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Production
Logging Services
- Casing Collar Locator (CCL)
- Gamma Ray
- Quartz Pressure
- Fluid Density Log Nuclear
- Water Hold-up Indicator
- Gas Hold-up Indicator
- Dual X-Y Caliper
- Hydro Log
- Temperature Log
- Continuous Spinner Flowmeter
- Basket Flowmeter
- Thermal Multigate Decay-lithology
- Downhole Tractor System
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Casing Collar
Locator
CNLC manufactures a range of Casing Collar Locators
for a variety of casing diameters. The CCL responds
to changes in metal volume such as at tubing
collars and perforations. Casing Collar Locators
are available as surface readout tools or as
memory telemetry tools. Memory telemetry tools
may be run on Slickline or Non Conducting Coiled
Tubing.
Applications
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- Depth Control in Casing and Tubing
- Location of Severe Casing or Tubing Damage
- Confirmation of perforation depths/intervals
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Gamma
Ray
This scintillation detector tool measures gamma
radiation. It outputs counts scaled to be approximately
one count per API unit. Both Memory and Surface
Readout models are available. A variety of tool
types ranging from 1 3/8" to 1 11/16" diameter
are available to measure gamma radiation from
the formation surrounding the wellbore or for
particular applications. All models are compact,
rugged and combine excellent sensitivity with
high resolution for cased hole production logging
applications. Tools can be combined for tracer
work and, with the addition of a gamma source,
used for gravel pack investigations.
Applications
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- Lithology Identification
- Depth Correlation
- Identification of Radio Active Scale.
- Tracer Monitoring
- Gravel Pack Monitoring (with addition of
a gamma source)
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Quartz
Pressure
For high precision downhole pressure measurement,
CNLC offers a quartz pressure gauge tool, employing
an Industry standard quartz crystal pressure
transducer. The tool provides both pressure
and gauge temperature outputs.
Applications
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- Data for P.I. and Nodal Analysis
- Draw-Down and Build-Up Pressure Transient
Analysis
- Down-Hole Pressure Gradient Measurement
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Fluid
Density Log - Nuclear
The Nuclear Fluid Density (NFD) Log is a radioactive
log of the gamma ray type. While the Gamma Ray
Log is a measurement of natural gamma rays,
the Nuclear Fluid Density Log data are a record
of the density difference between water, oil
and gas, and are generated by use of a chemical
gamma ray source. The density measurement is
made by observing the relative absorption of
gamma rays by the borehole fluid in a sampling
channel. The basic unit of measure is a count
of residual gamma rays. This counting rate is
inversely proportional to the density of the
sample and is a function of the activity of
the gamma ray source. The log density data are
recorded in grams per cubic centimeter.
Applications
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- Locate entry of primary and secondary fluids
in a 2- or 3-phase production flow
- Provide a density profile in a multiphase
production flow
- Determine flow regime
- Locate borehole levels in static and flowing
conditions
- Locate tubing and casing leaks when the leaks
result in multiphase flow
- Check the operation of gas lift valves
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Water
Hold-up Indicator
The enhanced Capacitance Water Hold-up Tool
operates in the same manner as a standard tool,
but has improved circuitry. It therefore provides a
better response to changes of fluid when the
water-cut value is high.
The improved design, in addition to providing
greater discrimination in higher water cuts,
also minimises the "watering out"
effect. This effect results in the tool output continuing
to indicate water even though the surrounding
fluid has been replaced by hydrocarbons.
Applications
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- Multi-Phase Production Profiling
- Oil / Gas / Water Hold-up Calculations
- Qualitative Analysis of Water Loaded Up Wells
- Qualitative Analysis of High GOR, Water Free
Wells.
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Gas
Hold-up Indicator
The Sondex Gas Hold Up Tool was originally developed
by Halliburton to provide a reliable, cross
well bore means of measuring gas volume fraction
in any flow regime and at any deviation. The
tool response is representative of the entire
cross section of the well bore within the casing
and is almost completely independent of salinity,
water cut and oil/water densities.
Applications
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- Multi-phase Production Profiling
- Fluid Identification
- Bubble Point Determination
- Gas Entry Detection
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Dual
(X-Y) Caliper
The Dual (X-Y) caliper is run centralised in
the Production Logging tool string. The caliper
incorporates proven roller centraliser technology
and has a pair of caliper arm mechanisms set
at 90 degrees to each other to measure casing
inside diameter in the X and Y axes. The caliper
assembly is fully collapsible down to tool diameter
for running into and pulling out of hole.
