CN109868129B - Viscosity reducer for thickened oil production and preparation method thereof - Google Patents

Viscosity reducer for thickened oil production and preparation method thereof Download PDF

Info

Publication number
CN109868129B
CN109868129B CN201910282853.1A CN201910282853A CN109868129B CN 109868129 B CN109868129 B CN 109868129B CN 201910282853 A CN201910282853 A CN 201910282853A CN 109868129 B CN109868129 B CN 109868129B
Authority
CN
China
Prior art keywords
maleic anhydride
viscosity reducer
viscosity
thickened oil
oil recovery
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201910282853.1A
Other languages
Chinese (zh)
Other versions
CN109868129A (en
Inventor
李春霞
郝琦
薛迪
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shaanxi Yanchang Petroleum Group Co Ltd
Original Assignee
Shaanxi Yanchang Petroleum Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shaanxi Yanchang Petroleum Group Co Ltd filed Critical Shaanxi Yanchang Petroleum Group Co Ltd
Priority to CN201910282853.1A priority Critical patent/CN109868129B/en
Publication of CN109868129A publication Critical patent/CN109868129A/en
Application granted granted Critical
Publication of CN109868129B publication Critical patent/CN109868129B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Landscapes

  • Polysaccharides And Polysaccharide Derivatives (AREA)
  • Cosmetics (AREA)

Abstract

The invention discloses a viscosity reducer for thickened oil extraction, which comprises the following components in percentage by mass: 15-20% of zwitterionic surfactant, 5-10% of di (2-ethylhexyl) phthalate, 3-5% of maleic anhydride acylated chitosan salt, 1-3% of polycaprolactone grafted starch nanocrystal, 0.1-0.3% of EDTA-2Na and the balance of water. The invention also provides a preparation method of the viscosity reducer for thickened oil recovery. The zwitterionic surfactant and the di (2-ethylhexyl) phthalate added in the formula have the main viscosity reduction effect, and other components such as maleic anhydride acylation chitosan salt and polycaprolactone grafted starch nanocrystal are matched for use to achieve the synergistic effect. The viscosity reducer prepared by the invention has good viscosity reducing effect on extra-heavy oil, super-heavy oil and high asphaltene content, the viscosity reducing rate can reach more than 90%, and the viscosity reducer has wide application prospect.

