it is a benficial slide who wants to know about the drilling fluids and the rhelogical aspects of the drilling fluids. the things are clear and very clear in this slide and this slide is very beneficial for the one who know basics of drilling fluids in a knowledgeable way

1. VOCATIONAL TRAINING SEMINAR
BY :SHIKHA THAPA
BTECH FINAL YEAR
CHEMICAL ENGINEERING
INSTITUTE OF TECHNOLOGY
GURU GHASI DAS UNIVERSITY
TRAINING TAKEN AT
ONGC ACADEMY,DEHRADUN
2015
PROJECT CO-ORDINATOR
DR. R.K. MITTAL
CHIEF GEOCHEMIST
ONGC ACADEMY, DEHRADUN

3.  About ongc
 What is drilling fluids?
 Complete process of circulation of d/fluids
 Functions
 Categories
 Selection criteria
 Properties of d/fluid

4. HISTORY
 Set up under the leadership of Pandit Jawaharlal
Nehru
 Pandit Nehru reposed faith in Shri Keshav Deva
Malviya who laid the foundation of ONGC in the
form of Oil and Gas division, under Geological
Survey of India, in 1955.

5. Oil and
natural gas
directorate
Oil and
natural gas
commission
1956
Converted
to
Corporation
1994
Crowned as
navratna
1997
Then
maharatna
2010

6. ONGC is an multinational company with headquarters in dehradun .psu
under the oil and natural gas ministry
72% contribution to India’s total production of crude oil and 48% of natural
gas. ONGC has established more than 7 Billion Tones of in-place
hydrocarbon reserves in the country.
produces more than 1.27 million Barrels of Oil Equivalent (BOE) per day.
It also contributes over three million tons per annum of Value-Added-
Products including LPG, C2 - C3, Naphtha, MS, HSD, Aviation Fuel, SKO etc.

7. 68.94% equity stake
Operating 26 sedimentary basins and 11000km pipeline .
International subsidy ongc videsh doing projects in more
than 20 countries
discovered 6 of the 7 commercially producing oil basins.

8. Chemical decay
microorganism
Time
Crude
oil

9.  Drilling fluid is used to
aid the drilling of
boreholes into the
earth. Often used while
drilling oil and natural
gas wells and on
exploration drilling rigs

12.  Remove cutting from wells
 Suspend and release cutting
 Control formation pressure
 Seal permeable formations
 Maintain wellbore stability
 Minimizing formation damage
 Cool, lubricate and support the bit and drilling assembly
 Transmit hydraulic energy to tools and bit
 Ensure adequate formation evaluation
 Control corrosion(acceptance level)
 Facilitate cementing and completion
 Minimize environment effect

13. Drilling
Fluids
Water based
mud
Dispersed
Non
dispersed
Oil based
mud
Synthetic
based mud
Pneumatic
drilling fluids
Air or gas
only
Foam

14.  Viscofiers and filtration loss reducers
Bentonite,attapulgite clays,asbestos,CMC etc.
 Weighting material
Calcium carbonate, barytes, hematite, galena etc.
 Salts
NaCl, KCl, CaCl2
 Thinners
Chrome lignosulphonate, cutch, modified tannins
etc.
 Chemicals for pH control
Caustic soda, lime, soda ash etc
 Other chemicals
PHPA, sulphonated asphalt,drilling detergent etc.

15. compositio
n
Quantity Mass(kg) Volume (L) %mass %volume
Water 1bbl 159 1588.99 65.33 84.92
Bentonite 20ppb 9.1 9.07 3.73 4.87
Caustic
soda
0.5ppb 0.23 0.22 0.9 0.12
Soda ash 0.5ppb 0.23 0.10 0.9 0.5
High
viscosity
cmc
1.5ppb 0.68 0.47 0.28 0.25
Low
viscosity
cmc
3.5ppb 1.59 1.09 0.65 0.98
Barite 160ppb 72.58 17.28 29.82 9.23

16.  Formation pressure
 Formation temperature
 Lithology
 Connate water encountered during drilling
 Availability of soft water
 Economics

17.  Density(specific gravity):mud density is used for providing hydrostatic
pressure to control well for drilling
 Viscosity define as internal resistance to fluid flow
o Funnel viscosity : it is time , in seconds for one quartz of mud flow
through a marsh funnel which has a capacity of 946 cm3.
o Plastic viscosity: plastic viscosity is derived from the 600 rpm reading
minus the 300 rpm reading and PV is in centipoise . A low PV of mud is
capable of drilling rapidly.
 Yield point :physical meaning is the resistance to initial flow or the stress
required starting fluid movement. Calculated from 300rpm-600rpm
viscometer dial reading by subtracting PV from the 300 rpm dial . Its the
ability to lift cutting .
 Filtration loss :it determines the rate at which the fluid is forced from the
filter press containing the mud sample under specified conditions of
pressure and time
 Ph :this value tells the acid of drilling fluids
 Gel strength: The gel strength is the shear stress of drilling mud that is
measured at low shear rate after the drilling mud is static for a certain
period of time . its is the ability of fluid to suspend fluid while mud is in
static condition.

20. FOR YOUR COOPERATION