PROCEDURE FOR TRIAL HOLE TESTING Russian patent published in 2010 - IPC E21B49/00 

FIELD: oil and gas industry.

SUBSTANCE: invention refers to oil and gas producing industry, particularly to testing trial boreholes of hydrocarbon deposits of complex structure. During testing a trial borehole, a casing pipe is perforated, a production tree is installed, a long-length extreme line pipe is lowered to upper holes of a perforation interval and process fluid is replaced with water, while water is replaced with oil. As necessary level is dropped, the extreme line long-length pipe is lifted, inflow is initiated, and the bore hole is processed to a gas flare till stabilisation of wellhead parametres; further, there are lowered instruments for measurements of formation pressure and temperature, curve of pressure recovery is plotted, and depth and wellhead formation fluid is sampled. Upon this the extreme line long-length pipe is repeatedly lowered, the borehole is filled with water with successive replacement of water to process fluid and with installation of cement bridging; further, similar trial operations are performed at the overlying object. The borehole is abandoned upon testing all planned objects.

EFFECT: saving material and time expenditures at construction and test of trial borehole.

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