CN115074099B - Emulsion type acidolysis blocking remover and preparation method thereof - Google Patents
Emulsion type acidolysis blocking remover and preparation method thereof Download PDFInfo
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- C09K8/524—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning organic depositions, e.g. paraffins or asphaltenes
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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
- C09K8/52—Compositions for preventing, limiting or eliminating depositions, e.g. for cleaning
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Abstract
The invention relates to the technical field of oil well reservoir blocking removal, and provides an emulsion type acidolysis blocking remover. The blocking remover provided by the invention consists of a continuous phase and a disperse phase; the continuous phase is composed of organic acid, water and surfactant; the disperse phase consists of asphalt dispersant and oil phase. The organic acid in the emulsion type acidizing and plugging removing agent prepared by the invention is a continuous phase, and the emulsion type acidizing and plugging removing agent can be injected into the ground to remove inorganic scales such as calcium carbonate and the like; the asphalt dispersing agent is encapsulated in emulsion oil drops, can be controllably released when being injected into an underground reservoir, and acts on organic scales such as asphalt sediment and the like in cooperation with oil substances, so that the plugging removing agent provided by the invention can simultaneously erode inorganic scales and organic scales, and has remarkable plugging removing effect. In addition, the plugging remover prepared by the method has small corrosiveness to equipment because the preparation raw materials do not contain inorganic acid, and can effectively improve the recovery ratio.
Description
Technical Field
The invention relates to the technical field of oil well reservoir blocking removal, in particular to an emulsion type acidolysis blocking remover and a preparation method thereof.
Background
Well bore blockage often occurs in the middle and later stages of hydrocarbon production, severely affecting hydrocarbon production. The well hole blockage is mainly caused by inorganic scale, organic scale or mixed scale formed by the inorganic scale and the organic scale, wherein the main components of the inorganic scale are carbonate and sulfate formed by calcium and magnesium ions, and the main components of the organic scale are cementing bodies formed by organic matters such as asphaltene. Well bore blockage due to scaling can present a number of hazards to production, resulting in reduced production and compromising production safety. Therefore, a blocking remover is needed to solve the blocking problem caused by scaling.
The traditional blocking remover is an acidification blocking remover, the main components of the traditional blocking remover are hydrochloric acid and earthic acid (prepared by mixing 10-15% of hydrochloric acid and 3-8% of hydrofluoric acid), the acidification blocking remover can erode rock in use, the erosion speed is high, the traditional blocking remover can not permeate deep layers, only inorganic scale in near-wellbore areas can be removed, the effect of the traditional blocking remover on organic scale is not ideal, and the traditional blocking remover can cause great corrosion to metal pipelines and cause difficulty to follow-up work. Patent CN 105505360A discloses a fluoboric acid blocking remover which consists of a pre-acid, a main acid and a post-acid according to the volume ratio of 1:3:1. The composition of the pre-acid and the post-acid is the same, namely 10 percent of hydrochloric acid, 0.8 to 1.5 percent of clay stabilizer, 0.2 to 1.0 percent of iron ion stabilizer, 0.25 to 1.0 percent of corrosion inhibitor, 0.4 to 1.0 percent of water unlocking agent, 0.2 to 1.0 percent of mutual solvent and the balance of water; the main acid consists of the following components in percentage by mass: 6% of acetic acid, 2% of fluoboric acid, 0.8-1.5% of clay stabilizer, 0.2-1.0% of iron ion stabilizer, 0.25-1.0% of corrosion inhibitor, 0.4-1.0% of water unlocking agent, 0.2-1.0% of mutual solvent and the balance of water. The plugging removing agent has good plugging removing effect on inorganic scale, has poor plugging removing effect on organic scale, has various preparation raw materials, high cost and complex preparation process, and increases construction difficulty.
Disclosure of Invention
In view of the above, the invention provides an emulsion type acidolysis blocking remover and a preparation method thereof. The emulsion type acid blocking remover provided by the invention can simultaneously erode organic scale and inorganic scale and has good blocking removing effect.
