FIELD: oil and gas production. SUBSTANCE: invention relates to foaming compositions for killing wells in order to perform pullout of hole at abnormally low formation pressures. Composition consists of foam-former based on aqueous solution of lignosulfonate reagent (4-20%), hydrocarbon fluid as foam stabilizer (12-31%), 1:(0.5-2.0) mixture of crushed three-day barley germs with powdered lignosulfonate reagent selected from industrial-grade lignosulfonate, condensed sulfite-alcohol distillery dregs, ferrochrome-lignosulfonate, and lignase as solid phase (3-10%), and aqueous calcium chloride solution with density 1120-1280 kg/cu.m (the balance), said lignosulfonate reagent solution having concentration 1130 kg/cu.m and said lignosulfonate being selected from as above. EFFECT: increased multiplicity of foam with preserved stability, enhanced blocking properties, reduced filtration into formation due to accelerated creation of low-permeable filtration barrier, reduced natural permeability of producing formations after unblocking, and decreased well development time. 2 cl, 15 ex
Title | Year | Author | Number |
---|---|---|---|
FOAM-FORMING COMPOUND FOR SHUTTING WELLS | 2003 |
|
RU2245441C1 |
FOAM-FORMING COMPOSITION FOR PERFORATION OF PRODUCING STRATA | 2001 |
|
RU2209227C2 |
WELL KILLING FOAMING COMPOSITION | 2004 |
|
RU2266394C1 |
FOAMING WELL-KILLING COMPOSITION | 1998 |
|
RU2152973C2 |
FOAM-EMULSION COMPOSITION FOR WELL KILLING | 2001 |
|
RU2205943C1 |
METHOD OF STABILIZATION OF BOTTOM-HOLE PRODUCING FORMATION ZONES | 1999 |
|
RU2172811C2 |
METHOD OF WELL STAGE CEMENTING UNDER CONDITIONS OF ABNORMALLY LOW FORMATION PRESSURES IN LOST CIRCULATION ZONE | 2000 |
|
RU2188302C2 |
TECHNOLOGY TO CLEAR HORIZONTAL WELL FROM SAND PLUG IN PROCESS OF OVERHAUL | 1999 |
|
RU2165007C2 |
HEAVY DRILLING FLUID | 2006 |
|
RU2315076C1 |
COMPOUND FOR INSULATION OF INFLOW OF STRATAL WATER | 1999 |
|
RU2164598C2 |
Authors
Dates
2003-07-10—Published
2001-09-18—Filed