Downhole Applications

Commonly used to provide accurate control & measurements during directional drilling, the use of Measured While Drilling “MWD” tools provides real-time information about the conditions at the drill bit. Types of information may include:

  • Formation Evaluation data
  • Rotational speed of the drill string
  • Smoothness of that rotation
  • Type and severity of any vibration downhole
  • Downhole temperature
  • Torque and weight on bit, measured near the drill bit
  • Mud flow volume


  • Lithium Thionyl Chloride (Li-SOCl2)– With its stable operating voltage (3.67V OCV), high energy/power capability and wide operating temperature capability (-55°C to 225°C), Li-SOCl2 has been the chemistry of choice for the oil/gas industry for the past 30 years. Engineered Power manufactures the Li-SOCl2 chemistry for MWD applications in a variety of cell sizes and power/temperature capabilities:
  • Due to drilling depth, it is not practical to power MWD tools from the surface, therefore batteries tailored to operate in high temperatures (up to 225°C) and vibration/shock loads must be deployed. Due to their superior energy density (increased run time), lithium non-rechargeable batteries have become the industry standard over the last 30 years.

Lithium Carbon MonoFlouride (Li-CFx) was developed in the 1970’s and has been utilized in numerous consumer and aerospace/defense applications. With its high temperature stability & energy density, long life and enhanced safety, Engineered Power has tailored the Li-CFx chemistry for MWD applications. However with a lower operating voltage (3.2V OCV) than LiSOClO2, Engineered Power works with our customers to analyze battery voltage and envelope constraints.

Currently Engineered Power offers the following cells with the Li-CFx chemistry: