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

Rights to this presentation are owned by the company(ies) and/or author(s) listed on the title page. By submitting this presentation to the Gas Well Liquification Workshop, they grant to the Workshop, the Artificial Lift Research and Development Council (ALRDC), and the Southwestern Petroleum Short Course (SWPSC), rights to:

– Display the presentation at the Workshop.

– Place it on the www.alrdc.com web site, with access to the site to be as directed by the Workshop Steering Committee.

– Place it on a CD for distribution and/or sale as directed by the Workshop Steering Committee.

Other use of this presentation is prohibited without the expressed written permission of the author(s). The owner company(ies) and/or author(s) may publish this material in other journals or magazines if they refer to the Gas Well Liquification Workshop where it was first presented.

Feb. 23 - 25, 2015 2015 Gas Well Liquification Workshop

Denver, Colorado

22

Disclaimer

The following disclaimer shall be included as the last page of a Technical Presentation or Continuing Education Course. A similar disclaimer is included on the front page of the Gas Well Liquification Web Site.

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.

The views, opinions, and conclusions expressed in these presentations and/or training materials are those of the author and not necessarily those of the Sponsoring Organizations. The author is solely responsible for the content of the materials.

The Sponsoring Organizations cannot and do not warrant the accuracy of these documents beyond the source documents, although we do make every attempt to work from authoritative sources. The Sponsoring Organizations provide these presentations and/or training materials as a service. The Sponsoring Organizations make no representations or warranties, express or implied, with respect to the presentations and/or training materials, or any part thereof, including any warrantees of title, non-infringement of copyright or patent rights of others, merchantability, or fitness or suitability for any purpose.

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