Description

Viscosity reducer for thickened oil production and preparation method thereof
Technical Field
The invention belongs to the technical field of petroleum exploitation auxiliary agents, and particularly relates to a viscosity reducer for thickened oil extraction and a preparation method thereof.
Background
The rapid development of economy drives the market to demand a great deal of crude oil, the recoverable reserves of the crude oil are becoming less and less, more than 45% of the recoverable reserves of light crude oil are consumed by human beings in the past hundred years, the conventional crude oil is not enough to be recovered, and the recovery of the conventional crude oil cannot meet the demands of people on resources.
China has rich thick oil resources and huge exploitation potential, but the characteristics of thick oil determine that the exploitation of the thick oil has certain difficulty. The heavy oil is crude oil with high content of asphaltene and colloid and high viscosity, the composition is complex, the density and the viscosity are far higher than those of light crude oil, the fluidity at normal temperature is poor, the exploitation and the transportation are extremely difficult, and the industrial cost is high. Therefore, the reduction of the viscosity of the thick oil and the enhancement of the fluidity of the thick oil become the hot and difficult problems of the chemical research of oil fields in recent years.
The accumulation of the colloid and the asphaltene in the thickened oil is the reason for the high viscosity of the thickened oil, and the viscosity of the thickened oil can be reduced if the colloid and the asphaltene in the thickened oil can be effectively dispersed. The viscosity reduction method of the common thick oil is mainly to add an emulsification viscosity reducer to reduce the viscosity, but the emulsification viscosity reducer commonly used in the oil field is not suitable for the thick oil with high content of extra-extra thick oil and asphalt, because for the extra-extra thick oil and the thick oil with more than 30% of asphaltene content, a strong adsorption film can be formed on an oil-water interface, the strength of the interface film is high, and the viscosity reducer molecules are difficult to cause phase inversion of a thick oil emulsion on the oil-water interface so as to reduce the viscosity. Therefore, it is necessary to develop a new viscosity reducer for heavy oil recovery to solve the problem, so that the viscosity reducer can be suitable for the viscosity reduction of extra heavy oil and heavy oil with high asphalt content.
Disclosure of Invention
The invention provides a viscosity reducer for thickened oil production, which solves the problem that the viscosity reducer in the prior art has an unsatisfactory viscosity reducing effect on thickened oil with high content of ultra-super thickened oil and asphalt.
The invention aims to provide a viscosity reducer for thickened oil recovery, which comprises the following components in percentage by mass: 15-20% of zwitterionic surfactant, 5-10% of di (2-ethylhexyl) phthalate, 3-5% of maleic anhydride acylated chitosan salt, 1-3% of polycaprolactone grafted starch nanocrystal, 0.1-0.3% of EDTA-2Na0, and the balance of water.
Preferably, the viscosity reducer for thickened oil recovery comprises the following components in percentage by mass: 20% of zwitterionic surfactant, 5% of di (2-ethylhexyl) phthalate, 4% of maleic anhydride acylated chitosan salt, 2% of polycaprolactone grafted starch nanocrystal, 0.2% of EDTA-2Na and 68.8% of water.
Preferably, the zwitterionic surfactant is lauryl imidazoline betaine, dodecyl dimethyl betaine or decyl hydroxypropyl sulfobetaine.
Preferably, the maleic anhydride acylated chitosan salt is maleic anhydride acylated chitosan sodium.
Preferably, the particle size of the polycaprolactone grafted starch nanocrystal is 50-100 nm.
The second purpose of the invention is to provide a preparation method of the viscosity reducer for thickened oil recovery, which comprises the following steps:
step 1, weighing 15-20% of zwitterionic surfactant, 5-10% of di (2-ethylhexyl) phthalate, 3-5% of maleic anhydride acylated chitosan salt, 1-3% of polycaprolactone grafted starch nanocrystal, 0.1-0.3% of EDTA-2Na0 and the balance of water according to the mass;
step 2, dissolving the maleic anhydride acylated chitosan salt and EDTA-2Na weighed in the step 1 into the water weighed in the step 1 to obtain a mixed aqueous solution;
and 3, adding the zwitterionic surfactant, the di (2-ethylhexyl) phthalate and the polycaprolactone grafted starch nanocrystal weighed in the step 1 into the mixed aqueous solution obtained in the step 2, and dispersing at a high speed to obtain the viscosity reducer for thickened oil recovery.
