Abstract: Daqing Oilfield is a continental oil-deposit of heterogeneous sandstone layer and many sheets of oil.In the middle and late period of development, oil sheet that can't be exploited before it should be done with advanced technology to ensure continuous, high and stable yields.A distinctive feature of oil sheet is that the interlayer enclosed partition is very short, so if perforation work results in the break of concrete circle, the quality of well cementation will be deeply affected and, the oil permeation among layers underground may affect the quality and quatity of oil directly, even the worse, a new well is forced to be abandoned. It is an extremely complicated problem that the perforation carried out in several hundred metres underground damages the concrete circle.From mechanical point of view, when the perforation bomb's efflux with great energy humps a complex composed of case, concrete circle and stratum at superspeed, stress will travel through medium in the form of waves.In order to study the damage mechanism of the concrete circle during perforation and carry out comprehensive experiments on preventing and tesisting connection, a kind of comprehensive experiment equipment used to simulate perforation and multi-functional equipment for testing the dynamic properties of the material are designed. Experimental study of the dynamical mechanical properties of original and some improved concrete rock and experiment used to simulate the well cementation and perforation are carried out in this paper.Standard for dynamical mechanical performance of the concrete rock with fine impact resistance and mechanical properties of some improved concrete rock are also given.

Key words: well cementation, oil sheet, resisting the oil permeation, concrete rock, dynamic behaviors, short rod specimen, fracture toughness

摘要： 大庆油田属非均质、多油层的陆相砂岩油藏,进入开发中后期时,为保证连续高产、稳定,必须依靠技术进步开发以前不能够采出的薄油层.薄油层的一个显着特点就是层间封隔段短,如果射孔作业造成水泥环破裂,会严重地影响固井质量,地下各层之间窜通,直接影响出油的质量和数量,甚至使新打的油井报废.在井下数百米深处进行的射孔作业,对水泥环的损伤是一个极其复杂的问题.从力学角度分析,射孔弹的聚能射流以超高速撞击由套管、水泥环、地层组成的复合体时,应力将以波的形式在介质里传播.为了探讨射孔时水泥环的损伤机理,系统地进行水泥环抗窜的综合试验研究,设计了模拟固井射孔的综合试验装置和多功能材料动态性能测试装置,对原浆水泥石和几种改性水泥石的动态力学性能进行了实验研究和模拟固井射孔试验,给出了具有较好抗冲击性能的水泥石的动态力学性能指标和部分改性水泥石的力学性能.

关键词: 固井, 薄油层, 抗窜, 水泥石, 动态性能, 短捧试件, 断裂韧性