All problems occur during drilling

All problems occur during drilling


a lot of problems occur during drilling which cause alot of Troubles
:and heavy losses in lives and money such as


LOST CIRCULATION*

KICKS AND BLOW OUT*

STUCK PIPE-
Differential stuck-
Mechanical stuck-
key seat-

CROOKED HOLE*

JUNK IN HOLE*

DRILL PIPE CORROSION*

Hole Deviation*

Mud Contamination*

LOST CIRCULATION


lost circulation is defined as loss of drilling mud during drillingLprocess as the result of change of pressure during drilling

There are three levels of lost circulation which are seepage loss, partial loss and total loss

Causes

 When the hydrostatic pressure is greater than the formation pressure

Most common in soft formation and high formation permeability

When sudden increase in mud weight which increase hydrostatic pressure than formation pressure

Poor cleaning of cutting during drilling which increase hydrostatic pressure

Prevention

Keep hydrostatic pressure is near from formation pressure or great with small value

Use proper mud weight

Maintain adequate hole cleaning

Results

loss of drilling mud in the formation

loss of production

some time rig fire


KICKS AND BLOW OUT

A kick know as an entry of formation fluids oil ,water or gas into the well bore caused by the
formation pressure exceed the mud or hydrostatic pressure by the mud column

kick occur when the formation pressure is greater than the hydrostatic pressure

Causes

    Loss of hydrostatic head during drilling due to lost circulation

Use not proper drilling fluid with poor properties

Insufficient mud weight

Prevention

Use proper mud weight

Keep hydrostatic pressure is near from formation pressure or great with small value

Use blow out preventer in suitable time


Results

Fire and die all crew in rig

Some problems in drilling rig

STUCK PIPE 
There is three type  of stuck

Differential stuck-
Mechanical stuck-
key seat-

Differential stuck

  Differential stuck occur as a result of  differential pressure between hyrostatic pressure and formation pressure 

Mechanical stuck

 Mechanical stuck occur as a result of accumulate cutting during drilling around the bit as a result of not good cleaning of hole

Differential sticking there is a circulation but there is no a rotation Mechanical sticking there is no  circulation and  rotation

CROOKED HOLE

Indication

Stuck in drilling string

Casing problems

Causes

Use much weight on bit

Not use an stabilizer during drilling

Use small drill collars


All problems occur during drilling All problems occur during drilling Reviewed by petroleum club on December 02, 2016 Rating: 5
Theme images by enot-poloskun. Powered by Blogger.