CN114181685A - Water-flooding thickened oil viscosity self-emulsifying profile control system and preparation method and application thereof - Google Patents
Water-flooding thickened oil viscosity self-emulsifying profile control system and preparation method and application thereof Download PDFInfo
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- 239000003995 emulsifying agent Substances 0.000 claims abstract description 10
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- 239000013543 active substance Substances 0.000 claims abstract description 9
- 239000002086 nanomaterial Substances 0.000 claims abstract description 6
- 230000002209 hydrophobic effect Effects 0.000 claims abstract description 5
- 239000002904 solvent Substances 0.000 claims abstract description 5
- 239000002994 raw material Substances 0.000 claims abstract description 4
- 239000012190 activator Substances 0.000 claims abstract description 3
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- 239000000243 solution Substances 0.000 claims description 16
- 239000007788 liquid Substances 0.000 claims description 12
- 238000011084 recovery Methods 0.000 claims description 12
- 239000007864 aqueous solution Substances 0.000 claims description 10
- 239000003795 chemical substances by application Substances 0.000 claims description 9
- 229920002401 polyacrylamide Polymers 0.000 claims description 8
- 230000033558 biomineral tissue development Effects 0.000 claims description 6
- 238000002347 injection Methods 0.000 claims description 6
- 239000007924 injection Substances 0.000 claims description 6
- -1 anhydride compounds Chemical class 0.000 claims description 4
- JRBPAEWTRLWTQC-UHFFFAOYSA-N dodecylamine Chemical compound CCCCCCCCCCCCN JRBPAEWTRLWTQC-UHFFFAOYSA-N 0.000 claims description 4
- PYIDGJJWBIBVIA-UYTYNIKBSA-N lauryl glucoside Chemical compound CCCCCCCCCCCCO[C@@H]1O[C@H](CO)[C@@H](O)[C@H](O)[C@H]1O PYIDGJJWBIBVIA-UYTYNIKBSA-N 0.000 claims description 4
- 229940048848 lauryl glucoside Drugs 0.000 claims description 4
- 239000011259 mixed solution Substances 0.000 claims description 4
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 4
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 3
- 125000004209 (C1-C8) alkyl group Chemical group 0.000 claims description 2
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Abstract
The application discloses a water flooding thickened oil viscosity self-emulsifying profile control system and a preparation method and application thereof, wherein the profile control system comprises the following components in parts by weight: 4-16 parts of an active agent; emulsifier: 3-12 parts; polymer (b): 6-9 parts of a solvent; the activator is obtained by polymerizing raw materials containing double-bond modified lamellar nano materials, hydrophilic monomers and hydrophobic monomers. The profile control and flooding system has certain viscosity, and can enlarge the swept volume of the injected fluid; under the low-shear condition of reservoir seepage, the thick oil can be well emulsified, the fluidity of the thick oil is improved, and the oil washing effect is enhanced; meanwhile, the O/W emulsion formed by self-emulsification plays a role in profile control and flooding. Multiple mechanisms act together, the limitation of water-flooding heavy oil can be overcome, and efficient exploitation of common heavy oil reservoirs is realized.
Description
Technical Field
The application relates to a water-flooding thickened oil viscosity self-emulsifying profile control system and a preparation method and application thereof, belonging to the field of oilfield chemistry.
Background
At present, partial oil fields in China enter the middle and later stages of water injection development, most of water-drive recoverable reserves are produced, the yield of crude oil is sharply reduced, and various new oil extraction technologies and unconventional oil and gas resources are more and more valued by people. The thick oil resource is widely distributed in China and has huge development potential, and the thick oil resource is put into large-scale development in several domestic oil fields at present.
The heavy oil has high viscosity and poor fluidity, which causes great difficulty in exploiting heavy oil reservoirs. The problems of high water content of produced liquid, low oil production, poor exploitation effect and the like exist in the development of a common heavy oil reservoir, and the main reasons are as follows: in the water-flooding exploitation process, the mobility ratio of injected water to thickened oil is large, the fingering is serious, an oil well quickly sees water, the water injection sweep efficiency is low, a large amount of thickened oil in a reservoir is not used, and the recovery ratio is low; secondly, in the conventional chemical flooding exploitation process, the thick oil is difficult to be effectively emulsified under the stratum power condition, the formed emulsion has uneven particle size, is easy to coalesce, and has poor viscosity reduction effect and poor oil washing effect. The two problems can be solved by a profile control flooding technology and a heavy oil self-emulsifying viscosity reduction oil displacement technology, and the exploitation effect of a common heavy oil reservoir is improved.
