Development Manner Of Horizontal Well-Vertical Wells Joint Disposing In Chang49-1Wellblock

on the basis of the information of the exploitation data at the early stage and the geology knowledge of the study area, this paper using the combined exploitation technology of horizontal-vertical Wells, designed the well pattern and the track of horizontal wells, thus achieved the goal of improving recovery efficiency and productivity. The main methods using in the process of research in This paper include:using the technology of stratigraphic division and small layers contrast in the purpose layer,reservoir and sand distribution rule,interlayer and insulation layer development situation in the purpose layer is fully understanded. using the electron microscope and microscope,the physical property of reservoir are analyzed. using the prediction of the sand body and geological characteristics of reservoir, the model of three-dimensional geological modeling is established. And combining with the analysis of the field production performance in the studied area, mainly including the evaluation analysis of reservoir natural energy, the analysis of reservoir productivity, evaluating the water absorbing capacity of reservoir and reservoir permeability capacity, the horizontal well-vertical Wells combined mining is determined in the exploitation of long49-1well block. Based on the principles of well pattern deployment, well pattern selected, lower limit of effective thickness of horizontal Wells and vertical Wells calculated, horizontal well track designed, finally the reasonable well spacing scheme and the range of water injection pressure and oil well flow pressure in the process of exploitation is gave.Through the research several main important conclusions are below:1.Fuyu oil layer in the study area is divided into Ful and Fu2and Fu3three oil groups.Ful oil groups as the major reservoir divided into up,middle and down three sandstone groups, seven small layer.Fu2oil groups divided into up and down two sandstone groups, five small layers.2.The single sand body major of the reservoir in the study area is thin and small, and the distribution scattered.Drilling rate of small layers of sandstone is low.3.The thickness between oil and water layer in study area is bigger.Interlayer thickness in the reservoir interior is thinner, interlayer is thicker.4. The study area belongs to the low permeability reservoir.5. Fracturing and advanced water injection exploitation is determined in the study area.6.Selecting optimizing well block to assign wells, making development plan, completed geological design of five horizontal well.