Perm Journal of Petroleum and Mining Engineering (Sep 2016)
Analysis of the results of surveying and geodetic observations on geodynamic testing ground South-Petiegskoie field
Abstract
Research and practical experience of operating oil and gas fields shows that the production of hydrocarbons produces a powerful anthropogenic impact on the geological environment, which leads to disruption of the stress-strain state of the field`s subsurface array. It is not seldom accompanied by well accidents, cross-flows, aquifers pollution, can create conditions for settling the Earth's surface to a subsequent breach of stability and operational reliability of the oil and gas technological arrangement. In order to ensure industrial safety of oil and gas facilities in the South Petiegskoie field a geodynamic testing ground was created for a long-term surveying and geodetic observations and multiple repeated observations of contemporary deformation processes. The results of the third cycle of high-precision geodetic measurements obtained by geometric leveling of the class II, for the period 2014-2016 years, revealed that a greater number of observation points of the geodynamic testing ground heights gained significant negative values. This indicates a stable process of Earth's surface subsidence over the undermined territories mainly in the western part of the field, in the zone of maximum fluid and oil production. A geodynamic risk zone was revealed in the region of the well pad №1. Analysis and interpretation of geodynamic monitoring results (leveling of the class II, satellite observations, high-precision gravimetry), operating field development parameters (anthropogenic impact) and specificity of the natural geological and tectonic conditions allowed to determine that the condition for the formation of vertical and horizontal ground deformation was natural and man-made factor. The correlation between the formation of the Earth's surface subsidence`s trough and density characteristic`s dynamics, accumulated oil production, reservoir pressures falling was revealed. Recommendations for the further conducting of geodynamic monitoring of the South Petiegskoie oil field were given.
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