EXPRESS METHOD TO DETERMINE CHARACTERISTICS OF BOTTOMHOLE ZONE IN STRIPPED WELLS USED FOR WELL COMPLETION AND SYSTEM FOR ITS IMPLEMENTATION Russian patent published in 2015 - IPC E21B47/10 

FIELD: oil and gas industry.

SUBSTANCE: level build-up curve is measured. The following parameters of the well are measured: density of fluid received during withdrawal during completion cycle (ρ, kg/cm³); viscosity of fluid received during withdrawal during completion cycle (µ, cP); oil-filled thickness (h, cm); final elevation of fluid pumping cycle (H_K, m); level elevation at level recovery in an hour (H₁, m); initial elevation of the next completion cycle (H_H, m); level recovery time (t, h); volume of fluid received at pumping during the last completion cycle (V₁, m³); permeability of the remote formation zone (k, D). Skin factor is calculated on the basis of the above measured parameters. When skin factor value is positive then well completion is suspended and decision is taken to stop usage of this well treatment at other facilities having identical characteristic of the reservoir; when skin factor value is negative then well completion is continued, the well is introduced into operation and decision is taken on further usage of this well treatment at other facilities having identical characteristic of the reservoir. The system comprises tools to reduce pressure in the well, instruments to measure the above parameters, tool for decision making on suspension or continuation of the well completion.

EFFECT: potential performance of the well on-line testing with simultaneous stage of its completion and reduced costs for well completion due to reduced period of completion.

9 cl, 7 dwg