CN109679603B - Composite ionic polymer gel and preparation method thereof - Google Patents
Composite ionic polymer gel and preparation method thereof Download PDFInfo
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- CN109679603B CN109679603B CN201811453967.XA CN201811453967A CN109679603B CN 109679603 B CN109679603 B CN 109679603B CN 201811453967 A CN201811453967 A CN 201811453967A CN 109679603 B CN109679603 B CN 109679603B
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- 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
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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Abstract
The invention relates to a composite ionic polymer gel and a preparation method thereof, which are mainly used for blocking high-permeability strips or large pore paths in a reservoir in the oil field development process. The gel system comprises, by mass, 100% of water, 3.4-6.0% of acrylamide, 1.0-3.0% of polyaluminum chloride, 0.06-0.4% of N, N-methylene bisacrylamide, 0.05-0.4% of ammonium persulfate and 0.8-1.5% of urea. And injecting the gel system into a stratum or a rock core, and waiting for setting for 1-120 h. The gel is suitable for oil reservoir temperature range of 25-100 ℃, and the gel forming time can be adjusted within 1-120 h. The initial viscosity of the composite ionic polymer gel is lower than 10mPa.s before gelling, the composite ionic polymer gel can generate a crosslinking reaction in the rock pores of the reservoir, and the formed gel has excellent plugging property and stability and is suitable for plugging high-permeability strips or large pore passages in the reservoir.
Description
Technical Field
The invention relates to a composite ionic polymer gel and a preparation method thereof, which are mainly used for blocking high-permeability strips or large pore paths in a reservoir in the oil field development process.
Background
Most of oil fields at home and abroad adopt a water injection development mode, and at present, the main oil fields at home enter the development period of high water content or ultrahigh water content. After long-term high-strength water injection or polymer injection scouring, part of the rock structure of the reservoir is damaged, so that the rock cement and framework particles are moved, and further a high-permeability strip or a large pore channel is formed in a near wellbore area, so that the reservoir heterogeneity is further enhanced, the injected water or the oil displacement agent enters along the large pore channel suddenly, low-efficiency or ineffective circulation is formed, and finally the medium-low permeability layer sweep efficiency and the recovery rate are reduced. Therefore, how to reduce the inefficient and ineffective circulation of injected water in high permeability strips or large pore channels and increase the swept volume of medium and low permeability layers becomes one of the major technical problems in the oil field development process. At present, the plugging agent for treating high-permeability strips or large pore canals in oil fields mainly comprises polymer gel, starch graft copolymer gel and the like, wherein the former has low strength and is difficult to adapt to the technical requirements of large pore canals; the latter has obviously improved strength performance, but has higher initial viscosity and poorer injectability, and is easy to cause damage to non-target layers. Therefore, the development of a gel system with high plugging strength, good injectivity and low cost is urgently needed in oil field production.
Disclosure of Invention
The invention aims to solve the problem of the insufficient performance of the existing plugging agent and develop a composite ionic polymer gel and a preparation method thereof. The gel consists of a main agent, an inorganic and organic crosslinking agent and an auxiliary agent, wherein the main agent is acrylamide, the inorganic crosslinking agent is polyaluminium chloride, the organic crosslinking agent is N, N-methylene bisacrylamide, and the auxiliary agent is urea and ammonium persulfate.
The gel system comprises the following components in percentage by mass:
the following substances and contents are added, measured with water as 100%:
3.4 to 6.0 percent of acrylamide,
1.0 to 3.0 percent of polyaluminium chloride,
0.06-0.4 percent of N, N-methylene bisacrylamide,
0.05 to 0.4 percent of ammonium persulfate,
0.8 to 1.5 percent of urea.
The preparation steps of the composite ionic polymer gel are as follows:
(1) weighing a certain volume of solvent water, wherein the solvent water can be oil field production sewage or clean water is injected;
(2) weighing various components according to the formula;
(3) dispersing polyaluminum chloride into solvent water, and uniformly stirring to obtain a polyaluminum chloride solution;
(4) adding urea into a polyaluminum chloride solution, and uniformly stirring to obtain a mixed solution;
(5) and uniformly mixing acrylamide, N-methylene bisacrylamide and ammonium persulfate, adding the mixture into the mixed solution, and uniformly stirring to obtain a gel system.
Injecting the gel system into a stratum or a rock core, and waiting for setting for 1-120 h; the temperature range of the oil reservoir is 25-100 ℃; the gelling time can be adjusted within 1-120 h.
The initial viscosity of the composite ionic polymer gel is lower than 10mPa.s before gelling, the composite ionic polymer gel can generate a crosslinking reaction in the rock pores of the reservoir, and the formed gel has excellent plugging property and stability and is suitable for plugging high-permeability strips or large pore passages in the reservoir.
