CN112175597A - Well-flushing foam water shutoff agent and preparation method thereof - Google Patents
Well-flushing foam water shutoff agent and preparation method thereof Download PDFInfo
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- CN112175597A CN112175597A CN202010977976.XA CN202010977976A CN112175597A CN 112175597 A CN112175597 A CN 112175597A CN 202010977976 A CN202010977976 A CN 202010977976A CN 112175597 A CN112175597 A CN 112175597A
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- 239000006260 foam Substances 0.000 title claims abstract description 108
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 75
- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 48
- 238000011010 flushing procedure Methods 0.000 title claims abstract description 45
- 238000002360 preparation method Methods 0.000 title abstract description 7
- 239000002562 thickening agent Substances 0.000 claims abstract description 31
- 239000003381 stabilizer Substances 0.000 claims abstract description 16
- 239000004088 foaming agent Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims abstract description 3
- 229940051841 polyoxyethylene ether Drugs 0.000 claims description 24
- 229920000056 polyoxyethylene ether Polymers 0.000 claims description 24
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 claims description 22
- MRUAUOIMASANKQ-UHFFFAOYSA-N cocamidopropyl betaine Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC([O-])=O MRUAUOIMASANKQ-UHFFFAOYSA-N 0.000 claims description 18
- 229940073507 cocamidopropyl betaine Drugs 0.000 claims description 18
- AOMUHOFOVNGZAN-UHFFFAOYSA-N N,N-bis(2-hydroxyethyl)dodecanamide Chemical group CCCCCCCCCCCC(=O)N(CCO)CCO AOMUHOFOVNGZAN-UHFFFAOYSA-N 0.000 claims description 7
- 229940031957 lauric acid diethanolamide Drugs 0.000 claims description 7
- 239000002280 amphoteric surfactant Substances 0.000 claims description 6
- 239000004094 surface-active agent Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 239000002202 Polyethylene glycol Substances 0.000 claims description 3
- 125000006353 oxyethylene group Chemical group 0.000 claims description 3
- 229920001223 polyethylene glycol Polymers 0.000 claims description 3
- 229940113125 polyethylene glycol 3000 Drugs 0.000 claims description 3
- IXOCGRPBILEGOX-UHFFFAOYSA-N 3-[3-(dodecanoylamino)propyl-dimethylazaniumyl]-2-hydroxypropane-1-sulfonate Chemical compound CCCCCCCCCCCC(=O)NCCC[N+](C)(C)CC(O)CS([O-])(=O)=O IXOCGRPBILEGOX-UHFFFAOYSA-N 0.000 claims description 2
- CNIGBCBFYDWQHS-QXMHVHEDSA-N 3-[dimethyl-[3-[[(z)-octadec-9-enoyl]amino]propyl]azaniumyl]-2-hydroxypropane-1-sulfonate Chemical compound CCCCCCCC\C=C/CCCCCCCC(=O)NCCC[N+](C)(C)CC(O)CS([O-])(=O)=O CNIGBCBFYDWQHS-QXMHVHEDSA-N 0.000 claims description 2
- 125000000217 alkyl group Chemical group 0.000 claims 1
- 239000000203 mixture Substances 0.000 claims 1
- 238000005187 foaming Methods 0.000 abstract description 8
- 230000000087 stabilizing effect Effects 0.000 abstract description 7
- 230000000694 effects Effects 0.000 abstract description 6
- 238000005406 washing Methods 0.000 description 16
- 239000003921 oil Substances 0.000 description 14
- ZZNDQCACFUJAKJ-UHFFFAOYSA-N 1-phenyltridecan-1-one Chemical compound CCCCCCCCCCCCC(=O)C1=CC=CC=C1 ZZNDQCACFUJAKJ-UHFFFAOYSA-N 0.000 description 13
- 239000000047 product Substances 0.000 description 12
- 239000010779 crude oil Substances 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 10
- ONJQDTZCDSESIW-UHFFFAOYSA-N polidocanol Chemical compound CCCCCCCCCCCCOCCOCCOCCOCCOCCOCCOCCOCCOCCO ONJQDTZCDSESIW-UHFFFAOYSA-N 0.000 description 9
- 239000007788 liquid Substances 0.000 description 7
- 239000003129 oil well Substances 0.000 description 5
- 238000011084 recovery Methods 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 230000002195 synergetic effect Effects 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 238000011056 performance test Methods 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 239000003599 detergent Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002736 nonionic surfactant Substances 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 239000003079 shale oil Substances 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 241000196324 Embryophyta Species 0.000 description 1
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- -1 alcohol amine Chemical class 0.000 description 1
- 150000008051 alkyl sulfates Chemical class 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- 150000001412 amines Chemical class 0.000 description 1
