Pour point and gel properties
Pour point and gel properties
(OP)
As far as i understand a crude will form a stable gel when cooled below its pour point. I guess the name indicates that it "cant be poured". However: How stable is this gel? Can it still be moved in a pipeline if the differential pressure becomes large enough - or could a situation like plugging with hydrates occur?
Best regards
Morten
Best regards
Morten





RE: Pour point and gel properties
If you go under the pour point the value of needed differential pressure will be huge. The source of your problems it will be the interfacial tension beetwen fluid and pipeline.
Interfacial Tension (IFT) is a measurement of the cohesive (excess) energy present at an interface arising from the imbalance of forces between molecules at an interface (gas/liquid, liquid/liquid, gas/solid, liquid/solid). It can be quantified as the force acting normal to the interface per unit length (force/unit length, mN/m).When two different phases (gas/liquid, liquid/liquid, gas/solid or liquid/solid) are in contact with each other the molecules at the interface experience an imbalance of forces. This will lead to an accumulation of free energy at the interface.
The excess energy is called surface free energy and can be quantified as a measurement of energy/area i.e. the energy required to increase the surface area of the interface by a unit amount. It is also possible to describe this situation as having a line tension or interfacial tension (IFT), which is quantified as a force/length measurement. This force tends to minimize the area of the surface, thus explaining why for example liquid drops and air bubbles are round. The common units for interfacial tension (IFT) are dynes/cm or mN/m. These units are equivalent.
This excess energy exists at any interface. If one of the phases is the gas phase of a liquid being tested the measurement is normally referred to as Surface Tension (ST). If the surface investigated is the interface of two immiscible liquids the measurement is normally referred to as interfacial tension (IFT). In either case the more dense fluid is referred to herein as the "heavy phase" and the less dense fluid is referred to as the "light phase". Solid surfaces also may be described to have an interfacial tension normally referred to as Surface Free Energy (SFE), but direct measurement of its value is not possible through techniques used for liquids.
A.
Best regards,
Andrei
RE: Pour point and gel properties
RE: Pour point and gel properties
I think that link will solve your problems:
http://www.bhrgroup.co.uk/confsite/hyd2home.htm
Contact me if you have reservoir related question.
A.
Best regards,
Andrei
RE: Pour point and gel properties
search on IFP articles
http
for that one: "Experimental Study of the Pipeline Lubrication for Heavy Oil Transport"
Best regards,
Andrei
RE: Pour point and gel properties
Best regards
Morten
RE: Pour point and gel properties
Thank you for you help.
Best regrads
Morten