LodRag Herramienta de perforacion LODRAG in few words: Mechanical Friction- and Wear-Reduction Centralizer System developed by WEATHERFORD

Weatherford developed the LoDRAG system as a centralizer as well as an axial drag friction-reduction system to perform independently of contact area of the rollers with the casing or borehole wall functions exceptionally well in under-pressured conditions, where risk of differential sticking is high.

LoDRAG tools have been used extensively to run sand-control screens into unconsolidated sandstone reservoirs, where the use of clean, to mechanical friction reduction. Using LoDRAG tools in these reservoirs can reduce axial drag by up to 60 percent. The LoDRAG tools can reduce axial friction in cased holes by greater percentages, and are routinely used on ultra-long casing and liner strings. Use of the LoDRAG system has contributed to many record-length wells.

Applications of LODRAG

The LoDRAG tools provide optimal performance when:

  • Casing, liner, and screens are being run into horizontal and extended-reach wells;
  • Centralizer wear may compromise the cement job;
  • Health, safety, and environmental (HSE) requirements ban the use of oil-based and pseudo-oil-based mud;
  • Under-pressured formations may cause differential sticking;
  • Run in conjunction with high-strength stop collars.

Features, Advantages and Benefits of LODRAG:

  • The LoDRAG’s steel rollers help to avoid plowing through well bore material that has settled on the low side of the hole that often creates major drag problems in deviated and horizontal wells.
  • Precision-machined inside diameter fits over the casing through the complete API tolerance range, providing excellent rotational performance in mud.
  • When running casing through open hole, the system’s smaller roller-contact area reduces the risk of differential sticking and maintains standoff.
  • Rollers provide superior wear resistance and have been proven to remain functional throughout the life of the well and can aid in casing/tubing retrieval.
  • The roller/axle relationship ensures that axle shear stresses remain within elastic limits, preventing permanent deformation.
  • Axles are crimped in place, eliminating the welding process, while ensuring the rollers cannot break free and fall into the wellbore.
  • The system’s high-quality construction materials improve high-pressure/high-temperature capabilities.


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