Compound high-temperature acidizing corrosion inhibitor based on pyridine quaternary ammonium salt
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A technology of acidifying corrosion inhibitor and quaternary ammonium salt, applied in drilling compositions, chemical instruments and methods, wellbore/well components, etc., can solve the problems of downhole tubing tripping, no good corrosion inhibitor for corrosion protection, etc. , to achieve the effect of stable properties, improved acidizing construction quality, and high construction safety
Inactive Publication Date: 2017-12-29
CNPC BOHAI DRILLING ENG
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In the past, when high-temperature deep wells in some oil fields were acidified with concentrated hydrochloric acid, accide
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[0027] Example 1
[0028] A composite high-temperature acidification corrosion inhibitor based on pyridine quaternary ammonium salts, including 20 parts of corrosion inhibitor main agent, 1.0 part of potassium iodide, 0.5 part of antimony trioxide, 0.5 part of antimony trichloride, 0.5 part of antimony trichloride, 0.5 part of O-15, 0.5 parts of propynol, 1.0 parts of OP-10, 6.0 parts of triethanolamine, 1.0 parts of LAS, 7.0 parts of DMF, 7.0 parts of DMA, 55 parts of methanol. When in use, weigh the above components and mix them evenly before sending them to the construction site for use or storage for later use.
Example Embodiment
[0029] Example 2
[0030] A composite high-temperature acidification corrosion inhibitor based on pyridine quaternary ammonium salts, including 22 parts of corrosion inhibitor main agent, 1.5 parts of potassium iodide, 0.5 parts of antimony trioxide, 0.5 parts of antimony trichloride, and 0.2 parts of plain plus O-20 , 0.8 parts of propynol, 0.2 parts of OP-10, 2.5 parts of triethanolamine, 0.8 parts of LAS, 3.0 parts of DMF, 3.0 parts of DMA, 64 parts of methanol. When in use, weigh the above components and mix them evenly before sending them to the construction site for use or storage for later use.
Example Embodiment
[0031] Example 3
[0032] A composite high-temperature acidification corrosion inhibitor based on pyridine quaternary ammonium salt, including 25 parts of corrosion inhibitor main agent, 1.2 parts of potassium iodide, 0.6 parts of antimony trioxide, 0.7 parts of antimony trichloride, and 0.5 parts of flat plus O-25 , 1.0 parts propynol, 0.5 parts OP-10, 3.5 parts triethanolamine, 1.0 parts LAS, 2.0 parts DMF, 5.0 parts DMA, 59 parts methanol. When in use, weigh the above components and mix them evenly before sending them to the construction site for use or storage for later use.
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Abstract
The invention discloses a compound high-temperature acidizing corrosion inhibitor based on pyridine quaternary ammonium salt. The compound high-temperature acidizing corrosion inhibitor is prepared from components in parts by weight as follows: 20-30 parts of a corrosion inhibitor main agent, 2.0-2.5 parts of a synergist, 0.2-1.0 part of a dispersing agent, 0.5-1.0 part of propargyl alcohol, 0.2-1 part of an emulsifier, 2.5-6.0 parts of triethanolamine, 0.8-1.0 part of a surfactant and 60-70 parts of a solvent, wherein the corrosion inhibitor main agent is the pyridine quaternary ammonium salt prepared from 3-picoline and benzyl chloride through a reaction; the synergist is a mixture of potassium iodide, antimonous oxide and antimony trichloride in a weight ratio being (2-3):(1-2):(1-2). According to the compound high-temperature acidizing corrosion inhibitor based on the pyridine quaternary ammonium salt, the requirement of oilfield acidizing construction at the temperature of 120-160 DEG C is met, a corrosion inhibitor formula which is stable in property and good in corrosion inhibition performance, facilitates site construction and has cost advantage is provided, and the corrosion inhibitor has the characteristics that compatibility with commonly used acidizing additives in site, commonly used imidazoline corrosion inhibitors and other types of quaternary ammonium salt corrosion inhibitors is good, mixed use can be realized, construction is convenient and highly safe, no pollution is produced, transportation and storage are convenient, the cost is low and the like.
Description
technical field [0001] The invention relates to the technical field of oil field acidizing construction operations, in particular to a composite high-temperature acidizing corrosion inhibitor based on pyridine quaternary ammonium salts. Background technique [0002] In the acidizing of oil and gas wells, especially in high-temperature deep and ultra-deep wells with concentrated hydrochloric acid or a large amount of acid acidizing, the primary task is to solve the corrosion problem of high-temperature acidizing fluid on oil well casing equipment. In the pickling process, especially the pickling solution prepared with inorganic acid, it will cause a certain degree of corrosion and damage to metal equipment and materials. [0003] With the development of drilling technology and the progress of oil recovery technology, a large number of deep wells and ultra-deep wells have been put into development, and the number of acidizing measures has increased year by year, and higher req...
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