A Study On Productivity Of The Well With Hydraulic Fractures

Hydraulic fracture technology is a promising stimulation method in a variety of aspects, mainly based on the evaluation of hydraulic fractured wells. The history of hydraulic fracture technology is reviewed and the developing character and character of field is summarized firstly, then the increasing production mechanism and main influencing factors of hydraulic fracture technology is expatiated, in the following part, quantitative evaluation method of production potential and petroleum reservoir engineering optimizing method of hydraulic fracture technology are studied as emphasis by physical and mathematical simulation methods, some new ideas that are not reported in former before, in the last part, new production decline curve and non-linear IPR equation including non-darcy effect of gas seeping are obtained. The essay mainly contains the following characteristic conclusions: 1. Pointing out the significance of dimensionless flow conductivity of hydraulic fractures based on the analyses with fluid mechanics in porous medium, dimensionless flow conductivity is the ratio of the liquid flux out of the fracture with the liquid flux into fracture. It's very important to understand the signification of dimensionless flow conductivity, it can make the field engineers know the importance of flow conductivity in hydraulic fractures. 2. Evaluating three fracture models and the result of electrical analogy. electrical analogy to the production potential of vertical fractured wells is a kind of analogy between mechanism modeling and scale modeling, the result of it is approximative and the shape of the curve is relatively good, but it is relatively bad in quantification, it can be replaced by the result of mathematic simulation. 3. Experiments of flow conductivity closure stress of typical propping agent are done, propping agent short-term flow conductivity alteration index is defined, by this, the relation between fissure short-term flow conductivity and closure stress, it is close to exponential relation. 4. Establishing the mathematical simulator of hydraulic fractured well's production in a steady state, finding the relation curve between dimensionless flow conductivity and fracture penetration coefficient by means of calculation and analyses, it is the basis of hydraulic fracture. 5. Expatiating the importance of optimized hydraulic fracturing design in reservoir engineering, advancing the optimizing design method, fracture dimension can be calculated easily when the physical parameters are known. 6. Production rate decline standard curve of vertical fractured wells is achieved by mathematical simulation, when the flow pressure is certain , by asymptotic analyze, this decline curve is close to exponential relation. 7. The mathematical simulation gives a non-linear IPR equation for vertical fractured wells aiming at the non-Darcy effect and a piece of standardized production decline curve. By this equation, when the average pressure is known, gas output can be predicted. The essay develops the analysis theory on hydraulic-fracturing-sustained productivity, which can be put into service for on-site operations.