1 / 5

Product

instrumentation cable seriesHermetically Sealed CoreCoaxial High-Data-Rate.374" (9.50 mm) · 73.4 kN

EcoSeal Coaxial 2Q37-EHS Hermetically Sealed Coaxial Cased-HoleHermetically polymer-sealed coaxial cased-hole wireline cable (9.50 mm / .374")

EcoSeal Coaxial 2Q37-EHS Hermetically Sealed Cased-Hole Wireline Logging Cable (.374" / 9.50 mm) featuring a high-bandwidth coaxial copper core, cross-linked ETFE insulation, polymer-encapsulated interstitial barrier and.

Zero Interstitial Gas Migration
High-Rate Coaxial Telemetry
EHS Torque-Balanced
API RP 9B
Order designation
EcoSeal 2Q37-EHS
Nominal outer Ø
9.50 mm
Weight in air
368 kg/km
Breaking strength
73.4 kN
Atten. @ 1 MHz
3.8 dB/km
All sizes (2)
Request a quoteDatasheetWhatsApp
Engineering reply in 2 business hoursCut-to-length export drumsEN 10204 3.1 certificate per drum
Configuration
2Q37-EHS Coax
Center Cu + concentric return
Outer diameter
9.50 mm (.374")
Fits 3/8" flow tubes & sheaves
Breaking load
73.4 kN
16,500 lbf (EHS double armour)
Characteristic Z
50 ± 4 Ω
3–5× mono-cable bandwidth
Temperature
-40 to +175 °C
Cross-linked ETFE ('Q') core
Gas seal
Hermetic matrix
Blocks axial wellbore gas flow

Typical values for this cable type, based on API RP 9B / ISO 13628-5 / ASTM A475 — confirmed in the datasheet and quotation for your order.

Application fit

Is EcoSeal Coaxial 2Q37-EHS right for your machine?

Engineered for high-pressure gas cased-hole logging, downhole video cameras, ultrasonic casing inspection and high-speed production logging where standard mono-conductor cables suffer bandwidth limits or axial gas migration.

Drilling jumbo & rotary mast feed

Suitable

True 50 Ω coaxial geometry delivers 3–5× the telemetry bandwidth of 1N32/1N38 mono cables for real-time downhole video.

Immersion & wet locations

Suitable

Hermetically extruded polymeric encapsulation seals all internal wire interstices against axial high-pressure gas birdcaging.

Vertical / spreader reel

Suitable

Extra-High-Strength (EHS) contra-helical double armour provides 73.4 kN break strength for deep tractor and jar pulls.

Energy chain / drag chain

Not suitable

Oilfield cased-hole wireline logging cable; not for industrial drag chains.

Use PUR-HF Drag-Chain Cable
Typical machinesReal-Time Downhole Video & Optical InspectionHigh-Pressure Gas Well Cased-Hole LoggingUltrasonic & Electromagnetic Casing ImagingDownhole Tractor & Mechanical Pipe RecoveryPlug-and-Perf High-Speed Telemetry

Construction

Layer by layer

EcoSeal Coaxial 2Q37-EHS showing compacted tinned copper centre conductor, cross-linked ETFE dielectric, concentric copper shield/return conductor, hermetically extruded polymeric interstitial seal, and 2-layer EHS steel wire armour.

12345
Schematic, not to scale — generated from the layer data
#LayerMaterial & reference
1Central compacted tinned copper conductor19-wire compacted tinned annealed copper centre conductor (16 AWG / 1.31 mm²)Low-attenuation high-frequency coaxial inner signal/power path
2Code 'Q' cross-linked ETFE coaxial dielectricPrecision concentric cross-linked Ethylene Tetrafluoroethylene (ETFE) rated to +175 °CMaintains controlled 50 Ω impedance and 1,200 V breakdown margin
3Concentric copper coaxial return shield ('2')Helically served flat/round tinned copper coaxial return layer + fluoropolymer barrierProvides a low-loss copper return independent of steel armour impedance
4EcoSeal hermetic polymer interstitial matrixPressure-extruded fluoroelastomer/thermoplastic encapsulation filling 100 % of inner armour voidsPrevents axial gas channeling and drastically reduces grease consumption
5Double contra-helical EHS steel wire armourInner + outer contra-helical Extra-High-Strength (EHS) galvanized or alloy steel armour (.374" / 9.50 mm OD)73.4 kN (16,500 lbf) breaking load

