Patent ID: 9726007
Date: 2017-08-08
CPC Classifications: E21B,G01V

Claim:
1. A downhole survey system including a drillstring first tube portion configured for connection to further tube portions of a drillstring via respective connections, which comprises a first hollow tube portion having a side wall portion of non-ferromagnetic material, and at least one downhole survey device mounted to a recess in the non-ferromagnetic material or bonded to the non-ferromagnetic material or embedded in the non-ferromagnetic material or set into the non-ferromagnetic material, the survey device including at least one survey instrument to obtain survey data, a power source and wireless communication device to wirelessly receive and/or transmit obtained survey data to a core orientation device or to another electronic instrument inserted into the drillstring first tube portion and arranged to pass the survey device during transit of the core orientation device or the other electronic instrument within the drillstring first tube portion and to retrieve and store the obtained survey data by wireless transmission of the survey data between the survey device and the core orientation device or the other electronic instrument during said transit subsequent retrieval of the core orientation device or the other electronic instrument to the surface with the stored survey data.