Preferably, the rotation speed of the high-speed dispersion in the step 3 is 1000-1500r/min, and the dispersion time is 15-30 min.
Preferably, the preparation method of the maleic anhydride acylated chitosan salt is as follows:
dispersing chitosan into water, then alternately adding maleic anhydride and sodium carbonate every 30min under the stirring condition, repeating for 4 times, reacting at room temperature for 6h after the addition is finished, adjusting the pH of reaction liquid to 8-9 after the reaction is finished, filtering to remove unreacted chitosan, dialyzing filtrate to remove small molecular impurities, and then concentrating and drying to obtain the maleic anhydride acylated chitosan salt;
wherein the mass ratio of chitosan, water, maleic anhydride and sodium carbonate is 1: 100: 0.5: 0.5.
preferably, the pH of the reaction solution is adjusted to 8 to 9 by using a sodium hydroxide solution with a mass concentration of 5%.
Compared with the prior art, the invention has the beneficial effects that:
1) the formula of the invention is added with the zwitterionic surfactant, the zwitterionic surfactant is a surfactant which contains both anionic hydrophilic groups and cationic hydrophilic groups in the same molecule, the surfactant is easy to be attached to an oil-water interface, the tension of an adsorption film formed by the oil-water interface is reduced, and the thick oil emulsion at the interface is subjected to phase inversion, so that the thick oil emulsion can be well formed by adding the zwitterionic surfactant into thick oil, the thick oil emulsion with the thick oil as a dispersion phase and water as a continuous phase is formed, even the thick oil and the water form an O/W type emulsion, and the aggregation of oil drops is prevented; because the viscosity of the continuous phase water is lower, the mutual internal friction of the thick oil is changed into the friction between water and water in the flowing process, the flowing resistance is greatly reduced, and the viscosity of the thick oil is reduced.
2) The di (2-ethylhexyl) phthalate is added in the formula, and the di (2-ethylhexyl) phthalate has the characteristics of high permeability and high permeation speed in the system of the invention, can rapidly permeate an adsorption film formed at an oil-water interface, enters a thick oil tissue area, and effectively disperses asphaltenes and colloids in oil; the analysis reason is probably that the phthalic acid di (2-ethylhexyl) ester is a macromolecular substance which contains polar groups and has a symmetrical structure, wherein ester groups contained in the macromolecular substance can react with the polar groups in the colloid and the asphaltene to form an in-situ copolymer, and a space network structure interwoven by the colloid and the asphaltene is broken up; the long-chain alkyl symmetrically distributed in the di (2-ethylhexyl) phthalate can fully extend around the copolymer to form a melting layer of the viscosity reducer, so that a shielding effect is achieved, a non-polar environment is formed at the periphery of the copolymer, and the colloid and the asphalt are prevented from being re-aggregated.
3) According to the invention, the maleic anhydride acylated chitosan sodium and the polycaprolactone grafted starch nanocrystal are added in the formula, under the permeation and dispersion effects of the di (2-ethylhexyl) phthalate, the maleic anhydride acylated chitosan sodium can penetrate through an adsorption film formed at an oil-water interface along with the di (2-ethylhexyl) phthalate, enter between colloid and asphalt flaky molecules, partially disassemble an aggregate formed by plane overlapping and stacking, loosen the structure and reduce the cohesive force of thick oil, under the effects, the di (2-ethylhexyl) phthalate can efficiently react with polar groups in the colloid and the asphaltene to form an in-situ copolymer, and further play a viscosity reduction effect of the di (2-ethylhexyl) phthalate;
the polycaprolactone grafted starch nanocrystal has amphiphilic performance, polar groups are adsorbed on the surfaces of colloid and asphaltene, and hydrophobic groups enter the asphaltene, so that the distribution mode reduces the dipole effect and hydrogen bond effect among asphaltene molecules, reduces the binding capacity of the polycaprolactone grafted starch nanocrystal and prevents the polycaprolactone from reaggregating.
4) EDTA-2Na is added in the formula, and the EDTA-2Na can chelate metal ions encountered in the oil extraction process, so that the metal ions and other raw materials are prevented from acting, and the viscosity reduction performance of other raw materials is influenced.
