JP2002060428A - Controlling agent for gashydrate formation and controlling process for gashydrate formation using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a controlling agent for gashydrate formation having a inhibitory function against gashydrate formation, and also to provide a controlling process for the gashydrate formation. SOLUTION: The controlling agent for gashydrate formation, contains a polymer compound obtained by (co)polymerizing a vinyl monomer expressed by formula (1), wherein R1, R2, and R3 are each independently H or a 1-2C alkyl group: Sp is O, S, NH, NR (R is a 1-2C alkyl group) or CnH2n (a linear or branched hydrocarbyl group in which (n) is 1 to 16); and X is a 3-10C linear or branched, hydrocarbyl group which may contain one or more of O and/or N, or a 3-10C heterocyclic group.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas hydrate production control agent such as methane hydrate and a method for controlling gas hydrate production.

[0002]

2. Description of the Related Art Water molecules surround dissolved gas molecules by placing an aqueous medium in which various gas molecules such as hydrocarbons such as methane and ethane and carbon dioxide gas are dissolved at a specific temperature and pressure. It is known that ice crystals, ie, gas hydrates, form. This gas hydrate is often produced during the extraction and transport of crude oil and natural gas,
This causes a blockage of the pipeline, etc., which is a major obstacle to safe and continuous operation.

On the other hand, it is known that gas hydrate exists naturally under high pressure and low temperature conditions. For example, under permafrost in cold regions such as Siberia and Alaska, or
Research has confirmed that a vast amount of methane gas hydrate (hereinafter referred to as methane hydrate) has been extensively deposited on the seabed deeper than several hundred meters. In recent years, methane hydrate has attracted attention as an energy source that emits less carbon dioxide, nitrogen and sulfur oxides, which are environmental pollution sources, and a method for safely extracting natural methane hydrate in a stable state has been desired. I have.

[0004] In order to solve the above-mentioned problems in transporting and storing the extracted gas hydrate and in extracting the gas hydrate from the sea floor or the ground floor, the following seemingly contradictory performances are required. It is required for the gas hydrate production control agent to be compatible. (1) The generation of gas hydrate is inhibited or the generation rate is reduced. (2) Promote the formation of gas hydrate (equilibrium stabilization) or reduce the decomposition rate of the generated gas hydrate (kinetic stabilization).

[0005] International Patent Publication No. WO 98/53007 discloses various additives having the function of inhibiting the formation and growth of gas hydrate and / or the aggregation of unstable core structures at the initial stage of gas hydrate formation, and the formation of various additives. Gas hydrate stabilizers are described. Specifically, it describes a homopolymer of acryloylpyrrolidine, a homopolymer of acryloylpiperidine, a copolymer of isopropylacrylamide and 2-acrylamido-2-methylpropanesulfonate, and the like. However, the effects of these polymers are not always satisfactory.

[0006]

SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide a gas hydrate generation controlling agent having a function of inhibiting gas hydrate generation, and a method for controlling gas hydrate generation. Further, the present invention provides a gas hydrate generation controlling agent having both a function of inhibiting gas hydrate generation and a function of stabilizing gas hydrate equilibrium and kinetic, and a method of controlling gas hydrate generation. It is in.

[0007]

SUMMARY OF THE INVENTION The present invention is a gas hydrate production control agent comprising a polymer compound obtained by (co) polymerizing a vinyl monomer represented by the formula (1). .

[0008]

Embedded image Here, R ¹ , R ² and R ³ in the formula each independently represent a hydrogen atom or an alkyl group having 1 or 2 carbon atoms, and Sp represents —O—, —S—, —NH—, —NR—
(R is an alkyl group having 1 or 2 carbon atoms), or -C
_n H _2n - _(n is linear or branched hydrocarbon group having from 1 to 16) represent, X represents an oxygen atom and / or nitrogen atom one or more which may contain a C 3-10 carbon Represents a linear or branched hydrocarbon group or a heterocyclic group having 3 to 10 carbon atoms.

The present invention also provides a method for controlling the production of gas hydrate, which comprises adding the above-mentioned gas hydrate generation controlling agent to a system capable of producing gas hydrate.

