Full-Field Modeling and Analysis of Surface Deformations Induced by Gas Injections into Reservoirs

doi:10.11885/j.issn.1674-5086.2015.03.06.02

Abstract

Abstract: The simulation analysis of ground surface deformation caused by gas injection into reservoir can predict working hazards in the reservoir, provide design guidance of tiltmeter arrays for monitoring rock strata deformations, and calibrate current geological models.It is thus the basis for monitoring ground surface deformations in an effective manner, implementing history matching for practical processes, and inversions and predictions of deep-lying reservoirs.To provide an effective simulation analysis, we have developed a user-controllable large-scale gridding discretization method that automatically converts Eclipse reservoir models and extends them into FLAC^3D full-field geological models, and transforms Eclipse reservoir flow analyses into usable data for FLAC^3D rock mechanics analyses. Thus realizes one-way coupled reservoir simulation-geomechanical modelling. On this basis, we have simulated surface deformation in a large-scale saline aquifer CO₂ storage project that occur after gas injection. Highly accurate numerical computations are required for these studies as the rock mass deformations induced by permeation processes during reservoir injection are very minute. Here, we have demonstrated the causes and have provided solutions for special problems that are encountered during conventional simulation processes, such as limitations in their capacity for approximation. In addition, we have investigated the effect of the underlying stratum thickness of reservoirs in geological models on simulation accuracies.

Key words: reservoir gas injection processes, ground surface deformation monitoring, full field reservoir modelling, one-way coupling

CLC Number:

TB16

LI Hong, ZHENG Lina, LIU Jianjun. Full-Field Modeling and Analysis of Surface Deformations Induced by Gas Injections into Reservoirs[J]. 西南石油大学学报(自然科学版), 2017, 39(3): 147-157.

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URL: http://journal15.magtechjournal.com/Jwk_xnzk/EN/10.11885/j.issn.1674-5086.2015.03.06.02

http://journal15.magtechjournal.com/Jwk_xnzk/EN/Y2017/V39/I3/147

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