2. THINGS WE LEARN.
HSSE(Health Security Safety and Environment)
Essential geological information(explorations).
Drilling operations(offshore).
Kill fluid.
DST Tool.
Offshore drilling cost.

3. HSSE
Health security safety and environment.
Important terms.
Risk-is an uncertain event or condition that if it occurs ,has an affect on
at least one.
Incident-is an unplanned, undesired event that adversely affects
completion of a task.
Near miss-a scenario which ends safely but might well have ended in
disaster.

4. HSSE
How to avoid any risk, incident and near miss.
Report any kind of hazard to the security officer who will take care of it.
Inform your working collie if you observe the risk situations.
Intervene and give help to your fellows.
Follow the working procedures.
 Frequent check up of the equipment before using .
For the occurred incident, we do investigations to find the main course
and correctness of the incident so that it will not happen again.
OICC-Observation Intervention compliant and collaboration .That's how BG
group works to great a better working condition

5. KILLING FLUID.
Killing fluid(drilling fluid)-is the special mixture of fluid prepared for
drilling operation and well completion.
Types of drilling fluid.
WBM(water based mud).
OBM(oil based mud).

6. KILLING FLUID.
How to prepare drilling fluid(OBM).
Oil based composition.
Oil.
Viscosities.
Filtration control materials
Weight material(densifiers).
Alkalinity.
Bridging materials.
Brine.
Emulsifier.

7. KILLING FLUID.
Mud test.
Mud weight.
We use pressurized mud balance to know the density of the mud in ppg(pound per
gallon).
Rheology.
This is done to study the behaviour of the mud at the well during drilling operations.
With the use of the viscometer we know how drilling fluid behaves.
Chemistry of the drilling fluid.
BAD test-used to test if water contains other chemicals.
Alkalinity.
Chloride content.
Calcium content.

8. KILLING FLUID.
Calculations.
Oil water ratio(OWR).
Percentage water.
Percentage oil.
Percentage solids.

9. KILLING FLUID
Mud plant.
Facilities.
Cello
Cutting bottle.
Pumps.
Key side( manfold).
Dust collector.
9
MUD
PLANT.
Preparation
of additives
Storage of
additive &
prepared
mud.
Delivery
and
discharge
Mud tests

10. DRILLING OPERATIONS
Rig move and preparation.
To put the drilling ship in position.
Satellite reference.
Reference at the ground(use of hangles).
Dynamic position 3D.
Problems
Loose power(blackout).
Wind movement.

11. DRILLING OPERATION
Well schematics.

12. DRILLING OPERATION
First phase drilling.
Drilling fluid is sea water.
To the depth of about.
Run surface casing and cementation.
Installation of well head, run BOP and riser and test.
BOP is very essential as the backup during drilling activities.

13. DRILLING OPERATION
Second phase drilling.
Mud (OBM).
BHA, the drilling bit is small compared to the first phase drilling.
Casing(conductor casing) and cementation.

14. DRILLING OPERATION
Drilling hazards.
Num Hazard Remarks
1 seabed Slope should be 1.2degree.
Check if it is soft or hard .
2 Loss circulation Control the mud weight
3 Hard drill Side track
4 Fault crossing Side track
5 kicks Check the mud condition if the
kick is low.

15. DRILLING OPERATION
Pressure control.
Formation pressure.
Hydrostatic pressure.
Pressure condition
Overpressure.
Balanced pressure.
Under pressure.
Note; always we drill in overpressure condition.

16. WELL EVALUATION.
Drill stem testing.
Definition;
is the method of gathering data on the potential productivity of a reservoir before
installing permanent completion string, where conducted in open or cased well.
DST is primary used to;
Isolate the target zone.
Control well flow.
Convey fluid to the surface.
Acquire down hole data.(pressure and temperature).
Note; DST tool is run once hydrocarbons is detected on the cuttings at the surface.

17. WELL EVALUATION
Down hole pressure that affect down hole testing.
Cushion pressure(Pc).
Formation pressure(Pf).
Hydrostatic pressure(Ph).
Pc<Pf<Ph during down hole testing
DST can be run in a open or cased well.

18. WELL EVALUTION
Important tools.
Tubing.
Valves(testing valve and circulating valve)
Perforating gun.
Packers.
Drill collar.
Radioactive sub.
Surface read out.
Reference tool.

19. WELL EVALUTION.
Principle working.
General steps for ending down hole test are as follows.
Open the reversed circulating valves .
Flush (reversed circulate out) hydrocarbon from drill pipe or tubing.
Close the reversing valves.
Open the tester valves.
Pump mud into the test string to kill the tested interval.
Unseat the packers.
Pull the string out of the well.

20. OFFSHORE DRILLING COST.
Cost categories.
20
OFFSHORE
COST
MATERIALS
EQUIPMENT
INSTALLATION
CERTIIFICATION
CONTINGENCY
PROJECT
MANAGEMENT
ENGINEERING
FREIGHT
MANUFACTURE

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