control cycle is two hours previously recorded flowing bottomhole pressure (FBHP)s in embodiments of the present invention.
Wherein, the mode of the Amplitude of Hypotensive calculating the first flowing bottomhole pressure (FBHP) of current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle is:
Undertaken asking difference operation to obtain flowing bottomhole pressure (FBHP) difference by the first flowing bottomhole pressure (FBHP) of the 3rd flowing bottomhole pressure (FBHP) in previous control cycle Yu current control period；
Undertaken asking business's computing to obtain Amplitude of Hypotensive by flowing bottomhole pressure (FBHP) and the cycle very first time.
2025: if Amplitude of Hypotensive is more than predetermined amplitude, then keep the frequency gathering converter constant；If Amplitude of Hypotensive is less than predetermined amplitude, then the frequency gathering converter is raised 1%.
2026: if the first flowing bottomhole pressure (FBHP) of current control period is less than the first of current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared.
If the first flowing bottomhole pressure (FBHP) of current control period is less than second flowing bottomhole pressure (FBHP) in first control cycle, then perform step 2027；Otherwise, then step 2028 is performed.
2027: if the first flowing bottomhole pressure (FBHP) of current control period is less than second flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is lowered 4%.
2028: if the first flowing bottomhole pressure (FBHP) of current control period is more than second flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant.
The embodiment of the present invention mining type according to coal bed gas well, choosing the corresponding time cycle was controlled the frequency gathering converter as the control cycle, and determined that according to the flowing bottomhole pressure (FBHP) of current control period and the desirable flowing bottomhole pressure (FBHP) of current control period the frequency gathering converter adjusts amplitude.Avoid and fluctuate widely owing to frequently adjusting the flowing bottomhole pressure (FBHP) that causes of frequency gathering converter, and avoid and frequently mining equipment is adjusted, and affect the defect in the service life of mining equipment；Improve the production efficiency of mining coal bed gas.
Embodiment three
Embodiments providing the control method of a kind of coal bed gas extraction, referring to Fig. 4, method flow includes:
401: obtain the mining type of coal bed gas well.
Wherein, mining type can include two kinds, is respectively as follows: pressure reduction well type and pressure stabilizing well type.Illustrate for pressure stabilizing well type in embodiments of the present invention.
402: if the mining type of coal bed gas well is pressure stabilizing well type, then being a control cycle according to the second time cycle is controlled the frequency gathering converter；Wherein, the cycle very first time and the second time cycle differ；
Wherein, the second time cycle can be half an hour, namely according to frequency once per half an hour, the frequency gathering converter was controlled, and per half an hour belongs to a control cycle, controls 48 every day.
Whenever entering one and controlling the cycle, namely start the step performing in step 402.
Wherein, the frequency control system gathering converter of pressure stabilizing well type includes:
4021: obtain the 4th flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the 4th flowing bottomhole pressure (FBHP) of current control period is compared with the secondary ideal flowing bottomhole pressure (FBHP) of current control period in the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset.
Whenever entering one and controlling the cycle, obtain the flowing bottomhole pressure (FBHP) first flowing bottomhole pressure (FBHP) as current control period of current pressure meter detection.
Wherein, the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset is: in the ideal case, under the mining type of pressure stabilizing well type, and desirable flowing bottomhole pressure (FBHP) corresponding to each control cycle should be identical, for default appointment voltage stabilizing flowing bottomhole pressure (FBHP) numerical value.Therefore, the time that is pressed on by the ideal well underflow corresponding each control cycle is transverse axis and the coordinate axes weight that flowing bottomhole pressure (FBHP) is the longitudinal axis, carry out line between the desirable flowing bottomhole pressure (FBHP) that each control cycle is corresponding the most at last, obtain the ideal well underflow drops curve preset.
As it is shown in figure 5, this there is shown the schematic diagram of flowing bottomhole pressure (FBHP) curve.Wherein, F curve is desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve；D curve is the curve under the abnormal condition on desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve；E curve is the curve under the abnormal condition under desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve.
If the 4th flowing bottomhole pressure (FBHP) of current control period is more than the secondary ideal flowing bottomhole pressure (FBHP) of current control period, then perform step 4022；Otherwise, then step 4025 is performed.
4022: if the 4th flowing bottomhole pressure (FBHP) of current control period is more than the secondary ideal flowing bottomhole pressure (FBHP) of current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared；
Wherein, the first control cycle is the cycle of first record flowing bottomhole pressure (FBHP) in the control cycle that this is complete, and the flowing bottomhole pressure (FBHP) ideally recorded in the first control cycle should be identical with the flowing bottomhole pressure (FBHP) of current control period.
