Cement evaluation is essential in the oil and gas sector for verifying the strength of cement bonds in wells. It employs different tools and techniques like CBL, VDL, RBT and another advanced tool. These technologies perform reliably in muds and handle various cement types, including lightweight and foamed varieties. Acoustic logs, such as CBL, measure sonic coupling to ensure hydraulic isolation across layers, avoiding unwanted fluid links. Providers like Asmary delivers on-site insights for informed downhole choices, regardless of borehole fluids, to secure impermeable zones.
Asmary Services for Cement Bond Evaluation
- CBL/VDL
- Radial Bond Log Tool (RBT)
The Radial Bond log Tool (RBT) provides proven superior reliability and responsiveness even in thin cement sheath conditions. With circumferential cement bond evaluation, the RBL identifies channels, in addition to standard cement bond logging. The main application of the Radial Bond Log Tool is to evaluate hydraulic isolation between producing and non-producing zones? a key factor needed to assess the integrity of the well.
The RBT features a powerful sonic transmitter and an array of radially segmented acoustic sensors that derive a calibrated amplitude measurement of the induced sonic signals as they propagate along the length of the casing or liner. These segmented measurements enable the identification of small axial channels. In addition, the tool provides the traditional 3 / amplitude and 5 ft. VDL measurements to provide comprehensive evaluation of cement to casing and cement to formation bonding.
| RBT Tool Specifications | |
|---|---|
| Temperature Range | -25 – 175 DegCC |
| Pressure Rating | 20000 Psi |
| Vibration Rating | 5 g |
| Working Voltage | 100 VDC |
| Current | 180 (10% mA) |
| Receiver Spacing | 1.5ft(457.2mm), 3ft(914.4mm), 5ft(1524mm) |
| Sonic resolution | 6 points/ft (when speed at 550m/h) |
| Sonic accuracy | 5% |
| Suitable casing | 4.5 in 9.5 in |
| Resonance frequency of T/R transducer | 15.5 KHz – 20.5 KHz |
| Max Logging speed | 550 m/h |
| OD of the tool | 2 in |
| Effective length of the tool | 3.8 m |
| Weight | 200 lbs |
APPLICATIONS
- Full circumferential resolution for better channel identification.
- Provides a 360-degree cement map.
- Cement bond quality measurement in slim and conventional wells.
- Indicates channels and intervals using radial receivers.
- Measures the attenuation of the acoustic in the casing to cement interface.
- Cement bond evaluation behind casing.
- Cement top identification.
- Cement to formation bond evaluation.
- Micro-annulus detection.
- Cement bond evaluation prior to Well Abandonment.
- Single transmitter with 3 (near) and 5 (far) receivers.
- 8-segmented radial receiver array for radial cement imaging.
- Slotted sleeve design for improved rigidity, strength, and acoustic isolation.
- Horizontal/deviated hole investigations (for example, combined with the UW inclinometer tool to determine high-side)
RBT Log Sample
