The Downhole Seismic Source Design For Anti-collision Monitoring In Cluster Wells

The anti-collision system based on the detection of vibration wave signal is that thevibration wave generated by the drill bit breaking rock or the downhole seismic source iscollected by the acceleration sensor, and then transmits it to a computer for analysis andprocessing so as to achieve monitoring and warning function. But the deeper the well is, themore the signal attenuation is. So it becomes more and more difficult to extract effectivesignal which brings a certain limit in the field application. In order to achieve theanti-collision requirement more effectively, the specialized downhole seismic source isdesigned to produce the intensive vibration with certain characteristics, which can provide theremarkable signal for the system.This thesis researched the domestic and international downhole seismic source andintroduced the structure and working principle of some tool. The basic working principle anddesign of underground anti-collision source were discussed. It is confirmed that the downholesource adopts mechanical principle for shocking, and the spring element was used as theenergy storage mechanism, the arc card was used as locking mechanism of the structure, Thisthesis completed the design of the downhole seismic source structure and the key components.The checking and stress analysis of key components were done based on the basic theory ofmechanics of materials and Ansys finite element simulations.So some structures wereimproved and optimized. This thesis completed downhole seismic source assembly drawingsand supporting the dynamic sampling sensors and the impact of the corresponding equipment.The testing block is designed based on the structure of source to do the seismic source labtest. One day the testing block and the downhole seismic source were produced, assembledand debugged. We get the size of the impact force of the downhole seismic source by the labtest. The test results showed that: the downhole seismic source has reasonable structure. It completed the design movement and function well and Achieve the design goal.