Job Report Lower drag with GEN 2 Tool Taxi

The Petromac conveyance system was used to successfully guide wireline tools down a deviated wellbore for Todd Exploration, New Zealand. The 12 1/4” hole section was drilled with synthetic oil base mud to a depth of 2862m with 13 3/8” casing at 1074m. The deviation built in open hole from vertical to a maximum of 46deg at section TD. The toolstring comprised of Neutron, Density, Dipole Sonic and Array Induction tools. A total of 7 tool taxis were deployed along the tool-string with a guide attached to the bottom of the Induction tool. The TAXIs carry the tool-string on wheels, clear of the wellbore wall and above any remaining cuttings. The GUIDE allows the bottom of the tool to ski over ledges and obstructions. Analysis of cable head tension shows extremely low tool drag (circa 0.13) during RIH. Approaching TD, head tension was a healthy 800lbs. The measured drag indicates wireline logging with the system is viable in well deviations up to 75deg (with similar wellbore condition). The Guide allowed the tool to pass seamlessly over the washout under the casing shoe (3m x 18” diameter). There were no over-pulls during logging. The open caliper resulted in only a minor increase in tool drag. All Tool Taxi wheels were checked and spinning freely after each logging run.

Conveyance Systems for Wireline Logging

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de

pth

TV

D m

offset m

Well Trajectory

Casing

46deg

Washout under shoe. no hold-up

Downlog Head Tension

Surface Tension low POOH

Drag with caliper open

800lbs head tension at section TD

Deviation

Theoretical Head tension . Weight along-hole.

Tool Drag coefficient RIH

Downlog Head Tension

Uplog Head Tension

Tool Drag coefficient RIH

Average drag coefficient = 0.13 Significant reduction from drag with conventional tool-strings (0.4)

Logging viable at 75deg Extrapolation of head

tension to 200lbs (safe head tension to avoid cable birdcage)

HEA

D t

ensi

on

deviation

log data

TT35815 1 ½” standoff

TT35815 1 ½” standoff

TT35815 1 ½” standoff

GUIDE HF6-AIT 6deg

TT35805 ½” standoff

TT33805 ½” standoff

TT33805 ½” standoff

TT35815 1 ½” standoff

Tool string configuration EDTC-HGNS-TLD-DSI-AITM