CN111621279A - Imbibition oil displacement agent for improving recovery ratio in middle and later periods of oilfield development - Google Patents
Imbibition oil displacement agent for improving recovery ratio in middle and later periods of oilfield development Download PDFInfo
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- CN111621279A CN111621279A CN202010505647.5A CN202010505647A CN111621279A CN 111621279 A CN111621279 A CN 111621279A CN 202010505647 A CN202010505647 A CN 202010505647A CN 111621279 A CN111621279 A CN 111621279A
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- 238000011084 recovery Methods 0.000 title claims abstract description 27
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 25
- 238000005213 imbibition Methods 0.000 title claims description 42
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 40
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 39
- ZMANZCXQSJIPKH-UHFFFAOYSA-N Triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 claims abstract description 36
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 claims abstract description 34
- WYURNTSHIVDZCO-UHFFFAOYSA-N Tetrahydrofuran Chemical compound C1CCOC1 WYURNTSHIVDZCO-UHFFFAOYSA-N 0.000 claims abstract description 34
- YPFDHNVEDLHUCE-UHFFFAOYSA-N 1,3-propanediol Substances OCCCO YPFDHNVEDLHUCE-UHFFFAOYSA-N 0.000 claims abstract description 22
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000012153 distilled water Substances 0.000 claims abstract description 18
- 239000004327 boric acid Substances 0.000 claims abstract description 17
- 239000002994 raw material Substances 0.000 claims abstract description 17
- YLQBMQCUIZJEEH-UHFFFAOYSA-N tetrahydrofuran Natural products C=1C=COC=1 YLQBMQCUIZJEEH-UHFFFAOYSA-N 0.000 claims abstract description 17
- DNIAPMSPPWPWGF-VKHMYHEASA-N (+)-propylene glycol Chemical compound C[C@H](O)CO DNIAPMSPPWPWGF-VKHMYHEASA-N 0.000 claims abstract description 12
- 229940035437 1,3-propanediol Drugs 0.000 claims abstract description 12
- 229920000166 polytrimethylene carbonate Polymers 0.000 claims abstract description 12
- 238000003756 stirring Methods 0.000 claims description 20
- 238000001035 drying Methods 0.000 claims description 12
- 239000000203 mixture Substances 0.000 claims description 11
- 238000004140 cleaning Methods 0.000 claims description 10
- 238000001816 cooling Methods 0.000 claims description 10
- 238000006460 hydrolysis reaction Methods 0.000 claims description 10
- 238000005303 weighing Methods 0.000 claims description 8
- 239000000243 solution Substances 0.000 claims description 6
- 239000011259 mixed solution Substances 0.000 claims description 5
- 238000002360 preparation method Methods 0.000 claims description 5
- JMVWCCOXRGFPJZ-UHFFFAOYSA-N propoxyboronic acid Chemical compound CCCOB(O)O JMVWCCOXRGFPJZ-UHFFFAOYSA-N 0.000 claims description 5
- 230000035484 reaction time Effects 0.000 claims description 5
- 239000002904 solvent Substances 0.000 claims description 5
- GTFPETXSWJYYAY-UHFFFAOYSA-N 1-propoxyhex-1-ene Chemical compound CCCCC=COCCC GTFPETXSWJYYAY-UHFFFAOYSA-N 0.000 claims description 2
- LPHIOCMLVLHSCL-UHFFFAOYSA-N boric acid prop-1-ene Chemical compound C=CC.C=CC.C=CC.B(O)(O)O LPHIOCMLVLHSCL-UHFFFAOYSA-N 0.000 claims description 2
- 239000000463 material Substances 0.000 claims 4
- 239000003921 oil Substances 0.000 abstract description 42
- 239000010779 crude oil Substances 0.000 abstract description 15
- 239000011435 rock Substances 0.000 description 15
- 230000035699 permeability Effects 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- KRNGNWGELWHIOU-UHFFFAOYSA-N 1-hex-1-enoxyhex-1-ene Chemical compound CCCCC=COC=CCCCC KRNGNWGELWHIOU-UHFFFAOYSA-N 0.000 description 3
- QOSMNYMQXIVWKY-UHFFFAOYSA-N Propyl levulinate Chemical compound CCCOC(=O)CCC(C)=O QOSMNYMQXIVWKY-UHFFFAOYSA-N 0.000 description 3
- 239000008398 formation water Substances 0.000 description 3
- -1 tripropylene glycol borate Chemical compound 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- 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
- C09K8/58—Compositions for enhanced recovery methods for obtaining hydrocarbons, i.e. for improving the mobility of the oil, e.g. displacing fluids
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- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Lubricants (AREA)
Abstract
The invention relates to the technical field of oil field treatment, in particular to a seepage oil displacement agent for improving the recovery ratio in the middle and later periods of oil field development, which comprises the following raw materials in parts by weight: 85-95g of tetrahydrofuran, 120g of 1, 3-propanediol 110-one, 30-35g of boric acid, 8-9g of triethylamine, 40-45g of 1-hexene, 32-36g of diethyl ether and 50-55g of distilled water. The seepage and suction oil displacement agent is injected into an oil layer along with injected water, has extremely strong seepage and suction displacement functions on crude oil in low-permeability and ultra-low-permeability areas in a reservoir, can effectively develop the crude oil in the low-permeability and ultra-low-permeability areas, and finally achieves the purpose of further improving the crude oil recovery ratio in the middle and later periods of conventional oil field development.
