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Method for judging dense pigging of moisture gathering and transportation pipeline

A pipeline and pigging technology, which is applied in the direction of complex mathematical operations, etc., can solve the problems of complex calculation of pipeline liquid volume, no judgment of encrypted pigging, difficult operation, etc.

Active Publication Date: 2019-09-03
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the Patent No. 201310520090.2 "A Detection Method for Judging the Pigging Timing of Moisture Gathering and Transportation Pipeline Network", the calculation of the amount of liquid accumulation in the pipeline is relatively complicated, and the percentage of liquid accumulation in the pipeline and the volume of the pipe is used to judge the timing of pigging. There is no judgment on intensive pigging, and the judgment has not been quantified to a specific value. It is difficult to operate in practical applications and cannot adapt to the guidance of on-site pigging operations.

Method used

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  • Method for judging dense pigging of moisture gathering and transportation pipeline
  • Method for judging dense pigging of moisture gathering and transportation pipeline
  • Method for judging dense pigging of moisture gathering and transportation pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] according to figure 1 A method for judging dense pigging of wet gas gathering and transportation pipelines shown includes the following steps:

[0048] Step 1: Calculate the saturated water content of natural gas at the beginning and end of the pipeline

[0049] According to the pressure P of natural gas at the beginning of the pipeline 1 and the pipe start temperature T 1 The corresponding saturated vapor pressure P at the beginning of the pipeline sw1 , to calculate the water content q at the beginning of the pipeline 1 ;According to the pressure P of the natural gas at the end of the pipeline 2 and pipe end temperature T 2 The corresponding saturated vapor pressure at the end of the pipeline P sw2 , to calculate the water content q at the end of the pipeline 2 ;

[0050] Step 2: Obtain the value of pipeline effusion

[0051] According to the gas transmission volume, the time since the last pigging and the saturated water content of the natural gas at the beg...

Embodiment 2

[0062] according to figure 1 The shown method for judging the dense pigging of the wet gas gathering and transportation pipeline is different from the first embodiment in that the water content q at the beginning of the pipeline in the first step is 1 is through the formula

[0063]

[0064] calculated;

[0065] In the formula, q 1 —Water content of natural gas at the beginning of the pipeline, g / m 3 ;

[0066] P sw1 — Saturation vapor pressure at the beginning of the pipeline, MPa;

[0067] P 1 —Natural gas pressure at the beginning of the pipeline, MPa.

[0068] In actual application, the saturated vapor pressure P at the beginning of the pipeline sw1 According to the temperature at the beginning of the pipeline, the corresponding saturated vapor pressure Psw can be found from Table 1 1 value, P 1 It can be easily measured on site, therefore, in the present invention, the water content q at the beginning of the pipeline 1 Value acquisition is simple and easy to...

Embodiment 3

[0070] according to figure 1 The shown method for judging the dense pigging of the wet gas gathering and transportation pipeline is different from the first embodiment in that the water content q at the end of the pipeline in the first step is 2 is through the formula

[0071]

[0072] calculated;

[0073] In the formula, q 2 —Water content of natural gas at the end of the pipeline, g / m 3 ;

[0074] P sw2 — Saturation vapor pressure at the end of the pipeline, MPa;

[0075] P 2 —Natural gas pressure at the end of the pipeline, MPa.

[0076] In actual application, the saturated vapor pressure at the end of the pipeline P sw2 According to the temperature at the end of the pipeline, the saturated vapor pressure P at the corresponding end of the pipeline can be found from Table 1 sw2 value, P 1 It is convenient to obtain on site, therefore, the water content q at the end of the pipeline in the present invention 2 Value acquisition is simple and easy to operate.

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Abstract

The invention belongs to the technical field of gathering and transportation pipeline pigging, and particularly relates to a method for judging dense pigging of a moisture gathering and transportationpipeline. The method comprises the following four steps of calculating the saturated water content of the natural gas at a beginning end and an ending end of the pipeline; obtaining a pipeline effusion quantity value; obtaining the percentage of the pipeline effusion quantity and the pipe capacity volume; and judging whether the pipeline is encrypted or not. According to the method, the accumulated liquid condition of the moisture gathering and transportation pipeline can be simply and quickly predicted, and whether the pipeline needs to be subjected to the encrypted pipeline cleaning or notis quickly and conveniently judged according to the percentage of the accumulated liquid amount of the pipeline and the volume of the pipeline.

Description

technical field [0001] The invention belongs to the technical field of pipe pigging of gathering and transportation pipelines, and in particular relates to a method for judging the intensive pigging of wet gas gathering and transportation pipelines. Background technique [0002] The operation specification of natural gas pipeline stipulates that a reasonable pigging cycle should be determined according to the gas condition of the pipeline, the transmission efficiency of the pipeline and the transmission pressure difference. There is no specific parameter limit value for the pigging cycle in the specification. In practical application, in order to facilitate management and operation, generally, wet gas gathering and transportation pipelines must be pigged twice a year. For pipelines with a lot of liquid accumulation, intensive pigging must be implemented. The method is: sort out the pigging history of the pipeline. When the maximum liquid volume cleared from the pipeline is ...

Claims

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Application Information

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IPC IPC(8): G06F17/10
CPCG06F17/10
Inventor 王惠曾萍田发国赖海涛张春涛樊晨操红梅徐梅赞
Owner PETROCHINA CO LTD
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