Undergauge Hole in drilling is a phenomenon that means that the drilled hole diameter is less than the used Drilling Bit diameter. It always happens after the Drilling Bit, and the stabilizer gauges get worn while drilling abrasive rock, so the following section using the same Drilling Bit will produce a less diameter hole or …
We can define Key seating term in drilling as a groove in the hole side made by the Drill Pipe rotating against the borehole wall at the same point and wearing a groove or key seat in the wall. During tripping pipe out of the hole, the Bottom Hole Assembly BHA, Drill Collar, Stabilizer, Mud …
Wellbore Instability Definition Wellbore or borehole instability is the undesirable condition of an open hole interval that does not maintain its gauge size and shape and/or its structural integrity. The Main Causes Of Well Bore Instability: How Unconsolidated Formations Cause Wellbore Instability? An unconsolidated formation falls into the wellbore because it is loosely packed with …
Pack off and Bridge stuck is one of the types of Pipe sticking that may face drilling crew while drilling operations. Our objective in this article is to: Pack Off / Bridge Stuck Mechanism & Definition Drilling Pack Off Mechanism: Small pieces of formation, cement or junk settle around the Drill String preventing circulation with …
If the well is not circulated well and the hole is not cleaned from cuttings properly, they will gather & settle around the Drill String, usually the Bottom Hole Assembly BHA, due to the small clearance between the Bottom Hole Assembly BHA and the hole, which will lead to a stuck probably in the Drill …
Below general good practice steps to avoid general drilling problems encountered during drilling operations Inadvertent Side-tracking (in soft formation) Gumbo (sticky shale) Hole Cleaning Borehole Instability (brittle shale) Lost Circulation (common in drilling carbonate formations) Swelling Shale