In the late stage of extra-high water cut

the difference of fracturing layers becomes smaller and smaller

the geological factors taken into account increase gradually

and the combination of fracturing layers becomes more and more difficult

so that

the parameters

such as reservoir

physical property

oil content and production capacity

which can reflect reservoir characteristics are optimized. By using the mutation progression method

the multiple parameters of each small layer are reduced to one comprehensive evaluation value. Through this evaluation value

the quantitative combination of fractured strata is carried out

which solves the problem that some sand bodies in the fractured strata can not be fractured due to the unreasonable combination of fractured strata in the late stage of high water cut

and realizes the efficient and intelligent combination of fractured strata. By this method

the stratified combination of 25 fractured wells in the study area is completed

and the average daily oil increase is 0.5 t more than that of a single well in the same period

achieving a better effect. It is a good reference for the quantitative combination of fractured layers.