[0010]

DETAILED DESCRIPTION OF THE INVENTION Production of Gas Hydrate of the Invention
The polymer compound contained in the control agent is represented by the above formula (1).
Obtained by (co) polymerizing the vinyl monomer
You. Where R ¹, R^TwoAnd R^ThreeAre independently hydrogen sources
And represents an alkyl group having 1 or 2 carbon atoms,
p is -O-, -S-, -NH-, -NR- (R is carbon
An alkyl group of the formula 1 or 2), or -C_nH_2n−
(N is a linear or branched hydrocarbon group of 1 to 16)
X represents one oxygen atom and / or one nitrogen atom
A straight or branched chain having 3 to 10 carbon atoms which may be contained above
A branched hydrocarbon group or a heterocyclic group having 3 to 10 carbon atoms
Represents

As the vinyl monomer represented by the formula (1), tetrahydrofurfuryl (meth) acrylate, β
-(Meth) acryloyloxy-β-methyl-δ-valerolactone, β- (meth) acryloyloxy-γ-butyrolactone, β- (meth) acryloyloxy-β-
Methyl-γ-butyrolactone, α- (meth) acryloyloxy-γ-butyrolactone, glycerin carbonate (meth) acrylate, 1,3-dioxan-2-one-5-yl (meth) acrylate, 4,4-dimethyl-1 , 3-dioxan-2-one (meth) acrylate, tetrahydrofurfuryl (meth) acrylamide,
Nt-butyl (meth) acrylamide, Ns-butyl (meth) acrylamide, Nn-butyl (meth) acrylamide, N-2-hydroxyethyl-N-isopropyl (meth) acrylamide, N-2-hydroxy Ethyl-Nt-butyl (meth) acrylamide, N-2
-Hydroxyethyl-Nt-butyl (meth) acrylamide, N-2-hydroxy-1,1-dimethylethylethyl (meth) acrylamide, N-3-n-propoxypropyl methacrylamide, Nn-butoxypropyl ( (Meth) acrylamide, N-isobutoxypropyl (meth) acrylamide, N-2-ethylhexyloxypropylacrylamide, N-furfuryl (meth)
Acrylamide, N-3-methylthiopropyl (meth)
Acrylamide, N-3-chloropropyl (meth) acrylamide, N-cyclopropyl (meth) acrylamide, N-methyl-N-isopropyl (meth) acrylamide, N-methyl-NN-propyl (meth) acrylamide, N- Ethyl-N-isopropyl (meth) acrylamide, N-ethyl-Nn-propyl (meth) acrylamide, N-acryloylmethylhomopiperazine, N-acryloylmethylpiperazine, N-3-morpholinepropyl (meth) acrylamide, N- (2,2
-Dimethoxyethyl) -N-methyl (meth) acrylamide, N- (1,3-dioxan-2-ylmethyl)-
N-methyl (meth) acrylamide, N-8- (meth)
Acryloyl-1,4-dioxa-8-aza-spiro [4.5] decane, N- (meth) acryloyl-2,6
-Dimethylmorpholine, N-2-methoxyethyl-N-
Methyl (meth) acrylamide, N-2-methoxyethyl-N-ethyl (meth) acrylamide, N-2-methoxyethyl-Nn-propyl (meth) acrylamide, N-2-methoxyethyl-N-isopropyl (meth) ) Acrylamide, N-2-methoxyethyl-Nt
-Butyl (meth) acrylamide, N, N-di (2-methoxyethyl) acrylamide, N-2-hydroxyethyl-N- (meth) acrylamide, N-2-hydroxyethyl-N-ethyl (meth) acrylamide, N -2
-Hydroxyethyl-NN-propyl (meth) acrylamide, N-3-hydroxypropyl (meth) acrylamide, N-2-methoxyethyl (meth) acrylamide, N-2-ethoxyethyl (meth) acrylamide, N-3 -Methoxypropyl (meth) acrylamide, N-3-ethoxypropyl (meth) acrylamide, N-3-isopropoxypropyl (meth) acrylamide, N-3-n-propoxypropylacrylamide, N-3- (2-methoxyethoxy) ) Propyl (meth) acrylamide, N-1-methyl-2-methoxyethyl (meth) acrylamide, N-1-methoxymethylpropylacrylamide and the like.

In particular, tetrahydrofurfuryl (meth) acrylate, N-tetrahydrofurfuryl (meth) acrylamide, N- (2,2-dimethoxyethyl) -N-
Methyl (meth) acrylamide, N- (1,3-dioxan-2-ylmethyl) -N-methyl (meth) acrylamide, N-2-methoxyethyl-N-ethyl (meth)
Acrylamide, N, N-di (2-methoxyethyl) acrylamide, N-3-methoxypropyl (meth) acrylamide, N-3- (2-methoxyethoxy) propyl (meth) acrylamide, N-furfuryl (meth) acrylamide preferable.

