Study On The Infilling For Chao 948 Block In Chaoyanggou Oilfield

Well pattern thickening is one of the most important measures in the process of oil field development and adjustment. The recovery of water flooding is very low in water flooding development of low-permeability oil field. However, by using well pattern thickening, the development performance can be significantly improved. With the continuous increase of the water capacity in the oil field, how to determine a reasonable injection-production ratio of the block with multi-well network at the last stage of high water-cut has an important meaning to guide the development of water-drive adjustment and to control ineffective cycle of water injection.Type II block in Chaoyanggou oilfield has low permeability and crude oil has high viscosity and poor mobility. With the production time increasing, injection-production pattern generates the pressure, and it has a low production rate. the fundamental reasons of the worse exploitation is a poor reservoir properties in the area. At 300m spacing, it is difficult to build efficient driving systems between injection well and production well. Aiming at the geology and dynamic characteristics of the chao 948 block, This paper established a three-dimensional geological model of 37 goal layer. History matching precision of oil reservoir numerical simulation meets the requirements of remaining oil distribution and project forecast. Based on the study of remaining oil distribution, this paper studied the relationships among reasonable well spaces, well patterns and permeability. The calculation result shows that with permeability of less than 5×10-3μm2 in chao 948 blocks, the proposed well spacing is equal or lesser than 180m, the proper ratio of well spacing to well array is about 1.5.With the injection-production ratio increases after well pattern thickening, the integrated development results from good to deteriorate. A reasonable extent injection-production ratio is 2 ~ 3. It can build an effective driving pressure system after well pattern thickening, and can effectively improve the production of development reserves. .This method is very significant for the further adjustment and scientific development of the field.