“死泥浆”影响界面胶结力学性能的实验研究

Experimental Study on Effect of Died Mud on Mechanics Performances of Interface Cementation in Cementing Job

关键词:  水泥浆 死泥浆 界面胶结力学性能 评价 机理

Key words:  cement slurry, died-mud, mechanics performances of interface cementation,evaluation, mechanism

摘要:

针对目前油田常用来改善界面胶结强度的水泥浆体系，以窝存的“死泥浆”为基础，系统评价了四种界面组成条件下的胶结力学性能。实验结果表明，若固井二界面没有窝存的“死泥浆”，早强型水泥浆可使界面胶结强度提高97．62％，但当有窝存的“死泥浆”存在时，它对固井二界面胶结强度的改善效果就十分有限甚至起反作用；窝存的“死泥浆”对增强型水泥浆与模拟岩心之间的胶结强度则影响相对较小，且在各种钻井液混入比例条件下，其固井二界面胶结强度均明显高于纯水泥浆和早强型水泥浆。探讨了早强型水泥浆和增强型水泥浆的胶结强度强化机理，提出了从根源上解决层间窜问题的有效途径。

Abstract:

In view of the cement slurry system that improve the interface cementation strength, the cementation mechanics performance under four kinds of contact interface composition conditions are systematically evaluated based on the died mud. If there has not th