Based On Wavelet Analysis Interwell Connectivity

In recent years, with the rapid development of China's oil industry, most of the water injection into oil fields has been high, high water cut stage of development. Are secondary recovery water injection has become the main means of sandstone oil reservoirs. Developed for water reservoir, through the inter-connectivity of wells can clearly drive the direction of water wells to determine the remaining oil, then develop the appropriate development adjustment measures leading to improved development results. At present, based on different data on the study of connectivity between wells are many ways to describe the methods of geological and geochemical methods are static methods, but with the reservoir development, reservoir parameters continued to change, does not accurately reflect the dynamic development process changes and formation properties. Well test analysis and tracer studies testing methods can accurately connectivity between wells, but it takes a long time shut-in. Numerical simulation method to study the connectivity of the quantitative and dynamic changes, but requires numerical simulation of the early geological modeling takes a lot of manpower, material and time. Dynamic data analysis method is the most simple and practical, cost the province, does not affect the production, operation is simple, so most receptive field engineers. And because the signal noise in the reconstruction of wavelet analysis that has other mathematical methods can not match advantage, so this article will be applied to inter-well connectivity study, and make the following main tasks:(1) Geological conditions at the scene select a different set of data as well:the water injection rate, fluid production, well pressure;(2) Group of well production data by the wavelet smoothing filter, to smooth fluctuations in the pressure data and production data to remove noise or reduce noise impact on the overall data trends.(3) Analysis of injection water injection wells of a time series with the surrounding fluid production wells in the correlation coefficient between the time series to verify connectivity between the two wells.(4) According to the actual situation of production and reservoir development, the establishment of connectivity between the well group model, and verify the reliability of the method.