5) The viscosity reducer prepared by the invention has good viscosity reduction effect and strong practicability, improves the recovery ratio of crude oil, and has wide application prospect.
Detailed Description
In order to make the technical solutions of the present invention better understood and enable those skilled in the art to practice the present invention, the following embodiments are further described, but the present invention is not limited to the following embodiments.
The test methods not specifically mentioned in the following examples were carried out according to the conventional methods and conditions in the art, and the starting materials were commercially available unless otherwise specified.
It should be noted that the preparation method of the polycaprolactone grafted starch nanocrystal of the present invention is made with reference to the paper "preparation of polycaprolactone grafted starch nanocrystal" published in the chemistry report of volume 77, phase 2 in the 2014 of the queen.
Example 1
The viscosity reducer for thickened oil production comprises the following components in parts by mass: 200g of lauryl imidazoline betaine, 50g of di (2-ethylhexyl) phthalate, 40g of maleic anhydride acylated chitosan sodium, 20g of polycaprolactone grafted starch nanocrystal with the particle size of 50nm, 2g of EDTA-2Na and 688g of water.
The preparation method comprises the following steps:
step 1, weighing 200g of lauryl imidazoline betaine, 50g of di (2-ethylhexyl) phthalate, 40g of maleic anhydride acylated chitosan sodium, 20g of polycaprolactone grafted starch nanocrystal, 2g of EDTA-2Na and 688g of water according to the mass respectively;
step 2, dissolving the maleic anhydride acylated chitosan sodium weighed in the step 1 and EDTA-2Na in the water weighed in the step 1 to obtain a mixed water solution;
and 3, adding the lauryl imidazoline betaine, the di (2-ethylhexyl) phthalate and the polycaprolactone grafted starch nanocrystal weighed in the step 1 into the mixed aqueous solution obtained in the step 2, and dispersing at a high speed of 1000r/min for 30min to obtain the viscosity reducer for thickened oil recovery.
Example 2
The viscosity reducer for thickened oil production comprises the following components in parts by mass: 150g of dodecyl dimethyl betaine, 80g of di (2-ethylhexyl) phthalate, 30g of maleic anhydride acylated chitosan sodium, 10g of polycaprolactone grafted starch nanocrystal with the particle size of 80nm, 1g of EDTA-2Na and 729g of water.
The preparation method comprises the following steps:
step 1, weighing 150g of dodecyl dimethyl betaine, 80g of di (2-ethylhexyl) phthalate, 30g of maleic anhydride acylated chitosan sodium, 10g of polycaprolactone grafted starch nanocrystal, 1g of EDTA-2Na and 729g of water according to the mass respectively;
step 2, dissolving the maleic anhydride acylated chitosan sodium weighed in the step 1 and EDTA-2Na in the water weighed in the step 1 to obtain a mixed water solution;
and 3, adding the dodecyl dimethyl betaine, the di (2-ethylhexyl) phthalate and the polycaprolactone grafted starch nanocrystal weighed in the step 1 into the mixed aqueous solution obtained in the step 2, and dispersing at a high speed of 1500r/min for 15min to obtain the viscosity reducer for thickened oil recovery.
Example 3
The viscosity reducer for thickened oil production comprises the following components in parts by mass: 180g of decyl hydroxypropyl sulfobetaine, 100g of di (2-ethylhexyl) phthalate, 50g of maleic anhydride acylated chitosan sodium, 30g of polycaprolactone grafted starch nanocrystal with the particle size of 100nm, 3g of EDTA-2Na and 637g of water.
The preparation method comprises the following steps:
step 1, weighing 180g of decyl hydroxypropyl sulphobetaine, 100g of di (2-ethylhexyl) phthalate, 50g of maleic anhydride acylated chitosan sodium, 30g of polycaprolactone grafted starch nanocrystal, 3g of EDTA-2Na and 637g of water according to the mass;
step 2, dissolving the maleic anhydride acylated chitosan sodium weighed in the step 1 and EDTA-2Na in the water weighed in the step 1 to obtain a mixed water solution;
and 3, adding the decyl hydroxypropyl sulphobetaine, the di (2-ethylhexyl) phthalate and the polycaprolactone grafted starch nanocrystal weighed in the step 1 into the mixed aqueous solution in the step 2, and dispersing at a high speed of 1200r/min for 20min to obtain the viscosity reducer for thickened oil extraction.
The preparation method of the maleic anhydride acylated chitosan salt is as follows:
