PS Platform

Production loggingwith confidence

The dynamic reservoir environment oftoday’s wells challenges the traditionalmethods of well diagnosis and monitoring.The PS Platform* tool string fromSchlumberger offers higher efficiency,greater reliability and better accuracy in pro- duction logging to increase your confidencein determining your downhole flow regime.

What is the PS Platform concept?This innovative platform enhances the tradi-tional measurements by integrating newtechnology sensors and combining otheressential tools. To reduce overall operationlogistics, the PS Platform tool string acquiresthe same measurements in either memory orreal-time mode.

Higher efficiencyThe tool design provides the most sensors perlinear foot available in the industry—makingit the shortest tool with the most completeanswers. Real-time operations are simplifiedby conveyance on any type of wireline ormultiline (conductive slickline). Memory ser-vices have been completed on slickline, oncoiled tubing and below tubing-conveyedperforating guns.

Greater reliabilityLogging-while-drilling (LWD) technologycontributes to the new standards of downholereliability. Sensors are so stable that wellsitecalibration is not required.

Better accuracyBy integrating a spinner, X-Y caliper and localprobes, the average velocity, hole size andgeometry, and water holdup are independentlymeasured as the required inputs for calculat-ing individual flow rates. All these sensorsare located 16 in. from the tool bottom, whichallows logging in wells with reduced sumps.

The Flow-Caliper Imaging tool includes adirectional fullbore spinner, an independent,self-centralizing X-Y caliper with a signifi-cant range, and local electrical probes. TheFloView* probe technology directly determineswater holdup, and a bubble count measure-ment yields a simple, robust estimate of hydro-carbon flow rate and accurate identificationof fluid entry points.

In wells with high producing rates, jettinginfluence is minimized and friction effect is compensated for by the design of theGradiomanometer* tool.

A choice of high-resolution CQG* CrystalQuartz Gauge, Sapphire* strain pressuregauge or an additional quartz gauge offersflexibility for high-profile surveys or advancedwell testing.

Memory applicationWhen in recorder mode, the data are memo-rized downhole and retrieved at surface witha portable acquisition system. Each sensorcan be programmed up to 10 data points persecond, and more than 100 hr of continuousdata can be recorded.

Applications

■ Conclusive identification of water, oil and gas entrypoints

■ Accurate two- and three-phase flow profile determi-nation

■ Production logging answersin horizontal, deviated andvertical wells

■ Logging in wells with limitedsurface area or rig-up height

Features

■ Integrated directional full-bore spinner with indepen-dent X-Y caliper and localholdup probes 16 in. [40 cm]from tool bottom

■ Physical combinability withvarious perforating and logging services

■ Common sensors for memory and real-timeapplications

■ Resistance to corrosion(exceeding NACE specifi-cations)

■ Logging-while-drillingenvironmental specification

■ Condensed packaging■ High-quality pressure data

(CQG Crystal Quartz Gauge)

Benefits

■ Comprehensive downholeflow profile

■ Reduced overall operationlogistics

■ Decreased operating anddowntime through reliabilityand combinability

■ Direct, calibrationlessholdup measurements

■ SPRINT real-time data validation and quicklookanswer product

The Flow-Caliper Imaging tool integrates innovative sensorsthat provide the most important flow measurements only 16 in. [40 cm] from the bottom of the tool string.

SWBS

SWRS

PBMS

PFCS

Weight

Rollers

Telemetry and power supplyorbatteries and recorder

GR, CCL, temperature,pressure (Sapphire or CQG gauge)

FlowmeterX–Y caliperwater holdupbubble countrelative bearingcentralizer

13.5 ft[4.11 m]

FloView tool

6.8 ft[2.07 m]

UNIGAGE carrier

4.2 ft[1.27 m]

Gradiomanometer tool

4.8 ft[1.45 m]

RST tool

23 ft[7 m]

GHOST tool

7.1 ft[2.18 m]

SCMT tool

10.92 ft[3.33 m]

The PS Platform tool string combines numerous sensors in aminimum configuration of just 13.5 ft [4.11 m], giving you moreanswers per linear foot than any other string in the industry.

RST Specifications

Maximum pressure 15,000 psi [1035 bar]Maximum temperature 300°F [150°C]Maximum tool OD (RST–A) 1.68 in. [43 mm]Maximum tool OD (RST–B) 2.5 in. [63 mm]

Sensor Length Measurement

RST–A tool 23 ft [7.01 m] SigmaPorosityC/O ratioSpectrometryWater flow logThree-phase holdup log

RST–B tool 22 ft [6.7 m] SigmaC/O ratioSpectrometry

CMT Specifications

Maximum pressure 10,000 psi [670 bar]Maximum temperature 300°F [150°C]Maximum tool OD 111⁄16 in. [43 mm]

Sensor Length Measurement Resolution

SCMT tool 10.9 ft [33.3 m] Amplitude 2 in. (at 1800 ft/hr)Cement map

PS Platform Specifications

Maximum pressure 15,000 psi [1035 bar]Maximum temperature 300°F [150°C]Maximum tool OD (no rollers) 111⁄16 in. [43 mm]Maximum tool OD (rollers) 21⁄8 in. [54 mm]Shocks Class 6 specificationsH2S Exceeds NACE specifications