The polymer compound obtained by (co) polymerizing the vinyl monomer represented by the formula (1) contained in the gas hydrate formation controlling agent of the present invention is obtained by homopolymerizing this monomer. Or a copolymer copolymerized with another monomer. However, it is preferable that the vinyl monomer represented by the formula (1) is copolymerized with another monomer at a ratio of 0.01 to 80 mol%, and particularly, at a ratio of 0.05 to 50 mol%. Polymerized ones are preferred.

The monomer copolymerizable with the vinyl monomer represented by the formula (1) may be any monomer having a reactive group copolymerizable with the formula (1) such as a vinyl group. For example, N-
(Meth) acrylamide, N-methyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N
-Ethyl (meth) acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, N-isopropenylpyrrolidone, N-isopropenylcaprolactam, N-vinylformamide, N-vinylacetamide, N-vinyl-N-methylacetamide, N- Vinyl-N-methylformamide, N-vinyl-N-propionamide,
(Meth) acrylic acid and its salts, 2-hydroxyethyl (meth) acrylate, vinyl acetate, vinyl propionate, methyl vinyl ether, ethyl vinyl ether, 2-vinyl-2-oxazoline, 2-vinyl-4-
Methyl-2-oxazoline, 2-isopropyl-2-oxazoline, maleic acid, vinylimidazole, maleic acid, vinylimidazole, dimethylaminoethyl (meth) acrylate methyl chloride salt, dimethylaminoethyl (meth) acrylate benzyl chloride salt, 2
-(Meth) acrylamide-2-methylpropanesulfonic acid and its salts, (meth) acrylamide methanesulfonic acid and its salts, (meth) acrylamideethanesulfonic acid and its salts, 2- (meth) acrylamide-n-butanesulfonic acid And salts thereof, glycosyloxyethyl acrylate, glycosyloxyethyl methacrylate, glycosyloxyethyl-α-ethyl acrylate, glycosyloxyethyl-β-methyl acrylate, glycosyloxyethyl-β, β-dimethyl acrylate, glycosyloxyethyl-β-ethyl Acrylate, glycosyloxyethyl-β, β-diethyl acrylate, (meth) acrylates such as methyl (meth) acrylate, styrene, α-methylstyrene, (meth) acrylic Lonitrile and the like.

Since the homopolymer of the vinyl monomer represented by the formula (1) may be insoluble in water, the monomer copolymerized with the vinyl monomer represented by the formula (1) is Water-soluble monomers are preferred. Such water-soluble monomers include, for example, (meth) acrylamide, N-methyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-vinylpyrrolidone, N-vinyl Caprolactam, N-isopropenyl pyrrolidone, N-isopropenyl caprolactam,
N-vinylformamide, N-vinylacetamide, N
-Vinyl-N-methylacetamide, N-vinyl-N-
Methylformamide, N-vinyl-N-propionamide, (meth) acrylic acid, alkali metal (meth) acrylate, 2-hydroxyethyl (meth) acrylate,
Vinyl acetate, vinyl propionate, methyl vinyl ether, ethyl vinyl ether, 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2
-Isopropyl-2-oxazoline and the like. Among them, N- (meth) acrylamide, N-methyl (meth) acrylamide, N, N-dimethyl (meth) acrylamide, N-ethyl (meth) acrylamide, N-vinylpyrrolidone, N-vinylcaprolactam, N-isopropenylpyrrolidone , N-isopropenylcaprolactam, N-vinylformamide, N-vinylacetamide, N-vinyl-N-methylacetamide, and N-vinyl-N-methylformamide are preferred.

The method of copolymerization is not particularly limited, and a known method can be used. As such a copolymerization method, for example, a solution obtained by dissolving a monomer represented by the formula (1), a monomer to be copolymerized, and a polymerization initiator in an arbitrary solvent is dissolved in a heated solvent. And the like. As the type of the polymerization initiator, an azo type, a peroxide type, a redox type or the like is used.

The gas hydrate formation controlling agent of the present invention is a polymer compound itself obtained by (co) polymerization in this way, or contains this polymer compound as an active ingredient. The molecular weight of this polymer compound is preferably in the range of 1,000 to 500,000, and more preferably in the range of 3,000 to 100,000. The larger the molecular weight is, the more the gas hydrate stabilizing effect and the generation suppressing effect are improved.

