Experience of EOR Applications in SOCAR

Low-Hardness Water Injection Enhanced Oil Recovery Microbial Steam Injection Alkaline Flooding In Situ Combustion Foam Injection Low-Hardness Water Injection

Scheme of Microbial EOR (MEOR) Culture Liquid Injection Well Producer Well The Injected Bioreagents Oil Metabolic Zone

Incremental Oil Production of MEOR dynamics incremental oil production ~ 170 ths. tons

Results of MEOR Stimulation Objects The Amount of Injected Culture Liquid, t Amount of Producer Wells Under Stimulation Total Oil Production Due to Technology, t Milk Whey Activated Sludge Molasses Hydrocarbon- Alkaline Solution For All Objects 17077, 8 7948 243,5 10 338 169296,0 “Binagadineft” (5) 9312 3666 - 142 87037 “Balakhanineft” (3) 1176 538 24 11277 “Surakhanineft” (1) 2409 17 34141 “Bibieybatneft” (3) 1547,2 1092 165,5 56 23438,5 Named after A.D.Amirov (4) 2188,4 2302 48 52 8023 Named after G.Z.Tagiyev (1) 166 200 7 3047 “Absheronneft” (2) 279,2 150 30 31+8 2332,5

incremental oil production ~ 959 ths. tons In Situ Combustion Oil recovery, ths. tons Years after before incremental oil production ~ 959 ths. tons

Results of In-Situ Combustion Field Area Horizon Incremental oil production, ths. tons Balakhany-Sabunchi-Ramana Khorasani GALDupper 340,43 II GALDlow 203,07 Goshanohur II GALDlow+ II GALDupper 67,02 Balakhany GALDlow (block II-III) 43,43 Surakhany IIa-II-III 6,89 IIIaIII-IV 85,89 Umbakı Umbaki I Chocrak 52,4 Gala IIa-III 0,75 Pirallahy North fold-onshore GALD 156,4

incremental oil production ~ 692 ths. tons Steam Injection Oil recovery, ths. tons after before Years incremental oil production ~ 692 ths. tons

Results of Steam Injection Field Area Horizon Incremental oil production, ths. tons Balakhany-Sabunchi-Ramana Khorasani II GLDlow 155,32 Binagadi Binagadi-Kirmaki GD4 126,02 GD5a+b 237,94 Binagadi-North GD5abcd 114,27 Locbatan-Puta-Qushkhana Puta-Qushkhana VI-VII 9,8 Pirallahy GALD 10,6

incremental oil production ~ 11 ths. tons Alkaline Flooding Oil recovery, ths. tons Years before after incremental oil production ~ 11 ths. tons

Results of Alkaline Flooding Fields Incremental Oil Production, ths. tons Kurovdag 3,0 Balakhani – Sabunchu - Ramana 8,0

Alkaline Flooding Displacement Mechanism Reduction of surface tension; Generation of foam-like emulsion as a result of reaction between petroleum acids and alkaline solution; Disruption of film at the interface of alkaline solution and oil, formed as a result of surface adsorption of active components.

Foam Flooding In Siyan-Shor Field incremental oil production ~ 23 ths. Tons

Foam Flooding In Sulu-Tapa Field Years Volume of Working Agents Injected, ths. m3 Amount of Enhanced Oil Recovery ths m3 incremental oil production ~ 13 ths. tons

Foam Flooding Displacement Mechanism Foam-forming substances are injected into the reservoir via annular space from the surface. Surfactants are regularly or periodically added into active agent (gas) in parts Foam, inside the reservoir, is formed as a result of injection of chemical blowing agent and gas-generating process initiator To generate foam, several surfactants and CO2, N2 and hydrocarbon type gases are used.

Low Hardness Water Flooding Method is based on enhanced outwashing ability of sea water by reducing its hardness through addition of reagent "Azerbaijan-4” The reagent contains components capable to precipitate salt in the form of gel when added to the produced or sea water. Purified from the gel water becomes alcalinous. Surface tension at the oil-water interface reduces, which helps to improve oil removing properties of water. Seawater pH = 6,0, fresh water pH = 7.5, pH of sea water treated with a reagent - 8.2, indicates an increase in alkalinity. It was established experimentally that the final oil displacement coefficient seawater is – 0.51, fresh - 0.58, low hardness water - 0.74. Thecnology was effectively used in 1978-1981 at fields Sangachali - Duvanniy - Khara-Zira.

Low Hardness Water Core Flooding Experiment

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