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Structure Stress Simulating And Prediction Of Fracturing Of Low Permeability Reservior Of Daqing Oil Field

Posted on:2011-01-26Degree:DoctorType:Dissertation
Country:ChinaCandidate:S Y HeFull Text:PDF
GTID:1220360302492519Subject:Mineralogy, petrology, ore deposits
Abstract/Summary:PDF Full Text Request
Surrounding and deep formations of Daqing oilfield are filled with low-permeability thin-interbedding reservoir, which is bad physical characteristics, thin reservoir, heterogeneity, fracture and low productivity. For the production of low-permeability reservoir, hydrofracturing is currently the most economic and the most effective technique to improve reservoir permeability as well as to enhance productive capacity. Current hydraulic fracturing design pay most attention on technology, but pay less or lack attention to fundamental geology characteristics, under this condition, the hydraulic fracturing performance are usually not so good, in order to improve its performance, an integrated approach combined hydraulic fracturing technology and geology study are proposed. Let’s take Daqing Zhaoyuan oilfield Yuan212 block as our study area with the application of this new integrated approach, by means of its 200+ exploratory well data, appraisal well data, FMI resistivity image logging data of 4 wells, XMAC cross multiple array acoustic logging data of 4 wells, and take into account that this Fuyang reservoir is a low permeability reservoir, we did rock mechanics parameter calculation, structure stress field analysis, artifical fracture prediction, hydraulic fracturing design optimization, etc., our objective is to construct a subsurface geological body 3D stress field model to assist hydraulic fracturing design so as to improve hydraulic fracturing performance. By our study, following innovative achievements were acquired:1. Adopting multiple regression technology, well log 3D model is built up by calculating Poisson ratio, Young’s modulus, rock fracturing pressure ,rock closure pressure, which is more accordant to this block. than theoretic model.2. Combining 3D seismic data and well log data to establish rock mechanics model, thus rock mechanics parameters such as Poisson ratio, Young’s modulus, rock fracturing pressure ,rock closure pressure of the reservoir can be got. This method is more credible because it ties multi-information to get the rock mechanics parameters.3. Combining conversation law and curvature calculation to forecast fracture distribution measures up to the real condition. Thus this method is adapt to Daqing and another oil field with similary geological condition.4. Combining well log、seismic、geological data and fracture technology, a well 3D force field model technology can be made. This method is advanced and practicable, which can be applied in Daqing oil field with similary geological condition.
Keywords/Search Tags:low permeability reservoir, rock mechanics parameters, stress, well fracturing, created fracture, 3D-modling
PDF Full Text Request
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