Establishment and Verification of the Wall Sticking Occurrence Temperature Calculation Model of Stratified Flow Pipeline

doi:10.11885/j.issn.1674-5086.2022.11.03.02

Abstract

Abstract: Low temperature transportation technology can effectively reduce energy and economic loss for high-water-cut gathering and transportation pipelines. However, with the popularization of gas flooding, the fluids in many gathering pipelines are in the state of three-phase of oil, gas and water. In order to explore the effect of gas on the adhesion of gelled oil on the wall, a self-developed pressure-bearing stirring tank is used to measure the adhesion mass of gelled oil on the wall under different conditions. It is found that the gas dissolved in crude oil can significantly reduce the adhesion of gelled oil, while the temperature does not change with corresponding mass surge; subsequently, a gas injection test is carried out on the high water-cut gathering and transportation pipeline on site, and it shows that with the increase of the gas-oil ratio in the pipeline, the minimum inlet temperature decreases from 29 ℃ to 26 ℃, indicating that the presence of gas improves the fluidity of crude oil; finally, based on the theoretical basis of " wall shear stress=yield stress × coefficient", a stick-wall temperature calculation model that can be used in stratified flow gathering and transportation pipelines is established, and the verification shows that the model has a good calculation effect.

Key words: crude oil with dissolved gas, low temperature gathering and transportation, wall sticking occurrence temperature, gas injection test, stratified flow

CLC Number:

TE832

CHENG Xianwen, XIONG Jianhua, HUANG Qiyu, TIAN Jiaxing, YU Le. Establishment and Verification of the Wall Sticking Occurrence Temperature Calculation Model of Stratified Flow Pipeline[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2025, 47(2): 137-150.

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