METHOD FOR GROUP RESEARCH OF CLUSTER GAS AND GAS-CONDENSATE WELLS IN STATIONARY FILTRATION MODES Russian patent published in 2008 - IPC E21B47/10 E21B43/34 

FIELD: oil and gas industry.

SUBSTANCE: invention can be used during gas-dynamic, geophysical and special researches of gas and gas-condensate wells, mostly for researching the wells grouped in operational clusters. Method includes the well's stop, measurement of static wellhead pressure and formation pressure, well's discharge into gas-collecting header and measurement of gas flow rate in several operating modes by means of variable pressure drop on the orifice, measurement of flowing tubing head pressure and bottom hole pressure in every mode, establishment of pressure stabilisation curve and pressure-recovery curve, gas temperature measurement on the well's bottom and head in every mode and determination of gas flow coefficients A and B. In this case the wells being researched are divided into pairs having maximum degree of external boundary superimposition, and each of the well's pairs is referred to different groups. Two groups of wells consisting of similar pairs are researched simultaneously. One group is researched in reverse modes with flow rate decrease up to the full stop, and the other one is researched in direct modes with flow rate increase up to the maximum allowable value. Then the flow rate direction in both groups is changed to the opposite one. At that, total flow rate of each pair of wells and total cluster flow rate are controlled and kept close to constant values for each pair of wells with accuracy of up to 30%, and for the tail - with accuracy of up to 10%.

EFFECT: increasing the accuracy of data obtained, and reducing the research period of all cluster wells.