Ionic liquid shale inhibitor for drilling fluid and preparation method thereof
The technology of shale inhibitor and ionic liquid is applied in the field of drilling fluid, which can solve the problems of poor inhibitory performance of water-based drilling fluid and poor environmental friendliness of oil-based drilling fluid, and achieves good inhibitory effect, low drug cost and simple preparation method. Effect
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Embodiment approach
[0018] Furthermore, in order to ensure that the inhibitory effect reaches a relatively excellent level, the inventors of the present invention have optimized the structure of the ionic liquid. According to a preferred embodiment of the present invention, the imidazole ionic liquid includes a cationic monomer and an anionic monomer, and the general structural formula of the cationic monomer is where R 1 and R 2 each independently selected from C 2 -C 8 substituted or unsubstituted alkyl or alkenyl, and R 1 and R 2 The number of double bonds contained in the total is 1-4.
[0019] According to the method of the present invention, the R 1 and R 2 each independently selected from C 2 -C 8 the alkyl or alkenyl, the C 2 -C 8 The alkyl or alkenyl group can be substituted or unsubstituted, preferably unsubstituted.
[0020] In the following preferred embodiments of the method described in the first aspect of the present invention, R 1 and R 2 The choices are unsubstitut...
Embodiment 1A
[0090] (1) Preparation of ionic liquid: raw material A (structure is where R 1 is vinyl) and raw material B (structure is R 2 R 3 , where R 2 is ethyl, R 3 bromine) was added into a three-necked flask at a molar ratio of 1:1, heated to 70°C under nitrogen protection, and contacted and reacted for 4 days under mechanical stirring at 200 rpm / min. After taking it out, it was purified by rotary evaporation with ether for 2 days, and dried in vacuo After 3 days, the ionic liquid was prepared.
[0091] (2) Dissolve the ionic liquid obtained in step (1) in deionized water at a weight ratio of 1:4, then raise the temperature to 40°C, and blow nitrogen gas for 30 minutes while stirring to remove all oxygen.
[0092] (3) Polymerization by free radical polymerization: continue to feed nitrogen, add the mixture of initiator ammonium persulfate and ferrous sulfate (molar ratio is 1:1) into the reactor, the amount of initiator added and the raw material The molar ratio of A was 1:100...
Embodiment 2A
[0095] Steps (1) (2) are the same as in Example 1A.
[0096] (3) Polymerization by the method of free radical polymerization: continue to feed nitrogen, add the mixture of initiator ammonium persulfate and sodium sulfite (molar ratio is 1:1) in the reactor, the addition amount of initiator is the same as that of raw material A The molar ratio was 0.1:100, the temperature was raised to 60° C. at a stirring speed of 170 rpm, and the reaction was stopped after 4 hours of reaction.
[0097] (4) Put the reaction product into a vacuum drying oven at 70° C. for drying, cut into pieces and pulverize to obtain an ionic liquid shale inhibitor for drilling fluid, which is designated as 2A.
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Abstract
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