| Liaohe Oilfield Shuyi area is located in the middle section of the western slope in the western depression of Liaohe basin, the development target zone is Xinglongtai reservoir, Shahejie group, Paleogene, Cenozoic. The target zone is heavy oil reservoir which includes four pay zones and deploys the development method of cyclic steam stimulation. Later period, confronting the problem of higher cycle, decline of production, single well operation cost, and in order to enhance oil recovery factor, Du 84 block XingI group reservoir carried out development mode conversion, using SAGD development method,31 horizontal SAGD well pairs planned. The production performance of the Xingping 264-291 well group wasn't good and can't achieve the plan production index because of the impact of interbedded shale layer. In order to solve the key problem that is the effect on the development due to the interbedded shale layer. The author used some new technologies such as the advanced theory of sequence stratigraphy simulation and fine reservoir description and reservoir numerical simulation including:fine stratigraphic correlation technology, micro structural research technology, secondary logging interpretation technology, three-dimensional modeling technology, numerical simulation and remaining oil distribution technology research. First, by using the theory of sequence stratigraphy, comparing the stratigraphic section; according to rhythm characteristic and lithology, electrical property, we will divide XingI Group stratum into 4 layers of Xing I1, I2,I3, I4, and complete the comparison and study of the single sand body. Based on stratigraphic correlation results, ensure the regional tectonic characteristics of the research area. Based on the analysis of the four-property relationship in the study area, completed more than 300 wells logging interpretation work, established the shale content, porosity, permeability, saturation model; twice interpretation of the effective thickness of the single sand body; Based on the reservoir description, combined with the dynamic data of production, determined the reservoir parameters. Based on the fine characterization of structure, lithology and reservoir sand bodies, application conditions simulation, established the Du84 block in XingI group of gravel bearing sandstone reservoirs of fine 3D geological model, last comparison of muddy intercalation model and development effect of no interlayer model, the existence of the mudstone interlayer had a significant effect on the development of the steam chamber, and then affect the development effect. Shuyi area XingI group reservoir is an important target area in the western depression of oil and gas production, development of SAGD depth. Oil workers recognize, the effect of the development of the spacer layer on the development of SAGD has important effect on the development. So, This paper based on the commitment of the interbedded shale layer, the effect of the interbedded layer on the SAGD development, proposed improvement solutions, improved the production performance of the well groups and maintained well groups successfully transferred to SAGD, provided beneficial guarantee for oil field stability.Above all, in order to solve the problem of the production performance effect of the interbedded shale layer, the author combined the traditional geological method and advanced numerical simulation method, predicted the distribution of the interbedded shale layers between wells, found the reasons for the development performance effect, and solved the problems successfully. |
PDF Full Text Request