CN111303848B - Anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent and preparation method thereof - Google Patents
Anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent and preparation method thereof Download PDFInfo
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Abstract
The invention discloses an anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent and a preparation method thereof, wherein the water shutoff profile control agent comprises a high-molecular modified polymer with the mass concentration of 0.2-1.0%, a cross-linking agent with the mass concentration of 0.3-2.0%, a cross-linking regulating agent with the mass concentration of 1.0-4.5%, a pH regulator with the mass concentration of 0.5-5.0%, a broad-spectrum bactericide with the mass concentration of 0.05-0.8% and the balance of water. The water shutoff profile control agent has good stability, realizes gelling in a low-temperature oil reservoir environment, has good jelly strength, does not generate chromatographic separation, and has good stability under the condition of high salinity. The water plugging profile control agent is suitable for aging for 180 days under the conditions of 25-50 ℃ and the mineralization degree of 15000mg/L, has a small dehydration phenomenon, has better integrity, the plugging rate reaches more than 97 percent, the gelling time is controllable within 25-110h, and the injectability is good.
Description
Technical Field
The invention relates to the technical field of oilfield chemistry, in particular to a chromatographic separation resistant low-temperature salt-tolerant oil reservoir water shutoff profile control agent and a preparation method thereof.
Background
At present, the oilfield exploitation in China enters the middle and later stages, most of the oilfield exploitation adopts a water-drive exploitation mode, and the injected water of the oilfield is increased. Because of the stratum heterogeneity, the oil field is easy to generate the phenomena of water channeling and water flooding, the oil recovery rate is seriously influenced, the oil reservoir water output is controlled, and the improvement of the oil recovery rate is deeply valued by the majority of oil workers.
In order to reduce the 'dead oil zone' for increasing the yield of the oil field, water shutoff and profile control are carried out on a large pore passage, the flow direction of injected water is changed, and the water injection sweep coefficient is increased. The gel water shutoff agent prepared by the reaction of the polymer and the crosslinking agent is widely applied to high-temperature water shutoff and profile control in oil fields, and has the advantages of simple construction, low cost, good gelling strength and the like. Because the low-temperature water shutoff profile control technology is a technical problem, the research on the low-temperature anti-chromatographic separation low-temperature salt-tolerant reservoir water shutoff profile control agent is relatively few. CN104194754A provides a temperature-resistant and salt-resistant HPAM/Cr3 +/phenolic aldehyde composite crosslinking weak gel profile control water shutoff agent and a preparation method thereof, and the agent has good gel strength and good stability at the temperature of 50-90 ℃. A HAMP/Cr3+ crosslinking system is also commonly used in low-temperature water shutoff profile control, but the system has certain limitation, and researches show that chromatographic separation is carried out in the system due to different migration speeds of HPAM and Cr3+ in a stratum, so that the gelling strength is low or gelling cannot be realized, and the crosslinking agent contains heavy metal ions and is polluted greatly. The water shutoff profile control agent for the anti-chromatographic separation low-temperature salt-tolerant oil reservoir, which has good biological stability under low-temperature conditions, is environment-friendly, does not generate chromatographic separation and has controllable gelling time, is developed, and has important application value.
Disclosure of Invention
The invention aims to provide a chromatographic separation resistant low-temperature salt-tolerant oil reservoir water shutoff profile control agent and a preparation method thereof.
Therefore, the invention provides a chromatographic separation resistant low-temperature salt-tolerant oil reservoir water shutoff profile control agent, which comprises 0.2-1.0% of high-molecular modified polymer, 0.3-2.0% of cross-linking agent, 1.0-4.5% of cross-linking regulating agent, 0.5-5.0% of pH regulator, 0.05-0.8% of broad-spectrum bactericide and the balance of water.
Preferably, the natural polymer modified polymer is modified guar gum, including one or more of hydroxypropyl guar gum, carboxymethyl guar gum and guar raw powder.
