| Reserves of low permeability reservoirs in China are huge, due to poor reservoir physical property and short production period in low permeability reservoir, the ratio is low. So it is very important to study the technology of low permeability oil field exploitation.The average permeability of Wu 5 well area in Baikouquan formation is 5.58 mD, belongs to low permeability reservoir. Compared to other low permeability reservoirs.It is not only faced with many of the same problems in the development process, but also some new problems. On the basis of previous studies, study on percolation mechanism of low permeability reservoir and development technology optimization. Based on the analysis of Baikouquan reservoir geological characteristics and the dynamic characteristics, the paper mainly completed the following research work and made the corresponding results:1) Using the geological data in Wu 5 Baikouquan reservoir to descripte reservoir. The Baikouquan formation reservoir of Wu 5 well area is the edge of unsaturated water nose with low permeability and low oil oil-water transition sand conglomerate reservoir.2) The low permeability reservoir exists the starting pressure gradient, using different calculation methods to calculate the starting pressure gradient of the study area, the result is used to study the starting pressure gradient of the well, the use of the reservoir, the calculation of the reasonable well density, etc. then analysis the influence factors of low permeability reservoir.3) In view of the problems of low productivity, high water cut and low pressure in the study area, evaluating the effective capacity and analysising the influencing factors. The main factors that affect productivity are reservoir type, fluid distribution, perforation location and so on. In particular, the distribution of oil-water transition zone is the essence of the productivity difference between the east, middle and west area.4) Low permeability reservoir has problems like low productivity, low injection production, low pressure level.So the development mode is studied, and the numerical simulation is used to study the effect of different development methods. Compared with the several development of natural energy development, lagging water injection, synchronous water injection, advanced water injection and cycle water injection, the advance water injection development mode is more suitable for low permeability reservoir.5) At present, the oil field development has adopted the rule of the anti seven point well pattern water injection development well network, but the development effect is poor. In the late stage, the development effect can not be improved by the injection production structure adjustment. So the reservoir is carried out the research on the reasonable exploitation of the technical policy limit, demonstrated the reasonable production pressure difference, reasonable injection rate, reasonable production rate of oil recovery, reasonable injection production ratio, reasonable pressure to maintain the degree and other parameters, and optimize the development mode of the study area. |
