CNPC USA

Drilling Monitoring Sub (DMS)

For detailed specifications and technical information, download the product brochure.

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Contact Information

If you have any questions about this product, please contact us:

Email: thanh.cao@cnpcusa.com

Phone: +1 (832) 257-3456

Address: 22130 Merchants Way Ste. 190 Katy, TX.77449

Specifications

Styled Table
General Specifications
Borehole Size Range8-3/8 in. to 9-7/8 in.
Nominal O.D.6-3/4 in
Maximum O.D.7-3/8 in
Nominal I.D.2 inch
Length114 in
Weight818 lbs
Thread ConnectionsUp-hole connection: 4-1/2 I.F. Box. Down-hole Connection: 4-1/2 I.F. Pin.
Collar MaterialP550 Non-Mag SST
Auxiliary materialsInconel 718, BeCu
Elastomer material (standard)FluoroCarbon 90D - Parker V0709
Elastomer for H2SFluoroCarbon 95D - Parker V1238
Operating Temperature32-347°F / 0-175°C
Max Operating Pressure25,000 psi / 172mPa
Max Overpull (tension)500,000 lbs / 2224kN
Max WOB1,000,000 lbs / 4448kN
Max DLS10 deg / 100 ft
Max Torque30,000 ft-lbs / 40,675Nm
Electronics
Memory life200hrs
Voltage Input20-36 Volts
Power consumption90mA / < 5 Watts
Downhole Memory16 Gb
Interface to MWDRS485/232, or Custom
Mud Content
Max lost circulation materialNo limit
Max sand content %1

Drilling Monitoring Sub (DMS)

CNPCUSA DMS monitors down-hole drilling parameters for improved efficiency and drilling performance. Measurements are simultaneously recorded and transmitted to surface in real time with MWD Telemetry for optimized drilling and improved ROP. DMS allows you to know at-bit dynamics allowing mitigation of shock and vibration: the primary causes of downhole tool failure.

Key Features

  • Real-time BHA diagnostics
  • Real-time and recorded mode measurements
  • Compact design, scalable architecture
  • Real time clock

    • Sour Service

    The DMS utilizes three high-strength, corrosion-resistant alloys: Inconel 718, P550, and Beryllium Copper. Inconel 718 is a nickel-chromium alloy known for its resistance to a wide range of media. Nickel enhances its resistance to both inorganic and organic compounds across a broad pH range, while chromium provides protection against oxidizing and sulfur-containing environments. Additionally, molybdenum contributes to resistance against pitting corrosion. P550 is a manganese-chromium steel alloy with a high nitrogen content. The elevated nitrogen improves resistance to pitting, enhances protection against stress corrosion cracking, and supports the corrosion-resistant properties of chromium. Beryllium Copper is valued for its excellent resistance to stress corrosion cracking and its ability to maintain mechanical strength in hydrogen sulfide (H₂S)* environments.

    * The standard elastomer offers partial resistance to H₂S; however, for environments with H₂S concentrations exceeding 20 ppm, a specialized elastomer is available to ensure enhanced protection.

    Sensors

    CNPC USA employs pressure transducers and drilling dynamics sensors integrated within a specialized collar. Measurement signals are captured, recorded, and processed using a proprietary methodology, offering operational flexibility to deliver both low-resolution real-time data and high-resolution post-run data

    Uses

  • Actual Weight on Bit (WOB) can be utilized to maximize Rate of Penetration (ROP).
  • A combination of WOB, Torque on Bit (TOB), Bending on Bit (BOB), vibration data, and RPM can be used to identify and mitigate drilling dysfunctions such as whirl, stick-slip, bit bounce, and excessive vibrations.
  • Differential pressure aids in assessing mud motor operating conditions.
  • Accurate WOB measurements can enhance sliding efficiency during motor sliding operations.
  • BOB data can reveal localized dogleg severity that may not be detected in standard survey data.

    • Benefits

  • Reduced Operational Risks
  • Maximized drill efficiency and performance
  • Real-time detection of down-hole drilling dynamics problems