Preferably, the crosslinking agent is an organic titanium crosslinking agent and/or an organic boron crosslinking agent, and when the crosslinking agent is the organic titanium crosslinking agent and the organic boron crosslinking agent, the mass ratio of the organic titanium crosslinking agent to the organic boron crosslinking agent is 1:2-2: 1.
Preferably, the organic boron crosslinking agent is 3-aminobenzene boric acid grafted sodium alginate (ALG-PBA), the grafting rate is 10-50%, and the average molecular weight is 1000-6000.
Preferably, the crosslinking regulator is a mixture of urotropin and urea, the mass concentration of the urotropin is 0.05-0.5%, and the mass concentration of the urea is 0.8-4.0%.
Preferably, the broad-spectrum bactericide is an F-58 broad-spectrum bactericide and/or an F-63 broad-spectrum bactericide, and when the broad-spectrum bactericide is the F-58 broad-spectrum bactericide and the F-63 broad-spectrum bactericide, the mass ratio of the F-58 broad-spectrum bactericide to the F-63 broad-spectrum bactericide is 1:2-2: 1.
Preferably, the pH regulator is 10% hydrochloric acid solution in parts by weight.
The invention also provides a preparation method of the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent, which comprises the following steps: (1) placing the high-molecular modified polymer and the crosslinking regulating agent in a mortar and grinding uniformly to obtain a mixture; (2) adding the mixture obtained in the step (1) into water while stirring to obtain a first mixed solution; (3) adding a pH regulator into the first mixed solution obtained in the step (2) to obtain a second mixed solution; (4) adding an organic cross-linking agent into the second mixed solution obtained in the step (3) while stirring to obtain a third mixed solution; (5) and (4) adding the broad-spectrum bactericide into the third mixed solution in the step (4) while stirring to obtain a gel solution, and placing the gel solution in a water bath for aging to obtain the gel solution of the anti-chromatographic separation low-temperature salt-tolerant reservoir water plugging profile control agent.
Preferably, in the step (5), the aging temperature is 25-35 ℃, and the aging time is 150-200 d.
Compared with the prior art, the invention has the advantages and positive effects that: the invention provides a chromatographic separation resistant low-temperature salt-tolerant oil reservoir water shutoff profile control agent and a preparation method thereof, wherein the chromatographic separation resistant low-temperature salt-tolerant oil reservoir water shutoff profile control agent comprises a high-molecular modified polymer with the mass concentration of 0.2-1.0%, a cross-linking agent with the mass concentration of 0.3-2.0%, a cross-linking regulating agent with the mass concentration of 1.0-4.5%, a pH regulating agent with the mass concentration of 0.5-5.0%, a broad-spectrum bactericide with the mass concentration of 0.05-0.8% and the balance of water. The anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent disclosed by the invention is good in stability, realizes gelling in a low-temperature oil reservoir environment, is good in jelly strength, does not generate chromatographic separation, and is good in stability under a high salinity condition. The water shutoff agent is suitable for aging for 180 days under the conditions of 25-50 ℃ and the mineralization degree of 15000mg/L, has a small dehydration phenomenon (the dehydration amount is less than 10 percent), has better integrity, the shutoff rate reaches more than 97 percent, the gelling time is controllable within 25-110h, the injectability is good, and can effectively block a large pore path or a high permeable layer and increase the water injection wave and area.
Other features and advantages of the present invention will become more apparent upon reading of the following detailed description of the invention in conjunction with the accompanying drawings.
Drawings
FIG. 1 is an optical photograph of the anti-chromatographic low-temperature salt-tolerant reservoir water shutoff profile control agent of example 1 of the present invention aged 180d at 30 ℃;
FIG. 2 is an optical photograph of the anti-chromatographic low-temperature salt-tolerant reservoir water shutoff profile control agent of example 2 of the present invention aged 180 days at 30 ℃.
Detailed Description
The following detailed description of the present invention is provided to illustrate and explain the present invention and should not be taken as limiting the scope of the present invention.
The anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent comprises a high-molecular modified polymer with the mass concentration of 0.2-1.0%, a cross-linking agent with the mass concentration of 0.3-2.0%, a cross-linking regulating agent with the mass concentration of 1.0-4.5%, a pH regulator with the mass concentration of 0.5-5.0%, a broad-spectrum bactericide with the mass concentration of 0.05-0.8% and the balance of water.
The anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent disclosed by the invention is good in stability, realizes gelling in a low-temperature oil reservoir environment, is good in jelly strength, does not generate chromatographic separation, and is good in stability under a high salinity condition. The water shutoff agent is suitable for aging for 180 days under the conditions of 25-50 ℃ and the mineralization degree of 15000mg/L, has a small dehydration phenomenon (the dehydration amount is less than 10 percent), has better integrity, the shutoff rate reaches more than 97 percent, the gelling time is controllable within 25-110h, the injectability is good, and can effectively block a large pore path or a high permeable layer and increase the water injection wave and area.
The natural polymer modified polymer is modified guar gum, including one or more of hydroxypropyl guar gum, carboxymethyl guar gum and guar raw powder. The natural polymer modified guar gum is easy to biodegrade, has high crosslinking speed and forms a compact three-dimensional reticular jelly structure.
The crosslinking agent is an organic titanium crosslinking agent and/or an organic boron crosslinking agent, and when the crosslinking agent is the organic titanium crosslinking agent and the organic boron crosslinking agent, the mass ratio of the organic titanium crosslinking agent to the organic boron crosslinking agent is 1:2-2: 1.
The organotitanium crosslinking agent may be gamma aminopropyl titanosilicate pentaerythritol and/or triethanolamine-based cyclobutyl titanate.
The organic boron crosslinking agent is 3-aminobenzene boric acid grafted sodium alginate (ALG-PBA), the grafting rate is 10-50%, the average molecular weight is 1000-6000, so that the organic boron crosslinking agent can form a plurality of crosslinking structure binding sites, and the stability of the gel can be improved.
The cross-linking regulating agent is a mixture of urotropine and urea, the mass concentration of the urotropine is 0.05-0.5%, and the mass concentration of the urea is 0.8-4.0%.
The broad-spectrum bactericide is an F-58 broad-spectrum bactericide and/or an F-63 broad-spectrum bactericide, and when the broad-spectrum bactericide is the F-58 broad-spectrum bactericide and the F-63 broad-spectrum bactericide, the mass ratio of the F-58 broad-spectrum bactericide to the F-63 broad-spectrum bactericide is 1:2-2: 1.
The pH regulator is 10% hydrochloric acid solution in parts by weight, the pH range is about 3.0-6.0, and the jelly solution is acidic, so that the jelly solution does not generate a crosslinking reaction, and the stability of the jelly can be improved.
The preparation method of the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent comprises the following steps:
(1) placing the high-molecular modified polymer and the crosslinking regulating agent in a mortar and grinding uniformly to obtain a mixture;
(2) adding the mixture obtained in the step (1) into water while stirring to obtain a first mixed solution;
(3) adding a pH regulator into the first mixed solution obtained in the step (2) to obtain a second mixed solution;
(4) adding an organic cross-linking agent into the second mixed solution obtained in the step (3) while stirring to obtain a third mixed solution;
(5) and (4) adding a broad-spectrum bactericide into the third mixed solution in the step (4) while stirring to obtain a gel solution, and aging the gel solution in a water bath to obtain the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water plugging profile control agent gel solution, wherein the aging temperature is 25-35 ℃, and the aging time is 150-200 d.
