Patent ID: 9739141
Date: 2017-08-22
CPC Classifications: E21B

Claim:
1. A data transmission system for transmission of downhole measurement while drilling data to ground, comprising: a drill string mounted with a logging while drilling measurement tool, and a throw while drilling section, which is provided on the drill string and accommodates a micromemory, the throw while drilling section including a housing which is mounted outside of the drill string as a sleeve to form a clearance space therebetween; a control circuit provided in the clearance space, configured for receiving and transmitting downhole measurement data measured by the logging while drilling measurement tool; and a wireless transceiver connected to the control circuit, configured for writing the downhole measurement data received by the control circuit into the micromemory, wherein the throw while drilling section releases, under function of a micromemory release instruction transmitted by the control circuit, the micromemory loaded with the downhole measurement data to the ground, wherein the housing of the throw while drilling section is provided with a micromemory release hole on a side wall thereof, and the micromemory loaded with the downhole measurement data is, via the micromemory release hole, released into an annular space formed between the drill string and a borehole wall, so that the micromemory is returned to the ground along with circulation of slurry, wherein the throw while drilling section further comprises: a power mechanism which is connected to the control circuit and controlled under function of the micromemory release instruction transmitted by the control circuit; and a micromemory release mechanism, wherein the micromemory release mechanism comprises a micromemory temporary storage, which, at a first state of the micromemory release mechanism, temporarily stores the micromemory loaded with the downhole measurement data, and at a second state of the micromemory release mechanism, rotates under action of the power mechanism, so that the micromemory loaded with the downhole measurement data is released into the annular space via the micromemory release hole.