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 angels 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.
Used in wells with great degrees of deviation, slant wells and wells
containing internal coated tubing.
The Roller Stem is normally placed midway in the tool string. In some
applications placement is near the top and bottom of the tool string.
After each use inspect the rollers for cracks, wear, or chips.