In order to achieve the above object, the present invention provides the following technical solutions:
an emulsion type acidolysis blocking remover consists of a continuous phase and a disperse phase;
the continuous phase consists of an organic acid, water and a surfactant;
the disperse phase consists of an asphalt dispersing agent and an oil phase;
the mass percentage of the organic acid in the continuous phase is 5-20%, and the mass percentage of the surfactant in the continuous phase is 0.1-1%;
the mass percentage of the asphaltene dispersant in the disperse phase is 0.5-5%;
the mass ratio of the disperse phase to the continuous phase is 1:9-5:5.
Preferably, the organic acid comprises one or more of methanesulfonic acid, citric acid, and acetic acid; the surfactant comprises a surfactant obtained by combining polyether amine and a sulfonate-containing substance in an electrostatic effect.
Preferably, the asphaltene dispersant comprises one or both of dodecylbenzene sulfonic acid and p-dodecylphenol.
Preferably, the oil phase comprises one or more of white oil, kerosene, diesel oil, toluene and xylene.
Preferably, the water comprises tertiary water or formation water, the formation water having a mineralization of <5700 ppm.
The invention provides a preparation method of the blocking remover, which comprises the following steps:
firstly mixing an organic acid aqueous solution and a surfactant to obtain a continuous phase;
secondly mixing the asphalt dispersing agent and the oil phase to obtain a dispersed phase;
and mixing the continuous phase and the disperse phase, and emulsifying to obtain the blocking remover.
Preferably, the emulsification is ultrasonic emulsification, the power of ultrasonic emulsification is 400-600W, the times are 10-30 times, and the duration of single ultrasonic emulsification is 3-7 s.
Preferably, the first mixing mode is stirring, the rotating speed of stirring is 300-800 r/min, and the time is 30-60 min.
Preferably, the second mixing mode is stirring, the rotating speed of stirring is 300-500 r/min, and the time is 30-60 min.
The invention provides an emulsion type acidolysis blocking remover, which consists of a continuous phase and a disperse phase; the continuous phase consists of an organic acid, water and a surfactant; the disperse phase consists of an asphalt dispersing agent and an oil phase; the mass percentage of the organic acid in the continuous phase is 5-20%, and the mass percentage of the surfactant in the continuous phase is 0.1-1%; the mass percentage of the asphaltene dispersant in the disperse phase is 0.5-5%; the mass ratio of the disperse phase to the continuous phase is 1:9-5:5. The organic acid in the emulsion type acidizing and plugging removing agent prepared by the invention is a continuous phase component, and the emulsion type acidizing and plugging removing agent can be injected into the ground to remove inorganic scales such as calcium carbonate and the like; the asphalt dispersing agent is encapsulated in emulsion oil drops and controllably released when injected into an underground reservoir, and acts on organic scales such as asphalt sediment and the like in cooperation with oil phase substances, so that the blocking remover provided by the invention can simultaneously erode inorganic scales and organic scales, has remarkable blocking removing effect, and does not need to apply corresponding blocking remover for the inorganic scales and the organic scales twice respectively, thereby reducing construction times, effectively shortening construction time and reducing cost. In addition, the plugging remover prepared by the method has small corrosiveness to equipment because the preparation raw materials do not contain inorganic acid, and can effectively improve the recovery ratio.
The invention also provides a preparation method of the blocking remover. The preparation method provided by the invention has simple process and is convenient to operate.
Drawings
FIG. 1 is a flow chart of an embodiment of the present invention for preparing a blocking remover;
FIG. 2 is an external view of a simulated scale mixture prepared in example 1 of the present invention;
FIG. 3 is an appearance diagram of the blocking remover prepared in example 1 of the present invention;
FIG. 4 is a graph showing the effect of the plugging removing agent prepared in example 1 of the present invention after 12 hours of corrosion on the simulated scale mixture.
Detailed Description
The invention provides an emulsion type acidolysis blocking remover, which consists of a continuous phase and a disperse phase; the continuous phase consists of an organic acid, water and a surfactant; the disperse phase consists of an asphalt dispersing agent and an oil phase; the mass percentage of the organic acid in the continuous phase is 5-20%, and the mass percentage of the surfactant in the continuous phase is 0.1-1%; the mass percentage of the asphaltene dispersant in the disperse phase is 0.5-5%; the mass ratio of the disperse phase to the continuous phase is 1:9-5:5.
The preparation raw materials used in the invention are all commercially available unless otherwise specified.
