Wuliyasitai Depression Glutenite Reservoir Fracturing Of Key Technology Research And Application

Many researchers home and abroad have investigated the characteristics of glutenite reservoir, but the study of glutenite hydraulic fracturing in our country is few, so the research of hydraulic fracturing on glutenite reservoir is necessary. At Erlian Basin, wuliyashitai oilfield is glutenite reservoir, where facies change is fast, changes of lithology and permeability is large, pore space is not developed, separation and connectivity is poor, microcrack is developing and heterogeneity is severe. Because of these, it's considered of low porosity and low permeability reservoir, most of wells can be put into production till hydraulic fracturing.Effictiveness of some fractured wells is poor, this article analysis the effictiveness of hydraulic fracturing and summarise the causes. Here, I finished some aspects as follows, including some conclusions and realizations.The choose of fracturing wells and layers would directly affect the effect of production after fracturing .But it has no rational method of how to choose fracturing wells or layers in this region except geology methods. But geology methods don't include the effects of execution parameters and production parameters, and it can not make a qualitative conclusion. Here, we use grey theory to seek the affect parameters, including permeability,porosity, oil saturation ,layer thickness ,proppant concentration,sand volume , fracture fluid volume and flowrates. Fuzzy identify model of Candidate selection have been found by using fuzzy mathematics .The model have taken parameter of fracturing treatment into account and broke through the limited of geology methods. The model is used not only selection the well and layer, but also optimize the parameter of fracturing treatment.when fracture design, the loss of fracture fluid and formation are the key points considered. Now, the paper aimed at reflecting the loss character of glutenite by using the experiment of dynamic fluidloss and utilizing the experiment data fully. According as loss experiment ,use FLIC for reference removing the time variable simpling the reservoir region and introduce fluid loss coefficient which is function of time. on the assumption that Newtonian filtrate,considering the three region, established fluidloss model based on experiment ,forecasted the rate of loss and the volume of fluidloss, ultimately gained fluid loss coefficient which is changed with time. After introducing fluid loss coefficient which is changed with time, the model can reflect the effect of non-linear fluidloss and the degree of deviation linear fluidloss.The fracture conductivity is an important parameter in fracture optimize design .it is very important that determine the closure pressure before the proppant selection. This paper according to the correlation analysis between result of well logging and rock mechanics experiment, found the model of dynamic and static parameter, and found layered stress model by inversion the data of well logging and fracturing treatment, then can determine the closure pressure rightly. Besides, use breaker fluids to test the short-term flow conductivity to select proppant. evaluate the effects of gel fluid and sullage content of the erlian fracturing and new...