METHOD FOR DEFINING WELL CHARACTERISTICS, FORMATION BOTTOM-HOLE ZONE Russian patent published in 2012 - IPC E21B47/10 E21B43/22 E21B43/27 

FIELD: oil and gas production.

SUBSTANCE: method for defining well characteristics, formation bottom-hole zone includes reagent pumping via tubing with closed tubular annulus, measurement of reagent flow rate at the well mouth and pumping pressure in bottom-hole zone. Measurement data is calculated for bottom-hole conditions. Accumulated flow rate and labour input per reagent flow unit in well bottom-hole zone is determined. These indices are used for definition of current formation conductivity change. Before reagent pumping fresh water is pumped into formation via tubing till well-head pressure reaches P_head=10 MPa with measurement of this pressure change in time and volume of pumped water. Their analysis is used to define initial conductivity of formation bottom-hole zone. After that there performed is an operation of bottom-hole treatment by reagent that is gassy fluid with water solution surfactant ML-81B or water solution of hydrochloric acid HCl. After that fresh water is pumped into formation similarly to the initial operation and final conductivity of formation bottom-hole zone is determined. After comparison of initial and final conductivity of bottom-hole zone there defined is a change of formation bottom-hole zone conductivities. If bottom-hole zone conductivity decreased or its increase is less than 10%, then additional treatment of bottom-hole zone is carried out by this or other reagent.

EFFECT: increase of efficiency of selection of the most effective process operation on improving formation bottom-hole zone conductivity depending upon the type of collector comprising it and simplification of defining well characteristics, formation bottom-hole zone process.

1 dwg, 3 tbl