浅薄互层普通稠油油藏水力压裂的实践与认识

W5、W8普通稠油油藏珍有埋藏深度浅，多层状砂泥薄互层，中孔，中低渗型储层且隔夹层薄的地质特点,地层原油流度低，未经过储层改造的单井自然产量低，针对这种情况，近几年来，通过在储层物性，含油性及井筒技术状况等方面进行压裂选进条件的优化，开展了注水稠油油藏的水力压裂引效探索性试验，应用高砂比的高导流能力短缝技术，小排量小规模控制缝高技术，防止水基压裂液与稠油乳化措施及防止压裂后目的层底部地层水上窜技术等配套水力压裂工艺，增产效果较为明显，油田开发效果得到改善，通过稠油油藏水力压裂的实践认为，压裂选井的有利方向主要位于储层物性及含油性较好的构造高部位，压裂工艺的关键是合理控制压裂规模。

Practice and understanding of hydraulic fracturing in shallow, thin, interbedded, common heavy oil reservoirs

W5 and W8 common heavy oil reservoirs were shallow buried, multilayered thin interbeds of sandstone and mudstone, medium pore and mid low permeable reservoirs. The in situ oil mobility is low, and natural production from wells located in unreconstructed reservoirs is low. In view of this situation, in recent years, fracturing wells are screened as per reservoir petrophysical properties, oil bearing and wellbore techniques. Hydraulic fracturing pilot test for water flooding heavy oil reservoirs has been conducted by using techniques of short distance fracturing at high sand rate and flow conductivity, fracture height controlling within small discharge capacity and scale, and preventing emulsifying of water base fracturing fluid with heavy oil, preventing bottom water channeling upward after fracturing. Oil increment brought by these techniques is notable, and oilfield development effectiveness is improved. Hydraulic fracturing in these heavy oil reservoirs shows that favorable location of fracturing wells is structural high where petrophysical and oil bearing properties are good, and the key of fracturing technique is to control the scale of fracturing.