Applications
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- Determination of X-Y diameters at 90 degrees
- Measuring of casing and tubing deformation
and major corrosion
- Detection of scale build up in casing and
tubing
- Correction of spinner derived fluid velocity
for varying casing or open hole completion diameter
- Identifying ID to correlate with changes in
holdup patterns.
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Hydro
log
The Hydrolog service uses oxygen activation
for accurate detection of waterflow through
multiple string configurations. A high-energy
(14 MeV) pulsed neutron source activates oxygen
nuclei, creating nitrogen-16, a rapidly dissipating
radioactive isotope. Background measurements
by two detectors allow for waterflow detection
and velocity determination. The source/detector
arrangement can be reversed, depending on waterflow
direction.
Applications
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- Identify waterflow behind casing without perforations
- Detect flow in either liquid-filled or air-filled
wellbores
- Provide accurate waterflow diagnostics in
a single logging run through multiple string
configurations
- Detect waterflow in either up or down directions
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Temperature
Log
The Temperature Log provides a continuous
measurement of borehole fluid temperature.
From the absolute borehole fluid temperature,
a continuous differential temperature curve
can be calculated at the surface.
Applications |
- Locate points of gas entry in open and
cased holes
- Distinguish zones that are producing
from those that are non-producing
- Determine the geothermal gradient
- Determine injection points and under
some conditions develop an injection profile
- Locate tubing and casing leaks, particularly
when the leaking fluid is gas
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Continuous
Spinner Flowmeter
Continuous Spinner Flowmeter surveys can be
used for metering fluid flowrates within either
cased or openhole wells. The velocity and
direction of fluid movement in the borehole
can be determined by the Continuous Spinner
Flowmeter.
Units of measurement are revolutions per second,
which can be converted to barrels per day
and percentage of full flow. The latter is
usually presented in a flow profile derived
from a log made with a stationary tool or
a tool moving at constant speed.
Applications |
- Injection and production profiles to
indicate relative fluid movement from
or into a zone of activity
- Locate points of increased production
due to well treatment
- Detect the loss of production due to
cross flow or thief zones
- Detect packer and plug leaks
- Detect zones of lost circulation in
open holes
- Determine flow regime
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Basket
Flow Meter
The Basket Flow Meter is used for metering low flow
rates within either cased hole or open hole wells.
The motor driven Basket Flow Meter is lowered into
the well through the tubing in a closed position.
It is then opened to take stationary readings at
the point of interest. Once opened, the flow is
directed through the center of the tool, where rotational
velocity of the spinner is proportional to the velocity
of the fluid movement.
Applications |
- Production profiles to indicate relative fluid
movement from the zones of activity
- Injection profiles to determine intervals
accepting injected fluid
- Detect the loss of production due to cross
flow or thief zones
- Detect packer and plug leaks
- Determine flow rate of multiphase flow in
vertical or deviated well bores
- Measure flow rate of low velocity flow
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Thermal
Decay-Lithology Log
Superior Through-Cashing Water Saturation Estimates
CNLC introduces its new pulsed-neutron logging device,
the Thermal Decay-Lithology (TDT) tool. The TDT
provides data that helps determine through-casing
water saturation estimates. TDT data also helps
determine lithology and porosity to aid in reservoir
evaluation.
Primary applications of
the TDT include: |
- Cased hole formation evaluation
- Reservoir monitoring
- Lithology determination
- Enhanced oil recovery monitoring
- Gas vs tight determination
- Spectral water flow detection
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Downhole
Tractor System
The field proven Downhole Tractor System provides
a state of the art method to deploy tools &
equipment along horizontal and highly deviated wells
using standard mono-conductor wireline. This makes
the system a reliable cost effective alternative
to Coiled Tubing. Although the tractor is small
and easy to transport, it is very powerful and can
be used to deploy equipment to the end of the longest
reach wells.
Applications |
- Production Logging incl. Horizontal Well Sensors
- Perforating & other Explosive Services
- Corrosion Logging
- Video Camera
- Junk Baskets
- Directional Surveys
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