
DOWNHOLE TOOLS
We offer a wide variety of tools to suit all of your well logging needs. All of our tools come in a variety of sizes and combinations. Contact us today to find out more.

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Caliper can be utilized as a spring type centralizer above or below existing radiation tools
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H2S and corrosion resistant material used throughout, including the spring material
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Motors, lead screw, shaft seals and switching circuits are eliminated using the magnetically coupled caliper
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No power is required to open or close this tool
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Advantages, besides centralizing, is logging up or down without closing springs, IN/OUT flexibility in springs gives minimal error and excellent repeatability
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Available in 3 version:
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Pulse type output
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Analog type output
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One wire feed-thru relay option for running in conjunction with other tool types
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Magnetically coupled caliper
This caliper measures EMF proportional to casing millivolts. With each survey point, the caliper is placed into a zone and arms set open, than a surface millivolt meter is used to make measurement of the potential. After readings, arms are retracted and the next zone is tested for current flow. To insure electrical connection to the inside casing, sharp carbide contacts are used. A minimum of 4 conductors are required for this survey.
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Motorized open and close
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12' electrical measure points
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18' overall length
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7' maximum length with break-down
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Temp rating: 300° F
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Pressure rating: 15k PSI
casing contact caliper
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Standard caliper available with single arm, three arm, and XY assembly.
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Heavy duty motorized arm section with a hi-torque DC motor with ball screw drive
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Carbide wear pads with hard surface subs
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Optional electrode arm tips for dry-hole resistivity and RSP bands available in all models
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Electrical feed thru for stacked subs; specify single, four, or seven conductor top subs
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Optional V.C.O. pulse type caliper for single conductor service available
*For sizes, pressure and temp ratings refer to chart on "Info and Data" page
*Custom tool stacks available upon request
motorized caliper
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All probes run on +120 volts @ 60mA
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High pressure and/or H2S resistant housings available
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Large volume, high-sensitivity scintillation detectors available on 1 5/8" OD tools and up
*For sizes, pressure and temp ratings refer to chart on "Info and Data" page
logging gamma ray probes
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Although virtually all of Comprobe's logging gammas may be used for production work, these three probes are most often utilized:
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1204 series (often paired with injector)
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1304 series (often paired with injector)
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1804 series (shortened version with slip-ring adaptation for production logging)
production gamma ray probes
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Comprobe utilizes ruggedized scintillation-type detectors or GM tubes for gamma ray correlation in shooting gamma ray probes. Detectors are 3-axis shock protected for longer operating life. Tool contains negative shoot-thru protection. These probes are typically combined with top or bottom mount CCL's that are modular coil and magnet assemblies with dual-diode protection. Appropriate subs are necessary looking down into the perforating guns for 1 5/8" OD and larger.
*For sizes, pressure and temp ratings refer to chart on "Info and Data" page
perforating gamma ray probes
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Dual channel to indicate flow direction and velocity
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Minimum sensitivity: 4 FPM
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Utilizes photo transfer encoder and light source to detect impeller speed
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Temp rating: 225° F
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Pressure rating: 20k PSI
Flowmeter
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3/4" Single Cond. for 7/8" probe
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1" Single Cond.
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1" Four Cond.
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1 1/4" HD Four Cond.
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1 7/16" Single Cond.
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1 1/2" Seven Cond.
