裂缝性储层屏蔽暂堵分形理论的研究
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摘要
文章针对现有屏蔽暂堵理论尚处于经验选择暂堵剂、定量化程度不够的情况 ,引入分形理论 ,对裂缝性储层屏蔽暂堵技术进行了定量化的研究。研究认为 ,裂缝性储层张开度分布具有分形特征 ,可以用裂缝张开度分布的分维数定量表征裂缝张开度分布的复杂程度 ;同样暂堵剂粒径尺寸分布的分维数可定量表示暂堵剂粒径尺寸分布的复杂程度 ,所以可以两者分维数相近作为优选暂堵剂的原则 ,从而建立起了裂缝性储层屏蔽暂堵分形理论。取自新疆油田中拐隆起北东斜坡区克 84井现场岩心和新疆油田常用的几种暂堵剂 ,进行了分维数的测定和计算 ,并利用此理论进行了暂堵剂优选和室内暂堵试验 ,取得了较好的效果 ,初步验证了理论的正确性。
Because the choice of temporary plugging agent (TPA) according to existing shielding temporary plugging theory is mainly dependent upon one's experience with a low quantification degree,a research on the quantification of the shielding temporary plugging technology of fractured reservoirs was carried out through introducing fractal theory.By means of the research results it is considered that the fracture opening distribution in fractured reservoirs is of fractal property and the complexity of the distribution may be quantitatively characterized by its fractal dimension;and,in the same way,the complexity of the distribution of the sizes of the grains in TPA may be also quantitatively indicated by its fractal dimension.Therefore the approach of the fractal dimention to each other may be taken as the principle of optimizing TPA,thus having established the shielding temporary plugging fractal theory of fractured reservoirs.The measurement and calculation of the fractal dimension were carried out for the cores collected from well Ke-84 at the northeast slope of Zhongguai uplift in Xinjiang Oil Field and for several TPAs commonly applied to the region.Through the optimization and laboratorial testing of TPAs by use of the theory,it is shown that a good result has been achieved and the correctness of the theory has been initially examined.
Because the choice of temporary plugging agent (TPA) according to existing shielding temporary plugging theory is mainly dependent upon one's experience with a low quantification degree,a research on the quantification of the shielding temporary plugging technology of fractured reservoirs was carried out through introducing fractal theory.By means of the research results it is considered that the fracture opening distribution in fractured reservoirs is of fractal property and the complexity of the distribution may be quantitatively characterized by its fractal dimension;and,in the same way,the complexity of the distribution of the sizes of the grains in TPA may be also quantitatively indicated by its fractal dimension.Therefore the approach of the fractal dimention to each other may be taken as the principle of optimizing TPA,thus having established the shielding temporary plugging fractal theory of fractured reservoirs.The measurement and calculation of the fractal dimension were carried out for the cores collected from well Ke-84 at the northeast slope of Zhongguai uplift in Xinjiang Oil Field and for several TPAs commonly applied to the region.Through the optimization and laboratorial testing of TPAs by use of the theory,it is shown that a good result has been achieved and the correctness of the theory has been initially examined.
引文
1 崔迎春.分形几何理论在屏蔽暂堵剂优选中的应用.石油大学学报,2000;24(2):17～20
2 T .D .高尔夫拉特.裂缝油藏工程基础.北京:石油工业出版社,1989
3 高安秀树著,沈步明、常子文译.分数维.北京:地震出版社,1985
2 T .D .高尔夫拉特.裂缝油藏工程基础.北京:石油工业出版社,1989
3 高安秀树著,沈步明、常子文译.分数维.北京:地震出版社,1985
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