Research And Development Of Technology Changchun Ridge Oilfield Main Body

How to develop the difficult to produce oil and gas reservoir has become a problem of common concern in the world economy effectively.The development of oil fields at home and abroad,the key of oilfield exploration and development of oilfield development evaluation become subject.Changchun ridge oilfield exploration work has carried out regional geological survey,geophysical prospecting and drilling work.Have in determining the Changchun Ling area exploitation value,need fine reservoir study of Changchun ridge area,research on fluid properties,clear the main factors restricting the development of oilfield,the main technology of oilfield development.Changchun ridge oilfield belongs to fractured porous sandstone reservoir,suitable for Changchun ridge oilfield development are flooding water flooding and steam flooding,fire.Steam flooding is a heavy oil reservoir after steam huff puff,mining method for a heat to further enhance oil recovery by cyclic steam stimulation,because only produced all around well in the oil reservoir,a large number of dead area is left between the oil well and oil well.Steam flooding,is from the injection well to the formation of a continuous steam injection and high dryness steam continuously,heating oil,thus greatly reducing the formation oil viscosity.Into the hot fluid injection steam in the stratum,the crude oil into the surrounding production well,and was taken to the ground.Water flooding is an important method of enhancing oil recovery of three oil production in low permeability reservoir,the water injection of low visccosity of oil and improve the recovery measures.For low viscosity in low permeability reservoir,the water injection,improve the oil recovery mechanism is:reduce the viscosity and improve the mobility ratio.For low permeability,low oil viscosity reservoir,temperature,oil-water viscosity will reduce crude oil viscosity,decreased significantly,resulting in oil-water mobility ratio.Changes in residual oil saturation and relative permeability changes.When the temperature is increased,the residual oil saturation decreases significantly,and the temperature increase can improve the phase permeability curve.Fluid and thermal expansion of rock.The injection of hot water will cause the expansion of underground fluid and rock,and thermal expansion coefficient of crude oil than water coefficient of thermal expansion,this enables the formation pressure is restored to a certain extent,so as to enhance oil recovery.Decreasing interfacial tension.Hot water flooding can reduce the oil-water interfacial tension,so that the adsorption on the surface of the rock fall of crude oil,change the wettability of rock surface.Fire flooding is a method of using electricity,chemistry,oil temperature oil ignition,methods of extraction and injection into the oil layer of air or oxygen reservoir crude oil to continue burning.