The profile control technology is to inject fluid with certain viscosity into an injection well, and reduce fingering phenomenon by reducing the water-oil mobility ratio in the displacement process, thereby enlarging sweep and improving recovery ratio. The technology is used as an important technical measure for improving the water drive development effect and controlling water and stabilizing oil to realize the stable yield of the oil reservoir, can economically and effectively adjust and improve the heterogeneity of the oil reservoir, and makes an important contribution to the continuous stable yield and high yield of the water drive oil field.
The self-emulsifying viscosity-reducing oil displacing technology for heavy oil is one new kind of heavy oil exploiting technology and is used mainly in exploiting common heavy oil reservoir. Depending on stratum seepage, the injected fluid can generate self-emulsification with underground thick oil, or the water-in-oil type emulsion is converted into the oil-in-water type emulsion, so that the viscosity of the thick oil is greatly reduced, and the fluidity of the thick oil in the stratum is enhanced, thereby improving the recovery ratio of the thick oil, the oil extraction rate and the comprehensive economic benefit. The technology is considered to be an ideal and promising method for increasing the recovery ratio.
At present, a certain research is carried out on a viscous self-emulsifying profile control system of water flooding thickened oil, and the following defects are mainly existed:
at present, most of self-emulsifying viscosity reducers for thick oil realize self-emulsification by adding alkali or increasing the dosage of a surfactant, the problems of reservoir damage and scaling caused by adding alkali exist, and the cost is increased by increasing the dosage of the surfactant.
Self-emulsifying profile control, namely the O/W emulsion drops formed in the reservoir seepage process are blocked when flowing to a large pore passage and a high-permeability layer, the seepage resistance is increased due to the Jamin effect, the displacement path of the injected fluid is changed and enters a previous unswept area, and thus the swept area is enlarged. This approach requires that the size of the emulsion droplets formed be matched to the size of the reservoir pores and that a certain amount of emulsion droplets be formed before it can be effective.
Disclosure of Invention
The invention provides a viscosity self-emulsifying profile control system suitable for water flooding thickened oil, and the use liquid of the profile control system has certain viscosity, so that the swept volume of injected fluid can be enlarged; under the low-shear condition of reservoir seepage, the thick oil can be well emulsified, the fluidity of the thick oil is improved, and the oil washing effect is enhanced; meanwhile, the O/W emulsion formed by self-emulsification plays a role in profile control and flooding. Multiple mechanisms act together, the limitation of water-flooding heavy oil can be overcome, and efficient exploitation of common heavy oil reservoirs is realized.
The invention provides a water-flooding thickened oil viscosity self-emulsifying profile control system, which comprises the following components in parts by weight:
active agent(s): 4-16 parts of a solvent;
emulsifier: 3-12 parts;
polymer (b): 6-9 parts of a solvent;
the activator is obtained by polymerizing raw materials containing double-bond modified lamellar nano materials, hydrophilic monomers and hydrophobic monomers; the preparation method of the active agent is prepared according to the preparation method in the patent document with the application number of 202110616616.1.
The hydrophilic monomer is selected from at least one of anhydride compounds;
the hydrophobic monomer is selected from at least one of long-chain alkyl allyl quaternary ammonium salt;
the double-bond modified lamellar nano material is provided with at least one of modification groups shown as a formula I;
wherein R is1Selected from any one of C1-C4 alkylene, R2Any one selected from C1-C8 alkyl;
the emulsifier is selected from one or more of lauryl glucoside and laurylamine polyoxyethylene ether;
the polymer is selected from one or more of polyacrylamide and polyepithelizing agent.
