CN108626579A - A kind of oil pipeline wax deposition quantity measuring method based on pressure wave method - Google Patents
A kind of oil pipeline wax deposition quantity measuring method based on pressure wave method Download PDFInfo
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- CN108626579A CN108626579A CN201810301038.0A CN201810301038A CN108626579A CN 108626579 A CN108626579 A CN 108626579A CN 201810301038 A CN201810301038 A CN 201810301038A CN 108626579 A CN108626579 A CN 108626579A
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- wax deposition
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
A kind of oil pipeline wax deposition quantity measuring method based on pressure wave method, belongs to hydrodynamics studying technological domain.When the fluid in pipeline fully develops, after fluidised form reaches turbulent, transient flow is generated in the duct in the valve of t moment quick closedown pipe downstream, traveling to wax deposition section right hand edge in t+ time Δt surge waves reflects；Using the incidence wave of wax deposition section right edge and back wave as research object, incidence wave Δ H when transient state is obtainedWWith back wave Δ HFSize can find out the size of wax deposition area.It is an advantage of the invention that：The method that theoretically further research determines blocking amount with pressure wave method, realization recognizes wax deposition amount with pressure wave method, this method can effectively detect wax deposition amount, unimpeded operation is carried out for manager, and significant tutorial message is provided, economic loss caused by greatly reducing the human and material resources loss in unimpeded work and blocking, has practical significance to detect line clogging problem.
Description
Technical field
The invention belongs to hydrodynamics studying technological domains, and in particular to a kind of oil pipeline wax deposition based on pressure wave method
Quantity measuring method.
Background technology
Usually said " wax deposition " actually refers to the paraffin that deposited a certain thickness in inner wall of the pipe, colloid, solidifying oil, sand
With the mixture of other mechanical admixtures.Due to wax deposition, internal diameter of the pipeline is made to become smaller, pipeline increases along journey frictional resistance, conveying
Ability declines.In order to ensure the conveying capacity of pipeline, pipeline will periodically carry out pigging, and the size of wax deposition amount is to formulating pigging week
Phase plays decisive action.It is limited to current measuring technique, there are no the formula of fairly perfect description inner wall of the pipe wax deposition, if knot
Wax amount is unknown, and when pigging is likely to result in the unnecessary wasting of resources.Therefore, a kind of technology that can detect wax deposition amount size is urgently
It need to research and develop and come into operation.
Invention content
The purpose of the present invention is to solve the methods currently without a kind of cured amount of effective detection knot, and then having when pigging can
The problem of capable of causing the unnecessary wasting of resources, provides a kind of oil pipeline wax deposition quantity measuring method based on pressure wave method, the party
Method is effective, practical.
To achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of oil pipeline wax deposition quantity measuring method based on pressure wave method, the method are specific as follows：
When the fluid in pipeline fully develops, after fluidised form reaches turbulent, in the valve of t moment quick closedown pipe downstream,
Valve opening or closing used time are not more than 0.15s, pressure wave speed a=1000m/s, then distance L of the valve apart from wax deposition section is answered
Meet：2L/a<T, therefore the distance that L distances block section should be less than 75m；Transient flow is generated in the duct, in t+ time Δt water attacks
Wave travels to wax deposition section right hand edge and reflects；Using the incidence wave of wax deposition section right edge and back wave as research object, and neglect
Slightly local resistance loss caused by reducing；
Corresponding compatibility condition is listed along characteristic curve feature based collimation method；
Hj=H0-B1(Qj-Q0) (1)
Hj=HW+B2(Qj-QW) (2)
HW=H0-B2(QW-Q0) (3)
In above formula, HjFor the amplitude at blocking position, m；H0For valve local resistance loss, m；QjAt blocking position
Flow, m3/s；Q0Reach flow when turbulent, m for flowing3/s；HWFor the amplitude of incidence wave, m；QWFor the stream after blocking position
Amount, m3/s；B is computational constant,Wherein, a is pressure wave speed, and g is acceleration of gravity, and A takes A respectively1, A2, obtain
B1, B2, A1For the cross-sectional area of line clogging section, m2；A2For the cross-sectional area of other pipeline sections, m2；
The then amplitude Δ H of total reflection waveR, back wave amplitude Δ HF, transmitted wave amplitude Δ HTWith the amplitude of total incidence wave
ΔHWSize be respectively：ΔHR=Hj-H0, Δ HF=Hj-Hw, Δ HT=Hj-H0, Δ HW=HW-H0, in this characteristic curve situation
Under, Δ HRWith Δ HTCalculation formula it is identical；
Formula (1)~formula (3) arranges：(B1+B2)Qj=H0-HW+B2QW+B1Q0(4)
It is obtained by formula (3),
Formula (6) is brought into formula (5) to obtain：
And because
Formula (7) is substituted into formula (8) and is obtained,
And because
Then (9) formula, which can arrange, is：
In above formula (10), A1For the cross-sectional area of line clogging section, m2；A2For the cross-sectional area of other pipeline sections, m2；According to
The amplitude Δ H of total incidence wave in the formulaWWith the amplitude Δ H of back waveFSize can find out the cross-sectional area of line clogging section
A1, and then find out the size of blocked area.
