Research On The Parameters Technique Of Layer-Recombination And Well Pattern-Adjustment For The Reservoirs With Ultra-High Water Cut Stage In SN Development Zone

With the continuation of production time, most of the current reservoir has enteredextra high water cut period, compared with the early development of oil production, theoilfield production is greatly reduced and decreasing speed, indicating that the reservoirdevelopment early combinations of layers and well network deployment is not suitable inhigh water-cut stage of development. According to the characteristics of the development ofextra high water cut period, we must be re-dividing layer series and well pattern adjustment,significantly reduce the interference between the layers，make full use of reservoir potential，in order to ensure sustained and stable yield.In this article， Sa north development zone is the main object of our studying. Studyingthe variation tendency of the moisture content、the water cut increasing rate、a the netinjection percent and the rec overy percent of reserves in the blocks of Sa north developmentzone is the main thing. Then through evaluating the development effect in each block，coming to a result that development effect of the two blocks of north east and east is poorer，the other four blocks is better. Secondly， based on the theory of petroleum development，Using the multiple correlation analysis principle， select the larger ndex of effect ofdevelopment series of strata combination and index of well pattern adjustment，respectivelyformation evaluation index system and pattern evaluation index system is established. Amongthem， formation permeability evaluation index system mainly includes permeability ratio，combination of thickness， water flooding degree， Interlayer distribution densityand scale，etc; pattern evaluation index system mainly includes well spacing density， injector producerdistance， oil and water Wells ratio， oil drilling in rate， water flooding control degree.etc.Finally， using the established evaluation index system of well pattern evaluat the six blocksof Sa north development zone. Then determining the main factors affecting the developmenteffect of all blocks.In order to fully excavate remaining oil potential and extended well pattern adjustmentform and connotation， using the method of combing profit and loss balance economicevaluation methods and Reservoir engineering analysis to study the parameters technique oflayer-recombination and well pattern-adjustment for the reservoirs with ultra-high water cutstage. When the reservoir permeability is less than100×10-3μm2，producer-injector spacing should be controlled within150m; when the reservoir permeability is more than100×10-3μm2，producer-injector spacing should be controlled within200～250m.During theperiod of reorganization of formation， The smaller each pattern permeability differential ofpure oil region，development effect is better， When the crude oil price is3161yuan ($65/barrel)， economic limit well pattern density of the best kind of reservoir is40口/km2；economic limit well pattern density of Class II Reservoirs is74口/km2；economic limit wellpattern density of tertiary-main layers is50口/km2.