Evaluation Of Acid Fracturing On Carbonate Reservoir In MM Oilfield

Ordovician carbonate reservoirs in MM Oilfield have complex geological conditions with poor matrix physical properties and strong heterogeneity.In recent years,the study area adopted the means of acid fracturing but failed to achieve the desired results.In this paper,in order to find out the situation of acid fracturing communication,the main influencing factors and reservoir types of acid fracturing operation based on the reservoir characteristics of the study area and the data of acid fracturing modification in the previous period,the factors influencing the acid fracturing effect and the best way to guiding the acid fracturing evaluation in the study area were discussed,which including the following aspects:(1)Through the analysis of geological characteristics,reservoir physical properties,reservoir space system and fluid properties in the study area,exploring the problems and difficulties that need to pay attention to in the study of acid fracturing operation;(2)Through the analysis of the acid fracturing process and liquid system used in the study area by the effect of acid fracturing,discussing the applicability of acid fracturing process and liquid system in the study area.(3)Through the acid fracturing simulation program,analyzing the influencing factors of acid fracturing parameters.(4)Through the analysis of gray relational analysis and BP neural network,clear the main influencing factors of acid fracturing effect on geological factors and construction factors.(5)Through the statistic analysis of the curve of acid fracturing construction curve,net pressure curve and other data curves,combined with the typical wells in the study area,establishing the acid fracturing communication reservoir type discrimination table,which can be directly and effectively guiding study-area's acid fracturing effect.In this paper,the main factors influencing the acid fracturing effect of carbonate reservoirs in the study area are probed and the tables of acid fracturing communicating reservoir types in the study area are established to evaluate the acid fracturing effect,which is more intuitively and accurately,guiding the acid fracturing program development and acid fracturing effect evaluation in study area.