Example 1
(1) Putting 0.6g of hydroxypropyl guar gum, 0.1g of urotropine and 2.0g of urea in a mortar for fully grinding to obtain a mixture;
(2) adding the mixture obtained in the step (1) into 95.7g of simulated water while stirring, and stirring for 20min to obtain a first mixed solution;
(3) adding 0.7g of 10% hydrochloric acid solution into the first mixed solution obtained in the step (2), and stirring for 5min to obtain a second mixed solution;
(4) adding 0.6g of organic titanium cross-linking agent gamma-aminopropyl titanium silicic acid pentaerythritol into the second mixed solution obtained in the step (3) while stirring, and stirring for 5min to obtain a third mixed solution;
(5) and (4) adding 0.15g of broad-spectrum bactericide F-58 broad-spectrum bactericide into the third mixed solution in the step (4) while stirring, and stirring for 3min to obtain the gel liquid.
1.1 placing the jelly liquid in a closed container, respectively placing in a water bath with the temperature of 25 ℃, 30 ℃, 40 ℃ and 50 ℃ for standing to obtain the water plugging profile control agent, wherein the gelling performance of the corresponding chromatographic separation resistant low-temperature salt-tolerant oil reservoir water plugging profile control agent is shown in table 1.
TABLE 1
| Temperature/. degree.C | 25 | 30 | 40 | 50 |
| Gelling time/h | 108 | 87 | 56 | 28 |
| Strength grade | G | H | H | I |
The results in Table 1 show that the chromatographic separation resistant low-temperature salt-tolerant reservoir water plugging profile control agent prepared in the embodiment has good gel strength under low-temperature and high-salt conditions, the strength grade is G-I, and the gel forming time can be adjusted within 28-108 h.
1.2, aging the gel liquid in a water bath environment at 30 ℃ for a long time to obtain the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent, and periodically measuring the strength change and the water separation amount of the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent, wherein the results are shown in Table 2.
TABLE 2
| Standing time/d | 5 | 15 | 50 | 90 | 120 | 180 |
| Intensity rating | H | H | H | H | H | H |
| Water content/%) | 0 | 0 | 0 | 0 | 1.2 | 4.1 |
The results in Table 2 show that the gel is aged for a long time under the low-temperature condition, almost no water is separated within 90 days, and the gel begins to separate slightly after 120 days, which shows that the chromatographic separation resistant low-temperature salt-tolerant oil reservoir water shutoff profile control agent has good stability.
1.3 detecting the chromatographic separation condition of the gel liquid, the experimental steps comprise:
1) filling quartz sand into a sand filling pipe with the inner diameter of 25mm and the length of 2500 mm;
2) saturating the sand filling pipe with tap water at the flow rate of 10mL/min, and measuring the pore volume;
3) then slowly injecting 3-4PV gel liquid into the sand filling pipe at the flow rate of 5mL/min, and observing the liquid outlet condition at the outlet end of the sand filling pipe;
4) collecting the driven jelly liquid in the displacement process, subpackaging the jelly liquid collected at the liquid outlet end into different sealed containers, and placing in a constant-temperature water bath at 30 ℃ to observe gelling time and gelling strength, wherein the experimental results are shown in table 3.
TABLE 3
| Injection PV | 1.08 | 1.36 | 1.63 | 1.91 | 2.18 | 2.45 |
| Gelling time/h | 91 | 88 | 86 | 84 | 85 | 87 |
| Strength grade | H | H | H | H | H | H |
The experimental result shows that the gel forming time and the gel forming strength of the gel plugging agent have no obvious change under the low temperature condition, and the gel plugging agent has no chromatographic separation phenomenon in the stratum and no obvious adsorption effect on each component by the stratum.
1.4 detecting the plugging performance of the gel plugging agent, the experimental steps are as follows:
1) filling quartz sand into a sand filling pipe with the inner diameter of 25mm and the length of 500mm, vacuumizing the sand filling pipe, and performing tap water saturation treatment;
2) the pressure at the inlet end of the sand filling pipe is stable in a 2ml/min water injection mode, the sand filling pipe is continuously saturated for 2 hours, and the initial permeability (k) of the sand filling pipe is calculated0/)；
3) And injecting the gel liquid into the sand filling pipe at a constant flow of 2ml/min, and continuously injecting the water plugging agent 4PV after the pressure at the inlet end of the sand filling pipe is stable, and stopping injecting the liquid. Keeping the temperature of the system at 30 ℃, and preparing the glue for 3 d;
4) positive direction water injection displacement, when the pressure at the inlet end is stable, calculating the permeability (k) of the sand filling pipe after plugging1/). According to the calculation formula:
the plugging rate γ was calculated and the experimental results are shown in table 4.
