How to select different types of injection pumps?

Elephant Machinery injection pump is generally applicable to oil extraction, particularly in fields such as enhanced oil recovery (EOR) and chemical injection. The primary types of Elephant Machinery injection pump include water injection pump, polymer injection pump, and CO₂  injection pump. Although they are all referred to as “injection pumps,” their design principles, operating mechanisms, and application scenarios differ significantly.

1. Water Injection Pump: Its core function is to inject water, wastewater, oilfield waste oil, and brine into oil reservoirs, increasing formation pressure to drive crude oil toward the wellbore. In practical applications, water injection pumps are widely deployed in various oilfield injection stations, to be critical equipment for achieving stable production and enhanced oil recovery. They are particularly suitable for developing medium-to-low permeability reservoirs. Through continuous and stable water injection operations, they improve waterflood efficiency in reservoirs and enhance crude oil extraction rates.

2. Polymer Injection Pump: To be a pump specifically designed for oilfield polymer flooding processes. Its core function is to inject polymer solutions, alkaline solutions, deactivators, binary fluids, or ternary fluids into reservoirs at precise flow rates and pressures. Through the adsorption, retention, and viscosity-increasing effects of polymer molecules within the pore medium, it effectively improves the water-oil mobility ratio, enhances the sweep efficiency, and increases oil recovery rates. In practical applications, polymer injection pumps demand exceptionally high flow stability and pressure control precision. Typically integrated into polymer injection stations for tertiary oil recovery operations, they are well-suited for developing mature fields with high water cut. By injecting high-molecular-weight, low-hydrolysis-degree polymer solutions, these pumps significantly enhance oil displacement efficiency and extend the operational lifespan of oilfields.

3. CO₂ Injection Pump: Its core function is to continuously inject supercritical or liquid CO₂ into oil reservoirs at specific pressures and flow rates. By leveraging the physicochemical interactions between CO₂ and crude oil—such as reducing crude viscosity, improving fluidity, expanding oil volume, and extracting light components—it enhances oil recovery rates. During process execution, CO₂ collected from emissions in energy production or other industries is sometimes utilized. In practical applications, this pump is widely employed in CO₂ enhanced oil recovery (EOR) technology, particularly suited for developing low-permeability, high-viscosity crude reservoirs. By injecting CO₂ into formations, it not only effectively improves crude fluidity but also enables geological sequestration of CO₂, achieving a win-win outcome of energy conservation, emission reduction, and resource development. It is to be a crucial piece of equipment for realizing green and efficient oilfield development.

The specific selection depends on the characteristics of the application scenario. For high-viscosity crude oil extraction requiring environmental benefits, CO₂ injection pumps are ideal, as they improve crude oil flow through physicochemical effects while sequestering CO₂. For medium-to-low permeability reservoirs, water injection pumps stabilize formation pressure to drive crude oil flow. For tertiary recovery operations in mature fields with high water cut, where enhancing sweep efficiency and oil displacement is crucial, polymer injection pumps with high precision control over flow rate and pressure are more suitable. Ultimately, the selection should be based on your application objectives, reservoir characteristics, and target recovery goals. Elephant Machinery can tailor customized solutions to meet your specific requirements.