The Bottom Water Reservoir Fracturing Water Control Mechanism And Optimization Of Process Parameters

WQ exploration area belongs to the Jurassic yanan group reservoir, reservoir are scatteredin the plane distribution.sand body lateral connectivity is poor, the cyclic sedimentation isnormal on the longitudinal, active bottom water, the conventional hydraulic fracturing is easyto appear the phenomenon of high water cut, oil well first-timer, high water cut rising fast,poor development effect, low recovery efficiency. Therefore optimizing the water controlfracturing mechanism and the process parameters of the bottom water reservoir in the studyarea have great sense to improve the single well reservoir production.through analysis of the geological characteristics of Y9and Y10reservoir of WQexploration area, thinking that belong to the thin reservoir, low permeability layer and layerbetween the stronger heterogeneity, reservoir porosity delay of Y9is11~16%, the averagepermeability1.52×10-3μm2, Y10reservoir porosity between12~18%, the average permeabilityis1.56×10-3μm2. Affecting the research of crack extension uncontrollable factors andcontrollable factors that store interlayer differential stress and displacement of construction isthe main influence factors of high seam control, uncontrollable factors including formationprincipal stress, young’s modulus and poisson’s ratio of reservoir physical properties,controllable factors including perforation parameters, sinking agent added amount,construction capacity, preflush, sand content, construction parameters. After the research ofreservoir water control fracturing mechanism and the study of early after fracturing parameters,the perforated degree is50~60%, and construction of the reservoir displacement is0.8~1m3/min, and they are not rationality, has further optimized fracturing effect of space. According tothe above research results and optimization of the reservoir fracturing parameters, think theperforation position should be located at the top of the reservoir or in the upper, which issuitable for16holes/m, since this small displacement is0.5~0.8m3/min, small amount of sandis1~5m3, small sand ratio is15to25%and preflush accounted is for20~30%. Theconstruction process of the above optimized parameters for the field application, shows thatmeasures effect is remarkable, the moisture content was reduced by7%, increase times ratio up to10.1, increase yield significantly.