METHOD TO ASSESS IMPACT OF GEODYNAMIC FACTORS AT SAFETY OF UNDERGROUND GAS STORAGE OPERATION IN POROUS BED Russian patent published in 2011 - IPC B65G5/00 G01V11/00 E21B47/00 

FIELD: measurement equipment.

SUBSTANCE: invention relates to an underground gas storage and is designed to determine impact of various natural-anthropogenic geodynamic processes at safety of an underground gas storage (UGS). The method includes development of a geodynamic polygon and execution of a comprehensive geodynamic monitoring (CGDM) on it, building a map following the CGDM results and forecasting emergency geodynamic events. The comprehensive geodynamic monitoring is executed both at regional and local stages in monitoring units - aerospace, deformation, geophysical, hydrogeological and fluid-dynamic ones, with application of various space and time detail of measurements. At the regional stage, site research is carried out within the geodynamic polygon in monitoring units - aerospace, deformation, geophysical ones. At the local stage of CGDM, well studies are carried out in monitoring units - hydrogeological, fluid-dynamic and geophysical ones. A refined geodynamic model is created. Classification of criterial indices is developed for each monitoring unit to assess a geodynamic risk, to assign a five-point grading at the regional stage, a three-point grading at the local stage, according to the level of the geodynamic danger. Indices calculated for each monitoring unit are compared with criterial indices, intensity of hazardous geodynamic and anthropogenic-induced processes expression is assessed in all monitoring units, then a single total coefficient of UGS geodynamic condition is calculated using the formula. It is compared with a previously calculated criterial coefficient for each level of geodynamic hazard, a level of geodynamic hazard of UGS is defined, and a final map of area ranging according to extent of geodynamic risk is built.

EFFECT: improved reliability and safety of UGS operation.

3 dwg, 4 tbl