Remaining oil potential and adjustment countermeasures in fault X well area of Lamadian Oilfield

Abstract

The distribution characteristics of remaining oil in fault well area X of Lamadian oilfield are studied by numerical simulation, and adjustment countermeasures are formulated. Through the establishment of numerical model, the geological reserves and residual reserves of each small layer are analyzed, and the oil saturation distribution diagram output by the model is calculated, and the distribution characteristics of different types of remaining oil are summarized. The results are as follows :(1) the residual reserves are mainly distributed in the channel, accounting for 57.0 % of the total residual reserves, followed by the main sheet sand; (2) The remaining oil is mainly affected by imperfect injection-production relationship, fault occlusion and plane interference, accounting for 95 % of the total reserves of the type. Imperfect injection-production relationship accounted for 73.58 % of remaining oil types. The second is the enrichment of remaining oil from plane disturbance, accounting for 12.3 %. Residual oil of fault occlusion accounted for 9.16 %. The optimal well spacing was 200m, and the final recovery was 2.84 % higher than the original well pattern.