CN102494952B - Drainage method for high-fall heavy-caliber oil-gas pipeline after pressure testing - Google Patents
Drainage method for high-fall heavy-caliber oil-gas pipeline after pressure testing Download PDFInfo
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- CN102494952B CN102494952B CN 201110393592 CN201110393592A CN102494952B CN 102494952 B CN102494952 B CN 102494952B CN 201110393592 CN201110393592 CN 201110393592 CN 201110393592 A CN201110393592 A CN 201110393592A CN 102494952 B CN102494952 B CN 102494952B
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- pressure
- water
- air compressor
- drainage
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Abstract
The invention relates to a drainage method for a heavy-caliber oil-gas pipeline used for paving in high-fall areas after pressure testing, which aims at solving the problem of pipeline burst caused by water attack in the drainage process of the oil-gas pipeline. The technical scheme is that the drainage method comprises the steps of firstly, selecting the model of an air compressor according to fall of a laid pipeline and the diameter of the pipeline; installing a pressure gauge and a high-pressure gate valve A connected with a drainage pipe on a pressure testing sealing head A at a drainage end of a main pipeline; enabling a pressure testing sealing head B at the other end of the main pipeline to be connected with a high-pressure gate valve B and then connected with the air compressor, wherein a pipe clearing device is arranged in the pressure testing sealing head B at this time; starting up the high-pressure gate valve A to carry out natural drainage, starting up high-pressure gate valve B when the pressure descends to early warning pressure, and starting up the air compressor to enable the pipe clearing device to clear away water; shutting down the high-pressure gate valve A when the pressure descends to the early warning pressure, stopping drainage, starting up the high-pressure gate valve A again when the pressure rises to safe drainage pressure, and continuing to clear away the water; and repeating the processes until finish. The drainage method can effectively prevent the pipeline burst, and is simple in structure and convenient in operation.
Description
Technical field:
The present invention relates to the high fall heavy-caliber oil-gas pressure testing water discharge method of a kind of large-caliber gas-oil pipeline be used to being layed in high drop area after the pressure testing test.
Background technology:
Along with increasing of domestic oil and gas pipes, the length of pipeline, caliber, displacement are also increasing, and execution conditions also become increasingly complex simultaneously.At present, be layed in the drainage procedure of oil and gas pipes after pressure testing in high drop area and the booster problem frequently occurs, have a strong impact on the process of pipeline laying, threaten working-yard workman and near resident's safety.It is rare sweeping the phenomenon that occurs booster in the water process after the pressure testing former, but the increase along with the geographical conditions complicacy of tubing, some areas of China even the physical features of ultrahigh fall occurs, the bore of pipeline increases day by day in addition, and the possibility that causes the booster phenomenon to occur sharply increases.Do not prevent from accordingly occuring in the drainage procedure after the pressure testing measure of booster in the existing pipeline pressure test draining embodiment, make it to become an operation blind spot in the high drop area pressure testing drainage construction.Therefore in the urgent need to a kind of for the water discharge method after the bigbore oil and gas pipes pressure testing of high drop.
Summary of the invention:
The objective of the invention is: in order to solve the difficult problem of the pipeline burst that causes owing to water attack after high drop, the bigbore oil and gas pipes pressure testing in drainage procedure, special proposition is a kind of for high fall heavy-caliber oil-gas pressure testing water discharge method.
