Development of Underground Movable Vibration Cementing System Based on Eccentric Oscillator
A comprehensive analysis of domestic and foreign vibration cementing technology was conducted,and the results showed that during the cementing waiting process after drilling the casing,vibration waves were generated by using vibration cementing tools or equipment,and vi-bration compaction effects were generated on the casing and cementing mud,thereby improving the quality of cementing completion.Most of the existing vibration cementing tools are placed at the wellhead,fixed at a certain position in the wellbore,or fixed at the bottom of the casing,and cannot be recycled,which cannot improve the vibration cementing effect of the entire wellbore section.Based on the mechanical theory of eccentric oscillator,a new type of reusable and recov-erable downhole movable oscillator has been developed to form a complete set of vibratory cemen-ting system,which can play a role in any position of the whole well section during the whole ce-menting process,and at the same time,it has no influence on the normal cementing and other equipment.Indoor and field tests have shown that this movable downhole vibratory cementing system can improve the compressive strength by 4％and cementing strength by 7％for wells that have been waiting for cementing for less than 2 hours,and significantly improve the quality of cementing at the second interface,with strong economy and broad prospects for promotion and application.
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