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Considered influences of reservoir characteristics and perforation parameters on the perforation efficiency,new perforation techniques including over balance pressure perforation,1m bullet perforation and over sleeve perforation etc.

结合储层性质及射孔参数对射孔效率影响和理论研究 ,通过引进超正压射孔、1m弹射孔、袖套式射孔等新型射孔技术 ,针对不同类型油藏优化射孔参数 ,射孔完善程度得到提高 ,取得了明显经济效

The definition of the positive hyperstable matrix was given,and the relations among classes of positive definite matrix,metapositive definite matrix, well generalized positive definite matrix,generalized positive definite matrix,positive hyperstable matrix and positive stable matrix were studied.

提出了超正稳定的概念，讨论了实对称正定、亚正定、良广义正定、广义正定、超正稳定及正稳定矩阵类之间的关系，得到了若干确定的结果。

In this paper, we mainly give the following conclusion: Let X be a Banach space with the boundedly complete and hyperorthoronal basis {x_n}, then P_XX_n has Radon-Nikodym property if and only if X_n(n=1,2,…) has Radon-Nikodym property, thus generalize the corresponding result in refence [1].

主要给出了如下结论:设X是具有有界完备超正交基的Banach空间,则置换空间PXXn具有Radon-Nikodym性质当且仅当Xn(n=1,2,…)具有Radon-Nikodym性质,从而推广了文献[1]的结果。

The relationship between the numbers of the geometry elements in N-D hypercube;

n维超正方体中几何元素的数量关系