Description
Technical Field
The invention relates to the technical field of oil field treatment, in particular to a seepage oil displacement agent for improving the recovery ratio in the middle and later stages of oil field development.
Background
The reservoir heterogeneity of the conventional oil field is strong, and the permeability of the reservoir is greatly changed in an oil field block, so that the reservoir has a high permeability area, a medium permeability area, a hypotonic area and even an ultra-hypotonic area. Water injection development has been carried out for decades, and many oil field produced fluids reach a critical development state with water content of more than 95% and recovery efficiency of only about 35%. The strong injection and strong mining enable crude oil in high-permeability and medium-permeability areas in the storage layer to be almost completely displaced by water, and more than 60% of crude oil is not lost and comes out. Because of the limitations of water injection and oil extraction processes, the water injection of crude oil in hypotonic and ultra-hypotonic regions in conventional oil field reservoirs cannot be extracted, and the crude oil which is not extracted in the regions is more than 60% of residual oil, so that the recovery rate is too low.
Disclosure of Invention
The invention aims to provide an imbibition oil displacement agent for improving the recovery efficiency in the middle and later stages of oil field development, so as to solve the problem that the recovery efficiency is too low because the water injection of crude oil in ultra-low permeability areas cannot be extracted due to low permeability in oil field reservoirs and the crude oil which is not extracted in the areas is more than 60% of residual oil.
In order to achieve the purpose, the invention provides the following technical scheme:
an imbibition oil displacement agent for improving the recovery ratio in the middle and later periods of oilfield development comprises the following raw materials by weight: 85-95g of tetrahydrofuran, 120g of 1, 3-propanediol 110-one, 30-35g of boric acid, 8-9g of triethylamine, 40-45g of 1-hexene, 32-36g of diethyl ether and 50-55g of distilled water.
Preferably, the feed comprises the following raw materials by weight: 89g of tetrahydrofuran, 115g of 1, 3-propanediol, 31g of boric acid, 8.7g of triethylamine, 43g of 1-hexene, 35.5g of diethyl ether and 50g of distilled water.
Preferably, the feed comprises the following raw materials by weight: 85g of tetrahydrofuran, 110g of 1, 3-propanediol, 30g of boric acid, 8g of triethylamine, 40g of 1-hexene, 32g of diethyl ether and 52g of distilled water.
Preferably, the feed comprises the following raw materials by weight: 95g of tetrahydrofuran, 120g of 1, 3-propanediol, 35g of boric acid, 9g of triethylamine, 45g of 1-hexene, 36g of diethyl ether and 55g of distilled water.
The preparation method of the imbibition oil displacement agent for improving the recovery ratio in the middle and later periods of oil field development comprises the following steps:
s1: weighing the raw materials according to the weight;
s2: cleaning and drying one four-mouth bottle, adding the weighed tetrahydrofuran into the four-mouth bottle, stirring the solution in the four-mouth bottle by using a magnetic stirrer, and simultaneously adding 1, 3-propylene glycol;
s3: continuously stirring and adding the mixture into boric acid, and reacting for 2-3h at the constant temperature of 80-83 ℃;
s4: continuously stirring and dropwise adding 1-hexene, and reacting for 1-2h at the constant temperature of 70-75 ℃;
s5: cooling to room temperature, transferring into a separating funnel, standing for layering, and separating out a solvent, namely the tripropylene borate;
s6: cleaning and drying one conical flask, adding 50g of trimeric propanol borate in S5 into the conical flask, adding diethyl ether, stirring the mixed solution in the conical flask by using a magnetic stirrer, standing for 10-15min, adding distilled water for hydrolysis reaction, distilling under reduced pressure to remove water, and cooling to obtain propyl monohexenyl ether, namely the imbibition oil-displacing agent.