According to the gas hydrate generation control method of the present invention, the above-mentioned gas hydrate generation controlling agent of the present invention is added to a system capable of generating gas hydrate. Here, “a system capable of producing gas hydrate” refers to, for example, J. Long, A. Lederhos, A. Sum, R. Chris
tiansen, ED Sloan; Prep. 73rd Ann. GPA Conv., 1
994, pages 1-9, refers to a system in which a substance that forms gas hydrate is dissolved in an aqueous solvent. In such a system, gas hydrate precipitates as a crystal under specific pressure and temperature conditions.

Examples of the substance forming the gas hydrate include gases such as carbon dioxide, nitrogen, oxygen, hydrogen sulfide, argon, xenon, ethane and propane, and liquids such as tetrahydrofuran.

As a system capable of producing gas hydrate, for example, in a natural gas well or oil well, an aqueous phase in which a gas such as ethane or propane is dissolved in an aqueous solvent such as water or seawater is used as a liquefied gas or a crude oil. And a system in which a gaseous phase such as natural gas exists in the aqueous phase.

The method of adding the gas hydrate formation controlling agent of the present invention to a system capable of forming gas hydrate is not particularly limited, but it is preferable to add the agent after dissolving in water and / or a solvent miscible with water. . The water-miscible solvent refers to a solvent that is mixed with water at an arbitrary ratio, for example,
Examples include methanol, ethanol, and acetone.

In the present invention, the gas hydrate formation controlling agent to be added includes one type of formation controlling agent other than the polymer compound obtained by (co) polymerizing the vinyl monomer represented by the formula (1). Alternatively, two or more kinds may be included. In that case, the proportion of the polymer compound obtained by (co) polymerizing the vinyl monomer represented by the formula (1) in the entire gas hydrate formation controlling agent is preferably 10% by mass or more, particularly 50% by mass.
The above is preferred.

The amount of the gas hydrate formation controlling agent to be added is preferably 0.01 to 30 parts by mass, more preferably 0.01 to 30 parts by mass, per 100 parts by mass of free water contained in the system capable of producing gas hydrate. 10 parts by mass is more preferred. The larger the amount of the gas hydrate production control agent added, the more the gas hydrate stabilizing effect increases, and the smaller the amount, the lower the viscosity of the system and the higher the flowability. However, if the amount of addition is extremely large, the effect of stabilizing the gas hydrate may be reduced.

When using the gas hydrate generation controlling agent of the present invention, various additives such as a rust inhibitor, a lubricant, a dispersant, a scale adhesion inhibitor, a corrosion inhibitor and the like are used in combination. Is also good.

[0025]

The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to these examples.

<Evaluation Apparatus> The gas hydrate generation controlling agent, the gas hydrate generation inhibition performance, the gas hydrate equilibrium stabilization performance, and the gas hydrate kinetic stabilization performance are shown in FIG. Was evaluated using

In this apparatus, the reaction high-pressure cell 1 has an internal capacity of 100 ml and a normal pressure resistance design up to 20 MPa. This cell is provided with a gas introduction line 1, a liquid introduction line 2, a purge line 3, a cell thermometer 5, a cell pressure gauge 6, and a reaction cell stirrer 7. The entire cell is housed in a thermostat 8, and the temperature in the cell can be adjusted by the temperature of the thermostat 8. In the reaction high pressure cell 1,
Three internal observation windows (not shown) having a diameter of 3 cm are provided at three locations so that the inside of the cell can be observed.

<Evaluation Method of Production Inhibition Performance> The gas hydrate production inhibition performance was evaluated as follows. That is,
A 0.5 mass% aqueous solution of a gas hydrate production control agent to be evaluated was introduced from a liquid introduction line 2, and methane gas was introduced from a gas introduction line 1 to reduce the pressure inside the cell to 10%.
The pressure in the cell was set to 20 ° C., which is a temperature clearly higher than the methane hydrate formation equilibrium temperature at that pressure. -4 ° C while stirring the inside of the cell
When the temperature inside the cell is gradually decreased at / hr, a state in which methane hydrate is generated inside the cell at a certain temperature is observed. The generation of methane hydrate lowers the pressure in the cell, and at the same time, the generation of gas hydrate is an exothermic reaction, so that the temperature in the cell slightly increases. It was evaluated that the lower the temperature in the cell at which the pressure starts to drop significantly, that is, the lower the methane hydrate formation temperature, the greater the gas hydrate formation inhibition performance.

