Method Of Controlling Low Effective Injection Production And Tapping Remaining Oil Within Layer In Lamadian Oilfield

In the light of serious inhomogeneous, inefficient circular thick oil layer in Lamadian oilfield, the study on recognition of inefficient circulation and the method of controlling interlayer inefficient injection and production and tapping the latent power of remaining oil are developed. Based on mastering sufficiently sedimentary character in Lamadian oilfield, applying a comprehensive method, distribution character and inefficient circulation of remaining oil in thick oil layer in Lamadian oilfield are studied, forming condition, forming rule ,distribution condition of remaining oil and inefficient circulation during high water cut are clarified. Dissecting carefully SA, Pu reservoir shows the sedimentary model and inhomogeneous property. Interlayer remaining oil is generalized into five models, such as laminar structure unit remaining oil of steadier structural interface distribution, collect suspension, end plate superposition, cuneal insert, cross maze. Mineral composition of reservoir rock, pore structure of rock, air permeability, effective porosity, alternation rule of mud content after forming inefficient injection and production circulation are analyzed, six comprehensive recognition and description methods of inefficient circulation are developed based on accumulative flooding times, numerical model calculation, injection profile information, water detection information for oil wells, falling velocity of separate pressure for water injection wells, subdivision geological research during high water cut. Some methods are researched stressly, such as cyclic waterflooding, reducing injector and producer distance, tapping the latent power of struction unit remaining oil of imperfect injection and production, interlayer subdivision waterflooding and plugging. The effective method of controlling inefficient circulation and tapping the latent power of remaining oil during extra-high water cut for Lamadian oilfield are innovated, obvious results are obtained in application, the method has an extensive application prospect.