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

Inactive Publication Date: 2004-09-15
LIDA OIL FIELD CHEM REAGENT WORKS SAERTU DISTRICT DAQING CITY
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] In order to overcome the shortcomings of existing acidizing fluids that have poor plugging removal effects on formations with high clay content and low temperature, the present invention provides a composite acidizing fluid containing nitric acid and fluoboric acid and its application method. Blockage near the well, especially for formations with high clay content and low temperature, the plugging effect is more obvious

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1. A water injection well in the No. 1 mine of the No. 3 Oil Production Plant in Daqing. The well depth of the sandstone oil layer is 1215 meters, the formation temperature is 50° C., the quartz content is 75%, the shale content is 8%, and the feldspar content is 17%. The effective thickness of the perforation is 1.6 meters, and the water absorption is 1 meter under the water injection pressure of 15.5 MPa 3 / day, less than 30 meters 3 / Day of dispensing requirements. After analysis, the decline in water injection capacity was due to mixed clogging caused by metabolites of sulfate-reducing bacteria and clay swelling. Use scheme 1 in the above table to carry out acidification and deblocking. The amount of compound acidizing fluid per meter of formation is 4 meters 3 , with an average displacement of 0.4 m 3 / min, the replacement fluid is water. The residence time of the acid solution in the formation is 6 hours, and the acidified residual liquid is directl...

Embodiment 2

[0033] Example 2. A water injection well in the No. 1 mine of the No. 3 Oil Production Plant in Daqing. The depth of the sandstone reservoir is 985 meters, the formation temperature is 40° C., the content of quartz is 75%, the content of shale is 5%, and the content of feldspar is 20%. The effective thickness of the perforation is 5 meters, and the water absorption is 5 meters under the water injection pressure of 13.7MPa 3 / day, while the allocation requirement is 80 meters 3 / day. After analysis, the main reason for the decline of water injection capacity is the metabolites of sulfate-reducing bacteria, and the migration of clay particles is the secondary reason. Use scheme 2 in the above table to carry out acidification and deblocking. The amount of compound acidizing fluid per meter of formation is 2 meters 3 , with an average displacement of 0.4 m 3 / Minute. The acid liquid stays in the formation for 8 hours, and after the well is opened and blown out, it is discharg...

Embodiment 3

[0034] Example 3, a water injection well in the No. 1 mine of the No. 3 Oil Production Plant in Daqing, the depth of the sandstone reservoir is 1545 meters, the formation temperature is 55°C, the content of quartz is 55%, the content of mud is 20%, the content of feldspar is 20%, and the content of carbonate is 5%. . The effective thickness of the perforation is 12 meters, and the water absorption is only 5 meters under the water injection pressure of 15.2MPa 3 / day, while the allocation requirement is 30 meters 3 / day. After analysis, the main reason for the decline of water injection capacity is the migration and swelling of clay particles, and the scaling and bacterial metabolites are the secondary reasons. Use the acidizing solution of Scheme 2 in the above table to get rid of the blockage. The amount of compound acidizing fluid per meter of formation is 6 meters 3 , use water as a replacement solution. During construction, the average displacement is 0.35 meters 3 / ...

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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.

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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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/22
Inventor 孟祥文吴政义明成顺袁志宏徐彦平苏延昌
Owner LIDA OIL FIELD CHEM REAGENT WORKS SAERTU DISTRICT DAQING CITY
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