Mousumi Ghosh
Petroleum
- Apr 19, 2018
- 5
Hello:
I have a question regarding fluid flow and the change in viscosity of the fluid flow as the field parameter changes from one step to another.
How does one activate viscosity change, in gap flow, as the dependency (field variable) is specified at a particular node in Abaqus Standard?
I am modelling fluid flow, followed by fluid and proppant flow inside a cohesive fracture. In step 2, I just pump in normal fluid (that has low viscosity of 1 cP) and at the beginning of step 3, I am assigning to a particular node a field variable number so that the viscosity of the fluid will change from 1 cP to 3cP at the start of step 3. Thus, what I am doing is the following:
Under *Gap Flow keyword,
I am entering the following lines:
Under *Step keyword (when it is step 3),
I am entering the following line:
"Part-1-1.inlet_Node" is the node where I am injecting the fluid, using the command *cflow at the beginning of step 2.
When step 3 will start, I want Abaqus to change the fluid viscosity because I am introducing the field variable at this node. Basically, I am trying to tell Abaqus that I am injecting fluid with proppants mixed with them at the beginning of Step 3, which will result in the higher pressure gradient across the fracture length!!!
But when I do this, for some reason, this change is not taking place! The pressure change, due to injecting viscous fluid, is not taking place!
Could you please help me with this? Maybe I am doing this wrong!
Thank you very much!
I have a question regarding fluid flow and the change in viscosity of the fluid flow as the field parameter changes from one step to another.
How does one activate viscosity change, in gap flow, as the dependency (field variable) is specified at a particular node in Abaqus Standard?
I am modelling fluid flow, followed by fluid and proppant flow inside a cohesive fracture. In step 2, I just pump in normal fluid (that has low viscosity of 1 cP) and at the beginning of step 3, I am assigning to a particular node a field variable number so that the viscosity of the fluid will change from 1 cP to 3cP at the start of step 3. Thus, what I am doing is the following:
Under *Gap Flow keyword,
I am entering the following lines:
Code:
*Gap Flow, dependencies=1
0.001, , 0.
0.00122408, , 0.05
0.00153288, , 0.1
0.00558678, , 0.3
0.0187778, , 0.4Under *Step keyword (when it is step 3),
I am entering the following line:
Code:
*FIELD, VARIABLE=1
Part-1-1.inlet_Node, 0.273"Part-1-1.inlet_Node" is the node where I am injecting the fluid, using the command *cflow at the beginning of step 2.
When step 3 will start, I want Abaqus to change the fluid viscosity because I am introducing the field variable at this node. Basically, I am trying to tell Abaqus that I am injecting fluid with proppants mixed with them at the beginning of Step 3, which will result in the higher pressure gradient across the fracture length!!!
But when I do this, for some reason, this change is not taking place! The pressure change, due to injecting viscous fluid, is not taking place!
Could you please help me with this? Maybe I am doing this wrong!
Thank you very much!