CN114722325B - Calculation method for critical accumulated liquid volume of ground fluctuation pipe section - Google Patents
Calculation method for critical accumulated liquid volume of ground fluctuation pipe section Download PDFInfo
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- CN114722325B CN114722325B CN202210286370.0A CN202210286370A CN114722325B CN 114722325 B CN114722325 B CN 114722325B CN 202210286370 A CN202210286370 A CN 202210286370A CN 114722325 B CN114722325 B CN 114722325B
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- 239000007788 liquid Substances 0.000 title claims abstract description 41
- 238000004364 calculation method Methods 0.000 title claims abstract description 17
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 65
- 239000003345 natural gas Substances 0.000 claims abstract description 32
- 238000009825 accumulation Methods 0.000 claims abstract description 27
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000012876 topography Methods 0.000 claims abstract description 7
- 239000007789 gas Substances 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 16
- 238000012937 correction Methods 0.000 claims description 7
- 239000012530 fluid Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 abstract description 6
- 238000013524 data verification Methods 0.000 abstract description 2
- 230000005540 biological transmission Effects 0.000 description 3
- 206010030113 Oedema Diseases 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
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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
- F17D5/005—Protection or supervision of installations of gas pipelines, e.g. alarm
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Abstract
The invention relates to the technical field of natural gas pipeline effusion, in particular to a calculation method suitable for critical effusion of a ground fluctuation pipe section. According to the topography of the gathering and transportation pipeline along the line, calculating the critical accumulated liquid corresponding to the average dip angle of the fluctuating pipeline section, and correcting. The method considers the influence of different factors of the ground gathering and conveying pipeline on the critical liquid accumulation of the pipeline, fully considers the multi-fluctuation characteristic of the ground gathering and conveying pipeline, determines the calculation method of the critical liquid accumulation under different fluctuation conditions, has wide application range, has better accuracy through field data verification, and can provide theoretical basis for the prediction of the liquid accumulation of the gathering and conveying pipeline under the multi-fluctuation topography condition and the determination of the pipe cleaning period.
Description
Technical Field
The invention relates to the technical field of natural gas pipeline effusion, in particular to a calculation method suitable for critical effusion of a ground fluctuation pipe section.
Background
The wet gas conveying pipeline is extremely easy to cause the problem of pipeline effusion under the condition of multi-rising topography, and pipeline cleaning measures are indispensable. The current determination method of the pipe cleaning period mainly comprises a minimum gas transmission efficiency method, a maximum allowable pressure drop method and a maximum liquid accumulation method. The maximum liquid accumulation method is currently applied more, and mainly comprises the steps of comparing and judging the maximum liquid accumulation of a pipeline with the liquid treatment capacity of a pipeline terminal slug flow catcher or a separator by calculating the maximum liquid accumulation of the pipeline, so as to determine a proper pipe cleaning period.
During the operation of the wet gas pipeline, the accumulated liquid starts to accumulate from the inlet and gradually advances to the downstream, the liquid accumulation in the pipe gradually increases, and after a period of operation, the liquid accumulation in the pipe does not change significantly and reaches the maximum value, and the liquid accumulation at the moment is the critical liquid accumulation. The critical fluid accumulation of the pipeline is influenced by a plurality of factors, including gas transmission capacity, operating pressure, inlet temperature, inner diameter of the pipeline, length of the pipeline, water content and the like. At present, less researches are carried out on the aspect, and regular analysis and relational expression fitting are mainly carried out on the relation between the gas transmission quantity of the pipeline and the critical accumulated liquid quantity. The calculation of critical liquid accumulation of the fluctuating pipe section under the multi-factor condition can be carried out, a basic basis can be provided for the determination of the pipe cleaning period of the wet gas pipeline, and the method has very important significance for preventing the liquid accumulation of the pipeline and maintaining the safe and stable operation of the pipeline.
Disclosure of Invention
The invention aims to solve the problems and provides a method for calculating critical dropsy of a ground fluctuation pipe section.
The technical scheme of the invention is as follows:
According to the topography of the gathering and transportation pipeline along the line, calculating the critical accumulated liquid corresponding to the average dip angle of the fluctuating pipeline section, and correcting; the calculation process for calculating the critical accumulated liquid amount corresponding to the average inclination angle of the undulating pipe section comprises the following steps:
Wherein: q AL is the critical accumulated liquid amount corresponding to the average dip angle of the undulating pipe section, m 3;
d is the pipe diameter of the gathering and transportation pipeline, and m;
p is the terminal entering pressure of the gathering and transportation pipeline and MPa;
w is the molar water content of the wet natural gas conveyed by the collecting and conveying pipeline, and is dimensionless;
m is the mass flow of natural gas, kg/s;
l is the total length of the undulating pipe section, km;
θ ave is the average inclination angle and radian of the undulating pipe section;
The correction process comprises the following steps:
Wherein: q XL is the critical liquid accumulation amount correction value, m 3;
n is the total number of times the undulating pipe section is tilted up, and times.
