CN114656946A - Emulsion breaking and gel breaking agent for emulsion fracturing fluid without residues - Google Patents
Emulsion breaking and gel breaking agent for emulsion fracturing fluid without residues Download PDFInfo
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- CN114656946A CN114656946A CN202210229656.5A CN202210229656A CN114656946A CN 114656946 A CN114656946 A CN 114656946A CN 202210229656 A CN202210229656 A CN 202210229656A CN 114656946 A CN114656946 A CN 114656946A
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- emulsion
- fracturing fluid
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- benzene sulfonate
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
Abstract
The invention discloses a residue-free demulsification gel breaker for emulsion fracturing fluid. The raw materials of the demulsification gel breaker comprise 8-10% of a nonionic demulsifier, 10-15% of persulfate, 1-3% of C10-16 sodium alkyl benzene sulfonate, 1-3% of fatty alcohol-polyoxyethylene ether sodium sulfate, 3-5% of cocamidopropyl ammonium oxide, 5-10% of sodium chloride and the balance of water. Firstly, adding water into a reaction kettle with a stirrer, and slowly adding sodium chloride and persulfate in sequence under stirring; after complete dissolution, sequentially adding sodium alkyl benzene sulfonate, fatty alcohol-polyoxyethylene ether sodium sulfate, cocamidopropyl ammonium oxide and a nonionic demulsifier, and uniformly stirring to obtain the product emulsion fracturing fluid residue-free demulsification gel breaker. When the product of the invention is used for breaking the gel, the broken gel emulsion fracturing fluid is clear and is not emulsion-shaped any more, and meanwhile, no floating matter exists on the surface of the broken gel liquid. Therefore, the cost of later-stage water treatment is greatly reduced, and the construction safety of the emulsion fracturing fluid is improved.
Description
The technical field is as follows:
the invention belongs to the technical field of oil fracturing exploitation, and particularly relates to a residue-free demulsification gel breaker for emulsion fracturing fluid.
Secondly, background art:
with the continuous development of oil and gas field exploitation, the secondary development of old wells, more and more low-permeability new wells are exploited, and the fracturing exploitation technology is also continuously innovated. Water-based fracturing is a common technique for achieving reservoir reformation in hydrocarbon reservoirs. In recent years, the national attention on environmental protection and the efficient and economic development of the fracturing construction technology are focused, and the synthetic emulsion fracturing fluid gradually replaces the guanidine gum fracturing fluid and is increasingly applied to oil fields.
Compared with the traditional guanidine gum fracturing fluid, the emulsion fracturing fluid has the obvious advantages that: low formation damage, fast swelling, convenient continuous mixing and construction, drainage assistance and production increase. However, the emulsion fracturing fluid generally has a problem that gel breaking is not thorough, although the apparent viscosity after gel breaking can reach below 5mPa · s, most of emulsion breaking fluids are in an unclearly emulsion state, even floaters exist on the liquid surface, pressure is caused to purification treatment of later-stage liquid, and potential safety hazards are brought to construction. Therefore, it is necessary to develop a demulsifying breaker capable of completely demulsifying the emulsion fracturing fluid and eliminating surface floaters.
Thirdly, the invention content:
the technical problem to be solved by the invention is as follows: according to the continuous improvement of the requirements of the prior art on the performance of the emulsion fracturing fluid, the invention provides a residue-free demulsification gel breaker of the emulsion fracturing fluid. The demulsifying and gel breaking agent can realize complete demulsification after emulsion breaking and eliminate floaters on the surface of the gel breaking liquid. Thereby improving the use level of the emulsion fracturing fluid.
In order to solve the problems, the invention adopts the technical scheme that:
the invention provides a residue-free demulsification gel breaker for emulsion fracturing fluid, which comprises the following raw materials in percentage by mass: 8-10% of a nonionic demulsifier, 10-15% of persulfate, 1-3% of C10-16 sodium alkyl benzene sulfonate, 1-3% of fatty alcohol polyoxyethylene ether sodium sulfate, 3-5% of cocamidopropyl ammonium oxide, 5-10% of sodium chloride and the balance of water.