Alternatively, the upper limit on the parts by weight of the active agent may be independently selected from 6 parts, 10 parts, 12 parts, 16 parts; the lower limit can be independently selected from 4 parts, 6 parts, 10 parts and 12 parts;
the upper limit of the weight portion of the emulsifier can be independently selected from 6 portions, 9 portions and 12 portions; the lower limit can be independently selected from 3 parts, 6 parts and 9 parts;
the upper limit of the weight portion of the polymer can be independently selected from 7 parts, 8 parts and 9 parts; the lower limit can be independently selected from 6 parts, 7 parts and 8 parts;
in the application, the high-efficiency active agent has better oil-water interfacial activity due to the introduction of functional groups, and crude oil can be stripped from an interface under weak disturbance through the actions of reducing interfacial tension, drawing oil on the interface, squeezing oil and the like, so that the oil washing efficiency is obviously improved; the high-efficiency emulsifier can quickly emulsify crude oil stripped from an interface, under the natural shearing action of a reservoir porous medium, the stripping action and the emulsifying action are mutually cooperated, and finally, the oil is emulsified into uniform O/W emulsion droplets, so that higher emulsifying efficiency is shown; the addition of the polymer can make the prepared using liquid have certain viscosity, improve the water-oil fluidity ratio, weaken the phenomena of fingering, tongue feeding and the like, and mainly play a role in profile control and flooding.
Reagent that this application will have different efficiency is mixed and is dissolved, makes water drive viscous crude oil viscosity from emulsifying and transfers and drives system use liquid, and fluid self viscosity and the emulsion that forms from emulsifying all have the profile control effect on the one hand, and crude oil can be fully emulsified under weak stratum seepage disturbance on the other hand, and viscosity reduces, and mobility reinforcing, the efficiency of washing oil improves. The dual functions of profile control and oil washing lead to the great reduction of the saturation of residual oil, and finally higher crude oil recovery ratio is realized.
In another aspect of the present application, there is provided a method for preparing the above-mentioned water flooding thickened oil viscosity self-emulsifying profile control agent, the method comprising: and preparing a mixed solution of the active agent and the emulsifier, and matching with the polymer solid particles to prepare a solution with a certain viscosity, namely the water-flooding thickened oil viscosity self-emulsifying profile control system.
Optionally, the weight ratio of the mixed solution to the polymer is (7-28): 6-9.
Optionally, the upper limit of the weight ratio of the mixed solution to the polymer is independently selected from 7:6, 12:9, 16:9, 12:6, 20:9, 16:6, 20:6, 24:9, 28:9, 24: 6. 28: 6; the lower limits are independently selected from 7:9, 7:6, 12:9, 16:9, 12:6, 20:9, 16:6, 20:6, 24:9, 28:9, 24: 6.
in another aspect of the application, an application of the water-flooding thickened oil viscosity self-emulsifying profile control system obtained by the preparation method or the water-flooding thickened oil viscosity self-emulsifying profile control system obtained by the preparation method in thickened oil recovery is provided.
Optionally, the use temperature of the water flooding thickened oil viscosity self-emulsifying profile control system is 35-75 ℃;
alternatively, the upper limit of the using temperature of the water flooding thickened oil viscosity self-emulsifying profile control system can be independently selected from 40 ℃, 50 ℃, 60 ℃, 70 ℃ and 75 ℃; the lower limit is independently selected from 35, 40 deg.C, 50 deg.C, 60 deg.C, 70 deg.C.
Optionally, the viscosity of the thickened oil under reservoir conditions is between 120 and 2000 mPa-s;
alternatively, the upper viscosity limit of the thickened oil at reservoir conditions can be independently selected from 130 mPa-s, 150 mPa-s, 200 mPa-s, 500 mPa-s, 800 mPa-s, 1000 mPa-s, 1500 mPa-s, 2000 mPa-s; the lower limit is independently selected from the group consisting of 120 mPas, 130 mPas, 150 mPas, 200 mPas, 500 mPas, 800 mPas, 1000 mPas and 1500 mPas.
