The Rock Mechanical Properties Of Fractured Reservoir And Its Influence Of Studying Hydraulic Fracturing Initiation

As the exploration and development to deepen in China, in recent years the reservoir type of new proven to be more complex, especially the proved reserves of fractured reservoirs is increasing. Because of the presence of natural fractures in fractured reservoirs, it is prone to be the violence flood in the case of high injection pressure in the post development. Currently, the investigation on capacity of hydraulic fracturing wells is more, while the hydraulic fracturing study on the impact of considering rock mechanical properties in natural fractures reservoir is also less, so it is very necessary that the study of hydraulic fracturing initiation based on the rock mechanical properties in the fractured reservoir.This article, firstly through three reservoir-the Yao Yingtai fractured reservoir, Yong Jin NO.1 depth reservoir and Ta He carbonate oilfield, using dynamic test method and static test method to study the rock mechanics characteristic parameters (elastic modulus and poisson's ratio etc)of fractured reservoir, concluded that the rule of rock mechanics properties in fractured reservoir;Secondly, through the prediction theory of natural fracture opening, we draw on the conditions and influencing factors of natural fracture opening and development; through the mechanical analysis of fractured rock cracking, we obtained that natural fractures will occur earlier than the hydraulic fracture, When in the right conditions, for the existence of natural fractures in the fractured reservoirs in the hydraulic fracturing; due to the presence of natural fractures in the reservoir the fluid loss is not constant, the presence of natural fractures affecting the chang of pressure drop curve a large extent, we predict natural fractures through the theoretical analysis of the derivatives of the G function;Finally, with Yao Yingtai, Yong Jin NO.1 and Ta He oilfield engineering examples, we choose the proppant of conductivity and mechanical properties combined with existing natural fractures and different of rock mechanical properties; The different mechanical properties of rock, the different requirements to fracturing equipment and column of the pressure, we are guided rationally to select fracturing equipment and string; through log data obtaining the pressure drop curve, with the derivatives of G the function predicting of natural fracture, they can instruct hydraulic fracturing.