CN111832232A - Technical method for diagnosing and identifying accumulated liquid in pipeline - Google Patents
Technical method for diagnosing and identifying accumulated liquid in pipeline Download PDFInfo
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Abstract
The invention relates to the technical field of gas field gathering and transportation pipe networks, in particular to a technical method for diagnosing and identifying accumulated liquid in a pipeline, wherein gathering and transportation simulation software is adopted to carry out modeling analysis on a gathering and transportation pipe network, a first-order derivative is adopted to carry out diagnosis analysis on the pressure loss of the pipeline along the way, the actual gas flow speed and the critical liquid carrying flow speed of the pipeline along the way are compared and analyzed according to the simulation analysis result of the software, and the position of the accumulated liquid generated in the pipeline is preliminarily identified; according to the method, the pressure curve of the pipeline along the way is differentiated according to the software simulation analysis result, the pressure loss curve of the pipeline along the way in unit length is established, the maximum pressure loss point of the pipeline along the way is determined, the position of the accumulated liquid in the pipeline is accurately determined, and the accuracy of identifying the accumulated liquid point in the pipeline is improved.
Description
Technical Field
The invention relates to the technical field of gas field gathering and transportation pipe networks, in particular to a technical method for diagnosing and identifying accumulated liquid in a pipeline.
Background
With the popularization of clean energy in China, the projects of 'gas replacing oil' and 'gas replacing coal' are continuously promoted, the demand for natural gas is increasing day by day, and the development of domestic natural gas needs to be enhanced.
The wet gas collection process is widely applied due to simple flow, short design and construction period and economic investment. The moisture gathering and transporting system generally contains saturated vapor and some H from a well head to a gas gathering station or a purification station2S and CO2And the like. With the change of temperature, pressure and topography along the pipeline, condensate water is gradually separated out in the pipeline, and when gas-liquid two-phase flow is mixed and transported, liquid-phase water is deposited in the pipeline. The pipeline conveying pressure loss is increased, the pipeline conveying efficiency is reduced, the back pressure of the gas well is increased, and the release of the gas well capacity is influenced; under certain pressure and temperature conditions, the formation of hydrate can be accelerated, and ice blockage accidents are easy to cause; under certain terrain conditions, slug flow can be induced, and the safety risk is high; if the transport gas is high in H content2S and CO2In the case of acid gases, the presence of liquid accumulation can also lead to increased corrosion of the pipeline and increased leakage risk. Therefore, the pipeline is required to be diagnosed and analyzed at the point where liquid accumulation is easy to generate, and the generation of the local liquid accumulation of the pipeline is avoided by proper measures, so that the pipeline conveying efficiency is longThe period is kept at a higher level, and the safe production of the gas field is ensured.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a technical method for diagnosing and identifying the pipeline accumulated liquid, which can accurately determine the position of the pipeline accumulated liquid.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a technical method for diagnosing and identifying accumulated liquid in a pipeline comprises the following steps:
(1) drawing a pipeline along-the-way elevation point change map, and formulating pipeline along-the-way elevation difference information;
(2) identifying the gradient of the pipeline along the way by using a pipeline along-way elevation point change diagram, and obtaining a critical liquid carrying flow rate by using a pipeline critical liquid carrying flow rate/flow calculation formula;
(3) simulating actual operation parameters by using simulation software, establishing a ground gathering and transportation system model according to the geographical information, pipeline parameters and production parameters of the gathering and transportation system, and adjusting the coincidence degree of the model parameters and the production data to be more than 95%;
(4) according to the software simulation analysis result, comparing and analyzing the actual gas flow velocity and the critical liquid carrying flow velocity along the pipeline, and preliminarily identifying the position of the accumulated liquid generated by the pipeline; differentiating the pressure curve of the pipeline along the way according to the software simulation analysis result, establishing a pressure loss curve of the pipeline along the way in unit length, determining the maximum pressure loss point of the pipeline along the way, and accurately determining the position of accumulated liquid in the pipeline;
(5) reasonably determining the liquid accumulation amount in the pipeline by adopting a gathering and transportation system model; and predicting the liquid discharge amount and the liquid discharge interval time of the pipeline by using a pigging model.
Furthermore, in the step (1), according to the construction drawing of the established pipe network, the fluctuation points and the corresponding mileage of each pipeline are counted, the difference between the elevations and the mileage of two adjacent fluctuation points is calculated, and the elevation change, the corresponding length and the pipeline gradient condition of each section of each pipeline are calculated.