Optionally, the applying comprises: preparing a water-drive thickened oil viscosity self-emulsifying profile control system into an aqueous solution, and injecting the aqueous solution, wherein the concentration of the aqueous solution is 0.3-0.5 wt%; the injection speed is 0.1mL/min to 0.3 mL/min;
alternatively, the upper concentration limit of the aqueous solution may be independently selected from 0.4 wt%, 0.5 wt%; the lower limit may be independently selected from 0.3 wt%, 0.4 wt%.
Optionally, the aqueous solution contains water for solution preparation;
optionally, the mineralization degree of the water for preparing the liquid is 8000-50000 mg/L, wherein Ca2+/Mg2+The content is 50-1000 mg/L;
optionally, the upper limit of the mineralization degree of the water for preparing the liquid preparation can be independently selected from 10000mg/L, 20000mg/L, 28000mg/L, 30000mg/L, 40000mg/L and 50000 mg/L; the lower limit may be independently selected from 8000mg/L, 10000mg/L, 20000mg/L, 28000mg/L, 30000mg/L, 40000 mg/L.
Optionally, the Ca2+/Mg2+The upper limit of the content can be independently selected from 100mg/L, 300mg/L, 500mg/L, 700mg/L, 800mg/L and 1000 mg/L; the lower limit may be independently selected from 50mg/L, 100mg/L, 300mg/L, 500mg/L, 700mg/L, 800 mg/L.
The specific implementation method of the application is that the method for preparing the water flooding thickened oil viscosity self-emulsifying profile control system into the aqueous solution comprises the following steps:
(a) 298g of mineral degree of 28678.1mg/L (wherein Ca2+/Mg2+776.8mg/L) of simulated formation water is put into a glass beaker, and stirring is started by a mechanical stirrer at the rotating speed of 400-500 r/min; weighing 2g of polymer, slowly adding the polymer into a beaker, adjusting the rotating speed to 500-800 r/min after the adding is finished, continuously stirring for 1-2 h to prepare 300g of polymer mother liquor with the concentration of 6000mg/L, and sealing and curing for 2-12 h;
(b) taking 50g of polymer mother liquor, 0.1-0.375 g of active agent and 0.3-0.52 g of emulsifier, preparing 200g of using solution by using simulated formation water, and stirring for 30-60 min by using a stirrer at the stirring speed of 500-800 r/min to obtain the using solution of the water-drive thickened oil viscosity self-emulsifying profile control and flooding system.
The beneficial effects that this application can produce include:
(1) the system is alkali-free, and the self-emulsifying effect is not realized by adding alkali and increasing the dosage of the surfactant, so that the cost is low, and adverse effects such as scaling and the like can not occur;
(2) the viscosity of the flooding agent is improved by the polymer in the system for profile control, rather than the emulsion formed by self-emulsification, so that the profile control effect is better.
(3) The self-emulsifying viscosity reduction technology of the thickened oil is combined with the existing polymer profile control technology, and multiple mechanisms act synergistically, so that the effect of the flooding agent can be exerted to a greater extent, and the recovery ratio of common thickened oil is improved.
Drawings
Fig. 1 is a displacement result obtained by performing a double-tube core displacement experiment on the a1 solution obtained in example 1 of the present invention.
Detailed Description
The present application will be described in detail with reference to examples, but the present application is not limited to these examples.
Unless otherwise specified, the raw materials in the examples of the present application were all purchased commercially, wherein the emulsified nanomaterial: NIO-03, obtained by itself according to the procedure of example 1 of the patent application No. 202110616616.1; lauryl glucoside was purchased from Jiangsu Haian; laurylamine polyoxyethylene ether is purchased from Jiangsu Haian; polyacrylamide was purchased from shandonoer; the poly-epilayers were purchased from Tianjin Dagang.
Example 1
(1) The degree of mineralization of 297.6g is 28678.1mg/L (wherein Ca2+/Mg2+776.8mg/L) into a glass beaker, and stirring is started with a mechanical stirrer at a speed of 400 r/min; 2.4g of polyacrylamide is measured, slowly added into a beaker, and after the polyacrylamide is added, the rotating speed is adjusted to 50 DEGContinuously stirring for 2h at 0r/min to prepare 300g of polymer mother liquor with the concentration of 7200mg/L, and standing and curing for 2h in a sealed manner;
(2) taking 50g of polyacrylamide mother liquor, adding 0.1g of NIO-03 and 0.26g of laurylamine polyoxyethylene ether into the polyacrylamide mother liquor, preparing the polyacrylamide mother liquor into 200g of solution by using simulated formation water, and stirring the solution for 40min by using a magnetic stirrer to prepare a water-flooding thickened oil viscosity self-emulsifying profile control system which is marked as A1.
