What is differential sticking in well drilling?
A condition whereby the drillstring cannot be moved (rotated or reciprocated) along the axis of the wellbore. Differential sticking typically occurs when high-contact forces caused by low reservoir pressures, high wellbore pressures, or both, are exerted over a sufficiently large area of the drillstring.
How do you stop sticking differential?
Preventive actions are as follows:Do not use too high of mud weight.Do not stop moving string for a period of time, especially, when the BHA is across permeable formations.Keep mud properties in good shape. ... Minimize length of BHA if possible.Use spiral drill collar and heavy weight drill pipe to reduce contact area.
How do you release a stuck differential pipe?
Differentially Stuck Pipe can be freed with Nitrogen and a controlled U-Tubing process by lowering the hydrostatic pressure and reducing sufficiently differential forces, allowing the stuck pipe to lift-off and free from the borehole wall – beyond and more effectively than any other conventional methods can deliver.
What is the reason of pipe sticking?
The causes of mechanical pipe sticking are inadequate removal of drilled cuttings from the annulus; borehole instabilities, such as hole caving, sloughing, or collapse; plastic shale or salt sections squeezing (creeping); and key seating.
What is mechanical sticking in drilling?
1. n. [Drilling] The limiting or prevention of motion of the drillstring by anything other than differential pressure sticking. Mechanical sticking can be caused by junk in the hole, wellbore geometry anomalies, cement, keyseats or a buildup of cuttings in the annulus.
What is stuck pipe in oil field?
During drilling operations, a pipe is considered stuck if it cannot be freed from the hole without damaging the pipe, and without exceeding the drilling rig's maximum allowed hook load. Pipe sticking can be classified under two categories: differential pressure pipe sticking and mechanical pipe sticking.
How do you get a drill pipe unstuck?
The solution is to reduce the hydrostatic pressure in the hole until it is equal to the low pressure zone that has you stuck. While circulating, slowly reduce your mud weight by dilution while holding torque on the pipe until it comes free.
What is lost circulation in drilling?
Lost circulation is defined as the total or partial loss of drilling fluids or cement to high-permeability zones, cavernous formations and natural or induced fractures during the drilling or completion of a well.
What is hole deviation?
Hole deviation is the unintentional departure of the drill bit from a preselected borehole trajectory.
What is key seating in drilling?
1. n. [Drilling] A small-diameter channel worn into the side of a larger diameter wellbore. This can be the result of a sharp change in direction of the wellbore (a dogleg), or if a hard formation ledge is left between softer formations that enlarge over time.
How do you remove a stuck pinion shaft?
0:363:03DIY - How to remove a stuck pinion gear from an axle case - YouTubeYouTubeStart of suggested clipEnd of suggested clipTake your pneumatic air punch. So make sure you've got a tapered bit test fit this into the dimpleMoreTake your pneumatic air punch. So make sure you've got a tapered bit test fit this into the dimple that's on the end the most pinions. Or you could try and use a flat.
How do you remove a differential pinion shaft?
4:045:48Removing A Differential Carrier Ring Gear and Pinion from Straight Axle ...YouTubeStart of suggested clipEnd of suggested clipIf you go ahead and I'm using an air hammer and you can kind of hit the yoke at the pinion with theMoreIf you go ahead and I'm using an air hammer and you can kind of hit the yoke at the pinion with the the air handler the yoke kind of less free. Then I'm gonna go ahead and you know hit it a couple
How do you remove a pinion yoke nut?
3:2813:28How to Replace Pinion Seal & Yoke 1994-2004 Chevy S-10 - YouTubeYouTubeStart of suggested clipEnd of suggested clipJust go ahead and use a hammer. And very carefully tap along this area here and try to drive thisMoreJust go ahead and use a hammer. And very carefully tap along this area here and try to drive this off just be very careful. So when it comes off it doesn't hit you in. The.
How do you remove the ring gear from a carrier?
1:435:58Removing ring gear - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou can either hit it with a brass drift. Obviously it's a chisel you can hit with the brass drift.MoreYou can either hit it with a brass drift. Obviously it's a chisel you can hit with the brass drift. Here just tap it on each side.