RADii® Cement-Bond Tool - Large Diameter


Identifies cement channeling as well as generates the traditional cement bond log and a variable-density log


Applications

  • Cement-bond quality
  • Formation isolation
  • Cement channeling


Features and Benefits

  • Fully Probe® high-speed digital (HD) platform compatible
  • Full SRO and memory capability
  • Master calibration storage in tool memory retrievable when no free pipe is encountered in the well
  • High temperature (HT) version for hostile environments


Tool Description

The Weatherford large diameter RADii segmented cement-bond tool uses a single ceramic transmitter, a sixteen-segment receiver at 3 ft, and a single receiver at 5-ft spacing. The segmented receiver generates a cement map enabling identification of cement channeling while the single receiver generates the traditional cement-bond log (CBL) and a variable-density log (VDL).

The large diameter RADii segmented cement bond tool comes in two configurations: Probe telemetry (PTX) and HD.


Specifications

Ratings and Dimensions

 

PTX

HD

Maximum temperature

350°F (177°C)

Maximum pressure

20,000 psi (138 MPa)

15,000 psi (103.4 MPa)

Outside diameter

3.5 in. (88.9 mm)

Length

9.35 ft (2.82 m)

Weight

175.7 lb (9.40 kg)

Tensile strength

Tension: 40,000 lb
Compression: 40,000 lb

Casing/tubing OD (in./mm)

Min: 4.5 in. (115 mm)
Max: 20 in. (508 mm)

Measure points (ft/m)

Amplitude, TT: 4.3 ft (1.3 m)
VDL, signature: 3.3 ft (1.0 m)

Materials

Corrosion resistant materials used throughout

N/A

 

Borehole Conditions

 

PTX

HD/Memory

HT

Borehole fluids

OBM, WBM

Tool positioning

Centralized with one each centralizer above and below

Logging speed

Recommended: 60 ft/min (18.2 m/min)
Max: 100 ft (30.5 m)/min at 0.08 ft (.02 m) sample rate

 

Electrical

 

PTX

HD

Current

82 mA at 130 V

90 mA at 50 V (SRO)
90 mA at 19.2 V (memory)

 

Calibration

 

PTX

HD

Primary

9.625 in. (24.4 cm) pressurized calibration tank

Wellsite

Free pipe, stored calibration tank waveforms on demand

 

Hardware Characteristics

 

Standard

HD

Source type

One piezoelectric crystal fired at 20 kHz, 50 ms intervals

Sensor type

Omni receiver: One 20-kHz piezoelectric Radial receiver: One 8-segment 20-kHz piezoelectric

Fire rate

20/sec

Waveform

Analog: 3 ft (.9 m), 5 ft (1.5 m)
Digital: telemetry data

Record time

1,400 microns for each receiver
500 microns for each sector

Combinability

GR, CCL, ProMac™, iQ™, temperature

Connections

Top: GOI box Bottom: GOI pin

Acquisition mode

SRO

SRO with TCU
Memory with MLT


Measurements (all configuration except where noted)

 

E1 Peak Amplitude

Sonic Waveform

Principle

Sonic wavetrain attenuation

Range

200 to 1,500 µs

Resolution

3 ft/0.9 m

5 ft/1.5 m

Precision (1 SD)

< 1 mV

N/A

Primary curves

Amplitude: 3ft (.9 m)
Individual sector amplitudes: (3 ft) (.9 m)
TT: 3 ft (.9m)
VDL 5 ft (1.5 m)
Borehole temperature*: 6.48 (1.98 m)

Secondary curves

Probe telemetry and Temperature: Head Voltage, Internal Temperature
HD: Head voltage, internal temperature, accelerometer, volume

*Temperature sub configuration only

RADii Cement-Bond Tool - Large Diameter

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