The acidizing-water shutoff joint operation technology is an effective method to resolve the plugging

control the water injection profile

and improve the injection effect of the damaged injection wells with the strong heterogeneity. There are many factors affecting the effectiveness of the acidizing-water shutoff joint operation. Due to the complex nonlinear relations of the various factors

the traditional statistical methods is limited. To solve this problem

and based on the analysis of the effect of the acidizing-water shutoff joint operation for the water injection wells

we calculate the correlation coefficients between the factors and the increasing injection ratio by the pearson correlation coefficient method. And according to the correlation coefficient

the relative importance of each factor is determined. Then

the weight of each factor is decided by the fuzzy analytical hierarchy process. This new method is used to calculate the injection wells in the Bohai Oilfield

and the decision value is consistent with the results of the field operation. This method is reliable and simples and provide the powerful guarantee for improving the success rate of acidizing-water shutoff joint operation for injection wells.