王庄油田防膨实验与防膨机理研究

王庄油田是国内外罕见的强水敏性稠油油藏。粘土膨胀危害严重地制约着开发效果。为了防止粘土膨胀,选用了KOH、NH2CONH2、FGW-2这3种类型的防膨剂,在室内开展了静态配伍性实验和岩心流动防膨实验,均见到了良好的防膨效果。其中,以NH2CONH2(尿素)效果最好,它可把水相渗透率提高144%,主要机理是尿素能把膨胀性粘土转变为其他非膨胀性矿物,其转变效果可与美国专利4,227,575报道相类比。笔者应用这些实验资料对防膨效果与机理予以探讨。

Study of Expansion-Prevention Test and Mechanism in The Wangzhuang Oilfield

The Wangzhuang oilfield is a rare heavy oil reservoir of strong water sensitivity at home and abroad. Expansion of clay mineral seriously harms the exploitation. In order to prevent the problem,three expansion-preventatives of KOH,NH2CONH2 and FGW-2 have been chosen in the indoor experiment which includes static compatibility and core mobility experiments. These experiments have achieved excellent effects. But NH2CONH2 (urine) is the best in the three preventatives because it can increase permeability of water phase by 144%.The basic mechanism for that is that NH2CONH2 can transform expansion clay minerals into other mineral of non-expansion. The effect can be comparable with the U. S patent 4,227, 575 report. This study is to use the experiment data and to explore expansion-prevention effect and mechanism.