Cable Heads
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Combines di-electric and temp measurement in one
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Super polymer cell di-electric gives accurate determination of oil, water, and gas
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Platinum thin-film ceramic substrate gives excellent stability, response, and accurate temp reading
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+/- 1% accuracy
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Temp rating: 300° F
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Pressure rating: 20k PSI
Capacitance-Temperature Probe
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1 11/16"-16" Magnetically coupled caliper centralizer
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1 13/16"-16" Low profile centralizer; 3 leaf
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2 1/4"-14" Standard centralizer; 3 leaf
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2 1/4"-14" Housing type for neutron or temp probe; 3 leaf
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2 1/2"-14" HD centralizer; 4 leaf
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2 1/2"-14" Housing type HD centralizer; 4 leaf
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3 5/8"-24" Magnetically coupled caliper centralizer
Centralizing Bow Springs
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Single cond. top sub
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Scintillation type gamma ray sections are identical except for pulse polarity and divide by ratio
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Top section for natural gamma and lower for omni directional density
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Excellent for gravel pack
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Uses a 150 mCi Cs-137(or equivalent) source
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Temp rating: 300° F
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Pressure rating: 20k PSI
4pi Omni Directional Density Probe
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Long spaced, focused detector: Nal crystal with photo-tube
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Short spaced, focused detector: Halogen quench Geiger tube
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Utilizes Cs-137 (or equivalent) in collimating shield
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Very effective in dry or fluid filled holes
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Includes de-centralizing bowstring with carbide wear pad
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Temp rating: 225° F
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Pressure rating: 20k PSI
Dual Spaced Collimated Density Probe
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1 1/4" probe
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Detector: Nal Crystal with photo-tube
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Uses 50 mCi Am 241 source (or equivalent)
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Temp rating: 225° F
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Pressure rating: 5k PSI
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2 1/8" or bigger
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Same construction as dual spaced except no short spaced detector
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Temp rating: 225° F
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Pressure rating: 20k PSI
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Single Spaced collimated density probe
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LE version uses scintillation detector with a 50 mCi AM 241 (or equivalent) source
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Temp rating: 225° F STD, 300° F optional
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Pressure rating: 20k PSI
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HE version uses Geiger Muller detector with 10 mCi Cs 137 source
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Temp rating: 350° F
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Pressure rating: 20k PSI
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Fluid density probe
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1 7/16" shooting dual diode, monel, 350° F, 20k PSI
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1 5/8" motor tool tri diode, monel, 350° F, 20k PSI
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1 5/8" shooting dual diode, monel, 350° F, 20k PSI
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1 3/4" shooting dual diode, monel, 350° F, 20k PSI
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2 1/8" shooting dual diode, Beryl-copper, 350° F, 20k PSI
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3 1/4" shooting dual diode(comes with quick change firing adapter), beryl-copper, 400° F, 20k PSI
casing collar locators
(Single Cond shooting type)
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1" Beryl-copper, 350° F, 15k PSI
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1 1/4" Stainless steel, 350° F, 5k PSI
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1 3/8" Monel, 350° F, 20k PSI
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1 7/16" Monel, 350° F, 20k PSI
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1 5/8" Monel, 350° F, 20k PSI
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1 5/8" High temp, monel, 500° F, 20k PSI
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1 5/8" W/ slip rings, monel, 350° F, 20k PSI
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2 1/8" Beryl-copper, 350° F, 20k PSI
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2 3/4" Beryl-copper, 350° F, 20k PSI
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3 1/4" Stainless steel, 350° F, 10k PSI
Casing collar locators
(Logging type with amplifier)
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16" center to center, typical source to detector spacing
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6" HE3 detector
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Open or case hole porosity survey
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7/8"-2 1/8" OD probes may use a 1.2 Ci AmBe source for open hole only
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1"-3 1/4" OD probes may use a 3 Ci AmBe source for cased or open hole
*For sizes, pressure and temp ratings, refer to chart on "Info and Data" page
Single Space neutron probe
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Cased and open hole operation
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4" HE3 short spaced detector
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6" HE3 long spaced detector
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Uses 5 Ci AmBe (or equivalent) source
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8 1/4" spacing from source to short spaced detector
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11 1/2" spacing from short spaced detector to long spaced detector
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Temp rating: 300° F
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Pressure rating: 20k PSI
Dual spaced neutron probe
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Uses a piezo-electric crystal to detect downhole audio frequency and amplitude variations due to fluid and gas movement
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10mv to 7V peak to peak output, can be hooked to external speaker
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Runs stacked with a 0°-300° F linear temp probe, that generates 10 PPS per degree
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Temp rating: 300° F
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Pressure rating: 20k PSI
noise temperature probe
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Provides precise rotational positioning of lower stacked orienting tool and perforating gun
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Excellent for use in multiple completion perforating
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Shooting adapter to connect retrieveable jet perforating strings
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10 position indicator
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Temp rating: 350° F
