By Koichi Tohei
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Additional info for Aikido: The co-ordination of mind and body for self-defence
They showed that formation pressure could be estimated by first plotting ‘d’ values in shale versus depth, on semilog paper, and determining a normal trend line of decreasing values with depth in the normally pressured section. Then, by determining the differences between the extrapolated values of ‘d’ exponent and those calculated from actual data, the correlation was used to estimate the amount of overpressure at any depth. The method developed with Gulf Coast data has been applied worldwide with moderate success.
When the possibility of swabbing is considered high, a short trip of a few stands, or possibly to the last casing shoe and back, may be made, with ‘bottoms up’ then circulated to determine whether a full trip can be made safely. It was noted earlier that if an incorrect hole fill is not noticed at first, it becomes progressively more obvious as more material flows into the hole. Also, if the influx is gas, it freely expands as it percolates up the well. 6 Hole Keeps Flowing Between Stands, While Running In While running the drillstring into the hole, we expect the well to flow the amount of mud being displaced by the drillpipe metal volume.
The rapid expansion of gas near the surface may cause ‘belching’ at the bell nipple with a loss of mud from the well and a consequent drop in the hydrostatic pressure. This may induce further ‘belching’ and lowering of the hydrostatic pressure. This may induce further ‘belching’ and lowering of the hydrostatic pressure to below that of the formation so that a kick may result. This sequence, once started, rapidly gets out of control. 12 DTL 2001 – Rev 1 CONTENTS CONTENTS 1. 1 GENERAL There are a number of warning signs and indications, which alert the drill crew to the presence of a kick, or an impending kick.
Aikido: The co-ordination of mind and body for self-defence by Koichi Tohei