CN110207012B - Simulation device and simulation method for long-distance pipeline - Google Patents
Simulation device and simulation method for long-distance pipeline Download PDFInfo
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- CN110207012B CN110207012B CN201910525531.5A CN201910525531A CN110207012B CN 110207012 B CN110207012 B CN 110207012B CN 201910525531 A CN201910525531 A CN 201910525531A CN 110207012 B CN110207012 B CN 110207012B
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- 238000004088 simulation Methods 0.000 title claims abstract description 66
- 238000000034 method Methods 0.000 title claims abstract description 20
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 164
- 239000003345 natural gas Substances 0.000 claims abstract description 82
- 239000007789 gas Substances 0.000 claims description 281
- 238000002156 mixing Methods 0.000 claims description 44
- 239000000463 material Substances 0.000 claims description 31
- 238000009933 burial Methods 0.000 claims description 30
- 238000000746 purification Methods 0.000 claims description 19
- 230000005540 biological transmission Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 9
- 239000012530 fluid Substances 0.000 abstract description 8
- 238000004364 calculation method Methods 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000002689 soil Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 150000004677 hydrates Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/02—Pipe-line systems for gases or vapours
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
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Abstract
The invention provides a simulation device and a simulation method for a long-distance pipeline, which are characterized in that the simulation device is designed, process simulation software HYSYS is used for simulating the simulation device, the actual running state of the pipeline is monitored, the monitored data are subjected to simulation calculation through the HYSYS software, the simulation results of fluid flow, temperature, pressure, natural gas components and the like are obtained, the simulation results play a role in guiding and regulating actual production, and the simulation results have important guiding significance for the type selection of equipment for secondary processing of downstream natural gas.
Description
Technical Field
The invention belongs to the field of natural gas gathering and transportation, and particularly relates to a simulation device and a simulation method for a long-distance transportation pipeline, in particular to a simulation device and a simulation method for a natural gas long-distance transportation pipeline.
Background
Long transport pipelines refer to pipelines used for transporting commodity media among production places, storage facilities and using units. In general, natural gas produced by a gas well is intensively conveyed to a gas collecting station through a long-distance pipeline, the gas collecting station is intensively conveyed to a purification plant for treatment after being summarized, and before the purification treatment of the natural gas, adjacent production processes are mutually related in terms of working parameters, running states, production safety and the like, and are mutually influenced, so that the former process is normally and smoothly carried out and meets the expected requirement, and the necessary condition for realizing the latter process is realized.
The natural gas gathering and transportation is completed through a gathering and transportation pipe network (the gathering and transportation pipe network is a large-area net-shaped pipe structure formed by metal or nonmetal pipes with different pipe diameters and different wall thicknesses), the natural gas gathering and transportation pipe network is a net-shaped pipe system formed by gas production pipelines from a gas well wellhead to a gas gathering station and raw gas transportation pipes from the gas gathering station, a single well station to a natural gas treatment plant (including a natural gas purification plant) in a gas field or a certain gas production area, and is an indispensable production facility in the ground production process of natural gas.
In natural gas gathering and transportation, because of the lack of a simulation device and simulation calculation of a gathering and transportation pipeline network, the flow, the temperature and the pressure of fluid cannot be exactly obtained in the gathering and transportation process, and even in the pipeline transportation, due to the temperature reduction in the pipeline, a few hydrates are generated, which seriously affect equipment such as a downstream compressor, a heat exchanger and the like.
Disclosure of Invention
The embodiment of the invention aims to provide a simulation device and a simulation method for a long-distance pipeline, so as to overcome the technical defects.
In order to solve the technical problems, the invention provides a simulation device for a long-distance pipeline, which is characterized in that: the gas well system comprises four groups of gas wells, namely a first gas well, a second gas well, a third gas well and a fourth gas well;
the wellhead of the first gas well is connected with the inlet end of the first gas pipeline, the wellhead of the second gas well is connected with the inlet end of the second gas pipeline, the wellhead of the third gas well is connected with the inlet end of the third gas pipeline, and the fourth gas well is connected with the inlet end of the fourth gas pipeline;
the outlet end of the first gas pipeline and the outlet end of the second gas pipeline are both connected to the inlet of the same gas collecting station A, the outlet of the gas collecting station A is connected with the inlet end of the mixed pipeline A, the outlet end of the mixed pipeline A and the outlet end of the third gas pipeline are both connected to the inlet of the same gas collecting station B, the outlet of the gas collecting station B is connected with the inlet end of the mixed pipeline B, the outlet end of the mixed pipeline B and the outlet end of the fourth gas pipeline are both connected to the inlet of the same gas collecting station C, the outlet of the gas collecting station C is connected with the inlet end of the mixed pipeline C, and the outlet end of the mixed pipeline C is connected to a purification plant.
