A kind of composite anti-salt agent and its application
A technology for preventing salt and salt water drilling fluid, applied in drilling compositions, chemical instruments and methods, pipeline systems, etc., can solve the problems of high cost, harsh synthesis conditions and methods, etc., to prevent salt crystallization, excellent salt crystallization, etc. , the effect of increasing solubility
Active Publication Date: 2020-09-01
CHINA PETROLEUM & CHEM CORP +1
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Embodiment 1
[0024] A composite salt-repelling agent solution is composed of 0.180% of potassium ferrocyanide, 0.30% of nitrilotriacetic acid, 0.010% of anionic polyacrylamide and the balance of water in terms of weight percentage. The preparation method is as follows: first dissolving anionic polyacrylamide in water to obtain a mixed solution; then dissolving 0.180% potassium ferrocyanide (A) and nitrilotriacetic acid in the mixed solution to form a composite salt-repellent aqueous solution.
Embodiment 2
[0031] A composite anti-salt agent is composed of potassium ferrocyanide and nitrilotriacetic acid, the mass ratio of which is 8:5.
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The invention discloses a composite anti-salt agent, which mainly comprises a ferrocyanide solubilizer A and a complexone B, and can further comprise a polymer lattice modifier C and / or water. According to the present invention, the composite anti-salt agent has a synergistic effect, wherein the ferrocyanide solubilizer A in the composite anti-salt agent can substantially increase the solubility of the salt, and provides the main effect of the composite anti-salt agent, the complexone B in the composite anti-salt agent has good complexation effects on metal ions and can change the metal ion concentration of the salt crystal so as to reduce the solubility product of the salt crystal, and the polymer lattice modifier C can change the compact structure of the salt into the loose structure soas to make the salt be easily carried away by the flowing of the solution. According to the present invention, the composite anti-salt agent can provide excellent salt crystallization prevention effect on salt solutions with highly mineralized sodium chloride, and further can provide good salt release effects on salt solutions with highly mineralized sodium chloride, calcium chloride and magnesiumchloride.
Description
technical field [0001] The invention relates to the technical field of salt-repelling agent and its application, in particular to a composite salt-repelling agent and its application. Background technique [0002] The anti-salt agent can mainly increase the solubility of salt, so that the salt is not easy to crystallize and precipitate. In addition, the anti-salt agent can change the crystallization type of salt and the dense structure of salt crystallization. The dense structure can be changed into a loose and finely divided floc structure. Make it easy to dissolve and remove, so as to avoid salt formation. The effect of a single anti-salt agent is not very good, and the compound chemical anti-salt agent generally has a good effect, but the cost is relatively high. [0003] At present, chemical salt inhibitors mainly include inorganic salt inhibitors. Inorganic salt inhibitors are mainly compounds of cyanide and benzene derivatives. Although the effect of salt prevention i...
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IPC IPC(8): C09K8/03C09K8/528F17D1/17
CPCC09K8/03C09K8/528F17D1/17
Inventor 龚兵夏志刚陈金菊方宏贺春马超苏继峰孟婧黄守国杨宏斌
Owner CHINA PETROLEUM & CHEM CORP
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