Downhole Probe (Survey Tool)

Product Specifications

Technical details and manufacturing context for Downhole Probe (Survey Tool)

Definition

A downhole probe, also known as a survey tool, is a critical component of a directional survey system used in oil and gas, mining, and geotechnical drilling. It is lowered into the borehole to measure and transmit real-time data on the wellbore's inclination, azimuth (direction), and sometimes toolface orientation. This data is essential for ensuring the drill string follows the planned trajectory, enabling precise directional drilling, well placement, and geological evaluation. The probe contains inertial sensors (such as accelerometers and magnetometers or gyroscopes) housed in a pressure-resistant casing. As it travels downhole, these sensors measure the Earth's gravitational and magnetic fields relative to the tool's orientation. This raw sensor data is processed by an onboard electronic package to calculate the borehole's inclination and azimuth. The data is either stored in memory for later retrieval or transmitted in real-time to the surface via mud pulse telemetry, electromagnetic signals, or wired pipe. The probe is designed for harsh downhole environments, with a pressure-resistant housing made of non-magnetic stainless steel (316L) and high-strength alloy steel components. It operates within a temperature range of -40 to 85 °C and a supply voltage of 9–36 V DC, with power consumption of 1.5–3.0 W. It provides an output signal of 4–20 mA (two-wire loop) and has an ingress protection rating of IP67–IP68. The measurement range for inclination is 0–180° with an accuracy of ±0.1° at 25 °C, and for azimuth it is 0–360° with an accuracy of ±0.5° at inclination > 5°. The probe weighs 2.5–4.0 kg and has a diameter of 25–45 mm, fitting standard drill strings. It is important to verify model-specific values and standards with the legal manufacturer or supplier, as the listed parameters are reference ranges for directory purposes.

Working Principle

The probe contains inertial sensors (accelerometers, magnetometers, or gyroscopes) in a pressure-resistant casing. As it travels downhole, these sensors measure the Earth's gravitational and magnetic fields relative to the tool's orientation. An onboard electronic package processes the raw sensor data to calculate the borehole's inclination and azimuth. The data is either stored in memory for later retrieval or transmitted in real-time to the surface via mud pulse telemetry, electromagnetic signals, or wired pipe.

Common Materials

High-strength alloy steel, Non-magnetic stainless steel (for sensor housing), Pressure-resistant elastomers (for seals), Electronic components (PCBs, sensors)

Technical Parameters

Parameter	Typical range	Notes & selection driver
Operating Temperature	-40–85 °C	Outside this range, electronics may fail
Ingress Protection	IP67–IP68	For wet environmentsIEC 60529
Supply Voltage	9–36 V DC	Reverse polarity protected
Power Consumption	1.5–3.0 W	At nominal voltage
Measurement Range (Inclination)	0–180 °	Full range
Accuracy (Inclination)	±0.1 °	At 25°C
Measurement Range (Azimuth)	0–360 °	Full range
Accuracy (Azimuth)	±0.5 °	At inclination > 5°
Output Signal	4–20 mA	Two-wire loop
Housing Material	316L	Corrosion resistantASTM A276
Weight	2.5–4.0 kg	Depending on length
Dimensions (Diameter)	25–45 mm	Fits standard drill strings

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Sensor Module
Houses the accelerometers and magnetometers/gyros that measure inclination and azimuth.

Material: Non-magnetic stainless steel
Electronic Cartridge
Processes raw sensor data, performs calculations, and manages data storage/transmission.

Material: Printed Circuit Boards (PCBs), electronic components
Pressure Housing
Protects internal components from extreme downhole pressure and fluids.

Material: High-strength alloy steel
Connector/Interface Part
Provides electrical connection to the rest of the survey system or telemetry module.

Material: Corrosion-resistant alloy, elastomer seals
Battery Pack
Powers the probe's electronics during downhole operation (for memory tools).

Material: Lithium-based cells, housing

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Downhole Probe (Survey Tool).

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Survey System

View system integration details

Manufacturers of Downhole Probe (Survey Tool)

Manufacturer profiles associated with Downhole Probe (Survey Tool).

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Frequently Asked Questions

What is the operating temperature range?

The operating temperature range is -40 to 85 °C. Outside this range, electronics may fail. Confirm the temperature rating for your specific downhole environment.

What is the ingress protection rating?

The ingress protection rating is IP67–IP68, suitable for wet environments. This rating indicates resistance to dust and water immersion. Verify the rating for your specific model.

What is the accuracy of inclination and azimuth measurements?

Inclination accuracy is ±0.1° at 25 °C, and azimuth accuracy is ±0.5° at inclination > 5°. These values are reference ranges; confirm the accuracy for your specific probe model.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification

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pressure:	Up to 25,000 psi
flow rate:	0-500 gpm
temperature:	-40°C to 175°C
slurry concentration:	Up to 15% solids by weight

Product Specifications

Industry Taxonomies & Aliases

Applied To / Applications

Industrial Ecosystem & Supply Chain Structure

Application Fit & Sizing Matrix

Reliability & Engineering Risk Analysis

Compliance & Manufacturing Standards