METHOD OF FLUID PULSE INJECTION INTO FORMATION Russian patent published in 2002 - IPC

FIELD: oil producing industry; applicable in increase of fluid injection efficiency into injection wells. SUBSTANCE: method includes excitation of low-frequency fluctuations of hydrodynamic pressure in injection wells during fluid injection through tubing string to under-packer zone separated from other part of well by packer. Included into lower part of tubing string are pipes with diameter smaller than that in remaining parts of tubing string. Parameters of tubing string and under-packer zone are selected on bases of conditions determined by mathematical expression. Included into upper part of tubing string are pipes of large diameter and total length equaling one fourth of length of excited wave. Parameters of tubing string and well depth are matched in certain manner. Distance from wellhead to upper end of small diameter pipes is selected multiple to length of half-wave excited in fluid inside tubing string. EFFECT: higher injectivity of injection wells and equalized injectivity profile. 3 cl, 1 dwg