In addition, the invention also provides a simulation method of the simulation device of the long-distance pipeline, which comprises the following steps:
step one, establishing a simulation device of a long-distance pipeline by utilizing HYSYS software, and inputting temperature values and pressure values of four gas wells into the HYSYS software: the temperature of the natural gas produced by the first gas well 1 is 49 ℃, the pressure is 4135kPa, the temperature of the natural gas produced by the second gas well 2 is 45 ℃, the pressure is 3450kPa, the temperature of the natural gas produced by the third gas well 3 is 40 ℃, the pressure is 3497kPa, and the temperature of the natural gas produced by the fourth gas well 4 is 35 ℃, and the pressure is 4395kPa;
step two, according to the input temperature value and pressure value, HYSYS software simulates a simulation device of the long-distance pipeline, monitors the actual running state of the long-distance pipeline, records a simulation result, and obtains the natural gas temperature of 35.4 ℃ and the pressure of 3269kPa, and the flow rate of 425kmole/h output by the first gas pipeline; the temperature of the natural gas output by the second gas pipeline is 43.3 ℃, the pressure is 3276kPa, and the flow is 375kmole/h; the natural gas output by the first gas pipeline and the natural gas output by the second gas pipeline enter a gas collecting station A together for mixing, the material flow temperature output by the gas collecting station A is 36.3 ℃, the pressure is 3269kPa, and the flow rate is 800kgmole/h; the output material flow enters a mixing pipeline A, the temperature of the material flow output by the mixing pipeline A is 5 ℃, the pressure is 2754kPa, and the flow is 800kgmole/h;
the temperature of natural gas output by the gas transmission pipeline III is 4.8 ℃, the pressure is 2044kPa, and the flow is 575kgmole/h; the natural gas output by the third gas pipeline and the material flow output by the mixing pipeline A enter a gas collecting station B together for mixing, the material flow temperature output by the gas collecting station B is 1.1 ℃, the pressure is 2044kPa, and the flow rate is 1375kgmole/h; the output material flow enters a mixing pipeline B, the temperature of the material flow output by the mixing pipeline B is 4.9 ℃, the pressure is 1797kPa, and the flow is 1375kgmole/h;
the temperature of the natural gas output by the fourth gas pipeline is 4.9 ℃, the pressure is 2946kPa, and the flow rate is 545kgmole/h; the natural gas output by the fourth gas pipeline and the material flow output by the mixed pipeline B are jointly fed into the gas collecting station C for mixing, the temperature of the natural gas output by the gas collecting station C is 5.6 ℃, the pressure is 1797kPa, the material flow temperature output by the mixed pipeline C is 4.9 ℃, the pressure is 1596kPa, the flow rate is 1920kgmole/h, and the material flow is directly fed into a purification plant.
Preferably, the first gas pipeline is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 150 meters, the altitude is 645 meters, and the height difference is +6 meters; the length of the pipe section II is 125 meters, the altitude is 636.5 meters, and the altitude difference is-8.5 meters; the length of the pipe section III is 100 meters, the altitude is 637 meters, and the altitude difference is +0.5 meters; the ground surface burial depths of the three pipe sections are all 1 meter.
Further, the second gas pipeline consists of a pipeline section, wherein the length of the pipeline section is 200 meters, the altitude is 637 meters, the height difference is +23 meters, and the ground surface burial depth is 1 meter.
Preferably, the third gas pipeline is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 160 meters, the altitude is 648 meters, and the height difference is +12.5 meters; the length of the pipe section II is 100 meters, the altitude is 634 meters, and the altitude difference is-14 meters; the length of the pipe section III is 205 meters, the altitude is 633 meters, and the altitude difference is-4 meters; the ground surface burial depths of the three pipe sections are all 1 meter.
Preferably, the fourth gas pipeline is formed by connecting two pipeline sections, wherein the length of the pipeline section I is 180 meters, the altitude is 625 meters, and the altitude difference is-7.5 meters; the length of the pipe section II is 165 meters, the altitude is 617 meters, and the altitude difference is-8 meters; the surface burial depths of the two pipe sections are 1 meter.
Further, the mixing pipeline A consists of a pipe section, wherein the length of the pipe section is 355 meters, the altitude is 633 meters, and the altitude difference is-1 meter; the surface burial depth of the pipe section is 1 meter.
Further, the mixing pipeline B consists of a pipe section, wherein the length of the pipe section is 300 meters, the altitude is 617 meters, and the altitude difference is-16 meters; the surface burial depth of the pipe section is 1 meter.
Preferably, the mixing pipeline C consists of a pipe section, the length of the pipe section is 340 m, the altitude is 604 m, the altitude difference is 13 m, and the surface burial depth of the pipe section is 1 m.
