CN102313138B - Online density measurement method of petroleum transmission pipeline - Google Patents
Online density measurement method of petroleum transmission pipeline Download PDFInfo
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- CN102313138B CN102313138B CN 201010227104 CN201010227104A CN102313138B CN 102313138 B CN102313138 B CN 102313138B CN 201010227104 CN201010227104 CN 201010227104 CN 201010227104 A CN201010227104 A CN 201010227104A CN 102313138 B CN102313138 B CN 102313138B
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Abstract
The invention discloses an online density measurement method and device of a petroleum transmission pipeline. The online density measurement device is characterized in that one section of process main pipeline (6) with a constant-temperature electric tracing and insulating function (17) is serially connected to a bypass pipeline arranged on a pipeline to be measured, and the inlet end and the outlet end of the process main pipeline (6) are respectively controlled by process valves. Starting from the process valve (13) at the inlet end of the process main pipeline (6), oil flowing through the process main pipeline (6) is sequentially subjected to the following flows of: 1, filtering and draining; 2, measuring of pressure difference of two filtering ends; 3, flow testing; 4, manual sampling; 5, online checking; 6, pressure detecting; 7, draining; 8, sampling of a sampling pump (3); 9, online checking; 10, heat expansion safety protecting; 11, online density detecting; 12; exhausting; 13, processing of an intelligent pressure transformer; and 14, pressure difference measuring, flow detecting, sampling, online density detecting, and sending of signals to an apparatus junction box (16)and then an SCADA (Supervisory Control And Data Acquisition) system by the intelligent pressure transformer.
Description
Technical field
The present invention is a kind of oil pipeline online density measuring method.The detection and the piping system technical field that relate to quality.
Background technology
For the oil pipeline online density measuring, process was just drawn bypass at the oil transportation trunk line, and in bypass sampling pump and densitometer are set in the past, bypass was incorporated into the mode of trunk line again.
The shortcoming of this kind density measure mode is: 1, the method is not carried out the online compensation of temperature and pressure to density measure, has affected the degree of accuracy of densitometry; 2, because the pipeline medium cleanliness are not high, and the impurity that the inside is contained and iron filings often stop up sampling pump, cause the fault damage of sampling pump, so constantly detection that just can't be implemented in line density; 3, adopt bypass sampling and measuring density mode, produce easily thermal expansion of pipeline and superpressure, thereby damage bypass measuring channel and measuring equipment; 4, can't realize the densitometer in-line calibration; 5, because the bypass measuring method directly is connected with the technique trunk line, cause easily the loss of the cathodic protection current of pipeline, and cathodic protection current impacts to operation and the degree of accuracy of density measure easily also; 6, do not have instrument system supervision, can't be implemented in the SCADA system to detection and the control of measuring circuit; 7, do not have drainage, can't realize the maintenance to equipment; 8, heat is not mixed in insulation, can't realize the outdoor layout of measuring circuit.
Summary of the invention
The objective of the invention is to invent a kind of continuity, degree of accuracy and stability when making the oil pipeline online density measuring more be tending towards standardization, modularization, raising online density measuring, make things convenient for operation maintenance, calibrating and realize the oil pipeline online density measuring method of monitoring and control in the SCADA system.
This oil pipeline online density measuring method is: as shown in Figure 1, at tested pipeline bypass duct is set, one section test of serial connection has the constant temperature electrical heating and is incubated 17 technique Trunk Line 6 on the bypass duct, the outlet termination technique valve (11) 28 of technique Trunk Line 6, outermost end acting flange (1) 1, import termination technique valve 13, outermost termination insulating flange (2) 35, technique Trunk Line 6 is serially connected in the tested pipeline by flange (1) 1 and flange (2) 35; Setting gradually filtrator (1) 2 both sides from the technique valve 13 beginning technique Trunk Lines 6 of technique Trunk Line 6 entrance points respectively is connected in series technique valve (2) 19 and technique valve (4) 21 and respectively is connected in series technique valve (3) 20 and technique valve (5) 22 also filtrators (1) 2 in parallel and filtrator (2) 38 front and back with filtrator (2) 38 both sides differential pressure transmitter 10 is set, flow switch 11, serial connection technique valve (6) 23, the moving sample valve 14 of other catcher, the side is connected on the technique valve (12) 29 of line calibrating mouth (1) 8, the side connects on the spot tensimeter 12, the technique valve (16) 33 of dirty pipeline 7 runs on the side, sampling pump 3, serial connection technique valve (7) 24, the side is connected on the technique valve (13) 30 of line calibrating mouth (2) 37, the thermal expansion safety valve 5 of dirty pipeline 7 runs on the side, technique valve (10) 27, technique valve (8) 25 and on-line densimeter 4, connect again technique valve (10) 27 other ends after (9) 26 series connection of technique valve, air valve 15 runs on the side, the technique valve (17) 34 of dirty pipeline 7 runs on the side, intelligent pressure transmitter 9; Instrument junction box 16 is connected with the SCADA system.