The advantageous effect of the present invention compared with the existing technology is：Theoretically further research is true with pressure wave method by the present invention
Determine the method for wax deposition blocking amount, realization recognizes wax deposition amount with pressure wave method, and this method can effectively detect wax deposition amount, for pipe
Reason person carries out unimpeded operation and provides significant tutorial message, greatly reduces the human and material resources loss in unimpeded work and blocks
Caused economic loss has practical significance to detect line clogging problem.
Description of the drawings
Fig. 1 is present invention detection wax deposition amount size schematic diagram；
Fig. 2 is wax deposition amount detecting device schematic diagram of the present invention.
Specific implementation mode
Technical scheme of the present invention is further described below in conjunction with the accompanying drawings, however, it is not limited to this, every to this
Inventive technique scheme is modified or equivalent replacement, without departing from the spirit of the technical scheme of the invention range, should all cover at this
Among the protection domain of invention.
Specific implementation mode one：What present embodiment was recorded is that a kind of oil pipeline wax deposition measurement based on pressure wave method is fixed
Method, the method are specific as follows：
When the fluid in pipeline fully develops, after fluidised form reaches turbulent, in the valve of t moment quick closedown pipe downstream,
Valve opening or closing used time are not more than 0.15s, pressure wave speed a=1000m/s, then distance L of the valve apart from wax deposition section is answered
Meet：2L/a ＞ t, therefore the distance that L distances block section should be greater than 75m；Transient flow is generated in the duct, in t+ time Δt water
It hits wave and travels to wax deposition section right hand edge and reflect；The wave that Fig. 1 illustrates wax deposition section right end transmits situation.The cross of wax deposition section
Sectional area is A1, the cross-sectional area of other pipeline sections is A2, flow when flowing reaches turbulent is Q0.T moment is quick in pipe end
It closes valve and generates transition, travel to wax deposition section right hand edge in t+ time Δt surge waves and reflect.With wax deposition section in derivation
The incidence wave and back wave of right edge are research object, and ignore local resistance loss caused by reducing；
Corresponding compatibility condition is listed along characteristic curve feature based collimation method；
Hj=H0-B1(Qj-Q0) (1)
Hj=HW+B2(Qj-QW) (2)
HW=H0-B2(QW-Q0) (3)
In above formula, HjFor the amplitude at blocking position, m；H0For valve local resistance loss, m；QjAt blocking position
Flow, m3/s；Q0Reach flow when turbulent, m for flowing3/s；HWFor the amplitude of incidence wave, m；QWFor the stream after blocking position
Amount, m3/s；B is computational constant,Wherein, a is pressure wave speed, and g is acceleration of gravity, and A takes A respectively1, A2, obtain
B1, B2, A1For the cross-sectional area of line clogging section, m2；A2For the cross-sectional area of other pipeline sections, m2；
The then amplitude Δ H of total reflection waveR, back wave amplitude Δ HF, transmitted wave amplitude Δ HTWith the amplitude of total incidence wave
ΔHWSize be respectively：ΔHR=Hj-H0, Δ HF=Hj-Hw, Δ HT=Hj-H0, Δ HW=HW-H0, in this characteristic curve situation
Under, Δ HRWith Δ HTCalculation formula it is identical；
Formula (1)~formula (3) arranges：(B1+B2)Qj=H0-HW+B2QW+B1Q0 (4)
It is obtained by formula (3),
Formula (6) is brought into formula (5) to obtain：
And because
Formula (7) is substituted into formula (8) and is obtained,
And because
Then (9) formula, which can arrange, is：
In above formula (10), A1For the cross-sectional area of line clogging section, m2；A2For the cross-sectional area of other pipeline sections, m2；According to
The amplitude Δ H of total incidence wave in the formulaWWith the amplitude Δ H of back waveFSize can find out the cross-sectional area of line clogging section
A1, and then the size of blocked area is found out, and the size of wax deposition area is unrelated with condition when initial turbulent.
Fig. 2 show wax deposition amount detecting device schematic diagram.The present apparatus generates excitation by rapid switching valve, in test point
Pressure wave is detected, (system is combined detection method, and pipeline with SCADA (data acquisition analysis system is the prior art)
Have the point of multiple device valves, therefore multiple test points can be set and be detected), and pass detection signal back control system.This
The control system of device includes computer and display.Computer is calculated, display is based on showing for receiving signal
Calculate result.
Determine best scraper-running frequency.