The beneficial effects of the invention are as follows: according to the simulation device and the simulation method for the long-distance pipeline, the simulation device is designed, the process simulation software HYSYS is used for simulating the simulation device, the actual running state of the pipeline is monitored, the monitored data are subjected to simulation calculation through the HYSYS software, the simulation results of fluid flow, pressure and temperature of each branch line, natural gas components of each branch line and the like are obtained through the simulation calculation, the simulation results play a role in guiding and regulating actual production, and the simulation results have important guiding significance particularly for equipment selection of downstream natural gas secondary processing.
In order to make the above-mentioned objects of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
Fig. 1 is a schematic structural view of a simulation device of a long-distance pipeline.
Reference numerals illustrate:
1. a gas well number one; 2. a gas well number two; 3. a gas well number three; 4. a gas well number four; 5. a gas collecting station A;6. a mixing line A;7. a gas collecting station B;8. a mixing line B;9. a gas collecting station C;10. a mixing line C;11. a purification plant;
101. a first gas line; 201. a second gas line; 301. a third gas line; 401. and a fourth gas pipeline.
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present specification, by describing the embodiments of the present invention with specific examples.
In the present invention, the upper, lower, left, and right in the drawings are regarded as the upper, lower, left, and right of the long-distance pipeline simulation device described in the present specification.
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
Example 1:
the first embodiment of the invention relates to a simulation device of a long-distance pipeline, which comprises four groups of gas wells, namely a first gas well 1, a second gas well 2, a third gas well 3 and a fourth gas well 4;
the wellhead of the first gas well 1 is connected with the inlet end of the first gas pipeline 101, the wellhead of the second gas well 2 is connected with the inlet end of the second gas pipeline 201, the wellhead of the third gas well 3 is connected with the inlet end of the third gas pipeline 301, and the fourth gas well 4 is connected with the inlet end of the fourth gas pipeline 401;
the outlet end of the first gas pipeline 101 and the outlet end of the second gas pipeline 201 are both connected to the inlet of the same gas collecting station A5, the outlet of the gas collecting station A5 is connected with the inlet end of the mixed pipeline A6, the outlet end of the mixed pipeline A6 and the outlet end of the third gas pipeline 301 are both connected to the inlet of the same gas collecting station B7, the outlet of the gas collecting station B7 is connected with the inlet end of the mixed pipeline B8, the outlet end of the mixed pipeline B8 and the outlet end of the fourth gas pipeline 401 are both connected to the inlet of the same gas collecting station C9, the outlet of the gas collecting station C9 is connected with the inlet end of the mixed pipeline C10, and the outlet end of the mixed pipeline C10 is connected to the purification plant 11.
The working process of the simulation device of the long-distance pipeline in the embodiment is as follows:
the natural gas produced by the four groups of gas wells is transported through a first gas pipeline 101, a second gas pipeline 201, a third gas pipeline 301 and a fourth gas pipeline 401 respectively, specifically, the first gas pipeline 101 and the second gas pipeline 201 transport the natural gas to a gas collecting station A5 respectively, throttling and depressurizing the natural gas sent by each gas well in the gas collecting station A5 respectively, separating free liquid and other mechanical impurities in the gas, measuring the gas well yield, inputting the gas into a mixing pipeline A6 after completion, connecting the natural gas in the mixing pipeline A6 and the natural gas in the third gas pipeline 301 to a gas collecting station B7, simultaneously inputting the gas into a mixing pipeline C10 through the mixing pipeline B8 and the fourth gas pipeline 401 after throttling and depressurizing and measuring, and then connecting the gas to a purification plant 11 through the mixing pipeline C10 to enter the purification plant 11 for purification treatment.
The gas collecting station refers to a transfer station for collecting and processing natural gas. And then, converging the gas of each gas well and inputting the gas into a gas collecting dry line by the gas collecting station. Because the gas throttling and depressurization is accompanied by the reduction of the gas temperature, if the gas pressure and temperature conditions are in a hydrate generation area, a gas heating device is arranged at the upstream of the throttling and depressurization so as to avoid the generation of hydrate and the blockage of a pipeline. The gas collecting station mainly comprises 6 systems, namely a natural gas pressure regulating and metering system, a natural gas purifying system, a natural gas compressing system, a natural gas storage system, a CNG (compressed natural gas) filling system and a control system. And (3) after the natural gas conveyed to the gas filling station is subjected to pressure stabilization and metering, the natural gas enters a purification treatment device for purification treatment, is pressurized by a compressor, is dehydrated at high pressure, is conveyed into a gas storage system by a sequence control panel, and is finally metered to the outside by a gas filling machine for gas filling.
