FIELD: oil and gas production.
SUBSTANCE: invention relates to oil recovery involving use of aqueous hydrochloric acid-based chemicals serving for integrated hydrochloric acid action on bottomhole oil formation zone in order to intensify oil and gas inflow therefrom, which invention being, in particular, designed for use in cases necessitating increase of oil recovery from low-permeable carbonate formations saturated with extra-heavy oil. -based composition contains 5-7% of aqueous acetic acid solution, 35-40% of by-product of sulfuric acid-catalyzed isobutylene/formaldehyde condensation taking part in production of isoprene, notably dimethyl-m-dioxan, and 20% aqueous hydrochloric acid to 100%.
EFFECT: increased bottomhole formation zone treatment efficiency due to stability of composition and depth, to which composition penetrates into carbonate formation, and also augmented choice of acid reagents for treatment of low-permeable formations.
4 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| COMPOSITION FOR TREATING WELL BOTTOM ZONE OF CARBONATE FORMATION WELLS | 2004 |
|
RU2269563C1 |
| MIXTURE FOR TREATING CARBONATE LAYER OF WELLBORE AREA | 2007 |
|
RU2347799C1 |
| METHOD OF PROCESSING FORMATION BOTTOMHOLE ZONE | 2007 |
|
RU2352773C1 |
| METHOD OF BOTTOMHOLE ACIDISING | 2008 |
|
RU2395682C2 |
| METHOD FOR PROCESSING BOTTOMHOLE FORMATION ZONE | 2014 |
|
RU2583104C1 |
| COMPOSITION FOR ACID TREATMENT OF BOTTOMHOLE ZONE OF CARBONATE RESERVOIRS | 2023 |
|
RU2810383C1 |
| SURFACE-ACTIVE ACID COMPOSITION FOR TREATMENT OF CARBONATE BASINS | 2012 |
|
RU2494136C1 |
| ACIDISING COMPOSITION FOR BOTTOMHOLE FORMATION ZONE | 2013 |
|
RU2523276C1 |
| ACIDIC SURFACTANT COMPOUND FOR PROCESSING FACE-ADJACENT ZONE | 2004 |
|
RU2249101C1 |
| ACID SURFACE-ACTIVE COMPOSITION FOR TREATING BOTTOM-HOLE ZONE OF OIL AND GAS WELLS | 2015 |
|
RU2643050C2 |
