Fatal Python error: Segmentation fault

[prasadkumar0590]

I tried to run the below code in ubuntu. but getting below error. Your help greatly appreciated.

import welleng as we
from tabulate import tabulate

construct simple well paths

print("Constructing wells...")
connector_reference = we.survey.from_connections(
we.connector.Connector(
pos1=[0., 0., 0.],
inc1=0.,
azi1=0.,
pos2=[-100., 0., 2000.],
inc2=90,
azi2=60,
),
step=50
)

connector_offset = we.survey.from_connections(
we.connector.Connector(
pos1=[0., 0., 0.],
inc1=0.,
azi1=225.,
pos2=[-280., -600., 2000.],
inc2=90.,
azi2=270.,
),
step=50
)

make survey objects and calculate the uncertainty covariances

print("Making surveys...")
sh_reference = we.survey.SurveyHeader(
name="reference",
azi_reference="grid"
)
survey_reference = we.survey.Survey(
md=connector_reference.md,
inc=connector_reference.inc_deg,
azi=connector_reference.azi_grid_deg,
header=sh_reference,
error_model='ISCWSA MWD Rev4'
)
sh_offset = we.survey.SurveyHeader(
name="offset",
azi_reference="grid"
)
survey_offset = we.survey.Survey(
md=connector_offset.md,
inc=connector_offset.inc_deg,
azi=connector_offset.azi_grid_deg,
start_nev=[100., 200., 0.],
header=sh_offset,
error_model='ISCWSA MWD Rev4'
)

generate mesh objects of the well paths

print("Generating well meshes...")
mesh_reference = we.mesh.WellMesh(
survey_reference
)
mesh_offset = we.mesh.WellMesh(
survey_offset
)

determine clearances

print("Setting up clearance models...")
c = we.clearance.Clearance(
survey_reference,
survey_offset
)

print("Calculating ISCWSA clearance...")
clearance_ISCWSA = we.clearance.ISCWSA(c)

print("Calculating mesh clearance...")
clearance_mesh = we.clearance.MeshClearance(c, sigma=2.445)

tabulate the Separation Factor results and print them

results = [
[md, sf0, sf1]
for md, sf0, sf1
in zip(c.reference.md, clearance_ISCWSA.SF, clearance_mesh.SF)
]

print("RESULTS\n-------")
print(tabulate(results, headers=['md', 'SF_ISCWSA', 'SF_MESH']))

get closest lines between wells

lines = we.visual.get_lines(clearance_mesh)

plot the result

we.visual.plot(
[mesh_reference.mesh, mesh_offset.mesh], # list of meshes
names=['reference', 'offset'], # list of names
colors=['red', 'blue'], # list of colors
lines=lines
)

print("Done!")

---

ERROR:

Fatal Python error: Segmentation fault

Current thread 0x00007fbd49723740 (most recent call first):
File "/usr/local/lib/python3.8/dist-packages/welleng/visual.py", line 161 in show
File "/usr/local/lib/python3.8/dist-packages/welleng/visual.py", line 268 in plot
File "testwell.py", line 96 in
Segmentation fault (core dumped)

[jonnymaserati]

Hi @prasadkumar0590! Can you let me know which version of welleng you have installed?

we.version.__version__

Also, what OS are you running this on? I just tried with ver0.4.13 on a Windows machine and the code ran okay... if I had to guess it's probably VTK hasn't installed cleanly.

Try doing the advanced install from the instructions here and see if that helps?

[prasadkumar0590]

Hi Jonny, Thank you for your quick response. we are using 0.4.13 version and ubuntu OS.

We have installed advanced welleng only

[jonnymaserati]

Hi @prasadkumar0590. Given that welleng has been developed in an Ubuntu OS, this shouldn't be an issue.

Some of the dependencies require some system level libraries. For example, VTK needs:

sudo apt install vtk9

I think it's likely an issue with VTK.

[prasadkumar0590]

Hi Jonny,

Thank you. we are using ubuntu 20.0.4 version but we did not find vtk9 package. can you please help us on this