3. ONGC ANKLESHWAR ASSET
The 1st exploratory test well Ankleshwar#1 was spudded
–in on 25th February 1960 with Russian rig URALMARSH-5D. The
first producing well of ONGC was christened as ‘VADODARA’ on
23rd June 1960.
Ankleshwar assets cover three district of Gujarat viz.
Baroda, Bharuch, & surat. The operational activities of asset are
spread over 5100sq.kms.
• Ankleshwar assets has 10 Drilling rigs.
• Ankleshwar assets has 15 work over rigs.
4. THERE ARE NUMBER OF DEPARTMENT AT
ANKLESHWAR ASSETS, THEY ARE
1) Administration
2) Drilling zone
3) Electrical dept.
4) Transportation dept.
5) Accounts
6) Civil dept.
7) Labour
8) Logging dept.
9) Planning dept.
5. EXPLORATION :
In ordered to carry out the exploration in a new area
a set of activities to be done technically which are known as
the various stages in petroleum exploration.
THE DIFFERENT STAGE IN OIL/GAS EXPLORATION
AS FOLLOWS:
1) Pre study of prospecting area.
2) Propose mining right negotiation.
3) Acquisition of mining right.
4) Geological surveys, remote sensing.
5) Gravity, magnetic surveys.
6) Seismic surveys.
7. Drilling Rig – A drilling rig is a machine which
creates holes usually called bore holes in the
ground.
Drilling rig can be massive structure housing
equipment used to drill water wells, oil wells or
natural gas extraction wells.
8. Based on the special requirement and
application, RIG may be classified as:-
1) ONSHORE RIG: Rigs are used for drilling on land.
These can be further sub-classified as:
Mobile rigs
Convectional rigs:
2)OFFSHORE RIG: rigs which are used for drilling in
water e.g. sea, lake, pound, river etc. These can be
subdivided as :
Fixed platform
Floating
9. PREPARING TO DRILL
Once the site has been selected, the crew goes
about preparing the land:
1) The land is cleared and levelled.
2) Access roads may be built.
3) Because water is used in drilling, there must be a
source of water nearby. If there is no natural source,
they drill a water well.
4) They dig a reserve pit, which is used to dispose of
rock cuttings and drilling mud during the drilling
process, and line it with plastic to protect the
environment.
11. SYSTEM OF AN OIL RIG
1.MAST-it is a metal structure which support all rig equipment.
Height of mast is 52m,
2. Power system
Large diesel engines - burn diesel-fuel oil to provide the
main source of power. It is directly connected to alternator
through coupling to generate electric power to operate rig..
Specification
Make- Cummins India limited, pune.
Model no-KTA-50-G
Power-1200HP at Speed of 1500rpm
Idle speed- 1080-1120rpm
Alternator-1430kva
12. 3. HOISTING SYSTEM :
Hoisting is used to lifting heavy load of drill string
which consist of drill pipe, drill collar, Kelly, swivel
through out draw works & traveling block.
4. ROTATING EQUIPMENT :
• Rotary table : A rotary table is a mechanical device on
drilling rig that provides clockwise & anticlockwise
rotational force to the drill string.
• Drill Bit :The drill bit is located at bottom of the drill
string. It is used to backing up the rocks and sediment.
13. There are two types of drill bit :
1.Poly Crystalline Diamond bit
size-17 ½”,12 ½”,8 ½”.
2. Diamond bit
5.CIRCULATION SYSTEM
Circulation system
Required to circulate drilling
Fluid at high pressure which consist of :
1. Mud pump
Maximum capacity : 3500 kg/cm².
2. Drill Pipe- O.D.- 0.386m, I.D.- 0.54m, Length – 9.2m.
6.Mud cleaning system- ingredient of drilling fluid is costly so that it is
reticulated in to the well.
There are three equipment used for cleaning
Shale shaker
Desander
Desilter
PDC
14. IDP(INDUSTRY DEFINED PROBLEM)
In ONGC rig, there is needed of 1 crane to put pipe from
catwalk to pipe ramp. Also there is need of three operator to
perform the same operation, in which one operator is used to
operate the crane and two operators are used to hang the pipe
in travelling block of crane.
15. There is total cost of Rs 15,000/month for crane
maintenance and for worker salary.
There is already an air compressor at rig, which is
used to operate “Diesel engine air starter motor” and
to operate “Pneumatic crane” for hanging the pipe on
derrick .
