Water Injection for Secondary Oil Recovery

Overview

Secondary oil recovery by water injection is the primary enhanced recovery method used by ONGC and private E&P operators in mature Indian oilfields — Rajasthan (Cairn/Vedanta), Gujarat (ONGC Ankleshwar), and the Bombay Offshore basin. As reservoir pressure depletes, injecting treated water or produced water at high pressure into injection wells maintains reservoir pressure and displaces oil toward production wells, recovering reserves that primary production leaves behind.

SEW's Vanguard Series triplex plunger pump handles the high-pressure, continuous-duty water injection service required in oilfield operations — 100–200 bar injection pressure, 40–200 LPM per pump, with construction suitable for H₂S and CO₂ bearing produced water injection service.

How It Works

Source water (freshwater, produced water, or seawater) is treated through de-oiling, filtration, and oxygen removal before injection. The triplex high-pressure injection pump raises treated water pressure to 100–200 bar and delivers it to the injection wellhead. Multiple pumps are run in parallel for large injection volumes. VFD control maintains injection rate at well productivity index requirements. The positive displacement mechanism maintains flow against wellhead back-pressure variation — unlike centrifugal pumps that lose flow significantly as wellhead pressure rises.

Bare Unit Use

Oilfield EPC contractors and ONGC-approved vendors order the bare triplex injection pump for water injection skid fabrication. Available with Duplex SS or Hastelloy C wetted parts for produced water with H₂S and CO₂ content. Flow: 40–200 LPM per pump, pressure: 100–200 bar. API 674 reciprocating pump standard available on request.

Skid Package Use

SEW supplies complete water injection pump skids: triplex high-pressure pump, motor, VFD, suction strainer, pulsation dampener, pressure gauge, relief valve, and injection wellhead connections — on a drip-tray skid designed for outdoor oilfield installation. Used in: ONGC water injection projects (Gujarat, Rajasthan, Bombay Offshore), Cairn/Vedanta Rajasthan block injection operations, and private E&P secondary recovery projects.

Why SEW

100–200 bar continuous injection pressure — maintains injection rate against wellhead back-pressure. Positive displacement pump does not lose flow as wellhead pressure increases — unlike centrifugal.

H₂S and CO₂ compatible materials — Duplex SS and Hastelloy C wetted parts available for produced water injection service in sour gas-associated oilfields.

API 674 standard compliance available — on-request certification for ONGC and international E&P operator procurement specifications.

Indian manufacturer, Nashik — delivery to Rajasthan and Gujarat oilfield sites. Local vendor status supports ONGC domestic procurement preferences.