FIELD: chemistry.
SUBSTANCE: invention relates to oil and gas industry. The bottom hole acidising composition contains, wt %: an aqueous acid solution 100; a mixture of quaternary organic ammonium compounds and surfactants 0.2-1.5; a solution of nonionic polyglycol in a solvent 0.2-0.5; a composition which includes 2-hydroxyethane-1-thiol and 25% ammonia solution 0.1-0.6. The aqueous acid solution according to the first version contains, wt %: hydrochloric acid 23-28; hydrofluoric acid 3-5; oxyethylene diphosphonic acid 0.5-0.7; water - the balance. The aqueous acid solution according to the second version contains, wt %: synthetic hydrochloric acid 12-32; oxyethylene diphosphonic acid 0.5-0.7; water - the balance.
EFFECT: high rate of dissolution and removal of salt deposits, preventing formation of low-solubility emulsions in the formation, reduced corrosion of underground equipment.
2 cl, 1 dwg, 2 ex
| Title | Year | Author | Number |
|---|---|---|---|
| ACIDIC COMPOSITION FOR TREATING FACE-ADJACENT BED SECTION | 2002 |
|
RU2235871C2 |
| ACIDIC SURFACTANT COMPOUND FOR PROCESSING FACE-ADJACENT ZONE | 2004 |
|
RU2249101C1 |
| ACIDISING COMPOSITION FOR BOTTOMHOLE FORMATION ZONE | 2013 |
|
RU2523276C1 |
| ACID SURFACE-ACTIVE COMPOSITION FOR TREATING BOTTOM-HOLE ZONE OF OIL AND GAS WELLS | 2015 |
|
RU2643050C2 |
| METHOD OF TREATMENT OF BOTTOM-HOLE ZONE WITH CHEMICAL REAGENT | 2000 |
|
RU2181832C2 |
| REAGENT COMPOSITION FOR DESTRUCTING CALCIUM CARBONATE DEPOSITION IN GAS BOREHOLES OF UNDERGROUND GAS STORAGE FACILITIES | 2020 |
|
RU2759614C1 |
| REAGENT FOR TREATMENT OF BOTTOMHOLE OIL FORMATION ZONE AND A PROCESS OF TREATING BOTTOMHOLE OIL FORMATION ZONE | 2006 |
|
RU2319726C1 |
| OIL FORMATION BOTTOMHOLE ZONE TREATMENT METHOD | 2007 |
|
RU2346153C2 |
| REAGENT COMPOSITION FOR DISSOLVING CARBONATE COLMATANT | 2019 |
|
RU2717850C1 |
| ACID COMPOSITION FOR TREATMENT OF BOREHOLE ZONE OF CARBONATE FORMATION | 2024 |
|
RU2824107C1 |
