CN114315937A - Biomass nanometer permeation enhancer for pressure flooding and fracturing and preparation method and application thereof - Google Patents
Biomass nanometer permeation enhancer for pressure flooding and fracturing and preparation method and application thereof Download PDFInfo
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Abstract
The invention discloses a biomass nano permeation enhancer for pressure flooding and fracturing as well as a preparation method and application thereof, belongs to the technical field of exploitation of pressure flooding and fracturing oil gas resources, and solves the technical problems of weak permeation enhancer capability, serious pollution and the like of most of permeation enhancers applied to the field of exploitation of pressure flooding and fracturing of oil gas resources at present. During preparation, sucrose is dissolved in water, a solvent of ethyl acetate and an acid-binding agent are added, phosphorus oxychloride is slowly dripped at low temperature, the temperature is controlled after the dripping is finished, the reaction is continuously reacted for a period of time, and after the reaction is finished, the reaction solution is concentrated, purified, separated and dried in vacuum to obtain the biomass nano permeation enhancer for pressure flooding and fracturing. The biomass nano permeation enhancer can decompose phosphoric acid and cane sugar at high temperature, can fully permeate into a stratum environment, produces a water-wet environment which is an environment that the resistance is reduced when an aqueous solution advances in a stratum micropore environment, has good temperature resistance and high permeation rate, and is nontoxic and biodegradable.
Description
Technical Field
The invention belongs to the technical field of exploitation of pressure flooding and fracturing oil and gas resources, and particularly relates to a biomass nano permeation enhancer for pressure flooding and fracturing as well as a preparation method and application thereof.
Background
The development of unconventional hydrocarbons has made major breakthroughs over the last decade, with the most representative technology being a combination of hydraulic fracturing and horizontal drilling technologies. Nevertheless, the amount of crude oil that can be produced by depletion mode exploitation relying on natural energy is still low, and there is still a large amount of remaining oil available for production in tight reservoirs. However, the unconventional oil and gas has low overall resource grade, compact reservoir stratum, complex geological structure and low porosity and permeability, and the characteristics greatly influence the exploitation efficiency of oil and gas resources.
The primary flow path of unconventional hypotonic reservoirs is fractures, and therefore, produced (or injected) fluids mostly flow through hydraulic fracturing fractures, and the production of hydrocarbons is mostly confined to the hypotonic reservoir near the fracture network. In recent years, various chemical components such as surfactants and the like are often added in the fracturing process, the synthesized nano permeability-increasing agent is added into fracturing fluid pad fluid, the stratum is fractured into a plurality of cracks by utilizing the fracturing fluid, and the nano permeability-increasing agent enters larger crack pores of the stratum under the surplus pressure of fracturing. However, most permeability enhancers applied to the fields of oil and gas resource exploitation, pressure flooding and fracturing at present have the problems of weak permeability enhancing capability, serious pollution and the like.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a biomass nano permeability enhancer for pressure flooding and fracturing as well as a preparation method and application thereof, which are used for solving the technical problems of weak permeability enhancing capability, serious pollution and the like of the permeability enhancer in the field of exploitation of most of oil and gas resources and fracturing at present.
In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:
the invention discloses a biomass nano permeation enhancer for pressure flooding and fracturing, which has the following structural formula:
the invention also discloses a preparation method of the biomass nano permeation enhancer for pressure flooding and fracturing, which comprises the following steps:
dissolving sucrose in water, adding ethyl acetate and an acid-binding agent to form a mixed solution, dropwise adding phosphorus oxychloride into the mixed solution to react, controlling the temperature to continue the reaction after the dropwise adding is finished, obtaining a reaction solution after the reaction is finished, and concentrating, purifying and separating the reaction solution, and drying in vacuum to obtain the biomass nano permeation enhancer for pressure flooding and fracturing.
Further, the reaction time of dropwise adding phosphorus oxychloride into the mixed solution for reaction is 0.5-1 h.