The flow process of carrying out oil pipeline online density measuring method with said apparatus is successively:
1) filtration and blowdown;
2) differential pressure measurement at filtration two ends;
3) flow rate test;
4) manually sampling;
5) in-line calibration;
6) pressure detection;
7) blowdown;
8) sampling pump 3 samplings;
9) in-line calibration;
10) thermal expansion safeguard protection;
11) online Density Detection;
12) exhaust;
13) intelligent pressure transmitter;
14) differential pressure measurement, flow detection, sampling, online Density Detection, intelligent pressure transmitter respectively send instrument junction box 16 with signal, and instrument junction box 16 send the SCADA system again.
For technique Trunk Line 6 does not affect the cathodic protection of tested pipeline, in the import and export outer end of technique Trunk Line 6 insulating flange is installed respectively, insulate with tested pipeline.
Wherein:
1) mode of two magnetic filters (1) 2, magnetic filter (2) 38 parallel connections is adopted in filtration and blowdown, and the foreign material that filter out are drained through blowdown pipeline 7;
2) differential pressure measurement at filtration two ends is to send the SCADA system to process pressure difference signal with intelligent differential pressure transmitter 10;
3) flow detection adopts flow switch 11 to send the SCADA system to process flow signal;
4) manually sampling is realized by manual sample valve 14;
5) and 9) in-line calibration be to realize by in-line calibration mouth (1) 8, in-line calibration mouth (2) 37 is set;
6) pressure detection is by on the spot tensimeter 12 realizations;
7) blowdown is behind the tensimeter on the spot 12, after the thermal expansion safety and after the exhaust, and blowdown pipeline 7 blowdowns are respectively arranged;
8) sampling pump 3 provides sampling for on-line densimeter 4;
10) thermal expansion safeguard protection technique Trunk Line 6 superpressure not;
11) the online tested pipeline of Density Detection at line density;
12) exhaust realizes by vent valve 15 is installed, by manual control;
13) intelligent pressure becomes that to send be to be realized by intelligent pressure transmitter 9, and on-line densimeter 4 is implemented in the linear pressure compensation;
14) differential pressure measurement 10, flow detection 11, sampling 3, online Density Detection 4, intelligent pressure transmitter 9 respectively send instrument junction box 16 with signal, and instrument junction box 16 send the SCADA system again.
Described technique valve (8) 25 is with to connect technique valve (10) 27 other ends after on-line densimeter 4, technique valve (9) 26 are connected are two technique valves (8) 25, technique valve (9) 26 outer ends of 26 1 sections on technique valve (8) 25, on-line densimeter 4, technique valve (9) in series connection again and connect a technique valve (10) 27;
Described sampling pump 3 has instrument cable (4) 42 to meet instrument junction box 16; Intelligent pressure transmitter 9 has instrument cable (5) 43 to meet instrument junction box 16; On-line densimeter 4, flow switch 11, intelligent differential pressure transmitter 10 respectively have instrument cable (3) 41, instrument cable (2) 40, instrument cable (1) 18 to meet instrument junction box 16;
Described magnetic filter (1) 2 is by technique valve (14) the 31 dirty pipeline 7 that runs in, and magnetic filter (2) 38 is by technique valve (15) the 32 dirty pipeline 7 that runs in; Blowdown pipeline 7 has the constant temperature electrical heating and is incubated 39, the outer termination flange (3) 36 of blowdown pipeline 7;
Described in-line calibration mouth (1) 8 and in-line calibration mouth (2) 37 are flange port;
Wherein:
Flange (1) 1, flange (2) 35 adopt insulating flange; The flange (3) 36 of the outer end of blowdown pipeline 7 also adopts insulating flange;
On-line densimeter 4, thermal expansion safety valve 5, intelligent pressure transmitter 9, intelligent differential pressure transmitter 10, flow switch 11, on the spot tensimeter 12, a plurality of technique valve, manually sample valve 14, vent valve 15 are all selected city's pin product.
