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Pressure Gauge Survey

 

INTERFACING & TOOL COMBINATIONS

  • Simultaneous Operation with other Specialty Cased Hole Logging Tools

 

Quartz Pressure Gauge / Casing Collar locator (QPC/CCL)

Strain Gauges

 

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Quartz Pressure / Casing Collar Locator (QPC/CCL)

 

The resonant frequency of a shaped quartz crystal varies with the applied pressure. This variation has to be compensated for changes of crystal temperature, hence both pressure & temperature outputs are available from the gauge. Using this data and a calibration supplied with the gauge, an accurate and high resolution pressure reading is available over wide measurement ranges.  An available pseudo-density may be derived from the pressure response data. Changes in the amount of magnetic material around the tool causes variations in the magnetic field that is produced by two strong magnets mounted either side of a coil. These variations induce an electromagnetic field (EMF) within the coil which is processed to produced the collar log.

 

APPLICATIONS

 

  • Depth control in casing and tubing
  • Location of severe casing or tubing damage
  • Confirmation of perforation depths/intervals
  • Data for Productivity Index (PI) and Nodal analysis
  • Draw-down and build-up pressure transient analysis (PTA)
  • Down-Hole pressure gradient measurement

 

SPECIFICATIONS

 

Diameter

1 3/8” (35 mm)

Length

11.98” (304.3 mm)

Weight

3.7 lbs (1.7 kg)

Max. Temperature

177°C (350°F)

Max. Pressure

15,000 psi (103 MPa)

Resolution

<0.008 psi & <0.005°C

Pressure Accuracy

Max. total/ combined error 0.02% FS

Temperature Accuracy

+/- 0.1°C

Pressure Respons

<1 second for 99.5%

Pressure Aging

<3 psi/ year

Depth Offset

0.6” Pressure; 8” CCL

Materials

Corrosion Resistant Throughout

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Strain Gauges

 

Used in conjunction during the well preparation stage prior to deployment of the tool string the strain gauges are incorporated into the “dummy” string in order to evaluate pressure and temperature parameters prior to deployment.  They are usually used in high temp/high pressure environments to evaluate the logging conditions prior to main pass data acquisition.

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