<Evaluation Method of Equilibrium Stabilization Performance> Equilibrium stabilization performance was evaluated as follows. That is, after measuring the methane hydrate generation temperature in the above-described performance evaluation, lower the temperature of the constant temperature bath by 2 ° C. from the methane hydrate generation start temperature, and leave until the cell pressure and the cell temperature become constant. I do. Thereafter, the temperature in the cell was set at 4 ° C./hr.
As the pressure rises, the methane hydrate in the cell gradually begins to decompose and eventually completely separates into water and methane gas.
It was evaluated that the higher the temperature in the cell, that is, the temperature at which methane hydrate was decomposed, the higher the equilibrium stabilization performance against gas hydrate.

<Evaluation Method of Kinetic Stabilization Performance> The kinetic stabilization performance of kinetically decreasing the decomposition rate of gas hydrate and delaying the decomposition of gas hydrate was evaluated as follows. That is, after generating methane hydrate in the same procedure as measuring the methane hydrate generation temperature in the evaluation of the generation inhibition performance described above, the temperature in the constant temperature bath was set to 2 ° C., and the pressure in the cell and the temperature in the cell were lowered. Leave until constant. Thereafter, the methane gas in the cell is discharged to set the pressure in the cell to 2 MPa. The cell was sealed under these conditions, and the time until the pressure in the cell became constant was measured. It was evaluated that the longer this time (hereinafter referred to as “kinetic decomposition delay time”), the greater the kinetic stabilization performance in the decomposition of methane hydrate.

Example 1 Tetrahydrofurfuryl methacrylate 9.1 was placed in a 300 ml separable flask.
g, 33.4 g of N-acrylamide and 150 g of methyl isobutyl ketone, followed by nitrogen bubbling to remove dissolved oxygen. Thereafter, the temperature in the flask was raised to 80 ° C., and an azo-based initiator, 2,
A solution prepared by dissolving 2.0 g of 2'-azobisisobutyronitrile in 8 g of methyl isobutyl ketone was added to initiate polymerization. The polymerization was carried out with stirring under a nitrogen flow,
The reaction was continued at 5 ° C. for 5 hours. After allowing to cool, the polymerization solution was poured into 3 L of diethyl ether while stirring, and the polymer obtained as a precipitate was dried in vacuo at 70 ° C. After dissolving the polymer in 200 g of acetone again, 3 L of n-hexane was used.
The polymer obtained by re-precipitation was dropped at 70 ° C.
Vacuum drying overnight to obtain 32 g of a white powdery polymer.

The composition of the obtained polymer was measured by ¹ H-NMR. As a result, the composition ratio of tetrahydrofurfuryl methacrylate was 9.1 mol%. The molecular weight was measured using GPC using dimethylformamide as a mobile phase. As a result, the number average molecular weight was 1 in terms of standard PMMA.
000, and the weight average molecular weight was 43,000.

The thus obtained tetrahydrofurfuryl methacrylate / N-acrylamide copolymer (gas hydrate formation controlling agent) was evaluated.
The gas hydrate formation temperature was 4.0 ° C., and the gas hydrate decomposition end temperature was 16.6 ° C. The kinetic decomposition delay performance time was 300 minutes.

Example 2 The same operation as in Example 1 was carried out, except that the charged amounts of tetrahydrofurfuryl methacrylate and N-acrylamide were changed, to obtain N-tetrafluorofurfuryl methacrylate having a composition ratio of 5 mol%. A copolymer with acrylamide was obtained. This polymer had a number average molecular weight of 15,000 and a weight average molecular weight of 56,000.
Met.

The tetrahydrofurfuryl methacrylate / N-acrylamide copolymer (gas hydrate formation controlling agent) thus obtained was evaluated.
The gas hydrate formation temperature was 4.1 ° C, and the gas hydrate decomposition end temperature was 16.0 ° C. The kinetic decomposition delay performance time was 260 minutes.

Example 3 The same operation as in Example 1 was carried out on N-tetrahydrofurfurylacrylamide and N-isopropylmethacrylamide, and N-isopropylmethacrylyl having a composition ratio of N-tetrahydrofurfurylacrylamide of 40 mol% was used. A copolymer with amide was obtained. The number average molecular weight of this polymer was 8,000, and the weight average molecular weight was 20,000. N-tetrahydrofurfurylacrylamide / N-
When the isopropyl methacrylamide copolymer (gas hydrate formation controlling agent) was evaluated, the gas hydrate formation temperature was 3.8 ° C., and the gas hydrate decomposition end temperature was 16.5 ° C. The kinetic decomposition delay performance time was 320 minutes.

