초록 ▼

An oil well drilling rig (10) recirculates drilling mud which is analyzed continuously by pumping it through a gas separation unit (72) where the gases in the mud become separated and mixed with a carrier gas and are conveyed to gas analyzing devices (196) where the concentration of the different hy

An oil well drilling rig (10) recirculates drilling mud which is analyzed continuously by pumping it through a gas separation unit (72) where the gases in the mud become separated and mixed with a carrier gas and are conveyed to gas analyzing devices (196) where the concentration of the different hydrocarbon components of the gases in the mud are continuously measured and the signals representative of these measurements are processed together with mud flow rate, and the carrier gas flow rate or the sample gas flow rate signals in a signal processor (64) to provide a continuous log of gas component concentration during drilling.

대표청구항 ▼

In the logging of a well during drilling thereof, the method of producing a logging signal which represents, on a continuous basis, the instantaneous concentration of a given gaseous component in drilling mud as it is being returned from the well, said method comprising the steps of: continuously su

In the logging of a well during drilling thereof, the method of producing a logging signal which represents, on a continuous basis, the instantaneous concentration of a given gaseous component in drilling mud as it is being returned from the well, said method comprising the steps of: continuously subjecting at least a portion of said drilling mud being returned from the well to gas separation to separate gas containing said gaseous component from said portion of the returned mud; continuously and simultaneously subjecting the separated gas to analysis to produce a gaseous component concentration signal whose value at any instant corresponds to the concentration, at that instant, of said given gaseous component in the separated gas; producing a continuous mud flow rate signal whose value at each instant corresponds to the rate of flow of drilling mud from which the gas is separated; producing a continuous gas flow rate signal whose value at each instant corresponds to the rate of flow of gas separated from said drilling mud; and continuously processing said gaseous component concentration signal, said mud flow rate signal and said gas flow rate signal to provide a continuous logging signal whose value at any instant corresponds to the product of the concentration at that instant of the given gaseous component and the rate of flow at that instant of gas separated from said drilling mud divided by the rate of flow at that instant of the drilling mud.