METHOD OF MASSIVE DEPOSIT DEVELOPMENT Russian patent published in 2012 - IPC E21B43/20 

FIELD: oil and gas industry.

SUBSTANCE: during development producing and injection vertical wells and/or horizontal wells are drilled following a rare grid, a displacement agent is pumped via injection wells, and production is carried out via producing wells. Charts of structural and oil-saturated thicknesses are built, zones with oil-saturated thickness of more than seven metres are identified, producing wells are drilled with horizontal ending of one and/or two bottomholes. The main horizontal bore is drilled in a thickness making not more than 30% to the total oil-saturated thickness from the roof. Hydrodynamic tests are carried out, the bore is developed and put into operation, productivity is identified. The second lower horizontal or subhorizontal bore is drilled after hydrodynamic tests and short-term operation of the first bore, or the second bore is drilled immediately upon completion of drilling of the first one, besides, in both cases under the first one or with deviation by azimuth of not more than 10°, with a zenith angle of at least 60° and the distance from the first one, after it reaches 90°, along the vertical line of at least three metres, with installation of one or more sites in it to equip a controlled filter with length of at least 15 metres, providing for no overflows of fluid between bed zones upstream and downstream the site. The well is developed and put into operation, fluid, oil debit is measured, its productivity and extent of product watering is identified. If product watering is 85 percent and higher, a controlled filter is lowered to the installed site, and its lower fold is closed, and operation of the well with low watering of products continues.

EFFECT: fuller coverage of oil deposits in the crosshole space and along the section with development, increased service life of wells and oil recovery.

1 ex, 2 dwg