| Kazakhstan south Turgay basin is south of the republic of kazakhstan important petroleum basins,In the urals-the shear zone seam turning point,is the base of uplift in haixi of the development of the Mesozoic rift basin,It has the base and remove tectonic pattern,a total area of about 8×104km2.The basin is divided into south,north two faulted reservoir and central uplift,Oilfield development of Mesozoic strata bottom-up area before Jurassic and cretaceous,bedrock,early tertiary and quaternary system,Among them the cretaceous and the Jurassic,between Jurassic and the former Mesozoic,bedrock are in between Angle unconformity contact.Research area in the north and south is mainly MⅡ strata buried the beatles anticline reservoir,The central MⅡmainly distributed in reservoir buried in the surrounding valleys erosion,At present,the MⅡ,J3ak sandstone and basement metamorphic rocks are in for commercial industry,Among them is MⅡ is the main production horizon.Kyzylkia northern MⅡ layer material sources of oil from work area in the northwest and development in the delta front,delta front of underwater distributary channel sandbodies distribution wide,shallow lake fine-grained sediments equal relative owe development;Kyzylkia oilfield MⅡ layer around the central uplift area development underwater alluvial fan sedimentary system by the central uplift area respectively to the lake district development fan root,fan,between the door and the door,phase;Kyzylkia southern oil layer material sources of research from MⅡ southern region,a shallow water,for the overall is spinning back deposition,bottom accidentally see conglomerate.MⅡ reservoirs are mainly distributed in nine oil unit,including two northern,five central and two southern,in the area of 61.44 km2 oil,The oil reservoir type is mainly lithologic reservoir.Oil reserves of confirmed 2081.2×104t,one block north for 889.6×104 t.Through the analysis of characteristics of the production on the reservoir,oil field development exist in the following problems:1)Formation pressure drop quickly,at present formation pressure remains level is low.2000-2004 on the side of the natural oil field of bottom water mining,formation pressure decline faster,Started in 2006 have water injection,formation energy resumed,but because the fluid quantity continuously increased,accumulative total injection-production than last a low,declining formation energy,by now in December 2010,formation pressure for only 7.19,below saturation pressure 8.22 MPa,the pressure to keep degree is only 46.2%.2)Formation pressure distribution and east formation pressure keep low.East formation pressure is 10.18 MPa,keep the 60.6%level,west formation pressure is 14.6 MPa,keep the 86.9%level.3)Without water injection well point,formation pressure down fast.Due to the late south put into production,the oil well production time is short,the pressure to keep the level of 73.5%,but because there is no water injection well point,in the construction of a productivity of fast a year(2010),and the pressure decline was reached 3 MPa.4)Production decline faster.And,before 2008,comprehensive moisture content is less than 60%,year overall decline over the well open with old well.with the decrease of the oil production speed and slow;2008 years later,go to comprehensive moisture content more than 60%of medium water cut stage,the number of old well.qiaoying left basically unchanged,comprehensive diminishing in affected by moisture content,with water,the rise of the decreasing speed up.5)Water cut up fast.High water reservoir with northern more;The central reservoir water injection well point less,injection-production imbalance,local water higher;Southern water reservoir rising fast.This research in the northern oil fields MⅡ reservoir as object of study,the reservoir engineering method and in combination with numerical simulation,finally complete development scheme adjustment design and stimulation measures.1)Using material balance equation,elastic recovery and dissolve derived,respectively gas drive process calculation formula to calculate elastic energy and dissolved gas drive process,and calculation of water flooding energy to drive coefficient,combined with years of water invasion of oil field,and evaluate reservoir driving way.Use non-dimensional elastic yield ratio and unit pressure drop of recovery degree comprehensive evaluation natural energy to drive ability.2)Separately using experience formula method,analogy method to determine the drive process,finally to water drive process of comprehensive evaluation.3)Cher card brought experience formula and analogy different reservoirs flow coefficient the determination of reasonable well spacing well spacing and economic limit well nets spacing.4)According to the system well test material,the determination of reasonable production pressure difference;According to Kyzylkia northern oil fields MⅡ reservoir 50 blocs early production stable yield average single well,stable production period(three years)average yield on the single well determined comprehensively and stable coefficient;Application meters oil production index method,oil intensity method and analogy method determined comprehensively the single well productivity.5)According to the geological modeling results are respectively set up structure,NTG,porosity,permeability and numerical simulation model.According to the fluid property analysis results,establish reservoir fluid properties can be used to characterize the PVT model;According to the geological reserves calculation used the original oil saturation(0.641)endpoint calibration,using experience formula calculated respectively oil and water,oil and gas relative permeability curve.According to Kyzyklia 56 oil Wells in northern mouth production and oil material,establishing the dynamic model historical fitting,choose Eclipse 100 black oil simulator simulation calculation,the fitting results are good.And then with the application of the model and the pressure distribution of remaining oil distribution features guidelines prediction research6)According to the present status of development,the oil reservoir engineering method research conclusion,reservoir numerical simulation results with geological understanding,stimulation measures and the adjustment of the scheme design and the expected result.Through this research,puts forward the injection-production patterns nets Suggestions,proposes to 5 conversion wells,form a perfect well spacing,the deployment of new Wells six mouth;Adjust the water absorption profile improve flat profile contradictions,and improve the efficiency of the injection,stop the note 2 wells;Well after the completion of oil Wells partial implementation net measures 8 wells,including fracturing well one time,carry liquid five wells,fill holes two wells;Is expected to increase production capacity,crude oil measures 50 m3～70 m3,slowing down the natural decrease 5～6%;The recommended scheme for the nine area of water injection,injection-production ratio 1.2,adopt liquid speed by 5.5%～6%,the rate of oil around 3%.3 years increased oil can be accumulated 15.6 x104t,improve shuanghe,Forecast to 2037 can improve 5.9%stage recovery degree. |
PDF Full Text Request