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

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