Page 149 - Origin and Prediction of Abnormal Formation Pressures

> z 0 -0 z m E! 2 P n $ concepts (using cables, drillstring, or mud system); analysis of Z B s $ 2 u 5 ?( ;a C, c" z

Drilling rate, torque, drag, hole fill-up (reaming), modified d-exponent, analytical drilling model

Drilling and well logging overpressure detection and evaluation techniques (after Fertl and Chilingarian, 1987, table 11, 8. p. 28)

Electrical and acoustic-type transmission drillstring vibrations; downhole gas detection tool. Mud weight, gas content, temperature, flow rate, hole fill-up, pit level and total pit volume, salinity (resistivity, conductivity), well kicks. Density, shape, size, color, volume over shale shaker, moisture content, 'lithofunct

Variables concepts. cross-section

Drilling parameters (instantaneous) Logging-while-drilling (instantaneous or Drilling mud parameters (while drilling, but delayed Drill cutting analysis (while drilling, but delayed by time required for sample return) geophysical well logs Well logging parameters -

TABLE 5-1 Techniques semi-instantaneous) by circulation lag-time)