CN104329566A - Differential pressure principle-based slug flow detection method and device - Google Patents
Differential pressure principle-based slug flow detection method and device Download PDFInfo
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- CN104329566A CN104329566A CN201410586523.9A CN201410586523A CN104329566A CN 104329566 A CN104329566 A CN 104329566A CN 201410586523 A CN201410586523 A CN 201410586523A CN 104329566 A CN104329566 A CN 104329566A
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Abstract
The invention relates to a differential pressure principle-based slug flow detection method and device. The device is characterized by comprising differential pressure type liquid level transmitters, a horizontal straight pipeline and a signal processor, wherein the differential pressure type liquid level transmitters are electrically connected with the same signal processor respectively. The detection method comprises the following steps: (1) arranging at least two groups of differential pressure type liquid level transmitters on the horizontal straight pipeline; (2) transmitting the liquid level of a fluid which flows through the horizontal straight pipeline to the signal processor; (3) confirming generation of a slug flow; (4) confirming attenuation of the slug flow; (5) calculating the flow speed of a liquid column of the slug flow through the known distance of the two groups of differential pressure type liquid level transmitters; (6) calculating the length of the liquid column according to the generation, the attenuation time interval and the flow speed of the liquid column of the slug flow. According to the method and the device, whether the slug flow occurs in the pipeline can be detected, the length and the flow speed of the liquid column of the slug flow can be detected in the pipeline, and the method and the device can be widely applied to slug flow detection processes of various pipelines.
Description
Technical field
The present invention relates to a kind of oil and gas pipes detecting method and device, particularly about a kind of slug flow detecting method based on differential pressure principle for pipe-line and device.
Background technique
In oil gas field is produced, because the reasons such as landform, pigging operation and fluid dynamic can produce slug flow in the pipeline of oil and gas multiphase flow.Slug flow is a kind of common flow pattern in multiphase transportation pipeline, and refer to gas and liquid alternatedly to flow in the duct, the liquid plug being full of whole pipeline area can be split by air mass, and along Flows below air mass is interface film.This flow pattern belongs to flow instabilities, can cause the rapid fluctuation of the instantaneous flow of ducted pressure and gas-liquid, meanwhile, also can cause the sharp pounding of pipeline, thus causes larger impact to the operation in downstream and equipment, even causes production accident.At present, in domestic most gathering line, all there is no construction section plug flow detection device, and in oil gas field is produced, if can not judge in advance during segment occurred plug flow, and take measures aborning, will affect greatly the normal operation of remaining production equipment.So, in order to ensure optimum design and the operation of pipeline and downstream oil vapor treatment equipment, need to provide a kind of can the method for segment occurred plug flow and device in testing pipes.
Summary of the invention
For the problems referred to above, the object of this invention is to provide one can whether segment occurred plug flow in testing pipes, and can at the slug flow detecting method based on differential pressure principle of pipeline detection slug flow liquid column length and flow velocity and device.
For achieving the above object, the present invention takes following technological scheme: a kind of slug flow detecting method based on differential pressure principle, comprise the following steps: 1) on the horizontal straight tube road of one section of multiphase transportation pipeline, interval arranges the two group liquid level transducer of differential pressure types of distance for L, and two groups of liquid level transducer of differential pressure types is electrically connected respectively same signal processor; 2) fluid enters horizontal straight tube road and flows through two groups of liquid level transducer of differential pressure types, the liquid level flowing through horizontal straight tube road fluid is sent to signal processor by two groups of liquid level transducer of differential pressure types respectively, is judged whether to there occurs slug flow to liquid level data by signal processor; 3) when the time is t1, the liquid level transducer of differential pressure type be positioned at above detects that actual liquid level is 100%, then suppose now to create slug flow; Then, when the time is t2, the liquid level transducer of differential pressure type be positioned at below equally also detects that liquid level is 100%, then can confirm, from time t1, really to create slug flow in pipeline; 4) when the time is t3, the liquid level transducer of differential pressure type be positioned at above detects actual liquid level <95%, then suppose that now slug flow has started decay; Then, when the time is t4, the liquid level transducer of differential pressure type be positioned at below equally also detects liquid level <95%, then can confirm that now slug flow is decayed; 5) because two groups of liquid level transducer of differential pressure type distance L are known, therefore the flow velocity v of slug flow fluid column is:
6) time lag between the time t4 decayed to slug flow fluid column according to the time t1 of the generation of slug flow fluid column and by step 5) the flow velocity v of slug flow fluid column that obtains, calculate the length L1 of slug flow fluid column:
L1＝v(t4-t1)。
Described step 1) in liquid level transducer of differential pressure type be spaced three groups and more than.
A kind of slug flow detection device based on differential pressure principle, it is characterized in that: it comprises the horizontal straight tube road of one section of multiphase transportation pipeline, it is arranged at intervals with two groups of liquid level transducer of differential pressure types, and two groups of liquid level transducer of differential pressure types are electrically connected same signal processor respectively; Described in two groups, each group of liquid level transducer of differential pressure type is two, and is separately positioned on the upper and lower of the same diameter in described horizontal straight tube road.