EcoSeal 2Q37-EHS (9.50 mm · .374 in)

Hermetically sealed 50 Ω coaxial cased-hole logging cable with EHS galvanized steel armour

EcoSeal 2Q37-A27 (Sour Service Alloy)

Sour-gas H₂S/CO₂ corrosion-resistant coaxial wireline with Alloy 27-7MO / MP35N armour

Technical data

Ratings & operating limits

Typical values: Typical values for this cable type, based on API RP 9B / ISO 13628-5 / ASTM A475. Values for your order are confirmed in the datasheet and quotation.

Electrical

Characteristic impedance
50 ± 4 Ω (@ 1–10 MHz)
Attenuation @ 1 MHz / 5 MHz
≤ 3.8 dB/km (@ 1 MHz) · ≤ 8.9 dB/km (@ 5 MHz)
Center / shield DC R
14.2 Ω/km (centre) · 9.8 Ω/km (copper shield)
Voltage & IR rating
1,200 V DC/rms · IR ≥ 15,000 MΩ·km @ 500 V DC

Thermal

Continuous operating temp.
-40 °C to +175 °C (+347 °F)
Short-term downhole peak
+190 °C (6 h)
Explosive decompression
Zero core/matrix blistering after 105 MPa CH₄/CO₂ bleed

Mechanical

Min. breaking strength
73.4 kN (16,500 lbf) — EHS armour
Weight in air / fluid
368 kg/km (air) · 302 kg/km (in 1.0 SG water)
Min. sheave diameter
510 mm (20 in)

Resistance

Axial gas block rating
Zero axial gas migration at 105 MPa (15,000 psi)
Grease head efficiency
Reduces grease-injection consumption by up to 50 %
Sour gas option
Available per NACE MR0175 / ISO 15156

Reference standards

Wireline specification
API RP 9B & ISO 13628-5
Armour wire standard
ASTM A475 EHS / UHS grade
RoHS & REACH
2011/65/EU & EC 1907/2006 compliant

Identification

Code breakdown
2 = Coaxial (2-conductor path) · Q = ETFE · 37 = .374" (9.50 mm) · EHS = Extra High Strength
Customs tariff (HS)
8544.2000
Reel documentation
Full TDR trace, attenuation sweep & API RP 9B break test certificate

Sizes

2 standard EcoSeal Coaxial 2Q37 configurations

Mechanical and high-frequency coaxial parameters for 9.50 mm (.374") hermetically sealed wireline.

Mechanical & coaxial telemetry data
Order designationArmour metallurgyNominal Ø
mm		Weight in air
kg/km		Break load
kN		Atten @ 1MHz
dB/km		Enquiry
Hermetically Sealed Coaxial Wireline Cables
EcoSeal 2Q37-EHSEHS Galvanized Steel (+175 °C)9.5036873.43.8
EcoSeal 2Q37-A27 (Sour)Alloy 27-7MO / MP35N Sour Service9.5037468.53.8
  • Typical values for this cable type; dimensions and weights for your order are confirmed in the quotation.
  • Fits standard 3/8 in (9.52 mm) grease-injection flow tubes and sheave wheels.

Quality & approvals

Testing & inspection

Routine tests on every production length, sample and type tests per batch — documented on an EN 10204 3.1 inspection certificate.

  1. ConductorClass 5 stranding
  2. Spark test100 % in-line
  3. Lay-upCores, earth, fillers
  4. SheathingInner, braid / screen, outer
  5. Electrical testsAC voltage, resistance
  6. DimensionsOD, wall thickness
  7. Inspection documents & dispatchDrum & dispatch
Testing & inspectionTest value / referenceFrequency
Routine tests
100 % TDR impedance profile, 1–10 MHz sweep & 3.5 kV dielectric testZ0 = 50 ± 4 Ω with zero impedance spikes and IR ≥ 15 GΩ·kmEvery manufactured reel
Sample tests
Axial high-pressure gas migration & rapid decompression testZero axial gas bypass through internal interstices at 105 MPaType qualification
API RP 9B breaking load & rotational balance testBreak load ≥ 73.4 kN (EHS) with zero birdcagingPer production lot

Inspection certificate

Issued with every drum, listing the routine test results for that length.