Further, after the dropwise addition is finished, the temperature is controlled to be 25-35 ℃, and the reaction time for continuous reaction is 4-6 hours.
Further, the purification and separation method is a toluene column chromatography method.
Furthermore, the molar ratio of the sucrose to the phosphorus oxychloride to the water is 1 (4-4.3) to 10-15.
Further, the molar ratio of the phosphorus oxychloride to the acid-binding agent is 1 (2-3); the acid-binding agent is triethylamine.
Further, the adding amount of the ethyl acetate is 3-8 times of the total mass of the sucrose, the phosphorus oxychloride and the water.
The invention also discloses an application of the biomass nano permeability-increasing agent for pressure flooding and fracturing, and the biomass nano permeability-increasing agent for pressure flooding and fracturing is used as a chemical agent in the pressure flooding or fracturing process of oil and gas resource exploitation.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a biomass nano permeation enhancer for pressure flooding and fracturing, which adopts cane sugar and phosphorus oxychloride as main raw materials to synthesize the biomass nano permeation enhancer with a specific structure. According to the relevant experiment result table, the biomass nano permeation enhancer for pressure flooding and fracturing can decompose phosphoric acid at high temperature and erode cracks so as to further increase the permeability; meanwhile, cane sugar can be decomposed and can fully permeate into a stratum environment, and a water-wet environment is produced, namely the resistance is reduced when the aqueous solution advances in the stratum micropore environment; in addition, the biomass nano permeability increasing agent for pressure flooding and fracturing has good temperature resistance, no biotoxicity, biodegradability, environmental friendliness and high permeability increasing capability, and is a biomass nano permeability increasing agent for pressure flooding and fracturing with excellent functions.
The invention also discloses a preparation method of the biomass nano permeation enhancer for the pressure flooding and fracturing, the method is simple to operate, only simple mixing reaction is needed, no extra large-scale instrument is needed, the used reagent is non-toxic and harmless, environment-friendly, good in economic benefit, capable of realizing large-scale production and wide in application prospect.
The invention also discloses the application of the biomass nano permeability-increasing agent for pressure flooding and fracturing as a chemical agent in the pressure flooding or fracturing process of oil and gas resource exploitation, and the biomass nano permeability-increasing agent for pressure flooding and fracturing can decompose phosphoric acid and cane sugar at high temperature, so that the biomass nano permeability-increasing agent has high permeability-increasing capability and high permeability-absorbing capability, and the manufactured water-wet environment is the advancing resistance reduction of an aqueous solution in a stratum micropore environment, has good temperature resistance, is non-toxic and non-radioactive, can effectively solve the technical problems of weak permeability-increasing capability, serious pollution and the like of the permeability-increasing agent in the field of exploitation pressure flooding and fracturing of the existing oil and gas resources, and has wide application prospect.
Drawings
Fig. 1 is a synthesis and application mechanism diagram of the biomass nano permeability enhancer for pressure flooding and fracturing disclosed by the invention.
Detailed Description
To make the features and effects of the present invention comprehensible to those skilled in the art, general description and definitions are made below with reference to terms and expressions mentioned in the specification and claims. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
The theory or mechanism described and disclosed herein, whether correct or incorrect, should not limit the scope of the present invention in any way, i.e., the present disclosure may be practiced without limitation to any particular theory or mechanism.
All features defined herein as numerical ranges or percentage ranges, such as values, amounts, levels and concentrations, are for brevity and convenience only. Accordingly, the description of numerical ranges or percentage ranges should be considered to cover and specifically disclose all possible subranges and individual numerical values (including integers and fractions) within the range.
Unless otherwise specified herein, "comprising," including, "" containing, "" having, "or the like, means" consisting of … … "and" consisting essentially of … …, "e.g.," a comprises a "means" a comprises a and the other, "and" a comprises a only.
In this context, for the sake of brevity, not all possible combinations of features in the various embodiments or examples are described. Therefore, the respective features in the respective embodiments or examples may be arbitrarily combined as long as there is no contradiction between the combinations of the features, and all the possible combinations should be considered as the scope of the present specification.
