Depth correlation and pressure measurement. The QPC is a short combination tool consisting of two sensors: a quartz pressure sensor and a CCL (Casing Collar Locator).
The CCL is a depth correlation tool. The tool responds to changes in tubing metal volume, and can detect collars and indicate perforations or damage. The pressure sensor consists of a quartz crystal and is used for downhole flowing and shut-in pressure measurements. The QPS is also a quartz sensor measuring the wellbore pressure. The tool is used as a second pressure sensor in the toolstring and has the same specifications as the pressure sensor in the QPC-tool.
Pressure data can be used to:
QUARTZ PRESSURE & CCL
|Pressure Accuracy||± 0.2% FS|
|Pressure Resolution||< 0.008psi|
|Pressure Response||< 1 sec for 99.5%|
|Pressure Drift||< 3psi/year|
|Temperature Accuracy||± 0.15°C/± 0.27°F|
|Temperature Resolution||< 0.005 °C/< 0.009 °F|
|Maximum Pressure||1030 bar/15,000psi|
|Maximum Temperature||177 °C/350 °F|