Further, in the step (2), a preliminary calculation is performed through a calculation formula of critical liquid carrying flow velocity/flow of the pipeline, and the calculation formula is as follows:
in the formula: vg-critical liquid-carrying flow velocity, m/s, of the upper inclined section; rhoLDensity of liquid in the line, kg/m3；ρgGas density in the line, kg/m3(ii) a σ -surface tension of the liquid in the line, N/m; theta-the angle between the pipeline and the horizontal plane, °.
Further, in the step (3), the gathering and transportation system geographic information refers to that the pipeline geographic information along the way is input according to the elevation point change map; the pipeline parameters refer to the inner diameter, the material, the heat transfer coefficient and the like of the pipeline; the production parameters refer to production data such as pipeline gas source gas composition, temperature, flow rate, pressure and the like.
Further, the key parameters of the ground gathering and transportation system model are defined as follows: selecting an SRK equation with respect to a thermodynamic approach; selecting a Beggs & Brill equation when the angle of the multiphase flow inclined upwards by the pressure drop calculation model is 10-70 degrees, selecting a Mukherjee-Brill equation when the angle of the multiphase flow inclined downwards is-10-70 degrees, and selecting a Beggs & Brill-Moody equation when the angle of the horizontal multiphase flow is-10 degrees; after the model calculation operation is converged, the conveying efficiency parameter of the pipeline is adjusted, the pipeline back pressure is ensured to be compared with the actual output pressure, and the output pressure goodness of fit is more than 95%.
Further, in the step (4), when the actual flow rate of the gas along the pipeline is lower than or close to the critical liquid carrying flow rate, liquid accumulation is easily generated in the corresponding pipeline section gathering and transportation system.
Further, the specific process of the step (5) is as follows: on the basis of pipeline simulation analysis, drawing a pipeline on-way liquid accumulation curve according to the accumulated liquid amount in the pipeline in the gathering and transportation model analysis result; the volume of liquid in the pipe section governed by the high points on the two sides of the liquid accumulation point of the pipeline is the corresponding liquid discharge amount of the low point, and the predicted liquid discharge amount of the low point is obtained through analysis according to the difference value of the liquid accumulation amounts of the two high points on the curve of the liquid accumulation amount along the pipeline; and a pipe cleaning module of the software is utilized to simulate the analysis of the pipe cleaning process of the pipeline again, and the pipe cleaning and drainage process replaces the low-point condensation discharge process of the pipeline. And taking the simulation analysis result of the time required for reestablishing the steady state in the pigging model as a prediction time interval point of the next liquid drainage after the first liquid drainage. And determining the hauling period of the tank truck according to the geographical environment of the liquid discharge point, dividing the hauling period by the time required for reestablishing the steady state, and multiplying the time by the primary low-point liquid discharge quantity to obtain the volume size of the low-point liquid discharge tank.
Compared with the prior art, the invention has the following advantages: the invention adopts gathering and transportation simulation software to carry out modeling analysis on the gathering and transportation pipe network, and simultaneously adopts the first derivative to carry out diagnosis analysis on the on-way pressure loss of the pipeline, thereby improving the accuracy of identifying the accumulated liquid points of the pipeline.
Drawings
FIG. 1 is a diagram of the variation in pipeline strike elevation according to the present invention;
FIG. 2 is a graph of pressure loss per unit length of the pipeline according to the present invention;
FIG. 3 is a graph of the amount of liquid accumulated in the pipeline according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention.
Example 1:
the technical method for diagnosing and identifying the accumulated liquid in the pipeline comprises the following steps:
(1) drawing a pipeline along-the-way elevation point change map, and formulating pipeline along-the-way elevation difference information;
specifically, according to a construction drawing of an established pipe network, fluctuation points and corresponding pipe mileage of each pipe line are counted, difference calculation is carried out on the elevations and the mileage of two adjacent fluctuation points, the elevation change and the corresponding length condition of each section of each pipe line are calculated, the point with the prominent elevation change is focused on, liquid accumulation is easy to generate, the counting result of the condition of each pipe section is shown in an attached drawing 1, and the point with the prominent elevation change and easy liquid accumulation is shown in the position where a circle is drawn in the attached drawing 1 and the corresponding mileage.
(2) Identifying the gradient of the pipeline along the way by using a pipeline along-way elevation point change diagram, and obtaining a critical liquid carrying flow rate by using a pipeline critical liquid carrying flow rate/flow calculation formula;
specifically, the preliminary calculation is carried out through the pipeline critical liquid carrying flow velocity/flow calculation formula, which is as follows:
in the formula: vg-critical liquid-carrying flow velocity, m/s, of the upper inclined section; rhoLDensity of liquid in the line, kg/m3；ρgGas density in the line, kg/m3(ii) a σ -surface tension of the liquid in the line, N/m; theta-the angle between the pipeline and the horizontal plane, °.