Product approvals

API RP 9B & ISO 13628-5ASTM A475 EHS WireNACE MR0175 (A27 Option)

Company certificates

ISO 9001ISO 14001ISO 45001VDE marks approvalUL / cULCE · LVD / EMC

Marking & supply

Ordering & delivery

Sheath marking

Stamped metal reel tag: TEBAOFLEX ECOSEAL COAXIAL 2Q37-EHS .374"
Delivery form
Fumigated wooden drums, steel reels or precision spools
Standard lengths
500 m · 1000 m (or custom cut/spooled lengths)
MOQ
100 m (standard) · 500 m (custom)
Lead time
2–4 weeks ex-works
Incoterms
EXW, FOB, CIF, DAP

Technical documents

Downloads

PDFEcoSeal Coaxial 2Q37-EHS Hermetically Sealed Coaxial Cased-Hole – technical datasheet2 sizes · construction, technical data, approvalsXLSXEcoSeal Coaxial 2Q37-EHS spec data (Excel)All 2 sizes with dimensions and data, for your BOM or quotation
Revision
2026-10-20
Updated
2026-10-20

FAQ

Questions engineers ask first

Not covered here? Send your drawing — an engineer replies within 2 business hours.

Why does EcoSeal Coaxial 2Q37-EHS achieve 3–5× higher data rates than a 1N38 mono-conductor wireline of the same 3/8" size?
In a standard 1N38 mono-conductor cable, high-frequency return currents must flow through the magnetic steel armour wires, causing severe skin-effect resistance and dispersion above 100 kHz. EcoSeal 2Q37 adds a dedicated concentric copper return shield beneath the armour, creating a true 50 Ω coaxial waveguide capable of megabit/s telemetry for real-time downhole video.
What does 'Hermetically Sealed' mean in the EcoSeal 2Q37 construction?
Standard wirelines have microscopic air gaps between the core and inner armour wires that allow high-pressure well gas to migrate up the inside of the cable toward the surface winch drum (causing 'birdcaging' when depressurized). EcoSeal pressure-extrudes a continuous polymeric matrix into every internal void, blocking axial gas migration.
Does 2Q37-EHS require special sheave wheels or grease tubes?
No. Its 9.50 mm (.374 in) outer diameter drops directly into standard 3/8 in (9.52 mm) cased-hole grease-injection flow tubes and 20 in (510 mm) sheaves.
Can EcoSeal 2Q37-EHS also transmit high power for downhole tractors and milling tools?
Yes. Rated to 1,200 V DC/AC with low copper loop resistance (24.0 Ω/km total loop), it simultaneously powers downhole tractors and transmits high-speed telemetry.

Request a quote

Get an engineering quote for EcoSeal Coaxial 2Q37-EHS

Your selection and application details are copied into the enquiry form below.

01Selected sizes

Use + Add next to a size or configuration.

02Reel & motion

Add your operating conditions here to include them in your enquiry.

03Message for our engineers

EcoSeal Coaxial 2Q37-EHS Hermetically Sealed Coaxial Cased-Hole

Selected sizes:


Reel & motion:
- Reel type: 
- Drum core diameter (mm): 
- Cable length on drum (m): 
- Travel speed (m/min): 
- Max. acceleration: 
- Cycles per hour: 
- Length and quantity: 
- Ambient temperature: 
- Exposure (outdoor, water, oil, abrasion): 
- Destination country: 
- Equipment and operating conditions:
Send via WhatsApp

Mono wireline 1N32

Mono Conductor Wireline

Classic 1N22/1N32/1N38 single-conductor wireline cable

View productLightweight hybrid e-line

Enviro-Lite Hybrid E-Line

Smooth polymer-sheathed lightweight hybrid slick E-line

View product7-conductor open-hole

7Q38 / 7H42 / 7J46 Wireline

Seven-conductor double-armoured open-hole logging cable

View product+300 °C downhole DTS

BRUsens DTS BSTE HT

High-temperature downhole optical temperature sensing cable

View product
DatasheetRequest a quote