Method, system and tool for reservoir evaluation and well testing during drilling operations

A system having a bottomhole measuring instrument secured to a drill string and bit for detecting a kick in a wellbore of a well being drilled into a subsurface formation, comprising:

• a bottomhole measuring instrument having an axially extending tool body and a central, axially developed passage for conveying fluid between first and second axial ends of said tool body,
• radially and axially extending, circumferentially spaced blades carried on an external surface of said tool body,
• fluid receiving recesses defined between said circumferentially spaced blades for receiving fluid located in an area intermediate said external surface of said tool body and the wellbore,
• energy transducers carried by said blades for evaluating fluid contained in said fluid receiving recesses, and
• a kick signaling system responsive to said transducer to evaluate said fluid contained in said fluid receiving recesses for signaling the occurrence of a kick in said well.

A method for evaluating a subsurface formation traversed by a wellbore constructed from a well surface with a drill bit carried at the end of a drill string, comprising:

• establishing a measuring system for measuring a fluid injection rate of fluid injected into the drill string from the well surface,
• taking a first measurement of the rate of fluid flow between said wellbore and said formation with a subsurface flow measurement tool carried on the drill string,
• determining a first location within said wellbore where said first rate of fluid flow is measured,
• determining the fluid injection rate while said first measurement is taken,
• deepening said borehole with said drill bit,
• taking a second measurement of the rate of fluid flow between said wellbore and said formation with said subsurface flow measurement tool,
• determining a second location within said wellbore where said second rate of fluid flow is measured,
• determining the fluid injection rate while said second measurement is taken, and
• correlating the fluid injection rates into the drill string and the locations within said wellbore where said measurements are taken to determine a permeability change between said first and second locations.