(3) Simulating actual operation parameters by using simulation software, establishing a ground gathering and transportation system model according to the geographical information, pipeline parameters and production parameters of the gathering and transportation system, adjusting the goodness of fit between the model parameters and the production data to be more than 95%, and analyzing to obtain the actual gas flow velocity along the pipeline;
specifically, Pipepase simulation software is adopted, and information required to be input by the simulation software comprises pipeline parameters, production parameters and the like; the production parameters comprise production data such as gas components, temperature, flow, pressure and the like of the pipeline, the pipeline parameters comprise the inner diameter, material, heat transfer coefficient and the like of the pipeline, and the geographical information of the gathering and transportation system is input according to a variation diagram of elevation points; selecting an SRK equation with respect to a thermodynamic approach; selecting a Beggs & Brill equation when the angle of the multiphase flow inclined upwards by the pressure drop calculation model is 10-70 degrees, selecting a Mukherjee-Brill equation when the angle of the multiphase flow inclined downwards is-10-70 degrees, and selecting a Beggs & Brill-Moody equation when the angle of the horizontal multiphase flow is-10 degrees; and simulating by using a software model, calculating the back pressure of the pipeline, adjusting parameters such as the conveying efficiency eta and the pipe wall roughness of each pipe section according to the calculation result, and ensuring that the back pressure of the pipeline is compared with the external output pressure of actual production to meet the requirement that the external output pressure goodness of fit is more than 95%.
(4) According to the software simulation analysis result, comparing and analyzing the actual gas flow speed and the critical liquid carrying flow speed along the pipeline, preliminarily identifying the position of the pipeline, which is likely to generate the accumulated liquid, and easily generating the accumulated liquid by the gathering and transportation system when the actual gas flow speed along the pipeline is lower than or close to the critical liquid carrying flow speed; differentiating the pressure curve of the pipeline along the way according to the software simulation analysis result, analyzing and obtaining a pressure loss curve graph of the pipeline along the way in unit length, accurately positioning and identifying a local resistance loss high point in the graph, namely a pipeline liquid accumulation point, and accurately determining the position of the pipeline liquid accumulation; the calculation analysis result is shown in fig. 2, and the points marked by circles in the graph are the diagnosed effusion points.
(5) Reasonably determining the liquid accumulation amount in the pipeline by adopting a gathering and transportation system model; the pipeline pipe cleaning model in the software is utilized, a pipeline on-way liquid accumulation curve is obtained through simulation analysis, and the low-point liquid accumulation amount and the liquid drainage interval time of the pipeline are reasonably determined.
Specifically, on the basis of pipeline simulation analysis, a curve of the accumulated liquid volume along the pipeline is drawn according to the accumulated liquid volume in the pipeline in the analysis result of the gathering and transportation model, and the simulation result is shown in fig. 3; the pipeline governed by the high points on the two sides of the pipeline liquid loading point is the corresponding liquid loading liquid discharge amount in the pipeline of the low point, and the predicted liquid discharge amount of the low point is obtained through analysis by the difference value of the liquid loading amounts of the two high points on the pipeline liquid loading amount curve. And a pipe cleaning module of the software is utilized to simulate the analysis of the pipe cleaning process of the pipeline again, and the pipe cleaning and drainage process replaces the low-point condensation discharge process of the pipeline. And taking the simulation analysis result of the time required for reestablishing the steady state in the pigging model as a prediction time interval point of the next liquid drainage after the first liquid drainage.
The accumulated liquid points of the pipeline can be accurately positioned through the analysis process, and low-point accumulated liquid amount and liquid discharge interval time are obtained through analysis, so that basic data are provided for design. According to the technical method, a clinical block dense gas field technology pipe network of a Zhongjiu coal bed gas layer limited liability company, Jinxi division, identifies 4 severe liquid accumulation points, and implements 2 points according to the geographical environment of the site. After the engineering application, the output pressure of the pipeline is reduced by 3atm, the conveying efficiency of the pipeline is improved, and the yield of the gas well is improved.
The above embodiments are only specific examples of the present invention, and the protection scope of the present invention includes but is not limited to the product forms and styles of the above embodiments, and any suitable changes or modifications made by those skilled in the art according to the claims of the present invention shall fall within the protection scope of the present invention.