TABLE 4
The result shows that the gel plugging agent of the embodiment has good plugging performance and good pressure resistance, and can effectively plug the dominant channel or the high permeability layer in the stratum.
Example 2
(1) Putting 0.6g of hydroxypropyl guar gum, 0.1g of urotropine and 3.0g of urea in a mortar for fully grinding to obtain a mixture;
(2) adding the mixture obtained in the step (1) into 65.6g of simulated water while stirring, and stirring for 20min to obtain a first mixed solution;
(3) adding 30g of 1% hydrochloric acid solution into the first mixed solution obtained in the step (2), and stirring for 5min to obtain a second mixed solution;
(4) adding 0.6g of organic boron crosslinking agent 3-aminobenzene boric acid grafted sodium alginate (ALG-PBA) into the second mixed solution in the step (3) while stirring, wherein the grafting rate of the ALG-PBA is 3 percent, the average molecular weight is 4000, and stirring for 5min to obtain a third mixed solution;
(5) and (4) adding 0.15g of F-63 broad-spectrum bactericide into the third mixed solution in the step (4) while stirring, and stirring for 3min to obtain the gel liquid.
2.1 respectively placing the jelly glue liquid into different closed containers, and respectively placing the containers in water bath at 25 ℃, 30 ℃, 40 ℃ and 50 ℃ for standing to obtain the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent. The gelling performance of the gel plugging agent of the embodiment under the conditions of 25-50 ℃ and the mineralization degree of 15000mg/L stratum environment is detected, and the results are shown in Table 5.
TABLE 5
| Temperature/. degree.C | 25 | 30 | 40 | 50 |
| Gelling time/h | 102 | 93 | 49 | 34 |
| Strength grade | G | F | F | E |
The results in Table 5 show that the gel plugging agent prepared by the embodiment has good gel strength under low-temperature and high-salt conditions, the strength grade is E-G, and the gel forming time is adjustable within 34-102 h.
2.2, aging the jelly glue liquid in a water bath environment at 30 ℃ for a long time to obtain the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent, and periodically measuring the strength change and the water separation amount of the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent, wherein the results are shown in Table 6.
TABLE 6
| Standing time/d | 5 | 15 | 50 | 90 | 120 | 180 |
| Intensity level | H | H | H | H | H | H |
| Water content/%) | 0 | 0 | 0 | 0 | 1.2 | 4.1 |
The results in Table 6 show that the gel is aged for a long time under the low-temperature condition, almost no water is separated within 90 days, the gel begins to separate slightly after 120 days, and the total amount of water separated is lower than 7 percent, which indicates that the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent has good stability.
2.3 the chromatographic separation of the cryogel solutions was examined using the same experimental procedure as 1.3 of example 1 and the results are given in Table 7.
TABLE 7
| Injection PV | 1.12 | 1.43 | 1.75 | 2.07 | 2.38 | 2.70 |
| Gelling time/h | 95 | 91 | 94 | 93 | 92 | 93 |
| Strength grade | F | F | F | F | F | F |
The experimental result shows that the gel forming time and the gel forming strength of the gel plugging agent have no obvious change under the low temperature condition, and the gel plugging agent has no chromatographic separation phenomenon in the stratum and no obvious adsorption effect on each component by the stratum.
2.4 detecting the plugging performance of the jelly water plugging agent, the experimental steps are similar to those of 1.4 of the example 1, and the experimental results are shown in a table 8.