The present invention arranges on the spot tensimeter 12 and manually sample valve 14 in sampling pump 3 fronts, on the sampling pump 3 outlet technique Trunk Lines 6 thermal expansion safety valve 5 is set, and on the densitometer 4 outlet technique Trunk Lines 6 vent valve 15 is set; Import technique Trunk Line 6 and the thermal expansion safety valve 5 of filtrator (1) 2, filtrator (2) 38 and sampling pump 3 connect blowdown pipeline 7 simultaneously; The instrument cable (1) 18 that the SCADA system connects by instrument junction box 16, instrument cable (2) 40, instrument cable (5) 43, instrument cable (3) 41, instrument cable (4) 42 are realized the detection of differential pressure transmitter 10, flow switch 11, pressure unit 9, on-line densimeter 4 and sampling pump 3 opened, stop control; The import and export of densitometer 3 arrange in-line calibration mouth (1) 8 and in-line calibration mouth (2) 37.
Adopt the method for online density measuring can realize that oil pipeline detects constantly at line density, have the accuracy height, stable, be convenient to that the SCADA system remote detects and control, be beneficial to many-sided advantages such as Maintenance and Repair in the future, and sledge installing is in the open put, and has saved between occupation of land space and operation.Make pipe-line construction more be tending towards standardization, modularization, hommization, minimizing working procedure, make things convenient for operation maintenance, reduce equipment investment and executive cost.
Can realize the on-line measurement of density after the method for the present invention for oil pipeline employing online density measuring, and reach accuracy and the stable requirement that improves density measure, guarantee the constantly continuity of density measure.The open-air design of device sledge dress in the method, its degree of protection is IP65, explosive-proof grade EXdIIBT4 satisfies open-air atmosphere and on-the-spot anti-riot requirement fully; Adopt the standard insulating flange to be connected between device in the method and the process pipe, and be applicable to the operating mode of high pressure, the loss of process pipe cathodic protection current has been avoided in the setting of while insulating flange, also guarantees accuracy and the stability of density measure; The sampling pump of sample preparation and conveying adopts efficient magnetic couple centrifugal pump, without leaking and the shaft seal maintenance problem; Before the porch sampling pump of device, be provided with redundant filtrator, guaranteed stability and the reliability of the continuous operation of sampling pump; Metal screen in filtrator is provided with the magnetic absorption device, can well adsorb metallic residue and particle in institute's pumped (conveying) medium, has guaranteed the stable operation of filtrator and sampling pump and has prolonged its serviceable life; Import and export at device are provided with respectively the in-line calibration mouth, can be implemented in the line density calibrating, have improved the stability of density measuring equipment operation; External medium cleaning way is adopted in the cleaning of densitometer table, and is with low cost and clean again.In device, be provided with a pressure unit and carry out online pressure compensation, utilize the measured temperature of densitometer to carry out online temperature compensation, improved the Stability and veracity of online density measuring; In density measuring equipment, be furnished with relevant emptying, blowdown pipeline and valve, can carry out blowdown, shutoff and emission treatment to pipeline and the equipment in installing, be convenient to daily maintenance and maintenance; Be provided with the hot high pressure expansion relief valve in device, when the pipeline superpressure in the device reached the value of releasing of safety valve, safety valve action was implemented safeguard protection to the pipeline in installing; Install pipeline in the device constant temperature electrical heating and Insulation, guarantee online density measuring device outdoor layout and working in the winter time, satisfy calibrating to the requirement of environment temperature.
Process pipe between sampling pump and filtrator arranges flow switch, is used for the SCADA system to the operation of sampling pump and the detection of malfunction; The SCADA system can open, stop controlling sampling pump by the instrument junction box in installing is long-range, and carries out temperature, the pressure compensation calculating of online density, can be presented at line density value and mark condition density value in the SCADA system simultaneously; Differential pressure transmitter is set before and after filtrator is used for the running status that the SCADA system remote detects filtrator, judge whether filtrator stops up.
