卫95块HSG-1油藏流体流向控制技术

HSG-1 reservoir fluid flow control technology in Wei 95 Block

赵长权 申立梅

中原油田分公司采油三厂，山东 莘县 252434

No.3 Oil Production Plant, Zhongyuan Oilfield Company, SINOPEC, Shenxian 252434, China

油田进入特高含水开发期以来，随着采出程度的增加和油藏水淹程度的加剧，平面上剩余油分布更加零散，措施挖潜的余地小，难度大，产量递减快。卫95块多轮次调剖后，Ⅰ类油层的增油潜力越来越小，Ⅱ、Ⅲ类油层受调剖污染，注水井吸水厚度逐渐减少，层间矛盾加剧，调剖措施效果逐年变差。调剖后注水压力上升，甚至注不进水，但吸水剖面改善不理想，启动新层的效果变差。因此，在卫95块开展以HSG-1油藏流体流向控制技术为主导技术的区块深部液流转向，试验5个井组，工艺成功率100%，区块自然递减降低5.6个百分点，PI值提高了2 MPa，井组累计增油量1 430 t，平均井组增油量286 t，自然递减得到了有效控制，区块开发形势好转。该技术可以改善区块水驱开发效果，减缓递减，保持持续稳产，并为下一步在该区块及类似特高含水油藏区块开展此项工作提供新的思路和方法。

Since the oilfield goes into the highest moisture period， with the increase of exploitation degree and sharp increase of oil reservoir flooding, residual oil distribution is more scattered horizontally. Room for measures of tapping potential is small and difficult. And yield decreasing is fast. After several rounds of profile adjustment in Wei 95 Block, potentiality of increasing oil gets smaller and smaller in class Ⅰ reservoir. Class Ⅱ and Ⅲ reservoirs have been polluted by profile adjustment. The absorbent  thickness of injection wells gradually decreases. Contradiction in layers is also aggravated. Effects of profile measures get worse year by year. Injecting pressure rises after profile adjustment, even water can not been injected. But suction profile is not ideal and the effect of starting new layers becomes worse. So in Wei 95 Block, block deep steering flow technology was developed, which takes HSG-1 reservoir fluid flow control as guiding technology. We test 5 well groups, and success probability of technology is 100 percent. Natural decline in this block cuts down 5.6 percent, and PI value has been up 2MPa. Accumulative increasing of oil production is to 1,430t, average increasing oil is to 286t per groups. Natural decline has been effectively controlled and exploitation situation gets better. The technology can improve water flooding development effect, slow down production decrease, keep stable yield and provide new ideas and methods for doing this kind of operations in this block and similar ultra-high water cut block.