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Chelating Agents - · PDF file Chelating Agents Amin Ameri amin.ameri@akzonobel.com October, 2016 . Introduction StimWell™ References Conclusions Major problems with carbonate acidizing

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  • Stimulation of Sandstone and Carbonate Reservoirs Using Chelating Agents

    Amin Ameri amin.ameri@akzonobel.com October, 2016

  • Introduction StimWell™ References Conclusions

    Major problems with carbonate acidizing

  • Introduction StimWell™ References Conclusions

    Major problems with sandstone acidizing

  • Introduction StimWell™ References Conclusions

    Chelates ▬ StimWell Portfolio

    Dissolvine StimWell is a chelate based product series

    – Dissolvine StimWell HTF (pH 3.8): •  CaCO3 •  Iron scales

    – Dissolvine StimWell DGH (pH 11.5): •  CaSO4

    – Dissolvine StimWell DDH (pH 14): •  BaSO4 •  SrSO4

  • Introduction StimWell™ References Conclusions

    Summary

    GLDA ASDA EDG MGDA HEDTA MSA HCl Solubility pH

  • Introduction StimWell™ References Conclusions

    0.0009 0.0011

    0.0318 0.0900

    0.5253

    0.00

    0.10

    0.20

    0.30

    0.40

    0.50

    0.60

    0.70

    0.80

    0.90

    1.00

    20wt% GLDA

    10wt% Citric acid

    10wt% Acetic acid

    20wt% MGDA

    20wt% HEDTA

    10wt% Formic acid

    15wt% HCl

    6- ho

    ur s

    m et

    al lo

    ss (l

    bs /s

    q. ft)

    •  Cr-13 •  300°F •  N2 head space •  6 hour metal loss at

    temperature

    Coupons fully dissolved GLDA HEDTA

    Low corrosion profile

  • Introduction StimWell™ References Conclusions

    •  L-80 carbon steel •  300°F •  N2 head space •  6 hour metal loss at

    temperature

    0.1956

    0.0394

    0

    0.2

    0.4

    0.6

    0.8

    1

    1.2

    GLDA 20wt% HEDTA 20wt% MGDA 20wt% Acetic acid 10wt% Citric acid 10wt% Formic acid 10wt% HCl 15wt%

    6- ho

    ur m

    et al

    lo ss

    (l bs

    /s q.

    ft. )

    No CI

    0.001v% CI

    Coupons fully dissolved

    GLDA Acetic

    Low corrosion profile

  • Introduction StimWell™ References Conclusions

    • Acids are used to create wormholes to connect the formation to the wellbore

    • Success depends on how deep this acid will penetrate into the formation creating uniform wormholes

    Stimulation in carbonate reservoirs

  • Introduction StimWell™ References Conclusions

    Lab Study

    9

    1.0 mL/min Coreflood @ T and P

  • Introduction StimWell™ References Conclusions

    • Acids are used to dissolve the soluble materials

    • Solubility tests in the lab (samples from TU Delft - W-1)

    – 100°C for 6 hours

    Stimulation in sandstone formations

    Solvent Dissolved [%] SW HTF 50% 9.87 SW DDH 50% 7.55 HCl 15% 14.34

  • Introduction StimWell™ References Conclusions

    Stimulation in sandstone formations

    Bandera core (10% illite)

    • Coreflood tests with Bandera cores

  • Introduction StimWell™ References Conclusions

    Case Histories - Overview

    Formation

    Geometry Temperature

    Stimulation

    Descaling

    Pickling

    Applications

    150

    200

    250

    300

    Chalk

    Calcite

    Sandstone Dolomite

    Materials

    Carbon steel

    Ni-Cr Cr

    ESP 0  

    50   100   150   200   250   300   350   400  

    °F

    400

  • Introduction StimWell™ References Conclusions

    Descaling using StimWell HTF

    De-scaling

  • Introduction StimWell™ References Conclusions

    Field application I: Tight, sour gas well

    Post treatment

    target

    Pre-treatment

    5.25

    4.2

    3.15

    0

    Pr od

    uc tio

    n R

    at e

    (M

    M SC

    FD )

