Post on 06-Dec-2015
description
proVISION PlusMagnetic resonance-while-drilling service
Unlocking the full potential of complex reservoirs
1
proVISION PlusBy providing lithology-independent porosity, pore-size distribution, continuous permeability, and direct hydrocarbon detection, the proVISION Plus* service delivers a step change in real-time producibility assessment for complex reservoirs.
Applications ■ Continuous, real-time, lithology-independent
porosity without chemical sources ■ Continuous, real-time permeability evaluation ■ Resistivity-independent pay identification ■ Thin-bed characterization ■ Carbonate facies characterization ■ Irreducible water saturation ■ Gas-bearing reservoir evaluation ■ Heavy oil and tar identification
Benefits ■ Optimizes well placement to maximize
well productivity ■ Enhances perforation and stimulation design ■ Provides pore size distribution to assess
reservoir storage and flow capacity ■ Saves rig time through early formation
evaluation ■ Prevents plug-and-abandon and sidetrack
decisions by avoiding water-cut situations
Features ■ Real-time, continuous measurement
of T2 distribution ■ Calculation from T2 distribution of continuous
permeability, lithology-independent porosity, producible and irreducible fluid volumes, and pore size distribution
■ Turbine power to eliminate trips to replace batteries
■ Single-sleeve stabilizer that minimizes motion without affecting tendency
■ Ability to be placed anywhere in BHA
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0.5 ms 5,000
0.5 ms 5,000 0.3 g/cm3 0
0.6 ft3/ft3 0
0.6 ft3/ft3 0
Bound Fluid
Free Fluid
T2 Logarithmic Mean
T2 Cutoff
Magnetic ResonancePorosity
> 300 ms
100–300 ms
30–100 ms
10–30 ms
3–10 ms
< 3 ms
Bound Fluid Volume
Density Porosity
T2 Distribution
0.1 mD 10,000
0.1 mD 10,000
Magnetic ResonancePermeability
FormationPressure-While-
Drilling Permeability
The proVISION Plus service measures magnetic resonance and complements other LWD data to provide advanced petrophysical evaluation of complex reservoirs in real time. By fully evaluating rock and fluid properties with the proVISION Plus service, you can reveal bypassed pay zones and determine permeability.
Using T2 distribution, the proVISION Plus service calculates continuous permeability, lithology-independent porosity, producible and irreducible fluid volumes, and pore size distribution. These capabilities make it possible to identify pay zones in shaly sands that would otherwise be bypassed and accurately determine permeability in heterogeneous carbonates. This evaluation method provides the final piece for a complete petrophysical answer.
RESERVOIR QUALITY
Providing a complete petrophysical answer
ONE MEASUREMENT, FOUR ANSWERS
Sign
al d
istri
butio
n
T2, msec
∫T2=φ
Mineralogy-Independent Porosity
Sign
al d
istri
butio
n
T2, msec
Facies Analysis Pore Size Distribution
Sign
al d
istri
butio
n
T2, msec
Irreducible Water and Free-Fluid
Sign
al d
istri
butio
n
T2, msec
k(NMR)=ƒ(φNMR,T2LM)
Continuous Permeability
3
COMPLETION QUALITYBy identifying bypassed pay zones and areas of high permeability, the proVISION Plus service provides information critical to optimizing your completion design. This service provides insight that can improve the effectiveness of your entire completion strategy and creates opportunities to increase production and decrease completion cost.
The service identifies areas of low permeability, helping you make better decisions about where and how to produce. When additional pay zones are discovered, you can use the data to create a targeted completion design.
Using pore size distribution, the proVISION Plus service helps you assess reservoir storage and flow capacity.
Caliper
in10–5 5–10 0 gAPI 150
Gamma Ray
0 cu 40
Formation Sigma
100 m/h 0
Rate of Penetration
0.6 ft3/ft3 0
Neutron Porosity
1.71 g/cm3 2.71
Density
0.6 ft3/ft3 0
Magnetic ResonancePorosity
0.3 g/cm3 0
0.3 ft3/ft3 0
0.3 ft3/ft3 0
Bound Fluid
Free Fluid
Magnetic ResonancePorosity
Bound Fluid Volume
Density Porosity Mac
ro p
oros
ityM
acro
mes
o po
rosi
tyM
eso
poro
sity
Mac
ro m
icro
por
osity
Mes
o m
icro
por
osity
Mic
ro m
acro
por
osity
Mic
ro m
eso
poro
sity
Mic
ro p
oros
ity
0.2 ohm.m 2,000
Attenuation Resistivity at 16-in Spacing
Attenuation Resistivity at 28-in Spacing
Attenuation Resistivity at 40-in spacing
Phase Shift Resistivity, 16-in Spacing
Phase Shift Resistivity, 28-in Spacing
Phase Shift Resistivity, 40-in spacing
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0.3 0
0.50 3.50
Porosity Partitioning
Volu
me
of
mac
ropo
rosi
ty
Mic
ropo
rosi
ty
Volu
me
of
mes
opor
osity
0.01 mD 100
0.01 mD 100
Magnetic ResonancePermeability
Formation Pressure-While-Drilling
Permeability
1.2 g/cm3 3.1
2.19 2.60
Density Image
Density image
0 1
Spectroscopy
Dry-
wei
ght f
ract
ion
of c
lay
Dry-
wei
ght f
ract
ion
of q
uartz
, fel
dspa
r, an
d m
ica
Dry-
wei
ght f
ract
ion
of c
alci
te
Dry-
wei
ght f
ract
ion
of d
olom
ite
Dry-
wei
ght f
ract
ion
of a
nhyd
rite
Dry-
wei
ght f
ract
ion
of p
yrite
SpectroscopySpectroscopySpectroscopy
0.50 6.500.50 6.500.50 6.50
0 ft3/ft3 1
Volumetrics
Illite
Boun
d w
ater
Quar
tzCa
lcite
Dolo
mite
Anhy
drite
Pyrit
eFr
ee w
ater
Oil v
olum
eIrr
educ
ible
wat
er
0.50 10.500.50 10.500.50 10.50
0.3 ms 6,000
0.3 ms 6,000
T2 Logarithmic Mean
T2 Distribution
T2 Cutoff
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While drilling a well with a challenging trajectory to target a complex carbonate reservoir offshore Brazil, an operator required an LWD analysis to identify producible zones.