If the 4th flowing bottomhole pressure (FBHP) of current control period is more than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then perform step 4023；Otherwise, then step 4024 is performed.
4023: if the 4th flowing bottomhole pressure (FBHP) of current control period is more than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is raised 2%.
4024: if the 4th flowing bottomhole pressure (FBHP) of current control period is less than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant.
4025: if the 4th flowing bottomhole pressure (FBHP) of current control period is less than the secondary ideal flowing bottomhole pressure (FBHP) of current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of current control period Yu first control cycle is compared.
If the 4th flowing bottomhole pressure (FBHP) of current control period is less than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then perform step 4026；Otherwise, then step 4027 is performed.
4026: if the 4th flowing bottomhole pressure (FBHP) of current control period is less than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is lowered 3%.
4027: if the 4th flowing bottomhole pressure (FBHP) of current control period is more than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant.
The embodiment of the present invention mining type according to coal bed gas well, choosing the corresponding time cycle was controlled the frequency gathering converter as the control cycle, and determined that according to the flowing bottomhole pressure (FBHP) of current control period and the desirable flowing bottomhole pressure (FBHP) of current control period the frequency gathering converter adjusts amplitude.Avoid and fluctuate widely owing to frequently adjusting the flowing bottomhole pressure (FBHP) that causes of frequency gathering converter, and avoid and frequently mining equipment is adjusted, and affect the defect in the service life of mining equipment；Improve the production efficiency of mining coal bed gas.
Embodiment four
Embodiments providing the control method of a kind of coal bed gas extraction, referring to Fig. 6, method flow includes:
601: when reentering mining operation after stopping well, obtain each flowing bottomhole pressure (FBHP) of record in current 3rd preset time period；
When running into, in intelligence mining well, powers failure, bottom hole pressure bomb goes wrong, resolve the state such as regulating QI of exitting needs to restart mining operation, then perform this step.Wherein, the 3rd Preset Time is eight hours.
602: according to each the flowing bottomhole pressure (FBHP) averaged got, and set the frequency gathering converter according to meansigma methods.
Before the embodiment of the present invention chooses operation, 8 hourly average frequencies open well, it is to avoid after stopping well in former intelligence mining program, the frequency acquisition inaccurate flowing bottomhole pressure (FBHP) caused fluctuates widely.
Embodiment five
Embodiments providing the control device of a kind of coal bed gas extraction, referring to Fig. 7, this device includes:
First acquisition module 701, for obtaining the mining type of coal bed gas well；
First controls module 702, if being pressure reduction well type for the mining type of coal bed gas well, is then that the control cycle frequency to gathering converter is controlled according to the cycle very first time；
Wherein, first controls module 701, including:
First acquiring unit, for obtaining the first flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and compares the first flowing bottomhole pressure (FBHP) of current control period with the first ideal well underflow pressure of current control period in the ideal well underflow drops curve preset；
First control unit, if being used for first flowing bottomhole pressure (FBHP), the first ideal flowing bottomhole pressure (FBHP) more than current control period of current control period, then compares the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of current control period Yu first control cycle；If the first flowing bottomhole pressure (FBHP) of current control period is more than second flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is raised 3%；If the first flowing bottomhole pressure (FBHP) of current control period is less than second flowing bottomhole pressure (FBHP) in first control cycle, then calculate the Amplitude of Hypotensive of the first flowing bottomhole pressure (FBHP) of current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle；If Amplitude of Hypotensive is more than predetermined amplitude, then keep the frequency gathering converter constant；If Amplitude of Hypotensive is less than predetermined amplitude, then the frequency gathering converter is raised 1%；
Second control unit, if being used for first flowing bottomhole pressure (FBHP), the first ideal flowing bottomhole pressure (FBHP) less than current control period of current control period, then compares the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of current control period Yu first control cycle；If the first flowing bottomhole pressure (FBHP) of current control period is less than second flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is lowered 4%；If the first flowing bottomhole pressure (FBHP) of current control period is more than second flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant；
Second controls module 703, if being pressure stabilizing well type for the mining type of coal bed gas well, is then that the control cycle frequency to gathering converter is controlled according to the second time cycle；Wherein, the cycle very first time and the second time cycle differ；
Wherein, the second control module 703 includes:
Second acquisition unit, for obtaining the 4th flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and compares the 4th flowing bottomhole pressure (FBHP) of current control period with the secondary ideal flowing bottomhole pressure (FBHP) of current control period in the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset；
3rd control unit, if for the 4th flowing bottomhole pressure (FBHP) of current control period more than the secondary ideal flowing bottomhole pressure (FBHP) of current control period, then compared the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of current control period Yu first control cycle；If the 4th flowing bottomhole pressure (FBHP) of current control period is more than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is raised 2%；If the 4th flowing bottomhole pressure (FBHP) of current control period is less than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant；
4th control unit, if for the 4th flowing bottomhole pressure (FBHP) of current control period less than the secondary ideal flowing bottomhole pressure (FBHP) of current control period, then compared the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of current control period Yu first control cycle；If the 4th flowing bottomhole pressure (FBHP) of current control period is less than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then the frequency gathering converter is lowered 3%；If the 4th flowing bottomhole pressure (FBHP) of current control period is more than the 5th flowing bottomhole pressure (FBHP) in first control cycle, then keep the frequency gathering converter constant.