dispersing chitosan into water, then alternately adding maleic anhydride and sodium carbonate every 30min under the stirring condition, repeating for 4 times, reacting at room temperature for 6h after the addition is finished, adjusting the pH of reaction liquid to 8-9 by using a sodium hydroxide solution with the mass concentration of 5% after the reaction is finished, filtering to remove unreacted chitosan, dialyzing filtrate to remove small molecular impurities, and then concentrating and drying to obtain maleic anhydride acylated chitosan salt;
wherein the mass ratio of chitosan, water, maleic anhydride and sodium carbonate is 1: 100: 0.5: 0.5.
for illustrating the effect, the invention also provides a comparative example which is as follows:
comparative example 1
The viscosity reducer for thickened oil recovery has the same component formula as that in example 1, except that di (2-ethylhexyl) phthalate is not added in the formula in comparative example 1. And the specific preparation method is also the same as that of example 1, except that step 3 of the preparation method does not include the addition step of di (2-ethylhexyl) phthalate.
Comparative example 2
The viscosity reducer for thickened oil recovery has the same component formula as that in example 1, except that no maleic anhydride acylated chitosan sodium is added into the formula in comparative example 2. And the specific preparation method is also the same as that of example 1, except that step 2 of the preparation method does not include the step of adding the maleic anhydride acylated chitosan sodium.
Comparative example 3
The viscosity reducer for thickened oil recovery has the same component formula as that in example 1, except that no polycaprolactone grafted starch nanocrystal is added into the formula in comparative example 3. The specific preparation method is also the same as that of example 1, except that step 3 of the preparation method does not include the step of adding the polycaprolactone grafted starch nanocrystal.
Comparative example 4
The viscosity reducer for thickened oil recovery has the same component formula as that in example 1, except that no maleic anhydride acylated chitosan sodium and polycaprolactone grafted starch nanocrystal is added into the formula in comparative example 4. The specific preparation method is the same as that of example 1, except that step 2 of the preparation method does not include the step of adding maleic anhydride acylated chitosan sodium, and step 3 does not include the step of adding polycaprolactone grafted starch nanocrystal.
Comparative example 5
The viscosity reducer for thickened oil production comprises the following components in parts by mass: 200g of lauryl imidazoline betaine, 2g of EDTA-2Na and 688g of water.
The preparation method comprises the following steps:
step 1, weighing 200g of lauryl imidazoline betaine, 2g of EDTA-2Na and 688g of water according to the mass respectively;
step 2, dissolving the EDTA-2Na weighed in the step 1 into the water weighed in the step 1 to obtain an EDTA-2Na aqueous solution;
and 3, adding the lauryl imidazoline betaine weighed in the step 1 into the EDTA-2Na aqueous solution in the step 2, and dispersing at a high speed of 1000r/min for 30min to obtain the viscosity reducer for thickened oil recovery.
In order to verify the viscosity reducing effect of the viscosity reducer for thickened oil recovery prepared in examples 1-3 and comparative examples 1-5 of the invention, the following tests were carried out.
Viscosity reduction effect on extra-heavy oil
Taking extra-thick oil, wherein the mass content of asphaltene in the extra-thick oil is 23.16%, the viscosity of the extra-thick oil at 50 ℃ is 28580, dividing the extra-thick oil into 8 parts, each part is 500g, one viscosity reducer in the examples 1-3 and the comparative examples 1-5 is respectively added into each part of extra-thick oil, the addition amount of the viscosity reducer is 2.5g, then placing the extra-thick oil into a 50 ℃ water bath kettle, uniformly stirring, keeping the temperature, standing for 60min, and then measuring the viscosity of the extra-thick oil.
Wherein, the viscosity of the extra-thick oil is tested by a Brookfield Ivdv-III type rheometer, each part of the extra-thick oil sample added with the viscosity reducer is parallelly measured for 3 times, an average value is taken, and the viscosity of the oil sample before treatment and the viscosity of the oil sample after treatment are both tested at 50 ℃, and the specific test result is shown in Table 1.
TABLE 1 viscosity reduction Effect of viscosity reducers
Figure GDA0002244808280000091
Figure GDA0002244808280000101
Viscosity reduction effect on super heavy oil