Compared with the existing polymer gel and starch graft copolymer gel, the gel has the following advantages: (1) the temperature resistance (25-100 ℃) and the stability are strong; (2) the initial viscosity before gelling is lower than 10mPa.s, and the injectability is better; (3) the gel forming effect in the pores of the reservoir rock is better, and the plugging strength is higher; (4) wide raw material source, low cost and good technical and economic effects.
Drawings
FIG. 1: characteristic curve of plugging effect.
Detailed Description
Example 1:
(1) preparing injection simulated water according to the ion composition in the table 1 to obtain solvent water;
(2) 100g of solvent water and 1.0g of polyaluminum chloride (1.0% polyaluminum chloride) were weighed;
(3) dispersing polyaluminum chloride into solvent water, and uniformly stirring to obtain a polyaluminum chloride solution;
(4) adding 0.8% (0.8g) of urea into the polyaluminium chloride solution, and uniformly stirring to obtain a mixed solution;
(5) weighing 3.4% (3.4g) acrylamide, 0.06% (0.06g) N, N-methylene bisacrylamide and 0.05% (0.05g) ammonium persulfate, mixing uniformly, adding the mixture into the mixed solution, and stirring uniformly to obtain a gel system.
Example 2
(1) Preparing injection simulated water according to the ion composition in the table 1 to obtain solvent water;
(2) weighing a volume of solvent water and 2.0% polyaluminium chloride (in the example 100g water and 2.0g polyaluminium chloride);
(3) dispersing polyaluminum chloride into solvent water, and uniformly stirring to obtain a polyaluminum chloride solution;
(4) adding 1.0 percent (1.0g) of urea into the polyaluminium chloride solution, and uniformly stirring to obtain a mixed solution;
(5) weighing 5.0% (10.0g) acrylamide, 0.3% (0.3g) ammonium persulfate and 0.3% (0.3g) N, N-methylene-bisacrylamide, uniformly mixing, adding the mixture into the mixed solution, and uniformly stirring to obtain a gel system.
Example 3
(1) Preparing injection simulated water according to the ion composition in the table 1 to obtain solvent water;
(2) weighing a volume of solvent water and 3.0% polyaluminium chloride (in the example 100g water and 3.0g polyaluminium chloride);
(3) dispersing polyaluminum chloride into solvent water, and uniformly stirring to obtain a polyaluminum chloride solution;
(4) adding 1.5 percent (1.5g) of urea into the polyaluminium chloride solution, and uniformly stirring to obtain a mixed solution;
(5) weighing 6.0% (6.0g) acrylamide, 0.4% (0.4g) ammonium persulfate and 0.4% (0.4g) N, N-methylene-bisacrylamide, uniformly mixing, adding the mixture into the mixed solution, and uniformly stirring to obtain a gel system.
TABLE 1 Water quality analysis Table
Example 4
(1) Weighing a volume of tap water and 3.0% polyaluminium chloride (in the example 100g of water and 3.0g of polyaluminium chloride);
(2) dispersing polyaluminum chloride into solvent water, and uniformly stirring to obtain a polyaluminum chloride solution;
(3) adding 1.5 percent (1.5g) of urea into the polyaluminium chloride solution, and uniformly stirring to obtain a mixed solution;
(4) weighing 6.0% (6.0g) acrylamide, 0.4% (0.4g) ammonium persulfate and 0.4% (0.4g) N, N-methylene-bisacrylamide, uniformly mixing, adding the mixture into the mixed solution, and uniformly stirring to obtain a gel system.
2. Composite ionic gel performance test
(1) Viscosity of the solution
The results of the test of the relationship between the viscosity of the composite ionic gel system and the time are shown in Table 2.
TABLE 2 example 1 results of viscosity test (mPas)
Table 3 example 2 results of viscosity test (mPa · s)
Table 4 example 3 viscosity test results (mPa · s)
TABLE 5 example 4 results of viscosity test (mPas)
As can be seen from tables 2-5, the initial viscosity of the complex ionic gel system is lower than 10.0 mPa.s, and the viscosity after gelling exceeds 10X 104The mPa & s, the type of injected water, has no influence on the gelling effect of the composite ionic gel system.
(2) Comparison of gelling effects of different types of gel systems
The results of the comparative experiments on the gelling effect of different types of gel systems in the rock core are shown in table 6, and the relation between the injection pressure and the PV number is shown in fig. 1. (selection of composite Ionic gel vs. starch glue)
TABLE 6 static gelling Experimental Effect
As can be seen from Table 6, the composite ion gel system showed better injectability at the gel injection stage due to lower injection pressure (pressure gradient) compared to the starch graft copolymer gel system. In the subsequent water flooding stage, the injection pressure (pressure gradient) of the composite ion gel system is far higher than that of the starch graft copolymer gel system. In conclusion, the composite ionic gel system has strong injection capability and good blocking effect (see fig. 1).