The simulation device provided by the embodiment is utilized to simulate the natural gas gathering and transportation pipe network, the gas field gathering and transportation pipe is simulated according to the application flow simulation software HYSYS of the natural gas gathering and transportation pipe network, the actual running state of the pipe is monitored, the data such as the temperature, the pressure and the flow of the fluid in the gathering and transportation process are obtained, the diameter of the gathering and transportation pipe can be determined according to the distance and the elevation of the gas well from the gas gathering station, the composition, the temperature and the pressure of the natural gas which are externally transported to the downstream are estimated, and the simulation device has important guiding significance for the type selection of equipment for secondary processing of the downstream natural gas.
Example 2:
the second embodiment of the invention relates to a simulation device of a long-distance pipeline, which is shown in fig. 1, and comprises four groups of gas wells, namely a first gas well 1, a second gas well 2, a third gas well 3 and a fourth gas well 4;
the wellhead of the first gas well 1 is connected with the inlet end of the first gas pipeline 101, the wellhead of the second gas well 2 is connected with the inlet end of the second gas pipeline 201, the wellhead of the third gas well 3 is connected with the inlet end of the third gas pipeline 301, and the fourth gas well 4 is connected with the inlet end of the fourth gas pipeline 401;
the outlet end of the first gas pipeline 101 and the outlet end of the second gas pipeline 201 are both connected to the inlet of the same gas collecting station A5, the outlet of the gas collecting station A5 is connected with the inlet end of the mixed pipeline A6, the outlet end of the mixed pipeline A6 and the outlet end of the third gas pipeline 301 are both connected to the inlet of the same gas collecting station B7, the outlet of the gas collecting station B7 is connected with the inlet end of the mixed pipeline B8, the outlet end of the mixed pipeline B8 and the outlet end of the fourth gas pipeline 401 are both connected to the inlet of the same gas collecting station C9, the outlet of the gas collecting station C9 is connected with the inlet end of the mixed pipeline C10, and the outlet end of the mixed pipeline C10 is connected to the purification plant 11.
Specifically, as a preferred example, the present embodiment gives the optimal data value of the simulation apparatus, referring to the following:
the first gas pipeline 101 is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 150 meters, the altitude is 645 meters, and the height difference is +6 meters; the length of the pipe section II is 125 meters, the altitude is 636.5 meters, and the altitude difference is-8.5 meters; the length of the pipe section III is 100 meters, the altitude is 637 meters, and the altitude difference is +0.5 meters; the ground surface burial depths of the three pipe sections are all 1 meter.
The second gas line 201 is composed of a pipe section with a length of 200 m, an altitude of 637 m, a height difference of +23 m, and a buried depth of 1 m.
The third gas pipeline 301 is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 160 meters, the altitude is 648 meters, and the altitude difference is +12.5 meters; the length of the pipe section II is 100 meters, the altitude is 634 meters, and the altitude difference is-14 meters; the length of the pipe section III is 205 meters, the altitude is 633 meters, and the altitude difference is-4 meters; the ground surface burial depths of the three pipe sections are all 1 meter.
The fourth gas pipeline 401 is formed by connecting two pipe sections, wherein the length of the pipe section I is 180 meters, the altitude is 625 meters, and the altitude difference is-7.5 meters; the length of the pipe section II is 165 meters, the altitude is 617 meters, and the altitude difference is-8 meters; the surface burial depths of the two pipe sections are 1 meter.
The altitude is also called absolute altitude, and refers to the difference between a certain place and the sea level, and is usually calculated by taking the average sea level as a standard, and represents the vertical distance between the place on the ground and the sea level; the height difference is the difference in elevation between two points, i.e., the end elevation minus the start elevation.
Example 3:
referring to fig. 1, a third embodiment of the present invention relates to a simulation apparatus for a long-distance pipeline, comprising four groups of gas wells, namely a first gas well 1, a second gas well 2, a third gas well 3 and a fourth gas well 4;
the wellhead of the first gas well 1 is connected with the inlet end of the first gas pipeline 101, the wellhead of the second gas well 2 is connected with the inlet end of the second gas pipeline 201, the wellhead of the third gas well 3 is connected with the inlet end of the third gas pipeline 301, and the fourth gas well 4 is connected with the inlet end of the fourth gas pipeline 401;
the outlet end of the first gas pipeline 101 and the outlet end of the second gas pipeline 201 are both connected to the inlet of the same gas collecting station A5, the outlet of the gas collecting station A5 is connected with the inlet end of the mixed pipeline A6, the outlet end of the mixed pipeline A6 and the outlet end of the third gas pipeline 301 are both connected to the inlet of the same gas collecting station B7, the outlet of the gas collecting station B7 is connected with the inlet end of the mixed pipeline B8, the outlet end of the mixed pipeline B8 and the outlet end of the fourth gas pipeline 401 are both connected to the inlet of the same gas collecting station C9, the outlet of the gas collecting station C9 is connected with the inlet end of the mixed pipeline C10, and the outlet end of the mixed pipeline C10 is connected to the purification plant 11.
