model multi-layered reservoirs with horizontal drilling – multiple producing zones

7/31/2019 Model Multi-Layered Reservoirs with Horizontal Drilling Multiple Producing Zones

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Model Multi-LayeredReservoirs withHorizontal DrillingMultiple ProducingZones

Unleash Your Asset Potential

Alfonso R. Reyes,Sr. Account Manager Production SolutionsApril 10/12, 2012


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Copyright 2011 IHS Inc. All Rights Reserved.

Modeling multi-layered reservoirs

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BackgroundNodal analysis in horizontal wells withmultiple layers

Workflow

1. Define the well system

For each layer or zone:

2. Enter fluid data3. Enter reservoir data

4. Enter completion data

5. Enter wellbore data

Objective

Find solution points for nodes and

reservoirs (layers)


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Project 1

multilayer well3 reservoirs

3


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Horizontal Well Schematic

4

800 1000 1200 1400 1600600400200

40

100 100

1

2

Link 3

Link 2 3

1

2

3


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Middle and Bottom Zones

5


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Well Data

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Wellbore Data

Fluid Data

Oil Gravity 35 API

SG Gas 0.65

GOR 121.5 scf/bbl

Watercut 10%

SG Water 1.05

Gas impurities None

Bubble Point: Calculate from GOR/GLR

Viscosity Calibration No Calibration

InflowType Bottom, ft Top, m OD, in ID, inCasing 4000 7.625 6.875

Casing 8000 5.500 4.950

Tubing 7000 2.875 2.441

Pressure / Rates

Tubing Pressure 30 psig

Casing Pressure 0 psig

Top of Perforations (MD) 7900 ft

Reservoir Temperature 210 FWellhead Temperature 100 F

Directional Survey Yes

Gas Lift No

Wellbore Correlation Hagendorn

Correlation Tuning Factor 1

Bubbly Flow Yes

Depth secondary correlation x

Correlations

Performance Method Vogel Corrected for Watercu

Static BHP 2000 psig

Static Fluid Level x ft

Casing Pressure x psig

Watercut 10%Fluid Rate at test BHP 800 BPD

Test BHP 285 psig

Solve for: Pump Intake Conditions

Total Fluid Rate 600 BPDPump Depth 7000 ft

Pump Intake

Fluid Level Correction None

Intake Pressure x psig

Fluid Over Pump x ft


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Process Workflow

7

Enter completion

data

Enter reservoir data

Enter the basic well data

Enter fluid dataEnter directional survey

and links

1

345 2

R1

R2

R3


8/37Copyright 2011 IHS Inc. All Rights Reserved.

Enter the basic well data

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1



Enter the fluid data

9

2



Enter the reservoir data

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3

R1

R2

R3



Enter the completion data

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4

R1

R2

R3



Enter the directional data and links

12

5

R1

R2

R3



Entering the data

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System setup

Temperature gradient

Reservoir data

Completion data Wellbore data

IPR Correlations

Temperature CorrelationWellbore Correlations

Fluid Data



Run

Startcalculations

scenarios

plots

reports



No Scenarios

Objective

see contribution of each zone

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Inflow plot by reservoir

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System plot for all reservoirs, commingled

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Three Scenarios

Tunnel Length = {100, 125, 150} ft

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Result Plots

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System Plot for all layers commingled

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Sensitivity Plot for three tunnel lengths

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Results What is the maximum rate possible

from all the reservoirs?

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Reports

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System Reports



Questions (1)

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What if have productionper layer and dont have

enough PVT data on

some layers?

Reverse or back calculations

Start with your current productionand create scenarios for missing

well parameters



Questions (2)

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What is the effect ofhigher pressures in one

of the layers?

Multiple pressure scenarios for the layer

Compare plots varying pressureat the high-pressure layer



Questions (3)

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Can I see the effect ofrunning downhole

chokes or restrictions to

any of the layers?

Yes. Multiple pressure scenarios

Create a table of system flowrates at decreasing pressures

until reaching zero psi. See the

effect on the commingled

production.

You can even estimate the size ofthe choke to maximize your

production


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Appendixes

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Project 2

Trilateral Well

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Solution by Nodes: Trilateral well

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2

1 3 4

5

12 34 5


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Project 3

Two Layers

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Solution by Layers: Two Layers Case

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Solution by Reservoirs: Two Layers well

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Case 1

WC=90%

Case 2

WC=30%


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Solution by Layers: System Plot

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Examples description

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TwoLayers Trilateral SmartWell

System analysis for a well

with 2 consecutive layers.

Sensitivity is done on water

cut in second layer. One

zone, oil, produces 10%

watercut and 2nd wet zone

90%. Both zones modeledwith Darcy. Formation

thickness and perforation

intervals 5 different. Wellbore

correlation Duns & Ross. No

restrictions. Flowline

calculations. Sensitivity study

on Wet zone; base caseWC=90% and 2nd case

WC=30%.

Analysis of a multilateral well

with Herringbone trilateral

configuration. Model reservoir

with Vogel and Harrison.

Reservoir pressures are all

different. Zone are left open

hole. Wellbore correlationused is Hagedorn & Brown.

Multilayer well with 3 layers

with sub-surface safety

valves (SSSV). Top reservoir

has lowest pressure than the

other two layers. Modeled

using PI method; Joshi

pseudo steady state IPR isselected for middle and

bottom layers. Two

restrictions are added in the

system- one in the wellhead

and another at a

depth of 7100 ft from the

surface. differentiating criticaland subcritical flow in

restrictions by using Ashford

& Pierce choke correlation


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Files used

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File Description

SMARTWELL.pf7

TRILATERAL.pf7 PERFORM project

TWOLAYERS.pf7


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model multi-layered reservoirs with horizontal drilling – multiple producing zones

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