大庆长垣特高含水期表外储层独立开发方法

doi:10.11743/ogg20170119

Abstract

Abstract:

Low permeability thin oil layers have become the main object for waterflooding production in extreme high water cut stage in Changyuan area,Daqing oil field.However,conventional methods,such as well pattern infilling and layer-specific water injection,could get no satisfying effect.Therefore,a method of independent development of low permeability thin oil layers is put forward by taking into account features of these low permeability thin oil layers and technologies of layered hydraulic fracturing.Two kinds of development models are suggested,and one of the models designs how water wells perforate reservoir zones depending on the number and pattern of oil wells that perforate low permeability thin oil layers only,the other one designs how oil wells perforate zones depending upon the number and patterns of water wells that perforate low permeability thin oil layers only.Then,the recovery of these two modes are compared by waterflooding physical simulation experiments with multi-layer artificial casting cores.The productivity model of layered fractured vertical well is deduced considering the threshold pressure gradient and horizontal fractures in shallow reservoirs,and the technology limits are calculated and analyzed for the independent development of low permeability thin oil layers.The results show that the first model will get more recovery than the second one,and the technical limit of spacing is about 228 m,the economic limit of thickness is 2 m.With the increasing of low permeability thin oil layers thickness to total perforated thickness ratio,recovery declines firstly and then remained stable,and rises rapidly finally.Field application shows that the average well production is 3.7 tons/day under the independent development of low permeability thin oil layers,its development effect is better than tertiary well pattern infilling.

Key words: waterflooding vertical sweep efficiency, horizontal fracture, separate-layer hydraulic fracture, extreme high water cut, low permeability thin layer, waterflooding production, Changyuan Structure in Daqing oilfield

CLC Number:

TE348

Gao Dapeng, Ye Jigen, Li Qi, Shi Chengfang, Hu Yunpeng, Hou Shaoji, Ji Shuhong, Huang Lei. An independent development method of low permeability oil thin layers with extreme high water cut in Changyuan Structure, Daqing oilfield[J]. Oil & Gas Geology, 2017, 38(1): 181-188.

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An independent development method of low permeability oil thin layers with extreme high water cut in Changyuan Structure, Daqing oilfield

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