Specifically, as a preferred example, the present embodiment gives the optimal data value of the simulation apparatus, referring to the following:
the first gas pipeline 101 is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 150 meters, the altitude is 645 meters, and the height difference is +6 meters; the length of the pipe section II is 125 meters, the altitude is 636.5 meters, and the altitude difference is-8.5 meters; the length of the pipe section III is 100 meters, the altitude is 637 meters, and the altitude difference is +0.5 meters; the ground surface burial depths of the three pipe sections are all 1 meter.
The second gas line 201 is composed of a pipe section with a length of 200 m, an altitude of 637 m, a height difference of +23 m, and a buried depth of 1 m.
The third gas pipeline 301 is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 160 meters, the altitude is 648 meters, and the altitude difference is +12.5 meters; the length of the pipe section II is 100 meters, the altitude is 634 meters, and the altitude difference is-14 meters; the length of the pipe section III is 205 meters, the altitude is 633 meters, and the altitude difference is-4 meters; the ground surface burial depths of the three pipe sections are all 1 meter.
The fourth gas pipeline 401 is formed by connecting two pipe sections, wherein the length of the pipe section I is 180 meters, the altitude is 625 meters, and the altitude difference is-7.5 meters; the length of the pipe section II is 165 meters, the altitude is 617 meters, and the altitude difference is-8 meters; the surface burial depths of the two pipe sections are 1 meter.
The mixing pipeline A6 consists of a pipe section, the length of the pipe section is 355 meters, the altitude is 633 meters, and the altitude difference is-1 meter; the surface burial depth of the pipe section is 1 meter.
The mixing pipeline B8 consists of a pipe section, the length of the pipe section is 300 meters, the altitude is 617 meters, and the altitude difference is-16 meters; the surface burial depth of the pipe section is 1 meter.
The mixing pipeline C10 consists of a pipeline section, wherein the length of the pipeline section is 340 m, the altitude is 604 m, the altitude difference is-13 m, and the surface burial depth of the pipeline section is 1 m.
Example 4:
the embodiment provides a simulation method of a simulation device of a long-distance pipeline, which comprises the following steps:
step one, utilizing HYSYS software to establish a simulation device of a long-distance pipeline, wherein the simulation device of the long-distance pipeline comprises four groups of gas wells, namely a first gas well 1, a second gas well 2, a third gas well 3 and a fourth gas well 4;
the wellhead of the first gas well 1 is connected with the inlet end of the first gas pipeline 101, the wellhead of the second gas well 2 is connected with the inlet end of the second gas pipeline 201, the wellhead of the third gas well 3 is connected with the inlet end of the third gas pipeline 301, and the fourth gas well 4 is connected with the inlet end of the fourth gas pipeline 401;
the outlet end of the first gas pipeline 101 and the outlet end of the second gas pipeline 201 are both connected to the inlet of the same gas collecting station A5, the outlet of the gas collecting station A5 is connected with the inlet end of the mixed pipeline A6, the outlet end of the mixed pipeline A6 and the outlet end of the third gas pipeline 301 are both connected to the inlet of the same gas collecting station B7, the outlet of the gas collecting station B7 is connected with the inlet end of the mixed pipeline B8, the outlet end of the mixed pipeline B8 and the outlet end of the fourth gas pipeline 401 are both connected to the inlet of the same gas collecting station C9, the outlet of the gas collecting station C9 is connected with the inlet end of the mixed pipeline C10, and the outlet end of the mixed pipeline C10 is connected to the purification plant 11.
Specifically, as a preferred example, the present embodiment gives the optimal data value of the simulation apparatus, referring to the following:
the first gas pipeline 101 is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 150 meters, the altitude is 645 meters, and the height difference is +6 meters; the length of the pipe section II is 125 meters, the altitude is 636.5 meters, and the altitude difference is-8.5 meters; the length of the pipe section III is 100 meters, the altitude is 637 meters, and the altitude difference is +0.5 meters; the ground surface burial depths of the three pipe sections are all 1 meter. The second gas line 201 is composed of a pipe section with a length of 200 m, an altitude of 637 m, a height difference of +23 m, and a buried depth of 1 m. The third gas pipeline 301 is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 160 meters, the altitude is 648 meters, and the altitude difference is +12.5 meters; the length of the pipe section II is 100 meters, the altitude is 634 meters, and the altitude difference is-14 meters; the length of the pipe section III is 205 meters, the altitude is 633 meters, and the altitude difference is-4 meters; the ground surface burial depths of the three pipe sections are all 1 meter. The fourth gas pipeline 401 is formed by connecting two pipe sections, wherein the length of the pipe section I is 180 meters, the altitude is 625 meters, and the altitude difference is-7.5 meters; the length of the pipe section II is 165 meters, the altitude is 617 meters, and the altitude difference is-8 meters; the surface burial depths of the two pipe sections are 1 meter.
