WATER INJ / TREATMENT FOR TIGHT OIL EOR
SHONN ARNDT, CNRL EXPLOITATION ENGINEER
DEECEMBER 10, 2014
CALGARY, AB, CANADA
2014-03-16, 4:20 PMbigmap.png 1,059×581 pixels
business-conferences.com and cell 403 540 0633. My colleague Emma Borg, the Conference Producer will also be onsite for the duration of
Critical Success Factors:
Please note two points that are critical to the success of this conference from the speakers’ perspective:
• Learning Focused Presentations - No Sales Pitches.
Delegates come here to learn about markets and strategies - not listen to investor presentations. Please keep company slides to a minimum
and ensure you are teaching the delegates something valuable - this always yields a more positive and interested response. There should be
no more than 1-2 slides on the company at the beginning with the main bulk of the presentation focusing on teaching the delegates something
based on the session outline you selected when you confirmed (online at: http://www.artiﬁcial-lift-production-canada-
2014.com/3/agenda/23/agenda/[artiﬁcial-lift-production-canada-2014.com] The presentation can finish with an insight into your company's
capacities. We want to make sure you and the delegates gain as much as possible from this conference and this is approach is the way to do
• Speak For Full Duration (i.e, 30 minutes/ agreed duration with Producer)
It is essential that you fill your full allocated time slot - usually 30 minutes unless agreed otherwise. If in doubt, it's better to go over time than
be under time. Please practice your presentation out loud and make sure it fills the whole time slot.
I look forward to receiving your Dinner responses and presentations soon. Please let me know if you have any queries and I will be more than
happy to assist.
Case Study: Frac Injectors?
Ansai Oil Field, Ordos Basin
In 1990, 44 Wells not fractured with W/H injection pressures of 6.1
23 Neighbouring wells were frac’d and injection pressures were 5.9
Additionally, why convert frac’d producers to injectors?
Conclusion: Water injection will open up natural fractures…do not
exceed frac pressure that will lead to early break through!
Case Study: Low Sal WF
Xi Feng Oilﬁeld
Permeability 1.12 mD
Clay Content 11.4-34.3% (34% Smectite)
Pore Throat Radius 0.05-.29 um
Reservoir Temp 65 C
Oil Density 0.81 g/cm3
Oil Visc 9 cP
Salinity 58 430 mg/L (Ca 2460, Mg 317)
Low Sal Water
A. 5569 mg.L (Ca 200, Mg 30)
B. 2784 mg/L (Ca 100, Mg 15)
No movable ﬁnes Results: Improved %OOIP by 13.3%
Need NF treatment or brackish source!
- - - -
+ + + +
POTENTIAL DAMAGE TO RESERVOIR & WELLBORE
• Large particles >33% ave Pore Throat i.e. 2 mD, Particles>0.5 um will plug.
Near Well Bore
• Clay Swelling
• Adsorption (chemicals / ions)
• Injected small particles
Well bore / Near Well Bore
• Damage from non compatible
drilling / completions / WO ﬂuids
• Artiﬁcial fracs potential channels
for injection ﬂuid
• Water Blocks (if Swi < Swirr)
Reservoir (natural ﬁlter)
• Plastic Deformation of Matrix
• Gas Break out from Oil
Near Well Bore DamageParticle size >7% & < 33% Pore Throat
Can also improve Injectivity with pressure pulsing or seismic stimulation
Formation DamageParticle size <7% will pass through
1. Water driven oil field injected water quality standard
Currently DaQing oil field regular injecting water carries the industrial
standard issued by National Petroleum & Gas General Corporation
<<Particles of Classic Rocks Oil Reserve Injecting Water Standard>> (Table
1) ((SY/T 5329-94) and DaQing Oil Co. Ltd issued enterprise standard <<
DaQing Oil Reserve Injecting Water Standard>> (Q/SY DQ0605-2000)
7DEOH Particles of Classic Rocks Oil Reserve Injecting Water Standard
˘ ̚ ˚
67$1'$5' *5$',1* $ $ $ % % %
İ İ İ İ İ
$9(5$*( 5$7( 2)
65% *(50 36P/ ˘ ˘ ˘ ˘ ˘ ˘
Qh Qh Qh
Qh Qh Qh
1RWH LQ WKH WDEOH İQ˘Ǆ
7DEOH DaQing Oil Reserve Injecting Water Standard (Q/SY DQ0605-
2000) 46 '446 '446 '446 '4
$9(5$*( $,5 3(50($%,/,7
Oilﬁeld Water Technical Requirements China
Also consider water compatibility scaling tendencies other impurities that affect injectivity.
Frac Fluid Req’s
10 cells / mL
Water Treatment Technologies
Suggested Conﬁgurations for Tight Oil
1. Skim Tank - DAF/DGF or EC - MMF - UF - chem inj
Add NF or WAC to remove divalents for Low Salinity ﬂooding
1. Put a reservoir in front of your reservoir (i.e. ﬁltration).
Damage may not be reversible!
2. Mother nature (formation / water quality) drives water
3. It’s critical to inject early and keep the water ﬂowing
(i.e. maintain reservoir pressure).