Downhole Ancillaries

Rigid Intertool Cable (RITC) Standard

The RITC is a modular rigid connecting system for use with analogue or digital Geochain^TM tools. It allows the tools to be deployed in highly deviated or horizontal wells with precise alignment of all the locking arms. The connection can be totally rigid by using just RITC-05 sections or knuckle joints can be used to provide flexibility. A single knuckle joint can be used or a pair fitted above and below the rigid section. The RITC-05 has an in line connection allowing stacking to increase the tool separation.

GeochainSlim^TM Rigid Inter Tool Cable option (SRITC)

The SRITC is a modular rigid connecting system for use with analogue or digital GeochainSlim^TM tools. It allows the tools to be deployed in highly deviated or horizontal wells with precise alignment of all the locking arms.

The GSR receivers accommodate a modular construction 25’ rigid inter tool connector rated to 20,000psi, 200oC. This low maintenance item provides precise tool alignment and can be coupled together to give a 50’ spacing.

22” Arm Extender Kit

For tool operation in larger diameter boreholes. The arm uses the ASR standard nodes and is fitted in minutes, giving a 22” tool camping diameter.

Downhole Hydrophone (DHH1) Standard

The DHH-1 downhole hydrophone is designed to fit directly above an analogue ASR-1 downhole satellite.  In addition a gamma tool can also be used to provide depth correlation.  The upper coupling is a PEH type which makes it ideal for tractor or pipe conveyed logging operations.

Main Features –

• PEH upper Coupling
• ASR Lower Coupling
• Standard 7 Conductor wireline
• Built in Amplifier
• Direct connection to ASR-1 downhole geophone
• Gamma Compatible
• Optimised for both VSP and hydraulic fracture monitoring work

Downhole Hydrophone (DHH2) Slim

The DHH-2 downhole hydrophone is slim variant of DHH-1 designed to fit directly above an analogue GSR-1 downhole geophone.  In addition a gamma tool can also be used to provide depth correlation. The coupling is an inline GO-7 style which makes it ideal for tractor or pipe conveyed logging operations.

Main Features –

• GO-7 in line coupler
• ASR Lower Coupling
• Standard 7 Conductor wireline
• Built in Amplifier
• Direct connection to GSR-1 downhole geophone
• Gamma Compatible -Optimised for both VSP and hydraulic fracture monitoring work

Tractor Switch Sub (GCN-10)

The GCN-10 is an in-line tractor switching sub for use with the Geochain^TM system. It is designed to sit directly below the wireline x-over unit and above the TAS in the Geochain^TM string.

The switching sub allows the six outer conductors to be combined downhole to minimise voltage drop when deploying a tractor at the bottom of a Geochain^TM string.  Dedicated high current wiring then routes the tractor power along the central line 7 conductor through the entire string.  The sub can be wired to failsafe into either tractor mode or Geochain^TM mode

Main Features – 

• In-line Configuration
• Standard 7 Conductor wireline
• 400˚F / 205˚C -25,000 psi pressure rating
• 3’’ diameter
• 15’’ length
• Control voltage 28V DC
• Voltage 400V max
• Current 7 amps max

Motion Sensor

The downhole Motion Sensor is a highly sensitive in line motion sensor for use with the Geochain^TM system. It is designed to sit directly below the VRS Voltage Regulator Sinker and provides immediate indication of tool movement or hang up during system deployment. The motion sensor unit is sits within the VRS nose cone assembly located at the very bottom of the Geochain^TM tool string.

Main Features – 

• OYO SMC1850 omni phone
• Standard 7 conductor wireline
• Direct connection to VRS
• Gamma option
• 400˚F / 205˚C
• 25,000 psi pressure rating
• 3’’ Diameter

Voltage Regulator Section (VRS) 

The VRS (Voltage Regulator Section) is located at the bottom end of the Geochain^TM digital receiver array.  The VRS operates both as a voltage regulator to establish the 110 volt ASR arm operating motor power voltage and as a sinker weight.  It is equipped with a motion sensor to assist with the lowering of AST tools down the borehole.

A portion of the current through the VRS is diverted to operate the ASR arm control motors. The Geochain^TM software is able to resolve any current demands required by the ASR arm motors by automatically suspending one or more motors until more current is available.

Sinker Bar (SINK-1) 

The SINK-1 Roller Sinker Bar is located at the bottom end of the Geochain^TM digital/ASR-1 Analogue receiver array and serves as a sinker weight. When used with the digital Geochain^TM system the sinker is able to couple directly below the VRS motion sensor ensuring full string monitoring functionality when lowering receivers into the well. Multiple sinker bars can be joined together to give a greater sink weight. Containing no additional internal electronics the SINK-1 is a very low maintenance device and can perform within the harshest of well environments.

Main Features – 

• Robust Sinker Bar
• Compatible with Geochain^TM Analogue and Digital
• Multiple Sinker Bars can be joined together
• Very Low Maintenance

Cross over tools

Avalon provide a range of cross over tools which allow the Geochain systems range to be utilised with third party equipment.  This includes logging tools, downhole receiver tools and sparker tools.

Main Features 

• Quick and easy fitting
• Compatible with all ASR equipment
• Temperature rating of 401°F(205°C)
• Pressure rating of 25,000psi