Workover, Well Intervention and Well Stimulation

Image referred from Internet

What is basic difference between Workover, Well intervention and Well stimulation ?

Work over is operations of repair and maintenance of well which requires Work over rig or drilling rig or hydraulic work over units.

So, it is term used to describe heavy well maintenance or repairing works.

X mas tree is removed and BOP is installed for workover or well service processes. It is not performed on live wells.(well needs to be killed to perform work over operations)

Work over operations :

1) Water shutt off

2) Gas shutt off

3) Servicing

4) Fishing 

5) Recompeltion

4) Layer transfer

5) Profile modification in injection wells

6) Well deepening

7) Side tracking

8) Long drift side track (LDST)

9) Short drift side track (SDST)

10) Well abandonment and Plugging

Well interventions is term, which is used to describe operations, which doesn't involve rig. So, it is Rigless operation.

So, it is term used for, light duty works of well repair and maintenance.

It is performed on live wells. X mas tree is in place.

Well intervention operations are carried out by the following methods:

• Wireline (both electric line and slickline).

• Coiled tubing.

• Snubbing.

Coiled Tubing

Typical well intervention operations are:

1) Well stimulation

2) Sand control

3) Production logging

4) Scale removal

During workovers, it is probable that well interventions with wireline and/or coiled tubing

are required as part of the work programme to prepare the well for tree removal or establish

production post workover.

Third term is, Well stimulation,

Well stimulation is a type of well intervention operations. It is used to restore or enhance productivity index of well.

It involves two basic operations:

• Hydraulic Fracturing (HF job).

• Acidization.

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