Taking the super-thick oil, wherein the mass content of asphaltene in the super-thick oil is 37.85%, the viscosity of the super-thick oil at 50 ℃ is 73000, dividing the super-thick oil into 8 parts, each part is 500g, one of the viscosity reducers in the examples 1-3 and the comparative examples 1-5 is respectively added into each part of the super-thick oil, the addition amount of the viscosity reducer is 3g, then putting the super-thick oil into a 50 ℃ water bath kettle, uniformly stirring, keeping the temperature, standing for 60min, and then measuring the viscosity of the super-thick oil.
The method for measuring the viscosity of the super-thick oil is the same as the method for measuring the viscosity of the extra-thick oil, and specific test results are shown in table 2.
TABLE 2 viscosity reduction Effect of viscosity reducers
Item Viscosity of oil sample before treatment (mPa.s) Viscosity of oil sample after treatment (mPa.s) Viscosity reduction Rate (%)
Example 1 73000 5400 92.6
Example 2 73000 4960 93.2
Example 3 73000 5320 92.7
Comparative example 1 73000 21680 70.3
Comparative example 2 73000 14670 79.9
Comparative example 3 73000 9920 86.4
Comparative example 4 73000 28320 61.2
Comparative example 5 73000 45180 38.1
As can be seen from tables 1 and 2, the thick oil viscosity reducer prepared in examples 1-3 has good viscosity reducing effect on extra thick oil, super thick oil and thick oil with asphaltene content more than 30%, and the viscosity reducing rate reaches more than 90%;
the viscosity reducing rate of the heavy oil viscosity reducer prepared in the comparative example 1 to extra heavy oil and super heavy oil is about 70%, because the formula of the comparative example 1 does not contain di (2-ethylhexyl) phthalate, the viscosity reducing effect of the di (2-ethylhexyl) phthalate to the whole system is greatly influenced;
the viscosity reducing rate of the heavy oil viscosity reducer prepared in the comparative example 2 on extra heavy oil and super heavy oil is about 80%, and is poorer than that of the thick oil viscosity reducer prepared in the examples 1-3, but better than that of the thick oil viscosity reducer prepared in the comparative example 1, and no maleic anhydride acylated chitosan sodium is added in the comparative example 2, which shows that the maleic anhydride acylated chitosan sodium has certain influence on the viscosity reducing effect of the whole system but has no more influence than that of di (2-ethylhexyl) phthalate;
the viscosity reducing rate of the thick oil viscosity reducer prepared in the comparative example 3 on extra thick oil and super thick oil is more than 85% and less than 90%, the viscosity reducing rate is not much different from that of the thick oil viscosity reducer prepared in the examples 1-3, the effect is better than that of the comparative examples 1-2, and no polycaprolactone grafted starch nanocrystal is added in the comparative example 3, which shows that the polycaprolactone grafted starch nanocrystal has little influence on the viscosity reducing effect of a system;
the viscosity reducing rate of the heavy oil viscosity reducer prepared in the comparative example 4 on extra heavy oil and super heavy oil is 57-61%, and the effect is poorer than that of the comparative examples 1-3, because neither maleic anhydride acylated chitosan sodium nor polycaprolactone grafted starch nanocrystal is added in the formula of the comparative example 4, the two viscosity reducers have a synergistic interaction effect and can be matched with a surfactant and di (2-ethylhexyl) phthalate for viscosity reduction;
the viscosity reducing rate of the thick oil viscosity reducer prepared in the comparative example 5 on extra thick oil and super thick oil is below 50%, the viscosity reducing rate on the super thick oil is only 38.1%, the effect is the worst, the comparative example 5 is equivalent to only containing a surfactant, and the viscosity reducing effect of the surfactant on the whole system is limited, so that the viscosity reducing effect of the simple surfactant is not ideal under the condition of not adding any auxiliary agent.
In conclusion, the components in the heavy oil viscosity reducer have interaction and synergistic interaction, the purpose of reducing the viscosity of extra heavy oil and super heavy oil is achieved together, and the viscosity reducing effect is obvious.
While the present invention has been described with respect to preferred embodiments, additional variations and modifications will occur to those embodiments once the basic inventive concepts are known to those skilled in the art. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims (9)

