Research On Geological Characteristics In Development And Improvement Of Water Flooding Development In Block 126 Of Jilin Oilfield

The injection-production contradictions in the plane of Mu 126 block of Jilin Oilfield is prominent.And there is a big discrepancy of section using.It is difficult to use the remaining reserves effectively with the existing well pattern and the state of the using layers.With the rapid increase of water content and the deterioration of the well condition,the reservoir’s final water drive recovery rate is difficult to reach the calibration value.The recovery degree of the area was only 18.3%.Compared with the calibration recovery,there are still eight percentage points of storage space.Considering the problem of the contradictions of flat injection in the block,the serious unbalance of the section,the substantial remaining reserves,through the study of the small layer sedimentary microfacies and single sand body characterization of infill well pattern on the basis of previous research achievements of reservoir,we reconstruct the underground knowledge system to deepen the understanding of the type,distribution and contact method of the main reservoir in the high water-cut development stage.And based on the analysis of the perforation layer,we establish a good injection-production relationship between the injection-production wells in thick sandstone and sand body development zone.Based on the production dynamics and monitoring data,we analyze the block development indicators and their control factors,and quantify the residual oil distribution.For the development area of the preexisting fault,relying on the favorable conditions of encrypting well network,the well-tie sections of crossing fault has been established to further implement the breakpoints and the displacement of fault.According to the production history of oil and water wells,we analyze the relationship among the distribution of oil and water,structural location and well production rate in Fuyu reservoir,optimize the reconstituted well network pattern and formulate the technical countermeasures.In view of the condition of the strata and plane non-corresponding injection,the technical countermeasures are plugging,recoverying and renewing wells.We evaluate the potentiality of the oil pool,improve the waterflooding effectiveness,the technical countermeasure is formulating the injection and production countermeasures,including closing and plugging the wells,stopping,limiting and increasing the injection.We carefully explore the potentiality of remaining oil in planes,inter layers and interior layers.It has practical significance for radically improving the condition of reservoir waterflooding and achieving a stable and rising block production.