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Pressure rating: 20k PSI
motorized orienting tool
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Solid state pressure transducer uses piezoresistive sensor
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2 standard pressure ranges available: 0-500 PSI and 0-10,000 PSI
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Maximum typical full scale error of .5%, typical .1%
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Maximum repeatability error of .05%
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Temp rating: 250° F
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Pressure rating: Max pressure of pressure transducer
*Custom pressure ranges available upon request
Pressure Probe
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Solid state pressure transducer uses piezoresistive sensor
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2 standard pressure ranges available: 0-5000 PSI and 0-10,000 PSI
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Maximum typical full scale error of .5%, typical .1%
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Maximum repeatability error of .05%
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Temp rating STD: 250° F
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Temp rating hi-temp: 400° F
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Pressure rating: Max pressure or pressure transducer
*Custom pressure ranges available upon request
Pressure temperature probe
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Rugged fiberglass mandrel with no downhole electronics
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Heavy duty lead bands
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Capacity of simultaneous 8"-16"-32"-64" E-log. Spontaneous potential and point resistance
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Four or seven conductor service
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Temp rating: 350° F
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Pressure rating: 20k PSI
electric log sonde
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Focused articulated density sonde
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Micro log resistivity-pad type
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Pulse type gamma ray scintillation type
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Hi torque D.C. motor with ball screw
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4"-16" caliper range with hydraulic pad shock absorber
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Time share electronics increases counting accuracy
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Simultaneous resistivity micro log 2" normal with a 1x1 inverse lateral
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Density prove may be replaced by focused neutron
Microresistivity probe
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Provides electrodeless conductivity measurement from 50 x 10^-6 Siemens to 1000 x 10^-3 Siemens
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Extremely rugged construction of sensor permits operation in caustic and acidic environments
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Temp rating: 300° F
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Pressure rating: 1000 PSI
Electrodeless conductivity
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Induction: 5 coil system; 28" spacing; 40KHZ induced frequency
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Built in scintillation type gamma ray detector
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Downhole zero calibrate for SN-SP-IND
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16" spacing on SN
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Uses adjustable bowstring centralizer
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Temp rating: 250° F
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Pressure rating: 20k PSI
induction probe
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Continuous recycle on negative voltage, requires 4 minutes for full cycle, two minutes in each direction
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Rugged hi-torque motor with ball screw drive
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Superior corrosion resistance with Nitronics 50 housing
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Standard capacity: 10CC, larger capacity available
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Temp rating: 350° F
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Pressure rating: 20k PSI
Injection tool
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Heavy duty hi-toque motor with ball screw drive
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Pressurized sample size easily changed by using different length or OD of reservoir housing
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Bottom sub encloses sample transfer valve
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Works on single conductor cable
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Standard capacity: 1 liter
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Temp rating: 300° F
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Pressure rating: 5k PSI
Fluid Sampler
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Various lengths and OD's available
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Feed thru can be single or multi-conductor
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Typical material is 303 SS
sinker bars
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Detects minute changes in thermal gradients associated with water communication or gas movement over 0-300° F
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Pressure rating: 5k PSI or 15k PSI depending on model
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High pressure rating and/or H2S resistant housings available
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All models incorporate a fast response platinum sensor
temperature probe
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Plug in microprocessor electronics
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Single transmitter, single receiver emulation
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On the fly down hole pulse or sine calibration signal
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Different isolator frequencies available
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Interfaces with additional pulse type tools
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Anti-coincidence and time share pulsing avoids dead time and signal cancelling of pulse type tools
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Down hole gain control for different pipe sizes
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Rigid low noise isolator provides ruggedness and reliability
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Optional CCL, centralizing bowstrings, gamma, and neutron probe
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Temp rating: 300° F without flask/400° F with flask
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Pressure rating: 20k PSI
Single receiver Bond tool
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Plug in microprocessor electronics
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Dual/single transmitter, dual receiver emulation
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On the fly down hole pulse or sine calibration signal
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Different isolator frequencies available
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Interfaces with additional pulse type tools
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Anti-coincidence and time share pulsing avoids dead time and signal cancelling of pulse type tools
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Down hole gain control for different pipe sizes
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Rigid low noise isolator provides ruggedness and reliability
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Optional CCL, centralizing bowstrings, gamma, and neutron probe
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Temp rating: 300° F without flask/400° F with flask
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Pressure rating: 20k PSI
dual receiver bond tool