CN-122020938-A - Method, device and application for determining pipe cleaning period of coalbed methane gas collecting pipeline

CN122020938ACN 122020938 ACN122020938 ACN 122020938ACN-122020938-A

Abstract

The application relates to a method for determining a tube cleaning period of a coal bed gas collecting pipeline, which comprises the steps of obtaining historical data of production parameters of a starting point gas collecting station and an ending point gas collecting station, and operation data and comprehensive cost of the production parameters in the operation process of the gas collecting pipeline, determining a relation between the tube cleaning period and external delivery pressure according to the historical data and the operation data of the production parameters, wherein the production parameters comprise the tube cleaning period, the external delivery pressure and the liquid accumulation amount, modeling based on the liquid accumulation amount and the data of the tube cleaning period, determining the relation between the tube cleaning period and the liquid accumulation amount, obtaining comprehensive cost data in the operation process of the gas collecting pipeline, determining the relation between the tube cleaning period and the comprehensive cost based on the comprehensive cost data and the data of the tube cleaning period, and determining boundary conditions according to the external delivery pressure, the liquid accumulation amount and the comprehensive cost, and calculating to obtain an optimal solution of the tube cleaning period.

Inventors

QU LIBIN
WU CHUNSHENG
MENG FANHUA
LIU SONGQUN
WANG ZIHUI
Chen Jubiao
GUO BINGYAN

Assignees

中国石油天然气股份有限公司

Dates

Publication Date: 20260512
Application Date: 20241112

Claims (10)

1. A method for determining a cleaning cycle of a coalbed methane gas collecting pipeline, comprising: Acquiring historical data of production parameters of a starting gas collecting station and an ending gas collecting station, and operation data and comprehensive cost of the production parameters in the operation process of a gas collecting pipeline, and determining a relation between a pipe cleaning period and an external delivery pressure according to the historical data and the operation data of the production parameters, wherein the production parameters comprise the pipe cleaning period, the external delivery pressure and the accumulated liquid amount; Modeling based on the accumulated liquid amount and the data of the pipe cleaning period, and determining the relation between the pipe cleaning period and the accumulated liquid amount; acquiring comprehensive cost data in the running process of the gas collecting pipeline, and determining the relation between the pipe cleaning period and the comprehensive cost based on the comprehensive cost data and the data of the pipe cleaning period; and determining boundary conditions according to the output pressure, the liquid accumulation amount and the comprehensive cost, and calculating to obtain an optimal solution of the pipe cleaning period.
2. A method of determining a pigging period of a coalbed methane header pipe according to claim 1, wherein said determining a relationship between pigging period and export pressure from said historical data and said operational data of said production parameters comprises: drawing a scatter diagram according to the historical data, the pigging period data and the output pressure data in the operation data; And performing linear regression based on the scatter diagram to obtain the relation between the cleaning cycle and the output pressure.
3. The method of claim 1, wherein modeling based on the data of the liquid accumulation volume and the liquid accumulation volume, and determining the relationship between the liquid accumulation volume and the liquid accumulation volume comprises simulating the liquid accumulation volume in the gas accumulation pipeline by using simulation calculation software to obtain the relationship between the liquid accumulation volume and the liquid accumulation volume without performing a cleaning operation.
4. A method for determining a pigging period of a coalbed methane gas header pipeline according to claim 2 or 3, The relation between the pipe cleaning period and the output pressure is a linear positive correlation; The relationship between the cleaning cycle and the liquid accumulation amount is a linear positive correlation.
5. The method of claim 1, wherein the composite cost comprises a consumable cost and an electrical energy cost, and wherein determining the relationship between the pigging period and the composite cost based on the composite cost data and the pigging period data comprises: Based on the consumable cost, the electrical energy cost, and the data of the pig cycle, a relationship between the pig cycle and the consumable, and a relationship between the pig cycle and the electrical energy are determined.
6. The method for determining a cleaning cycle of a coalbed methane gas header pipeline according to claim 5, The relation between the pipe cleaning period and the consumable is an inverse function relation, and the relation between the pipe cleaning period and the electric energy is a positive correlation relation on the premise that the inlet pressure of the gas gathering station is constant.
7. The method of claim 1, wherein determining boundary conditions based on the output pressure, the liquid accumulation, and the composite cost comprises: determining a functional relation f (T, delta P) between the pipe cleaning period and the output pressure, taking f (delta P is less than or equal to delta P max ) as an output pressure boundary condition, wherein delta P represents the maximum pressure drop allowed by a pipeline, delta P max represents the outlet pressure bearable by an upstream gas collecting station, and T represents the pipe cleaning period; Determining a functional relation f (T, Q) of the cleaning period and the accumulated liquid, and taking Q Water and its preparation method ≤Q Underwater swimming as a boundary condition of the accumulated liquid, wherein Q Water and its preparation method represents the accumulated liquid, Q Underwater swimming represents the maximum water amount which can be born by a downstream gas collecting station, and T represents the cleaning period; The composite cost minimum is determined as a cost boundary condition.
8. The method of claim 7, wherein the determining the boundary condition according to the output pressure, the accumulated liquid volume and the comprehensive cost, calculating the optimal solution for the cleaning cycle comprises simultaneously solving, determining the optimal solution for the cleaning cycle as Tmin, Wherein tmin=min { T 1 ,T 2 ,T 3 }, f (P) represents the output pressure boundary condition, f (Q) represents the liquid accumulation volume boundary condition, f (E) represents the cost boundary condition, T 1 represents a solution for calculating a pigging period from the output pressure boundary condition, T 2 represents a solution for calculating a pigging period from the liquid accumulation volume boundary condition, and T 3 represents a solution for calculating a pigging period from the cost boundary condition.
9. A device for determining a cleaning cycle of a coalbed methane gas collecting pipeline, comprising: The system comprises a first module, a second module, a third module, a fourth module, a fifth module, a sixth module and a seventh module, wherein the first module is used for acquiring historical data of production parameters of a starting gas collecting station and an ending gas collecting station, and operation data and comprehensive cost of the production parameters in the operation process of a gas collecting pipeline, and determining the relation between a pipe cleaning period and an output pressure according to the historical data and the operation data of the production parameters, wherein the production parameters comprise the pipe cleaning period, the output pressure and the accumulated liquid; a second module for modeling based on the liquid accumulation volume and the data of the pig cycle, determining a relationship between the pig cycle and the liquid accumulation volume; The third module is used for acquiring comprehensive cost data in the running process of the gas collecting pipeline and determining the relation between the pipe cleaning period and the comprehensive cost based on the comprehensive cost data and the data of the pipe cleaning period; and the fourth module is used for determining boundary conditions according to the output pressure, the accumulated liquid amount and the comprehensive cost and calculating to obtain the optimal solution of the pipe cleaning period.
10. The application of the method for determining the cleaning cycle of the coal bed gas collecting pipeline is characterized by comprising the steps of determining the cleaning cycle of the collecting pipeline to be operated according to the method for determining the cleaning cycle of the coal bed gas collecting pipeline according to any one of claims 1 to 9, and performing cleaning operation according to the cleaning cycle.

