Study On The Potential Tapping Measures Of Water Cut Period At Ma18 Block Of Liaohe Oilfield

Liaohe oilfield has more than 40 years development,has given a good development effect,many times to adjust after entering for determining,look from the formation,perforation long,permeability differential,serious conflict among layers,reservoir thickness change is bigger.Look from the development effect,water flooding formation water cut is high,the formation water difference between small,producing extent there are differences,remaining oil distribution of scattered,inefficient invalid injection-production cycle.According to individual or a series of adjustment,therefore,it is difficult to fundamentally achieve scale improvement,and difficult to adjust.For determining remaining oil potential finding and improving water flooding development effect,it is necessary to carry out the scale formation of well pattern adjustment.This article 18 block in liaohe oilfield the horse as the research object,comprehensive analysis of development status quo and the numerical simulation of the formation of recombinant technology policy limit,including differential permeability,effective thickness and stratigraphic coefficient differential,and determines the formation principle of restructuring,combined with the actual situation proposed three kinds of formation restructuring,the method of using fuzzy comprehensive quantitative adjustment scheme determines the formation.After block fine geologic model and numerical simulation model is established,on the basis of history matching,get the block of remaining oil distribution law;Adjustment scheme based on the principles of well pattern adjustment,combined with the formation,put forward four kinds of well spacing,using numerical simulation to predict,recovery degree,workload and economic evaluation concluded that the optimal scheme: namely an encrypted 8 size injection-production well as injection Wells,all new drilling Wells,a 212 m five point area of well pattern,mining horse Ⅰ 6 ~ Ⅱ 3 series;All secondary encryption 1 font size injection-production well as injection Wells,a new drilling Wells,a 212 m five point area of well pattern,mining horse Ⅱ series 4 and below.The scheme is divided into two sets of series,using two sets of 212 m five point well pattern,new drilling of 54 production,stage of recovery is 6.04%.Fetch $70 / barrel crude oil prices(3149 yuan/ton),after-tax financial internal rate of return is 20.2%,investment recovery period is 3.9 years,the forecast of economic benefit effect is best,development effect to reach a higher level.