- 239000012752 auxiliary agent Substances 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 238000009933 burial Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000013065 commercial product Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000012188 paraffin wax Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002888 zwitterionic surfactant Substances 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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
-
- 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
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5086—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Detergent Compositions (AREA)
Abstract
The invention relates to a well-flushing foam water shutoff agent and a preparation method thereof, and solves the problems of poor water shutoff effect and oil layer pollution caused by high addition concentration of products and poor foam stability at high temperature in field practical application. The foam water shutoff agent comprises the following components in percentage by weight: 0.2-0.8% of foaming agent, 0.2-0.6% of foam stabilizer, 0.2-0.8% of thickening agent and the balance of water; the preparation method comprises the following steps: and adding the foaming agent, the foam stabilizer and the thickening agent into water according to the corresponding proportion, and fully and uniformly mixing to prepare the well-flushing foam water plugging agent. The well-flushing foam water shutoff agent has low cost and low application concentration, has excellent foaming performance and foam stabilizing performance when the well-flushing temperature is 70 ℃, and is environment-friendly.
Description
The technical field is as follows:
the invention relates to the technical field of oilfield chemistry, in particular to a well-flushing foam water shutoff agent and a manufacturing method thereof.
Background art:
along with the continuous deep development of the oil field, in order to ensure the continuous and stable production of the oil field and increase the development force of the low-yield and low-permeability oil field, the technology is continuously innovated and advanced, the yield of compact oil and shale oil is required, the compact oil and shale oil have deep reservoir burial, the physicochemical properties of crude oil are different, the formation pressure of most oil fields is low, the water sensitivity characteristic is realized, the recovery time of the crude oil yield is long after the well is washed by the oil well, a certain influence is caused on the completion of the production allocation of a single well, and in order to shorten the influence of the well washing of the oil well on the recovery time of the crude oil yield, a well washing foam water plugging agent is added into the well washing water, so that the effects of washing oil, foaming, dissolving paraffin and asphaltene are realized, the pressure of. The existing field practical application product is a compound product mainly comprising alkyl sulfate, and has the main problems of high addition concentration, high cost, poor foam stability at high temperature, poor water plugging performance, oil layer pollution, undesirable field oil washing effect and frequent well washing period.
The invention content is as follows:
the invention aims to solve the technical problem of pollution to oil layers caused by poor water plugging effect due to large addition concentration of on-site practical application products and poor foam stability at high temperature in the background technology, and provides the well washing foam water plugging agent which is low in cost and application concentration, has excellent foaming performance and foam stabilizing performance at a well washing temperature of 70 ℃, and is environment-friendly. The invention also provides a preparation method of the well-flushing foam water shutoff agent.
The invention can solve the problems by the following technical scheme: a well-flushing foam water shutoff agent comprises the following components in percentage by weight: 0.2-0.8% of foaming agent, 0.2-0.6% of foam stabilizer, 0.2-0.8% of thickening agent and the balance of water.
The foam stabilizer is lauric acid diethanolamide; the thickening agent is any one of R1010, polyethylene glycol 2000 or polyethylene glycol 3000; the water is used in oil field; the foaming agent consists of sodium dodecyl sulfate and fatty alcohol-polyoxyethylene ether; the weight ratio of the sodium dodecyl sulfate to the fatty alcohol-polyoxyethylene ether is 1: 9-9: 1.
The molecular formula of the fatty alcohol-polyoxyethylene ether RO (CH)2CH2O)nH, wherein R is C12～C14N is 9 or 15, the value of n being mainly the number of oxyethylene groups in the surfactant molecule; the amphoteric surfactant is any one of cocamidopropyl betaine, cocamidopropyl hydroxysultaine or oleamidopropyl hydroxysultaine.
The well-flushing foam water shutoff agent also comprises 0.05-0.2 wt% of amphoteric surfactant.
