Research On The Development Technology Of Fang 4 Block Of FangZheng Oilfield

Fang 4 block of FangZheng oilfield was located in TongHe of HeiLongJiang province. The formation of the reservoir is mainly controlled by tectonic condition, with a certain structure amplitude. At the same time early or inherited faults have certain lateral sealing of oil and gas. In the reservoir, oil was above the water and the oil-water interface with unified. This reservoir was also a typical fault block reservoir which was controlled by structure.Geological study found, the tectonic pattern of Fangzheng fault was two concave and one convex with two slope, which can be devided into 5 second tectonic unitsthe which were south slope belt, eastern sag belt, west depression belt, northern uplift and the west slope belt. There were gravelly sandstone, fine sandstone, dark mudstone and coal in the reservoir. The study of Layer rhythmicity, core data analysis, porosity, permeability, profile distribution of sandbody geometry and continuity, porosity, permeability distribution showed that there was reservoir heterogeneity in longitudinal and transverse direction. From the ground crude oil nature, we can see that, oil was light, with low density, low viscosity, low solidifying point, medium wax containing. We can also make the conclution that it was the volatile oil reservoir.According to the characteristics of Fang 4 block which was especially low permeability, low pressure conductive ability, we decided to use artificial complement formation energy to develop the reservoir. Combining Changchun oilfield and other similar oilfields production experience, we made feasibility evaluation on the gas injection and waterflooding mode separately, to decided which mode fits our block. And we optimized the development plan, well network design, selection of well deployment work system, also the prediction on the development index and economic evaluation of development scheme were made.