CN112080259B - Shale intercalation inhibitor prepared from environment-friendly hyperbranched polyquaternary ammonium salt amino acid - Google Patents
Shale intercalation inhibitor prepared from environment-friendly hyperbranched polyquaternary ammonium salt amino acid Download PDFInfo
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- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/03—Specific additives for general use in well-drilling compositions
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- C08G83/00—Macromolecular compounds not provided for in groups C08G2/00 - C08G81/00
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/02—Well-drilling compositions
- C09K8/04—Aqueous well-drilling compositions
- C09K8/14—Clay-containing compositions
- C09K8/18—Clay-containing compositions characterised by the organic compounds
- C09K8/22—Synthetic organic compounds
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/12—Swell inhibition, i.e. using additives to drilling or well treatment fluids for inhibiting clay or shale swelling or disintegrating
Abstract
The invention discloses an environment-friendly hyperbranched polyquaternary ammonium salt amino acid-prepared shale intercalation inhibitor, which belongs to the technical field of oil and gas field drilling, and is prepared by mixing hyperbranched polyquaternary ammonium salt polyamino acid and water, wherein the mass ratio of the hyperbranched polyquaternary ammonium salt amino acid in the shale intercalation inhibitor is 0.5-3%, and the hyperbranched polyquaternary ammonium salt amino acid is synthesized according to the following steps: s1, synthesizing a hyperbranched polymer; s2, purifying the hyperbranched polymer; s3 and end capping of the hyperbranched polymer. The shale intercalation inhibitor prepared from the hyperbranched polyquaternary ammonium salt amino acid provided by the invention is non-toxic and harmless, is easier to combine with negatively charged clay layers, has obviously improved inhibition performance compared with similar intercalation inhibitors, is easy to obtain raw materials, is low in price, is stable and reliable in synthesis method, and is suitable for industrial production.
Description
Technical Field
The invention relates to the technical field of oil and gas field drilling, in particular to a shale intercalation inhibitor prepared from hyperbranched polyquaternium amino acid.
Background
Borehole wall instability has always been a worldwide problem to be overcome during drilling. It often results in complex accidents such as borehole wall collapse, hole shrinkage, stuck drill, etc., increasing drilling time and drilling cost. According to statistical data, 75% of the borehole wall instability problems mainly occur in shale formations, particularly water-sensitive formations, the shale formations have high clay mineral content, the horizontal sections of shale gas horizontal wells are long, the drilling fluid is in contact with the formations for a long time, the shale is more seriously hydrated, and the borehole wall instability is more prominent. Although the oil-based drilling fluid has the advantages of high temperature resistance, salt and calcium corrosion resistance, contribution to well wall stability, good lubricity, small damage degree to an oil-gas layer and the like, the preparation cost of the oil-based drilling fluid is much higher than that of the water-based drilling fluid, the oil-based drilling fluid often causes serious influence on the ecological environment nearby a well site when in use, the mechanical drilling speed is generally lower than that of the water-based drilling fluid, and the popularization and the application of the oil-based drilling fluid are greatly limited by the defects.
With the gradual improvement of the environmental protection requirement in recent years, the development of water-based drilling fluid which has the same effect as oil-based drilling fluid and meets the environmental protection requirement to replace the oil-based drilling fluid is a trend of the current drilling fluid technology development. In order to overcome the defects of the existing inhibitor, researchers have conducted a great deal of experimental research on the inhibitor, but the variety really accepted by the market is not many, and particularly, the water-based drilling fluid which is suitable for high temperature and high density and meets the environmental protection requirement is still to be developed. In recent years, amino acid substances have attracted attention because of their advantages such as no biological toxicity, safety, and degradability.
However, the polyamine inhibitors studied and applied at present are mostly linear structures, and for the linear polyamine inhibitors, the linear polyamine inhibitors are usually in a random linear configuration after being dissolved in water, and when the linear polyamine inhibitors are used in a shale gas drilling process, winding and coating on clay are uneven, so that repeated adsorption or no adsorption is easily caused. Due to a series of unique physicochemical characteristics of low viscosity, high rheological property, good solubility and a large number of modifiable terminal functional groups, the hyperbranched polymer has a three-dimensional structure, so that the defects are improved by introducing the hyperbranched polymer.
