Stimulation Fluids
Case Histories
Dulang B-12 Stimulations
with
KO Plus LO + HDC MK II
CHALLENGE/RESULT
• Production drop to 0 bbls/d liquid for 2 years.
• Suspected massive damage from Barite sedimentation
• Inaccessible other two zones due to mechanical issue.
• SOLUTION : Stimulations with Ko Plus + HDC MK II
• RESULT : Production increased to 813 bbls/d liquid 82% WC.
Prod Tech in charge – Shaliheen M Hatta
BULLHEADING SIMULATION
Spacer Ahead
Ko Plus LO
Spacer Fluid
Displacement fluid
HDC MK II
HDC MK II
Spacer fluid
Ko Plus LO
Plug (isolation)
Displacement fluid
Tembungo A09
Stimulations with
KO Plus LO + HDC MK II
CHALLENGE/RESULT
• Production drop to 120 bbls/d liquid from 550 bbls liquid
• Suspected massive damage from LCM during workover in 2008
• Inaccessible thru tubing suspected scale build up downhole. Pumped
thru annulus.
• SOLUTION : Stimulations with Ko Plus + HDC MK II/POOH ESP
• RESULT : Production increased to 1000 bbls/d liquid 70% WC.
Prod Tech in Charge – Zadil Hayat & Hasmiza Bakar
** LCM : Loss Circulation Material
BULLHEADING SIMULATION
thru Annulus
Spacer Ahead
Ko Plus LO
Spacer Fluid
ESP
Displacement fluid
HDC MK II
Ko Plus LO
Spacer fluid
HDC MK II
Displacement fluid
Tembungo A08
Stimulations with
KO Plus LO + HDC MK II
CHALLENGE/RESULT
• Production drop to ~40 bbls/d liquid
• Suspected massive damage from LCM during workover in 2008
• After stimulation, unable to retrieve plug due to debris found on top
of plug.
• SOLUTION : Stimulations with Ko Plus + HDC MK II/Fishing
• RESULT : Production increased to 968 bbls/d liquid 5.43% WC.
• After wireline fishing, debris found to be part of competion
accessories. And successfully retrieved plug.
Prod Tech in Charge – Zadil Hayat & Hasmiza Bakar
** LCM : Loss Circulation Material
BULLHEADING SIMULATION
Spacer Ahead
Ko Plus LO
Spacer Fluid
Displacement fluid
HDC MK II
HDC MK II
Spacer fluid
Ko Plus LO
Spacer fluid
Plug (isolation)
Displacement fluid
Loss Circulation
&
Water Shut Off
Solution
Fast Set Silicate – LCM
• Is a loss circulate material (LCM) to reduce injectivity
temporarily.
• Able to reduce significant losses while injecting shutting
off material (fluid) and allow the treatment fluid to set
permanently.
•Applied when pumping operations experiencing
significant loss. (typically 2.5 bpm and above and very low
injecting pressure or under vacuum conditions)
Fast Set Silicate – Case History
• Baronia 23, SKO, PCSB
• Well injectivity was over 5 bpm at vacuum conditions.
• 50 bbls of Fast Set Silicate was bull headed and brought
down injectivity to 1 bpm at 500 psi.
•This permitted the planned well interventions to shut off
the intended zone to be continued.
•The lost circulation zone (water producing) was properly
shut off.
Water Off Gel 1 – WOG1
• Is a long lasting permanent plug for water shut off.
• It is low viscosity, solids free and self activating gel.
• It is rigid and dimensionally stable and in liquid form, it
can penetrate into narrow fracture.
• Forms a stable, permanent plug. It can be used as a
permanent water shut off material.
Water Off Gel 1 – WOG1
1. WOG1 consist of 4 components – water, sodium silicate,
urea based compound and glyoxol based activator.
2. When the glyoxol based activator is added in at certain
concentration, it will caused a polymerization process that
transform it from liquid stage into solid stage.
3. It creates a solid gel downhole and can withstand
compressive differential pressure between 1500 – 2000 psi.
Benefits of WOG1
1. Easy to mix and pump. Self activating forming a
homogenous gel.
2. Suitable for plugging pores, small fractures in deep narrow
fractures or channel.
3. Suitable for zone abandonment. Hardening time can be
adjusted by manipulating additives concentration.
4. Does not contain extremely hazardous substances.
WOG1 vs Cement Plug
WOG1 Temperature Sensitivity Analysis
Temperature sensitive only to determine amount of activator needed.
The higher the temperature, the lower activator needed to make the gel
set
WOG1 Case History
Baronia 23, SKO, PCSB
1. Shut off Zone is RM 3.2, depth 6855 – 6889 ft. (34 ft)
2. During injectivity test, well was found to be in vacuum
condition and loss circulation material was used to lower
down injectivity rate.
3. WOG1 was then displaced to cover 5 ft radial penetration
and left downhole to set.
4. After setting time, hydrotest was performed and the
permanently set pill held pressure above 300 psi for
duration of the test.
5. After 6 months the well still production at 1000 bbl/d at 0%
WC
Prod Tech in Charge – Ibrahim Subari
BULLHEADING SIMULATION
Helps to divert
WOG 1
To displace fluid in tubing
and surface line
To avoid contamination of
WOG 1
Heavy brine 9.69
ppg KCL
Fresh Water
Spacer Ahead
WOG 1
To ensure residual of WOG 1
left behind will not set
WOG 1
Contaminant Gel
Fresh
Fresh
Spacer
Ahead
Water
Water
Fresh
Water
Heavy Brine
Contaminant Gel
Fresh Water