شرح منطقه الانحراف واسبابها-Crucial Seating In Drilling Stuck
We can define crucial 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 crucial seat in the wall. During tripping pipe out of the hole, the Bottom Hole Assembly BHA, Drill Collar, Stabilizer, Mud Motor, or any big periphery element may sandwich into one of these large grooves, which may be too small for it to pass through. This crucial Seating sticking is likely to be in a soft conformation in directional wells while dropping the inclination. It can also do at the covering shoe if a groove is worn in the casing.
:Where the drilling problem Key seating happen
*At abrupt changes in angle or direction in medium-soft to medium-hard conformation. This abrupt change will make the drill pipes always make a channel in the same postion as drilling continues*Where high side wall forces and Drill String gyration live.
*While pulling out of the hole.
*After long drilling hours with no wiper trips through the dogleg section. As wiper passages will help in smoothing similar crucial seating and will help to RIH and POOH through it with lower probability of Stuck Pipe problem.
Mitigation Measures
The preventative measures depend on keeping any turns or ant angle changes in the wellbore gradational and smooth and enlarging the grooves created by Drill Pipe so that the larger periphery tools as Drill Collar, Heavy Weight Drill Pipe HWDP, nethermost Hole Assembly BHA and the covering strings will pass through it.*First thing to suppose about is the Wiper passages.
*Directional Drillmaster( Check also Driller Job Descriptions) had to make angles and turn smoothlysto drop dogleg inflexibility.
*In the well-conditioned planning phase if you suspect a crucial seating problem, you have to plan for using String Reamers and wipers in Bottom Hole Assembly BHA.
What's the Key Seating Wipers
By releasing the Drill Pipe, the sleeve may be jarred out of the crucial seat. A clutch drive on the bottom of the sleeve and the lower body is engaged by right- hand gyration.
Sluggishly raising the Drill String and continuing gyration allows the sleeve to serve as a Reamer and wipe out the crucial seat. The operation may be repeated to further enlarge the area, therefore permitting free passage of the Drill Collar.
Recognization &Indicators
It's so simple to descry such a problem. from its description, we formerly know that you can anticipate it while POOH with the Drill String, in soft conformations, abrupt change in Inclinations, and azimuth. Below are the main suggestions that you would like to know.*Occurs only while POOH.
*unforeseen overpull as nethermost Hole Assembly BHA reaches dogleg depth.
*Free Drill String movement below crucial seating depth possible if not formerly Stuck.
*Cyclic erratic overpull at Tool Joint intervals on passages as the each Tool Joint keep meeting the crucial seating.
*Large dogleg.
*largely swerved wells.
*Rotation possible.
How To Free This Kind Of Stuck Pipe( Key Seating Type)
*As the Stuck happed while POOH, it's recommended to start applying necklace if possible and Jarring down with maximum available trip cargo.*If you got free launch Back ream with low parameters out of the hole.
*When you're at face it'll be better to start using crucial seating wipers.
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