Preferably, the four-necked bottle is heated in a water bath at 60-70 ℃ in step S2.
Preferably, the constant temperature of the hydrolysis reaction is 70-80 ℃ and the reaction time is 4-5 h.
Compared with the prior art, the invention has the beneficial effects that: the seepage and absorption oil displacement agent for improving the recovery ratio in the middle and later periods of oilfield development is injected into an oil layer along with injected water, has extremely strong seepage and absorption displacement effects on crude oil in low-permeability and ultra-low-permeability areas in a reservoir, can effectively develop the crude oil in the low-permeability and ultra-low-permeability areas, and finally achieves the purpose of further improving the recovery ratio of the crude oil in the middle and later periods of conventional oilfield development.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious 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
An imbibition oil displacement agent for improving the recovery ratio in the middle and later periods of oilfield development comprises the following raw materials by weight: 89g of tetrahydrofuran, 115g of 1, 3-propanediol, 31g of boric acid, 8.7g of triethylamine, 43g of 1-hexene, 35.5g of diethyl ether and 50g of distilled water.
The preparation method of the imbibition oil-displacing agent for improving the recovery ratio in the middle and later periods of oilfield development comprises the following steps:
s1: weighing the raw materials according to the weight;
s2: cleaning and drying one four-mouth bottle, adding the weighed tetrahydrofuran into the four-mouth bottle, stirring the solution in the four-mouth bottle by using a magnetic stirrer, and simultaneously adding 1, 3-propylene glycol;
s3: continuously stirring and adding the mixture into boric acid, and reacting for 2-3h at the constant temperature of 80-83 ℃;
s4: continuously stirring and dropwise adding 1-hexene, and reacting for 1-2h at the constant temperature of 70-75 ℃;
s5: cooling to room temperature, then transferring the mixture into a separating funnel, standing and layering the mixture, and separating out a solvent, namely the tripropylene glycol borate, wherein the specific chemical reaction formula is as follows:
3HO-CH2CH2CH2-OH+H3BO3→B-(OCH2CH2CH2OH)3
B-(OCH2CH2CH2OH)3+C6H12→B-(OCH2CH2CH2OH)3-O-C6H11
s6: cleaning and drying one conical flask, adding 50g of trimeric propanol borate in S5 into the conical flask, adding diethyl ether, stirring the mixed solution in the conical flask by using a magnetic stirrer, standing for 10-15min, adding distilled water for hydrolysis reaction, distilling under reduced pressure to remove water, and cooling to obtain propyl ester monohexenyl ether, namely the imbibition oil-displacing agent, wherein the specific chemical reaction formula is as follows:
in this example, the four-necked flask in step S2 was heated in a water bath at 65 ℃ and the hydrolysis reaction was carried out at a constant temperature of 75 ℃ for a reaction time of 5 hours.
Example 2
An imbibition oil displacement agent for improving the recovery ratio in the middle and later periods of oilfield development comprises the following raw materials by weight: 85g of tetrahydrofuran, 110g of 1, 3-propanediol, 30g of boric acid, 8g of triethylamine, 40g of 1-hexene, 32g of diethyl ether and 52g of distilled water.
The preparation method of the imbibition oil-displacing agent for improving the recovery ratio in the middle and later periods of oilfield development comprises the following steps:
s1: weighing the raw materials according to the weight;
s2: cleaning and drying one four-mouth bottle, adding the weighed tetrahydrofuran into the four-mouth bottle, stirring the solution in the four-mouth bottle by using a magnetic stirrer, and simultaneously adding 1, 3-propylene glycol;
s3: continuously stirring and adding the mixture into boric acid, and reacting for 2-3h at the constant temperature of 80-83 ℃;
s4: continuously stirring and dropwise adding 1-hexene, and reacting for 1-2h at the constant temperature of 70-75 ℃;
s5: cooling to room temperature, then transferring the mixture into a separating funnel, standing and layering the mixture, and separating out a solvent, namely the tripropylene glycol borate, wherein the specific chemical reaction formula is as follows:
3HO-CH2CH2CH2-OH+H3BO3→B-(OCH2CH2CH2OH)3
B-(OCH2CH2CH2OH)3+C6H12→B-(OCH2CH2CH2OH)3-O-O6H11
s6: cleaning and drying one conical flask, adding 50g of trimeric propanol borate in S5 into the conical flask, adding diethyl ether, stirring the mixed solution in the conical flask by using a magnetic stirrer, standing for 10-15min, adding distilled water for hydrolysis reaction, distilling under reduced pressure to remove water, and cooling to obtain propyl ester monohexenyl ether, namely the imbibition oil-displacing agent, wherein the specific chemical reaction formula is as follows:
in this example, the four-necked flask in step S2 was heated in a water bath at 65 ℃ and the hydrolysis reaction was carried out at a constant temperature of 75 ℃ for a reaction time of 5 hours.