Example 2
(1) 298g of mineral degree of 28678.1mg/L (wherein Ca2+/Mg2+776.8mg/L) into a glass beaker, and stirring is started with a mechanical stirrer at a speed of 400 r/min; weighing 2g of polymer surface agent, slowly adding the polymer surface agent into a beaker, regulating the rotating speed to 600r/min after the adding is finished, continuously stirring for 1.5h to prepare 300g of polymer mother liquor with the concentration of 6000mg/L, sealing, standing and curing for 12 h;
(2) 50g of the polymer surfactant mother liquor is taken, 0.375g of NIO-03 and 0.5g of lauryl glucoside are added into the polymer surfactant mother liquor, the polymer surfactant mother liquor is prepared into 200g of solution by using simulated formation water, and the solution is stirred for 30min by using a magnetic stirrer to prepare a water-flooding thickened oil viscosity self-emulsifying profile control system which is marked as A2.
Test example 1 Performance of viscous self-emulsifying profile control system for Water flooding thickened oil
And (3) testing conditions are as follows: the mineralization degree of the experimental water is 28678.1mg/L (wherein, Ca)2+/Mg2+776.8mg/L), and the test crude oil was Lindong region heavy oil (viscosity measured at 50 ℃ C. was 136.2 mPas).
(1) Thermal stability and apparent viscosity of the profile control system use liquid:
the solutions A1 to A2 obtained in examples 1 to 2 were incubated at 30 ℃, 40 ℃, 50 ℃, 60 ℃, 70 ℃ and 80 ℃ to observe the stability, and the viscosity of the solutions was measured at these temperatures with a Brookfield viscometer (rotor No. 0, rotation speed 6 r/min).
TABLE 1
According to the test results, the following test results are obtained: the use liquid of the water-flooding thickened oil viscosity self-emulsifying profile control system can still keep stable at 70 ℃ and has certain viscosity.
(2) Self-emulsifying effect of profile control system using liquid on thickened oil
(2.1) A25 mL glass measuring cylinder was charged with 4mL of Lindong block thick oil and 16mL of the A1 solution obtained in example 1, and after keeping the temperature in an incubator at 50 ℃ for 1 hour, the oil was slowly inverted up and down 5 times (for 1s each time) to observe the emulsified state of the oil, and after keeping the temperature for 0.5 hour, the amount of emulsified/dispersed oil was read.
(2.2) A25 mL glass measuring cylinder was charged with 4mL of Lindong block thick oil and 16mL of the A2 solution obtained in example 2, and after keeping the temperature in an incubator at 50 ℃ for 1 hour, the oil was slowly inverted up and down 5 times (for 1s each time) to observe the emulsified state of the oil, and after keeping the temperature for 0.5 hour, the amount of emulsified/dispersed oil was read.
The results of the measurements are shown in Table 2.
TABLE 2
| Sample (I) | Oil-water state after 5 times of inversion | Amount of emulsifying/dispersing oil (mL) |
| A1 | Relatively uniform system, black and gray, and light-tight | 3.6 |
| A2 | Homogeneous system, dark brown, opaque | 3.9 |
According to the test results, the following test results are obtained: the water-drive thickened oil viscosity self-emulsifying system has a good self-emulsifying effect on the thickened oil in the Dong district, the oil can be mixed into uniform liquid after slight disturbance, the oil amount of the emulsified/dispersed thickened oil is large, the formed O/W emulsion has good stability, and most of the oil is still in an emulsified/dispersed state after heat preservation is carried out for 0.5 h.