Example 4 N- (2,2-dimethoxyethyl) -N-methacrylamide and N-isopropylacrylamide were subjected to the same operation as in Example 1 to give N-
A copolymer with (2,2-dimethoxyethyl) -N-methacrylamide and N-isopropylmethacrylamide having a composition ratio of 50 mol% was obtained. The number average molecular weight of this polymer was 10,000 and the weight average molecular weight was 22,000.

The N- (2,2-dimethoxyethyl) -N-methacrylamide / N-isopropylacrylamide copolymer (gas hydrate formation controlling agent) thus obtained was evaluated. The formation temperature is 3.9 ° C, and the gas hydrate decomposition end temperature is 16.
8 ° C. The kinetic decomposition delay performance time is 28
It was 0 minutes.

Comparative Example 1 The gas hydrate generation temperature and gas hydrate decomposition were performed in the same manner as in Example 1 except that the same amount of distilled water was used instead of the aqueous solution of the gas hydrate generation controlling agent. When the end temperature was measured, the formation temperature of the gas hydrate was 8.9 ° C., and the decomposition end temperature of the gas hydrate was 11.9 ° C. The kinetic decomposition delay performance time was 40 minutes.

Comparative Example 2 Polymerization was carried out in the same manner as in Example 1 using only N-isopropylacrylamide as a monomer to obtain a homopolymer of N-isopropylacrylamide. When this homopolymer of N-isopropylacrylamide was evaluated, the gas hydrate formation temperature was 4.4 ° C., and the gas hydrate decomposition end temperature was 14.2 ° C. The kinetic decomposition delay performance time was 200 minutes.

[0041]

The gas hydrate formation controlling agent of the present invention can be used under the conditions where gas hydrate is formed.
It has an inhibitory effect of suppressing its production. Further, the gas hydrate generation controlling agent of the present invention has an effect of stabilizing the gas hydrate equilibrium and kinetic under the condition that the gas hydrate is gradually decomposed. By using such a gas hydrate generation controlling agent of the present invention, gas hydrate generation can be effectively controlled.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an apparatus for evaluating the performance of a gas hydrate production control agent.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Gas introduction line 2 Liquid introduction line 3 Purge line 4 High pressure cell for reaction 5 Thermometer in reaction cell 6 Pressure gauge in reaction cell 7 Stirrer in reaction cell 8 Constant temperature bath

 ──────────────────────────────────────────────────続 き Continued on the front page F term (Reference) 4J100 AE03Q AE04Q AF10P AG02Q AG04Q AJ02Q AK08Q AL08P AL09Q AM15Q AM17P AM17Q AM19Q AM21P AN02Q AQ06Q AQ08Q AQ15Q BA02P BA03P BA04P BA11P BA28 BC02P

Claims (6)

[Claims] 1. A gas hydrate generation controlling agent comprising a polymer compound obtained by (co) polymerizing a vinyl monomer represented by the formula (1). Embedded image Here, R ¹ , R ² and R ³ in the formula each independently represent a hydrogen atom or an alkyl group having 1 or 2 carbon atoms, and Sp represents —O—, —S—, —NH—, —NR— ( R
Alkyl group) having 1 or 2 carbon atoms, or -C _n H
_2n- (n represents a linear or branched hydrocarbon group having 1 to 16), and X represents a straight chain having 3 to 10 carbon atoms which may contain at least one oxygen atom and / or nitrogen atom. Alternatively, it represents a branched hydrocarbon group or a heterocyclic group having 3 to 10 carbon atoms. 2. The gas according to claim 1, wherein the polymer compound is obtained by copolymerizing the vinyl monomer represented by the formula (1) at a ratio of 0.01 to 80 mol%. Hydrate formation control agent. 3. The gas hydrate according to claim 1, wherein the polymer compound is obtained by copolymerizing a vinyl monomer represented by the formula (1) and a water-soluble monomer. Control agents. 4. A method for controlling the production of gas hydrate, comprising adding the gas hydrate generation controlling agent according to claim 1 to a system capable of producing a gas hydrate. 5. The gas according to claim 4, wherein a solution obtained by dissolving the hydrate production controlling agent according to claim 1 in water and / or a solvent miscible with water is added to a system capable of producing gas hydrate. Hydrate generation control method. 6. The addition amount of the gas hydrate production controlling agent according to claim 1 to 0.01 to 100 parts by mass of free water contained in a system capable of producing gas hydrate.
The gas hydrate generation control method according to claim 4 or 5, wherein the amount is 0 parts by mass.