Analysis Of Water Flooding Characteristic Curve Uesd In XJ24-3 Standstone Reservior With Heavy Edge-water And Bottom-water

As a standstone reservior at the east of South China Sea,XJ24-3 reservior has heavy edge-water and bottom-water.It’s recovery efficiency is greater than what had predicted before after long-period water drive.By 2012,XJ24-3 reservior’s recovery efficiency has reached to 61.6% and it’s cumulative oil output rised between 2010 and 2012.In addition,there has no complete method of water flooding characteristic curve aimming at standstone reservior with heavy edge-water and bottom-water.So finding an accurate and appropriate method allows of no delay.In this paper,writer first using method of dynamic analysis to insure that selection criteria of water flooding characteristic curve must depend on the forecast error of water-cut,cumulative oil output and cumulative water output,rather than fitting correlation coefficient.The paper analyzes adaptability and forecast error of six kinds of water flooding characteristic curves according to XJ24-3 reservior.One of the conclusions of the paper is that different kinds of water flooding characteristic curves have different adaptability for different watercut increase types.Theoretical basis of classical water flooding characteristic curve is B-L theory and Welge equation,so classical water flooding characteristic curve cannot be uesd at predicting bottom-water-flooding.It just can be uesd at predicting edge-water-flooding,pattern water-flooding,secondary edge-water flooding and bottom-water-flooding whitch is Close to end of the exploit because the flooding of XJ24-3 field with heavy bottom water cannot be regard as one dimensional displacement.This paper points out that the shape of water dynamic relative permeability curve after long-period water drive is convex,which cannot be reflected through classical water flooding characteristic curve.In order to solve this problem,this paper revises the parameter P of eurytopic water flooding characteristic curve.The Parameter Range is 1.95 to 2.00.This paper compiles software of fitting curve.Practical calculation certificate the predict error is smaller than before.The paper summarizes the method of ultimate recovery prediction of water flooding characteristic curves from three aspects,which is suiitable for reservior with heavy edge and bottom water.The method is used in H4 D reservior of XJ24-3 field and forms a forecast chart of ultimate cumulative oil output of single well,which can provide a reference in the future forecast.The method of ultimate recovery prediction of water flooding characteristic curves comes from this paper provides a theoretical basis for other similar oil fields.