Adopt the online density measuring method can realize that oil pipeline detects constantly at line density, have the accuracy height, stable, be convenient to that the SCADA system remote detects and control, be beneficial to many-sided advantages such as Maintenance and Repair in the future, and sledge installing is in the open put, and has saved between occupation of land space and operation.Make pipe-line construction more be tending towards standardization, modularization, hommization, minimizing working procedure, make things convenient for operation maintenance, reduce equipment investment and executive cost.
The present invention is applicable to oil pipeline online density measuring mode.Oil pipeline online density measuring for long-distance transport pipes engineering, oil-gas field surface engineering, oil depot engineering has huge application space and good economic benefit.
Description of drawings
Fig. 1 oil pipeline online density measuring device process flow diagram
1-flange (1) 2-magnetic filter (1) wherein
3-sampling pump 4-on-line densimeter
5-thermal expansion safety valve 6-technique Trunk Line
7-blowdown pipeline 8-in-line calibration mouth (1)
9-intelligent pressure transmitter 10-intelligent differential pressure transmitter
11-flow switch 12-is tensimeter on the spot
The manual sample valve of 13-technique valve (1) 14-
15-vent valve 16-instrument junction box
17-constant temperature electrical heating and insulation 18-instrument cable (1)
19-technique valve (2) 20-technique valve (3)
21-technique valve (4) 22-technique valve (5)
23-technique valve (6) 24-technique valve (7)
25-technique valve (8) 26-technique valve (9)
27-technique valve (10) 28-technique valve (11)
29-technique valve (12) 30-technique valve (13)
31-technique valve (14) 32-technique valve (15)
33-technique valve (16) 34-technique valve (17)
35-flange (2) 36-flange (3)
37-in-line calibration mouth 38-magnetic filter (2)
39-constant temperature electrical heating and insulation 40-instrument cable (2)
41-instrument cable (3) 42-instrument cable (4)
43-instrument cable (5)
Embodiment
Embodiment. this example be in Lanzhou-Zhengzhou-online density measuring method and device that Changsha products pipeline engineering test is used.This oil pipeline online density measuring method is: as shown in Figure 1, at tested pipeline bypass duct is set, one section test of serial connection has the constant temperature electrical heating and is incubated 17 technique Trunk Line 6 on the bypass duct, the outlet termination technique valve (11) 28 of technique Trunk Line 6, outermost end acting flange (1) 1, import termination technique valve 13, outermost termination insulating flange (2) 35, technique Trunk Line 6 is serially connected in the tested pipeline by flange (1) 1 and flange (2) 35; Setting gradually filtrator (1) 2 both sides from the technique valve 13 beginning technique Trunk Lines 6 of technique Trunk Line 6 entrance points respectively is connected in series technique valve (2) 19 and technique valve (4) 21 and respectively is connected in series technique valve (3) 20 and technique valve (5) 22 also filtrators (1) 2 in parallel and filtrator (2) 38 front and back with filtrator (2) 38 both sides differential pressure transmitter 10 is set, flow switch 11, serial connection technique valve (6) 23, the moving sample valve 14 of other catcher, the side is connected on the technique valve (12) 29 of line calibrating mouth (1) 8, the side connects on the spot tensimeter 12, the technique valve (16) 33 of dirty pipeline 7 runs on the side, sampling pump 3, serial connection technique valve (7) 24, the side is connected on the technique valve (13) 30 of line calibrating mouth (2) 37, the thermal expansion safety valve 5 of dirty pipeline 7 runs on the side, technique valve (10) 27, technique valve (8) 25 and on-line densimeter 4, connect again technique valve (10) 27 other ends after (9) 26 series connection of technique valve, air valve 15 runs on the side, the technique valve (17) 34 of dirty pipeline 7 runs on the side, intelligent pressure transmitter 9; Instrument junction box 16 is connected with the SCADA system.
The flow process of carrying out oil pipeline online density measuring method with said apparatus is successively:
1) filtration and blowdown;
2) differential pressure measurement at filtration two ends;
3) flow rate test;
4) manually sampling;
5) in-line calibration;
6) pressure detection;
7) blowdown;
8) sampling pump 3 samplings;
9) in-line calibration;
10) thermal expansion safeguard protection;
11) online Density Detection;
12) exhaust;
13) intelligent pressure transmitter;
14) differential pressure measurement, flow detection, sampling, online Density Detection, intelligent pressure transmitter respectively send instrument junction box 16 with signal, and instrument junction box 16 send the SCADA system again.
