METHOD OF HYDRODYNAMIC RESEARCH FOR GAS-BEARING FORMATIONS WITHOUT GAS RELEASE TO SURFACE Russian patent published in 2014 - IPC E21B47/10 E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: method of hydrodynamic research for gas-bearing formations without gas release to the surface includes running in at the drill string of flow string of the testing equipment in the form of a formation tester with a packer and geophysical sensors to the preset research interval of the gas-bearing formation. The research interval is isolated by the packer upstream the gas-bearing formation. Influx mode and pressure recovery mode are created in sequence and the further interpretation of the received data is made. At that in process of the testing equipment running in to the drill or flow string the design quantity of at least two-component viscoelastic mixture with the target parameters of viscosity and elasticity is poured additionally; the mixture is made without a crosslinker and based on polyacrylamide and zeolite or mud powder; above the testing equipment assembly it creates a viscoelastic plug. The plug ensures creation of depression to the value not exceeding 10-20% of the expected formation pressure. Further the hydrodynamic research is made as per the drill stem test procedure.

EFFECT: improving accuracy and efficiency of the research.

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