Hebei Central Sandstone Reservoir Profile Control Effect Evaluation And Adaptability Analysis

Currently the chief stable production measures in Jizhong sandstone reservoir is profile control of the injection wells. Profile control and the specific reservoir matching is very complex because of the varied geological conditions and the great differences of development characteristic between different reservoirs. It severely limits the application of the profile control technology in sandstone reservoir in Jizhong. On the basis of the comprehensive study on the reservoir characteristics, geological characteristics, development features of Jizhong sandstone reservoir, analyzing the profile control of the representative reservoir in the past three years and exploring the impact of the factors on profile control, he main works are as follows:1、This paper made statistical investigations of the profile control conditions in Jizhong sandstone reservoir. The statistics include the geology and reservoir conditions of the wells which had been taken profile modification measures, the history of the wells’development the injection situation, the production conditions, the profile control conditions.2、Investigate the relative material of the profile control evaluating method. In the past the evaluation of the profile control was just a simple list of the increase in oil production, decrease in water content, improvement of the water absorption profile. So it can’t make comprehensive and objective evaluation. While comprehensive evaluation can make an objective and accurate evaluation.3、On the basis of comprehensive profile control statistics in Jizhong sandstone reservoirs in the past three years, this thesis made statistical analysis of each well which had been taken profile control method by the means of fuzzy comprehensive evaluation method. On this basis the profile control effect in Jizhong sandstone reservoir were analyzed by year.4、Adaptability evaluation of profile control technology of Jizhong sandstone reservoir. On the basis of mathematical statistics, the adaptability analysis of profile control was conducted from the angles of reservoir, development and operation parameters. Then the absolute correlation degree, relative correlation degree and normalized correlation degree of each factor correlate with profile control were correlated and sorted by the means of gray correlation method. The results show that:the water cut made the greatest influence on the profile control effect and the factors in order of decreasing influencing degree are water cut, well group connectivity, profile control times, crude oil viscosity, permeability variation coefficient, well group reserves and profile control agent volume.5、Profile control effect prediction based on wavelet neural network. The wavelet neural network used in this paper is a combination of continuous wavelet function and BP neural network and the activation function of the hidden layer is the Morlet wavelet basis functions. The relationship model between profile control effect and the influencing factors is established through the training of the sample. The profile control effect prediction based on wavelet neural network has a higher accuracy rate, and it is scientific and feasible. The results of this study provide a strong theoretical basis and technical guidance to the profile control effect evaluation and prediction and have important application value.