Study on Class 3 reservoirs infill adjustment methods

Oil Production Plant, Petrochina Daqing Oilfield Company, Daqing, Heilongjiang 163001, China

Abstract

The exploitation object of the Class 3 reservoirs of infill adjustment well pattern is SaPu thin and poor oil reservoir and Gaotaizi oil reservoir. The remaining oil potential of thin and poor oil reservoir and untabulated reservoir is brought into full play to the maximum extent, which is the focus of this infill adjustment. Therefore, it is necessary to carry out effective research on the formulation of mining plan, the dynamic change law of new and old wells from plane connection to vertical sedimentary units, and the tracking and adjustment of surrounding wells. First, according to the change law of sand body control degree in different oil layers and different well spacing, combined with the remaining oil distribution characteristics of Class 3 reservoirs of Sapugao oil layers, the well pattern and well spacing are optimized. The second is to study the complex well pattern, well location relationship and its matching adjustment timing. Through the structural adjustment of the infill well pattern of the Class 3 reservoirs in plane and vertical combination, A set of adjustment and tapping technology of the infill well area of the Class 3 reservoirs is formed, which gives full play to the remaining oil potential. Compared with the expected single well daily oil production of the typical region increases by 1.2t, water cut decreases by 2.8 percentage points, and the natural decline is - 10.22%. The research results of this innovative well pattern infill combination method and potential tapping method of matching adjustment have certain reference significance for guiding the adjustment and potential tapping of infill well area of Class 3 reservoirs in water drive.