DRY-ACID COMPOSITION FOR BOTTOMHOLE WELL ZONE TREATMENT AND SCALE REMOVAL Russian patent published in 2018 - IPC C09K8/52 C09K8/528 C09K8/54 C09K8/74

Abstract RU 2652047 C1

FIELD: oil and gas industry.

SUBSTANCE: invention relates to the oil and gas production industry and can be used in acid treatments of the bottomhole well zone, bed decomposition and scale removal. Dry acid composition for treating the bottomhole zone of wells and removal of scaling containing ammonium fluoride or ammonium bifluoride, sulfamic acid, phosphorus-containing complexone-oxyethylidenediphosphonic acid (OEDP), ammonium chloride, further comprising a water-soluble polymer-hydrolyzed polyacrylamide and corrosion inhibitor - ammonium rhodanate, with the following ratio, mass%: ammonium fluoride 33.3-39.4 or ammonium bifluoride 33.3-39.4, ammonium chloride 1.00-1.10, said phosphorus-containing complexone 0.10-0.11, said water-soluble polymer is 3.00-3.34, said corrosion inhibitor is 5.00-5.55, sulfamic acid - the rest.

EFFECT: technical result is an increase in the efficiency of acid treatment by optimizing the acid composition, improving its rheological properties and reducing corrosion activity.

1 cl, 1 dwg

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RU 2 652 047 C1

Authors

Lapshina Marina Vladimirovna

Dates

2018-04-24—Published

2016-12-01—Filed