Coil Tubing & Fluid Pumping

  • Clean Outs
    • Fluid Based
    • Foam
    • Energized fluid
  • Reverse Circulation
  • Fluid Swab-Out
  • Wel killing
  • Pressure Control
  • Pressure Testing
  • Stimulation
  • Cementing

Coil tubing clean outs are used to clean debris and/or particulate from well bores. The fluids can be water or hydro-carbon based and mixed with nitrogen if required. Most clean-outs are done with a simple bottom-hole assembly consisting of:

  • Connector
  • Double check valve
  • Wash nozzle

Wash nozzles are offered in many different configurations depending on the actual job and preference.Other options for clean out tools include:

  • Mandrel by-pass tools
    • When gas lift mandrels are included in the well completion
  • Packer jumpers
    • When difficulties are encountered when passing through restrictions
  • Positive displacement motor and bits

Reverse circulation can be used in large casings with small restriction in the well-bore above. A special surface rig-up is used. The surface rig up allows for switching direction of flow simply by switching a few valves, and it includes safety pop-off valve to control the annulus pressure. This technique can be applied very effectively and safely in the right circumstances.

Coil tubing is also used for acid stimulation. The coil tubing can be placed across the perforated interval and reciprocated while the acid is pumped. This places the unspent and undiluted acid directly across the interval in question. The acid is not contaminated with well-bore debris when it is placed though coil tubing. Furthermore, the well-bore is not contacted with live acid thereby protecting the production tubing and hardware and saving the acid for the reservoir. The well can be put back on production immediately by jetting the well in with nitrogen pumped through the coil tubing. This reduces the chance that any byproducts precipitate as the acid is spent.

When wells are abandoned or re-completed coil tubing can spot very small volumes of cement very accurately inside the well. The cement is placed as a balanced plug at the exact spot in the well. Perforations can be squeezed and contaminants can be pumped to dress of the top of a plug or to clean out any excess cement inside the well. Hence, less prep work is required to re-complete a well.