Compound acidifying liquid containing nitric acid and boratofluroic acid and its use method

A technology of fluoboric acid and acidizing fluid, which is applied in the direction of earthwork drilling, mining fluid, wellbore/well components, etc. It can solve the problems of poor plugging removal effect, achieve the effects of preventing corrosion, ensuring construction safety, and excellent corrosion inhibition performance
CN1528854AInactive Publication Date: 2004-09-15LIDA OIL FIELD CHEM REAGENT WORKS SAERTU DISTRICT DAQING CITY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
LIDA OIL FIELD CHEM REAGENT WORKS SAERTU DISTRICT DAQING CITY
Publication Date
2004-09-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention is a kind of compound acidification liquid which contains hydrogen nitrate, fluoboric acid and the manufacturing method, it solves the problem that the blocking effect to formation which has large quantity of clay and low temperature. The character lies in: the compound acidification liquid includes hydrogen nitrate, fluoboric acid and acidification inhibitor and whose content is 2%-25%, 1%-15% and 0.5%-5%, the acidification inhibitor is made up of nitrogen compound, potentiating agent, surface activating agent and solvent waterless alcohol; when using the acidification liquid to be inserted into the formation, the usage is 1-6 m3 in each meter, the time in formation can exist for 4-12 hours, the reacted acidification liquid residue can return to the ground.
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Description

Technical field:

[0001] The invention relates to an oilfield chemical agent used in the technical field of chemical plugging removal for oilfield water injection wells, and belongs to a compound acidizing liquid containing nitric acid and fluoboric acid and a method for using the same. Background technique:

[0002] In the process of petroleum development, acidizing formation is an important measure to increase production and injection in the downhole operation of water injection wells. The acidizing fluid used in the acidizing process contains a certain concentration of acid and corrosion inhibitor. In actual work, the most commonly used acidizing solution is to prepare The acids used include hydrochloric acid, hydrofluoric acid, acetic acid, etc. The most commonly used acidizing processes are hydrochloric acid acidizing process and soil acid (a mixture of hydrochloric acid and hydrofluoric acid) acidizing process. When using conventional hydrochloric acid or soil acid for ...

Claims

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