By wax deposition amount area formula
In the blocked area A for measuring certain section of pipeline1, while also having determined that the equivalent wax deposition thickness δ of pipelinedL, therefore manage
Diameter is by original D0It is reduced to D0-2δdL, cause frictional resistance to increase, flow is reduced.Rule of thumb and studies have shown that this implementation determines
Pigging is carried out when caliber is reduced to the 1/7 of former caliber, scraper-running frequency at this time is for best scraper-running frequency.
The oil pipeline detection technique of the present invention includes oil pipeline wax deposition model, and wax deposition amount determines method, the inspection of wax deposition amount
Device is surveyed, determines method best scraper-running frequency.
The present invention carries out traditional pressure wave method further on the basis of studying pressure wave propagation law in the duct
Research, theoretically calculates the specific relationship between wax deposition amount and pressure jump amount.As can be seen that pressure wave method only passes through
Wax deposition problem can be recognized, and only needed to pipe with Sudden Changing Rate at the time of first transient pressure wave is mutated
The pressure of fluid is detected in road, and simple and practicable and precision is higher, and can be determined according to the wax deposition amount being calculated best
Reduce to a certain extent and lost caused by pigging scraper-running frequency.
Claims (1)
1. a kind of oil pipeline wax deposition quantity measuring method based on pressure wave method, it is characterised in that：The method is specific as follows：
When the fluid in pipeline fully develops, after fluidised form reaches turbulent, in the valve of t moment quick closedown pipe downstream, valve
Be turned on and off the used time be not more than 0.15s, pressure wave speed a=1000m/s, then distance L of the valve apart from wax deposition section should meet：
2L/a ＞ t, therefore the distance that L distances block section should be greater than 75m；Transient flow is generated in the duct, is passed in t+ time Δt surge waves
Wax deposition section right hand edge is multicast to reflect；Using the incidence wave of wax deposition section right edge and back wave as research object, and ignore change
Local resistance loss caused by diameter；
Corresponding compatibility condition is listed along characteristic curve feature based collimation method；
Hj=H0-B1(Qj-Q0) (1)
Hj=HW+B2(Qj-QW) (2)
HW=H0-B2(QW-Q0) (3)
In above formula, HjFor the amplitude at blocking position, m；H0For valve local resistance loss, m；QjFor the flow at blocking position,
m3/s；Q0Reach flow when turbulent, m for flowing3/s；HWFor the amplitude of incidence wave, m；QWFor the flow after blocking position, m3/
s；B is computational constant,Wherein, a is pressure wave speed, and g is acceleration of gravity, and A takes A respectively1, A2, obtain B1, B2,
A1For the cross-sectional area of line clogging section, m2；A2For the cross-sectional area of other pipeline sections, m2；
The then amplitude Δ H of total reflection waveR, back wave amplitude Δ HF, transmitted wave amplitude Δ HTWith the amplitude Δ H of total incidence waveW
Size be respectively：ΔHR=Hj-H0, Δ HF=Hj-Hw, Δ HT=Hj-H0, Δ HW=HW-H0, in this characteristic curve, Δ
HRWith Δ HTCalculation formula it is identical；
Formula (1)~formula (3) arranges：(B1+B2)Qj=H0-HW+B2QW+B1Q0 (4)
It is obtained by formula (3),
Formula (6) is brought into formula (5) to obtain：
And because
Formula (7) is substituted into formula (8) and is obtained,
And because
Then (9) formula, which can arrange, is：
In above formula (10), A1For the cross-sectional area of line clogging section, m2；A2For the cross-sectional area of other pipeline sections, m2；According in the formula
The amplitude Δ H of total incidence waveWWith the amplitude Δ H of back waveFSize can find out the cross-sectional area A of line clogging section1, in turn
Find out the size of blocked area.
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| CN201810301038.0A CN108626579A (en) | 2018-04-04 | 2018-04-04 | A kind of oil pipeline wax deposition quantity measuring method based on pressure wave method |
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| CN201810301038.0A CN108626579A (en) | 2018-04-04 | 2018-04-04 | A kind of oil pipeline wax deposition quantity measuring method based on pressure wave method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109780447A (en) * | 2018-12-28 | 2019-05-21 | 大连理工大学 | A method of using stopping state in pulsed pressure wave detection pressure pipeline |
| CN113551699A (en) * | 2021-09-17 | 2021-10-26 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109780447A (en) * | 2018-12-28 | 2019-05-21 | 大连理工大学 | A method of using stopping state in pulsed pressure wave detection pressure pipeline |
| CN113551699A (en) * | 2021-09-17 | 2021-10-26 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
| CN113551699B (en) * | 2021-09-17 | 2022-01-11 | 山东德仕化工有限公司 | Method and equipment for detecting blockage of oil well pipeline |
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Application publication date: 20181009 |
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