Case visit on 2nd October, 2015, no water

Case
1

 

Description of Problem

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New kudu
pump 76K1200 was installed in well on 11th May 2015 with pump
setting depth at 928m below all perforations and ran continuously till 9th
June , 2015 despite increasing torque up to 115% limit.

While
starting the pump at 100 RPM, the water level was 18m and the torque was 11.3%.
On 8th June 2015, the water level had gone up to 412m, while torque
had gone up to 54.2%, The TDS of water was 2250 ppm while temperature of water
on surface was found to be 53 oC. No sand production was reported
during entire period.

 

Inference drawn out

 

The
torque rise was seen suddenly during start-up of the well it may be due to
elastomer swelling or stator choked with sand. As sand production was not
reported so it can be ruined out. The temperature of surface water was noted 53
o C so the elastomer swelling is possible due to high temperature.

 

Recommendations:-

 

Ø  Use
under sized rotor.

Ø  Change
the stator.

 

           Case 2

 

           Description of Problem

 

The
100 TP 1200 PCP was started after work over on 1st June, 2015 with
initial torque 32% and water flow rate 14 lpm. The variation in current and
torque values started from the next day and current variation from 25 to 31A,
while torque variation from 36 to 54% due to stick slip effect. Initially, sand
production of around 1 kg/day was observed in this well for two days, but after
that the sand production ceased. The pump ran continuously till 2nd
October, 2015 with RPM ramped up to 140, while water level staying around 700m.
There were no major changes in current and torque values.

On the
well site visit on 2nd October, 2015, no water flow was observed
with torque variation between 12-45% and current variation between 14 and 16A.
The water level was recorded to be 679m. The PCP was stopped and again started
on the next day, while also ramping up the RPM till 300. The Current varied
from 21 to 28A, while the torque varied from 15-40%. Water production was not
observed on the surface.

 

Inference Drawn Out

 

The
pump was running normally from 1st June till 1st October.
Since the torque variation observed during the site visit on 2nd
October was low and no water production was reported, this could be due to
tubing puncture in the tubing string. Uncentralized rod string could be a root
cause for the Tubing Puncture. No water production was observed because as we
produce water through the tubing string, the water being produced falls back
into the annulus due to the tubing puncture.

 

Recommendations

 

Ø  Work
over job in order to change the tubing

Ø  Centralizers
could be inserted in the rod string in order to minimize tubing- sucker rod
contact.

 

 

 

            Case 3

 

Description of Problem

 

The
well was completed with new 70K900 KUDU pump on 26th April, 2015
with pump intake depth at 352m and run till 19th May, 2015. After
that it was started on 10th June, 2015 by self-flow.

Before
routine start up on 16th July, 2015 water level was 284m at 470 psi.
When the PCP was started at 11:50 hours at 100 RPM without opening the tubing
valve, the torque was found to be 9.8%, while current was 13.4A. the torque
increase was not observed through the tubing valve was not opened.

At
12:15 hours, the RPM was ramped up to 150 with closed tubing valve and observed
for 10 minutes but the torque was only 10.8% at 13.6A. at 12:20 hours, the RPM
was ramped up further to 200 and observed for 10 minutes. But no increase in
torque was observed- the torque was 9.3% at current of 13.4A.

 

Interference Drawn Out

 

From
the above case it can be interpreted as the torque observed was very less and
there was a negligible rise in the torque values on ramping up the RPM. This
could be a reason of sucker rod unscrewing or tubing unscrewing. The unscrewing
of sucker rod or tubing was the main reason for low torque values at high RPM.

 

Recommendations

Ø  Call
for a Work over job.

 

           

 

 

 

 

           
Conclusion:

Based on the study of Challenge and      prospect of CBM the following solutions
can be drawn:

1.     It is
high time for the government to take CBM sincerely and commissioning a complete
system for its exploitation and production in best possible way in India as
other countries like USA, China, and Australia.

2.     Proper
planning in this direction can lead to fruitful results such as proper
monitoring of CBM wells and well site operations etc.

3.     Technology
plays an important role in the development of CBM resources. Thus R&D must
be a priority for the time being.

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