Example 3
An imbibition oil displacement agent for improving the recovery ratio in the middle and later periods of oilfield development comprises the following raw materials by weight: 95g of tetrahydrofuran, 120g of 1, 3-propanediol, 35g of boric acid, 9g of triethylamine, 45g of 1-hexene, 36g of diethyl ether and 55g of distilled water.
The preparation method of the imbibition oil-displacing agent for improving the recovery ratio in the middle and later periods of oilfield development comprises the following steps:
s1: weighing the raw materials according to the weight;
s2: cleaning and drying one four-mouth bottle, adding the weighed tetrahydrofuran into the four-mouth bottle, stirring the solution in the four-mouth bottle by using a magnetic stirrer, and simultaneously adding 1, 3-propylene glycol;
s3: continuously stirring and adding the mixture into boric acid, and reacting for 2-3h at the constant temperature of 80-83 ℃;
s4: continuously stirring and dropwise adding 1-hexene, and reacting for 1-2h at the constant temperature of 70-75 ℃;
s5: cooling to room temperature, then transferring the mixture into a separating funnel, standing and layering the mixture, and separating out a solvent, namely the tripropylene glycol borate, wherein the specific chemical reaction formula is as follows:
3HO-CH2CH2CH2-OH+H3BO3→B-(OCH2CH2CH2OH)3
B-(OCH2CH2CH2OH)3+C6H12→B-(OCH2CH2CH2OH)3-O-C6H11
s6: cleaning and drying one conical flask, adding 50g of trimeric propanol borate in S5 into the conical flask, adding diethyl ether, stirring the mixed solution in the conical flask by using a magnetic stirrer, standing for 10-15min, adding distilled water for hydrolysis reaction, distilling under reduced pressure to remove water, and cooling to obtain propyl ester monohexenyl ether, namely the imbibition oil-displacing agent, wherein the specific chemical reaction formula is as follows:
in this example, the four-necked flask in step S2 was heated in a water bath at 65 ℃ and the hydrolysis reaction was carried out at a constant temperature of 75 ℃ for a reaction time of 5 hours.
Example 4
The embodiment is a test for measuring the contact angle of the imbibition oil displacement agent on the surface of rock, and the specific steps are as follows:
85-95g of core with wettability of hydrophilic, neutral and oleophylic respectively is screened out, and firstly, the contact angle theta of distilled 85-95g of water and the surface of the core is measured1Then putting the rock core into 85-95g imbibition agent aqueous solution with the concentration of 0.5 percent of the invention, soaking for 48 hours, drying, and measuring the contact angle theta between distilled water and the rock core (after the imbibition agent is soaked by 85-95 g)2The contact angle changes are shown in table 1:
| core numbering | Porosity/%) | Permeability/× 10-2μm2 | θ1/° | θ2/° |
| Y-1 | 10.9 | 0.97 | 60.3 | 7.1 |
| Y-2 | 11.3 | 1.02 | 89.4 | 7.9 |
| Y-3 | 11.5 | 1.10 | 91.1 | 8.7 |
| Y-4 | 10.9 | 0.99 | 120.1 | 10.6 |
The results in the table show that the imbibition oil displacement agent can change the rock wettability to strong hydrophilicity, and is beneficial to improving the crude oil imbibition efficiency of low-permeability and ultra-low-permeability cores.
