Slickline Roller Stem

Description

Slickline Roller Stem

Technical Description and Specifications

The Slickline Roller Stem is a specialized bottom-hole assembly (BHA) weight bar engineered to replace standard solid stem in highly deviated, high-angle, or horizontal well sections.¹ Its critical function is to minimize frictional drag and wall contact friction, ensuring the entire tool string can descend by gravity and transfer jarring energy efficiently in challenging wellbore geometries.

Key Technical Specifications and Operation

• Function: To provide the necessary mass (weight) for slickline operations while reducing the surface contact area and friction between the tool string and the tubing wall, allowing tools to reach target depth in high-angle wells.

• Design: Consists of a series of weight bars featuring precisely machined grooves that house hardened, free-spinning roller wheels (or sheaves).⁴ These rollers bear the load and roll along the tubing wall instead of sliding, significantly reducing drag.

• Roller Material: Rollers are typically made from highly wear-resistant materials like stainless steel or hardened specialty alloys to withstand constant rotation and abrasive wellbore contact. Bushings or sealed bearings ensure smooth, low-friction operation.

• Weight Calculation: Roller stems are measured by their total mass, which is critical for overcoming hydrostatic and frictional forces. The weight provided must be sufficient to set down tools and perform jar operations.

• Operational Advantage (Friction Reduction): The reduced coefficient of friction allows the tool string to fall faster and reach greater measured depths in inclined sections (typically ⁶$>45^\circ$ deviation) than standard steel stem.

• Connection (Customizable):

  • Standard interfaces include proprietary slickline pin threads.

  • Custom order connections are available to ensure compatibility with proprietary quick-connect systems (e.g., QLS, HQC) and non-standard tool string threads.

• Material (Customizable):

  • Main Body: High-strength alloy steel (e.g., AISI 4140/4340).

  • Custom material options are available, including NACE MR0175 compliant alloys (e.g., specific stainless steels) for sour service and specific, low-density materials for the roller housings to maximize the magnetic permeability if required for specialized logging.

• Critical Parameters (Customizable Weight and Roller Count):

  • Total Mass/Length: Available in custom lengths and steel grades to achieve a specific target weight (in lbs or kgs).

  • Roller Design: Can be customized with a specific number and diameter of rollers to optimize contact area for extremely large-diameter tubing or specialized landing profiles. Clients must specify the required weight, tubing ID, and well deviation angle when placing a custom order.

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Secondary: Wireline Roller Sub, Roller Wheels BHA, Horizontal Well Stem.