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and such equivalents may fall within the scope of the present invention as defined in the appended claims.
The following examples use instrumentation conventional in the art. The experimental procedures, in which specific conditions are not noted in the following examples, are generally carried out under conventional conditions or conditions recommended by the manufacturers. The various starting materials used in the examples which follow, unless otherwise indicated, are conventional commercial products having specifications which are conventional in the art. In the description of the present invention and the following examples, "%" represents weight percent, "parts" represents parts by weight, and proportions represent weight ratios, unless otherwise specified.
The invention discloses a biomass nano permeation enhancer for pressure flooding and fracturing and a preparation method and application thereof, wherein the biomass nano permeation enhancer for pressure flooding and fracturing has the following structural formula:
FIG. 1 shows a synthesis and application mechanism diagram of the biomass nano permeation enhancer for pressure flooding and fracturing, disclosed by the invention, during preparation, a certain amount of sucrose is dissolved in water, then a solvent ethyl acetate and an acid-binding agent triethylamine are added, phosphorus oxychloride is slowly dripped under an ice bath condition, and the control time is 0.5-1 h. After the dropwise addition is finished, the reaction temperature is controlled to be 25-35 ℃, and the reaction lasts for 4-6 hours. The molar ratio of the sucrose to the phosphorus oxychloride to the water is 1 (4-4.3) to 10-15, the molar ratio of the phosphorus oxychloride to the acid-binding agent triethylamine is 1 (2-3), and the addition amount of the solvent ethyl acetate is 3-8 times of the total mass of the sucrose, the phosphorus oxychloride and the water. After the reaction is finished, concentrating the reaction solution, purifying and separating the product by using a toluene column chromatography, and drying in vacuum until the weight is constant to obtain the final product, namely the biomass nano permeation enhancer for pressure flooding and fracturing.
The biomass nano permeation enhancer for pressure flooding and fracturing can decompose phosphoric acid at high temperature to erode cracks so as to further increase the permeability; the decomposed cane sugar can fully permeate into the stratum environment, and the produced water-wet environment is a water solution which can reduce resistance when advancing in the stratum micropore environment, has good temperature resistance, has no biotoxicity and can be biodegraded, so that the environment-friendly biological nanometer permeation enhancer is environment-friendly and is a biomass nanometer permeation enhancer for pressure flooding and fracturing with excellent functions.
The specific decomposition reaction equation is as follows:
example 1
A preparation method of a biomass nano permeability-increasing agent for pressure flooding and fracturing comprises the following steps:
17.1g of sucrose is dissolved in 10.8g of water, then 296.5g of solvent ethyl acetate and 45.6g of acid-binding agent triethylamine are added to form a mixed solution, 31.4g of phosphorus oxychloride is slowly dropped into the mixed solution under the ice bath condition for reaction, and the reaction time is controlled to be 1 h. And after the dropwise addition is finished, controlling the reaction temperature to be 25 ℃, continuously reacting for 6 hours to obtain a reaction solution after the reaction is finished, concentrating the reaction solution, purifying and separating a product by using a toluene column chromatography, and drying in vacuum until the weight is constant to obtain a final product, namely the biomass nano permeation enhancer for pressure flooding and fracturing.
Example 2
A preparation method of a biomass nano permeability-increasing agent for pressure flooding and fracturing comprises the following steps:
20.5g of sucrose is dissolved in 15.1g of water, then 300.0g of ethyl acetate solvent and 54.7g of triethylamine acid-binding agent are added to form a mixed solution, 37.7g of phosphorus oxychloride is slowly dropped into the mixed solution under the ice bath condition for reaction, and the reaction time is controlled to be 0.8 h. And after the dropwise addition is finished, controlling the reaction temperature to be 30 ℃, continuously reacting for 6 hours to obtain a reaction solution after the reaction is finished, concentrating the reaction solution, purifying and separating a product by using a toluene column chromatography, and drying in vacuum until the weight is constant to obtain a final product, namely the biomass nano permeation enhancer for pressure flooding and fracturing.