The mixing pipeline A6 consists of a pipe section, the length of the pipe section is 355 meters, the altitude is 633 meters, and the altitude difference is-1 meter; the surface burial depth of the pipe section is 1 meter. The mixing pipeline B8 consists of a pipe section, the length of the pipe section is 300 meters, the altitude is 617 meters, and the altitude difference is-16 meters; the surface burial depth of the pipe section is 1 meter. The mixing pipeline C10 consists of a pipeline section, wherein the length of the pipeline section is 340 m, the altitude is 604 m, the altitude difference is-13 m, and the surface burial depth of the pipeline section is 1 m.
Next, corresponding parameters are entered or selected in the HYSYS software, such as temperature and pressure values of the fluid in each pipe in the simulation device:
step one, establishing a simulation device of a long-distance pipeline by utilizing HYSYS software, and inputting temperature values and pressure values of four gas wells into the HYSYS software: the temperature of the natural gas produced by the first gas well 1 is 49 ℃, the pressure is 4135kPa, the temperature of the natural gas produced by the second gas well 2 is 45 ℃, the pressure is 3450kPa, the temperature of the natural gas produced by the third gas well 3 is 40 ℃, the pressure is 3497kPa, and the temperature of the natural gas produced by the fourth gas well 4 is 35 ℃, and the pressure is 4395kPa;
step two, according to the input temperature value and pressure value, the HYSYS software simulates a simulation device of the long-distance pipeline, monitors the actual running state of the long-distance pipeline, records a simulation result, wherein the simulation result comprises the flow, the temperature and the pressure of fluid and the components of natural gas, and the specific simulation result is obtained as follows: the temperature of the natural gas output by the first gas pipeline 101 is 35.4 ℃, the pressure is 3269kPa, and the flow is 425kmole/h; the temperature of the natural gas output by the second gas pipeline 201 is 43.3 ℃, the pressure is 3276kPa, and the flow is 375kmole/h; the natural gas output by the first gas pipeline 101 and the natural gas output by the second gas pipeline 201 enter a gas collecting station A5 together for mixing, the material flow temperature output by the gas collecting station A5 is 36.3 ℃, the pressure is 3269kPa, and the flow rate is 800kgmole/h; the output material flow enters a mixing pipeline A6, the temperature of the material flow output by the mixing pipeline A6 is 5 ℃, the pressure is 2754kPa, and the flow is 800kgmole/h;
the temperature of the natural gas output by the gas transmission pipeline 301 of the third grade is 4.8 ℃, the pressure is 2044kPa, and the flow is 575kgmole/h; the natural gas output by the third gas pipeline 301 and the material flow output by the mixing pipeline A6 enter a gas collecting station B7 together for mixing, the material flow output by the gas collecting station B7 has the temperature of 1.1 ℃, the pressure of 2044kPa and the flow rate of 1375kgmole/h; the output material flow enters a mixing pipeline B8, the temperature of the material flow output by the mixing pipeline B8 is 4.9 ℃, the pressure is 1797kPa, and the flow is 1375kgmole/h;
the temperature of the natural gas output by the gas pipeline No. 401 is 4.9 ℃, the pressure is 2946kPa, and the flow rate is 545kgmole/h; the natural gas output by the fourth gas pipeline 401 and the material flow output by the mixed pipeline B8 are jointly fed into the gas collecting station C9 for mixing, the temperature of the natural gas output by the gas collecting station C9 is 5.6 ℃, the pressure is 1797kPa, the material flow temperature output by the mixed pipeline C10 is 4.9 ℃, the pressure is 1596kPa, the flow rate is 1920kgmole/h, and the material flow is directly fed into the purification plant 11.
It is noted that the above flow units kmole/h and kmole/h are the same meaning and each represents one thousand moles per hour.
