초록 ▼

The system of the present invention includes measurement instrumentation that is located in or near the drill bit and used in a measuring-while-drilling system. The instrumentation can be located in a bit box, an extended sub between the drilling motor assembly and the bit box or in the drill bit. T

The system of the present invention includes measurement instrumentation that is located in or near the drill bit and used in a measuring-while-drilling system. The instrumentation can be located in a bit box, an extended sub between the drilling motor assembly and the bit box or in the drill bit. The drill bit is connected directly to the bit box or extended sub. The close proximity of the instruments to the drill bit allows for more reliable and useful measurements of drill bit, drilling and formation conditions. The bit box houses instruments that measure various downhole parameters such as inclination of the borehole, the natural gamma ray emission of the earth formations, the electrical resistivity of the earth formations, and a number of mechanical drilling performance parameters. Sonic or electromagnetic signals representing these measurements are transmitted uphole to a receiver associated with receiving equipment located uphole from the drill bit.

대표청구항 ▼

[ We claim:] [1.] A system for making downhole measurements during the drilling of a borehole using a drill bit at the bottom end of a drill string, said system comprising in combination:a) a drill bit connecting means for connecting said drill bit to said drill string, said connecting means contain

[ We claim:] [1.] A system for making downhole measurements during the drilling of a borehole using a drill bit at the bottom end of a drill string, said system comprising in combination:a) a drill bit connecting means for connecting said drill bit to said drill string, said connecting means containing one or more instruments for making downhole measurements near said drill bit;b) a first telemetry means located in said connecting means capable of transmitting signals to and receiving signals from an uphole location; andc) a second telemetry means located uphole from said first telemetry means for communicating with said first telemetry means.