According to the residue-free emulsion breaking gel agent for the emulsion fracturing fluid, the nonionic emulsion breaker is at least one of fatty alcohol-polyoxyethylene ether AEO-3 and fatty alcohol-polyoxyethylene ether AEO-5.
According to the emulsion fracturing fluid residue-free demulsification gel breaker, the persulfate is at least one of potassium persulfate and ammonium persulfate.
According to the emulsion fracturing fluid residue-free demulsification gel breaker, the C10-16 sodium alkyl benzene sulfonate is sodium dodecyl benzene sulfonate, sodium undecyl benzene sulfonate, sodium dodecyl benzene sulfonate, sodium tridecyl benzene sulfonate, sodium tetradecyl benzene sulfonate, sodium pentadecyl benzene sulfonate or sodium hexadecyl benzene sulfonate.
The preparation method of the emulsion fracturing fluid residue-free demulsification gel breaker comprises the following steps:
a. firstly, weighing various raw materials according to the proportion of the emulsion fracturing fluid residue-free demulsification gel breaker;
b. adding the weighed water into a reaction kettle with a stirrer, and then sequentially and slowly adding the weighed sodium chloride and persulfate under the stirring condition; after the emulsion breaking agent is completely dissolved, sequentially adding sodium alkyl benzene sulfonate, fatty alcohol-polyoxyethylene ether sodium sulfate, cocamidopropyl ammonium oxide and a nonionic demulsifier, and uniformly stirring to obtain the product, namely the emulsion breaking agent without residue for the emulsion fracturing fluid.
The invention has the following positive beneficial effects:
1. the demulsifying and gel breaking agent is suitable for gel breaking of the artificially synthesized emulsion fracturing fluid. When the fracturing fluid is used, the fracturing fluid is continuously and uniformly fed in a pump injection mode, the viscosity of the fracturing fluid can be reduced to be less than 5mPa & s within 4h by breaking the gel, and the required addition amount is 0.2-2%.
2. When the product of the invention is used for breaking the gel, the broken gel emulsion fracturing fluid is clear and is not emulsion any more, and meanwhile, no floating object exists on the surface of the broken gel liquid. Therefore, the cost of water treatment in the later period is greatly reduced, and the construction safety of the emulsion fracturing fluid is improved.
3. When the product is used for gel breaking, the surface tension of the emulsion fracturing fluid after gel breaking can reach below 26mN/m, and smooth reverse discharge of gel breaking liquid is facilitated.
In conclusion, the invention has remarkable social and economic benefits.
The fifth embodiment is as follows:
the invention is further illustrated by the following examples, which do not limit the scope of the invention.
Example 1:
the invention relates to a residue-free demulsification gel breaker for emulsion fracturing fluid, which comprises the following raw materials in percentage by mass: fatty alcohol-polyoxyethylene ether AEO-38%, ammonium persulfate 10%, sodium dodecyl benzene sulfonate 1%, fatty alcohol-polyoxyethylene ether sodium sulfate 1%, cocamidopropyl ammonium oxide 3%, sodium chloride 5%, and the balance of water.
Example 2:
the invention relates to a residue-free demulsification gel breaker for emulsion fracturing fluid, which comprises the following raw materials in percentage by mass: fatty alcohol-polyoxyethylene ether AEO-39%, potassium persulfate 10%, sodium dodecyl benzene sulfonate 1%, fatty alcohol-polyoxyethylene ether sodium sulfate 1%, cocamidopropyl ammonium oxide 3%, sodium chloride 5%, and the balance of water.
Example 3:
the invention relates to a residue-free demulsification gel breaker for emulsion fracturing fluid, which comprises the following raw materials in percentage by mass: fatty alcohol-polyoxyethylene ether AEO-58%, ammonium persulfate 15%, sodium dodecyl benzene sulfonate 1%, fatty alcohol-polyoxyethylene ether sodium sulfate 1%, cocamidopropyl ammonium oxide 3%, sodium chloride 5%, and the balance of water.