In particular, the molar composition of natural gas for the four gas wells calculated according to the HYSYS software is shown below:
table 1 table of molar composition of natural gas for gas well 1
| Component (A) | C 1 | C 2 | C 3 | i-c 4 | n-c4 | i-c5 | n-c5 | C 6 | N 2 | H 2 S | CO 2 | H 2 O |
| Composition of the composition | 72.5% | 8.2% | 4.6% | 1.5% | 1.8% | 1.2% | 1.3% | 0.9% | 0 | 4.1% | 1.5% | 0 |
Table 2 table of natural gas molar composition for gas well No. 2
| Component (A) | C 1 | C 2 | C 3 | i-c 4 | n-c4 | i-c5 | n-c5 | C 6 | N 2 | H 2 S | CO 2 | H 2 O |
| Composition of the composition | 68% | 19.2% | 7.1% | 1.2% | 0.9% | 0.4% | 0.2% | 0 | 0.3% | 2.4% | 0.5% | 0 |
Table 3 table of molar composition of natural gas for gas well No. 3
| Component (A) | C 1 | C 2 | C 3 | i-c 4 | n-c4 | i-c5 | n-c5 | C 6 | N 2 | H 2 S | CO 2 | H 2 O |
| Composition of the composition | 56.6% | 25.5% | 1.5% | 0.4% | 0.8% | 0.4% | 0.4% | 0.6% | 0.5% | 1.4% | 2.1% | 9% |
Table 4 table of molar composition of natural gas for gas well No. 4
| Component (A) | C 1 | C 2 | C 3 | i-c 4 | n-c4 | i-c5 | n-c5 | C 6 | N 2 | H 2 S | CO 2 | H 2 O |
| Composition of the composition | 41.8% | 8.9% | 7.1% | 1.5% | 3.8% | 1.3% | 1.6% | 0 | 1% | 0 | 0.4% | 0 |
TABLE 5 molar composition of natural gas for purification plants
| Component (A) | C 1 | C 2 | C 3 | i-c 4 | n-c4 | i-c5 | n-c5 | C 6 | N 2 | H 2 S | CO 2 | H 2 O |
| Composition of the composition | 58.2% | 15.7% | 4.8% | 1.1% | 1.9% | 0.8% | 0.9% | 0.4% | 0.5% | 1.8% | 1.1% | 2.7% |
From the molar composition tables of the natural gas in tables 1 to 5, it can be inferred that the water content was reduced from 9% to 2.7% without great change in other components as the natural gas flowed in the pipeline, because the water content in the pipeline was changed with the temperature change of the long-distance pipeline, and most of the water content was evaporation loss due to the temperature gradient after mixing of each branch line.
The simulation system and the simulation method of the long-distance pipeline are used for calculating the temperature and the pressure of the fluid according to the heat loss caused by the temperature difference between the natural gas in the pipeline and the external environment when the two-phase flow flows in the pipeline. The temperature and pressure changes of the fluid are also related to the heat transfer coefficient of the inner wall of the pipe, the insulation material, the material heat conductivity, the soil type, the soil heat conductivity, the depth of burial. The simulation system and the method of the long-distance pipeline can determine the diameter of the gathering and conveying pipeline according to the composition of the raw gas, the distance and the elevation of the gas well from the gathering and conveying station, and estimate the composition, the temperature and the pressure of the natural gas which is externally conveyed to the downstream, so that the simulation system and the simulation method have important guiding significance for the type selection of equipment for secondary processing of the downstream natural gas.
It will be understood by those of ordinary skill in the art that the foregoing embodiments are specific examples of carrying out the invention and that various changes in form and details may be made therein without departing from the spirit and scope of the invention.
Claims (7)
1. The utility model provides a long-distance pipeline's analogue means which characterized in that: the gas well system comprises four groups of gas wells, namely a first gas well (1), a second gas well (2), a third gas well (3) and a fourth gas well (4);
the wellhead of the first gas well (1) is connected with the inlet end of the first gas pipeline (101), the wellhead of the second gas well (2) is connected with the inlet end of the second gas pipeline (201), the wellhead of the third gas well (3) is connected with the inlet end of the third gas pipeline (301), and the fourth gas well (4) is connected with the inlet end of the fourth gas pipeline (401);
the outlet end of the first gas pipeline (101) and the outlet end of the second gas pipeline (201) are both connected to the inlet of the same gas collecting station A (5), the outlet of the gas collecting station A (5) is connected with the inlet end of the mixed pipeline A (6), the outlet end of the mixed pipeline A (6) and the outlet end of the third gas pipeline (301) are both connected to the inlet of the same gas collecting station B (7), the outlet of the gas collecting station B (7) is connected with the inlet end of the mixed pipeline B (8), the outlet end of the mixed pipeline B (8) and the outlet end of the fourth gas pipeline (401) are both connected to the inlet of the same gas collecting station C (9), the outlet of the gas collecting station C (9) is connected with the inlet end of the mixed pipeline C (10), and the outlet end of the mixed pipeline C (10) is connected to the purification plant (11);
the first gas transmission pipeline (101) is formed by sequentially connecting three pipeline sections, wherein the length of the pipeline section I is 150 meters, the altitude is 645 meters, and the height difference is +6 meters; the length of the pipe section II is 125 meters, the altitude is 636.5 meters, and the altitude difference is-8.5 meters; the length of the pipe section III is 100 meters, the altitude is 637 meters, and the altitude difference is +0.5 meters; the ground surface burial depths of the three pipe sections are all 1 meter;
the second gas pipeline (201) consists of a pipeline section, wherein the length of the pipeline section is 200 meters, the altitude is 637 meters, the height difference is +23 meters, and the ground surface burial depth is 1 meter.