TABLE 8
Fig. 1 and fig. 2 are optical photographs of the chromatographic separation resistant low-temperature salt-tolerant reservoir water shutoff profile control agent of example 1 and example 2 after being aged for 180d at 30 ℃, and it can be seen from the photographs that the chromatographic separation resistant low-temperature salt-tolerant reservoir water shutoff profile control agent has a small dehydration phenomenon (the dehydration amount is less than 10%), and has better integrity.
Example 3
(1) Putting 0.6g of hydroxypropyl guar gum, 0.1g of urotropine and 2.0g of urea in a mortar for fully grinding to obtain a mixture;
(2) adding the mixture obtained in the step (1) into 89.6g of simulated water while stirring, and stirring for 20min to obtain a first mixed solution;
(3) adding 0.7g of 10% hydrochloric acid solution into the first mixed solution obtained in the step (2), and stirring for 5min to obtain a second mixed solution;
(4) adding 0.3g of gamma aminopropyl titanium pentaerythrityl silicate serving as an organic titanium crosslinking agent and 3-aminophenylboronic acid grafted sodium alginate (ALG-PBA) serving as an organic boron crosslinking agent into the second mixed solution obtained in the step (3) while stirring, wherein the grafting ratio of the ALG-PBA is 30%, and the average molecular weight is 4000, and stirring for 5min to obtain a third mixed solution;
(5) and (4) adding 0.05g of F-63 broad-spectrum bactericide and 0.1g of F-58 broad-spectrum bactericide into the third mixed solution in the step (4) while stirring, and stirring for 3min to obtain the gel liquid.
3.1 placing the jelly liquid in a closed container, respectively placing in a water bath with the temperature of 25 ℃, 30 ℃, 40 ℃ and 50 ℃ for standing to obtain the water plugging profile control agent, wherein the gelling performance of the corresponding chromatographic separation resistant low-temperature salt-tolerant oil reservoir water plugging profile control agent is shown in Table 9.
TABLE 9
| Temperature/. degree.C | 25 | 30 | 40 | 50 |
| Gelling time/h | 105 | 87 | 56 | 30 |
| Strength grade | G | H | H | I |
The results in Table 9 show that the chromatographic separation resistant low-temperature salt-tolerant reservoir water plugging profile control agent prepared in the embodiment has good gel strength under low-temperature and high-salt conditions, the strength grade is G-I, and the gel forming time can be adjusted within 30-105 h.
3.2 placing the jelly glue liquid in a water bath environment at 30 ℃ for long-time aging to obtain the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent, periodically measuring the strength change and the water separation amount of the anti-chromatographic separation low-temperature salt-tolerant oil reservoir water shutoff profile control agent, and obtaining the results shown in Table 10.
| Standing time/d | 5 | 15 | 50 | 90 | 120 | 180 |
| Intensity rating | H | H | H | H | H | H |
| Water content/%) | 0 | 0 | 0 | 0 | 1.7 | 5.2 |
The results in Table 10 show that the gel is aged for a long time under the low-temperature condition, almost no water is separated within 90 days, and the gel begins to separate slightly after 120 days, which shows that the chromatographic separation resistant low-temperature salt-tolerant oil reservoir water shutoff profile control agent has good stability.
3.3 the chromatographic separation of the cryogel solutions was examined using the same experimental procedure as 1.3 of example 1 and the results are given in Table 11.
TABLE 11
| Injection PV | 1.08 | 1.36 | 1.63 | 1.91 | 2.18 | 2.45 |
| Gelling time/h | 91 | 87 | 86 | 84 | 85 | 87 |
| Strength grade | G | G | G | G | G | G |
The experimental result shows that the gel forming time and the gel forming strength of the gel plugging agent have no obvious change under the low temperature condition, and the gel plugging agent has no chromatographic separation phenomenon in the stratum and no obvious adsorption effect on each component by the stratum.