3. Evaluation of technical and economic effects
Compared with the existing starch graft copolymer gel cost, the composite ionic gel medicament has lower cost of 1m3The use cost of the working solution can be reduced by 20%, and the technical and economic effects are good.
In conclusion, the initial viscosity of the prepared composite ionic polymer gel system is low (the viscosity is less than 10mPa & s), the gelling time is controllable within 1-120 h by adjusting the formula of the system at 25-100 ℃, the gelling strength is greater than 10 ten thousand mPa & s, and the composite ionic polymer gel system is suitable for plugging high-permeability strips or large pore channels in a reservoir; compared with the common plugging agent for oil fields, the composite ionic gel system has lower total price and better economic effect.
Claims (3)
1. A complex ionic polymer gel; the water-based paint is characterized by being measured by taking water as 100%, and comprising the following components in percentage by mass:
3.4 to 6.0 percent of acrylamide,
1.0 to 3.0 percent of polyaluminium chloride,
0.06-0.4 percent of N, N-methylene bisacrylamide,
0.05 to 0.4 percent of ammonium persulfate,
0.8 to 1.5 percent of urea;
the preparation method of the composite ionic polymer gel comprises the following steps:
(1) weighing a certain volume of solvent water;
(2) weighing various components according to the composition and content of the formula;
(3) dispersing polyaluminum chloride into solvent water, and uniformly stirring to obtain a polyaluminum chloride solution;
(4) adding urea into a polyaluminum chloride solution, and uniformly stirring to obtain a mixed solution;
(5) and uniformly mixing acrylamide, N-methylene bisacrylamide and ammonium persulfate, adding the mixture into the mixed solution, and uniformly stirring to obtain a gel system.
2. A process for the preparation of the complex ionic polymer gel of claim 1, characterized by the steps of:
(1) weighing a certain volume of solvent water;
(2) weighing various components according to the composition and content of the formula;
(3) dispersing polyaluminum chloride into solvent water, and uniformly stirring to obtain a polyaluminum chloride solution;
(4) adding urea into a polyaluminum chloride solution, and uniformly stirring to obtain a mixed solution;
(5) and uniformly mixing acrylamide, N-methylene bisacrylamide and ammonium persulfate, adding the mixture into the mixed solution, and uniformly stirring to obtain a gel system.
3. The method of claim 2, wherein the solvent water is oil field production wastewater or clean water.
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| CN113234425B (en) * | 2021-04-09 | 2023-02-28 | 中国石油大学(华东) | Composite aluminum gel plugging agent for deep profile control of medium-low permeability oil reservoir and preparation method and application thereof |
Citations (4)
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|---|---|---|---|---|
| CN104178098A (en) * | 2014-08-01 | 2014-12-03 | 克拉玛依市正诚有限公司 | High-strength gel profile control and plugging agent as well as preparation method and application method thereof |
| CN105712865A (en) * | 2014-12-02 | 2016-06-29 | 中国石油天然气股份有限公司 | Solid aluminum citrate cross-linking agent, and preparation method and application thereof |
| CN107986418A (en) * | 2017-12-29 | 2018-05-04 | 柴建锋 | A kind of aluminium polychloride modified PVC base flocculant and preparation method thereof |
| CA2864955C (en) * | 2012-03-16 | 2019-12-24 | Clariant International Ltd | Method for reducing negative effects of natural pitch contaminants in both pulping and papermaking operations |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2864955C (en) * | 2012-03-16 | 2019-12-24 | Clariant International Ltd | Method for reducing negative effects of natural pitch contaminants in both pulping and papermaking operations |
| CN104178098A (en) * | 2014-08-01 | 2014-12-03 | 克拉玛依市正诚有限公司 | High-strength gel profile control and plugging agent as well as preparation method and application method thereof |
| CN105712865A (en) * | 2014-12-02 | 2016-06-29 | 中国石油天然气股份有限公司 | Solid aluminum citrate cross-linking agent, and preparation method and application thereof |
| CN107986418A (en) * | 2017-12-29 | 2018-05-04 | 柴建锋 | A kind of aluminium polychloride modified PVC base flocculant and preparation method thereof |
Non-Patent Citations (1)
| Title |
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| 聚合氯化铝/聚丙烯酰胺复合絮凝剂处理废水的研究;肖春妹等;《黎明职业大学学报》;20100930;28-30 * |
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