Example 4:
the invention relates to a residual-free demulsification gel breaker for emulsion fracturing fluid, which comprises the following raw materials in percentage by mass: fatty alcohol-polyoxyethylene ether AEO-310%, persulfate 15% (the persulfate is a mixture obtained by mixing ammonium persulfate and potassium persulfate according to the mass ratio of 1: 1), sodium dodecyl benzene sulfonate 1%, fatty alcohol-polyoxyethylene ether sodium sulfate 3%, cocamidopropyl ammonium oxide 3%, sodium chloride 5%, and the balance of water.
Example 5:
the invention relates to a residue-free demulsification gel breaker for emulsion fracturing fluid, which comprises the following raw materials in percentage by mass: fatty alcohol-polyoxyethylene ether AEO-38%, ammonium persulfate 10%, sodium dodecyl benzene sulfonate 2%, fatty alcohol-polyoxyethylene ether sodium sulfate 1%, cocamidopropyl ammonium oxide 5%, sodium chloride 5%, and the balance of water.
Example 6:
the invention relates to a residue-free demulsification gel breaker for emulsion fracturing fluid, which comprises the following raw materials in percentage by mass: fatty alcohol-polyoxyethylene ether AEO-39%, potassium persulfate 12%, sodium dodecyl benzene sulfonate 3%, sodium fatty alcohol-polyoxyethylene ether sulfate 2%, cocamidopropyl ammonium oxide 5%, sodium chloride 5%, and the balance of water.
The emulsion fracturing fluid described in examples 1-6 is prepared without a residual demulsifying gel breaker:
a. firstly, weighing various raw materials according to the proportion of the emulsion fracturing fluid residue-free demulsification gel breaker in any one of embodiments 1-6;
b. adding the weighed water into a reaction kettle with a stirrer, and then sequentially and slowly adding the weighed sodium chloride and persulfate under the stirring condition; after the mixture is completely dissolved, sequentially adding sodium dodecyl benzene sulfonate, fatty alcohol-polyoxyethylene ether sodium sulfate, cocamidopropyl ammonium oxide and a nonionic demulsifier, and uniformly stirring to obtain the product, namely the emulsion breaking gel agent without residue in the emulsion fracturing fluid.
The emulsion breaking experiment is carried out by using the product emulsion fracturing fluid prepared in the embodiments 1-6 of the invention without residue as an emulsion breaking gel breaker, and the mass ratio of the emulsion fracturing fluid to the gel breaker is 100: 0.3 in a water bath at 60 ℃ for 12h, and after treatment, the experiment is carried out, and the experimental results are shown in Table 1.
TABLE 1 data relating to the tests applied to the products obtained in examples 1 to 6 of the present invention
| Appearance of gel breaking liquid | Apparent viscosity of gel breaking solution (mPa. s) | |
| Example 1 | Homogeneous, clear | 3.8 |
| Example 2 | Homogeneous, clear | 2.6 |
| Example 3 | Is uniform and clear | 3.1 |
| Example 4 | Homogeneous, clear | 2.5 |
| Example 5 | Homogeneous, clear | 2.6 |
| Example 6 | Homogeneous, clear | 2.8 |
。
Claims (5)
1. The emulsion breaking and breaking agent is characterized by comprising the following raw materials in percentage by mass: 8-10% of a nonionic demulsifier, 10-15% of persulfate, 1-3% of C10-16 sodium alkyl benzene sulfonate, 1-3% of fatty alcohol polyoxyethylene ether sodium sulfate, 3-5% of cocamidopropyl ammonium oxide, 5-10% of sodium chloride and the balance of water.
2. The emulsion fracturing fluid residue-free demulsification breaker according to claim 1, wherein: the nonionic demulsifier is at least one of fatty alcohol-polyoxyethylene ether AEO-3 and fatty alcohol-polyoxyethylene ether AEO-5.
3. The emulsion fracturing fluid residue-free demulsification gel breaker of claim 1, wherein: the persulfate is at least one of potassium persulfate and ammonium persulfate.
4. The emulsion fracturing fluid residue-free demulsification gel breaker of claim 1, wherein: the C10-16 sodium alkyl benzene sulfonate is sodium dodecyl benzene sulfonate, sodium undecyl benzene sulfonate, sodium dodecyl benzene sulfonate, sodium tridecyl benzene sulfonate, sodium tetradecyl benzene sulfonate, sodium pentadecyl benzene sulfonate or sodium hexadecyl benzene sulfonate.