Disclosure of Invention
In view of the problems, the invention provides a shale intercalation inhibitor prepared from hyperbranched polyquaternium amino acid, which responds to the requirement of environmental protection, has obviously improved inhibition performance compared with similar products, can completely meet the drilling requirements of various complex well conditions, has simple and environment-friendly synthesis process, higher yield and low production cost, and is suitable for industrial production.
In order to achieve the purpose, the technical scheme of the invention is as follows: a shale intercalation inhibitor prepared from hyperbranched polyquaternary ammonium salt amino acid is prepared by mixing hyperbranched polyquaternary ammonium salt amino acid and water, wherein the mass ratio of the hyperbranched polyquaternary ammonium salt amino acid in the shale intercalation inhibitor is 0.5-3%, the hyperbranched polyquaternary ammonium salt amino acid takes an amine compound and succinic anhydride as raw materials, and the quaternary ammonium salt amino acid compound as a capping reagent is synthesized by adopting the following steps:
(1) synthesis of hyperbranched polymer:
respectively dissolving 25mmol of amine compound and 25mmol of succinic anhydride in 100ml of organic solvent, dropwise adding succinic anhydride solution into the amine compound solution under the conditions of ice-water bath and nitrogen gas introduction stirring, heating to 25-35 ℃ after dropwise adding, reacting for 8-24h, and distilling under reduced pressure to obtain light yellow liquid after the reaction is finished.
(2) Purification of hyperbranched polymer:
preparation of hyperbranched polymer: dissolving the light yellow liquid obtained in the step (1) with 80-100ml of organic solvent, and carrying out reflux reaction for 4h at 90-110 ℃ under the conditions of nitrogen atmosphere and stirring. And repeatedly precipitating and washing the obtained product for 3 times by using an organic solvent, and drying in vacuum to obtain light yellow powder.
(3) End capping of the hyperbranched polymer:
and (3) dissolving the hyperbranched polymer obtained in the step (2) in 80-100ml of solvent, dropwise adding a capping reagent with the mass concentration of 50% under the condition of nitrogen atmosphere and stirring, and heating and sealing for reaction after the titration is finished. After the reaction is finished, washing, precipitating and separating the product by using an organic solvent for 3-5 times, and drying in vacuum to obtain the pure hyperbranched polyquaternium amino acid.
Further, the amine compound is one of 1-aminopiperazine, 1-piperazineethanolamine, 1-hexylaminopiperazine, 2-aminopiperidine, 4-aminopiperidine, 2-aminomethylpiperidine and 4-methyl-4-aminopiperidine.
Further, the organic solvent is one of absolute ethyl alcohol, absolute methyl alcohol, acetone, tetrahydrofuran and DMF.
Further, the end-capping reagent is quaternary ammonium salt amino acid with different hydrophobic chain lengths, namely one of 2-amino-4-trimethyl ammonium butyric acid, 2-amino-4-triamino ammonium valeric acid and 2-amino-6-trimethyl ammonium caproic acid.
Further, the dropping time of the steps (1) and (3) is controlled to be 25-40min, the reduced pressure distillation temperature of the step (1) is 80 ℃, and the absolute vacuum degree is less than 3000 Pa.
Further, the vacuum drying temperature of the steps (2) and (3) is 40-60 ℃.
Further, in the step S3, the closed reaction temperature is 35-55 ℃, and the reaction time is 4-8 h.