(3) Effect of increasing recovery ratio of system
The double-tube core displacement experiment is carried out according to the specification of 9.1-9.4 in SY/T6424-2014. The gas permeability of the two selected cores is about 300mD and 850mD respectively, wherein the displacement speed is 0.3mL/min, and the mineralization degree of water used in the experiment is 28678.1mg/L (wherein the Ca content is2+/Mg2+776.8mg/L), the solution A1 is used in the self-emulsifying profile control system of the viscous water flooding thickened oil used in the agent flooding stage, and the injection amount is 1 PV.
The displacement results are shown in figure 1. As can be seen from fig. 1, the recovery factor after water flooding is 41.77%, the ultimate recovery factor is 62.24%, the enhanced recovery factor of agent flooding and subsequent water flooding stages is 62.24% -41.77% to 20.47%, and the subsequent water flooding stage produces emulsified oil droplets, but the emulsified oil droplets can be self-broken after heat preservation at 50 ℃.
Although the present application has been described with reference to a few embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the application as defined by the appended claims.
Claims (8)
1. The water flooding thickened oil viscosity self-emulsifying profile control system is characterized by comprising the following components in parts by weight:
active agent(s): 4-16 parts of a solvent;
emulsifier: 3-12 parts;
polymer (b): 6-9 parts of a solvent;
the activator is obtained by polymerizing raw materials containing double-bond modified lamellar nano materials, hydrophilic monomers and hydrophobic monomers;
the emulsifier is selected from one or more of lauryl glucoside and laurylamine polyoxyethylene ether;
the polymer is selected from one or more of polyacrylamide and polyepithelizing agent;
the hydrophilic monomer is selected from at least one of anhydride compounds;
the hydrophobic monomer is selected from at least one of long-chain alkyl allyl quaternary ammonium salt;
the double-bond modified lamellar nano material is provided with at least one of modification groups shown as a formula I;
wherein R is1Selected from any one of C1-C4 alkylene, R2Any one selected from C1-C8 alkyl.
2. The preparation method of the water-flooding thickened oil viscosity self-emulsifying profile control system according to claim 1, wherein the water-flooding thickened oil viscosity self-emulsifying profile control system is obtained by preparing a mixed solution of the active agent and the emulsifier, and preparing a solution by matching with the polymer solid particles.
3. The production method according to claim 2,
the weight ratio of the mixed liquid to the polymer is 7-28: 6-9.
4. The application of the water-flooding thickened oil viscosity self-emulsifying profile control system as defined in claim 1 or the water-flooding thickened oil viscosity self-emulsifying profile control system obtained by the preparation method as defined in any one of claims 2-3 in thickened oil recovery.
5. The use according to claim 4,
the service temperature of the water-flooding thickened oil viscosity self-emulsifying profile control system is 35-75 ℃.
6. The use according to claim 4,
the viscosity of the thickened oil under reservoir conditions is 120-2000 mPa & s.
7. The use according to claim 4,
the application comprises the following steps: preparing a water-drive thickened oil viscosity self-emulsifying profile control system into an aqueous solution, and injecting the aqueous solution, wherein the concentration of the aqueous solution is 0.3-0.5 wt%; the injection speed is 0.1 mL/min-0.3 mL/min.
8. The use according to claim 7,
the aqueous solution contains water for solution preparation;
the mineralization degree of the water for the liquid preparation is 8000-50000 mg/L, wherein Ca2+/Mg2+The content is 50-1000 mg/L.
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| CN107365575A (en) * | 2017-06-15 | 2017-11-21 | 中国石油化工股份有限公司 | A kind of viscosity reduction oil displacement agent and oil displacement system suitable for heavy crude reservoir |
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| CN113583650A (en) * | 2021-08-27 | 2021-11-02 | 山东新港化工有限公司 | Viscosity-reducing oil displacement agent for viscosity-reducing composite flooding of common heavy oil reservoir and preparation method and application thereof |
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| CN107365575A (en) * | 2017-06-15 | 2017-11-21 | 中国石油化工股份有限公司 | A kind of viscosity reduction oil displacement agent and oil displacement system suitable for heavy crude reservoir |
| CN111978945A (en) * | 2020-09-01 | 2020-11-24 | 宁波锋成先进能源材料研究院有限公司 | Viscosity reduction auxiliary agent for thickened oil, preparation method and application thereof |
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