Wherein, the first control unit also includes:
First operator unit, for being undertaken asking difference operation to obtain flowing bottomhole pressure (FBHP) difference by the 3rd flowing bottomhole pressure (FBHP) in previous control cycle and the first flowing bottomhole pressure (FBHP) of current control period；
Second operator unit, for being undertaken asking business's computing to obtain Amplitude of Hypotensive by flowing bottomhole pressure (FBHP) and the cycle very first time.
Wherein, the cycle very first time is two hours；Second time cycle was half an hour.
Wherein, device also includes:
Second acquisition module 704, when reentering mining operation after being used for stopping well, obtains each flowing bottomhole pressure (FBHP) of record in current 3rd preset time period；
Setting module 705, for each flowing bottomhole pressure (FBHP) averaged that basis gets, and sets the frequency gathering converter according to meansigma methods.
Wherein, the 3rd Preset Time is eight hours.
The embodiment of the present invention mining type according to coal bed gas well, choosing the corresponding time cycle was controlled the frequency gathering converter as the control cycle, and determined that according to the flowing bottomhole pressure (FBHP) of current control period and the desirable flowing bottomhole pressure (FBHP) of current control period the frequency gathering converter adjusts amplitude.Avoid and fluctuate widely owing to frequently adjusting the flowing bottomhole pressure (FBHP) that causes of frequency gathering converter, and avoid and frequently mining equipment is adjusted, and affect the defect in the service life of mining equipment；Improve the production efficiency of mining coal bed gas.
It addition, 8 hourly average frequencies open well before the embodiment of the present invention chooses operation, it is to avoid after stopping well in former intelligence mining program, the inaccurate flowing bottomhole pressure (FBHP) caused of frequency acquisition fluctuates widely.
The invention described above embodiment sequence number, just to describing, does not represent the quality of embodiment.
One of ordinary skill in the art will appreciate that all or part of step realizing above-described embodiment can be completed by hardware, can also be completed by the hardware that program carrys out instruction relevant, program can be stored in a kind of computer-readable recording medium, storage medium mentioned above can be read only memory, disk or CD etc..
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, all within the spirit and principles in the present invention, any amendment of making, equivalent replacement, improvement etc., should be included within protection scope of the present invention.
Claims (10)
1. the control method of a coal bed gas extraction, it is characterised in that described method includes:
Obtain the exploitation type of coal bed gas well；
If the mining type of described coal bed gas well is pressure reduction well type, then being a control cycle according to the cycle very first time is controlled the frequency gathering converter；
Wherein, the frequency control system gathering converter of described pressure reduction well type includes:
Obtain the first flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the first flowing bottomhole pressure (FBHP) of described current control period is compared with the first ideal well underflow pressure of current control period in the ideal well underflow drops curve preset；
If the first flowing bottomhole pressure (FBHP) of described current control period is more than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 3%；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then calculate the Amplitude of Hypotensive of the first flowing bottomhole pressure (FBHP) of described current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle；If described Amplitude of Hypotensive is more than predetermined amplitude, then the frequency keeping described collection converter is constant；If described Amplitude of Hypotensive is less than predetermined amplitude, then the frequency of described collection converter is raised 1%；
If the first flowing bottomhole pressure (FBHP) of described current control period is less than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 4%；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
If the mining type of described coal bed gas well is pressure stabilizing well type, then being a control cycle according to the second time cycle is controlled the frequency gathering converter；Wherein, the described cycle very first time and described second time cycle differ；
Wherein, the frequency control system gathering converter of described pressure stabilizing well type includes:
Obtain the 4th flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the 4th flowing bottomhole pressure (FBHP) of described current control period is compared with the secondary ideal flowing bottomhole pressure (FBHP) of current control period in the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset；
If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 2%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 3%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant.
2. method according to claim 1, it is characterised in that the Amplitude of Hypotensive of the 3rd flowing bottomhole pressure (FBHP) in the first flowing bottomhole pressure (FBHP) of the described current control period of described calculating and previous control cycle, including:
Undertaken asking difference operation to obtain flowing bottomhole pressure (FBHP) difference by described 3rd flowing bottomhole pressure (FBHP) in previous control cycle and the first flowing bottomhole pressure (FBHP) of described current control period；
Undertaken asking business's computing to obtain Amplitude of Hypotensive by described flowing bottomhole pressure (FBHP) and the described cycle very first time.
