Operating experience with a horizontal wells in various geological and physical conditions (for example perm edge fields)
Currently, more than 220 producing horizontal wells are being exploited in the fields of LUKOIL-PERM LLC. The main drilling of horizontal wells (81 %) falls on the carbonate type of reservoir, while in recent years the volumes of drilling in the terrigenous reservoir have increased. The main volume of horizontal wells drilled in the carbonate type of reservoir falls on the Tournaisian formations (67 %) and only 25 % in the Bsh and ВД formations. The analysis of drilling of horizontal wells and their further exploitation shows that they often do not justify their purpose, the flow rate grows insignificantly compared to the calculated one, often there is a rapid irrigation of the produced products, the share of working intervals decreases, and so on. It has been established that the experience of drilling horizontal wells in the Perm Territory in monolithic or weakly dissected formations with high values of oil-saturated thickness shows a high success rate of applying this technology; for all horizontal wells drilled in reservoirs with high dissection, small effective oil thickness, large difference between the total and effective oil saturated thickness of the reservoir, there is a dynamics of decline in productivity to average values of flow rates of directional wells. It was revealed that drilling wells with horizontal penetration to the upper development objects (Bsh and ВД) is ineffective for the fields of the Perm Territory, the most cost-effective method is to drill small diameter wells with a directional end.