The Research In The Feasibility Of Well Re-infill In Cha He Ji Oilfield

Cha Heji Oil Field belongs to one of the two major types of sandstone oil fields in HuaBei oil field. Many measures have been taken on the center of how to stabilize the production during the past 20 years of development. However, with the deepening of the oil field's developing, the oil field has entered the middle-late development stage. The distribution of the remaining oil has become scattered and complex and difficult to find its rule. The oil field status indicates that the water cut is quickening up, the yields decline is speeding up and the production responses of ordinary measures weakens obviously. How to tap the remaining potential has become a puzzling problem. In order to turn this situation, fixed thinking mode must be broken through to try new ways to tap the remaining potential. Fated by the fluvial deposition of Cha Heji oil field, although the well infill has been finished, the degree of reservoir communication and the degree of water flooding are lower. Thus, in order to seek the ways to stabilize the yields and to lower the natural decline, we did an experiment of well re-infill in the area of well Chal5-141, then, we analyzed the feasibility of well re-infill in some other areas of the oilfield and pointed the potential blocks .If the experiment could bring some breaking through, it would be a new field for the building of oilfield potential and of important significance.We study the feasibility of well re-infilling in Chal5-141 wells subarea. Main contents consist of reserve checking character analyzing on pay zones Water flooding status quo analyzing about main sand bodies Controlling degree of well pattern to the sand bodies well space's influence on oil layer's connected status-. Influence of the wells spacing to water driving status A study about reasonable well space of the reservoir etc, and give a feasibility project of wells spacing.After the project's actualizing, we evaluate the effects. Main contents consist of character of oil layers varying vary character of oil sandstone bodies water driving ratio and water submerging status of oil layers analyzing character of oil reserves analyzing residual potential analyzing, exploiting characters evaluating, forecasting of finally recovery ratio economicbenefit evaluating and so on. The results index that the effect of second well space decreasing is preferable giving potential areas to continue carry out well re-infilling in Cha Heji oil field .