The Experimental Studies of Physical Simulation of Bottom Water Reservoirs WithBarrier and Permeable Interbed on Horizontal Well

摘要

The paper presents the experimental study that is flow mechanism of bottom water breakthrough into oil well with horizontal well of barrier interbed and permeable interbed was studied, and reservoir physical simulations of barrier layer and permeable interbed flow of horizontal well were performed by 2D physical visible model. The model is made of two polymethylmethacrylucote planes of transparent and the metal frame that dimensional is 700mm′300mm′14mm.The production mechanism and flow behavior of bottom water reservoirs of barrier interbed and permeable interbedrnhorizontal well was revealed. All development process of water cresting of barrier interbed and permeable interbed were shown by the experiment. Meanwhile, the some rules that arernpoint displacement no better than the displacement of bottom water, and there is no phenomenal of w ater cresting to the permeable interbed, and result in water-free recovery percentrnof reserves and terminal oil recovery both are enhancement. The authors discovered that the weak permeable interbed had high water-free recovery percentage of reserves and terminalrnoil recovery after the weak permeable interbed compares with the barrier interbed. The experiment reveals the to effect horizontal well production rate on main sensitive factors, suchrnas the horizontal well length and the displacement pressure drawdown. The paper presents also same horizontal well length to increase pressure drawdown about two times thenrnterminal oil recovery to decline 3.14per cent and water-free recovery percentage of reserves to decline 13.7per cent to the weak permeable interbed. The bottom water reservoir of weakrnpermeable interbed and barrier interbed both should develop to mitigate water cresting and prolong bottom water breakthrough into oil well in the some degrees respectively. Using the multilateral well to build up manual barrier layer for the water control in bottom water reservoir with horizontal well. The new concept development has been established through the experiment.