For technique Trunk Line 6 does not affect the cathodic protection of tested pipeline, in the import and export outer end of technique Trunk Line 6 insulating flange is installed respectively, insulate with tested pipeline.
Described sampling pump 3 has instrument cable (4) 42 to meet instrument junction box 16; Intelligent pressure transmitter 9 has instrument cable (5) 43 to meet instrument junction box 16; On-line densimeter 4, flow switch 11, intelligent differential pressure transmitter 10 respectively have instrument cable (3) 41, instrument cable (2) 40, instrument cable (1) 18 to meet instrument junction box 16;
Described magnetic filter (1) 2 is by technique valve (14) the 31 dirty pipeline 7 that runs in, and magnetic filter (2) 38 is by technique valve (15) (15) the 32 dirty pipeline 7 that runs in; Blowdown pipeline 7 has the constant temperature electrical heating and is incubated 39, the outer termination flange (3) 36 of blowdown pipeline 7;
Described in-line calibration mouth (1) 8 and in-line calibration mouth (2) 37 are flange port;
Wherein:
Filtrator (1) 2 and filtrator (2) 38 redundant settings are provided with the magnetic absorption device on the metal screen in filtrator (1) 2 and the filtrator (2) 38;
The 7835A-A-A-B-A-K-T-A-A-A model that on-line densimeter 4 selects EMERSON Britain to produce, pressure rating is Class 900;
Intelligent differential pressure transmitter 10 selects Taiwan Golden Mountain to produce
200-DPG-G-S-4.0-ZZ-1-SS-T-B-3-1.6KG/CM2-0；
The BF300-GS-3015-C1-B-B-T-10F-Ex-0 that flow switch 11 selects Taiwan Golden Mountain to produce, 1 " ANSI 900, Micro Switch;
Electric tracing and temperature detect switch (TDS) that constant temperature electrical heating and insulation (1) 17 and constant temperature electrical heating and insulation (2) 39 select Britain HEAT TRACE to produce, HTL50FSPR;
A plurality of technique valves select that Taiwan Golden Mountain produces 1 " ANSI 900RF, CFM8;
Manually sample valve 14 is selected PR1/1/4 " NPT, the 316SS that German G0 company produces;
1/2 " NPT, the 6000PSI valve that vent valve 15 selects Taiwan Modentic to produce.
The pressure rating of all process pipeline and equipment satisfies Class 900 requirements; And the sledge that is integrated in 2840mm (wide) 1500mm (deeply) 2300mm (height) is loaded onto.
Need do relevant anticorrosion, antirust processing after the production and processing of whole density measuring equipment sledge dress is complete, all process pipeline and equipment do the constant temperature electrical heating and insulation is processed.
This example is through on probation, accuracy and the stability of online density measuring have been improved, realized the constantly continuity of density measure, be convenient to detection and the control of Remote SCADA system, be beneficial to many-sided advantages such as in the future maintenance, maintenance, calibrating, and can realize that the installing of open-air sledge puts, save between occupation of land space and operation.Make pipe-line construction more be tending towards standardization, modularization, hommization, minimizing working procedure, make things convenient for operation maintenance, reduce equipment investment and executive cost.
