Oil and water well polyacid blocking remover

A technology of blocking remover and polyacid, which is applied in drilling compositions, chemical instruments and methods, etc., can solve the problems of low corrosion rate of acid plugging remover, pollution and blockage in low permeability reservoirs, and save the operation scale. , low cost, easy flowback effect
CN105482801AInactive Publication Date: 2016-04-13CHINA NAT OFFSHORE OIL CORP +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA NAT OFFSHORE OIL CORP
Publication Date
2016-04-13
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to an oil and water well polyacid blocking remover. The blocking remover comprises 10-15% of hydrochloric acid, 6-8% of fluoroboric acid, 12-15% of modified silicic acid, 1-2% of anti-swelling agent, 1-2% of an iron ion stabilizer, 1-2% of a demulsifying cleanup additive, 1-2% of a water damage treatment agent, 2-4% of a corrosion inhibitor, 6-8% of a precipitation inhibitor, and the balance of water. Inorganic acids in the blocking remover are hydrochloric acid and fluoroboric acid, and hydrochloric acid can corrode the calcareous components of reservoir; and fluoroboric acid can corrode solid phase components, and has a loose sandstone bonding effect. An organic acid in the blocking remover is modified silicic acid, and can solve organic obstruction in a drilling fluid. The blocking remover can solve the problems of loose sandstone reservoir mud and drilling fluid pollution and obstruction and low corrosion rate of low-permeability reservoir acid solution blocking removers of present oil wells, and also has a low skeleton corrosion effect.
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Description

technical field

[0001] The invention belongs to the technical field of chemical production increase and injection increase in oil field development, and relates to a multi-acid blocking removal agent for oil and water wells. Background technique

[0002] Acidizing of oil and water wells is an effective technical means to increase production and injection in oilfields, but at present, the domestic conventional single acid system is not effective in solving some comprehensive damages. , Solve comprehensive damage, easy flowback, save operation scale and other advantages.

[0003] However, there are still many problems in the use of multiple compound acid liquid systems. For example, the composite system composed of inorganic acids has high acid strength, is easy to damage the reservoir framework, and has a high corrosion rate of steel, which is mainly aimed at low-permeability reservoirs; emulsified composite acids are likely to cause oil-water emulsification and difficult fl...

Claims

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