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The Methods And Application Of Predicting Fracture Height Of Formation

Posted on:2013-03-15Degree:MasterType:Thesis
Country:ChinaCandidate:Z Y ChenFull Text:PDF
GTID:2230330374976550Subject:Earth Exploration and Information Technology
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In the development stage of oilfield, in order to obtain the economic benefits oil and gas as much as possible, people often do fracturing for low porosity and low permeability reservoir to increase yield. In the fracturing process, when the pump pressure is too low,it can not achieve the purpose of fracturing, otherwise, it may lead to the adjacent layer broken and cause the string groove thus to affect oil and gas production of the well, so we must analyze the rock physical properties of the low porosity and low permeability reservoir, so as to predict the hydraulic fracture height of the reservoir.Geostress and rock mechanics parameters has important significance on making perforating scheme, the3D fracturing simulation and engineering parameter optimization. Therefore, strengthening the research and application of Geostress profile is the basis of improving the success rate of fracturing construction, fracturing effect and technology level. Measuring Stress is not directly, and it can obtain single point depth data through the core and the field test, logging data in some ways can reflect the rock physical properties. The application of rock logging data, the elastic dynamics theory and the strength of the rock in theory can get access to the rock mechanics parameters related to the reservoir fracturing reconstruction, formation pore fluid pressure and the variation characteristics of fracture pressure with the depth changing. With elastic theory as a foundation, combined with acoustic logging data, the Geostress calculation model and calibration model are established, and then the principal stress value of target layer and interlayer, Poisson’s ratio, Yang’s modulus, and other fracture design sensitive parameters and continuous profile are provided; By applying the method of estimating the shear waves or Poisson’s ratio, and analyzing ground stress using the conventional logging data (no shear wave logging data), and then the single well ground stress profile defined can provide the basis for fracturing design and analysis after fracture. The specific construction method for target layer’s fracturing is a kind of stimulation measures.the best results of this process can not only make all targets open, but also not pressure surrounding rock, act in collusion with fluid properties or layer of different pressure system, and then reach the maximum depth of reasonable fracturing. Therefore, the design of the fracturing operation must have the prediction of the fracturing height. The vertical height of fracturing mainly depends on the construction stress, ground stress and rock mechanics properties. Well stability analysis just work on these parameters, so as to achieve the purpose of increasing yield. In order to effectively improve seepage condition of oil and gas reservior, provide a good seepage channel for fluid, lower flow resistance of the fluid and greatly improve the oil, gas, water wells in the liquid, gas production or water absorption capability. In view of the logging data of well shi002in Xinjiang province, the hydraulic fracture height prediction research has been put forward.The paper mainly includes the calculation of rock mechanics parameters, stress and formation fracture pressure, combined with hydraulic fracture height prediction,which are realized respectively under ROXAN model of Geoframe and Forward. The results show that the formation fracture pressure logging calculation method and fracture height prediction method are reasonable, the implement parameters provided for reservoir reconstruction are more reliable; Integrated using formation fracture pressure in well shi002of the region and fracture height prediction results optimized the testing formations, which obtained high yield of gas and achieved bigger economic benefits and better application effect.
Keywords/Search Tags:fracturing height, Geostress, rock mechanics parameters, fracturepressure, hydraulic fracture
PDF Full Text Request
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