In order to achieve the above object, the present invention is by the following technical solutions: a kind of high fall heavy-caliber oil-gas pressure testing water discharge method, it is characterized in that: according to the drop of tubing, the model that pipe diameter is selected air compressor, the pressure that air compressor is used and discharge capacity are greater than minimum rated pressure and the jot fixed displacement that calculates first; Next carries out the equipment installation, and setting pressure table on the pressure testing head A of Trunk Line discharge ends welds an arm and a high pressure sluice valve A is installed at pressure testing head A, fixes a drainpipe at high pressure sluice valve A endpiece; Branch pipe welded directly to the run pipe and installation high-voltage gate valve B on the other end pressure testing head B of Trunk Line connect air compressor with high pressure sluice valve B again, and this moment, rabbit was in the pressure testing head B; Equipment and instrument connect good after, open high pressure sluice valve A, the beginning natural drainage, the water in the Trunk Line is discharged from drainpipe by high pressure sluice valve A, observes and the force value of recording manometer; When force value is down to the early warning pressure P
1The time, opening high pressure gate valve B starts air compressor, and rabbit begins to sweep water, and pressurized air enters Trunk Line by high pressure sluice valve B, promotes rabbit and travels forward, and rabbit promotes water and advances, and hydraulic pressure raises, and makes manometric force value greater than the early warning pressure P
1Sweep in the process of water at rabbit, when manometric force value is down to the early warning pressure P again
1The time, close immediately high pressure sluice valve A, drainpipe stops draining, treats that manometric force value is elevated to safe discharge pressure P
2The time, open again high pressure sluice valve A, continue draining, so repeatedly until the end of whole drainage procedure.The rated pressure P of air compressor 〉=1.5 (P wherein
f+ P
W+ P
V-P
A)=1.5P
C,
In the formula: P
fExpression overcomes the required pressure of friction force between rabbit and the Trunk Line;
P
WBe the poor pressure and hydrostatic pressure that causes of maximum elevation in the pipeline;
P
VThe pressure for vaporization of expression water under the construction temperature condition;
P
ABe atmospheric pressure;
P
CThe minimum pressure that provides for air compressor is required.
By the required minimum pressure P that provides of air compressor
CLower, the rabbit speed of travel is that 0.1m/s calculates required air capacity Q, per minute institute air demand
D is the Trunk Line pipe diameter in the formula, and unit is m.
The early warning pressure P
1=ρ
WaterG Δ h+P
V+ P
m-P
A
In the formula: ρ
WaterThe density of expression water;
G represents acceleration of gravity;
Δ h is the difference of elevation of water delivering orifice and Trunk Line peak;
P
VThe pressure for vaporization of expression water under the construction temperature condition;
P
mFor the pressure allowance, get P
m=0.1MPa;
P
ABe atmospheric pressure.
Safe discharge pressure P
2=P
1+ P
m=P
1+ 0.1MPa.
The present invention has following beneficial effect: (1) can stop the booster problem in high drop, heavy caliber pressure testing drainage procedure effectively; (2) take full advantage of the existing equipment in working-yard, do not need extra equipment, reduce investment outlay; (3) simple in structure, principle is clear, and is easy to operate.
Inventive principle
According to Fig. 1, shown in Figure 2, drainage procedure comprises natural drainage and sweeps two stages of water, after opening high pressure sluice valve A7, the beginning natural drainage, overpressure descends gradually subsequently, when the force value of peak in the Trunk Line is down to pressure for vaporization under this water temperature, vaporization and cutout occur in water herein, if natural drainage is proceeded, then one section vacuum zone 10 can occur and along with the carrying out of natural drainage constantly increases, see Fig. 2 at peak.After opening air compressor 1, rabbit 4 promotes water and moves ahead, and vacuum zone 10 dwindles gradually, can produce pressure wave when the upstream and downstream free face of vacuum zone 10 bumps, and the safety of pipeline is had a negative impact.
Sweeping in the water process of rabbit 4, because discharge capacity and the pressure limitation of air compressor 1, also can vaporization occur at the peak of Trunk Line 9 cause cutout, if promoting water column, the after this high-pressure gas pressure of rabbit 4 upstreams rising moves ahead, when vacuum zone 10 disappears, can cause equally and make water attack up, if the water attack occurrence positions is nearer with outlet, then can be owing to the reflection of surge wave at pressure testing head A6 place causes instantaneous high pressure, when the water attack pressure spikes surpassed the explosion limit of Trunk Line 9 pipelines, the booster phenomenon will occur.For fear of the generation of booster phenomenon, the present invention provides the early warning pressure P of tensimeter 5
1, when the force value of tensimeter 5 is down to P
1The time, by closing high pressure sluice valve A, prevent from vaporizing at the peak of Trunk Line 9.Thereby effectively avoid the booster phenomenon.
Description of drawings:
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 is the structural representation of a kind of embodiment of the present invention.
Fig. 2 is the structural representation of the interior water generates vaporization of pipe cutout phenomenon in the drainage procedure.
Among the figure: 1, air compressor; 2, pressure testing head B; 3, high pressure sluice valve B; 4, rabbit; 5, tensimeter; 6, pressure testing head A; 7, high pressure sluice valve A; 8, drainpipe; 9, Trunk Line; 10, vacuum zone.
