Slimhole Well

Definition - What does Slimhole Well mean?

A Slimhole Well is a type of a gas or an oil well whose borehole size is significantly smaller than the usual borehole size. It is generally less than 6 inches in diameter and 4 ¾ inches or less deep. It is drilled by E&P organizations. The Slimhole Well sets a perfect correlation between the well cost and the volume of rock drilled out. It goes with a notation that the cost of developing a gas or an oil well will reduce when less rock is extracted.

Petropedia explains Slimhole Well

  • Drilling Slimhole Wells is the most commonly accepted engineering criteria these days within the E&P industry space because it is estimated that the well development cost is reduced by 30% after following this drilling criteria. The small size diameter and shallow deepness has the following advantages:
  • Uses less material in well preparation.
  • Uses less rig hold time.
  • Increases the number of drillings at the same time.
  • Reduces waste mud volumes.
  • Uses less manpower.
  • Saves time in location preparation and many more advantages.

Some of the disadvantages of Slimhole Wells include:

  • ECD (Equivalent Circulating Density) is high which can limit mud weight.
  • It eliminates contingencies.
  • Geophysical information is limited.
  • Production will be for small rates.
  • It limits potential for sidetrack option.

Production rates of up to 50 mmscfd gas, 4000 bpd oil are achievable in many cases through 4 1/8 inch size borehole and 3 ½ inch liner. There are two technologies commonly used for drilling Slimhole Wells, i.e., downsized conventional drilling and continuous coring method

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