Wherein,
The natural gas mass flow m is calculated by the following steps:
Wherein: ρ g is the gas phase density in wet natural gas, kg/m 3;Vg is the natural gas volumetric flow under standard conditions, m 3/s;
M is natural gas molar mass, kg/M 3; v is the natural gas volumetric flow, m 3/s;
R is a gas constant, and the value is 8.314 KJ/(mol.K); t is the temperature of natural gas, K;
t is the temperature of natural gas and the temperature is lower than the temperature;
M i is the molar mass of each component in the natural gas, kg/M 3;xi is the molar content of each component in the natural gas.
Wherein,
The calculation process of the molar water content w of the wet natural gas conveyed by the collecting and conveying pipeline comprises the following steps:
Wherein,
Wherein: n gas is the molar content of natural gas produced by a gas well, and is dimensionless; n water is the molar content of produced water of the gas well, and is dimensionless;
m h20 is the mass flow rate of produced water of the gas well, kg/s; m h20 is the molar mass of water, kg/mol;
V m is the molar volume of natural gas produced by the gas well, m 3/mol.
Wherein,
The calculation process of the average dip angle theta ave of the undulating pipe section comprises the following steps:
wherein: h i is the corresponding undulating elevation of the ith undulating pipe section, m;
And l i is the pipeline length corresponding to the i-th section of undulating pipe section, and m.
Wherein,
The calculation process of the total length L of the undulating pipe section is as follows:
The invention has the technical effects that:
The method considers the influence of different factors of the ground gathering and conveying pipeline on the critical liquid accumulation of the pipeline, fully considers the multi-fluctuation characteristic of the ground gathering and conveying pipeline, determines the calculation method of the critical liquid accumulation under different fluctuation conditions, has wide application range, has better accuracy through field data verification, and can provide theoretical basis for the prediction of the liquid accumulation of the gathering and conveying pipeline under the multi-fluctuation topography condition and the determination of the pipe cleaning period.
Drawings
FIG. 1 is a schematic diagram of a process for calculating the critical fluid accumulation of a section of a ground surface relief pipe.
FIG. 2 is a longitudinal section of a gathering conduit taken along the line.
Detailed Description
A method for calculating critical effusion of a ground fluctuation pipe section takes a well region gathering and transportation pipeline of a Yanan gas field as an example, and comprises the following steps:
Step 1: the data of the natural gas composition of the well region are shown in Table 1, the entering pressure at the tail end of the gathering and conveying pipeline is 5.6MPa, the temperature t20 ℃ of the natural gas is calculated to be 34.47kg/m 3 under the natural gas operation condition (gas phase density rho g), the water content of the natural gas is 0.6m 3/square, the equivalent molar water content w is 7.27%, and the density of the produced liquid is 900kg/m 3.
TABLE 1 Natural gas Components
| CH4 | C2H6 | C3H8 | i-C4H10 | n-C4H10 | i-C5H12 | n-C5H12 | Heavy hydrocarbons | CO2 | H2S | He | N2 |
| 92.878 | 0.618 | 0.066 | 0.004 | 0.004 | 0.001 | 0.001 | 0.001 | 3.803 | 0.148 | 0.048 | 2.428 |
Step 2: collecting the pipe diameter, the wall thickness and the pipeline longitudinal section data of the gathering and transportation pipeline, wherein the longitudinal section view of the gathering and transportation pipeline along the pipeline is shown in fig. 2, and determining the following basic design parameters:
(1) The pipe diameter D of the collecting and conveying pipeline is 80mm;
(2) And calculating corresponding dip angles according to the corresponding undulating heights and pipeline lengths of each undulating pipe section, and determining the average dip angle theta ave of the undulating pipe section to be 8.77 degrees according to a formula (8).
Step 3: calculating according to the formula (1) to obtain the critical liquid accumulation amount corresponding to the average inclination angle of the fluctuating pipe section as 14.51m 3; and (3) obtaining the critical accumulated liquid volume correction value of the fluctuating pipe section to be 14.22m 3 through a formula (2) according to the fluctuating frequency of 15 times.
Step 3: calculating according to the formula (1) to obtain the critical liquid accumulation amount corresponding to the average inclination angle of the fluctuating pipe section as 14.51m 3; and (3) obtaining the critical accumulated liquid volume correction value of the fluctuating pipe section to be 14.22m 3 through a formula (2) according to the fluctuating frequency of 15 times.
