Bidirectional Plunger Pump MPT

The MPT Bidirectional High-Temperature Plunger Pump is a high-performance plunger pump independently developed by integrating mature bidirectional pump control technology with advanced high-temperature adaptation design, specifically tailored to meet the harsh working conditions of high-temperature downhole environments in the oil and gas industry. By optimizing the core structure and selecting high-temperature resistant materials, this pump effectively overcomes the technical bottlenecks of traditional plunger pumps that are prone to performance degradation, seal failure, and structural damage under high-temperature and high-pressure downhole conditions, providing a reliable and stable hydraulic power solution for downhole tools.

To ensure its adaptability and long-term operational reliability in extreme downhole environments, the product has undergone a series of rigorous performance and durability tests, with excellent test results verifying its superior quality. It has successfully passed the high-temperature performance test at 175°C, where all key performance indicators (including flow stability, pressure control accuracy, and seal tightness) remained within the designed standard range, without any abnormal phenomena such as leakage, noise, or pressure fluctuation. This confirms the pump's ability to operate stably in high-temperature downhole environments where the temperature often reaches 150–180°C.

In addition, the pump has undergone a 100-hour continuous durability test under the rated operating conditions of 2000 rpm rotational speed, 150°C working temperature, and 30 MPa working pressure-conditions that fully simulate the long-term operational status of downhole tools such as rotary steerable systems and downhole safety valves. After the completion of the durability test, professional detection and analysis showed that the pump's core components (including plungers, valve cores, and seals) had almost no wear, deformation, or performance attenuation, and the overall structure remained intact without any obvious changes. This outstanding durability ensures that the pump can maintain stable and reliable operation for a long time in harsh downhole environments, reducing the frequency of tool maintenance and replacement, and improving the efficiency of downhole operations.

With its advanced bidirectional pump control technology, the MPT Bidirectional High-Temperature Plunger Pump can realize precise bidirectional fluid delivery and pressure control, which is particularly suitable for downhole tools that require accurate hydraulic power output, such as MWD/LWD logging tools, packers, and downhole safety valves. Its compact structural design also allows it to be directly inserted into the valve block, perfectly adapting to the limited installation space of downhole equipment, further enhancing the integration and miniaturization level of downhole hydraulic systems.

- Precise Pressure and Flow Control: The positive displacement structure ensures that the flow rate is proportional to the rotational speed of the drive mechanism, and the pressure can be adjusted according to the load of the hydraulic system, realizing precise control of pressure and flow, which is suitable for precision hydraulic equipment.

- High Efficiency and Energy Saving: The bidirectional switching mechanism avoids the energy loss caused by additional control valves, simplifies the hydraulic system structure, and improves the overall energy efficiency of the system.

- Adaptability to Harsh Environments: The compact structure and high-temperature and high-pressure resistant components (seals, valve cores) enable it to maintain stable operation under extreme conditions such as high temperature (up to 180°C), high pressure (up to 80 MPa), and vibration, which is especially suitable for oil and gas downhole working environments.

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.

1. Superior High-Temperature Adaptability, Suitable for Extreme Working Environments

Our Bidirectional Plunger Pump is specially designed for high-temperature operating conditions, such as downhole environments in the oil and gas industry. It has successfully passed a strict performance test at 175°C, and all key indicators (including flow stability, pressure tightness, and component integrity) remain within the design standard without any abnormal performance. In addition, it has undergone a 100-hour continuous durability test under the rated conditions of 2000 rpm, 150°C, and 30 MPa-fully simulating the long-term working state of downhole tools. After the test, the core components (plungers, valve cores, seals) showed almost no wear, deformation, or performance attenuation, which effectively solves the pain points of traditional plunger pumps such as seal failure and structural damage under high-temperature and high-pressure conditions. It can stably operate in environments with a temperature range of -40°C to 180°C, perfectly adapting to the harsh downhole working conditions.

2. Advanced Bidirectional Pump Control Technology, Realizing Precise Hydraulic Regulation

Based on mature and upgraded bidirectional pump control technology, our product can achieve precise bidirectional fluid delivery and pressure control, with high control accuracy and stable flow output. Unlike traditional one-way plunger pumps, it can flexibly switch the direction of fluid flow without additional control valves, simplifying the hydraulic system structure, reducing energy loss, and improving the overall efficiency of the system. This feature is particularly suitable for equipment that requires precise hydraulic power output, such as rotary steerable systems, MWD/LWD logging tools, packers, and downhole safety valves in the oil and gas industry, as well as precision hydraulic fixtures and robot joints in intelligent equipment.

3. Compact and Integrated Design, Saving Installation Space

Adopting a miniaturized and insertable structural design, our Bidirectional Plunger Pump can be directly installed on the valve block (valve block), which greatly reduces the overall volume and installation space of the hydraulic system. This design is especially critical for downhole tools, miniaturized hydraulic stations, and portable equipment where space is extremely limited. While ensuring high performance, it effectively improves the integration level of the equipment, reduces the complexity of pipeline connection, and lowers the risk of leakage and maintenance difficulty.

4. High Reliability and Long Service Life, Reducing Operational Costs

We adopt high-quality high-temperature resistant, wear-resistant, and corrosion-resistant materials for the core components of the pump, and strictly control the production and assembly process through rigorous quality inspection standards. The product has excellent wear resistance, anti-vibration performance, and pollution resistance, which can maintain stable operation for a long time in harsh working environments. Its long service life and low failure rate greatly reduce the frequency of equipment maintenance, replacement, and downtime, thereby reducing the overall operational and maintenance costs for customers and improving the efficiency of field operations.

5. Customizable Solutions, Adapting to Diverse Application Needs

We fully consider the differences in working conditions and requirements of different industries and customers. Based on the basic model, we can provide customized solutions according to specific needs such as working pressure (up to 80 MPa), flow rate (0.1–0.8 cc/rev), temperature adaptability, and installation interface. Whether it is for downhole tools in the oil and gas industry, precision testing equipment, or small hydraulic power units, we can tailor the most suitable product program to meet the personalized needs of customers.

Bidirectional Switching Mechanism (Core of Bidirectional Operation)

The key to the bidirectional plunger pump's ability to switch flow direction lies in the intelligent control of the bidirectional control valve group and the matching design of the drive mechanism, which mainly has two common implementation methods, both ensuring smooth switching without additional external valve components:

- Valve Group Switching Control: The bidirectional control valve group is equipped with two sets of symmetric inlet and outlet valves, which are controlled by an electric signal or hydraulic signal. When the flow direction needs to be switched, the control system sends a signal to switch the on-off state of the valve group-closing the original inlet and outlet valves and opening the symmetrically arranged valves. At this time, the suction and discharge channels of the pump are reversed, and the plunger's reciprocating motion will realize fluid delivery in the opposite direction. This method has the advantages of fast switching speed and high control accuracy, suitable for scenarios requiring frequent direction switching, such as downhole servo control tools.

- Drive Direction Reversal: By changing the rotational direction of the drive motor (or crankshaft), the reciprocating direction of the plungers is reversed. When the motor rotates forward, the plungers complete the "suction-discharge" cycle in one direction; when the motor reverses, the plungers move in the opposite direction, and the suction and discharge strokes are reversed, thereby realizing bidirectional fluid delivery. This method is simple in structure and high in reliability, suitable for scenarios where the direction switching frequency is not high but stability is required, such as large-flow bidirectional hydraulic power units.

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.

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