FIELD: oil and gas production.
SUBSTANCE: invention relates to reduced-density water-based drilling fluids for drilling and completing wells. Drilling fluid composition according to invention contains, wt %: microbial xanthane biopolymer 0.5-2.0, modified starch 0.2-2.5, lignosulfonate reagent 0.2-1.5, sodium carbonate 0-0.4, calcium oxide 0-0.2, magnesium oxide 0-0.2, potassium chloride 0-5.0, protein hydrolyzate (calculated as solids) 0.1-1.0, biocide 0-0.1, and water - the rest. Composition is used to prepare drilling fluid containing high-stability microbubble gaseous colloidal inclusions (aphronics) providing trouble-free making and completion of wells without loss and absorption of drilling fluid while simultaneously preserving reservoir properties of drilled productive horizons.
EFFECT: achieved creation of effective, accessible, economically profitable and environmentally friendly drilling fluid composition.
4 tbl, 3 ex
| Title | Year | Author | Number |
|---|---|---|---|
| TECHNOLOGICAL LIQUID FOR DAMPING OIL AND GAS HOLE AND METHOD FOR ITS PREPARING | 2007 |
|
RU2322472C1 |
| METHOD OF INCREASING OIL RECOVERY OF FORMATIONS | 2000 |
|
RU2168616C1 |
| OIL FORMATION RECOVERY INCREASING COMPOSITION | 2001 |
|
RU2180396C1 |
| METHOD OF DRILLING OF WELLS COMPLICATED BY ABSORBING HORIZONS | 2014 |
|
RU2563856C2 |
| APHRON-CONTAINING PROCESS FLUID | 2021 |
|
RU2776817C1 |
| COMPOSITION FOR INCREASING OIL RECOVERY OF FORMATION | 2003 |
|
RU2242598C1 |
| WELL KILLING FOAMING COMPOSITION | 2004 |
|
RU2266394C1 |
| GEL-FORMING COMPOSITION FOR CONTROL OF FORMATION PERMEABILITY | 2001 |
|
RU2181427C1 |
| CLAY-FREE DRILLING FLUID | 2007 |
|
RU2348670C1 |
| DRY MIXTURE FOR THE PREPARATION OF WELL KILLING FLUID | 2020 |
|
RU2753299C1 |
