Gajendra Singh(ONGC Trainning Presentation)

8/3/2019 Gajendra Singh(ONGC Trainning Presentation)

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Malaviya National Institute ofTechnology,Jaipur

Presented by:-

Oil and natural gas corporation ltd.Mehsana

Gajendra Singh

2008UCH125

Presented to:-Dr. Madhu AgarwalDept. of ChemicalEngineering


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Contents

Intro

The Organization ONGC Ltd.

Group Gathering Station.

Oil Exploration Process

Heater Treater Central Farm Tank (CFT)-santhal

Santhal GCS

GCP (gas Compreesion Plant)

ETP (Effluent Treatment Plant)

EOR Techniques

In-situ Combustion Process


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Intro The Organization ONGCLtd.

It is a Navaratna Public Sector Unit.

It was set up on 14 August 1956.

It is a Fortune Global 500 company ranked152nd.

Indian government holds 74.14% equity stake

in this company.


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Intro The Organization ONGCLtd.

Contributes 77% of India's crude oil

production and 81% of India's natural gas

production.

It produces about 30% of India's crude oil

requirement.

It produced 27 MMT Crude Oil and 26 bcm

Natural Gas in 2009-10.


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Intro ONGC Ltd. Mehsana

First well was drilled in 1964

Mehsana project was started as anindependent project in1967

Mehsana project is well known for heavy oilbelt, characterized by high viscosity crude

1500 wells at present.

Production is 6200 tones crude oil per day.


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OIL PRODUCTION PROCESS

The production of oil is being obtainedfrom three types of wells:

1. Self Driving.

2. Artificial liftI. 1. Sucker Rod Pumping.

II. 2. Gas Lifting.


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Sucker Rod Pumping.


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Gas Lifting

Reduction of the fluid density and thecolumn weight

Displacement of liquid slugs by large

bubbles of gas acting as pistons. Expansion of the injection gas so that

it pushes ahead of oil


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Group Gathering Station


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HEATER TREATER

Separate Water from oil.

Temp. 80-85deg. C

Chemical dosing

Polar Chem (Demulsifier).


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Electrical Section

Coalescing

Waterdroplet

Dipole


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-SANTHAL


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an a as o ec onStation)

Functions :

To collect natural gas from wells

To collect gas from GGS

To send gas to GCP.

To send compressed gas (CG) to GGS for artificial Gas lifting.

To send CG to IFFCO,RIL, etc


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Gas AnalysisCOMPOUND MOL%

Methane(CH4) 87.150

Nitrogen(N2) 0.160

Carbon di oxide(CO2) 1.36

Ethane(C2H6) 5.22

Propane(C3H8) 2.5

Water(H2O) 0

Hydrogen bi sulfate(H2S) 0

Carbon monoxide(CO) 0

Oxygen(O2) 0

I-butane 1.35

N-butane 0.82

I-pentane 0.36

N-pentane 0.39

Hexane 0.68

Heptane 0

Octane 0

Nonane 0


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Santhal GCS flow diagram


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Scrubber

Remove particulates and gases fromindustrial exhaust streams.

Inject a dry reagent or slurry into a dirtyexhaust stream to scrub out acidgases.

GasStream

Hydratedlime andSoda ash

SO2and HClremoval


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GCP(Gas CompressionPlant) Function :

To compress gas at high pressure.

Suction Pressure : 4 kg/cm2

Discharge Pressure : 40 kg/cm2


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Process Flow Diagram Of GCP-

Santhal


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ETP (Effluent TreatmentPlant)

Objectives

The main objective of this plant is to collect

effluent from various GGS and CTF and totreat that water.

Finally the treated water is sent to waterinjection plant


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EFFLUENT TREATMENT PLANT (ETP)-II(SANTHAL)


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Clariflocculator

It consists of Big cylindrical tank with a hollowcylinder inside.


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(EOR)

The variety of methods and techniques, which permits therecovery of higher percentage of original oil in place than,would have been possible using only primary recoverymethod.

SELECTION OF EOR TECHNIQUES:

Reservoir size, geometry.

Types of reservoir drive.

Viscosity of oil at reservoir condition.

Depth of oil reservoir.


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EOR TECHNIQUES

Steam Stimulated

Steam flooding

(including hot water injection)

IN-SITU Combustion.


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-PROCESS

Continuous injection of air and water

The heat is generated within thereservoir (in-situ) by burning a portionof the oil.

Improving oil mobility by reduction ofthe viscosity of the oil

Two types of ignition process

I.

Spontaneous ignitionII. Artificial ignition


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1. SPONTANEOUS IGNITION

The reservoir temperature must begreater than 180F and the oilsufficiently reactive.

The air is simply injected in acentrally located well.


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2. ARTIFICIAL IGNITION

When the temp. less than180F.

The ignition accessories are loweredalong with a thermocouple wire into

the sand face Ignition accessories are usually

induced using down-hole gas

burners, electric heaters Pyrophoric agent(such as linsseed

oil)


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IN-SITU COMBUSTION PROCESSES

1. Dry Combustion

2. Wet Combustion


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Dry Combustion

In this process, air is first injected into aninjection well then, the oil in the formation isignited.

C


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Wet Combustion

In the dry combustion process, much of theheat generated during burning is stored inthe burned sand behind the burning front

and is not used for oil displacement. The injected water absorbs heat from the

burned zone, vaporizes into steam, passesthrough the combustion front, and releases

the heat as it condenses in the coolersections of the reservoir

Resulting in faster heat movement and oil

displacement.

Ch i l R ti A i t d


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Chemical Reactions Associated

with In-Situ Combustion

1. low temperature oxidation (LTO)-Temp. below 400 deg. F .

2. High temperature oxidation (HTO)-

above 650 deg. F3. The Pyrolysis Reactions.I. Dehydrogenation,

II. Cracking and

III. Condensation of aromatic compounds(benzene and other ring compounds)


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THANK YOU

Gajendra Singh(ONGC Trainning Presentation)

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