高强度等四面体树脂固结堵漏剂的研制及应用

Development and Application of a High-Strength Equilateral Tetrahedron Resin Solidifiable Lost Circulation Material

川渝地区在钻井过程中井漏频发,部分区域钻遇复杂地层发生恶性漏失,常常需要多次堵漏或多种堵漏工艺才能封堵成功,严重增加了钻井成本。通过对现有堵漏工艺进行分析,针对裂缝架桥填充原理,通过将高强度等四面体树脂作为主架桥材料、片状树脂及热固性树脂作为充填材料、纤维材料进行缠绕交联后研制成一种一袋式温控胶凝树脂固结堵漏材料YDFD。针对小裂缝,溶洞类、失返性(大裂缝)、呼吸性地层漏失情况,分别选用小、中、大3个型号的一袋式胶凝树脂固结堵漏剂进行级配,通过温控剂调节堵漏浆的固化时间保障施工安全、实现对漏层的精准封堵,在川渝油气井区处理井漏复杂过程中获得93%的一次堵漏成功率,达到了很好的应用效果,该工艺技术在油气田处理井漏难题时可推广应用。

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.