1fiiui- i—mw uoesi.asinjecuonvvorK- How Does Gas Injection Work? U R L: http:Ilwww. riqzone.com/training/insight.

asp?i id=345 Typically,

a well will produce

at its highest production

rate

at the beginning

of the production

cycle;

and then production

will wane.

In an effort

to increase production

from both

oil and natural

gas wells, secondary production methods

are employed.

A type

of Enhanced

Oil Recovery (EOR), secondary production includes water flooding

and gas injection. Secondary Production:

Gas Injection Secondary production methods

are employed

to increase production

by boosting depleted pressure

in

a formation. As the

oil or natural

gas

in

a formation

is produced,

the hydrocarbons remaining

in the reservoir

may become trapped because

the pressure

in the formation

has lessened, making production

either slow dramatically

or stop altogether. A form

of secondary production,

gas injection

is used

on

a well

to enhance waning pressure within

the formation. Systematically

spread throughout

the field, gas-injection

wells

are used

to inject
gas and effectively
sweep

the formation

for remaining petroleum, boosting production. Somewhat
similar

to water injection,

or water flooding,

gas injection

is

a pressure maintenance program

that can
be employed

on

a reservoir

at the start

of the production process

or introduced

after production

has already started

to lessen. Here,

gas

is injected

into the gas cap

of the formation, whereas

in water injection,

the water

is injected directly

into the production

zone. Cycling

in

a Natural

Gas Reservoir Sometimes
known

as cycling,

gas injection

can entail re-injection

of produced natural

gas.

In this instance,

as the pressure
drops

in

a natural

gas field,
the condensate separates

from
the dry gas

in the reservoir.

The condensate liquids block

the pores within

the reservoir, making extraction practically impossible. Cycling

is used

to prevent

the condensate

from separating

from
the natural

gas

in the reservoir.

In this process,

the natural

gas liquids (condensate)

are stripped

from
the gas

on the surface
after

it has been produced

from
the reservoir,

and the dry gas

is then re-injected

into the reservoir through injection wells. Again,

this helps

to maintain pressure

in the reservoir
while also preventing

the separation
within

the hydrocarbon.a._ Gas Injection

& Production WellSource: www.libyaninvestment.comhftn//unAnn,rln,nnornmIfr,,ninn/incinhInfirt,24RIt)11.5iIUl3F-(lLur’4iz-F—lowuoescasinjectionvvoricNaturalGasDisposalSolutionAdditionally,gasinjectioncanserveasaneconomicalwaytodisposeofuneconomicalgasproductiononanoilreservoir.Whileinthepast,lowlevelsofnaturalgasthatwereproducedfromoilfieldswereflaredorburnedoff,thatpracticeisdiscouragedinsomecountriesandagainstthelawinothers.Now,thelowlevelsofnaturalgasthatareproducedfromprolificoilfieldsarere-injectedintotheformationasformofdisposal,aswellaspressuremaintenance.Here,producedwetgasfromoilfieldsarestrippedoftheirnaturalgasliquids,compressedandpumpedintoaninjectionwell.Iftheoilfieldishighlysaturated,thenaturalgasisinjectedinthefreegascap;butiftheoilfieldisunder-saturated,thegasisinjecteddirectlyintotheoilreservoir.GasInjection,GasLift&GasMiscibleProcessAlthoughthetermsaresometimesinterchanged,gasinjectionandgasliftaretwoseparateprocessesthatareusedtoincreaseproduction.Whilegasinjectionisasecondaryproductionmethod,gasliftisatypeofartificiallift.Artificialliftisanotherwaytoincreaseproductionfromawellbyincreasingpressurewithinthereservoir.Themaintypesofartificialliftincludegasliftandpumpingsystems,suchasbeampumps,hydraulicpumpsandelectricsubmersiblepumps.Whilegasinjectionisachievedbyinjectinggasthroughitsowninjectionwell,gasliftoccursthroughtheproductionwells.Ingaslift,compressedgasisinjecteddownthecasingtubingannulusofaproductionwell,enteringthewellatnumerousentrypointscalledgas-liftvalves.Asthegasentersthetubingatthesedifferentstages,itformsbubbles,lightensthefluidsandlowersthepressure,thusincreasingtheproductionrateofthewell.Furthermore,atypeofEORemployedonawellinthetertiaryproductionprocess,agasmiscibleprocesscanbeusedtoincreaseproduction.Thedifferenceinthisrecoverymethodisthatthegasesintroducedintothereservoirarenotnaturallyoccurring.Inagasmiscibleprocess,carbondioxide,nitroqenandLPGareinjectedintothereservoir.boughttoyouby: RIGZJNEFlaringhttnI1,nn,,nn,rin,nnornmlfr,.ininnlincinhlr,fzcn9iir1’4c