What is a Roller Stem?
A Roller Stem is a device that is used to carry out operations in deviated well bores. It helps in reducing friction against tubing walls when compared to conventional stem bars in these situations. The roller stem has sinker bars with milled slots to accommodate roller wheels and are available for a wide range of tubing sizes. A Roller Stem is made up in short sections usually two feet in length with upper and lower thread connections. The slots are cut at staggered angles along the length of the body. Rollers are mounted in the slots with the use of a roller shaft placed at 90°. The rollers used have an outside diameter larger than the body of the roller stem. This allows the tool string to have a gliding effect.
Applications
- Used in wells with great degrees of deviation, slant wells and wells containing internal coated tubing.
Key Features & Benefits
- The stem accommodates multiple-sized, interchangeable rollers, allowing flexibility for various wellbore sizes or specific applications.
- The freely rotating rollers minimize friction during tool string movement.
- The roller stem assists in smoothly conveying the tool string in high-angle deviated wells.