Schlumberger recommended the proVISION Plus service to evaluate rock and fluid properties and obtain accurate lithology-independent porosity and continuous permeability. In combination with the EcoScope*† multifunction-while-drilling service, logs from the proVISION Plus service would enable the operator to determine if the reservoir required testing, perforation, or acid stimulation.
The high-quality, real-time magnetic resonance data from the proVISION Plus service provided a comprehensive description of the carbonate reservoir rocks, including permeability, to optimize placement of the wellbore. The advanced petrophysical evaluation improved testing and completion design and calculated reservoir producibility for this offshore well.
The proVISION Plus service provided continuous permeability in real time across the entire interval. As a result of data from the proVISION Plus, EcoScope, and StethoScope* formation pressure-while-drilling services, the operator was able to accurately calcuate the producibility of the reservoir.
CASE STUDY
Describing heterogeneous
carbonates
Pay zone
Pay zone
Pay zone
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An operator drilling a deepwater well offshore Africa needed to evaluate potential pay zones in a thinly bedded sandstone reservoir. Because of good vertical connectivity, thinly bedded sandstone reservoirs can contribute to increased well production. However, evaluating potential pay zones within individual sandstone layers is challenging in such complex reservoirs.
Using the proVISION Plus service, a thin-bed analysis was performed to interpret the porosity as it related to well performance. This analysis would help in evaluating the well’s reservoir volumes and capturing the contribution of each pore system.
The thin-bed analysis provided advanced interpretation of the deepwater reservoir’s porosity. The T2 distribution relaxation times enabled the operator to characterize the two laminated sand-shale sequences in real time, resulting in a 60% increase in calculated reserves. Net-to-gross and continuous permeability were also estimated for perforation interval selection and completion design optimization.
CASE STUDY
Predicting production rates
in sandstone
The EcoScope service clearly identified two distinct thin bed pay zones. When the logs from the EcoScope service were combined with logs from the proVISION Plus service, two additional laminated sand-shale sequences were revealed, leading to a 60% increase of reserves in place.
Caliper
10–5 in 5–10 0 gAPI 150 0.6 ft3/ft3 0
0.6 ft3/ft3 0
1.65 g/cm3 2.65
0.68 g/cm3 3.9
0.5 ms 5,000
0.5 ms 5,000 0.3 g/cm3 0 0.1 mD 10,000
0.1 mD 10,0000.6 ft3/ft3 0
0 ft3/ft3 1
0.6 ft3/ft3 0
1.96 2.33
0 10.2 ohm.m 2,000
0 cu 40
100 m/h 0
Rate of Penetration
Formation Sigma
Gamma Ray
Magnetic ResonancePorosity
Neutron Porosity
Density
Density Image Spectroscopy
Bound Fluid
Free Fluid
T2 Logarithmic Mean
T2 Cutoff
Magnetic ResonancePorosity
> 300 ms
100–300 ms
30–100 ms
10–30 ms
3–10 ms
< 3 ms
Cumulative Porosity Gross
Cumulative Porosity Net
Magnetic ResonancePermeability Volumetrics
Formation Pressure-While-
Drilling Permeability
Volu
me
fract
ion
of c
lay
Boun
d w
ater
Volu
me
fract
ion
of q
uartz
, fel
dspa
r, m
ica
Volu
me
fract
ion
of c
arbo
nate
sVo
lum
e fra
ctio
n of
pyr
iteFr
ee w
ater
Oil v
olum
eIrr
educ
ible
wat
er
Bound Fluid Volume
Density Porosity
Dry-
wei
ght f
ract
ion
of c
lay
Dry-
wei
ght f
ract
ion
of q
uartz
, fel
dspa
r, an
d m
ica
Dry-
wei
ght f
ract
ion
of c
arbo
n
Dry-
wei
ght f
ract
ion
of p
yriteAttenuation Resistivity
at 16-in Spacing
Attenuation Resistivity at 28-in Spacing
Attenuation Resistivity at 40-in Spacing
Phase Shift Resistivity, 16-in Spacing
Phase Shift Resistivity at 28-in Spacing
Phase Shift Resistivity, 40-in Spacing