1. The viscosity reducer for thickened oil recovery is characterized by comprising the following components in percentage by mass: 15-20% of zwitterionic surfactant, 5-10% of di (2-ethylhexyl) phthalate, 3-5% of maleic anhydride acylated chitosan salt, 1-3% of polycaprolactone grafted starch nanocrystal, 0.1-0.3% of EDTA-2Na and the balance of water.
2. The viscosity reducer for thickened oil recovery according to claim 1, which is characterized by comprising the following components in percentage by mass: 20% of zwitterionic surfactant, 5% of di (2-ethylhexyl) phthalate, 4% of maleic anhydride acylated chitosan salt, 2% of polycaprolactone grafted starch nanocrystal, 0.2% of EDTA-2Na and 68.8% of water.
3. The viscosity reducer for thickened oil recovery according to claim 1 or 2, wherein the zwitterionic surfactant is lauryl imidazoline betaine, dodecyl dimethyl betaine or decyl hydroxypropyl sulfobetaine.
4. The viscosity reducer for thickened oil recovery as defined in claim 1 or 2, wherein the chitosan salt acylated with maleic anhydride is sodium chitosan acylate with maleic anhydride.
5. The viscosity reducer for thickened oil recovery as recited in claim 1 or 2, wherein the particle size of the polycaprolactone grafted starch nanocrystal is 50-100 nm.
6. The preparation method of the viscosity reducer for thickened oil recovery according to claim 1, characterized by comprising the following steps:
step 1, weighing 15-20% of zwitterionic surfactant, 5-10% of di (2-ethylhexyl) phthalate, 3-5% of maleic anhydride acylated chitosan salt, 1-2% of polycaprolactone grafted starch nanocrystal, 0.1-0.3% of EDTA-2Na and the balance of water according to the mass;
step 2, dissolving the maleic anhydride acylated chitosan salt and EDTA-2Na weighed in the step 1 into the water weighed in the step 1 to obtain a mixed aqueous solution;
and 3, adding the zwitterionic surfactant, the di (2-ethylhexyl) phthalate and the polycaprolactone grafted starch nanocrystal weighed in the step 1 into the mixed aqueous solution obtained in the step 2, and dispersing at a high speed to obtain the viscosity reducer for thickened oil recovery.
7. The method for preparing viscosity reducer for thickened oil recovery as defined in claim 6, wherein the rotation speed of high-speed dispersion in step 3 is 1000-1500r/min, and the dispersion time is 15-30 min.
8. The preparation method of the viscosity reducer for thickened oil recovery according to claim 6, wherein the preparation method of the maleic anhydride acylated chitosan salt is as follows:
dispersing chitosan into water, then alternately adding maleic anhydride and sodium carbonate every 30min under the stirring condition, repeating for 4 times, reacting at room temperature for 6h after the addition is finished, adjusting the pH of reaction liquid to 8-9 after the reaction is finished, filtering to remove unreacted chitosan, dialyzing filtrate to remove small molecular impurities, and then concentrating and drying to obtain the maleic anhydride acylated chitosan salt;
wherein the mass ratio of chitosan, water, maleic anhydride and sodium carbonate is 1: 100: 0.5: 0.5.
9. the method for preparing the viscosity reducer for thickened oil recovery according to claim 8, wherein the pH of the reaction solution is adjusted to 8-9 by using a sodium hydroxide solution with a mass concentration of 5%.
CN201910282853.1A 2019-04-10 2019-04-10 Viscosity reducer for thickened oil production and preparation method thereof Active CN109868129B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201910282853.1A CN109868129B (en) 2019-04-10 2019-04-10 Viscosity reducer for thickened oil production and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201910282853.1A CN109868129B (en) 2019-04-10 2019-04-10 Viscosity reducer for thickened oil production and preparation method thereof

