Study Of Development Method In Fluvial Facies Positive Rhythmic Thick Oil Layer

Fluvial facies is a representative reservoir type in eastern China. Scattered oil sand bodies, poor areal connectivity, and especially severe vertical and areal heterogeneity of fluvial facies positive rhythm thick oil layer lead to fragmented distribution of remaining oil that is hard to develop; simultaneously, the distribution status of interbeds in thick oil layer within the injector producer group has a great influence on oil and water movement and development effect. Aiming at the channel sand, on the basis of the study of geological characteristics, and by means of numerical reservoir simulation technology, this paper carried out analysis and study on the development method of channel sand positive rhythm thick oil layer. The main contents of this paper are:1. Analysis on geological characteristics: After analysis on heterogeneity and interbeds of channel sand positive rhythm thick oil layer, and in accordance with the vertical distribution of interbeds, the thick oil layer is divided into four types: no interbeds in the layer, interbeds in the upper section of the layer, interbeds in the middle of the layer, and interbeds in the lower section of the layer.2. Study on development mode: Aiming at the four different types of thick oil layer, by means of numerical reservoir simulation technology, considering the two situations of interbeds in oil well and interbeds in injection well, study on location of perforation according to different development mode for perforating on upper, middle, lower section of oil and water well was carried out, then based on the perforation location study, and given the ratio of perforation thickness to layer thickness for oil and water well is respectively 25%, 30%, 50%, 66%, 75%, 100%, we conducted study on perforation thickness of which optimum development modes for different types of thick oil layer come out.3. Study on water flooding direction: Using numerical reservoir simulation technology, we perform the study on water flooding direction by designing different plans according to the different angle between water flooding direction and channel direction.4. Study on well spacing pattern, injection timing and injection-production ratio: Perform study by means of numerical reservoir simulation technology in accordance with the geological characteristics of Cha-12 fault block reservoir in the oilfield of Chaheji, and on the basis of optimum well spacing pattern, analyze injection timing and injection-production ratio.5. Development effect analysis. Apply study results to Cha-12 fault block, and compare results of numerical simulation with the development effect under current development method.This paper performed systematic analysis and study on development method of channel sand positive rhythm thick oil layer, which is of certain theoretical value and application prospects, and provide referenced technical methods and research ideas for enhancing recoveryfor future scientific development of channel sand positive rhythm thick oil layer.