Lost circulation during drilling is a downhole problem frequently encountered in the Chuanyu area,and in part of the area,severe lost circulation encountered in complex formations can only be cured after several times of operation and with different lost circulation control techniques,resulting in high drilling cost.By analyzing the lost circulation control techniques used in the past,a one-sack temperature-control gel-type resin lost circulation material(LCM)YDFD was developed based on the principles of bridging and packing in fractures.The raw materials in producing the LCM YDFD include a high-strength equilateral tetrahedron resin as the main bridging material,a flaky resin and a thermo-set resin as the packing material,and a fiber material,and these three materials,by entanglement crosslinking,produce the final product YDFD.In lost circulation control,three models of YDFD,which are small,medium and large,are mixed in a certain ratio to combat mud losses of different rates such as mud losses into small fractures,vugs,big fractures and another type of mud loss called breathing loss.Into the LCM slurry a temperature control agent is used to regulate the time required for the LCM slurry to solidify,thereby ensuring safe operation and accurate plugging of the channels into which mud is lost.In controlling lost circulation with the YDFD LCM in the Chuanyu area,93%mud losses are successfully brought under control in the first try.This technique is worth trying in combating mud losses in oil and gas development.
关键词
堵漏材料/高强度等四面体树脂/温控固结承压堵漏技术/现场试验
Key words
Lost circulation material/High strength equilateral resin/Temperature-control solidifiable lost circulation material/Field test
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