Description

Method, device and application for determining pipe cleaning period of coalbed methane gas collecting pipeline Technical Field The application relates to the technical field of coalbed methane gathering and transportation, in particular to a method, a device and application for determining a tube cleaning period of a coalbed methane collecting pipeline. Background Coal bed gas resources are often distributed in mountainous and hilly areas, the gas collecting pipelines in the gas fields are fluctuant, and along with the decrease of the temperature and the pressure along the pipelines, water vapor is gradually separated out to be liquid water which is accumulated in the low-lying parts of the pipelines or is attached to the pipe walls in the form of liquid drops. Along with the passage of the operation time of the pipeline, the accumulated water amount gradually becomes larger, so that the friction resistance of the pipeline is gradually increased, the pressure loss is accelerated, and a series of problems of reduced pipeline conveying efficiency, corrosion perforation and the like are caused. Therefore, the pipeline needs to be periodically pigged to ensure efficient transportation of the coalbed methane gas collecting pipeline. However, in actual pigging operation, if the pigging operation period is set to be shorter, the operation is too frequent, which causes unnecessary waste of manpower, material resources, financial resources and the like, and if the pigging operation period is set to be longer, the pigging effect cannot be ensured, which causes great potential safety hazard for system operation. Therefore, how to obtain a reasonable pipe cleaning period to realize the efficient and stable operation of the coalbed methane gas collecting pipeline and reduce the operation safety risk of the system is a problem to be solved urgently. Disclosure of Invention The application provides a method for determining the pipe cleaning period of a coal bed gas collecting pipeline, which is used for realizing the efficient and stable operation of the coal bed gas collecting pipeline and reducing the operation safety risk of a system. The application provides a method for determining a tube cleaning period of a coal bed gas collecting tube, which comprises the steps of obtaining historical data of production parameters of a starting gas collecting station and an ending gas collecting station, and operation data and comprehensive cost of the production parameters in the operation process of the gas collecting tube, determining a relation between the tube cleaning period and an output pressure according to the historical data and the operation data of the production parameters, wherein the production parameters comprise the tube cleaning period, the output pressure and the liquid accumulation amount, modeling based on the liquid accumulation amount and the data of the tube cleaning period, determining the relation between the tube cleaning period and the liquid accumulation amount, obtaining comprehensive cost data in the operation process of the gas collecting tube, determining the relation between the tube cleaning period and the comprehensive cost based on the comprehensive cost data and the data of the tube cleaning period, determining a boundary condition according to the output pressure, the liquid accumulation amount and the comprehensive cost, and calculating to obtain a period optimal solution. As an alternative implementation mode, the determining the relation between the pipe cleaning period and the output pressure according to the historical data and the operation data of the production parameters comprises the steps of drawing a scatter diagram according to the pipe cleaning period data and the output pressure data in the historical data and the operation data, and carrying out linear regression based on the scatter diagram to obtain the relation between the pipe cleaning period and the output pressure. As an alternative implementation mode, the modeling based on the accumulated liquid volume and the data of the pipe cleaning period is used for determining the relation between the pipe cleaning period and the accumulated liquid volume, and the relation between the pipe cleaning period and the accumulated liquid volume is obtained by simulating the accumulated liquid in a gas collecting pipeline through simulation calculation software on the premise that pipe cleaning operation is not carried out. As an alternative embodiment, the relation between the cleaning cycle and the output pressure is a linear positive correlation, and the relation between the cleaning cycle and the accumulated liquid amount is a linear positive correlation. As an alternative embodiment, the integrated cost comprises a consumable cost and an electrical energy cost, and the determining the relationship between the pig period and the integrated cost based on the integrated cost data and the pig period data comprises determining the rela