DEPOSITION CONTROLLING AGENT FOR CLATHRATED HYDRATE CRYSTAL AND CONTROL OF DEPOSITION OF CLATHRATED HYDRATE CRYSTAL USING THE AGENT

摘要

PROBLEM TO BE SOLVED: To obtain the subject controlling agent containing a polymeric compound having a specific cyclic iminoether structure on a side chain, highly effective for delaying the formation of clathrated hydrate crystal and suppressing the growth of the crystal and suitable for preventing the clogging of a pipeline during the drilling and transportation of crude oil, natural gas, etc. ;SOLUTION: This controlling agent contains a polymeric compound having a structure of the formula {P₁ is a polymer main chain; Z is direct bond or a group of the formula II [R₅ and R₆ are each H, a halogen, an alkyl, an aralkyl, a (substituted)phenyl or OH]; R₁ to R₄ are each R₅} in the molecule [e.g. a polymer produced by polymerizing a monomer component containing a compound of the formula III (R₇ is an acyclic organic group having an addition-polymerizable unsaturated bond) such as 2-isopropenyl-2-oxazoline]. The agent is preferably added in an amount of 0.01-30 pts.wt. based on the free water existing in the system and capable of forming a clathrated hydrate crystal.;COPYRIGHT: (C)1997,JPO