Maximize wellperformance withreal-time reservoirsteering

proVISION

Real-time producibility informationwhile drillingSchlumberger VISION* downholeMWD/LWD imaging services have beenexpanded to include the proVISION*real-time reservoir steering tool. Thisdevice combines the power of magneticresonance (MR) measurements withreal-time data transmission to enhancewell productivity.

Representing a step change in theapplication of MR technology to for-mation characterization, the proVISIONtool provides real-time evaluation ofreservoir productivity. It delivers reliabledetermination of mineralogy-independ-ent porosity, bound- and free-fluidvolumes, permeability, and pore size,as well as identification of fluids. Thisdeep-reading tool has a field-provendual-wait-time capability for directhydrocarbon detection. Operatingindependently of resistivity measure-ments, the tool is ideal for locatinglow-contrast, low-resistivity pay.

The log on the following page is anexample of formation analysis in adeepwater Gulf of Mexico well for BP.ProVISION resistivity-independent oilindicator information, bound fluid vol-ume data and permeability data areintegrated with triple combo-derivedwater saturation information to deliverkey producibility answers while thewell is being drilled. When completedabove the oil-water contact at XXX35 ft,the well should produce water-free.Tracks one through four are availableas real-time data channels. Changes in

the signature of the track five-recordedmode T2 distribution confirm the oil-water contact.

Reservoir steering for production optimization

Magnetic resonance provides criticalreservoir parameters, such as perme-ability and bound-fluid volume, thattraditional LWD tools cannot measure.The proVISION tool enables real-timewellbore trajectory optimization formaximized production. Answers deliv-ered while drilling enable real-timereservoir steering. These answers maybe used to optimize wellbore length bymatching the wellbore’s producibilitycharacteristics to the planned comple-tion capabilities. The tool maximizesproduction by drilling the highly permeable zones and avoiding watercut by using knowledge of irreduciblewater saturation.

Data assurance and early decisions that can save rig time

ProVISION services deliver whenother methods fail, for example inextended-reach horizontal wells inwhich pipe-conveyed wireline logs areunable to reach bottom without piperotation. These services deliver datain multilateral wells, highly deviatedwells or unstable boreholes whilereducing formation evaluation risks.

These data are combined with well-site answer products to allow timelydecision making. Sidetracks can be

Applications■ Geosteering and geostopping

based on real-time permeabil-ity and free- and bound-fluidvolume measurements

■ Formation evaluation withoutradioactive sources

■ Completion, sidetrack orplug-and-abandon decisionmaking while drilling

■ Water-cut prediction andelimination with real-timeproducibility indicators

■ Direct hydrocarbon detection■ Data assurance in difficult

environments

Benefits■ Optimized wellbore trajectory

for maximum productivity■ Enhanced perforation, stimu-

lation and completion design■ Reliable indication of rock

quality and fluid while drilling■ High-resolution measurements■ Reduced coring and well testing■ Real-time data transmission,

including quality control data■ Flexible acquisition allows

T1 and/or T2 mode whiledrilling, sliding or stationary

Features■ High-power turbine for tool

power■ Full operational capability both

with and without a stabilizer ■ A 14-in. diameter of investi-

gation with 6-in. antenna aperture

■ Fully combinable; can beplaced anywhere in the BHA

■ Rotationally symmetric magnet design

■ Minimizes MWD interference,fully corrected

■ BHA motion characterizationpackage

■ Custom programmable■ Deep-reading measurement

for hydrocarbon detectionand rugose boreholes

■ Rugged design to meet highshock, pressure and temp-erature specifications

The proVISION tool.

Real-time connectionstop and bottom

Turbine power for improvedsignal-to-noise ratio andextended bit runs

initiated with the drilling assemblystill in the hole instead of waiting forwireline logs. Plug-and-abandon deci-sions can be made before additionalcosts are incurred. Making such decisions while drilling can lead tosubstantial rig-time savings, particularlyin remote and demanding deepwaterenvironments.

ProVISION measurements madewhile drilling can cut coring, loggingand well-testing costs; optimize com-pletion design; and increase knowledgeof reservoir producibility.

Built-for-purpose designAfter extensive worldwide field testingunder a variety of conditions, theproVISION design incorporates theexperience of Schlumberger LWDoperations. Specifications for temper-ature, pressure, dogleg severity andshock rating are equivalent to thoseof other rugged Schlumberger LWDtools. This tool can be placed any-where in the bottomhole assembly(BHA). Motion characterization dataenable real-time quality control of MRmeasurements with the added benefitof motion and shock analysis for hole condition and BHA preservation. A 6-in. antenna aperture providesexcellent vertical resolution, and thehigh-powered turbine improves signal-to-noise ratio while eliminating tripsto replace batteries.

The proVISION tool can be placedanywhere in the BHA with no detri-mental effects on the drilling operation.

