4150
4162
4174
FROM SURFACE CT
HEAD 4186
CT HEAD TO CCL CENTER
CCL CENTER 4198
CENTER TO TOOL REF
CCL
TOOL REF
POINT 4210
-100 -83 -67 -50 -33 -17 0 17 -33 50 67 83 100 CCL
TOOL END
BLUE ITEMS REPRESENT DISTANCE BETWEEN TOOL LANDMARKS
GRAY ITEMS ARE TOOL LANDMARKS
> CTU control cabin display. Computer monitors can pull up a variety of displays. Here, CCL data were used to create a depth-correlation plot. Raw CCL data (red curve) are subsequently filtered (blue curve) to eliminate background noise. When filtered values exceed a specified threshold, they trigger a response (green curve), which is used in correlation. In addition to plotting CCL data in real time, the user can enter casing collar depths from previous log runs (blue dots), which serve as depth-correlation points.
CENTER TO TOOL END
CCL
monocable wireline. The nickel-chromium alloy of the metal carrier has been tested extensively and has withstood temperatures up to 300°F [149°C] and corrosive acid treatments or harsh bottomhole conditions common to nitrogen kickoff or fill-cleanout jobs. This self-contained fiber-optic system imposes no additional footprint on standard CT packages. A two-way communication module, mounted behind a pressure bulkhead on the CT reel, receives data from the PTC sensors via the fiber- optic system. The communication module also transmits commands downhole through the tool’s fiber-optic bundle. At the surface, a com - mun ication bridge moves data securely and wirelessly between the communication module
and a router in the CTU control cabin. A computer in the control cabin displays and monitors downhole job parameters, and can transmit commands back to the communication module and then down to the tool (above and next page). Using the ACTive BHA, telemetry and control system, the operator can monitor annular pressure to confirm efficient cleanouts, measure inflation- and differential-pressure across a packer, or confirm in real time that perforating guns have detonated successfully.
These downhole measurement capabilities have been put to the test around the world, across a wide range of applications.
ACTive Perforating in Malaysia Talisman Malaysia Ltd. (TML) operates more than 130 wells in the South China Sea, where the company has gained extensive experience in perforating using CT conveyance. To carry out a CT perforation campaign, TML called for the ACTive system to ensure that perforations were shot on depth. TML set a maximum under - balance that would not exceed a safe formation drawdown to avoid the risk of collapsing the perforation tunnels.5
anticipated a savings in rig time achieved by avoiding depth-tie-in runs.
5. Rae G, Yusof MB, Ghani J, Mokhtar S and Munro J: “Improved Method for Underbalanced Perforating with Coiled Tubing in the South China Sea,” paper SPE 113698, presented at the SPE/ICoTA Coiled Tubing and Well Intervention Conference and Exhibition, The Woodlands, Texas, April 1–2, 2008.
The company also
30
Oilfield Review
Depth (m)
DEPTH TOOL END DEPTH TOOL REF
CCL CORRELATED DEPTH
(NO OFFSET APPLIED) CT CORR DEPTH
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