Stimulation of Sandstone and Carbonate Reservoirs Using Chelating Agents. Amin Ameri October, 2016
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1 Stimulation of Sandstone and Carbonate Reservoirs Using Chelating Agents Amin Ameri October, 2016
2 Major problems with carbonate acidizing
3 Major problems with sandstone acidizing
4 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
5 Summary GLDA ASDA EDG MGDA HEDTA MSA HCl Solubility ph< / Calcite dissolution + +/ Carbonate (300 F, 2cc/min) * Dependent on T and flow rate conditions * -* Sandstone ++ +/ n.d. - Thermal stability Corrosion L /- +/- +/- +/- - - Corrosion Cr /- - - Health Biodegradability (OECD 301D) Solubility in 15% HCl n.a /- ++ n.d. n.a. Iron control /- ++ n.a. n.a.
6 Low corrosion profile GLDA HEDTA Coupons fully dissolved 6-hours metal loss (lbs/sq.ft) wt% GLDA wt% Citric acid wt% Acetic acid wt% MGDA wt% HEDTA 10wt% 15wt% HCl Formic acid Cr F N 2 head space 6 hour metal loss at temperature
7 Low corrosion profile 6-hour metal loss (lbs/sq.ft.) GLDA Acetic Coupons fully dissolved No CI 0.001v% CI GLDA 20wt% HEDTA 20wt% MGDA 20wt% Acetic acid Citric 10wt% acid Formic 10wt% acid 10wt% HCl 15wt% L-80 carbon steel 300 F N 2 head space 6 hour metal loss at temperature
8 Stimulation in carbonate reservoirs 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
9 Lab Study 1.0 ml/min T and P Introduction StimWell References Conclusions
10 Stimulation in sandstone formations Acids are used to dissolve the soluble materials Solubility tests in the lab (samples from TU Delft - W-1) 100 C for 6 hours Solvent Dissolved [%] SW HTF 50% 9.87 SW DDH 50% 7.55 HCl 15% 14.34
11 Stimulation in sandstone formations Coreflood tests with Bandera cores Bandera core (10% illite)
12 Case Histories - Overview F Stimulation Sandstone Dolomite Chalk Calcite Formation Descaling Pickling Applications Carbon steel ESP Cr Ni-Cr Temperature Geometry Materials
13 De-scaling Descaling using StimWell HTF Introduction StimWell References Conclusions
14 Field application I: Tight, sour gas well Production Rate (MMSCFD) % F 20% H 2 S 9% CO 2 Carbonate (calcite and dolomite) Porosity: 11.5% Permeability: 4 md CRA and carbon steel 20wt% GLDA at ph= Pre-treatment Post treatment target GLDA treatment Expected fracturing result SPE
15 Field application I: Tight, sour gas well Concentration (ppm) Sample nr Effective dissolution of calcite and dolomite No after treatment required Ca Mg All flowback samples ph>6 Concentration (ppm) Sample nr No corrosion 325 F 20% H 2 S 9% CO 2 Calcite and dolomite Porosity: 11.5% Permeability: 4 md CRA and carbon steel 20wt% GLDA at ph=3.4 Fe in stimulation fluid Mn Fe Cr SPE
16 Field application II: Horizontal well Well 1 Well 2 Before stimulation Liquid rate (bbl/day) PI (bbl/day/psi) After stimulation Liquid rate (bbl/day) PI (bbl/day/psi) F 200 ppm H 2 S 6mol% CO 2 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
17 Field application III: Descaling ESP 160 F FeCO 3 and CaCO 3 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
18 Field application III: Descaling ESP Concentration (ppm) Ca Fe Mn 160 F FeCO 3 and CaCO 3 around ESP 20wt% GLDA at ph= Zn Sample nr Analysis of flowback samples proved dissolution of the scales, without any adverse impact on the ESP or well tubular SPE
19 References Subject Reference Year Field applications Carbonate coreflood SPE : SPE P&O (2013) 28-3, pp SPE SPE : J. of Can. Pet. Tech., 54-5, pp SPE SPE : SPEJ (2011), 16-3, pp SPE : SPEJ (2011), 16-4, pp SPE Sandstone coreflood SPE SPE SPE : SPE P&O (2015), 30-1, pp43-51 Corrosion SPE SPE HSE SPE SPE Reaction rates SPE SPE Filtercake removal SPE
20 Thank you for your attention Questions?
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REAGENT CHEMICALS Appendix pubs.acs.org/doi/book/10.1021/acsreagents Useful Equations and Conversions Henderson Hasselbalch equation ph = pk a + log fraction neutralized fraction unneutralized ph = pk
Classification based on shape:
Dwi Priyo Ariyanto http://www.ariyanto.staff.uns.ac.id Definition Soil structure is arrangement of individual soil particles into a pattern Soil structure is a compilation of tiny, medium and big soil
Recommendations/Comments for "IPC 1601" (Implementation subject to customer/supplier agreement)
3.1.1 a. Store materials in moisture-proof packaging in a controlled environment (humidity- and temperaturecontrolled). b. Handle PP + resin-coated films with gloves only at the edges. c. Reseal opened