A Study On Distribution And Potential Tapping Of Remaining Oil In The North Area Of QHD32-6 Oilfield

The study on remaining oil distribution is not only a worldwide problem but also a frontier subject in fields of geology, physics of the Earth, reservoir engineering and so on. QHD32-6 oilfield, located in central Bohai Sea, is a large-scale draping structure. Its reservoir is in complex fluvial facies, with shallow depth and high viscosity. The northern reservoir controlled by structure, fault, edge(bottom) water and lithological character, has complicated oil/water system, and there is not a period of production without water.This article aimed at the development characteristics of the north area of QHD32-6 oilfield, analyzed its development dynamics such as the law of water cut increasing and production decline. Using the method of reservoir engineering, the water flooding development effect of the study area has been evaluated from following aspects of recovery, water flooding control degree, water storage rate, water drive index and volume sweep efficiency etc.In the numerical simulation, aiming at the reservoir characteristic in this block, Eclipse is used to build numerical simulator in accord with the real reservoir. Some development indexes such as field geological reserve, oil production, water production, and water cut are history matched according to the production history, and the matching degree basically comes to the technique require. After analyzing all the development indexes we know that, the remaining oil mainly distributes in the edge of sand body, interwell stagnant zone, incomplete zone of well pattern, near the fault and structural high etc.Finally, according to the remaining oil distribution characteristic, some rational potential tapping measures are made. And after using Eclipse software to predict some adjusting projects, the best one is chosen out by comparing with each of them and analyzing, which accumulates valuable experience on how to develop efficiently and how to enhance recovery in the later development stage for the north area of QHD32-6 oilfield.