a novel approach for cost effective method for revival of ... · a novel approach for cost...
TRANSCRIPT
Gas Well Liquification Workshop
Sheraton Hotel, Denver, Colorado
February 23 – 25, 2015
Sacha Sarshar, Dr Najam Beg and Colin Morrison
www.caltec.com
A novel approach for cost effective method for revival of liquid loaded wells
Selection Process for Well De-liquification
Based on Severity of the Case
Lowering the
FWHP by SJP is
sufficient
Well loaded, initial
offloading is needed
Lower FWHP by SJP
After initial offloading
Use SJP plus
intermittent
offloading
Downhole AL system needed
SJP could enhance downhole systems
performance
Case 1 - Mild Case 2 - Medium Case 3 - Severe
Flow regime map for vertical flow
3
Slug
Annular
Mist
Froth
Bubble
Superficial gas velocity (m/s)
4
HP Flow
LP Flow
Combined Flow
Ve
loc
ity
Pre
ss
ure
1 3 4 5 6 7 2 8
HP
LP
Discharge
Nozzle Mixing
tube
Diffuser
Surface Jet Pump Flow Dynamics
HP
LP
Combined Flow
Caltec’s Surface Jet Pump (SJP)
(Otherwise known as an Eductor or Ejector or Velocity Spool™)
HP sources:
• HP wells
• HP gas from process system
• Compressor re-cycled gas
• HP oil / water (injection water)
Well Revival/De-liquification
ME - Onshore
• Issue
• LP gas wells liquid loaded and backed
out. Not producing
• Solution
• Used SJP to deliquify and kick off LP
wells using HP well as motive force at
1000 psig
• Benefits
• Recovered 2 MMscfd from well that
was previously unproductive.
• Stabilised and unloaded liquid from LP
wells
• Tolerant to liquid slugs
• Prevented build up of liquids in well
bore
• Work over/well intervention not
required
• Increased intake capacity of
compressor
Well Revival
Source of HP flow: HP gas well
Benefits:
Gain in gas production by 23,000 sm3/d
(0.812MMscfd)for almost two years
Production Optimisation
Production optimisation by Surface Jet Pump, production stabilisation after 10 months
Selection Process for Well De-liquification Based on
Severity of the Case
Lowering the
FWHP by SJP is
sufficient
Well loaded, initial
offloading is needed
Lower FWHP by SJP
After initial offloading
Use SJP plus
intermittent
offloading
Downhole AL system needed
SJP could enhance downhole systems
performance
Case 1 - Mild Case 2 - Medium Case 3 - Severe
Revival of Wells Using the Test Separator
Feb. 27 - Mar. 2, 2011 2011 Gas Well Liquification Workshop Denver, Colorado 10
Whole Manifold Production Boosting
• Issue
– Multiple wells under-performing or shut-in
– Production manifolds across pipe bridge
• Solution
– Using HP gas from compressor to power the SJP enabled production of 16 wells
– 10 bar pressure reduction / boost
– HP gas from compressor recycle at 100 barg
• Benefits
– Incremental production of 14 mmscfd
– Additional connection to test separator enabled liquid unloading at low pressures
– Increased the producing life and stability of the LP wells
Malaysia – Offshore
Offshore USA (GOM)
Benefits:
•Lowered arrival pressure at the platform by 200 psi
enabling loaded wells to produce consistently
•Higher gas velocities, lowered liquids accumulated in
the pipeline, causing a further 140psi drop at the
wellhead
•Production increased by 24% due to wellhead pressure
reduction and lower pipeline loss.
•2.5 Bscf of otherwise lost reserves recovered.
12
HP Gas from the Existing Compressor on Recycle
Used to Power the Surface Jet Pump
Heavy Outlet Inlet
Compact Cyclonic Separation – Caltec’s I-SEP®
Technology inspired by nature…
High ‘g’ forces are generated from the inlet flow stream’s
momentum by accelerating the flow through an involute to
achieve rapid:
• Coalescence
• Phase separation
Light Outlet
Wellcom Application: Malaysia
Wellcom Boosting System
Benefits:
• Used available energy from HP well
• 20% pressure boost for LP wells
• Increased production by over 35%
(150 b/d)
• Improved flow regime in well bore,
stabilising production
I-SEP
Selection Process for Well De-liquification Based on
Severity of the Case
Lowering the
FWHP by SJP is
sufficient
Well loaded, initial
offloading is needed
Lower FWHP by SJP
After initial offloading
Use SJP plus
intermittent
offloading
Downhole AL system needed
SJP could enhance downhole systems
performance
Case 1 - Mild Case 2 - Medium Case 3 - Severe
Extra Production gain with SJP System and Gas lift
SJP/ Wellcom
System
High Pressure (HP)
source
[Gas or liquid] To
downstream
process
Pay zone
Gaslift injection
system Well production
Lift gas
Surface
Wellbore
Well
Pay zone
Wellhead
Production
via Tubing
Pro
du
ce
d O
il F
low
rate
Additional
production Wellcom system &
Gaslift injection
Gaslift injection
Gaslift Injection Flowrate
Multiphase Boosting Using Part of Gas lift as the HP
Source
• Issue
• MP wells not producing due to back
pressure imposed on subsea export
line
• Solution
• By borrowing some of the available
high pressure export gas as the motive
• Benefits
• A backpressure reduction, A boost in
the pressure of 8 barg was achieved
• Production increased by 24% and 34%
respectively
• Net extra oil gain of 700 bbl/d with
additional 2.5 MMscfd of gas was
achieved
• Low power consumption compared to
alternative solutions
Caltec’s Compact Multiphase Well Test Metering
Package
I-SEP
HI-SEP LT
Liquid
Meter
Gas
Meter
Water
Cut
Meter To
Production
Manifold
Commingler
PT
Multiphase
Inflow
I-SEP®/HI-SEP Part of the Well Testing
I-SEP
HI-
SEP
Feb. 27 - Mar. 2, 2011 2011 Gas Well Liquification Workshop Denver, Colorado 20
Thanks!
Questions…
Feb. 23 - 25, 2015 2015 Gas Well Liquification Workshop
Denver, Colorado
21
Copyright
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Feb. 23 - 25, 2015 2015 Gas Well Liquification Workshop
Denver, Colorado
22
Disclaimer
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The Artificial Lift Research and Development Council and its officers and trustees, and the Gas Well Liquification Workshop Steering Committee members, and their supporting organizations and companies (here-in-after referred to as the Sponsoring Organizations), and the author(s) of this Technical Presentation or Continuing Education Training Course and their company(ies), provide this presentation and/or training material at the Gas Well Liquification Workshop "as is" without any warranty of any kind, express or implied, as to the accuracy of the information or the products or services referred to by any presenter (in so far as such warranties may be excluded under any relevant law) and these members and their companies will not be liable for unlawful actions and any losses or damage that may result from use of any presentation as a consequence of any inaccuracies in, or any omission from, the information which therein may be contained.
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Spare Slides
Feb. 27 - Mar. 2, 2011 2011 Gas Well Liquification Workshop Denver, Colorado 23
Methods for Well Revival by Lowering the FWHP
Initial stage ; Lower the FWHP significantly; A number of methods available based on site
conditions. Use of the test separator is one method
Temporary use of AL to de-liquify well
Followed by operating the well at a lower FWHP
Use of surface jet pump is a cost effective way
to revive wells in many cases
Feb. 27 - Mar. 2, 2011 2011 Gas Well Liquification Workshop Denver, Colorado 24