Flow Field Analysis in Data Memory Releasing Device

Abstract

Electromagnetic wave and mud pressure wave data transmission technology cannot achieve a large amount of data uploading transmission rate in downhole, which cannot meet the transmission requirement of logging while drilling (LWD) data and geosteering service data. A new while-drilling data transmission system through micro-chip memory releasing was introduced in this paper. Plenty of micro-chip memories were installed in cavity of the releasing device, and were injected measurement data of LWD according to instructions, then were released to annulus regularly or irregularly, the memories will be carried to the surface by mud flow, so the stored data was transmitted to ground. A downhole releasing device is designed to releasing memories, flow channel of which is a decisive factor of this technology. Numerical simulation method is used to analyze flow field in data memory releasing device flow channel, the results of which show that outlet flow pressure will not damage borehole stability.