The invention has the following beneficial effects:
1. the product designed by the invention responds to the environmental protection requirement, and has the advantages of no biological toxicity, safety, degradability and the like;
2. the synthesis method has stable and reliable technology, high yield and low price of raw materials required by the synthesized product, and is suitable for industrial production;
3. the product provided by the invention contains a large amount of quaternary ammonium groups at the molecular terminal, and has the characteristics of enhancing water solubility and being superior to other inhibitors: because the clay surface has the negative charge, the quaternary ammonium group with the positive charge can be adsorbed on the clay surface to neutralize the electrical property of the clay surface, so that the electrostatic repulsion effect between the clays is weakened, the clays are easier to aggregate and flocculate, and a better inhibiting effect is achieved.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments of the present invention, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
(1) Synthesis of hyperbranched polymer: 2.52g 1-aminopiperazine and 2.50g succinic anhydride were weighed out exactly and dissolved in 100ml of tetrahydrofuran, respectively. Putting the 1-aminopiperazine solution into a three-neck flask, titrating and adding a succinic anhydride solution into the flask under the conditions of ice-water bath, nitrogen introduction and stirring, and after dropwise addition, heating to 25 ℃ for reaction for 8 hours. After the reaction is completed, the mixture is distilled under reduced pressure to obtain light yellow viscous liquid.
(2) Purification of hyperbranched polymer: dissolving the product obtained in the step (1) by using 80ml of methanol, and carrying out reflux reaction for 4 hours at the temperature of 100 ℃ under the conditions of nitrogen atmosphere and stirring. Dissolving the obtained product with methanol, washing with acetone, repeating for three times, and vacuum drying to obtain light yellow powder.
(3) End capping of the hyperbranched polymer: and (3) dissolving the hyperbranched polymer obtained in the step (2) in 80ml of distilled water, and dissolving 5.0g of 2-amino-4-trimethylammonium butyric acid in 100ml of distilled water to prepare a blocking solution. Dropwise adding an amino acid end capping solution into the hyperbranched polymer solution under the condition of stirring in nitrogen atmosphere, and after the titration is finished, raising the temperature to 50 ℃ for closed reflux reaction for 4 hours. After the reaction is finished, washing the product with distilled water, precipitating and separating with acetone, repeating the series of actions for three times, and then carrying out reduced pressure distillation to obtain the pure hyperbranched polyquaternium amino acid.
The structural formula of the hyperbranched polymer is shown as the following formula, and the structural formula of the hyperbranched polymer is an ideal and completely branched hyperbranched polymer.
Wherein R1 is-COCH2CH2CO(C4N2H8)-。
The structural formula of the hyperbranched polyquaternium amino acid obtained after end capping is shown as the following formula:
wherein R is1＝-COCH2CH2CO(C4N2H8)-，R2＝CO(NH2)CH2CH2N+(CH3)3。
Example 2
(1) Synthesis of hyperbranched polymer: 2.50g of 4-aminopiperidine and 2.50g of succinic anhydride are weighed out accurately and dissolved in 80ml of tetrahydrofuran, respectively. Putting the 1-aminopiperazine solution into a three-neck flask, titrating and adding a succinic anhydride solution into the flask under the conditions of ice-water bath, nitrogen introduction and stirring, and after dropwise addition, heating to 25 ℃ for reaction for 8 hours. After the reaction is completed, the mixture is distilled under reduced pressure to obtain light yellow viscous liquid.
(2) Purification of hyperbranched polymer: dissolving the product obtained in the step (1) by using 80ml of methanol, and carrying out reflux reaction for 4 hours at the temperature of 100 ℃ under the conditions of nitrogen atmosphere and stirring. Dissolving the obtained product with methanol, washing with acetone, repeating for three times, and vacuum drying to obtain light yellow powder.
(3) End capping of the hyperbranched polymer: the hyperbranched polymer obtained in (2) was dissolved in 80ml of distilled water, and 5.0g of 2-amino-4-trimethylammoniumbutyric acid was dissolved in 100ml of distilled water. Dropwise adding an amino acid end capping solution into the hyperbranched polymer solution under the condition of stirring in nitrogen atmosphere, and after the titration is finished, raising the temperature to 50 ℃ for closed reflux reaction for 4 hours. After the reaction is finished, washing the product with distilled water, precipitating and separating with acetone, repeating the series of actions for three times, and then carrying out reduced pressure distillation to obtain the pure hyperbranched polyquaternium amino acid.
The structural formula of the hyperbranched polymer is shown as the following formula, and the structural formula of the hyperbranched polymer is an ideal and completely branched hyperbranched polymer.