Example 3
A preparation method of a biomass nano permeability-increasing agent for pressure flooding and fracturing comprises the following steps:
dissolving 13.7g of sucrose in 10.0g of water, adding 320.0g of solvent ethyl acetate and 36.5g of acid-binding agent triethylamine to form a mixed solution, slowly dropwise adding 25.1g of phosphorus oxychloride into the mixed solution under the ice bath condition for reaction, and controlling the reaction time to be 0.5 h. And after the dropwise addition is finished, controlling the reaction temperature to be 35 ℃, continuously reacting for 4 hours to obtain a reaction solution after the reaction is finished, concentrating the reaction solution, purifying and separating a product by using a toluene column chromatography, and drying in vacuum until the weight is constant to obtain a final product, namely the biomass nano permeation enhancer for pressure flooding and fracturing.
Example 4
A preparation method of a biomass nano permeability-increasing agent for pressure flooding and fracturing comprises the following steps:
dissolving 18.8g of sucrose in 13.8g of water, then adding 204.0g of solvent ethyl acetate and 58.3g of acid-binding agent triethylamine to form a mixed solution, slowly dropwise adding 35.3g of phosphorus oxychloride into the mixed solution under the ice bath condition for reaction, and controlling the reaction time to be 1 h. And after the dropwise addition is finished, controlling the reaction temperature to be 30 ℃, continuously reacting for 5 hours to obtain a reaction solution after the reaction is finished, concentrating the reaction solution, purifying and separating a product by using a toluene column chromatography, and drying in vacuum until the weight is constant to obtain a final product, namely the biomass nano permeation enhancer for pressure flooding and fracturing.
Example 5
A preparation method of a biomass nano permeability-increasing agent for pressure flooding and fracturing comprises the following steps:
23.9g of sucrose is dissolved in 17.6g of water, 341.6g of ethyl acetate solvent and 72.5g of triethylamine acid-binding agent are added to form a mixed solution, 43.9g of phosphorus oxychloride is slowly dropped into the mixed solution under the ice bath condition for reaction, and the reaction time is controlled to be 0.8 h. And after the dropwise addition is finished, controlling the reaction temperature to be 25 ℃, continuously reacting for 6 hours to obtain a reaction solution after the reaction is finished, concentrating the reaction solution, purifying and separating a product by using a toluene column chromatography, and drying in vacuum until the weight is constant to obtain a final product, namely the biomass nano permeation enhancer for pressure flooding and fracturing.
In order to characterize various performances of the biomass nano permeability enhancer for pressure flooding and fracturing, the interfacial tension, the wettability, the self-absorption capability and the core permeability of the biomass nano permeability enhancer for pressure flooding and fracturing synthesized in the embodiments 1-5 were tested, and the results are shown in table 1. As can be seen from Table 1, the biomass nano permeability enhancer for pressure flooding and fracturing has low interfacial tension and can play a role in wetting, and a 0.3% aqueous solution has obvious capillary self-absorption capacity. The rock core is soaked at 80 ℃, and the permeability of the rock core is obviously improved, because the biomass nano permeability enhancer can decompose phosphoric acid at high temperature and erode cracks, so that the permeability is further improved. The comprehensive evaluation is a biomass nano permeation enhancer with excellent functions for pressure flooding and fracturing.
Wherein the test reference standard is:
the interfacial tension refers to the measurement of the interfacial tension of the surfactant of GB/T38722-;
the wettability test refers to a measuring method (immersion method) of the wetting power of a GB/T11983-2008 surfactant;
self-priming capability reference JB/T6664.3-2004 self-priming Pump part 3 self-priming Performance test method;
core permeability was determined by the SY/T5802-1993 tight rock permeability assay (steady state method).
