METHOD FOR CONTROLLING EXTRACTION OF GAS DEPOSIT Russian patent published in 2007 - IPC E21B47/00 E21B43/00 

FIELD: methods for controlling extraction of gas deposits with usage of exploration geophysics methods, in particular, gravitational exploration.

SUBSTANCE: in accordance to the invention, repeated gravimetric observations and measurements of pressures in examination wells are combined in time. For each separate part of deposit, a graph of time dependence of values of gravity force on changes of formation pressure is built, normalized by ultra-compression coefficient and by value of absolute formation temperature. In case of rectilinear appearance of graph, gas mode of section extraction is identified, in case of disruption of linearity - mode change is identified. To determine degree of section processing, rectilinear graph is extrapolated to a point, in which pressure drop reaches value of original pressure in the formation. Value of maximal gravity force increment for this section corresponding to the point is determined. On basis of relation between current values of gravity force increment and maximal one, expressed in percents, level of extraction of resources is determined. To determine relation between resources of various deposit sections, angular coefficients are determined additionally for rectilinear graphs of dependence of gravity force changes on changes of normalized values of formation pressure, built for various sections, and on basis of ratio of angular coefficients, relation of gas volumes is estimated.

EFFECT: increased efficiency of gas deposit extraction control due to reduced ambiguousness of mode monitoring and of extraction degree evaluation of its various sections.

2 cl, 2 dwg