A METHOD OF DEVELOPMENT OF OIL POOL WITH LOW-PERMEABILITY RESERVOIRS Russian patent published in 2003 - IPC

FIELD: development of oil deposits, particularly, development of oil pools with low- permeability reservoirs. SUBSTANCE: method includes drilling of producing and injection wells, injection of water into formation for displacement of oil to producing wells and performance of hydraulic fracturing of formation. Producing and injection wells are drilled with horizontal wellbores parallel to one another in plan by intersecting of all low-permeability formations from roof to bottom of oil pool. Drilled in structure crest are vertical wells along revealed or supposed occurrence of natural fractures with location of bottomholes of these wells on extensions of extrapolated straight lines with respect to horizontal wellbores of injection wells. After that, hydraulic fracturing of formation is accomplished from these wells. Water is injected into vertical wells in which hydraulic fracturing of formation is effected, and into horizontal injection wells. Injected water contains chemical reagents preventing swelling of argillaceous particles and interlayers, and reagents for equalizing of injectivity profile. Which are introduced into injected water after 50-80% water cutting of recovered products. EFFECT: higher efficiency of method in case of layer heterogeneity of formations. 3 cl, 2 dwg