Claims (6)
1. oil pipeline online density measuring method, it is characterized in that at tested pipeline bypass duct being set, the technique Trunk Line (6) that the second constant temperature electrical heating and insulation (17) are arranged of one section test of serial connection on the bypass duct, outlet termination the 11 technique valve (28) of technique Trunk Line (6), outermost termination first method blue (1), import termination the first technique valve (13), outermost termination the second flange (35), technique Trunk Line (6) is serially connected in the tested pipeline by the first flange (1) and the second flange (35); From the first technique valve (13) of technique Trunk Line (6) entrance point, the first magnetic filter (2) and the second magnetic filter (38) in parallel are set first on the technique Trunk Line (6), and the first magnetic filter (2) both sides respectively are connected in series the second technique valve (19) and the 4th technique valve (21), the second magnetic filter (38) both sides respectively are connected in series the 3rd technique valve (20) and the 5th technique valve (22), and before and after the first magnetic filter (2) and the second magnetic filter (38) intelligent differential pressure transmitter (10) and flow switch (11) are set; Wherein the first magnetic filter (2) is by the 14 technique valve (31) the dirty pipeline (7) that runs in, and the second magnetic filter (38) is by the 15 technique valve (32) the dirty pipeline (7) that runs in; Blowdown pipeline (7) is connected with the first constant temperature electrical heating and insulation (39), the outer termination three-flange (36) of blowdown pipeline (7); After this be connected in series successively the 6th technique valve (23), sampling pump (3), at the 6th technique valve (23), the moving sample valve (14) of other catcher between the sampling pump (3), the 12 technique valve (29) of the first in-line calibration mouth (8), tensimeter (12) on the spot, the 16 technique valve (33) of blowdown pipeline (7), be connected in series successively the 7th technique valve (24) behind the sampling pump (3), the 8th technique valve (25), on-line densimeter (4), the 9th technique valve (26), the 9th technique valve (26) is received the 11 technique valve (28) by the second constant temperature electrical heating and insulation (17); Other the 13 technique valve (30), the thermal expansion safety valve (5) of blowdown pipeline (7), the tenth technique valve (27) that connects the second in-line calibration mouth (37) successively between the 7th technique valve (24) and the 8th technique valve (25), wherein behind another termination the 9th technique valve (26) of the tenth technique valve (27), successively other run in air valve (15), the 17 technique valve (34) of blowdown pipeline (7), intelligent pressure transmitter (9) between the 9th technique valve (26) and described the second constant temperature electrical heating and the insulation (17); Instrument junction box (16) is connected with the SCADA system;
The flow process of carrying out oil pipeline online density measuring method with said apparatus is successively:
1) filtration and blowdown;
2) differential pressure measurement at filtration two ends;
3) flow rate test;
4) manually sampling;
5) in-line calibration;
6) pressure detection;
7) blowdown;
8) sampling pump (3) sampling;
9) in-line calibration;
10) thermal expansion safeguard protection;
11) online Density Detection;
12) exhaust;
13) intelligent pressure transmitter;
14) differential pressure measurement, flow detection, sampling, online Density Detection, intelligent pressure transmitter respectively send described instrument junction box (16) with signal, and described instrument junction box (16) send the SCADA system again.
2. oil pipeline online density measuring method according to claim 1 is characterized in that described the first flange (1) and second flange (35) of the import and export outer end installation of technique Trunk Line (6) is insulating flange, insulate with tested pipeline.
3. oil pipeline online density measuring method according to claim 1, the differential pressure measurement that it is characterized in that described filtration two ends are to send the SCADA system to process pressure difference signal with described intelligent differential pressure transmitter (10).
4. oil pipeline online density measuring method according to claim 1 is characterized in that described flow detection adopts described flow switch (11) to send the SCADA system to process flow signal.
5. oil pipeline online density measuring method according to claim 1 is characterized in that described blowdown is behind described on the spot tensimeter (12), after the thermal expansion safety and after the exhaust, respectively has described blowdown pipeline (7) blowdown.
6. oil pipeline online density measuring method according to claim 1 is characterized in that it is to be realized by described intelligent pressure transmitter (9) that described intelligent pressure change is sent, and is implemented in the linear pressure compensation to described on-line densimeter (4).
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| CN 201010227104 CN102313138B (en) | 2010-07-06 | 2010-07-06 | Online density measurement method of petroleum transmission pipeline |
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| CN 201010227104 CN102313138B (en) | 2010-07-06 | 2010-07-06 | Online density measurement method of petroleum transmission pipeline |
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| CN102313138B true CN102313138B (en) | 2013-05-01 |
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| CN109386738B (en) * | 2018-12-18 | 2023-11-14 | 中国石油天然气集团有限公司 | Pipe explosion monitoring alarm and interlocking protection device for valve chamber main pipeline of gas pipeline |
| CN113483946B (en) * | 2021-06-01 | 2023-04-28 | 广西防城港核电有限公司 | Water filling and exhausting system and method for differential pressure transmitter |
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| CN102313138A (en) | 2012-01-11 |
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