The invention also provides a preparation method of the well-flushing foam water shutoff agent, which comprises the following steps: and adding the foaming agent, the foam stabilizer and the thickening agent into water according to the corresponding proportion, and fully and uniformly mixing to prepare the well-flushing foam water plugging agent.
The well-flushing foam water shutoff agent of the invention comprises the following components: the foaming agent mainly considers two aspects of foaming performance and cost, the foaming performance of the lauryl sodium sulfate is excellent, and the foaming performance of a negative-non-surfactant compound system formed after the lauryl sodium sulfate is compounded with fatty alcohol-polyoxyethylene ether is more excellent.
The stability of foam mainly depends on the type of surfactant, and due to the difference of molecular structures, the arrangement in a liquid film and the interaction with water are different, the thickness, elasticity and viscosity of the formed liquid film are different, so that the processes of carrying and discharging the liquid in the foam are different, and the stability of the foam is different. Therefore, the viscosity of the solution is changed by screening the synergistic auxiliary agent and the thickening agent, and the stability of the foam can be improved. The long-chain alcohol and long-chain organic amine, amide and alcohol amine substances which are commonly used at present and have excellent foam stabilizing performance in cooperation with sodium dodecyl sulfate can improve the cohesive force of a mixed adsorption layer on the surface of a liquid film, and the mechanical strength of the liquid film is improved, so that the stability of a foam liquid film is improved. Therefore, the lauric acid diethanolamide is selected as the foam stabilizer, and experiments show that the lauric acid diethanolamide has a good foam stabilizing effect under the condition of low dosage.
The thickening agent is mainly used for increasing the viscosity of the preparation liquid, enhancing the thickness of a foam film and enhancing the stability of foam, and the foam is not easy to break under the dual actions of high temperature and gravity; the selected thickener 1010 (new materials, Inc., Guangzhou city) does not affect the foaming performance of the foam on one hand, and can increase the viscosity of the system and increase the thickness of the foam on the other hand, thereby further increasing the stability of the foam.
The synergistic effect of the foam stabilizer and the foaming agent sodium dodecyl sulfate is beneficial to increasing the stability of the foam. The foaming agent and the detergent are prepared by taking an anionic-nonionic surfactant as a main body and an auxiliary zwitterionic surfactant as a foaming agent and a detergent, and a thickening agent and a foam stabilizer are added to play a role of the foam stabilizer in a synergistic manner.
The invention relates to a well-flushing foam water shutoff agent which is compounded by a foaming agent, a foam stabilizer and a tackifier and takes an anionic-nonionic surfactant and an amphoteric surfactant as main components. The crude oil production operation can be quickly recovered, and the single-well yield of the crude oil is improved.
Compared with the background technology, the well-flushing foam water shutoff agent has the following beneficial effects: the well-flushing foam water shutoff agent has excellent foam stability, the half-life period is as high as 1.5h-2h, the time required by well-flushing operation can be fully met, and the purposes of cost reduction and efficiency improvement can be achieved: firstly, the foam stabilizing performance of the product is improved, the water plugging effect is better played, and secondly, the foam stabilizing performance test and the oil well cleaning performance test are carried out on the crude oil on site. The formula of the oil well washing water plugging agent is easy to prepare, the addition amount is low, the well washing water plugging effect is superior to that of a product used firstly, the use is simple and convenient, the well washing cost is saved by nearly 40%, and the oil well washing water plugging agent has a good popularization prospect.
The specific implementation mode is as follows:
the following examples are given to illustrate the present invention in further detail, and it should be noted that the following examples are not to be construed as limiting the scope of the present invention, and that the insubstantial modifications and variations of the present invention as disclosed above may be made by those skilled in the art without departing from the scope of the present invention.
The present invention is further illustrated by the following examples, which are not intended to limit the scope of the invention in any way, and which are not intended to be limiting, and which are selected by the skilled artisan in accordance with conventional procedures and conditions, or in accordance with the specifications for the commercial product.
The foam half-life is determined by bubbling, based on the reduction of the foam volume to half of the original foam volume. The measurement conditions were 1MPa, 70 ℃.
Example 1
0.3g of sodium dodecyl sulfate, 0.033g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.05g of cocamidopropyl betaine, 0.2g of lauric acid diethanolamide, 0.2g of thickener 1010 and 99.217g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water shutoff agent. The half-life period of the prepared foam water shutoff agent is measured to be 0.96 h.
