A kicks in drilling can be defined as a well control problem in which the pressure found within the drilled rock is greater than the mud hydrostatic pressure acting on the borehole . When this occurs, the greater formation pressure has a tendency to force formation fluids into the well bore. This fluid flow is […]
WELL KILLING METHODS Read More »
A kick can be defined as a well control problem in which the pressure found within the drilled rock is greater than the mud hydrostatic pressure acting on the borehole . When this occurs, the greater formation pressure has a tendency to force formation fluids into the well bore. This fluid flow is called a
Introduction to kicks in drilling Read More »
Movement of drill string down hole creates pressure surges in the borehole. These pressure surges could either add to the BHP (+ve surge) or reduce the BHP (-ve surge) depending upon whether the pipe is being lowered or pulled out of the well. The +ve pressure surges commonly known as ‘surge pressures’ if excessive can
SWAB AND SURGE EFFECTS Read More »
As the rock layers are deposited one upon another, formation water is squeezed out of the pores due to the overburden. This process is called compaction. As long as the formation water has escape avenues, the formation pressure bleeds down to the ‘normal value’. The generally accepted normal value is ranging from 0.433 to 0.465
Normal & Abnormal pressure of reservior Read More »
Casing Casing has several important functions during the drilling and completing of a well. It is used to prevent the borehole from caving in during the drilling of the well, to provide a means of controlling fluids encountered while drilling, to prevent contamination of fluids to be produced, and to protect or isolate certain formations
Oil Well Casing Design Read More »
Jet Nozzles Jet Nozzles were introduced into the oilfield in 1948. These were necessary to increase bottom hole cleaning in deep wells. Prior to jet nozzles, the fluid course in bits was a hole bored into the center of the bit and the drilling fluid went from the drillstring directly into the annulus. These “conventional
Drill Bit Hydraulics and optimisation Read More »
