The Adjustment Of The Well Patterns And Layer Systems And Developmental Effect Evaluation Of GTZ Oil Layer In The Mid-eastern Block

This passage firstly analyses the characters of geologic reservoir and the current status of exploitation in GTZ oil layer of Sa zhong Developmen area of Saertu oilfid.There are 92 layers of sediments and 4 oil layer groups with using three sets of well pattern to develop.The three sets of well pattern are GI well pattern,GII well pattern and GIII-GIV well pattern.The well spacing of three sets of well pattern is 300m?300m.They are all nine spot pattern.The water cut of area has already reached 90.67% at the high water cut stage.The water cut difference of each set of well spacing is so large.And the declining rate of the whole area and each set of well pattern declines so quickly.Thus some stimulation treatments need to be done to enhance oil recovery.Next on the basis of the characters of geologic reservoir and the current status of exploitation,Petrel software will be used to build the three-dimensional geologic model including structural model,precipitation facie model and property model.Vertically,each sedimentary unit as a simulation layer,there are 92 layers.The step of the layers is 20m×20m.The total number of grid is 102.45×104.Fitting the reserves of whole area will provide basis material foundation for subsequent well pattern adjustment.Eclipse numerical simulation software will be used to history match the liquid producing capacity,water cut and injection flow rate.The remaining oil saturation of each sedimentation unit and regularities of distribution of remaining oil before adjustment will be researched.Totally,the umulative oil production of the major reservoir is little.The reserves of remaining oil are still large.Totally,oil production of main layers is still less,the remaining reserves are much larger.Thus,there is still a considerable potential in potential.Material basis will be provided for well pattern adjustmentBased on the reservoir method,numerical simulation method and the economic evaluation theory,technical economic limits are(1)The single well drilling costs 2.3 million yuan,the price of crude oil at $40 a barrel recoverable reserves of the lower limit of 6299.79 t.Well spacing is 250 m,the lower limit of effective thickness of 2.69 m,single well spacing is 125 m single well lower limit of effective thickness of 10.76 m,well spacing is 300 m single well lower limit of effective thickness of 1.87 m.(2)Permeability differential control within 3.5-4.5.(3)The saturation differential control within 1.1-1.12.(4)Within the same formation reservoir number control within 10 to 20.(5)Production wells should be less than 100 m span,span can effectively reduce production sections of interference.Based on the research achievements of reorganization of formation boundaries,design of restructuring and well pattern reconstruction scheme,formation restructuring.GI1-20 series are reservoir exploitation of GI.GII1-26 series are the GII.Design pattern reconstruction scheme,GI1 GI20 strata,GII1 GII26 series with 300 m spacing nine point well patterns,GII27 and below strata is adjusted for 106 m spacing of the five point well pattern.Deployed to the total number of Wells for 592,which the new drilling 409.87 new drilling needs fracturing,acidizing,10 and adjustment scheme of development effect evaluation and prediction.A set of layer systems and well patterns limits will be designed and a set of well patterns deployment scheme will be designed.For development zone in high reservoir effective development has the significance.