BPM measuring while drilling system

BPM mwds

BPM mwd

Measuring-While-Drilling System
MWDS Overview
CGDS172NB Near-bit Geosteering Drilling System is the drilling equipment that is researched and developed jointly by Drilling Engineering Technology Research Institute of China National Petroleum Corp., Beijing Petroleum Machinery Factory and the Logging Instrument Plant of CNPC Logging Limited Company. The geosteering drilling technology is new advanced drilling technology publicly recognized by the international drilling industry, which is integrated with drilling technology, logging technology and oil reservoir engineering technology and utilize near-bit geologic and engineering parameter measurement and drilling control measures to guarantee that the actual wellbore goes through the reservoir bed and get the best position and, according to the characteristic stratum information measured while drilling, adjust and control the track of the well bore in a real-time manner so that the drilling bit can go along with the path of the “oil taste”. Therefore, it has such characteristics as strong function to recognize oil and gas strata while drilling and strong steering function.
Structure of the MWD System
CGDS172NB Near-bit Geosteering Drilling System is composed of measurement data transmission motor (CAIMS), wireless receiving system (WLRS), positive-pulse wireless MWD (CGMWD) and ground information processing and steering decision-making software system (CFDS),
Functions of CGDS172NB Near-bit Geosteering Drilling System
CGDS172NB Near-bit Geosteering Drilling System has three functions: measurement, transmission and steering: 1) Measurement: In the near-bit measurement transmission spool, there is resistivity sensor, natural gamma sensor and well inclination sensor installed; in the wireless short-distance transmission receiving spool there is receiving coil installed. The near-bit measurement transmission spool can measure resistivity of drilling bit, azimuth resistivity, natural gamma and near-bit well inclination and angle of tool face and these parameters can be converted into electromagnetic wave signals and then transmitted by the wireless short-distance transmission transmitting coil to the receiving coil in the wireless receiving spool over the steering screw motor in a time-sharing manner. 2) Transmission: After the wireless receiving coil has received the information from below the motor, it will be incorporated by the data connection system to the CGMWD positive pulse MWD system located above it, then CGMWD will activate the positive pulse generator to produce the pressure pulse signals in the slurry channel in the drilling column and transmit the measured near-bit information (partial) to the ground processing system, while uploading the information measured by CGMWD including well inclination, azimuth, tool face and downhole temperature and other parameters. 3) Steering: after receiving and collecting the slurry pressure pulse signals uploaded by the downhole instrument, the ground processing system will filter the information, reduce its noise, check, identify, decode, display and store the information and then, transmit the decoded data to the driller display for the engineer to read; at the same time, the CFDS steering and decision-making system will judge it and make a decision and use the downhole steering motor (or rotary table drilling tool assembly) as the steering tool to instruct the steering tool to drill into the destination oil and gas layer exactly or continue to drill in the oil and gas reservoir.