Polymer Flooding at Vostochno-Messoyakhskoye Field

1.

Polymer Flooding at
Vostochno-Messoyakhskoye Field
Goal: +11 % recovery (KIN) via cross-linked polymer systems
Author: ___________, Advisor: ___________
Time limit for talk: 7–10 min

2.

Field Snapshot & Key Challenges
Location: south-west Gydan Peninsula, YNAO
Oil viscosity 111 mPa·s, low T (9 °C), gas cap + aquifer
Reservoir heterogeneity (KV = 0.8); current KIN 0.027 (< 0.259)

3.

Current Development Snapshot
(2022)
615 wells: 419 producers, 156 injectors (1 : 2.7)
Water cut ↑ to 79 %; peak oil 4.9 Mt (2019)
Pressure drop 10 %; localized declines to –50 %

4.

Problem Statement
Early water breakthrough via high-perm channels
Uneven sweep → stranded oil in floodplain facies
Need selective profile control & mobility ratio++

5.

Technology Choice: SPS-PPG
HPAM 0.25 % + PEI cross-linker → pre-gel particles (PPG)
Works at 9–20 °C, salinity <18 g/L
Forms in-situ gel, blocks thief zones, diverts flow

6.

Selecting Wells: Tracers + Machine
Learning
Tracer test: inj 361 → fastest arrival 1362 & 1389
CatBoost model (F1 = 0.95) ranked 11 producer pairs
Pilot cluster: 361 → 1389, 1361, 390, 1362

7.

Pilot Technical Effect
Polymer mass: 7.3 t (cluster)
Δq oil start +11 t/d → year +5 t/d
Annual gain ≈ 8 kt oil (+8 %)

8.

Economics at Glance
CAPEX 415 M RUB; OPEX 140 M RUB/yr
NPV 123 M RUB @ 22 % discount
IRR 32.6 %; Payback 5.2 yr; PI 1.30

9.

Sensitivity & Risks
Most sensitive: oil price –15 %, volume –14 %
Tolerates: CAPEX +31 %, OPEX +35 %, r +44 %
Mitigation: phased scale-up, cost control, offtake hedging

10.

Conclusions & Next Steps
SPS-PPG feasible & profitable for PK1-3
Pilot (2026) → decision gate in 12 mo
Full-field roll-out could add +11 % KIN