| 摘要 |
FIELD: oil and gas industry.SUBSTANCE: invention relates to oil and gas industry, namely to method of tightness testing of the cased injection well. Methods includes: determination of actual pressure difference on the packer ?C=P-P-C+C-P-P, where Pand Pare measured wellhed pressure on injection to top and bottom reservoirs, respectively, Cand Pare pressure losses for friction during water movement via short and long strings. respectively, Pand Pare absolute errors of measurements by technical pressure gauge in short and long strings, respectively, atm. At that criterion of the tightness estimation is the pre-specified critical pressure difference ?C. System tightness is estimated by comparison of the actual pressure difference on packer ?Cand pre-specified critical pressure difference at |?C|>|?C| the system is tight. Method of the tightness testing of the injection well contains stages at which: pressure change is registered in well blocked by the packer, by wellhead pressure measuring at input to tubing string in top and bottom reservoirs, respectively. Data analysis is performed, and tightness is determined. At that preliminary current water flowrate via pipeline is measured Q. Tightness is estimated if the following condition is met:where ?Cand Qare measured current wellhead pressure difference and current water flowrate, respectively; ?Pand Qare actual measured current wellhead pressure difference and current water flowrate, respectively. If the condition is met the well is tight.EFFECT: decreased number of tightness tests in wells operated under process of simultaneous-separate injection.16 cl, 2 tbl, 2 dwg |