Example 2
0.3g of sodium dodecyl sulfate, 0.13g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.05g of cocamidopropyl betaine, 0.2g of lauric diethanolamide, 0.2g of thickener 1010 and 99.120g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was determined to be 1.01 h.
Example 3
0.3g of sodium dodecyl sulfate, 0.075g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.05g of cocamidopropyl betaine, 0.2g of lauric diethanolamide, 0.2g of thickener 1010 and 99.175g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water shutoff agent. The half-life of the foam was 1.08 h.
Example 4
0.3g of sodium dodecyl sulfate, 0.075g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.05g of cocamidopropyl betaine, 0.2g of lauric diethanolamide, 0.5g of thickener 1010 and 98.875g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water shutoff agent. The half-life of the foam was 1.25 h.
Example 5
0.3g of sodium dodecyl sulfate, 0.075g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.05g of cocamidopropyl betaine, 0.2g of lauric diethanolamide, 0.6g of thickener 1010 and 98.775g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water shutoff agent. The half-life of the foam was 1.50 h.
Example 6
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.05g of cocamidopropyl betaine, 0.3g of lauric diethanolamide, 0.6g of thickener 1010 and 98.550g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.55 h.
Example 7
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.1g of cocamidopropyl betaine, 0.35g of lauric diethanolamide, 0.6g of thickener 1010 and 98.450g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water shutoff agent. The half-life of the foam was 1.55 h.
Example 8
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.1g of cocamidopropyl betaine, 0.4g of lauric diethanolamide, 0.6g of thickener 1010 and 98.400g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.62 h.
Example 9
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-9), 0.1g of cocamidopropyl betaine, 0.5g of lauric diethanolamide, 0.6g of thickener 1010 and 98.300g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.61 h.
Example 10
0.3g of sodium dodecyl sulfate, 0.033g of fatty alcohol-polyoxyethylene ether (AEO-15), 0.05g of cocamidopropyl betaine, 0.2g of lauric acid diethanolamide, 0.6g of thickener 1010 and 98.817g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water shutoff agent. The half-life of the foam was 1.05 h.
Example 11
0.3g of sodium dodecyl sulfate, 0.033g of fatty alcohol-polyoxyethylene ether (AEO-15), 0.05g of cocamidopropyl betaine, 0.3g of lauric acid diethanolamide, 0.6g of thickener 1010 and 98.717g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water shutoff agent. The half-life of the foam was 1.25 h.
Example 12
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-15), 0.05g of cocamidopropyl betaine, 0.3g of lauric diethanolamide, 0.6g of thickener 1010 and 98.550g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.68 h.
Example 13
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-15), 0.1g of cocamidopropyl betaine, 0.3g of lauric diethanolamide, 0.6g of thickener 1010 and 98.500g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.75 h.
Example 14
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-15), 0.1g of cocamidopropyl betaine, 0.4g of lauric diethanolamide, 0.6g of thickener 1010 and 98.400g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.72 h.
Example 15
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-15), 0.1g of cocamidopropyl betaine, 0.4g of lauric diethanolamide, 0.6g of thickening agent (polyethylene glycol 2000) and 98.400g of water are added into an erlenmeyer flask and fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.06 h.
Example 16
0.4g of sodium dodecyl sulfate, 0.1g of fatty alcohol-polyoxyethylene ether (AEO-15), 0.1g of cocamidopropyl betaine, 0.4g of lauric diethanolamide, 0.6g of a thickening agent (polyethylene glycol 3000) and 98.400g of water are added into an erlenmeyer flask and are fully and uniformly mixed to prepare the well-flushing foam water plugging agent. The half-life of the foam was 1.22 h.
The above examples show that as the concentration of the surfactant, the foam stabilizer and the thickener is increased, the foam half-life time is increased, but when the concentration is increased to a certain concentration, the foam half-life is not changed greatly, and too long foam half-life is not helpful to site construction, but the cost of raw materials is increased relatively. Therefore, under the condition of meeting the requirement of site construction time, the operation cost can be controlled by reducing the application concentration as much as possible. As the number of oxyethylene groups in the fatty alcohol-polyoxyethylene ether is increased, the foaming performance is rich, and the foam stabilizing performance is increased under the synergistic action of the surfactants and the action of the foam stabilizer.
