FIELD: special-destination fluids in oil and gas production industry.
SUBSTANCE: invention relates to construction of wells and, more specifically, to clay-free drilling fluids used in drilling, completion, and thorough repairs of wells in the oil and gas fields as well as in underground gas storage facilities. Proposed drilling fluid contains 0.2-0.5% xanthine, 0.2-0.5% modified starch reagent, 4.2-9% sodium and/or potassium chloride, and balancing amount of ammoniated calcium nitrate solution plus (above 100%) 2.1-75% calcium chloride and water in amount corresponding to 10% of the volume of ammoniated calcium nitrate solution. Drilling fluid may further include weighting agent: sodium chloride or calcium carbonate.
EFFECT: improved quality and expanded technological possibilities of drilling fluid due to elevated stability of structural-mechanical characteristics thereof, raised upper limit of density values, and reduced alkalinity.
4 cl, 2 tbl
| Title | Year | Author | Number |
|---|---|---|---|
| POLYMER-BASED DRILLING MUD FOR WELL CONSTRUCTION | 2015 |
|
RU2601635C1 |
| BIOPOLYMER DRILLING MUD SBK-UNI-DRILL-PRO (HARD) | 2013 |
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|
RU2561634C2 |
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|
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|
SU1684308A1 |
| STRUCTURED FLUSH FLUID | 2022 |
|
RU2792473C1 |
| STRENGTHENED MINERALIZED BORING SOLUTION FOR THE OPENING OF PRODUCTIVE PLATES WITH ABNORMALLY HIGH PLASTIC PRESSURE | 2018 |
|
RU2683448C1 |