Sensor Length Measurement Accuracy Resolution

Basic Measurement sonde 8.3 ft [2.52 m] Pressure (strain gauge) ± 6 psi [0.4 bar] 0.1 psi [0.007 bar]Pressure (quartz design) ± 1 psi [0.07 bar] ± 0.01% full scale 0.01 psi [0.0007 bar]Temperature 1.8°F [± 1°C] 0.01°F [0.006°C]

Gradiomanometer tool 4.8 ft [1.45 m] Fluid density ±0.04 g/cm3 0.002 g/cm3

Flow-Caliper Imaging tool 5.2 ft [1.59 m] Flowmeter 2 ft/min [0.6 m/min]Water holdup 5% (2% Hw > 90%)

10% in oil continuous phaseBubble count 10% (bubble size > 0.04 in. [1 mm])Relative bearing ± 6°X-Y caliper (2–11 in.) 0.2 in. [5 mm]

UNIGAGE carrier 4.2 ft [1.27 m] Pressure (quartz gauge) ± 1 psi [0.07 bar] ± 0.01% full scale 0.01 psi [0.0007 bar]FloView tool 6.8 ft [2.07 m] Water holdup Same as Flow-Caliper Imaging tool

Bubble countRelative bearing1-axis caliper (2–9 in.) 0.25 in. [5 mm] 0.1 in.

GHOST tool 7.1 ft [2.18 m] Gas holdup 5% without probe protector7% with probe protectorBetter than 0.1% for 2%> Hg > 98%

Bubble count 1% (bubble size > 0.002 in. [0.1 mm])Relative bearing ± 6°1-axis caliper (2–9 in.) 0.25 in. [5 mm] 0.1 in.

Combined servicesWellbore and reservoir characteristics aredefined through simultaneous real-timelogging combinations. The GHOST* GasHoldup Sensor Tool quantifies gas holdupand differentiates gas and liquid entries.The RST* Reservoir Saturation Tool offerssigma, carbon-oxygen, water flow, three-phase holdup and spectrometry logging.The SCMT* Slim Cement Mapping Toolevaluates the cement-to-casing bond andlocates channels. The FloView deviceadds additional electrical probe sensors toincrease wellbore coverage in deviated orhorizontal wells.

With better understanding of the down-hole production regime and near-wellboreenvironment, you can design cost-effectiveremedial operations with confidence.

The PS Platform string combines theBasic Measurement sonde and the Flow-Caliper Imaging tool in just 13.5 ft [4.11 m].This minimum configuration, along with theoptional Gradiomanometer and UNIGAGE*carrier tools, logs in both memory and real-time modes. The additional GHOST, FloView,RST and SCMT tools provide answers inreal time.

Where is the production coming from, and what is being produced?The PS Platform service was run in a wellhaving 5-in. casing, a deviation of 31° andunwanted water and gas production. Theobjective was to obtain a flow profile anddetermine water and gas entry points.The well was logged using a string com-posed of one weight bar, the PS PlatformBasic Measurement sonde equipped withtelemetry module and a Sapphire straingauge, the Flow-Caliper Imaging tool and,because three-phase flow was expected,a Gradiomanometer sensor. The total oper-ating time was 3 hr.

The thermometer reacted strongly to thetop two fluid entries, and the bubble countmeasurements gave even sharper indica-tions of hydrocarbon entry points than didthe spinner. The X-Y caliper data clearlyindicated scaling and casing corrosion, aswell as probable damage from perforationsat X640 ft and X320 ft.

The three-phase flow profile readilyanswered the original questions.■ The first production comes from an entry

a few feet above total depth (X645 ft) thatis producing 800 BWPD and 150 BOPD.

■ The second entry (X440 ft) also produceswater and oil: 2200 BWPD and 500 BOPD.

■ The third entry (X320 ft) produces nowater but produces a large amount ofgas and 2000 BOPD.

Based on this interpretation, other wellsin the area were reevaluated to determineif this lower (X645) interval was present andcould be completed to add to production.After removing fill in the wellbore of onewell, this interval was perforated and initialproduction increased by 500 STB of oil perday. Three additional wells in this field arenow being prepared for completion in thisinterval. Without the PS Platform data, thisinterval would not have been tested andwould have been written off as a nonpro-ductive zone.

(GAPI) 2000

(ft/hr) 50000

63.5

Water Holdup10

10

0.75

1.00 (rps) 600

5000

(psi) 14501200

150

(B/D) 250000

(in.)

(in.) 63.5

WaterHoldup

(g/cm3)

Mixture Density10

BubbleCount

0.00

0.50

0.25

0.75

1.00

0.00

0.50

0.25(b/s)

(°C) 112102

(mm)

(mm) 150

Water

Gas

Oil

Gradiomanometer

Caliper Y

Caliper X

Cable Speed

Temperature

Bubble Count

Spinner

Bubble Size(Nominal)

Bubble Size(Apparent)

Pressure Flow Rates

(g/cm3)

GR

Feet

(B/D) 250000Bubble Rate

X600

X500

X400

X300

Real-time downhole diagnosis with certainty

SMP-5693 ©Schlumberger

September 1999 *Mark of Schlumberger

www.connect.slb.com