Claims (7)
1. A technical method for diagnosing and identifying accumulated liquid in a pipeline is characterized by comprising the following steps: the method comprises the following steps:
(1) drawing a pipeline along-the-way elevation point change map, and formulating pipeline along-the-way elevation difference information;
(2) identifying the gradient of the pipeline along the way by using a pipeline along-way elevation point change diagram, and obtaining a critical liquid carrying flow rate by using a pipeline critical liquid carrying flow rate/flow calculation formula;
(3) simulating actual operation parameters by using simulation software, establishing a ground gathering and transportation system model according to the geographical information, pipeline parameters and production parameters of the gathering and transportation system, and adjusting the coincidence degree of the model parameters and the production data to be more than 95%;
(4) according to the software simulation analysis result, comparing and analyzing the actual gas flow velocity and the critical liquid carrying flow velocity along the pipeline, and preliminarily identifying the position of the accumulated liquid generated by the pipeline; differentiating the pressure curve of the pipeline along the way according to the software simulation analysis result, establishing a pressure loss curve of the pipeline along the way in unit length, determining the maximum pressure loss point of the pipeline along the way, and accurately determining the position of accumulated liquid in the pipeline;
(5) reasonably determining the liquid accumulation amount in the pipeline by adopting a gathering and transportation system model; and predicting the liquid discharge amount and the liquid discharge interval time of the pipeline by using a pigging model.
2. The technical method for diagnosing and identifying the accumulated liquid in the pipeline according to claim 1, wherein the technical method comprises the following steps: in the step (1), according to a construction drawing of the established pipe network, the fluctuation points and the corresponding pipe mileage of each pipe are counted, the difference between the elevations and the mileage of two adjacent fluctuation points is calculated, and the elevation change, the corresponding length and the pipe gradient condition of each section of each pipe are calculated.
3. The technical method for diagnosing and identifying the accumulated liquid in the pipeline according to claim 1, wherein the technical method comprises the following steps: in the step (2), preliminary calculation is carried out through a pipeline critical liquid carrying flow velocity/flow calculation formula, wherein the calculation formula is as follows:
in the formula: vg-critical liquid-carrying flow velocity, m/s, of the upper inclined section; rhoLDensity of liquid in the line, kg/m3；ρgGas density in the line, kg/m3(ii) a σ -surface tension of the liquid in the line, N/m; theta-the angle between the pipeline and the horizontal plane, °.
4. The technical method for diagnosing and identifying the accumulated liquid in the pipeline according to claim 1, wherein the technical method comprises the following steps: in the step (3), the geographical information of the gathering and transportation system is input according to the elevation point change diagram, and the pipeline parameters refer to the inner diameter, the material and the heat transfer coefficient of the pipeline; the production parameters refer to pipeline gas source gas composition, temperature, flow rate and pressure.
5. The technical method for diagnosing and identifying the accumulated liquid in the pipeline according to claim 1, wherein the technical method comprises the following steps: the ground gathering and transportation system model key parameter definition comprises the following steps: selecting an SRK equation with respect to a thermodynamic approach; selecting a Beggs & Brill equation when the angle of the multiphase flow inclined upwards by the pressure drop calculation model is 10-70 degrees, selecting a Mukherjee-Brill equation when the angle of the multiphase flow inclined downwards is-10-70 degrees, and selecting a Beggs & Brill-Moody equation when the angle of the horizontal multiphase flow is-10 degrees; after the model calculation operation is converged, the conveying efficiency parameter of the pipeline is adjusted, the pipeline back pressure is ensured to be compared with the actual output pressure, and the output pressure goodness of fit is more than 95%.
6. The technical method for diagnosing and identifying the accumulated liquid in the pipeline according to claim 1, wherein the technical method comprises the following steps: in the step (4), when the actual flow rate of the gas along the pipeline is lower than or close to the critical liquid carrying flow rate, the corresponding pipeline section gathering and transportation system is easy to generate liquid accumulation.
7. The technical method for diagnosing and identifying the accumulated liquid in the pipeline according to claim 1, wherein the technical method comprises the following steps: the specific process of the step (5) is as follows: on the basis of pipeline simulation analysis, drawing a pipeline on-way liquid accumulation curve according to the accumulated liquid amount in the pipeline in the gathering and transportation model analysis result; the volume of liquid in the pipe section governed by the high points on the two sides of the liquid accumulation point of the pipeline is the corresponding liquid discharge amount of the low point, and the predicted liquid discharge amount of the low point is obtained through analysis according to the difference value of the liquid accumulation amounts of the two high points on the curve of the liquid accumulation amount along the pipeline; a pipe cleaning module of the software is utilized to simulate the analysis of the pipe cleaning process of the pipeline again, and the pipe cleaning and drainage process of the pipeline replaces the low-point drainage and condensation process of the pipeline; and taking the simulation analysis result of the time required for reestablishing the steady state in the pigging model as a prediction time interval point of the next liquid drainage after the first liquid drainage.
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Application publication date: 20201027 |