A rotationally symmetric magnet designresults in minimized magnetic interfer-ence that is independent of tool faceand allows for a simple and robustcorrection that reduces interference

to negligible levels. As hole conditionsrequire, the tool can be run with orwithout a stabilizer. ProVISION toolsare fully programmable and usedownhole data processing to minimizedata transmission, resulting in verysmall mud pulse telemetry bandwidthrequirements.

These tools do not use radioactivesources, which allows for easy logisticsand simplifies BHA configuration.

Field-proven results in diverse, demanding environmentsAvailable as a 63⁄4-in. API drill collarfor 83⁄8 to 105⁄8 in. hole sizes, theproVISION tool has proven its dura-bility in the field. ProVISION toolshave provided MR answers whiledrilling in such diverse environmentsas oil- and water-base mud, soft andhard rock, and oil-, gas-, water- andhydrate-bearing formations.

BP deep water Gulf of Mexico proVISION log.

XXX50

XXX50

XXX00

TNPH0.6 0(ft3/ft3)

RhoB1.65 2.65(g/cm3)

Hydrocarbon Flag

proVISION Porosity0.6 0(ft3/ft3)

RT proVISION Permeability

0.2 2000(mD)

Attenuation Resistivity0.2 2000(ohm-m)

Phase Resistivity0.2 2000(ohm-m)

proVISION T2LM1 10000(ms)

0 40(ms)

T2 Distribution

proVISION BFV0.6 0(ft3/ft3)

Bulk Volume Water0.6 0(ft3/ft3)

Total Porosity0.6 0(ft3/ft3)

Water

Hydrocarbon

Sample

RPM0 600(m/h)

Rotation

MD1 : 240

GR0 150(gAPI)

ROP0.25 0(ft/s)Differential Caliper-2 4(in.)

(ft)ROP

WashoutHydrocarbon Flag

1 -10(ft3/ft3)

Field replaceable stabilizerto match hole size andconditions

Antenna 4.8 ft from the bottomof the tool for close to the bitmeasurements

Rotationally symmetricinvestigation volume

Motion characterizationpackage for quality controland drilling dynamics

SMP-8173 ©Schlumberger

February 2003 *Mark of Schlumberger

www.slb.com/oilfield

proVISION Specifications

Measurement

Shell diameter 14 in. [356 mm]Shell height 6 in. [152 mm]Static vertical resolution 6 in. [152 mm]Vertical resolution 3.9 ft at 100 ft/hr [1.2 m at 30 m/hr] with vertical stacking to achieve

± 1 pu or ± 5% porosity accuracyPorosity accuracy ± 1 pu or ± 5%, whichever is greaterMax number of echoes 2000General

Drill collar nominal OD 63⁄4-in. API toleranceDrill collar connection 51⁄2-in. FH box/51⁄2-in. FH boxCrossover subs

Top 41⁄2-in. IF box/51⁄2-in. FH pin or 51⁄2-in. FH box/51⁄2-in. FH pin (real time)Bottom 51⁄2-in. FH pin/41⁄2-in. IF pin or 51⁄2-in. FH pin/51⁄2-in. FH pin (real time)

Makeup length 37.31 ft [11.37 m], including upper crossoverMax temperature 300°F [150°C]Total tool weight 3900 lbm [1769 kgm]

Hole sizeWhen slick 83⁄8–97⁄8 in. [213–251 mm]When near fully stabilized 83⁄8–105⁄8 in. [213–270 mm]

Bending

Max tool curvature Rotating: 8°/100 ft [7.9°/30 m]Sliding: 16°/100 ft [15.7°/30 m]

Bending strength ratio (BSR)51⁄2-in. ID 41⁄2-in. IF collar pin by upper crossover box 2.5651⁄2-in. FH pony sub box by crossover pin 2.0351⁄2-in. FH collar box by crossover pin (lower) 2.0341⁄2-in. IF lower crossover pin by 63⁄4-in. OD collar box 2.75

Equivalent bending stiffness 36.5 ft [11.1 m] of collar (6.5-in. OD × 2.81-in. ID)Average inertia 83 in.4 [3,455 cm4]Axial

Max weight on bit 74,000,000/d2 (ft) = lbm30,576,237/d2 (m) = kgm(d = distance between stabilizers)

Max jarring load 330,000 lbf [1,468,000 N)]Torque

Max rotary 16,000 ft-lbf [21,700 N · m]Max torque (pin yield) 46,000 ft-lbf [62,400 N · m]Connection makeup

51⁄2-in. FH upper crossover × MR collar 25,000 ft-lbf [33,900 N · m]51⁄2-in. FH MR collar × lower crossover 25,000 ft-lbf [33,900 N · m]

Hydraulics

Max operating pressure 20,000 psi [138,000,000 Pa]Max flow rate 800 gal/min [3030 L/min], with 3 vol% max sand contentMin flow rate 300 gal/min [1140 L/min], depends on turbine setupLCM (maximum size) Medium nut plug 50 lbm/bblPressure drop equation Pdrop (psi) = [mud weight (lbm/gal) × flow (gal/min)2]/30,000

Pdrop (Pa) = [mud weight (sg) × flow (L/min)2]/7.47