The Research Of Super Heavy Oil Development Technology Of Du 813 Block In Liaohe Basin

Liaohe oilfield has been probing geologic reserve of 1.05 billion tons heavy oil, can use 740 million tons heavy oil reserves, heavy oil production has accounted for over 65% of the liaohe basin total production. Du 813 block is located in the west slope in the western depression of liaohe basin. IN 2003, this block has began to develop.The development purpose layer is Xing Longtai oil reservoir, and the oilfield square is 2.18 km2, oil geological reserve is 1224 x 104 t, is glad ridge production plant is the only heavy oil block and, oil bearing area of 2.18 km2, reported oil geological reserves 1.224 million ton. It is the only heavy oil block of Huan Xiling plant. At present, the rate of oil production in Du813 block is 0.79% and recovery degree is 6.75%. In order to develop stably and continuously of Du813 block. Based on the characteristics of Du13 block reservoir and combined with its development history and the existing problems, seeking the suitable way for this block development.The development of heavy oil blocks comtaines steam stimulation, steam flooding, nitrogen foam flooding, CO2 stimulation technology and the other development way. Because of steam flooding and nitrogen foam flooding technology has larger limitation the choice of oil Wells. Ther demand of CO2 stimulation technology is higher, reservoir physical property is not suitable for general heavy oil reservoir development. Steam stimulation is a way of mining, using Periodically to dryness for 75% of the steam injected into formation, then For oil heating, to reduce its viscosity, improve crude oil mobility. So for ultra-heavy oil reservoir and unsuitable for steam flooding of heavy oil reservoir, steam stimulation is an effective way of mining.Du 813 block by steam stimulation stimulation development, At present, there are mainly in low formation pressure, crude oil viscosity, well drainage period, oil well steam injection interference phenomenon gradually increased, the phenomenon of serious sand production, oil steam balance, downhole conditions, cause of producing water in oil well of complex problems. According to development potential of heavy oil reservoir in Du813 block and combining with the reservoir conditions and the block material basis,drilling and completion well engineering、injection-production process technology、technology analysis of ground engineering,studing the daptability and feasibility of steam stimulation. On the basis of success of experiment, Experienced the development stage, rolling development stage, the stage of technical research. Take the horizontal well encryption, combined steam stimulation measures such as improving the degree of reserves.