Wherein R is1＝-CO(CH2)CO[N(CH2)4CH]-
The structural formula of the hyperbranched polyquaternium amino acid obtained after end capping is shown as the following formula:
wherein R is1＝-CO(CH2)CO[N(CH2)4CH]-，R2＝CO(NH2)CH2CH2N+(CH3)3。
In order to further illustrate the effect of the environment-friendly shale intercalation inhibitor of the invention, the composite demulsifier in example 1 and example 2 was subjected to a performance test.
1. Linear expansion rate test the hyperbranched polyguanylic acid obtained in example 1-2 and clean water were prepared in a certain proportion (the mass ratio of the hyperbranched polyquaternium amino acid is 1%, 2%, 3%) into shale inhibitors and conventional shale inhibitors (conventional polyamine inhibitors and hexamethylenediamine inhibitors were selected) for comparative experiments, and clean water was used as a reference. The inhibition performance prepared in the above examples is evaluated by adopting a linear expansion ratio, and the specific operation steps refer to the petroleum and natural gas industry standard SY/T6335-1997 evaluation method of shale inhibitors for drilling fluids. The lower the linear expansion ratio, the better the inhibition performance of the inhibitor. The results of the experiments are shown in the following table.
TABLE 1 Linear expansion Rate test results
The results of the linear expansion rate tests in the table show that when ethylene diamine, polyamine, the hyperbranched quaternary ammonium salt amino acid obtained in example 1 and the hyperbranched quaternary ammonium salt amino acid obtained in example 2 are in the same proportion, the inhibition performance of the hyperbranched quaternary ammonium salt amino acid is obviously higher than that of hexamethylene diamine and polyamine shale inhibitor. The inhibition effect of the hyperbranched quaternary ammonium salt amino acid shale inhibitor is obviously higher than that of the conventional shale inhibitor. The influence of the inhibitor content on the linear expansion ratio shows that the linear expansion ratio is reduced and the inhibition performance is better as the mass ratio (0.5-3%) of the inhibitor is increased.
2. Rolling recovery test
The hyperbranched polyquaternium amino acid obtained in the example 1-2 and clean water are prepared into a shale inhibitor and a conventional shale inhibitor (the conventional polyamine inhibitor and the hexamethylenediamine inhibitor are selected) according to a proportion (the mass ratio of the hyperbranched polyquaternium amino acid is 1%, 2% and 3%) to carry out a comparison experiment, and the clean water is used as a reference. The performance of the shale inhibitor prepared in the above example is evaluated by rolling recovery, and the specific operation steps refer to SY/T5971-1994 evaluation method of performance of clay stabilizer for water injection. The higher the rolling recovery, the better the inhibition performance of the shale inhibitor. The results of the experiments are shown in the following table.
Test result of rolling recovery rate experiment
| Components | Recovery (%) |
| Clean water | 19.54 |
| 1% hexamethylene diamine | 34.31 |
| 1% of polyamine | 44.53 |
| 1% of the hyperbranched Polyquaternium amino acid obtained in example 1 | 85.23 |
| 2% of the hyperbranched polyquaternium amino acid obtained in example 1 | 87.41 |
| 3% of the hyperbranched polyquaternium amino acid obtained in example 1 | 90.02 |
| 1% of the hyperbranched polyquaternium amino acid obtained in example 2 | 84.98 |
| 2% of the hyperbranched polyquaternium amino acid obtained in example 2 | 87.37 |
| 3% of the hyperbranched polyquaternium amino acid obtained in example 2 | 89.74 |
The rolling recovery rate result shows that when the hexamethylene diamine, the polyamine and the hyperbranched polyquaternary ammonium amino acid obtained in the example are in the same mass ratio, the inhibition performance of the hyperbranched polyquaternary ammonium amino acid is obviously higher than that of the hexamethylene diamine and the polyamine shale inhibitor, and the result shows that the inhibition effect of the hyperbranched polyquaternary ammonium amino acid shale inhibitor is obviously higher than that of the conventional shale inhibitor. And the rolling recovery rate is increased along with the increase of the mass ratio (0.5-3%) of the inhibitor, and the inhibition effect is better.