TABLE 1 Performance of Biomass Nano permeability-increasing agent for pressure flooding and fracturing
The above-mentioned contents are only for illustrating the technical idea of the present invention, and the protection scope of the present invention is not limited thereby, and any modification made on the basis of the technical idea of the present invention falls within the protection scope of the claims of the present invention.
Claims (9)
1. The biomass nano permeability-increasing agent for pressure flooding and fracturing is characterized by having the following structural formula:
2. the preparation method of the biomass nano permeability enhancer for the pressure flooding and fracturing, which is characterized by comprising the following steps:
dissolving sucrose in water, adding ethyl acetate and an acid-binding agent to form a mixed solution, dropwise adding phosphorus oxychloride into the mixed solution to react, controlling the temperature to continue the reaction after the dropwise adding is finished, obtaining a reaction solution after the reaction is finished, and concentrating, purifying and separating the reaction solution, and drying in vacuum to obtain the biomass nano permeation enhancer for pressure flooding and fracturing.
3. The preparation method of the biomass nano permeability enhancer for pressure flooding and fracturing as claimed in claim 2, wherein the reaction time of dropping phosphorus oxychloride into the mixed solution for reaction is 0.5-1 h.
4. The preparation method of the biomass nano permeability-increasing agent for pressure flooding and fracturing as claimed in claim 2, wherein the temperature is controlled to be 25-35 ℃ after the dropwise addition is completed, and the reaction time for the continuous reaction is 4-6 h.
5. The preparation method of the biomass nano permeability-increasing agent for pressure flooding and fracturing as claimed in claim 2, wherein the purification and separation method is toluene column chromatography.
6. The preparation method of the biomass nano permeability-increasing agent for pressure flooding and fracturing as claimed in claim 2, wherein the molar ratio of the sucrose, the phosphorus oxychloride and the water is 1 (4-4.3) to (10-15).
7. The preparation method of the biomass nano permeability-increasing agent for pressure flooding and fracturing as claimed in claim 2, wherein the molar ratio of the phosphorus oxychloride to the acid-binding agent is 1 (2-3); the acid-binding agent is triethylamine.
8. The preparation method of the biomass nano permeability enhancer for pressure flooding and fracturing as claimed in claim 2, wherein the addition amount of the ethyl acetate is 3-8 times of the total amount of sucrose, phosphorus oxychloride and water.
9. The application of the biomass nano permeability-increasing agent for pressure flooding and fracturing, which is described in claim 1, is used as a chemical agent in the pressure flooding or fracturing process of oil and gas resource exploitation.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140308209A1 (en) * | 2011-11-15 | 2014-10-16 | The Walter And Eliza Hall Institute Of Medical Research | Soluble Mediator |
| CN105860948A (en) * | 2015-05-25 | 2016-08-17 | 成都能生材科技开发有限责任公司 | Preparation method of polymer viscosity-reducing profile-control resistance-reducing physical dissolution agent PSR |
| CN111022011A (en) * | 2019-12-03 | 2020-04-17 | 中国石油化工股份有限公司 | Construction method of foamable resin sand consolidation agent for argillaceous fine silt oil reservoir |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140308209A1 (en) * | 2011-11-15 | 2014-10-16 | The Walter And Eliza Hall Institute Of Medical Research | Soluble Mediator |
| CN105860948A (en) * | 2015-05-25 | 2016-08-17 | 成都能生材科技开发有限责任公司 | Preparation method of polymer viscosity-reducing profile-control resistance-reducing physical dissolution agent PSR |
| CN111022011A (en) * | 2019-12-03 | 2020-04-17 | 中国石油化工股份有限公司 | Construction method of foamable resin sand consolidation agent for argillaceous fine silt oil reservoir |
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Effective date of registration: 20220525 Address after: 745112 Fucheng street, sanliupu Town, Qingcheng County, Qingyang City, Gansu Province Applicant after: Gansu Zhilun New Material Technology Co.,Ltd. Address before: 710021 Shaanxi province Xi'an Weiyang University Park Applicant before: SHAANXI University OF SCIENCE & TECHNOLOGY |