METHOD FOR AUTOMATIC MONITORING OF GAS AND GAS-CONDENSATE WELLS IN FIELDS IN EXTREME NORTH Russian patent published in 2018 - IPC E21B49/00 G01N15/08 G06G7/48 

FIELD: oil and gas industry.

SUBSTANCE: based on standard gas dynamic tests, the filtration resistance coefficients of gas inflow equation to the well bottom are determined and said coefficients are compared with values determined by calculation based on sector model of cluster of wells build according to geophysical research data and laboratory investigation of the core, and if the coefficients do not match, filter capacitance properties of the sector model of cluster of wells are clarified using actual data of gas flow to the well bottom that obtained from results of gas dynamic tests to achieve matching of calculated and actual coefficients of gas inflow equation to the well bottom and after this, using filter capacitance properties the radius of drainage of each well cluster is determined and grading of wells is performed by degree of power contours application, the well having maximum degree of drainage areas with rest cluster of wells is defined, after that by technological processes automatic control system of complex/preliminary gas preparation plant, said well is stopped by telemechanic systems for clusters of wells, and from this moment, by the telemechanic systems for clusters of wells, the technological processes automatic control system of complex/preliminary gas preparation plant registers simultaneously with specified discreteness the change of bottom-hole pressure by direct measurement of bottom-hole pressure or by calculation method that is determined from the measured annulus pressure at the wellhead of all wells of the cluster until its full stabilization, while the rest wells connected to gas gathering lines by the technological processes automatic control system of complex/preliminary gas preparation plant get simultaneously disconnected therefrom by the means of telemechanic systems for clusters of wells to avoid distortion of measurement results due to their communication through the gas gathering line. In this case, the change of bottom-hole pressure of the technological processes automatic control system of complex/preliminary gas preparation plant is registered by means of telemechanic systems for clusters of wells by synchronous measurement of pressure recovery curves on all wells with preset interval of discreteness to input in its database for subsequent comparison and analysis of difference in behaviour of wells, as well as use of data to clarify the model of filed development, after that an order for launching the sequence of wells of clusters for putting in operation and individual time intervals between the outlets of wells for putting the cluster in specified mode of operation with consideration of all previous test results after the field was put in operation are set. The technological processes automatic control system of complex/preliminary gas preparation plant performs start-up of wells in specified sequence and carries out synchronous measurement of change curves of annulus pressure at the wellhead of all wells of cluster and their well flow rate by means of telemechanic systems for clusters of wells, and inputs data in its database for subsequent analysis of wells operation and complex analysis of gas-bearing formation operation with determination of its parameters by results of stopping-starting the cluster of gas wells for selecting modes of its optimal operation before the next tests. After that, with the use of cluster sector model on the basis of stabilization data of well flow rate and bottom-hole pressures of disturbing wells and data of formation pressure stabilization in the zone of reactive wells, equivalent permeability of formation in inter-well space is corrected.

EFFECT: increased efficiency when collecting information on status of field development and accuracy of well cluster monitoring in real time scale at gas and gas-condensate fields.

3 cl, 3 dwg, 1 tbl