    2.1

    1.05

    Expected fracturing

    result

    +110%

    2.1

    3.4

    4.4

    5

    GLDA treatment

    SPE 163332

    •  325°F •  20% H2S •  9% CO2 •  Carbonate (calcite

    and dolomite) •  Porosity: 11.5% •  Permeability: 4 mD •  CRA and carbon

    steel •  20wt% GLDA at

    pH=3.4

  • Introduction StimWell™ References Conclusions

    Field application I: Tight, sour gas well

    No after treatment required

    0

    10

    20

    30

    40

    50

    0 5 10 15 20

    C on

    ce n

    tr at

    io n

    ( p

    p m

    )

    Sample nr

    Fe in stimulation fluid Mn Fe Cr

    0

    2000

    4000

    6000

    8000

    10000

    0 5 10 15 20

    C on

    ce n

    tr at

    io n

    ( p

    p m

    )

    Sample nr

    Ca

    Mg

    All flowback samples pH>6

    Effective dissolution of calcite and dolomite

    No corrosion SPE 163332

    •  325°F •  20% H2S •  9% CO2 •  Calcite and

    dolomite •  Porosity: 11.5% •  Permeability: 4 mD •  CRA and carbon

    steel •  20wt% GLDA at

    pH=3.4

  • Introduction StimWell™ References Conclusions

    Field application II: Horizontal well

    •  271°F •  200 ppm H2S •  6mol% CO2 •  Permeability: 50

    mD •  L-80 tubular •  >4500 feet

    horizontal section completed within 4 hydraulic sliding sleeves

    •  20wt% GLDA at pH=3.4 at 0.25 bbl/ ft

    Effective residual filtercake removal and stimulation from heel to toe due to slow reaction rate

    Before stimulation After stimulation

    Liquid rate (bbl/day)

    PI (bbl/day/psi)

    Liquid rate (bbl/day)

    PI (bbl/day/psi)

    Well 1

    680 0.8 1215 1.8

    Well 2

    350 0.4 900 1.6

  • Introduction StimWell™ References Conclusions

    Field application III: Descaling ESP

    •  160°F •  FeCO3 and

    CaCO3 around ESP

    •  20wt% GLDA at pH=3.4

    The oil production increased from 400 to 512 STB/day and the PI improvement sustained for 6 months SPE 166335

  • Introduction StimWell™ References Conclusions

    Field application III: Descaling ESP

    Analysis of flowback samples proved dissolution of the scales, without any adverse impact on the ESP or well tubular

    SPE 166335

    0

    500

    1000

    1500

    2000

    2500

    0 10 20 30 40 50 60

    C on

    ce nt

    ra tio

    n (p

    pm )

    Sample nr

    Ca

    Fe

    Mn

    Zn

    •  160°F •  FeCO3 and

    CaCO3 around ESP

    •  20wt% GLDA at pH=3.4

  • Introduction StimWell™ References Conclusions

    Subject Reference Year

    Field applications SPE 163332: SPE P&O (2013) 28-3, pp277-285 SPE 166335 SPE 168163: J. of Can. Pet. Tech., 54-5, pp289-297 SPE 173774

    2012 2013 2014 2015

    Carbonate coreflood SPE 127923: SPEJ (2011), 16-3, pp559-574 SPE 133497: SPEJ (2011), 16-4, pp968-980 SPE 140149

    2010 2010 2011

    Sandstone coreflood SPE 139815 SPE 143301 SPE 147395: SPE P&O (2015), 30-1, pp43-51

    2011 2011 2011

    Corrosion SPE 152716 SPE 160849

    2012 2012

    HSE SPE 157467 SPE 168145

    2012 2014

    Reaction rates SPE 139816 SPE 164480

    2011 2013

    Filtercake removal SPE 155426 2012

    References

  • Thank you for your attention

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