2-Tool Configuration GUIDE TO CHOICE OF STANDARD PRODUCTION LOGGING TOOLS TO SUIT APPLICATION Key: P = PRIMARY SENSORS S = SECONDARY SENSORS

Spinner Flowmeter

Temperature

Fluid Capacitance

Fluid Density

Gas Holdup

P S

S P

S P

Pressure

Gamma Ray

CCL

X-Y Caliper

Multi-Fingered Caliper

WELL MECHANICAL PROBLEMS Locate cross flow and thief zones Locate packer, tubing and casing leaks Locate source of unexpected water production Locate source of unexpected gas production Locate regions of scale or wax deposition Locate chanelling behind pipe Locate deformation of tubulars Check on perforation depths Inspect tubing and casing / Monitor corrosion WELL PRODUCTION OR INJECTION PROFILING Production profile in oil wells Production profile in gas wells Production profile in multiphase flow Locate hydrocarbon production in loaded up wells Injection well performance Locate oil - water contacts p hole completions p Correct flowrate in open Locate gas - fluid contacts Determine layer pressures MISCELLANEOUS

Identify lithology in cased hole Identify build up of radioactive scale Make depth correlation Locate cement tops Evaluate cement and squeeze performance Determine geothermal gradient Measure subsurface shut in/flowing pressure

P P P P S

S S S P S P

S

P

S S

P P

S S Spinner Flowmeter P P P P P

S

P P P

X-Y Caliper

Multi-Fingered Caliper

P

Fluid Capacitance

Fluid Density

Gas Holdup

P P P S P S

S P P P

P S P S

P S P S

P

P

S

P

P

P

Temperature

Fluid Capacitance

Fluid Density

Gas Holdup

Temperature

Pressure

Gamma Ray

P P P

S

CCL

P S P

P Spinner Flowmeter

P P

Pressure

S S P

P S P

S

S

S

Gamma Ray

CCL

P P P

P

S P

GENERAL:

Production wells require Pressure, Temperature, Density, Fluid Capacitance, Flowmeter (At least two fluid identification tools are recommended). The Gamma Ray tool will identify radio-active scale which is often associated with water production. The Gas Holdup Tool is an additional fluid identification tool which responds to gas but is relatively insensitive to oil / water ratio. Injection wells require Pressure, Temperature and Flowmeter. Pressure data can be used to evaluate injection well skin damage and string losses. Completion problems require Temperature and Flowmeter with Pressure optional for evaluation of leak flowrates at different pressures. Depth correlation is by Gamma Ray or by CCL if a GR/CCL completion log has previously been recorded recorded. Multi Finger Caliper logging is a specialised separate service to monitor corrosion or scale build up and locate holes in tubulars.

X-Y Caliper

Multi-Fingered Caliper

S

P