Mud-Pulse Measurement While Drilling (MWD)

Specifications

In modern oil industry, wells are far more sophisticated than just a simple vertical bore, instead, horizontal drilling are quite often once the appropriate depth has been reached. Measurement While Drilling (MWD) was developed to meet the challenge by providing wellbore position, drillbit information, directional data and real-time drilling information, as well as determining borehole inclination and azimuth during drilling. MWD obtains real-time measurements downhole, such as gamma rays, temperature, soil resistivity, pressure, drill angle, etc., and transmits them to the surface for analysis. Some MWDs have the ability to store the measurements in solid-state memory for some time. Data is transmitted as pressure pulses through the mud slurry and electromagnetic telemetry.

Our MWD was designed to meet varying needs of hole diameters, flow rates and other drilling requirements. The positive pulse system with minimum moving parts extends downhole life, simplifies maintenance and offers low resistance to flow ranges from 10 to 551/s. The downhole assembly is modular, which ensures easy handling and maintenance. The probe power requirement is low, providing better operating economy and longer battery life. Its outer diameter is 48mm and suitable for all hole diameters. The system consists of a downhole equipment and a surface equipment. The downhole equipment, which gathers and transmits data, composes of Directional Probe, Pulser, Gamma Detector Probe and Battery Housing. Surface equipment composes of Power Supply Box, Remote Data Processor, Pressure Transducer and Computer that perfom data reception, processing and display.

Specifications:

Inclination accuracy: ±0.1°

Azimuth accuracy: ±1.0°
Tool Face accuracy: ±1.0°

Max Operating Temperature: 150°C
Max Pressure: 100MPa

Pressure barrel outer diameter: Φ48mm
Natural Gamma:
Sensor: Scintillating crystal + Photomultiplier tube
Recommended minimum sample period: 10 seconds
Measurement range: 0~500API
Measurement accuracy: ±3API (0~150API)/±10API (150~500API)
Max data storage capacity: 110,000 groups
Sensitivity: better than 1.6 CPS/API
Vertical resolution: better than 130mm
Recommended measurement speed: ≤30 m/h
Total length of the system: 6.8m (without Gamma)/8.8m (with Gamma)