5. The emulsion fracturing fluid residue-free demulsification gel breaker of claim 1, wherein the preparation method comprises the following steps:
a. firstly, weighing various raw materials according to the proportion of the emulsion breaking and gel breaking agent without residue in the emulsion fracturing fluid;
b. adding the weighed water into a reaction kettle with a stirrer, and then sequentially and slowly adding the weighed sodium chloride and persulfate under the stirring condition; after the mixture is completely dissolved, sequentially adding sodium alkyl benzene sulfonate, fatty alcohol-polyoxyethylene ether sodium sulfate, cocamidopropyl ammonium oxide and a nonionic demulsifier, and uniformly stirring to obtain the product, namely the emulsion breaking gel breaker without residues in the emulsion fracturing fluid.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210229656.5A CN114656946A (en) | 2022-03-09 | 2022-03-09 | Emulsion breaking and gel breaking agent for emulsion fracturing fluid without residues |
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| CN202210229656.5A CN114656946A (en) | 2022-03-09 | 2022-03-09 | Emulsion breaking and gel breaking agent for emulsion fracturing fluid without residues |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664048A (en) * | 2005-02-05 | 2005-09-07 | 大庆油田有限责任公司 | Fracturing working liquid for container rock containing travertine |
| CN103289668A (en) * | 2012-11-01 | 2013-09-11 | 湖北菲特沃尔科技有限公司 | Method for preparing fracturing fluid by utilizing seawater |
| CN103666439A (en) * | 2013-12-17 | 2014-03-26 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Seawater-based instant fracturing fluid and preparation method thereof |
| CN103740355A (en) * | 2014-01-08 | 2014-04-23 | 中国石油天然气股份有限公司 | High-salinity water-based modified xanthan gum fracturing fluid and preparation method thereof |
| CN103965857A (en) * | 2013-01-30 | 2014-08-06 | 中国石油天然气集团公司 | Preparation method of High-temperature water base fracturing fluid |
| CN106634935A (en) * | 2016-12-01 | 2017-05-10 | 中国石油天然气股份有限公司 | Slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation |
| CN108641700A (en) * | 2018-05-18 | 2018-10-12 | 陕西省石油化工研究设计院 | A kind of multiple-effect fracturing aid and the preparation method and application thereof |
| CN111574988A (en) * | 2020-05-19 | 2020-08-25 | 陕西省石油化工研究设计院 | Guar gum clean fracturing fluid for oil well and preparation method thereof |
-
2022
- 2022-03-09 CN CN202210229656.5A patent/CN114656946A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1664048A (en) * | 2005-02-05 | 2005-09-07 | 大庆油田有限责任公司 | Fracturing working liquid for container rock containing travertine |
| CN103289668A (en) * | 2012-11-01 | 2013-09-11 | 湖北菲特沃尔科技有限公司 | Method for preparing fracturing fluid by utilizing seawater |
| CN103965857A (en) * | 2013-01-30 | 2014-08-06 | 中国石油天然气集团公司 | Preparation method of High-temperature water base fracturing fluid |
| CN103666439A (en) * | 2013-12-17 | 2014-03-26 | 中国石油集团川庆钻探工程有限公司长庆井下技术作业公司 | Seawater-based instant fracturing fluid and preparation method thereof |
| CN103740355A (en) * | 2014-01-08 | 2014-04-23 | 中国石油天然气股份有限公司 | High-salinity water-based modified xanthan gum fracturing fluid and preparation method thereof |
| CN106634935A (en) * | 2016-12-01 | 2017-05-10 | 中国石油天然气股份有限公司 | Slippery water fracturing fluid with ultra-low interfacial tension with crude oil after degradation |
| CN108641700A (en) * | 2018-05-18 | 2018-10-12 | 陕西省石油化工研究设计院 | A kind of multiple-effect fracturing aid and the preparation method and application thereof |
| CN111574988A (en) * | 2020-05-19 | 2020-08-25 | 陕西省石油化工研究设计院 | Guar gum clean fracturing fluid for oil well and preparation method thereof |
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