Development of the Downhole Data Memory Releasing Device

With the development of geologic mapping and resource evaluation technology, traditional data transmission method, such as mud pulse telemetry and low-frequency electromagnetic telemetry, can't meet the requirement of large amount of LWD data transmission in downhole. This paper gives a new transmission method of LWD data by releasing radio frequency (RF) memories while drilling a well. A downhole sub available to releasing radio frequency memories is designed in this paper. Plenty of RF memories with LWD data are located in cavity of the releasing sub, and were released into the annulus regularly, which will return to the surface following mud circulation. In order to expand the storage capacity of the memories, wireless charging high capacity RF memories are designed, the capacity of which depends on the energy transferred from the RF reader in the releasing sub. At last, the memories are collected at the surface, and the data storied in them are read out and analyzed, which can be used to guide the drilling process.