Described horizontal straight tube road is the straight-run of pipe road in a multiphase transportation pipeline.
Described liquid level transducer of differential pressure type be spaced three groups and more than.
Described signal processor adopts programmable controller PLC.
Described signal processor adopts digital signal processor DSP.
The present invention is owing to taking above technological scheme, it has the following advantages: 1, the present invention is owing to providing a kind of detection device at pipeline detection pipe section plug flow, can the length of detection segment plug flow fluid column and speed, and the information such as time that slug flow occurs, for the production separator of subsequent technique and the feedforward control of slug catcher provide relevant parameter, thus greatly reduce the possibility of way of escape generation device fabrication problem.2, the present invention is owing to the generation of slug flow can be detected, not only can provide foundation and Data support for pigging operation, and can provide Data support for the transformation of oil gas field later stage collection transfer device and optimization.The present invention can be widely used in the slug flow testing process of various pipeline.
Accompanying drawing explanation
Fig. 1 is the structural representation of slug flow detection device of the present invention, and wherein, 1 represents one group of liquid level transducer of differential pressure type, and 2 represent one group of liquid level transducer of differential pressure type, and 3 represent horizontal straight tube road, and 4 represent signal processor.
Embodiment
As shown in Figure 1, apparatus of the present invention at least comprise two groups of liquid level transducer of differential pressure types 1,2, and it is disposed on one section of horizontal straight tube road 3, and horizontal straight tube road 3 is one section of horizontal liquid conveying straight pipeline on pipeline.Each group of two groups of liquid level transducer of differential pressure types 1,2 is respectively two, is arranged on top and the bottom of the same radial direction in horizontal straight tube road accordingly.Two groups of liquid level transducer of differential pressure type 1,2 standoff distances are L, two groups of liquid level transducer of differential pressure types 1,2 are electrically connected same signal processor 4 respectively, signal processor 4 adopts programmable controller PLC or digital signal processor DSP, and signal processor 4 is by determining whether segment occurred plug flow to the analysis of each liquid level transducer of differential pressure type 1,2 signal.
In above-described embodiment, the quantity of liquid level transducer of differential pressure type can also be more than three groups or three groups.
The slug flow detecting method that the present invention is based on differential pressure principle comprises the following steps:
1) two groups of liquid level transducer of differential pressure types, 1,2, two groups of liquid level transducer of differential pressure types 1,2 that interval is arranged apart from being L on the horizontal straight tube road 3 of one section of multiphase transportation pipeline connect same signal processor 4 respectively;
2) fluid enters horizontal straight tube road 3 and flows through two groups of liquid level transducer of differential pressure types 1,2, two groups of liquid level transducer of differential pressure types 1,2 will flow through the cycle of liquid level according to setting of horizontal straight tube road 3 fluid respectively, be sent to signal processor 4, judged whether to there occurs slug flow by signal processor 4 pairs of liquid level data;
3) when the time is t1, the liquid level transducer of differential pressure type 1 be positioned at above detects that actual liquid level is 100%, then suppose now to create slug flow; Then, when the time is t2, the liquid level transducer of differential pressure type 2 be positioned at below equally also detects the liquid level of 100%, then can confirm, from time t1, really to create slug flow in pipeline;
4) when the time is t3, the liquid level transducer of differential pressure type 1 be positioned at above detects actual liquid level <95%, then suppose that now slug flow has started decay; Then, when the time is t4, the liquid level transducer of differential pressure type 2 be positioned at below equally also detects liquid level <95%, then can confirm that now slug flow is decayed;
5) because two groups of liquid level transducer of differential pressure types 1,2 distance L is known, therefore the flow velocity v of slug flow fluid column is:
6) time lag between the time t4 decayed to slug flow fluid column according to the time t1 of the generation of slug flow fluid column and by step 5) the flow velocity v of slug flow fluid column that obtains, be multiplied be the length L1 of this section of slug flow fluid column with decay time difference (t4-t1) of producing with slug flow of flow velocity v and the slug flow of slug flow:
L1＝v(t4-t1)。
In above-described embodiment, when liquid level transducer of differential pressure type is more than three groups or three groups, by second group of later liquid level transducer of differential pressure type, the mode of slug flow can be verified, verify that slug flow occurs more accurately to obtain.
The inventive method just applies generation and the decay of liquid level pressure differential method measuring section plug flow, and then obtain flow velocity and the liquid column length of disconnecting plug, detect according to these and calculate data, foundation can be provided for the safe operation of the optimum design and operation pipeline that ensure pipeline and downstream oil vapor treatment equipment.The inventive method is set forth in theory, but operating mode more complicated when occurring because slug flow is actual, some air mass are had in such as slug flow fluid column, or because the not equal reason of physical properties of fluids there will be various different situation, some mathematical methods can be adopted in actual applications to revise formula, to ensure that testing result and actual conditions are according to meeting.
