Methodof Controlling Factors For Horizontal Well Water Flooding Of Sandstone Thin Interbedding

Hadexun Oilfield has been found 17 years by the end of February 2015.By the end of February 2015,it(excluding green area)has a total of 197 oil and water Wells,including 156 oil Wells,144 open wells.The verified daily fluid production is 10747 t,the daily oil production is 2730 t,thecumulative oil production is 2195.0905×104t and the cumulative liquid production is 3762.382×104t.The composite water cut has reached 74.6%.Since the development of the technology of directional well from the 80’s,horizontal well drilling technology has been mature.Horizontal well technology can significantly improve the marginal economic oilfield production capacity,reduce the comprehensive cost and improve oil production.In recent years,horizontal well has become an important part of development well ofHadexun oilfield.And a part of horizontal well has entered the water or high water cut stage,the level of water flooded layer logging evaluation is a complicated problem.Study on water flooded degree of horizontal wells control factors,not only is an inevitable problem of the development and production of the hadson Oilfield and the trail Road of deepening reservoir development,but slao is one of the key factors for oil yield and stable retention.The datas of many oil fields show that the water flooded degree of horizontal well is influenced by the structure,physical property and interlayer.After understanding of the geological structure,reservoir development status hardson oilfield overall understanding and petrology,reservoir layer of hardson oilfield spatial distribution characteristics,physical properties and fluid characteristics and combining with field data and field knowledge,we can find the existence of interlayer is one of the important factors controlling the hardson oilfield horizontal well water flooded degree of Donghe.Study on interlayer mainly through the identification and characterization of logging information,the calcite content of calcareous interlayer in logging interpretation is higher,the acoustic logging value changed obviously,and the value of low resistivity curve value and higher density(more than 2.5g/cm3),low GR value(20API-35API),muddy interlayers in well logging curves mainly reflects the characteristics of mudstone,microelectrode and deep lateral resistance value decreased significantly,generally less than 3.M,microelectrode curve is stable and amplitude difference is zero or very small,the natural gamma value is relatively higher,the steady low neutron gamma value,often less than 0.88 API;sonic high value,generally in more than 325 Mu s/m;the caliper curve expanding significantly,hadson oilfield of Donghe sandstone reservoir with good physical properties,belong to high porosity and permeability,and development in the middle stage,and continental oil fields across the standards it is difficult to draw a sandwich.The Donghe sandstone 26 wells have interlayer qualitative analysis a total of 821 measured porosity and permeability statistical analysis to determine the interlayer of the standard,the Donghe sandstone reservoir in the whole hole in the typical high permeability reservoir,reservoir porosity distribution is mainly 3.5%-22.8%,the average was 14.2%;permeability the main distribution range for(8-800)* 10-3 m2,with an average of 192 * 10-3 m2,and the calcareous interlayer characteristics of low porosity and low permeability,the porosity distribution is mainly 2-7%,with an average of 5.37%,mainly for the permeability distribution;interval(0.1-8)* 10-3 m2,with an average of 3.87 * 10-3 m2,in the Donghe sandstone area,especially the larger calcium barrier effect obvious interlayer of fluid within the reservoir,combined with field data,Hudson area of Donghe sandstone interbeds mainly calcium The interlayer is the main type,followed by dense interlayer and argillaceous interlayer,and the distribution of shale interlayer is less.Analysis of logging response characteristics,combined with the oilfield production dynamic stratum interface,interpretation and interpretation of the results of single well logging,3D function use level of water flooded zone logging software,the model of spatial distribution of the hadson oilfield of Donghe sandstone A,B,C and D were 4 wells of 5 well groups of 3D gamma density properties characterization,analysis of the relationship of physical changes and water flooded degree by sandwich effect,summarize the hadson oilfield of Donghe sandstone in different blocks flooding conditions and main controlling factors and distribution of the remaining oil,development and production of oil and gas guide.The main controlling factors of Hadexun oilfield of Donghe sandstone in different blocks is the main control function of water flooded layer on the water,using the existing hadson oilfield intercalations of Donghe sandstone in study,analysis of water flooding and the water flooding extent of Donghe sandstone horizontal well is an important control factor has four kinds: 1,no interlayer within the well group,bottom uplift the bottom water flooded;2,wells locally developed mud layers to seal,lateral flooding injection well around control;3,wells near the distribution of calcareous interbeds,water coning speed have obvious difference,water flooding and lateral flooding;4,well distributed near the physical dissection,water coning speed differences in bottom water flooding.