Embodiment:
According to shown in Figure 1, pipe installation is supposed the poor H of maximum elevation in the pipeline in high drop area
MaxBe 100m, outer diameter tube D is 1219mm, wall thickness 18.4mm, and the working-yard temperature is 20 ° of C.Before Trunk Line 9 carries out the pressure testing experiment, pressure testing head A6 in discharge ends installs a tensimeter 5, a branch pipe welded directly to the run pipe and high pressure sluice valve A7 is installed on pressure testing head A6 simultaneously, fix a drainpipe 8 at high pressure sluice valve A7 endpiece, again branch pipe welded directly to the run pipe and installation high-voltage gate valve B3 on the other end pressure testing head B2 of Trunk Line 9, before the draining, high pressure sluice valve A7 and high pressure sluice valve B3 are in closed condition after the pressure testing experiment finishes.
Select the air compressor 1 of suitable discharge capacity and rated discharge pressure, the rated pressure P of air compressor 1 is not less than 1.5 (P
f+ P
W+ P
V-P
A), P wherein
fFor overcoming the required pressure of friction force between rabbit 4 and the Trunk Line 9, measure P
fBe 0.3MPa, P
WFor the poor pressure and hydrostatic pressure that causes of maximum elevation in the Trunk Line 9, by P
W=ρ
WaterGH
MaxGet P
W=1000kPa, P
VBe the pressure for vaporization of water under 20 ° of C conditions of construction temperature, P
V=2.34kPa, P
ABe atmospheric pressure, be taken as 101.325kPa.By calculating P=1.8MPa, the rated pressure of selected air compressor should greater than calculating pressure, be the air compressor of 2MPa so select rated pressure; By the required minimum pressure P that provides of air compressor
CLower, the rabbit speed of travel is that 0.1m/s calculates required air capacity Q, per minute institute air demand
Wherein D is the Trunk Line diameter, substitution P value and internal diameter of the pipeline D
In, D
In=D-(2 * 18.4)=1182.2mm calculates Q=78.9m
3/ min is higher than 80m so choose rated discharge
3/ min gets final product, and also can with two air compressor parallel connections, reach 80m
3The discharge capacity of/min.The air compressor 1 of choosing is connected with high pressure sluice valve B3.
Before draining, calculate first early warning pressure and safe discharge pressure value.The early warning pressure P
1Determine according to following formula: P
1=ρ
WaterG Δ h+P
V+ P
m-P
A, ρ wherein
WaterBe the density of water, Δ h is the difference of elevation of water delivering orifice and Trunk Line 9 peaks, Δ h=70m, and g is acceleration of gravity, is taken as 10m/s
2, P
mFor the pressure allowance (is got P
mBe 0.1MPa), the substitution data calculate P
1=0.70MPa; Safe discharge pressure P
2Determine according to following formula: P
2=P
1+ P
m=0.80MPa.
High pressure sluice valve A7 is opened in the ready rear beginning natural drainage of equipment and instrument, the aperture of the control high pressure sluice valve A7 pressure in the Trunk Line 9 of slowly releasing, and the water in the Trunk Line 9 begin by high pressure sluice valve A7, from drainpipe 8 ejections.Observe the also pressure value P of recording manometer 5
g, along with the discharging of water, the pressure value P of tensimeter 5
gDescend gradually, when being reduced to the early warning pressure P
1During=0.70MPa, open air compressor 1, opening high pressure gate valve B3, the aperture of valve is standard-sized sheet.After air compressor 1 was opened, air entered Trunk Line 9 by high pressure sluice valve B3, promoted rabbit 4 and travelled forward, and water is compressed by rabbit 4, and the pressure in the Trunk Line 9 raises, the pressure value P of tensimeter 5
gWill be higher than the early warning pressure P
1Promote rabbit 4 at gases at high pressure and sweep in the water process, the reading of monitoring pressure table 5 is in pressure value P
gBe down to the early warning pressure P
1The time, then close rapidly high pressure sluice valve A7, stop draining, air compressor 1 continues to Trunk Line 9 interior injection air, treats pressure value P
gBe elevated to safe discharge pressure P
2During=0.80MPa, open again high pressure sluice valve A7, continue to sweep water, finish until sweep the water process.With this cycling, can effectively prevent the generation of booster phenomenon, be safety, economic, simple drainage pattern.