2. The long-distance pipeline simulator of claim 1, wherein: the third gas pipeline (301) is formed by sequentially connecting three pipe sections, wherein the length of the pipe section I is 160 meters, the altitude is 648 meters, and the height difference is +12.5 meters; the length of the pipe section II is 100 meters, the altitude is 634 meters, and the altitude difference is-14 meters; the length of the pipe section III is 205 meters, the altitude is 633 meters, and the altitude difference is-4 meters; the ground surface burial depths of the three pipe sections are all 1 meter.
3. The long-distance pipeline simulator of claim 1, wherein: the fourth gas pipeline (401) is formed by connecting two pipeline sections, wherein the length of the pipeline section I is 180 meters, the altitude is 625 meters, and the altitude difference is-7.5 meters; the length of the pipe section II is 165 meters, the altitude is 617 meters, and the altitude difference is-8 meters; the surface burial depths of the two pipe sections are 1 meter.
4. The long-distance pipeline simulator of claim 1, wherein: the mixing pipeline A (6) consists of a pipe section, wherein the length of the pipe section is 355 meters, the altitude is 633 meters, and the altitude difference is-1 meter; the surface burial depth of the pipe section is 1 meter.
5. The long-distance pipeline simulator of claim 1, wherein: the mixing pipeline B (8) consists of a pipeline section, wherein the length of the pipeline section is 300 meters, the altitude is 617 meters, and the altitude difference is-16 meters; the surface burial depth of the pipe section is 1 meter.
6. The long-distance pipeline simulator of claim 1, wherein: the mixed pipeline C (10) consists of a pipeline section, wherein the length of the pipeline section is 340 m, the altitude is 604 m, the elevation difference is-13 m, and the ground surface burial depth of the pipeline section is 1 m.
7. A simulation method of a simulation apparatus of a long-distance pipeline according to any one of claims 1 to 6, comprising the steps of:
step one, establishing a simulation device of a long-distance pipeline by utilizing HYSYS software, and inputting temperature values and pressure values of four gas wells into the HYSYS software: the temperature of the natural gas produced by the first gas well (1) is 49 ℃, the pressure is 4135kPa, the temperature of the natural gas produced by the second gas well (2) is 45 ℃, the pressure is 3450kPa, the temperature of the natural gas produced by the third gas well (3) is 40 ℃, the pressure is 3497kPa, and the temperature of the natural gas produced by the fourth gas well (4) is 35 ℃, the pressure is 4395kPa;
step two, according to the input temperature value and pressure value, HYSYS software simulates a simulation device of the long-distance pipeline, monitors the actual running state of the long-distance pipeline, records a simulation result, and obtains the natural gas temperature of 35.4 ℃ and the pressure of 3269kPa and the flow rate of 425kmole/h output by the first gas pipeline (101); the temperature of the natural gas output by the second gas pipeline (201) is 43.3 ℃, the pressure is 3276kPa, and the flow is 375kmole/h; natural gas output by the first gas pipeline (101) and natural gas output by the second gas pipeline (201) enter a gas collecting station A (5) together for mixing, the material flow temperature output by the gas collecting station A (5) is 36.3 ℃, the pressure is 3269kPa, and the flow rate is 800kgmole/h; the output material flow enters a mixing pipeline A (6), the temperature of the material flow output by the mixing pipeline A (6) is 5 ℃, the pressure is 2754kPa, and the flow is 800kgmole/h;
the temperature of natural gas output by the gas pipeline III (301) is 4.8 ℃, the pressure is 2044kPa, and the flow is 575kgmole/h; natural gas output by the third gas pipeline (301) and a material flow output by the mixing pipeline A (6) jointly enter a gas collecting station B (7) for mixing, and the material flow output by the gas collecting station B (7) has the temperature of 1.1 ℃, the pressure of 2044kPa and the flow rate of 1375kgmole/h; the output material flow enters a mixing pipeline B (8), the temperature of the material flow output by the mixing pipeline B (8) is 4.9 ℃, the pressure is 1797kPa, and the flow is 1375kgmole/h;
the temperature of natural gas output by a fourth gas pipeline (401) is 4.9 ℃, the pressure is 2946kPa, and the flow rate is 545kgmole/h; the natural gas output by the fourth gas pipeline (401) and the material flow output by the mixed pipeline B (8) are jointly fed into the gas collecting station C (9) for mixing, the temperature of the natural gas output by the gas collecting station C (9) is 5.6 ℃, the pressure is 1797kPa, the material flow temperature output by the mixed pipeline C (10) is 4.9 ℃, the pressure is 1596kPa, the flow rate is 1920kgmole/h, and the material flow is directly fed into the purification plant (11).
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