Research On Influencing Factors And Parameters Optimization Of Downhole Water Sink In Reservoir With Bottom Water

Bottom water coning is the biggest problem in reservoir with bottom water, due to coning, water break through in advance, production fall sharply, water cut increase fasr and eventually water treatment cost and development cost rising. So the key technology of bottom water reservoir development is inhibiting bottom water coning, extending water-free production period and controlling bottom water to displace equably, which can improve development. In order to reduce water cut growth, regain and raise oil production, downhole water sink (DWS) technology has been carried out to control bottom water coning and to solve bottom water coning fundamentally, simultaneously DWS provided research approach and method for the quick and efficient development of reservoir with bottom reservoir.Basing on a great deal of researched literatures, combining field test of the reservoir, the article employes numerical simulation model to research on the influencing rules of DWS factors and parameter optimization. Firstly, according to the field geological conditions the typical reservoir numerical simulation model is built; then makes the model conform to reality through history match,and the article researches the remaining oil distribution rules and finds where the remaining oil is and provides direction for future development. Secondly, typical single well model is intercepted to study DWS influencing factors, in which the main influence factors including reservoir geology characteristic parameters(Kv/Kh, the location and size of interbed bilayer and bottom water energy size) and process parameters( perforation position and open degree, the drainage layer, drainage speed and liquid production speed), in addition to oil-water viscosity ratio, oil well bottom-hole pressure and drainage well bottom-hole pressure are studied. On the basis of single well DWS influencing factors study, the orthogonal experimental design method is used to calculate and obtain optimal DWS parameters, then parameters optimization scheme development indexes are predicted and contrasted. Thirdly, optimize drainage speed of different development phase and operation system, meanwhile perfect into typical chart on the basis of water coning dynamics research. Then screen out typical group to analyse the effect of injection and drainage speed, optimizing the reasonable drainage speed, liquid production speed and water injection speed, and development indexes and the remaining oil distribution of optimization scheme is forecasted.