Study On Water Injection Of Wangjiawan Region In Xingzichuan Oilfield

Waterflooding of wangjiawan oilfield exposes many problems in6years, mainly oil,water injection well pressure is more and more high, the difficulty increases gradually, whilethe overall reserves producing degree is low, control degree of water flooding in low, low oilproduction rate, the distribution of the residual oil is not clear, the thesis takes the developmentof geology as a starting point, analysis on reservoir geological characteristics of recognitionand water flooding performance as the means, a comprehensive evaluation of Wangjiawanoilfield waterflooding development effect, put forward the development measures ofadjustment, implementation and on-site guidance measures.According to the sedimentary cycle, lithologic association, stratigraphic contactrelationship and other factors, for the stratigraphic division and correlation, correlationframework established in the study region objective layer, basic data, the study area smalllayer research shows: Wang bay sand body at the top of the overall structure of the Northeasthigh, southwest low, stable tectonic. The study of Chang2oil-bearing formation is dominatedby fluvial deposits, long21-3development of sand body is good, the sand thickness distributionin the range of7~28m range, and in12~25m, the maximum value of30m. The Chang21-3reservoir sandstone dominated by fine sandstone (54.5%), the average porosity is15.7%,average permeability is13.1×10-3μm2.Aiming at the present situation of the study area of water flooding, water floodingadjustment scheme was studied, using rhombus inverted nine spot well network,350m rationalwell spacing, row spacing of150-200m planning and construction of reasonable waterinjection station3, the new capacity of water injection900m3, engineering mainly includes theinjection hole, radiation and water collecting Gallery; injection process to go it alone, a smalltube regional activities, water injection technology; water injection water for oilfield producedwater and formation water, formation water from seepage wells, injection water quality inaccordance with the "2011to extend the oilfield water injection water quality standards (forTrial Implementation)" class II implementation, well reasonable water injection intensity of4.27m3/m.d~12.58m3/m.d, the average8.43m3/m.d；...