Fracture Height Predication And 3D Mapping In Fractured Horizontal Wells Based On Well Logging Data

Chang 6 reservoir of longdong region in Ordos Basin is a typical low porosity,low permeability and low formation pressure reservoirs,usually by way of fracturing horizontal well perforation to improve single well production.Logging data has characteristics of good continuity,high resolution,the logging data used for horizontal prediction and detection of fracturing,can provide effective guidance for fracturing stimulation.Fracturing prediction include determining the crack position,calculating the length and height width of fracturing;Fracturing testing involves the compressive fracture development position,development degree,etc.This paper,taking the chang6 reservoir of longdong region as the object,has carried out the logging prediction of horizontal fracture height and the three-dimensional mapping research,has obtained the achievement and cognition:(1)The author has collected drilling,geology,logging data in work area,and extracted P-S wave offset time from DSI logging data.the model of rock inherent strength were also established.the dynamic mechanics parameters has converted to static rock mechanics parameters with the relationship of the dynamic-static mechanics parameters.The sections of rock mechanical characteristics in the workplace were established,and the rock mechanical properties profile in work area were obtained;improve stress calculation model and establish stress profile.(2)Considering multiple clusters crack extension at the same time,by the displacement discontinuity method pressure fracture height prediction and the flow distribution model is established,according to estimates the crack width and brittleness coefficient has been obtained by the volume balance length,the simulation results were compared with Meyer.The error is less than 10%,which shows that the result is reasonable and reliable.(3)In this paper,based on this idea,launched VDL and DSI horizontal well pressure response characteristics of fracture simulation experiments.Through to obtain VDL and DSI,variable density diagram and anisotropy analysis,extract the pressure after a series of sensitive parameters identification of fracturing.(4)Based on the Lead3.0 platform,the author has compiled the stress and rock mechanics parameters calculation program,compiled the hydraulic fractures extended forecast program based on matlab,has processed several wells.Through these studies,a set of computing stress,three formation pressure and fracture extension methods and techniques were established with logging data.The results of which is reliable,and has a good comparability with log software and fracture forecast software.In 3D mapping,the results of prediction and detection show good comparability.