3.4 detecting the plugging performance of the jelly water plugging agent, the experimental steps are similar to those of 1.4 of the example 1, and the experimental results are shown in a table 12.
TABLE 12
The mineralization degree water in the examples is simulated water, and the total mineralization degree is 15000 mg/L. In the examples, the jelly strength was evaluated by a visual code method, and the code grades are shown in Table 13.
Watch 13
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described in the foregoing embodiments, or equivalents may be substituted for some of the features thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (3)
1. A low-temperature salt-tolerant oil reservoir water shutoff profile control agent with resistance to chromatographic separation is characterized in that,
comprises 0.2 to 1.0 mass percent of high molecular modified polymer, 0.3 to 2.0 mass percent of cross-linking agent, 1.0 to 4.5 mass percent of cross-linking regulating agent, 0.5 to 5.0 mass percent of pH regulator, 0.05 to 0.8 mass percent of broad-spectrum bactericide and the balance of water;
the high molecular modified polymer is modified guar gum, including one or more of hydroxypropyl guar gum and carboxymethyl guar gum;
the cross-linking agent is an organic titanium cross-linking agent and/or an organic boron cross-linking agent,
when the crosslinking agent is an organic titanium crosslinking agent and an organic boron crosslinking agent, the mass ratio of the organic titanium crosslinking agent to the organic boron crosslinking agent is 1:2-2: 1;
the organic boron crosslinking agent is 3-aminobenzene boric acid grafted sodium alginate (ALG-PBA), the grafting rate is 10-50%, and the average molecular weight is 1000-6000;
the cross-linking regulating agent is a mixture of urotropine and urea, the mass concentration of the urotropine is 0.05-0.5%, and the mass concentration of the urea is 0.8-4.0%;
the broad-spectrum bactericide is F-58 broad-spectrum bactericide and/or F-63 broad-spectrum bactericide,
when the broad-spectrum bactericide is an F-58 broad-spectrum bactericide and an F-63 broad-spectrum bactericide, the mass ratio of the F-58 broad-spectrum bactericide to the F-63 broad-spectrum bactericide is 1:2-2: 1;
the pH regulator is 10% hydrochloric acid solution in parts by weight.
2. The preparation method of the chromatographic separation resistant low-temperature salt-tolerant reservoir water shutoff profile control agent according to claim 1, wherein the method comprises the following steps:
(1) placing the high-molecular modified polymer and the crosslinking regulating agent in a mortar and grinding uniformly to obtain a mixture;
(2) adding the mixture obtained in the step (1) into water while stirring to obtain a first mixed solution;
(3) adding a pH regulator into the first mixed solution obtained in the step (2) to obtain a second mixed solution;
(4) adding an organic cross-linking agent into the second mixed solution in the step (3) while stirring to obtain a third mixed solution;
(5) and (4) adding the broad-spectrum bactericide into the third mixed solution in the step (4) while stirring to obtain a gel solution, and placing the gel solution in a water bath for aging to obtain the gel solution of the anti-chromatographic separation low-temperature salt-tolerant reservoir water plugging profile control agent.
3. The preparation method of the anti-chromatographic separation low-temperature salt-tolerant reservoir water shutoff profile control agent according to claim 2,
in the step (5), the aging temperature is 25-35 ℃, and the aging time is 150-200 d.
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| CN105754578A (en) * | 2016-03-22 | 2016-07-13 | 中国石油大学(华东) | Nano-titanium crosslinking agent for fracturing fluids as well as preparation method and application of nano-titanium crosslinking agent |
| CN106479466A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of profile-controlling and plugging agent and its preparation method and application |
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| CN106479466A (en) * | 2015-08-31 | 2017-03-08 | 中国石油化工股份有限公司 | A kind of profile-controlling and plugging agent and its preparation method and application |
| CN105754578A (en) * | 2016-03-22 | 2016-07-13 | 中国石油大学(华东) | Nano-titanium crosslinking agent for fracturing fluids as well as preparation method and application of nano-titanium crosslinking agent |
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