0 unitless 1
Thin-BedAnalysis
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0.2 ohm.m 2,000
0 m 15
0 m 15
Cumulative Porosity Net
Cumulative Porosity Gross0.5 3.5
Thin-BedAnalysis
Density Image Spectroscopy
T2 Distribution
0.50 4.500.50 8.50
Thin-bedpay zone
Thin-bedpay zone
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proVISION Plus
Measurement Specifications proVISION Plus 675 proVISION Plus 825
Hole size 8.375 to 10.625 in [21.273 to 26.988 cm] 10.25 to 12.625 in [26.035 to 32.068 cm]
Range of measurement
Uncorrected porosity 0 to 100% 0 to 100%
Min. echo spacing 600 us 600 us
T2 distribution 0.5 to 5,000 ms 0.5 to 5,000 ms
Vertical resolution
Static† 4 in [10.16 cm] 4 in [10.16 cm]
Dynamic‡ 10 in at 50 ft/h [25.4 cm at 15 m/h] 20 in at 100 ft/h [50.8 cm at 30 m/h]
10 in at 50 ft/h [25.4 cm at 15 m/h] 20 in at 100 ft/h [50.8 cm at 30 m/h]
Precision§ ±1% ±1%
Depth of investigation†† 14 in [38.1 cm] 17 in [43.2 cm]
Min. mud resistivity‡‡ 0.02 ohm.m 0.02 ohm.m
OthersData capacity 420 operating h 420 operating h
Power supply Turbine Turbine
Combinability Fully compatible with all Schlumberger LWD tools Fully compatible with all Schlumberger LWD tools
Mechanical SpecificationsNominal collar OD 6.75-in [17.15 cm] API tolerance 8.25-in [20.955 cm] Nominal API
Min. ID 2.00 in [5.1 cm] 2.5 in [6.35 cm]
Length 37.31 ft [11.37 m] 38.47 ft [11.73 m]
Weight§§ 3,900 lbm [1,769 kg] 5,800 lbm [2,630 kg]
Thread connections 51⁄2 FH Box API 6 5⁄8 FH Box API
Joint yield torque 46,000 ft.lbf [62,367.628 N.m] 91,000 ft.lbf [123,400 N.m]
Max. operating temperature 300 degF [150 degC] 300 degF [150 degC]
Max. operating pressure 20,000 psi [137.9 MPa] 20,000 psi [137.9 MPa]
Max. flow range††† 800 galUS/min [3 m3/min] 1,200 galUS/min [4.5 m3/min]
Pressure drop constant‡‡‡ 30,000 psi 82,000 psi
Stabilizer§§§
Downhole distance 2.5 ft [0.76 m] 3 ft [0.91 m]
OD range 8.25 to 10.375 in [20.96 to 26.35 cm] 10 to 12.125 in [25.40 to 30.79 cm]
Total flow area (TFA)†††† 14% 14%
Max. dogleg severity
Sliding 16˚/100 ft [16˚/30 m] 14˚/100 ft [14˚/30 ft]
Rotating 8˚/100 ft [8 /̊30 m] 7/̊100 ft [7˚/30 ft]
Max. system shock level 30 min at Shock Level 5 (50-gn threshold or accumulated 200,000 shocks above 50 gn)
30 min at Shock Level 3 (50-gn threshold or accumulated 200,000 shocks above 50 gn)
† From radio-frequency antenna aperture. ‡ With three-level averaging and 1% precision for sandstone configuration. § At 25 degC [77 degF] and with three-level averaging. †† Diameter of cylindrical measurement volume. ‡‡ Providing 90-in [228.6-cm] vertical resolution at 50 ft/h [15.24 m/h] logging speed. §§ Including upper crossover. ††† Minimum and maximum depend on turbine setup. ‡‡‡ Pressure drop, psi = [(mud weight, lbm/galUS) × ((flow , galUS/min)2)]/(Pressure drop constant, psi). §§§ Stabilizer sleeves available in several sizes. †††† TFA in in2 is more than 14% of annular flow section (equivalent collar).
proVISION Plus
slb.com/proVISIONPlus* Mark of SchlumbergerOther company, product, and service names are the properties of their respective owners. † Japan Oil, Gas and Metals National Corporation (JOGMEC), formerly Japan National Oil Corporation (JNOC), and Schlumberger collaborated on a research project to develop LWD technology that reduces the need for traditional chemical sources. Designed around the pulsed neutron generator (PNG), EcoScope service uses technology that resulted from this collaboration. The PNG and the comprehensive suite of measurements in a single collar are key components of the EcoScope service that deliver game-changing LWD technology.
Copyright © 2015 Schlumberger. All rights reserved. 15-DR-0057
The real-time solution for advanced petrophysical evaluation of complex reservoirs.
Find out more about proVISION Plus at slb.com/proVISIONPlus