TITLE OF I.D.P.

System improvement of drilling RIG.

GOVERNMENT ENGINEERING COLLEGE, BHARUCH.

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.

THERE ARE NUMBER OF DEPARTMENT AT ANKLESHWAR ASSETS, THEY ARE

1)Administration2)Drilling zone3)Electrical dept.4)Transportation dept.5)Accounts6)Civil dept.7)Labour8)Logging dept.9)Planning dept.

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.

DRILLING TECHNOLOGY

o Rig – The drilling unit to drill a well called ‘RIG’.

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.

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 rigsConvectional 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 platformFloating

 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.

SYSTEM OF AN OIL RIG

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

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.

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

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.

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 .