SK-TMWD Pro Wireless MWD
The SK-TMWD Pro wireless measurement while drilling instrument is an ultra-high temperature MWD system compatible with the Tensor standard. It mainly measures downhole parameters such as well inclination, azimuth, gravity tool face, magnetic tool face, gravity and magnetic field, temperature, gamma (optional), azimuth gamma (optional), water eye and annular pressure (optional). It is suitable for high-temperature, high-pressure deep wells and ultra-deep wells in unconventional oil and gas exploration and development. The SK-TMWD Pro system adopts a modular design. Its mechanical, electrical and software systems are independently developed by SK. It can be quickly iterated and upgraded according to user needs, accurately measure well inclination and azimuth, provide real-time vibration and impact data, and can be easily and efficiently transported and assembled at the drilling site.

Product Features Applicable to ultra-deep wells with high temperature, high pressure and high vibration Optimize decoding performance for deep well and ultra-deep well conditions Flexible connection of pulser: lower seat key can be salvaged; upper hanging pulser can adapt to plugging agent well conditions High-precision directional sensor to ensure accurate trajectory Integrated dynamic well inclination measurement to reduce pump stop time for inclination measurement Carefully optimized process and design to achieve high reliability Strong scalability: azimuth gamma, compensated resistivity, azimuth resistivity, torque while drilling short joint, annulus/water eye pressure, near drill bit and other joint applications.

185℃ 20000/25000Psi Maximum Operating Temperature Maximum Working Pressure
Mechanical Specifications
Probe outer diameter1.875 in.
Drill collar outer diameter3.5 in.4.75 in.6.75 in.8.25 in.9.5 in.

Drill collar type

23/8in. IF31/2in. IF41/2in. API IF65/8in. API Reg75/8in. API Reg
Drill collar equivalent stiffness2.96 in. x 2.25 in.4.75 in. x 2.81 in.6.71 in. x 3.25 in7.93 in. x 4.00 in.9.42 in. x 4.00 in.
Makeup torque3,500 lbf-ft9,600 lbf-ft30,000 lbf-ft54,000 lbf-ft62,000 lbf-ft
Working displacement75-165usgpm100-300usgpm150-800usgpm400-1200usgpm400-1200usgpm
Maximum dogleg rotation50º/100 ft15º/100 ft10º/100 ft8º/100 ft4º/100 ft
Maximum dogleg sliding100º/ 100 ft30º/ 100 ft21º/ 100 ft14º/ 100 ft7º/ 100 ft
Maximum operating temperature185ºC
Maximum temperature tolerance200℃
Maximum working pressure20,000 / 25000Psi
Recommended sand content≤1%
Maximum plugging material content40-50 lb/bbl uniform mix



Directional Sensor Characteristics
Directional SensorTriaxial Fluxgate Quartz Accelerometer
Directional measurementRangeResolution (MWD)Accuracy
Well0‒180º0.1º± 0.1º
Azimuth0‒360º1.0º± 0.5º
Magnetic Tool Face0‒360º1.0º± 0.5º
Gravity Tool Face0‒360º1.0º± 0.5º
Magnetic Field Sum0‒100 µT0.01 µT± 0.075 µT
Dip-90‒90º0.1º± 0.15º
Gravity Sum0‒1.000 g0.001 g± 0.001 g
Temperature SensorInternal Integration
Temperature measurement range-20 ‒ 200 ℃0.1 ℃±1 ℃


Gamma Sensor Characteristics
Storage Update Rate7.2 samples/ft at 50 ft/hr
Real-Time Update Rate3.6 samples/ft at 50 ft/hr
Gamma Resolution1 API
Gamma Sensitivity2.5 Count/API
Minimum sampling periodDownhole storage 10s
Maximum data storage800+ hours