Water Injection Pump

The injection pump is the pressure source for waterflood: it takes treated injection water at the suction and delivers it at the reservoir pressure (13 to 68 MPa across the range) through the wellhead into the formation, replacing the pressure that declines as the field produces. The objective is to hold the reservoir pressure above the bubble point, keep the producing wells on line and extend the field's productive life rather than letting the pressure support decline.

Centrifugal injection pumps carry large volume at lower pressure — the 4–36 m³/h rate at the 13–25 MPa range, where a single barrel moves shallow and medium wells without the maintenance load of a plunger end. Plunger pumps hold the high-pressure end of the envelope (up to 68 MPa) for deep reservoirs and low-permeability zones, where the flow is smaller but the pressure must stay accurate through long injection cycles. The choice is made on the reservoir pressure and the required injection rate, not on pump brand: send the target bottomhole pressure and the make-up rate and we quote the pump type, plunger count and power rating.

Yes. The wetted-end material — plungers, valves, liners and manifold — is chosen against the injection water analysis, not by a default spec. For high-salinity water we quote duplex or stainless fluid ends with ceramic plungers; for produced-water injection with solids carry-over, the valve and liner materials are upgraded and the suction strainer and cyclone are sized on the particle report. Send the water quality sheet (salinity, TDS, solids count, H2S/CO2 if any) with the inquiry and the wetted-end materials are quoted against that analysis rather than assumed.

The pump is sized to the injection rate the reservoir actually needs, not to a nameplate maximum: the variable-frequency drive trims the motor speed to the rate, so the unit does not run against a bypass at partial load. Protection covers over-pressure, motor overload and low suction, and the wetted-end materials are chosen against the water analysis so the packing and valve life match the duty rather than the calendar. Send the injection rate and bottomhole pressure with the inquiry and the pump curve is quoted to that point.

Yes. The configuration is settled against the water-injection programme before the order: pump type (suction-fed ZJ3GY or booster-fed ZJ3ZY), outlet pressure and rate rating within the 13–68 MPa and 4–36 m3/h range, wetted materials for the treated water, control mode and explosion-proof grade are matched to the reservoir pressure, injection allocation and site power supply, then written into the quotation and the factory test report.