kle 3130

Composite Carbon Rod

At the heart of Ziebel’s proprietary technology is the 15mm diameter composite carbon rod which deploys the fiber optic strands or cables securely into the hostile downhole environment.  The rod carries 2 multi-mode strands and 4 single mode strands enclosed in a stainless steel tube.  The composite is made of longitudinal carbon fibers bound together in a polymer matrix.  It is light and extremely strong (10 tons in tension) while being chemically stable and compatible for service in all normally found well fluids.

The rod is manufactured in a tightly controlled continuous process to achieve consistent properties over the typical finished length of 6,200m (~20,000ft).  The rod is semi-stiff and has no “memory”, which means it can be coiled on a drum (either 4.2m or 3.5m diameter are used), but when uncoiled it will straighten without trying to hold its previous bend like steel coil tubing.

The rod is stiff enough to be pushed out into the horizontal sections of wells until frictional forces cannot be overcome.  The reach limits are determined by the internal diameter of the pipe, the condition and roughness of the internal surface and the amount of debris in the hole. Ziebel routinely simulates the expected horizontal reach of the rod by running the Cerberus software model which predicts when the available push (compressive load) from surface will be unable to overcome the frictional resistance and the rod lock-up in a similar manner to coil tubing.

The carbon rod has been tested for compatibility with 15% HCL acid wash and with scale inhibitor chemical cocktails, which offers the possibility of real-time stimulation monitoring while these treatments are bull-headed from surface, to confirm the effectiveness of any diversion methods employed and that the fluids are being delivered to their target zones correctly. 


Carbon Rod Data Sheet

Z-System® Carbon rod Technical Specifications

Item Specification Note
Composition of carbon rod Carbon fibre reinforced polymer Suitable for a oil/gas well environment
Diameter 15 mm  
Length Up to 6600 meters  
Weight in air 280 Kg/Km  
Tensile load capacity >10,000 Kg  
Compression load capacity 500-1000 Kg Depends on well diameter
RIH/POOH speeds 0-40 meter/minute  
Fibre Optics within the carbon rod 2 x Multi-mode
4 x Single-mode 
Operating temperature rating 150 oC Maximum 135 oC Maximum if horizontal
Operating pressure rating 10,000 psi  
Chemical Resistance H2S, HCL, CO2 and Scale Inhibitor  
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