Study On Fine Description And Redevelopment Deployment For The Dalinghe Reservoir In Huan17Block

This study has been carried out on the basis of field tests of water coning control. A3Dgeological model is built through comprehensive using of reservoir engineering analysis,numerical and physical simulation to study the flow and fluid mechanism and water coningtrend in massive reservoirs of turbidite facies with edge/bottom water. The effects ofgeological and engineering factors on reservoir development response are understood. Therational timing of water coning control is preliminarily determined, the distribution ofremaining oil is generalized, the sites with reservoir potential are pointed out, and theadjustment program is made and the result is forecasted, thus provided basis forredevelopment in this block.This research analyzes the impact of interlayer on vertical oil/gas/water migration, andcorrects the static geologic research result of fine description of the Dalinghe reservoir inHuan17block with actual production performance. The distribution of interlayers in Huan17block is discontinuous and irregular; the interlayers have certain influence on verticalpermeability, which is1/4of the horizontal permeability. Numerical simulation shows that theratio of vertical to horizontal permeability, and oil-water viscosity ratio are in directproportion to the advancing rate of water coning, so are they to water coning declining rateduring water coning control process. Only interlayer distribution is in inverse proportion tothe advancing and declining rate of water coning. Water coning declined rapidly then gently,and rapid decline appeared in the first four years of water coning control. Water coningdeclines rapidly under conditions of limited supply boundary and low water cut. For an actualreservoir, water coning control should be conduced through shut in when water cut is below80%and the optimal control time is3years. When water cut is over80%, the recommendedwater coning control time is4years. The study of water coning effect in reservoirs withbottom water indicates that the greater the liquid production per unit thickness is, the sharperand higher the shape of water coning is, and the more notable the effect of water coningcontrol will be, i.e. both the height of water cone and water cut will decrease quickly, and viceversa. The control measures for water coning are effective for flooded-out wells in placeswhere residual oil is abundant. Under shut-in condition, the height of water coning can bereduced by6-8m within4years. The study shows that, among the36developmentadjustment schemes, water coning control and horizontal well can achieve very gooddevelopment result.