| dc.description.abstract | Early kick detection while drilling is a great concern in the oil and gas industry. Many kick detection methods have been developed some of which could reveal the occurrence of kicks as earlier as possible to avoid danger from blowouts and other related disasters.
With all the existing methods, simple but accurate and reliable methods of kick detection which could use downhole measurements need to be developed. In this case we consider the situation when the drill bit is held still (in the axial direction) off bottom and rotating. If we have a weight measurement at the top of the BHA then this measurement should give a fairly good estimate of the BHA weight multiplied by the Buoyancy factor, adjusted for the geometry. That is the counter forces from the ground.
If we are certain about the geometry and the assumption that friction is irrelevant because of rotation, then this measurement can be converted to a bulk density in the area around the BHA. This can be used to detect kicks.
The mass spring model, or another model, could be used to calculate the effect of geometry on the weight. It is also worth taking into account a probability model for the geometry to be able to discern between when is it a kick and when is it just the assumptions of the geometry that is wrong. | |
