gas lift
TRANSCRIPT
GAS LIFT SEMINARGAS LIFT EQUIPMENTEQUIPMENT OPERATIONGAS LIFT CONCEPTRESERVOIR DELIVERABILITYMULTIPHASE PRESSURE GRADIENTSDELIVERY AND OPTIMIZATIONVALVE SPACING AND PRESSURIZINGTROUBLESHOOTING
INJECTION PRESSURE OPERATED (IPO) VALVEBELLOWS
ASSEMBLYSTEM WITH BALL
TIPSEAT (ORIFICE OR
PORT)CHECK ASSEMBLYPACKING
INJECTION PRESSURE OPERATED (IPO) VALVE FOR CASING FLOW
NITROGEN INSIDE BELLOWS TO CLOSE VALVE
GAS PRESSURE OUTSIDE BELLOWS TO OPEN VALVE
FLUID PRESSURE UNDER SEAT
PRODUCTION PRESSURE OPERATED (PPO) VALVESPRING AND/OR
NITROGEN INSIDE BELLOWS TO CLOSE VALVE
FLUID PRODUCTION PRESSURE OUTSIDE BELLOWS TO OPEN VALVE
GAS PRESSURE UNDER SEAT
CHECK ASSEMBLYCHECK WITH
METAL AND ELASOMER SEAT
LIGHT SPRINGLOCATED BELOW
THE SEAT (PORT)
LATCHWIRELINE TOOLS
INSTALL AND RETRIEVE LATCH AND VALVE
POCKET LATCH PROFILE OR RIDGE HOLDS RING IN POSITION
SIDE POCKET MANDRELMANDREL HAS A
VALVE POCKETPOCKET IS OFFSET
FROM TUBING CENTERLINE
VALVE INSTALLED AND REMOVED BY BY WIRELINE
MANDRELCOMPONENTS
ORIENTING SLEEVEGUIDEPOCKETLATCH PROFILE IN
VALVE INSTALLATION
VALVE INTHE WELLPRESSURES
EXPECTED IN THE WELL ARE USED TO SET THE VALVE PRESSURE
THE VALVE JUST CLOSING IS A BALANCE POINT
VALVE INTHE TEST RACKVALVE PRESSURES
IN THE WELL ARE CONVERTED TO STANDARD TEMP AND USED TO CALCULATE THE SET PRESSURE
THE VALVE JUST OPENING IS A BALANCE POINT
BELLOWS LOAD RATEPROBE TESTSTEM MOVEMENT
VERSUS PRESSURE APPLIED
METHOD TO CHECK VALVE FUNCTION
GAS PASSAGEDYNAMIC FLOW
TESTGAS RATE PASSAGEUPSTREAM GAS
PRESSURE CONTROLS STEM MOVEMENT (IPO)
FLUID PRESSURE EFFECT INCLUDED
DENSITYREDUCTION
INCREASE GAS-LIQUID RATIO
INCREASE MIXTURE VELOCITY
CHANGE FLOW REGIME
REDUCE WELLHEAD PRESSURE
RESERVOIR DRAWDOWNUNLOADING
BEGINS THE DRAWDOWN PROCESS
EACH DEEPER VALVE INCREASES DRAWDOWN
EACH VALVE HAS A GRADIENT
UNLOADINGVALVES ALL OPEN
WITH KILL FLUID IN WELLBORE AND GAS PRESSURE APPLIED
GAS PASSES THROUGH FIRST AND JUST REACHES SECOND
FIRST CLOSES WITH GAS RESTRICTED AT CHOKE
STEADY STATE PRODUCTIONWELL UNLOADS TO
DEEP POINTFLUID FEEDS FROM
RESERVOIR AS FAST AS IT CAN FLOW UP THE WELLBORE
SEPARATOR, PIPING, AND RESERVOIR ARE IN EQUILIBRIUM
RESERVOIR DELIVERY
DARCY INFLOWVOGEL INFLOW PERFORMANCE
RELATIONSHIP (IPR)FETKOVICH MULTIPLE RATE
EQUATION
DARCY INFLOW
PI WELL TEST Q = PI (Pr - Pwf)DARCY EQUATION
0.00708 kh Q = ---------------------------- * (Pr - Pwf)
uB (ln re/rw -0.75 + s)
EXAMPLE PROBLEM
VOGEL IPR
PI WELL TESTVOGEL EQUATION
Q/Qm = 1 - 0.2 (Pwf/Pr) - 0.8 (Pwf/Pr)2
EXAMPLE PROBLEM
VOGEL CURVE
FETKOVICH MULTIPLE RATE TESTS
MULTIPLE WELL TESTSFETKOVICH EQUATION
Q = C (Pr2 - Pwf
2)n
EXAMPLE PROBLEM
MULTIPOINT DATA
MULTIPHASE GRADIENTS
MATCH MULTIPHASE GRADIENTS TO RESERVOIR INFLOW PERFORMANCE
VALIDATE MULTIPHASE GRADIENTS WITH MEASURED PRESSURE DATA
COMPARE TO GAS GRADIENTSUSE FOR WELL ANALYSIS AND
OPTIMIZATION
MULTIPHASE GRADIENTS
OUTFLOW WHP
OUTFLOW WHP
OUTFLOW BHP
OUTFLOW BHP
OUTFLOW BHP - TBG SIZE
OUTFLOW BHP - TBG SIZE
GAS INJECTION PRESSURE, 0.7 SG
GAS INJECTION PRESSURE, 0.7 SG
GAS GRADIENTS
WELL DELIVERABILITY AND OPTIMIZATION
DELIVERABILITY vs INJECTION GAS LIQUID RATIO
DELIVERABILITY vs DEPTH OF INJECTION
OPTIMUM PERFORMANCE IS OBTAINED WHEN THE HIGHEST PRESSURE IS USED TO REACH THE DEEPEST POINT OF LIFT
OUTFLOW BHP vs IGLR
OUTFLOW BHP vs IGLR
PRODUCTION RATE vs IGLR
PRODUCTION RATE vs IGLR
INJ. PRESSURE REQUIRED
VALVE DESIGN
VALVE SPACING SPACING FACTOR KILL FLUID GRADIENT
PRESSURE SETTING GAS PRESSURE AT CLOSING MINIMUM FLUID PRESSURE PORT SELECTION & GAS PASSAGE UNLOADING TEMPERATURE
SPACING METHOD
USE A DESIGN SPACING LINE SURFACE POINT IS:
Pd = Pwh + SF * (Pinj - Pwh) BOTTOM POINT IS:
Pf at VALVE OPERATING POINTUSE THE GAS GRADIENTUSE KILL FLUID GRADIENT AND SPACE
VALVES BETWEEN THE TWO LINES (GAS AND DESIGN)
DESIGN - SPACING
DESIGN - SPACING
DESIGN - PRESSURE SETTING
DESIGN - PRESSURE SETTING
DESIGN - PRESSURE SETTING
TEMPERATURE CORRECTION
MEASURED GRADIENT DATA