Ansai Oilfield Shallow Oil Layer Development Test

Since the eleventh five-year plan, Ansai oilfield has been facing high degree on exploration, high quality proved reserves insufficiency, the development situation of little space. Large area of its shallow reservoir, large quantity of production oil well, the next step is important to replace reserves and development the breaking point. Meanwhile, oil has buried shallow, the single well productivity is low, petrophysical property characteristics of the poor, and carry out matching development technology policy research, to realize the economic development is the next step of the effective focus.This article in view of the problems existed in the development of oil fields and contradiction,19, from the bridge, such as the110Dan5shallow and its development and reservoir characteristics, shallow reservoir reasonable development research technology policy and supporting technology, stable and effective development of oilfield has the important practical significance, but also for the development of similar reservoirs later reference and guidance, to further explore shallow reservoir development modeThrough the study, obtain the following research results:1. Shallow reasonable development technology policy:Dan110and5reasonable along the row spacing in120-160m between; Dan110, along with the five diamond at9o’clock water injection well nets advance, advance single well accumulated water flooding reach1200m3development effect is best, Dan110,, and the reasonable injection along the5in10-13m3, bridge and reasonable injection for18m3or so, reasonable injection quantity and recovery ratio1.1-1.2for best; Bridge19area, Dan110area, along the five districts, reasonable well spacing density of21.4,16.4and16.5mouth/km2, limit well spacing density were38.5,27.0,29.3mouth/km2; Calculation by the three blocks diamond nine well spacing form the row spacing for130-180meters, the spacing is for450-480meters; The square the reasonable well spacing at9o’clock well network for225-265meters between.2. the horizontal well wellnets form optimization:draw five well nets type, in order to give priority to five well network (including spacing, the row spacing, article cracks number); Demonstrates the water injection effect and sensitive parameters of horizontal analysis, level production Wells dry up energy, can become injection Wells; Natural tiny cracks EW90°direction, artificial fracture trend for NE60°or so; Well network with the main fracture well drainage direction parallel effect; Horizontal section as far as possible to avoid lanes, avoid the and oblique, horizontal section and crack line intersection direction development effect is poorer, perforating process to avoid both extension direction on the perforation3. reservoir transformation:reforming the large scale, although initial high output, but bad for long-term and stable.4. energy supplement:Dan reservoir area is located in the110side, reservoir physical property is poorer, average period of650m, average perforating nine points, formation energy release quickly, as soon as possible water injection supplement energy; Bottom water reservoir can through the horizontal well development, increase the single well yield, improve the development effect, and bottom water reservoir horizontal well can be natural energy development.