Taking 7 gathering and transportation pipelines of a certain well region of a Yanan gas field as an example, counting basic data such as the terminal entering pressure P of each gathering and transportation pipeline, the mass flow rate m of natural gas, the molar water content w, the pipe diameter D, the total length L of the undulating pipe section, the total upward-tilting times n of the undulating pipe section, the average inclination angle theta ave of the undulating pipe section, the corresponding critical accumulated liquid quantity Q AL, the critical accumulated liquid quantity correction value Q XL and the like, and comparing the results with the table 2;
TABLE 2 comparison of calculation results of critical fluid volumes for different pipelines
Through the comparative analysis of the data, the calculated value of the model is higher in the degree of coincidence with the actual condition of field operation, the error is controlled to be more than 90%, and the critical liquid accumulation amount calculated by the model has reasonability, so that the safety production of a surface gathering and transportation system of a gas field can be guided.
Claims (5)
1. A calculation method of critical accumulated liquid volume of a ground fluctuation pipe section is characterized by comprising the following steps: according to the topography along the collecting and conveying pipeline, calculating the fluctuation dip angle distribution of the topography along the collecting and conveying pipeline, calculating the critical accumulated liquid quantity corresponding to the average dip angle of the fluctuation pipe section, and correcting; the calculation process for calculating the critical accumulated liquid amount corresponding to the average inclination angle of the undulating pipe section comprises the following steps:
Wherein: q AL is the critical accumulated liquid amount corresponding to the average dip angle of the undulating pipe section, and the unit is m 3;
d is the pipe diameter of a gathering and conveying pipeline, and the unit is m;
P is the terminal entering pressure of the gathering and transportation pipeline, and the unit is MPa;
w is the molar water content of the wet natural gas conveyed by the collecting and conveying pipeline, and is dimensionless;
m is the mass flow of natural gas, and the unit is kg/s;
l is the total length of the undulating pipe section, and the unit is km;
θ ave is the average inclination angle of the undulating pipe section, and the unit is radian;
The correction process comprises the following steps:
wherein: q XL is a critical liquid accumulation amount correction value, and the unit is m 3;
n is the total number of times the undulating pipe section is tipped up in units of times.
2. The method for calculating the critical liquid accumulation amount of the ground heave pipe section according to claim 1, wherein: the natural gas mass flow m is calculated by the following steps:
Wherein: m is the molar mass of natural gas, and the unit is kg/mol;
V is the volume flow of natural gas, and the unit is m 3/s;
r is a gas constant, and the unit is KJ/(mol.K); the value is 8.314 KJ/(mol.K);
t is the natural gas temperature in degrees celsius.
3. The method for calculating the critical liquid accumulation amount of the ground heave pipe section according to claim 2, wherein: the calculation process of the molar water content w of the wet natural gas conveyed by the collecting and conveying pipeline comprises the following steps:
Wherein,
Wherein: n gas is the molar content of natural gas produced by a gas well, and is dimensionless;
N water is the molar content of produced water of the gas well, and is dimensionless;
m h20 is the mass flow rate of produced water of the gas well, and the unit is kg/s; m h20 is the molar mass of water in kg/mol;
V g is the natural gas volume flow under standard conditions, and the unit is m 3/s;
V m is the molar volume of natural gas produced by the gas well in m 3/mol.
4. A method of calculating the critical fluid accumulation of a surface relief pipe section according to claim 3, wherein: the calculation process of the average dip angle theta ave of the undulating pipe section comprises the following steps:
Wherein: h i is the undulating elevation corresponding to the ith undulating pipe section, and the unit is m;
l i is the length of the pipeline corresponding to the i-th section of undulating pipe section, and the unit is m.
5. The method for calculating the critical fluid accumulation of the ground heave pipe section according to claim 4, wherein: the calculation process of the total length L of the undulating pipe section is as follows:
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104565825A (en) * | 2013-10-29 | 2015-04-29 | 中国石油天然气股份有限公司 | Detection method for judging pipe cleaning time of wet gas gathering and transportation pipe network |
| CN112214940A (en) * | 2020-09-30 | 2021-01-12 | 西南石油大学 | Method for identifying high-risk section of wet natural gas pipeline internal corrosion |
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| US10024499B2 (en) * | 2016-12-21 | 2018-07-17 | Chevron U.S.A. Inc. | Method and system for controlling slugging in a fluid processing system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104565825A (en) * | 2013-10-29 | 2015-04-29 | 中国石油天然气股份有限公司 | Detection method for judging pipe cleaning time of wet gas gathering and transportation pipe network |
| CN112214940A (en) * | 2020-09-30 | 2021-01-12 | 西南石油大学 | Method for identifying high-risk section of wet natural gas pipeline internal corrosion |
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