The formula 5 is adopted in a laboratory for proportioning, and under the condition that the oil content is 25%, the half-life period of the foam is 1.28h, so that the requirement on the operation time can be completely met.
The raw materials of the components of the invention are all sold in the market, have wide sources, are easy to purchase and have low cost. Thickener R1010 is a compounded product available from ten thousand new materials limited, guangzhou city.
Considering that the product not only has rich foam water plugging performance, but also has certain oil washing performance, the interface performance of the two products is considered and shown in table 1. The two products are respectively prepared by clean water, and are subjected to an interfacial tension test with crude oil of a nine-factory oil extraction plant, and the test temperature is 70 ℃.
TABLE 1
The interface performance test shows that the product has lower interface tension than the existing product, and the on-site well-flushing performance is superior to the existing product.
The well-flushing foam water shutoff agent is implemented on site as follows:
the operation site adopts the raw material proportioning test of the formula 5 for 20 wells, and the comparison before and after the chemical adding and hot washing is shown in the table 2. Compared with a hot well without chemicals, the single well produces 2.43 tons of crude oil per day averagely, the recovery time of the yield after hot washing is 7 days, the average crude oil per day after chemicals are added is 2.5 tons, the recovery time of the yield after hot washing is 3.8 days, the recovery time of the yield of the single well is shortened by 3.2 days, and the yield of the crude oil of the single well is increased by 8 tons. The method has good economic benefit and wide popularization value.
TABLE 2
Claims (9)
1. A well-flushing foam water shutoff agent comprises the following components in percentage by weight: 0.2-0.8% of foaming agent, 0.2-0.6% of foam stabilizer, 0.2-0.8% of thickening agent and the balance of water.
2. The well-flushing foam plugging agent of claim 1, wherein: the components and the mixture ratio are as follows by weight percent: 0.2-0.6% of foaming agent, 0.2-0.5% of foam stabilizer, 0.3-0.6% of thickening agent and the balance of water.
3. The well-flushing foam plugging agent of claim 1 or 2, wherein: the foam stabilizer is lauric acid diethanolamide; the thickener is any one of R1010, polyethylene glycol 2000 or polyethylene glycol 3000.
4. The well-flushing foam plugging agent of claim 1 or 2, wherein: the foaming agent consists of sodium dodecyl sulfate, fatty alcohol-polyoxyethylene ether and an amphoteric surfactant.
5. The well-flushing foam plugging agent of claim 4, wherein: the weight ratio of the sodium dodecyl sulfate to the fatty alcohol-polyoxyethylene ether is 1: 9-9: 1.
6. The well-flushing foam plugging agent of claim 4, wherein: the molecular formula of the fatty alcohol-polyoxyethylene ether is RO (CH2CH2O) nH, wherein R is straight-chain alkyl of C12-C14, n is 9 or 15, and n is mainly the number of oxyethylene groups in surfactant molecules; the amphoteric surfactant is any one of cocamidopropyl betaine, cocamidopropyl hydroxysultaine or oleamidopropyl hydroxysultaine.
7. The well-flushing foam plugging agent of claim 1 or 2, wherein: also comprises 0.05 to 0.2 weight percent of amphoteric surfactant.
8. The well-flushing foam plugging agent of claim 1 or 2, wherein: the water is used in oil field.
9. A method for preparing a well-flushing foam plugging agent according to claim 1 or 2, wherein the method comprises the following steps: and adding the foaming agent, the foam stabilizer and the thickening agent into water according to the corresponding proportion, and fully and uniformly mixing to prepare the well-flushing foam water plugging agent.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010977976.XA CN112175597A (en) | 2020-09-17 | 2020-09-17 | Well-flushing foam water shutoff agent and preparation method thereof |
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| CN202010977976.XA CN112175597A (en) | 2020-09-17 | 2020-09-17 | Well-flushing foam water shutoff agent and preparation method thereof |
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| CN (1) | CN112175597A (en) |
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| CN115612479A (en) * | 2022-10-24 | 2023-01-17 | 四川川庆井下科技有限公司 | Multifunctional foam fluid for low-permeability low-pressure gas reservoir and preparation method thereof |
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