Surefire is a real-time MWD survey tool designed to provide unmanned monitoring of wellbore deviation. It provides an intermediate solution between time consuming and inaccurate wireline survey tools and expensive steerable MWD systems.


Data Transmission Type

Positive Mud Pulse

Available Tool Sizes

4.75" (122mm) with 3 1/2" IF, 150-350gpm
6.50" (165mm) with 4 1/2" XH, 250-600gpm

8.00" (203mm) with 6 5/8" Reg, 400-750gpm

Nominal Length

8 ft

Power Supply

Lithium Thionyl-Chloride High Temperature Batteries

Shock Limit / Vibration Limit

1000g, 0.5ms / 20G RMS Random 50-500Hz

Operating Temperature

32 ° to 302 ° F

Survival Temperature

-40 ° to 329 ° F

Hydrostatic Pressure (max)


Pressure Drop

~50psi @ 350 gpm water

LCM Tolerance (max)

60-80 ppb medium nut plug, premixed

Sand Content

<5%, <2% optimal

Inclination Sensor Accuracy / Repeatability

± 0.2 ° / ± 0.05 °

Data Telemetered

Survey Procedure

Pumps off for 60 seconds, Pumps on for 3

Angle Range/ Resolution 0°- 6° / 0.1°
6°- 16° / 0.25°
16°- 29.5° / 0.5°

System Health Data

tgf, Battery Hours Remaining,Tool Temperature

Built around a proprietary mud pulser, high shock rated solid state sensors and rugged control electronics, the Surefire Angle Only Survey Tool provides a robust and cost effective surveying option for vertical wellbores. It dramatically reduces survey times when compared to wireline or memory survey tools and maximizes useable rig time in drilling operations.


The Surefire Angle Only Survey Tool implements a high torque, high wear rotary shear valve and provides increased reliability and durability in contaminated mud systems. It also has significantly superior tolerance to LCM and solids when compared to conventional pulser designs that utilize small screens and inlets which are susceptible to blockages.

Unlike other currently available survey tools which only transmit wellbore inclination to the surface, the Surefire Angle Only Survey Tool also provides Total Gravity Field values drastically reducing the risk of bad surveys. System health parameters such as downhole tool temperature and tool battery life are also transmitted. Surveys are initiated by simply cycling the mud pumps off and on. The total survey time is less than 3 minutes.

Data telemetered from the downhole tool is decoded and displayed automatically by the Surefire Surface System. The Surefire Surface System has a small footprint and integrates easily into the crowded workplace in the dog house. It is touchscreen enabled and features an easy to use interface that can be mastered in minutes. The driller can view real-time graphs of pressure data and filtered pulse data, and can also visualize the wellbore using inclination plots and maximum departure curves.

The Surefire Surface System has extensive data logging and report generation capabilities. Survey reports can be exported using the built in USB port in PDF and CSV formats. The Surefire Angle Only Survey System is logistically friendly and ships ready to run in an 8 ft
drill collar. The entire system can be installed, initialized and operational in less than 30 minutes.

Click here to view the Surefire information in a detailed and print-friendly brochure format (.pdf).