FIELD: oil and gas production.
SUBSTANCE: object of invention is chemically affecting bottom zone of formation to prevent differential stickings during boring wells. Composition for unclaying of bottom zone of formation comprises 5-50% aqueous solution of ammonium-containing substance containing 5.5-15% hydrochloric acid and additionally carboxylic acid and/or derivatives thereof in amounts 0.01 to 10%.
EFFECT: increased unclaying efficiency due to destruction of clay particles contained in porous space of formation at temperatures below 50оС and lowered corrosive activity of hydrochloric acid.
3 dwg
| Title | Year | Author | Number |
|---|---|---|---|
| METHOD AND COMPOSITION FOR CLAY REMOVING FROM BOTTOMHOLE FORMATION ZONE | 2003 |
|
RU2262594C2 |
| COMPOSITION FOR CLAY CAKE REMOVAL FROM FACE ZONE OF LOW-PERMEABILITY TERRIGENOUS SEAM | 2013 |
|
RU2539058C1 |
| METHOD FOR DECLAYING THE BOTTOMHOLE FORMATION ZONE | 0 |
|
SU1792483A3 |
| COMPOSITION FOR REDUCING CLAY CONSTITUENT OF CRITICAL AREA OF FORMATION | 2004 |
|
RU2257468C1 |
| COMPOSITION FOR UNCLAYING OF FORMATION BOTTOM ZONE (VERSIONS) | 2000 |
|
RU2174594C1 |
| ACID COMPOSITION FOR CHEMICAL TREATMENT AND FILTER CAKE REMOVAL OF WELL BORE ZONE OF RESERVOIR | 2018 |
|
RU2677525C1 |
| HYDROCHLORIC ACID COMPOSITION FOR REMOVING FILTER CAKE FROM BOTTOMHOLE FORMATION ZONE | 2009 |
|
RU2389750C1 |
| HYDROCHLORIC ACID COMPOSITION FOR TREATMENT AND CLAY CAKE REMOVAL OF BOTTOMHOLE FORMATION ZONE | 2018 |
|
RU2704167C1 |
| REAGENT FOR DESTRUCTION OF SEDIMENTATING CLAYEY FORMATIONS IN BOTTOM-HOLE ZONE OF BED AFTER DRILLING OR OVERHAUL OF WELL | 1997 |
|
RU2124122C1 |
| COMPOSITION FOR DESTRUCTION OF ORGANOPHYLIC CLAYISH FORMATIONS, MUDDING BOTTOMHOLE ZONE OF RESERVOIR OF UNDERGROUND GAS STORAGE | 2007 |
|
RU2360941C1 |
