Rheological Property of Waxy Crude Oil in Restart Process of Pipeline

2010 ◽  
Author(s):  
Yanbo Xu ◽  
Qiyu Huang
Keyword(s):  
Rheological Property ◽  
Crude Oil ◽  
Rheological Properties ◽  
Yield Stress ◽  
Outlet Temperature ◽  
Waxy Crude Oil ◽  
Time Duration ◽  
Waxy Crude

In the restart process of pipeline containing waxy crude oil after shutdown, the rheological properties of oil, including viscosity, yield stress and thixotropy is studied. The entire restart process is decided by various factors; in this paper the effects of outlet temperature, shutdown and restart temperature as well as shutdown time duration to the rheological property are taken into the consideration. The measurements are employed using a controlled shearing rheometer to investigate rheological property based on different restart conditions. In addition, this paper has also researched affection of emulsion and blended samples mixing with two types of crude oil in various ratios. Finally comprehensive rheological evaluation to restartability is obtained.

Yield stress measurement of gelled waxy crude oil: Gap size requirement

2015 ◽  
Vol 218 ◽  
pp. 71-82 ◽  
Author(s):  
A. Japper-Jaafar ◽  
P.T. Bhaskoro ◽  
L.L. Sean ◽  
M.Z. Sariman ◽  
H. Nugroho
Keyword(s):  
Crude Oil ◽  
Yield Stress ◽  
Stress Measurement ◽  
Gap Size ◽  
Waxy Crude Oil ◽  
Waxy Crude

scholarly journals Study on Optimizing Operation of Preheating Commissioning for Waxy Crude Oil Pipelines

2014 ◽  
Vol 6 ◽  
pp. 894256
Author(s):  
Jian Zhang ◽  
Yi Wang ◽  
Xinran Wang ◽  
Handu Dong ◽  
Jinping Huang ◽  
...  
Keyword(s):  
Crude Oil ◽  
Outlet Temperature ◽  
Fluid Temperature ◽  
Governing Equations ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Oil Pipeline ◽  
Single Station ◽  
Oil Pipelines ◽  
Volume Method

A mathematical model is established for the preheating commissioning process of waxy crude oil pipelines. The governing equations are solved by the finite volume method and the finite difference method. Accordingly, numerical computations are made for the Niger crude oil pipeline and the Daqing-Tieling 3rd pipeline. The computational results agree well with the field test data. On this basis, fluid temperature in the process of the preheating commissioning is studied for single station-to-station pipeline. By comparing different preheating modes, it is found that the effect of forward preheating is the best. Under different preheating commissioning conditions, the optimal combination of outlet temperature and flow rate is given.

scholarly journals Unavoidable Destroyed Exergy in Crude Oil Pipelines due to Wax Precipitation

Entropy ◽  
2019 ◽  
Vol 21 (1) ◽  
pp. 58
Author(s):  
Qinglin Cheng ◽  
JinWei Yang ◽  
Anbo Zheng ◽  
Lu Yang ◽  
Yifan Gan ◽  
...  
Keyword(s):  
Crude Oil ◽  
Design Parameters ◽  
Burial Depth ◽  
Outlet Temperature ◽  
Waxy Crude Oil ◽  
Wax Precipitation ◽  
Waxy Crude ◽  
Oil Pipeline ◽  
Oil Pipelines ◽  
Operation Parameters

Based on the technological requirements related to waxy crude oil pipeline transportation, both unavoidable and avoidable destroyed exergy are defined. Considering the changing characteristics of flow pattern and flow regime over the course of the oil transportation process, a method of dividing station oil pipelines into transportation intervals is suggested according to characteristic temperatures, such as the wax precipitation point and abnormal point. The critical transition temperature and the specific heat capacity of waxy crude oil are calculated, and an unavoidable destroyed exergy formula is derived. Then, taking the Daqing oil pipeline as an example, unavoidable destroyed exergy in various transportation intervals are calculated during the actual processes. Furthermore, the influential rules under various design and operation parameters are further analyzed. The maximum and minimum unavoidable destroyed exergy are 381.128 kJ/s and 30.259 kJ/s. When the design parameters are simulated, and the maximum unavoidable destroyed exergy is 625 kJ/s at the diameter about 250 mm. With the increase of insulation layer thickness, the unavoidable destroyed exergy decreases continuously, and the minimum unavoidable destroyed exergy is 22 kJ/s at 30 mm. And the burial depth has little effect on the unavoidable destroyed exergy. When the operation parameters are simulated, the destroyed exergy increases, but it is less affected by the outlet pressure. The increase amplitude of unavoidable destroyed exergy will not exceed 2% after the throughput rises to 80 m3/h. When the outlet temperature increases until 65 °C, the loss increase range will not exceed 4%. Thus, this study provides a theoretical basis for the safe and economical transportation of waxy crude oil.

scholarly journals Studying the rheological properties and the influence of drag reduction on a waxy crude oil in pipeline flow

2016 ◽  
Vol 25 (1) ◽  
pp. 39-44 ◽  
Author(s):  
M.H. Hassanean ◽  
M.E. Awad ◽  
H. Marwan ◽  
A.A. Bhran ◽  
M. Kaoud
Keyword(s):  
Drag Reduction ◽  
Crude Oil ◽  
Rheological Properties ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Pipeline Flow

scholarly journals Yield Stress Measurements of Waxy Crude Oil

2014 ◽  
Vol 14 (11) ◽  
pp. 1114-1122 ◽  
Author(s):  
Jaspreet Kaur ◽  
Azuraien Jaafar
Keyword(s):  
Crude Oil ◽  
Yield Stress ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Stress Measurements

scholarly journals A comprehensive constitutive law for waxy crude oil: a thixotropic yield stress fluid

Soft Matter ◽  
2014 ◽  
Vol 10 (35) ◽  
pp. 6619-6644 ◽  
Author(s):  
Christopher J. Dimitriou ◽  
Gareth H. McKinley
Keyword(s):  
Constitutive Model ◽  
Crude Oil ◽  
Yield Stress ◽  
Constitutive Law ◽  
Waxy Crude Oil ◽  
Waxy Crude ◽  
Yield Stress Fluid ◽  
Rheological Response

A constitutive model is developed that predicts the rheological response of waxy crude oil to a number of different flows.

Effect of wax inhibitors on pour point and rheological properties of Iranian waxy crude oil

2008 ◽  
Vol 89 (10) ◽  
pp. 973-977 ◽  
Author(s):  
Jafari Behbahani Taraneh ◽  
Golpasha Rahmatollah ◽  
Akbarnia Hassan ◽  
Dahaghin Alireza
Keyword(s):  
Crude Oil ◽  
Rheological Properties ◽  
Pour Point ◽  
Waxy Crude Oil ◽  
Waxy Crude
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