WEATHERFORD WDD 550 Pump

We offer two pump models based on the same powerful power end: the WDD 550, designed for HDD applications, and the QWS550, designed for high-pressure well services such as fracturing.

WDD 550(HDD application) : this pump is equipped with a high durability cast ductile iron hydraulic end with a maximum working pressure of 2,000 PSI and a rated connecting rod load of 21,000 lbs. This configuration perfectly meets the core requirements of HDD operations: continuous, large-displacement fluid circulation to efficiently remove cuttings, and working pressure to fully meet the vast majority of HDD conditions. The cast ductile iron hydraulic end provides superior cost effectiveness while ensuring sufficient strength and excellent wear resistance.

QWS550(high pressure oil well service) : this pump uses a higher strength forged alloy steel hydraulic end to withstand operating pressures up to 10,000 PSI and a connecting rod load of 59,820 lbs, to meet the extreme pressure requirements of operations such as fracturing.

Technical specifications and performance ranges

We provide clear, detailed technical data to help you accurately assess whether the WDD 550 meets your project requirements.

Table 1: Weatherford WDD 550 five-cylinder pump-core technical specification

Table 2: WDD 550 performance ratings (flow vs. pressure)

The following table shows the theoretical performance at different piston sizes and speeds. The data are calculated based on 100% volumetric efficiency and 90% mechanical efficiency. The actual flow rate decreases slightly due to pressure and fluid properties, usually around 95% .

Note: Performance data are based on displacement calculations for the QWS550 pump type, which has the same flow rate as the WDD 550 at the same piston size and speed. The pressure value has been limited to the upper limit of 2,000 PSI for the WDD 550.

Frame structure

The power end frame of the pump is the guarantee of its structural integrity. The WDD 550 uses a high-strength cast iron frame. The graphite sheet microstructure of this material endows the framework with excellent anti-fatigue durability, excellent wear resistance on the moving surface, and excellent vibration absorption capacity, which is beneficial to the development of high-performance composites, provides a solid foundation for continuous operation under harsh working conditions.

Crankshaft and transmission system

The robustness of the power transmission system is directly related to the performance and life of the pump.

Forged alloy steel crankshaft: the crankshaft is forged in one piece of high strength alloy steel to ensure extremely high rigidity and fatigue resistance under maximum load.

Full support and advanced bearings: the crankshaft has a"Full support" design with biconical main bearings and cylindrical roller center bearings. The multi-point support structure can effectively distribute and bear the load, minimize the deflection deformation of the crankshaft in operation, thus preventing premature wear of bearings and fatigue fracture of the crankshaft. This is not just to extend life, but to ensure consistent, predictable performance over thousands of hours of continuous operation, thereby reducing the risk of unexpected downtime.

Lubrication system

The WDD 550 is equipped with a built-in combination of forced lubrication and splash lubrication. The system ensures continuous and adequate lubrication of all critical moving parts such as crossheads, bearings and gears, even under harsh conditions such as low speed or non-horizontal mounting. In addition, the pump is also equipped with a senior four-seal intermediate rod oil seal, effectively prevent mud invasion power end, keep the lubricating oil clean, so as to extend the life of the power end components. For long-term operation below 200 RPM, it is recommended to install an auxiliary lubrication system.

Modular design and materials

The standard WDD 550 hydraulic end is made of high strength cast ductile iron. This material is subjected to rigorous quality control and provides superior durability, wear resistance and cost effectiveness for applications with 2,000 PSI pressure class. The hydraulic end adopts the industry standard"Valve on valve"(L-type) structure, which ensures the high efficiency and reliability of the fluid channel.

Manufacturing process and quality assurance

Although the standard WDD 550 hydraulic end is a casting, the manufacturing process follows the same rigorous quality standards as our forged hydraulic end. All hydraulic end modules must pass a series of rigorous tests such as pressure test, dimension gauge inspection and non-destructive testing (NDT) before delivery to ensure full compliance with industry specifications such as API 7K, avoid any hidden trouble that may lead to on-site failure.

Easy maintainability

We deeply understand the importance of on-site maintenance efficiency. The hydraulic end design of the WDD 550 allows maintenance personnel to"Easily remove the piston from the front end of the cylinder block without moving the entire cylinder or cylinder liner.". This feature greatly simplifies the replacement process, reduces downtime to a minimum, and directly improves your productivity.

Consumables and wear-resistant parts: the Science of Life Extension and TCO reduction

Selecting high-quality, OEM-compliant consumables is the most direct and effective way to reduce the total cost of ownership (TCO) of pumps. Each of our consumables incorporates advanced material science and precision manufacturing techniques designed to maximize uptime and extend maintenance.

Liners

Cylinder liners are the core components that directly withstand the wear and tear of mud. We offer a variety of options to suit different operating conditions and budgets.

Table 3: Comparison of cylinder liner materials and technologies

Pistons and Piston Rods

Pistons: we offer"Premium oil grade" pistons made from high quality polyurethane or nitrile rubber (Nbr) cured with a heat treated forged alloy steel piston core such as 40CR or 45 # steel. Forged piston cores provide superior impact toughness and structural strength to castings, while high-quality polyurethane ensures excellent sealing and wear resistance up to 7,500 PSI pressures20.

Piston rod/intermediate rod: forged from high strength alloy steel (42CrMo) , quenched and tempered for optimum combined mechanical properties. The surface of the rod body is precision ground and hard chrome plated, providing a smooth, wear-resistant and corrosion-resistant surface, ensuring the long-term effectiveness of the seal and the ultra-long life of the rod itself.

Valve Assembly

Valve Assembly is a key component to withstand high-frequency impact and fluid erosion. Our valve assemblies are fully API compliant and manufactured using the following processes:

Material: body and seat are made of high quality forged alloy steel (20CrMnTi or AISI 8620) .

Heat treatment: advanced carburizing and quenching process to form an extremely high hardness layer (HRC ≥60) on the body and seat surface to resist abrasive wear while maintaining toughness at the core, to absorb impact load without fracture.

Valve plug-in: made of high-performance polyurethane or nitrile rubber, with excellent wear resistance, oil resistance and tear resistance.

Core application: horizontal directional drilling (HDD-RRB-

All the design features of the WDD 550-large flow, continuous operation, smooth five-cylinder output, robust power end and easy maintenance hydraulic end-make it an ideal high-pressure pump for large HDD projects. It has been successfully integrated into industry-leading mud recovery systems, such as the KEMTRON 1500 MPX PROTM, providing a reliable power source for the most demanding crossings.

Other potential applications

With its powerful performance and reliable design, the WDD 550 is also suitable for other industrial applications that require high-flow fluid delivery, such as:

Industrial cleaning and descaling

Dust suppression in mines

Hydraulic transport

High-flow water injection operations

OEM original parts and service commitment

To ensure that your WDD 550 pump maintains optimal performance at all times, we strongly recommend using Weatherford original or equivalent standard accessories. These accessories are specifically designed, tested, and manufactured to ensure a perfect fit with your equipment for optimal performance, maximum uptime, and maximum security. Our Global Service Network stands ready to provide you with the technical support and spare parts you need.

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