The various embodiments described above are only for illustration of the present invention; wherein structure, the Placement of each parts; and to run and calculation procedure etc. all can change to some extent, every equivalents of carrying out on the basis of technical solution of the present invention and improvement, all should not get rid of outside protection scope of the present invention.
Claims (9)
1., based on a slug flow detecting method for differential pressure principle, comprise the following steps:
1) on the horizontal straight tube road of one section of multiphase transportation pipeline, interval arranges the two group liquid level transducer of differential pressure types of distance for L, and two groups of liquid level transducer of differential pressure types is electrically connected respectively same signal processor;
2) fluid enters horizontal straight tube road and flows through two groups of liquid level transducer of differential pressure types, the liquid level flowing through horizontal straight tube road fluid is sent to signal processor by two groups of liquid level transducer of differential pressure types respectively, is judged whether to there occurs slug flow to liquid level data by signal processor;
3) when the time is t1, the liquid level transducer of differential pressure type be positioned at above detects that actual liquid level is 100%, then suppose now to create slug flow; Then, when the time is t2, the liquid level transducer of differential pressure type be positioned at below equally also detects that liquid level is 100%, then can confirm, from time t1, really to create slug flow in pipeline;
4) when the time is t3, the liquid level transducer of differential pressure type be positioned at above detects actual liquid level <95%, then suppose that now slug flow has started decay; Then, when the time is t4, the liquid level transducer of differential pressure type be positioned at below equally also detects liquid level <95%, then can confirm that now slug flow is decayed;
5) because two groups of liquid level transducer of differential pressure type distance L are known, therefore the flow velocity v of slug flow fluid column is:
6) time lag between the time t4 decayed to slug flow fluid column according to the time t1 of the generation of slug flow fluid column and by step 5) the flow velocity v of slug flow fluid column that obtains, calculate the length L1 of slug flow fluid column:
L1＝v(t4-t1)。
2. a kind of slug flow detecting method based on differential pressure principle as claimed in claim 1, is characterized in that: described step 1) in liquid level transducer of differential pressure type be spaced three groups and more than.
3. one kind realizes the slug flow detection device based on differential pressure principle of method as claimed in claim 1 or 2, it is characterized in that: it comprises the horizontal straight tube road of one section of multiphase transportation pipeline, it is arranged at intervals with two groups of liquid level transducer of differential pressure types, and two groups of liquid level transducer of differential pressure types are electrically connected same signal processor respectively; Described in two groups, each group of liquid level transducer of differential pressure type is two, and is separately positioned on the upper and lower of the same diameter in described horizontal straight tube road.
4. a kind of slug flow detection device based on differential pressure principle as claimed in claim 3, is characterized in that: described horizontal straight tube road is the straight-run of pipe road in a multiphase transportation pipeline.
5. a kind of slug flow detection device based on differential pressure principle as claimed in claim 3, is characterized in that: described liquid level transducer of differential pressure type be spaced three groups and more than.
6. a kind of slug flow detection device based on differential pressure principle as claimed in claim 4, is characterized in that: described liquid level transducer of differential pressure type be spaced three groups and more than.
7. a kind of slug flow detection device based on differential pressure principle as described in claim 3 or 4 or 5 or 6, is characterized in that: described signal processor adopts programmable controller PLC.
8. a kind of slug flow detection device based on differential pressure principle as described in claim 3 or 4 or 5 or 6, is characterized in that: described signal processor adopts digital signal processor DSP.
9. a kind of slug flow detection device based on differential pressure principle as claimed in claim 7, is characterized in that: described signal processor adopts digital signal processor DSP.
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| CN201410586523.9A CN104329566A (en) | 2014-10-28 | 2014-10-28 | Differential pressure principle-based slug flow detection method and device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897364A (en) * | 2015-06-16 | 2015-09-09 | 中国海洋石油总公司 | Method for determining gas-liquid two-phase hydrodynamic slug flow in horizontal and micro-inclined pipes |
| CN106932185A (en) * | 2017-03-15 | 2017-07-07 | 中国海洋石油总公司 | A kind of slug catcher sand deposition and separating property test system and method |
-
2014
- 2014-10-28 CN CN201410586523.9A patent/CN104329566A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104897364A (en) * | 2015-06-16 | 2015-09-09 | 中国海洋石油总公司 | Method for determining gas-liquid two-phase hydrodynamic slug flow in horizontal and micro-inclined pipes |
| CN104897364B (en) * | 2015-06-16 | 2017-05-10 | 中国海洋石油总公司 | Method for determining gas-liquid two-phase hydrodynamic slug flow in horizontal and micro-inclined pipes |
| CN106932185A (en) * | 2017-03-15 | 2017-07-07 | 中国海洋石油总公司 | A kind of slug catcher sand deposition and separating property test system and method |
| CN106932185B (en) * | 2017-03-15 | 2019-05-28 | 中国海洋石油集团有限公司 | A kind of slug catcher sand deposition and separating property test macro and method |
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