And then the crude oil imbibition experiment detection of the imbibition oil displacement agent for improving the recovery ratio in the middle and later periods of oil field development comprises the following specific steps:
drying rock cores M-1, M-2, M-3, M-4, M-5 and M-6, weighing the rock cores after vacuumizing saturated formation water, weighing the rock cores for the second time, saturating simulated oil at the oil reservoir temperature (60C), suspending the treated rock cores on one side of a balance, completely soaking the rock cores into imbibition liquid, absorbing water and discharging oil of the rock cores in the imbibition process, continuously increasing the mass of the rock cores due to the density difference of the oil and the water, weighing the rock cores after 48 hours, and obtaining the mass of the rock cores according to the formula R which is △ M/(rho w-rho 0) v0△ m-t, the mass change value/g of the rock core, rho w is the water density of the simulated formation, g/cm3(ii) a p0 is the simulated oil density, g/cm3(ii) a Vo is volume/cm of rock sample saturated oil3. The results of the experiments are shown in the following table:
| core numbering | Porosity/%) | Permeability/10-2μm2 | Conditions of imbibition | Imbibition rate/% |
| M-1 | 10.3 | 0.88 | Pure formation water | 9.7 |
| M-2 | 11.0 | 0.91 | 0.3% imbibition oil-displacing agent | 19.3 |
| M-3 | 12.1 | 1.02 | 0.4% imbibition oil displacement agent | 27.7 |
| M-4 | 11.4 | 0.96 | 0.5% imbibition oil displacement agent | 31.3 |
| M-5 | 11.7 | 0.98 | 0.6% imbibition oil-displacing agent | 31.4 |
| M-6 | 12.0 | 1.10 | 0.7% imbibition oil-displacing agent | 30.9 |
Experimental surface: the imbibition efficiency of the 0.5% imbibition oil-displacing agent to crude oil is up to 31.3%, the imbibition efficiency is higher than formation water by 21.6%, and the porosity of the 0.5% imbibition oil-displacing agent is 11.4%.
The invention discloses a permeation oil-displacing agent aiming at the characteristic of heterogeneity of a high-water-content oil storage layer in the middle and later periods of conventional oil field development.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and the preferred embodiments of the present invention are described in the above embodiments and the description, and are not intended to limit the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (7)
1. The seepage oil-displacing agent for improving the recovery ratio in the middle and later periods of oil field development is characterized in that: the material comprises the following raw materials by weight: 85-95g of tetrahydrofuran, 120g of 1, 3-propanediol 110-one, 30-35g of boric acid, 8-9g of triethylamine, 40-45g of 1-hexene, 32-36g of diethyl ether and 50-55g of distilled water.
2. The imbibition oil displacement agent for enhanced oil recovery in the middle and later stages of oilfield development of claim 1, wherein: the material comprises the following raw materials by weight: 89g of tetrahydrofuran, 115g of 1, 3-propanediol, 31g of boric acid, 8.7g of triethylamine, 43g of 1-hexene, 35.5g of diethyl ether and 50g of distilled water.
3. The imbibition oil displacement agent for enhanced oil recovery in the middle and later stages of oilfield development of claim 1, wherein: the material comprises the following raw materials by weight: 85g of tetrahydrofuran, 110g of 1, 3-propanediol, 30g of boric acid, 8g of triethylamine, 40g of 1-hexene, 32g of diethyl ether and 52g of distilled water.
4. The imbibition oil displacement agent for enhanced oil recovery in the middle and later stages of oilfield development of claim 1, wherein: the material comprises the following raw materials by weight: 95g of tetrahydrofuran, 120g of 1, 3-propanediol, 35g of boric acid, 9g of triethylamine, 45g of 1-hexene, 36g of diethyl ether and 55g of distilled water.
5. The imbibition oil displacement agent for enhanced oil recovery in the middle and later stages of oilfield development according to any one of claims 1-4, wherein: the preparation method comprises the following steps:
s1: weighing the raw materials according to the weight;
s2: cleaning and drying one four-mouth bottle, adding the weighed tetrahydrofuran into the four-mouth bottle, stirring the solution in the four-mouth bottle by using a magnetic stirrer, and simultaneously adding 1, 3-propylene glycol;
s3: continuously stirring and adding the mixture into boric acid, and reacting for 2-3h at the constant temperature of 80-83 ℃;
s4: continuously stirring and dropwise adding 1-hexene, and reacting for 1-2h at the constant temperature of 70-75 ℃;
s5: cooling to room temperature, transferring into a separating funnel, standing for layering, and separating out a solvent, namely the tripropylene borate;
s6: cleaning and drying one conical flask, adding 50g of trimeric propanol borate in S5 into the conical flask, adding diethyl ether, stirring the mixed solution in the conical flask by using a magnetic stirrer, standing for 10-15min, adding distilled water for hydrolysis reaction, distilling under reduced pressure to remove water, and cooling to obtain propyl monohexenyl ether, namely the imbibition oil-displacing agent.
6. The imbibition oil displacement agent for enhanced oil recovery in the mid-to late-term oilfield development of claim 5, wherein: in step S2, the four-necked bottle is heated in a water bath at 60-70 deg.C.
7. The imbibition oil displacement agent for enhanced oil recovery in the mid-to late-term oilfield development of claim 5, wherein: the constant temperature of the hydrolysis reaction is 70-80 ℃, and the reaction time is 4-5 h.
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Application publication date: 20200904 |