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Research on In-Situ Stress Based on Optimum Technique and Bearing Law of Casing Pipe

Author: WangZhiGang
Tutor: ZuoXiangZuo
School: China University of Petroleum
Course: Mechanical Design and Theory
Keywords: Ground stress Multi-objective optimization Casing damage Non - uniform load Creep formation
CLC: P618.13
Type: PhD thesis
Year: 2009
Downloads: 236
Quote: 0
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Reservoir places stress on the formation of oil and gas resources, migration and reservoir direct control, but it is also a major factor in casing damage. Study reservoir characteristics of ground stress and casing damage mechanism important engineering role in guiding the oil field development. First, based on the multi-objective optimization techniques to establish the the back analysis mathematical model, the use of acoustic logging, hydraulic fracturing, fracture monitoring data to determine the size and orientation of the key wells at the point of ground stress, as a constraint on the L112 block and CHUNLIANG block oilfield GEOSTRESSES multi-objective optimization back analysis to obtain the distribution pattern of horizontal principal stress along the reservoir plane, L112 block and pure Liangyou Tian at different depths in the horizontal principal stress along the depth variation . Second, the proposed displacement back analysis method based on deformation data to determine casing external loads. Obtained by back analysis of the optimization of the partial displacement of the casing wall sleeve suffered internal pressure and external load size, providing the basis for the study of the casing in a non-uniform loads collapsing and casing damage prevention measures. Again, by large oilfield casing damage statistics, analysis of the main types of casing damage and causes the typical load using the finite element numerical simulation techniques to study the non-uniform stress on the sets of casing damage mechanism and the impact of the law; pipe strength, the results show that: evenly stress, regardless of the casing or cement ring, the effective stress and displacement distribution are subject to stress non-uniformity is anisotropic, and with the non-uniformity coefficient The increase in effective stress concentration factor increased in varying degrees. For N80 and P110 grade specifications casing, the application of numerical simulation methods to establish the the perforation parameters optimized design model, and obtained the law of perforating the casing strength, and to obtain a non-uniform under conditions of external pressure the perforated intervals the casing stress distribution and the different specifications casing in different internal and external pressure under stress distribution law. Finally, based on previous research, carried out research casing design method based on in situ stress equivalent failure load concept, and in accordance with the theory of elasticity, the establishment of a mechanical model of the casing in a non-uniform loads, The collapse strength formula of the ideal tube anti amended derived formula in line with the actual sleeve bearing feature.

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CLC: > Astronomy,Earth Sciences > Geology > Of ore deposits > Deposit classification > Fuel deposits > Oil, natural gas
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