3. method according to claim 1, it is characterised in that the described cycle very first time is two hours；Described second time cycle is half an hour.
4. method according to claim 1, it is characterised in that described method also includes:
When reentering mining operation after stopping well, obtain each flowing bottomhole pressure (FBHP) of record in current 3rd preset time period；
According to each the flowing bottomhole pressure (FBHP) averaged got, and set the frequency of described collection converter according to described meansigma methods.
5. method according to claim 4, it is characterised in that described 3rd Preset Time is eight hours.
6. the control device of a coal bed gas extraction, it is characterised in that described device includes:
First acquisition module, for obtaining the mining type of coal bed gas well；
First controls module, if being pressure reduction well type for the mining type of described coal bed gas well, is then that the control cycle frequency to gathering converter is controlled according to the cycle very first time；
Wherein, described first controls module, including:
First acquiring unit, for obtaining the first flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the first flowing bottomhole pressure (FBHP) of described current control period is compared with the first ideal well underflow pressure of current control period in the ideal well underflow drops curve preset；
First control unit, if for the first flowing bottomhole pressure (FBHP) of described current control period more than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 3%；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then calculate the Amplitude of Hypotensive of the first flowing bottomhole pressure (FBHP) of described current control period and the 3rd flowing bottomhole pressure (FBHP) in previous control cycle；If described Amplitude of Hypotensive is more than predetermined amplitude, then the frequency keeping described collection converter is constant；If described Amplitude of Hypotensive is less than predetermined amplitude, then the frequency of described collection converter is raised 1%；
Second control unit, if for the first flowing bottomhole pressure (FBHP) of described current control period less than the first of described current control period the desirable flowing bottomhole pressure (FBHP), then the second flowing bottomhole pressure (FBHP) of the first flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the first flowing bottomhole pressure (FBHP) of described current control period is less than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 4%；If the first flowing bottomhole pressure (FBHP) of described current control period is more than second flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
Second controls module, if being pressure stabilizing well type for the mining type of described coal bed gas well, is then that the control cycle frequency to gathering converter is controlled according to the second time cycle；Wherein, the described cycle very first time and described second time cycle differ；
Wherein, described second control module includes:
Second acquisition unit, for obtaining the 4th flowing bottomhole pressure (FBHP) of the current control period of piezometer detection, and the 4th flowing bottomhole pressure (FBHP) of described current control period is compared with the secondary ideal flowing bottomhole pressure (FBHP) of current control period in the desirable flowing bottomhole pressure (FBHP) voltage stabilizing curve preset；
3rd control unit, if for the 4th flowing bottomhole pressure (FBHP) of described current control period more than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is raised 2%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant；
4th control unit, if for the 4th flowing bottomhole pressure (FBHP) of described current control period less than the secondary ideal flowing bottomhole pressure (FBHP) of described current control period, then the 5th flowing bottomhole pressure (FBHP) of the 4th flowing bottomhole pressure (FBHP) of described current control period Yu described first control cycle is compared；If the 4th flowing bottomhole pressure (FBHP) of described current control period is less than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency of described collection converter is lowered 3%；If the 4th flowing bottomhole pressure (FBHP) of described current control period is more than the 5th flowing bottomhole pressure (FBHP) in described first control cycle, then the frequency keeping described collection converter is constant.
7. device according to claim 6, it is characterised in that described first control unit also includes:
First operator unit, for being undertaken asking difference operation to obtain flowing bottomhole pressure (FBHP) difference by described 3rd flowing bottomhole pressure (FBHP) in previous control cycle and the first flowing bottomhole pressure (FBHP) of described current control period；
Second operator unit, for being undertaken asking business's computing to obtain Amplitude of Hypotensive by described flowing bottomhole pressure (FBHP) and the described cycle very first time.
8. device according to claim 6, it is characterised in that the described cycle very first time is two hours；Described second time cycle is half an hour.
9. device according to claim 6, it is characterised in that described device also includes:
Second acquisition module, when reentering mining operation after being used for stopping well, obtains each flowing bottomhole pressure (FBHP) of record in current 3rd preset time period；
Setting module, for each flowing bottomhole pressure (FBHP) averaged that basis gets, and sets the frequency of described collection converter according to described meansigma methods.
10. device according to claim 9, it is characterised in that described 3rd Preset Time is eight hours.
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| CN201410787785.1A CN105756624A (en) | 2014-12-17 | 2014-12-17 | Coal bed methane drainage and production control method and device |
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