FIELD: oil and gas industry.
SUBSTANCE: method of formation insulation with cement-silicate mud involves injection into a formation well bore zone of cement mud with hardener. Plugging is performed by cyclic successive-alternating injection into a well of sodium silicate solutions (mass fraction from 20 to 45%, silica module over 2.5) with wood dust filler (mass fraction not above 3%) and cement hydrated with water solution of sodium silicate (mass fraction not more than 5%) with ratio to cement equal to 0.5. At that, sodium silicate and cement solutions during pump-in are separated by buffer - fresh water in volume of 10 to 15% of volume of process pipes lowered into the well. Volume ratio of cement mud and sodium silicate solution is 0.3 to 0.7.
EFFECT: formation insulation quality improvement regardless of formation permeability degree and sizes of conducting channels, shortening of terms of drilling and servicing of difficult wells, increase of production of hydrocarbon stock.
1 dwg, 1 tbl
Title | Year | Author | Number |
---|---|---|---|
INSULATION METHOD OF WATER INFLUX AND WELL THIEF ZONE | 2008 |
|
RU2378490C1 |
ISOLATION METHOD OF WATER INFLUX TO WELL | 2010 |
|
RU2425957C1 |
METHOD OF WELL ABSORPTION ZONE ISOLATION | 2012 |
|
RU2504641C1 |
METHOD OF REPAIR-INSULATION WORKS IN OIL AND GAS WELL | 2019 |
|
RU2723416C1 |
RESTORING METHOD OF SEALING OF CASING STRINGS | 2011 |
|
RU2471963C1 |
WELL REPAIR METHOD | 2011 |
|
RU2483193C1 |
METHOD FOR DOING REPAIR-ISOLATION WORKS UNDER CONDITIONS OF INTENSE ABSORPTION | 2009 |
|
RU2405926C1 |
METHOD FOR RESTORING TIGHTNESS OF PRODUCTION STRINGS | 1997 |
|
RU2116432C1 |
METHOD FOR REPAIR AND INSULATION WORKS IN WELL | 2018 |
|
RU2684932C1 |
METHOD OF PHYSICAL ABANDONMENT OF WELLS | 2014 |
|
RU2576422C1 |
Authors
Dates
2014-06-10—Published
2012-11-28—Filed