Bidirectional Plunger Pump MPT

The MPT Bidirectional Plunger Pump is a custom high-temperature miniature hydraulic power unit for harsh downhole oil and gas conditions. Adopting a valve-free structure and high-temperature resistant materials, it removes traditional solenoid directional valves and realizes precise bidirectional hydraulic output via motor rotation adjustment. Its compact integrated design delivers stable, long-life hydraulic performance for space-constrained downhole tools.

This pump solves the common weaknesses of conventional downhole plunger pumps, including high-temperature performance decay, seal failure, structural damage, pressure fluctuation and fluid leakage. It reduces component wear and tool failure rates, lowering downhole operation and maintenance costs while improving overall system reliability and durability.

Validated by 175°C high-temperature tests and 100-hour continuous high-pressure durability tests, it operates stably under 150–180°C and 30 MPa extreme conditions. Ideal for MWD/LWD logging tools, rotary steerable systems, packers and downhole safety valves, its miniaturized structure fits narrow downhole tool spaces and enhances system integration.

Valve-free Bidirectional Operation:

Cancels the traditional solenoid directional valve, effectively reduces system leakage points and structural failure risks. Bidirectional hydraulic output is realized by motor steering adjustment, which simplifies the hydraulic system structure and greatly improves the overall operational reliability of downhole tools.

Superior High-temperature Resistance:

Optimized high-temperature sealing structure and special material formula. It supports 150℃ long-term continuous stable operation and 175℃ peak temperature impact, perfectly adapting to extreme high-temperature downhole working conditions.

High Pressure Resistance & Stable Performance:

Rated working pressure reaches 30MPa. It has passed 100-hour continuous durability comprehensive tests under standard working conditions, with tiny flow fluctuation, good sealing stability and long service life.

Miniature & Compact Structure:

Optimized integrated structural design, small overall footprint, which perfectly fits the narrow internal installation space of downhole logging tools, actuators and other downhole equipment.

MWD/LWD logging tools

Rotary steerable systems

Packers and

Downhole safety valves

Pressure-Torque Diagram (Speed: 2000 rpm)

Pressure-Flow Diagram (Speed: 2000 rpm)

When using the product under high temperature and high pressure, the rotational speed is generally recommended to be no less than 2000 rpm, with an absolute minimum of no less than 1500 rpm-unless the pressure is relatively low. This is because lubrication tends to be poor when the rotational speed is low.

Bidirectional pumps have a cost advantage in scenarios where some actuators are oil cylinders:The figure below shows the simplest bidirectional pump system. No solenoid valve is required, and the oil cylinder can be reversed by simply rotating the pump forward or backward.

It should be noted that for the hydraulic system using a bidirectional pump, sufficient air bleeding must be carried out. It is recommended to perform vacuum pumping for air bleeding at three locations simultaneously. Our company can provide extremely small-sized air bleeding and oil replenishing valves.

Displacement tuning: Custom pump displacement from 3.0 cc to 16 cc according to target flow demand.

Mechanical envelope: Modify overall dimension, shaft interface and mounting structure for limited‑space tool cavities.

Material adaptation: Optimize sealing and component materials for special‑medium or higher‑temperature working conditions.

Performance calibration: Adjust speed‑flow characteristics to satisfy customer‑specific hydraulic system parameters.

Testing support: Customized qualification test scheme upon request.

High‑temperature validation: Verified at peak temperature up to 175 ℃ to simulate real downhole thermal shock.

Long‑duration durability test: 100‑hour continuous running test under rated 30 MPa pressure to assess service life, sealing integrity and flow stability.

Pressure‑leakage screening: High‑pressure tightness test to eliminate internal & external leakage risks.

Performance calibration: Flow‑speed‑pressure curve calibration to ensure output matches design specifications.

Q1: Can the pump be used with different types of hydraulic media?

A1: Yes. The pump is compatible with most common hydraulic media, including hydraulic oil (ISO VG 32/46), downhole working fluid, and brake fluid. It should be noted that the media must be clean (particle size ≤ 10 μm) and free of corrosive impurities to avoid wear or damage to the plungers, valve cores, and seals. For special media (such as high-corrosion fluids), customized corrosion-resistant components can be provided.

Q2: Can the pump be operated continuously for a long time? What is the maximum continuous operation time?

A2: Yes, the pump is designed for long-term continuous operation. It has passed a 100-hour continuous durability test under rated conditions (2000 rpm, 150°C, 30 MPa), and the core components show no obvious wear after the test. Under standard working conditions, the maximum continuous operation time can reach 200 hours; for downhole scenarios, the continuous operation time can be adjusted according to the customized design (up to 500 hours) to meet the long-term operation needs of downhole tools.

Q3: What causes the pump to make abnormal noise during operation, and how to solve it?

A3: Abnormal noise is usually caused by the following reasons: ① Air entering the pump chamber: Check the inlet pipeline for air leakage, and exhaust the air in the pump chamber; ② Lack of lubrication: Add lubricating oil to the drive mechanism (motor, crankshaft, connecting rod); ③ Component wear: Check whether the plungers, valve cores, or bearing components are worn, and replace them if necessary; ④ Unstable drive speed: Adjust the motor speed to ensure stable operation. If the noise persists after troubleshooting, stop the pump immediately and contact professional technical personnel for inspection.

Q4: What should I do if the pump has fluid leakage?

A4: First, check the leakage position to determine the cause: ① If leakage occurs at the plunger and cylinder bore, it is usually due to worn or aging seals, which need to be replaced with new high-temperature and high-pressure resistant seals; ② If leakage occurs at the valve group, check whether the valve core is worn or not tightly closed, clean or replace the valve core; ③ If leakage occurs at the pipeline connection, tighten the connection port or replace the sealing gasket. After replacement, conduct a pressure test to ensure no leakage.

Should you have interest in the MPT bidirectional plunger pump, please share your tool specifications, and we will send you detailed data and commercial offer promptly.

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