Claims (2)
1. one kind high fall heavy-caliber oil-gas pressure testing water discharge method, it is characterized in that: according to the drop of tubing, the model that pipe diameter is selected air compressor, the pressure that air compressor is used and discharge capacity are greater than minimum rated pressure and the jot fixed displacement of calculating first; Next carries out equipment and installs, pressure testing head A(6 in Trunk Line (9) discharge ends) upper setting pressure table (5), at pressure testing head A(6) upper branch pipe welded directly to the run pipe and a high pressure sluice valve A(7 is installed), at high pressure sluice valve A(7) endpiece fix a drainpipe (8); Again at the other end pressure testing head B(2 of Trunk Line (9)) upper branch pipe welded directly to the run pipe and installation high-voltage gate valve B(3), with air compressor (1) and high pressure sluice valve B(3) connect, rabbit (4) is placed pressure testing head B(2) in; Equipment and instrument connect good after, open high pressure sluice valve A(7), the beginning natural drainage, the water in the Trunk Line (9) is by high pressure sluice valve A(7) discharge from drainpipe (8), observe and the force value of recording manometer (5); When force value is down to the early warning pressure P
1The time, opening high pressure gate valve B(3), start air compressor (1), rabbit (4) begins to sweep water, the early warning pressure P
1=ρ
WaterG Δ h+P
V+ P
m-P
A, ρ in the formula
WaterThe density of expression water, g represents acceleration of gravity, Δ h is the difference of elevation of water delivering orifice and Trunk Line peak, P
VThe pressure for vaporization of expression water under the construction temperature condition, P
mFor the pressure allowance, get P
m=0.1MPa, P
ABe atmospheric pressure; Along with the promotion of rabbit (4), water is compressed, and the pressure in the Trunk Line (9) raises, and the force value of tensimeter (5) is greater than the early warning pressure P
1, water is constantly discharged; Sweeping in the water process of rabbit (4), when the force value of tensimeter (5) is down to the early warning pressure P
1The time, close immediately high pressure sluice valve A(7), drainpipe (8) stops draining, treats that the force value of tensimeter (5) is elevated to safe discharge pressure P
2The time, i.e. P
2=P
1+ P
m=P
1During+0.1MPa, open again high pressure sluice valve A(7), continue draining, so repeatedly until the end of whole drainage procedure.
2. oil and gas pipes pressure testing water discharge method according to claim 1 is characterized in that: the rated pressure P of above-mentioned air compressor 〉=1.5 (P
f+ P
W+ P
V-P
A)=1.5P
C, P in the formula
fExpression overcomes the required pressure of friction force between rabbit and the Trunk Line, P
WBe the poor pressure and hydrostatic pressure that causes of maximum elevation in the pipeline, P
VThe pressure for vaporization of expression water under the construction temperature condition, P
ABe atmospheric pressure, P
CThe minimum pressure that provides for air compressor is required; The rated discharge of above-mentioned air compressor
D is the Trunk Line pipe diameter in the formula, and unit is rice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110393592 CN102494952B (en) | 2011-12-02 | 2011-12-02 | Drainage method for high-fall heavy-caliber oil-gas pipeline after pressure testing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110393592 CN102494952B (en) | 2011-12-02 | 2011-12-02 | Drainage method for high-fall heavy-caliber oil-gas pipeline after pressure testing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102494952A CN102494952A (en) | 2012-06-13 |
| CN102494952B true CN102494952B (en) | 2013-04-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110393592 Expired - Fee Related CN102494952B (en) | 2011-12-02 | 2011-12-02 | Drainage method for high-fall heavy-caliber oil-gas pipeline after pressure testing |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103323333B (en) * | 2013-05-24 | 2015-08-19 | 西南石油大学 | A kind of high drop oil and gas pipes sweeps the method that water process prevents water attack |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100357721C (en) * | 2004-01-19 | 2007-12-26 | 徐州建筑职业技术学院 | Middle pressure test technology and device for large-diameter pipeline construction |
| CN101290075B (en) * | 2008-06-06 | 2010-06-09 | 陕西化建工程有限责任公司 | Long conveying pipeline construction method capable of simultaneously clearing pipe and testing pressure |
| CN102182930B (en) * | 2011-03-11 | 2012-05-30 | 温州建设集团有限公司 | Multi-system pipe network combined step-by-step hydraulic testing method |
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