Publications (2)

Publication Number Publication Date
CN109868129A CN109868129A (en) 2019-06-11
CN109868129B true CN109868129B (en) 2020-01-21

Family

ID=66922284

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201910282853.1A Active CN109868129B (en) 2019-04-10 2019-04-10 Viscosity reducer for thickened oil production and preparation method thereof

Country Status (1)

Country Link
CN (1) CN109868129B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110669491A (en) * 2019-10-24 2020-01-10 无棣荣业网具有限公司 High-dispersity thick oil viscosity reducer and preparation method thereof
CN116285929A (en) * 2021-12-08 2023-06-23 天津大港油田滨港集团博弘石油化工有限公司 Water-based thickened oil viscosity reducer and preparation method thereof

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101768462A (en) * 2008-12-31 2010-07-07 中国石油化工股份有限公司 Emulsifying and viscosity-decreasing method of thick oil
CN106536672A (en) * 2014-05-26 2017-03-22 I·A·伊松萨瑞布雷杜 Oil-based compositions for dispersing asphaltenes and paraffins

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10759989B2 (en) * 2016-01-06 2020-09-01 Ecolab Usa Inc. Temperature-stable paraffin inhibitor compositions

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101768462A (en) * 2008-12-31 2010-07-07 中国石油化工股份有限公司 Emulsifying and viscosity-decreasing method of thick oil
CN106536672A (en) * 2014-05-26 2017-03-22 I·A·伊松萨瑞布雷杜 Oil-based compositions for dispersing asphaltenes and paraffins

Also Published As

Publication number Publication date
CN109868129A (en) 2019-06-11

Similar Documents

Publication Publication Date Title
CN109868129B (en) Viscosity reducer for thickened oil production and preparation method thereof
Giménez-Marqués et al. Unravelling the chemical design of spin-crossover nanoparticles based on iron (II)–triazole coordination polymers: towards a control of the spin transition
CN105060307B (en) A kind of high-specific surface area white carbon and its production method
CN111944507B (en) Nano active agent system and preparation method and application thereof
CN107033867B (en) Nano-cellulose and viscoelastic surfactant composite fracturing fluid and preparation method and application thereof
CN103588886B (en) A kind of Easily-water dispersible nanocrystalline cellulose and preparation method thereof
CN110669489B (en) Low-power depolymerization emulsification viscosity reducer for cold production of thick oil and preparation method thereof
CN103113862B (en) Amphoteric ionic ultra-high-temperature polysulfonate drilling fluid
CN104478238A (en) Bentonite-based mineral gel and preparation method thereof
CN110452677A (en) One kind is based on modified MoS2The method for preparing drag reducer
CN104368824A (en) Method for manufacturing gold-solver alloy nanometer particles through sugarcane extract
CN111440604B (en) Self-demulsification type salt-resistant heavy oil cold recovery oil-displacing agent and preparation method and application thereof
CN104927799A (en) Carbon nano-tube complex thickener and preparation method thereof
CN117903774B (en) Antihypertensive injection-increasing active agent and preparation method and application thereof
CN112239653B (en) Fluid loss additive for drilling fluid based on nanofiber-hydrophobic starch compound and preparation method thereof
DE69023573T2 (en) Aqueous hydroxyethyl cellulose suspension.
Wang et al. Synthesis and properties of organoboron functionalized nanocellulose for crosslinking low polymer fracturing fluid system
CN109913186B (en) Petroleum drilling auxiliary and preparation method thereof
CN110439517B (en) Oil displacement method suitable for heavy oil reservoir
CN107523280A (en) A kind of thickening filtrate reducing complexing agent for seawater mud and preparation method thereof
CN102093872A (en) Clean fracturing fluid applied to hydraulic fracturing production increasing technology of oil-gas well
CN104559972A (en) Microcrack micro-nano plugging material for drilling and preparation method
CN110257041B (en) Guar gum-nano cellulose fiber crosslinking thickener for fracturing fluid and preparation method thereof
CN115368882B (en) Phase permeation regulator for oil field and preparation method thereof
CN112239658A (en) Fluid loss additive for drilling fluid based on nanofiber-chitosan compound and preparation method thereof

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant