Introduction to Gas Lift

8/10/2019 Introduction to Gas Lift

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Gas Lift - Design 1

Teknik Produksi Lanjut

PERENCANAAN DAN ANALISIS PRODUKSIARTIFICIAL LIFT WELLS


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Gas Lift - Design 2

PendekatanNodal System Analysis

Gas LiftPerencanaan

Analisis Stability

Electric Submersible PumpPerencanaan Analisis Gas masuk ke Pompa

Sucker Rod Pump

Perencanaan Analisa Beban Analisis Gas masuk ke Pompa


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Gas Lift - Design 3

GAS LIFT WELLSPerencanaan


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Gas Lift - Design 4

Pendekatan Pemahaman

Pemahaman SistemTujuan Gas LiftSistem Sumur Gas Lift

Komponen-Komponen pada Sumur Gas LiftPemahaman Operasional

Kemampuan Produksi SumurBatasan-batasan Operasional

Pengaruh Batasan Operasional terhadap DesainPemahaman Desain Instalasi Sumur GasLift


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Gas Lift - Design 5

Pemahaman Sistem Gas Lift Well

Tujuan Gas LiftMeningkatkan produksi sumur dengan :

mengurangi gradient tekanan aliran dalam tubingdengan menambahkan gas pada tubing.

ataumembentuk kolom gas dalam tubing yang akanmendorong kolom fluida dalam tubing

dengan mempertimbangkan kemampuan

lapisan produktif, kemampuan penampunganproduksi di lapangan, gas yang tersedia untuk

diinjeksikan serta kemampuan sarana injeksidi permukaan dan dibawah permukaan


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Gas Lift - Design 6

Sistem Sumur Gas Lift

Gas Injection Line

Pt

P c

Compressor Subsystem intake system outlet system choke pressure gauge injection rate metering

Flow Line

Separator

Wellhead Subsystem : Production subsystem

wellhead production choke pressure gauge

Injection subsystem injection choke

ValveSubs

ystem Wellbore Subsystem: perforation interval tubing shoe packer

Separator Subsystem: separator manifold pressure gauges flow metering

ALL THE SUBSYSTEMS AREWELL CONNECTED

(INTEGRATED SYSTEM)

Gas Lift Mandrells

Gas Injection Valve


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Gas Lift - Design 7

Parameter pada Sistem Gas Lift

Parameter Tekanan Tekanan discharge compressor Tekanan injeksi di wellhead

Paremeter Injection Rate Laju injeksi gas

Paremeter Production Rate Inflow Performance RelationshipParameter pressure drop


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Gas Lift - Design 8

Parameter pada Compressor

D Pgas

Compressor

Wellhead

Separator

P intake P discharge

Horse PowerCompressor

P injection @wellhead

P injection @wellhead=P discharge - D P Q gas

Qgas

Wellhead


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Gas Lift - Design 9

Parameter pada Compressor

Tekanan intake :Gas injeksi berasal dari separator atau darisumber gas yang lain

Laju Injeksi GasHorse Power CompressorTekanan discharge :

yang tergantung pada laju injeksi gas, HorsePower Compressor, serta sifat fisika gasinjeksi


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Gas Lift - Design 10

Parameter di Wellhead

ProductionChoke

InjectionChoke

Surface InjectionPressure

WellheadPressure

Gas Injection

Production Fluid


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Parameter di Wellhead

Gas Injection Pressure di Wellhead atauSurface Injection Pressure

Tekanan gas injeksi setelah sampai diwellhead dari compressorFungsi dari sifat fisik gas, konfigurasi pipa gasinjeksi, dan temperatur aliran

Wellhead PressureTekanan yang akan mengalirkan fluidaproduksi ke separator


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Perhitungan D P Gas Injeksi

Persamaan Weymouth

Persamaan Panhandle


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Gas Lift Valve

P tP cP c

P t

GasInjeksi

FluidaProduksi

P c = P t


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Gas Lift Valve

GasInjection

TubingPressure

Close condition Open condition


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Parameter pada Gas Lift Valve

Tekanan gas injeksi pada casingTekanan aliran fluida produksi dalamtubingLaju gas injeksiLuas penampang port valve

Temperatur pada kedalaman valve


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Perhitungan Tekanan Gas Injeksipada kedalaman


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Parameter di Dasar Sumur

(D Dv)

P wf @Q L

P t = P wf (dp/dz)(D-D v)

IPR


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CHANGINGReality (System)

Is called innovationRequires actionIs a challenge for a teamThe process is continuous

Takes a long timeDelivers something new to thesystemIts impact is measurable andcertainProject management isrequiredThe fuel is practical ideas anduseful suggestionsThe role of consultant is tocause action

Perception (Individual)

Is called creativityRequires thinkingIs a challenge for an individualThe process is discontinuous

Takes an instantEnvisions a new system

Its impact cannot bemeasured

Brainstorming is requiredThe fuel is questions,surprises, strange andincomplete ideaThe role of a consultant is toencourage reflection


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Gas Lift Design

Penentuan Titik Injeksi


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Diagram Gas Lift Design

Pwf

Pso

TitikInjeksi Dv

Pso = P dis - D P

Pt = P wf D P @ Q L tertentu


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APLIKASI NODAL SYSTEM ANALYSISPADA SUMUR GAS LIFT

P wf = P r Q/J

Tergantung Laju Produksiyang diinginkan

Pwf

P wh

TitikInjeksi

D1D2

D3

Q yang diinginkan makin tinggidibutuhkan penempatan titikinjeksi yang makin dalam


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P-discharge = 800 psi

Dv= ?

P-surface injection

Compressor L = 6525 ft

d = 2 inchT = 90 oF

L = 5000 ft

d = 3.0 inch

P sep = 180 psi

Well Depth = 7863 ft

d t = 2 7/8 inch (OD)T = 105 oF

GLR = 800 scf/stb

GLR = 300 scf/stb

Pr = 1451.00 psiPI = 2.5 stb/d/psiWC = 50%

PEKERJAANRUMAH #1


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Introduction to Gas Lift

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