MEMORY ULTRAWIRE RADIAL BOND TOOL - MRBT

RBT is a state of the art probe designed to evaluate the condition of the cement job between the casing and the cement and between the cement and the formation. This information condensed in a log confirms the effectiveness of the hydraulic isolation between productive and non-productive zones.

OPERATION PRINCIPLE:

This probe is run in the well using a slick line, where the cement condition is evaluated through high frequency acoustic signals which are captured by two receivers that have 3 to 5 feet spacing from the transmitter. The first of these transmitters determines the seal between the casing and the cement while the second determines the seal between the cement and the formation

The RBT probe captures additional signals for interpretation which create a “cement map” using maximum, minimum and average widths per segment which help identify channels in the area involved.  

USES:

-    Cement evaluation to identify issues such as the following:
-    Pressure in the Casing – Analysis of connectivity between the annular and the formation which may cause high pressure behind the casing
-    Contaminated underground waters – determination of cross flows behind the casing which may be connecting different formations
-    Isolated Zones – Quantification of the minimum column between zones in order ti define the isolation between them.
-    Water moving behind the casing – Determination of the integrity of the seal. Build this analysis into the interpretation of production logs (PLT).

OPERATION:

-    A  piezoelectric crystal transmitter is used to convert an electric pulse energy into sonic energy.
-    This high frequency pulse is transmitted toward the casing at regular intervals
-    Sound travels through the fluid, contacts the casing and reaches the receivers.
-    The radial receiver, located 3 feet from the transmitter detects the initial part of the signal which determines the casing-cement seal (radial bond)
-    The receiver located 5 feet away detects the signal in its final stage,  coming from the cement-formation which is used to create a VDL  (Variable Density Log).
-    6 radial array probes for obtaining omni-directional measurements and a cement map

BASIC SPECIFICATIONS:

Sensors:
-    Transmitter
-    Radial receiver at 3 feet
-    Omni-directional receiver at 5 pies
-    Rotational
Measurement range: 2” a 7.5”
Log velocity: 30 feet/min (4 data/foot)
Diameter: 1 11/16”
Maximum Temperature: 350°F
Memory (capacity): 128 MB ultra wire