Drilling fluid wireless drilling tool ground-to-downhole instrument control system and control method

Abstract

The invention discloses a control system and a control method for controlling a down-hole instrument of a wireless measurement-while-drilling instrument from the ground by the aid of drilling fluid. The control system comprises a vibrating plate. The vibrating plate is arranged in a centralizer, a tri-axis acceleration sensor and an MCU (microprogrammed control unit) are mounted on the vibrating plate, the tri-axis acceleration sensor is connected to an AD (analog-to-digital) conversion module of the MCU, and the MCU receives start and stop signals of a ground mud pump and transmits trigger signals to the down-hole instrument of the wireless measurement-while-drilling instrument. The control system and the control method have the advantages that the problem of instability of an existing control system in a control procedure is thoroughly solved, the down-hole instrument can be efficiently and reliably controlled, the well drilling efficiency is improved, and labor and materials are saved.

Description

technical field [0001] The invention relates to a control system, in particular to a control system and a control method for a ground-to-downhole instrument of a drilling fluid wireless drilling tool. Background technique [0002] The Drilling Fluid Wireless LWD Tool is powered by batteries. When the drilling is stopped, the downhole tools should not consume power. For this reason, whether the downhole instrument is working or not and the working mode is controlled by the ground, and it is controlled by the opening or stopping of the mud pump. There are two effects on the downhole when the mud pump is turned on and off. One is that when the mud pump is turned on, the drill pipe (the wireless drilling tool is installed on the drill pipe) will vibrate due to the flow of mud; the other is that the mud will circulate . [0003] In the past, two methods were usually used to make the downhole equipment receive the mud pump start signal. One is to install a mechanical switch in t...

AI Technical Summary

Problems solved by technology

[0004] However, in the process of use, the above two methods are unstable. The mechanical switch of the former is often damaged, and the latter often needs to install a large number of shock-absorbing devices in complex underground environments, which directly leads to insufficient response sensitivity of the instrument and unreliable work. , some wells work, some wells do not, in the same well, some layers work, some layers do not

And once this happens, it is necessary to lift several thousand meters of drill pipe from the underground, replace the instrument or mechanical switch, and then put down the drill pipe again. The loss reaches tens of thousands of yuan each time.

Images