Drill String Accessory Rentals
Supporting your rental equipment needs, Workstrings® offers a full inventory of drill string accessories and downhole tools.
Your Global Drill String Rental Fleet, Ready to Deploy
With strategic stocking locations worldwide and a presence in 90 countries, Workstrings has the capabilities and international shipping expertise to expedite your solutions.
Bit Subs
Bit Subs are essential connectors that join the drill bit to the bottom hole assembly (BHA), typically featuring a box-by-box (female-female) connection. They are often bored to accommodate a float valve, which helps control backflow up the drill string to the rig floor, ensuring safe and efficient operations.
Casing Crossover and Swages
Manufactured to meet rigorous industry standards, our Casing Crossovers and Swages ensure seamless transitions between different types of casing, sizes, and thread connections—for efficient and reliable well construction.
Crossover Subs
Crossover Subs provide an effective solution for mismatched drill string connections, seamlessly bridging differences between components like drill collars and drill pipe. Designed to enhance operational reliability and performance, these subs ensure smoother, uninterrupted drilling operations.
Drifts
Our Drifts are essential tools for detecting raised metal, cement, or other obstructions in drill pipe joints. Available in lengths from 2’ to 4’ and sized 1/8” smaller than the tool joint ID, they come in durable steel or Teflon options, the latter designed to protect internally coated pipe.
Float Subs
Float Subs are designed to prevent backflow from moving up the drill string to the rig floor. Similar to Crossover Subs, they can feature matching connections on each end. The box end is bored to house a float valve within its inside diameter, enhancing flow control and operational safety.
Pump In Subs
Pump-In Subs enable efficient fluid injection into the drill string, featuring a 1502 Weco® connection on the box, pin, or side of the sub, with drill pipe connections on the opposite ends. This versatile design supports seamless integration into drilling operations.
Pup Joints
Pup Joints, available in lengths from 2’ to 25’, are shorter versions of standard drill pipe or tubing. Designed with a reduced inside diameter to match the tool joint, they provide flexibility and precise length adjustments within the drill string.
Top Drive Saver Subs
Our Top Drive Saver Subs are designed to protect the top drive from wear and costly repairs. Featuring a pin-by-pin configuration, they enable multiple make-up and break-out connections with the sub instead of the top drive itself, enhancing durability and operational efficiency.
Valves
Lower Kelly Valve
Our Lower Kelly Valve provides essential flow control on the drill string, preventing mud from rising from the formation to the rig floor. Designed to be quickly inserted into the drill string, it enables controlled opening to pump mud downhole as needed, ensuring safe and efficient operations.
IBOP
The Inside Blowout Preventer (IBOP) is a check valve that controls flow from within the drill string’s internal diameter. Designed for easy insertion into the drill pipe, it can be removed once the well is under control or left in place—without a releasing tool—to permit downflow only, enhancing well control and safety.
Full Opening Safety Valve
A Full Opening Safety Valve is a durable ball valve designed to stop flow in the drill string during withdrawal from a well, ensuring well control and operational safety. Built to withstand high pressure from both directions, it is compact, strong, and easy to handle.
Your Global Rental Fleet for Drill String Accessories
From international shipping challenges to compliance issues, our global team has the equipment and resources to meet your highest operational expectations.