FIELD: oil and gas production.
SUBSTANCE: here is disclosed composition for insulation of thief zones consisting of two reagents. As one of reagents, there is used bentonite-chalk solution containing bentonite clay powder, industrial chalk, sodium chloride and water. As another reagent, there is used 54.52-54.56% water solution of poly-oxy-chloride of aluminium where bentonite-chalk solution additionally contains starch and ferro-chromium-lignosulphonate at the following ratio of components, wt %: bentonite clay powder 8.00-9.00, industrial chalk 25.00-28.10, sodium chloride 15.10-15.50, starch 0.50-0.58, ferro-chromium-lignosulphonate 0.78-0.90, water - the rest. Also, ratio of bentonite-chalk solution and water solution of poly-oxy-chloride of aluminium is 4.0-10.0:1 correspondingly.
EFFECT: increased plastic strength and efficiency of insulation of thief zones at higher temperature.
2 ex, 1 tbl
| Title | Year | Author | Number |
|---|---|---|---|
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|
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| DRILLING FLUID FOR INJECTION AND REPAIR OF WELLS | 2001 |
|
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| METHOD FOR BLOCKING LOST-CIRCULATION FORMATION | 0 |
|
SU1802084A1 |