3. Evaluation of environmental protection
The hyperbranched polyquaternium amino acid serving as the shale intercalation inhibitor has the advantages of excellent inhibition performance, simple production process and easy biodegradation. Biodegradation of polymers refers to the phenomenon of converting them into simple inorganic substances under the action of microorganisms (fungi, molds, etc.). Biodegradability is represented by biochemical property (BOD5/CODcr), BOD5 (reference standard HJ/T505-2009) is determined by a inoculation and dilution method, CODcr (reference standard YJ/T377-2007) is determined by a potassium dichromate method, the ratio is 56.2%, and the shale inhibitor is easy to degrade, so that the shale inhibitor is an environment-friendly shale inhibitor.
In conclusion, the preparation method of the hyperbranched poly-quaternary ammonium salt amino acid provided by the invention has stable and reliable technology and higher yield, and is suitable for industrial production; the synthesized hyperbranched polyquaternary ammonium salt amino acid product is non-toxic and harmless, has good water solubility, and the inhibition performance of the prepared shale intercalation inhibitor is obviously improved compared with similar products, thereby meeting the drilling requirements of various complex well conditions and effectively reducing the occurrence probability of unstable well wall caused by shale hydration dispersion.
Although the present invention has been described with reference to a preferred embodiment, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (4)
1. The shale intercalation inhibitor prepared from environment-friendly hyperbranched polyquaternium amino acid is characterized by being prepared by mixing hyperbranched polyquaternium amino acid and water, wherein the mass ratio of the hyperbranched polyquaternium amino acid in the shale intercalation inhibitor is 0.5-3%, the hyperbranched polyquaternium amino acid takes an amine compound and succinic anhydride as raw materials, the quaternary ammonium amino acid as a capping reagent, and the shale intercalation inhibitor is synthesized by adopting the following steps:
s1, synthesis of hyperbranched polymer: respectively dissolving 25m mol of amine compound and 25m mol of succinic anhydride in 100ml of organic solvent, dropwise adding succinic anhydride solution into the amine compound solution under the conditions of ice-water bath and nitrogen gas introduction stirring, heating to 25-35 ℃ after dropwise adding, reacting for 8-24h, and distilling under reduced pressure to obtain light yellow liquid after the reaction is finished;
s2, purification of hyperbranched polymer: dissolving the light yellow liquid obtained in S1 with 80-100ml of organic solvent, carrying out reflux reaction for 4h at 90-110 ℃ under the conditions of nitrogen atmosphere and stirring, repeatedly precipitating and washing the obtained product for 3 times by using the organic solvent, and carrying out vacuum drying to obtain a light yellow powdered hyperbranched polymer;
s3, end capping of the hyperbranched polymer: dissolving the hyperbranched polymer obtained in the step S2 in 80-100ml of organic solvent, dropwise adding a capping reagent with the mass concentration of 50% under the conditions of nitrogen atmosphere and stirring, carrying out closed reaction for 4-8h at 35-55 ℃ after titration is finished, washing, precipitating and separating the product by using the organic solvent for 3-5 times after the reaction is finished, and carrying out vacuum drying to obtain the hyperbranched poly (quaternary ammonium salt) amino acid;
the amine compound is one of 1-aminopiperazine, 1-piperazineethylamine, 1-hexylaminopiperazine, 2-aminopiperidine, 4-aminopiperidine, 2-aminomethyl piperidine and 4-methyl-4-aminopiperidine;
the quaternary ammonium salt amino acid is one of 2-amino-4-trimethyl ammonium butyric acid, 2-amino-4-trimethyl ammonium valeric acid and 2-amino-6-trimethyl ammonium caproic acid.
2. The shale intercalation inhibitor of claim 1, wherein the organic solvent is one of absolute ethanol, absolute methanol, tetrahydrofuran, acetone, and DMF.
3. The shale intercalation inhibitor according to claim 1, wherein the adding time of the steps S1 and S3 is controlled within 25-40min, the reduced pressure distillation temperature of S1 is 80 ℃, and the absolute vacuum degree is less than 3000 Pa.
4. The shale intercalation inhibitor according to claim 1, wherein the vacuum drying temperature of steps S2, S3 is 40-60 ℃.
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