FLUID FOR KILLING WELL DRILLED WITH DIFFERENTIAL PRESSURE TAPPING OF PRODUCING FORMATION AND METHOD OF KILLING WELL DRILLED WITH DIFFERENTIAL PRESSURE TAPPING OF PRODUCING FORMATION (VERSIONS) Russian patent published in 2003 - IPC

FIELD: well drilling and oil production, particularly, methods of killing the well drilled with differential pressure tapping of producing formation; applicable, for instance, before well logging, before lowering of bottomhole equipment, etc. SUBSTANCE: fluid for killing the well drilled with differential pressure tapping of producing formation is used in form of by-product of synthetic rubber production at stage of obtaining of dimethyl-dioxane. Method of killing the well drilled with differential-pressure tapping of producing formation includes injection into well of killing fluid in form of by-product of synthetic rubber production at stage of obtaining of dimethyl-dioxane in volume ensuring filling of wellbore, at least, 50m above roof of producing formation interval; subsequent forcing of killing fluid to equalize its level in pipe and annular spaces is carried out with crude oil involved in tapping of producing formation by drilling, with subsequent lifting of drilling tool to upper level of killing fluid and filling of remaining well volume with same oil up to natural static level. Forcing of killing fluid to equalize its level in pipe and annular space, with well hydrostatic pressure equaling the formation pressure may be carried out with heavy oil having density above 0.90 g/cu.cm, with subsequent lifting of drilling tool up to upper boundary of killing fluid column and filling with same oil of remaining well volume. Forcing of killing fluid to equalize its level in pipe and annular spaces, with formation pressure exceeding the well hydrostatic pressure is carried out by means of inverted emulsion in volume ensuring filling of wellbore, at least, 50m above level of killing fluid, with subsequent lifting of drilling tool up to upper level of inverted emulsion column, and filling of remaining well volume with washing fluid of rated density. Inverted emulsion has the following amounts of components, wt.%: summer diesel fuel 18.1-26.1; mineralized formation water with density 0f 1.17 g/cu.cm 69.1-77.2; amulsifier UKRINOL 1 or VNIINP-354 0.4; SMAD-1 3.8-3.9; bentonite 0.5. Washing fluid is used in form of formation water of rated density. EFFECT: full preservation of reservoir properties of producing formation in killing the well drilled with differential pressure tapping of producing formation with simultaneous increase of intensification of formation fluid inflow in completion of such wells. 6 cl, 1 tbl