Description

The Cement Bond Imaging Logging Tool (CBMT) is an advanced downhole evaluation tool engineered to provide high-resolution cement bond quality assessment between casing, cement sheath, and formation in oil and gas wells. It leverages proven acoustic wave attenuation measurement principles to deliver actionable insight into cementation quality and zonal isolation-critical for well integrity, production optimization, and regulatory compliance.

Technical Parameters

General Specs
Pressure Rating	14,500psi (100Mpa)	14,500psi (100Mpa)
Temperature Rating	350°F (175℃)	350°F (175℃)
Minimum Casing Diameter	4.5" (114mm)	4.5" (114mm)
Maximum Casing Diameter	10" (254mm)	13-3/8" (339.7mm)
Diameter	2-3/4" (70mm)	3-11/20" (90mm)
Length	2680mm(105.5in)	2750mm(108.3in)
Weight	44.6kg	67kg
Logging Speed	32ft/min(10m/min)	32ft/min(10m/min)
Joint Connection	13-core	13-core
Logging Conditions
Well Fluid	Oil, Fresh Water, Salty Water
Position	Center of Casing
Sensors Parameters
Transmitter	1	1
Receiver	2	2
AD Resolution Ratio	12 bit	12 bit
AD Acquisition Ratio	10Mps	10Mps
Source Distance	8-sector probe	12-sector probe
	CBL Probe	CBL Probe
	VDL Probe	VDL Probe
Electrical Characteristics
Voltage	15 to 30 VDC	15 to 30 VDC
Current	80mA@20VDC	80mA@20VDC
Sampling Period	320ms	320ms
Transducer Parameters Memory Capacity	20KHZ 10Gb	20KHZ 10Gb

How CBMT Works – Science & Measurement Principles

At its core, the CBMT system applies acoustic energy into the borehole environment and measures returned signal behavior. The acoustic wave travels through the casing into the cement and formation. Variations in wave amplitude, attenuation, and travel time correlate directly to the bond strength and cement integrity at the interface:

◆ Good bond conditions attenuate acoustic energy differently than poorly bonded or void regions.

◆ Poor or absent bond results in characteristic signal patterns detectable by the tool's receivers.

◆ Sector Imaging Design

CBMT typically features a motored pad design with multiple circumferential sectors (e.g., six pads dividing the circumference) that independently log each sector's acoustic response. This allows:

360° cement quality mapping around casing

Identification of channels, micro-annuli, and non-uniform bonding

Compensation for borehole environmental effects through coordinated multi-sector measurements.

This sector-based measurement reduces ambiguity compared to single-point logs and enhances the tool's ability to detect localized cementing issues.

Applications Across the Well Lifecycle

CBMT plays a pivotal role in multiple phases of well operations:

◆ Post-cementing evaluation- verifying cement job performance.

◆ Pre-perforation zoning-confirming effective zonal isolation.

◆ Remedial planning-identifying poor bond zones for cement squeeze or repair.

◆ Plug & abandonment verification-documenting barrier integrity before abandonment.

Why Choose Our CBMT Solutions?

◆ Proven Technology-Based on time-tested acoustic imaging and sector-mapping principles that deliver reliable cement evaluation.

◆ Industry-Oriented Design-Supports complex wells with robust construction and multi-parameter integration.

◆ Actionable Outputs-Clear imaging and logs that translate directly into operational decisions.

◆ Professional Support-Technical assistance from field logging experts during deployment and data interpretation.

For oil and gas operators seeking accurate, reliable, and detailed cement bond evaluations, the Cement Bond Imaging Logging Tool (CBMT) provides a scientifically grounded and operationally effective solution. Its high-resolution imaging, sector coverage, and multi-parameter outputs empower engineers to make informed decisions with confidence-enhancing well integrity, minimizing risk, and optimizing project outcomes.

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