In the present invention, the continuous phase is composed of an organic acid, water and a surfactant. In the present invention, the mass percentage of the organic acid in the continuous phase is 5 to 20%, preferably 7 to 15%, more preferably 8 to 12%, still more preferably 9 to 11%, and in the present invention, the organic acid preferably includes one or more of methanesulfonic acid, citric acid and acetic acid, more preferably one or both of methanesulfonic acid and citric acid, still more preferably methanesulfonic acid. In the present invention, the mass percentage of the surfactant in the continuous phase is 0.1 to 1%, preferably 0.5 to 1%, more preferably 0.5 to 0.8%, and still more preferably 0.6%. In the present invention, the surfactant preferably includes a surfactant obtained by combining polyetheramine and a sulfonate-containing substance with electrostatic action, more preferably a D-SA surfactant disclosed in patent CN 111889025A, and the preparation method of the D-SA surfactant preferably includes: polyether amine D230 and 4-dodecyl sulfonic acid are mixed according to the weight ratio of 1:2.5, and magnetically stirred for 10 minutes at 30 ℃ to prepare the catalyst. In the invention, the D-SA surfactant is a super-amphiphilic molecular emulsifier, can improve the acid resistance and salt resistance of the blocking remover, can still play a role in stratum with severe conditions such as high salt, strong acid and the like, has high activity, and can form stable acid emulsion as an emulsifier under the condition of small addition. In the present invention, the water preferably comprises tertiary water or formation water, the formation water preferably having a mineralization of <5700 ppm. In the present invention, the tertiary water is preferably deionized water produced by an ultrapure water machine at a resistivity of 18.25mΩ·cm. In the invention, the continuous phase takes organic acid as an acidic substance, and is injected into the ground to act on inorganic scale such as calcium carbonate and the like, and the continuous phase does not contain inorganic acid, so that the corrosion to recovery equipment is small, and the purpose of effectively improving the recovery ratio can be achieved.
In the present invention, the mass percentage of the asphaltene dispersant in the dispersed phase is 0.5 to 5%, preferably 0.8 to 4%, more preferably 0.9 to 3%, still more preferably 1 to 2%. In the present invention, the asphaltene dispersant preferably includes one or both of dodecylbenzene sulfonic acid (DBSA) and p-Dodecylphenol (DP), more preferably dodecylbenzene sulfonic acid.
In the present invention, the oil phase preferably includes one or more of white oil, kerosene, diesel oil, toluene and xylene, more preferably one or more of white oil, toluene and xylene, further preferably toluene or xylene, and most preferably xylene.
According to the invention, the asphaltene dispersing agent and the oil phase form a disperse phase, so that the asphaltene dispersing agent is encapsulated in emulsion oil drops in the blocking remover, the asphaltene dispersing agent encapsulated in the oil drops is not released at normal temperature, and is gradually released along with the rise of the temperature of the stratum after being injected into the stratum, so that the controllable release of the asphaltene dispersing agent is realized when the asphaltene dispersing agent is injected into an underground reservoir. Meanwhile, the oil phase substance preferred by the invention can dissolve a part of deposited asphaltene, can act on organic scales such as asphaltene deposition and the like together with an asphaltene dispersing agent, and achieves the effect of dissolving the organic scales, thereby dredging a blocked well hole and improving the recovery ratio.
In the present invention, the mass ratio of the dispersed phase to the continuous phase is 1:9 to 5:5, preferably 2:8 to 5:5, and more preferably 4:6 to 5:5. In a specific embodiment of the invention, the mass ratio of the dispersed phase to the continuous phase is preferably 1:9, 2:8, 3:7, 4:6 or 5:5.
The invention also provides a preparation method of the blocking remover, which comprises the following steps: firstly mixing an organic acid aqueous solution and a surfactant to obtain a continuous phase; secondly mixing the asphalt dispersing agent and the oil phase to obtain a dispersed phase; and mixing the continuous phase and the disperse phase, and emulsifying to obtain the blocking remover.
The invention carries out first mixing on the organic acid aqueous solution and the surfactant to obtain a continuous phase. In the present invention, the first mixing means is preferably stirring, the rotation speed of the stirring is preferably 300 to 800r/min, more preferably 400 to 600r/min, still more preferably 500 to 550r/min, and the stirring time is preferably 30 to 60min, more preferably 40 to 55min, still more preferably 45 to 50min. The invention preferably prepares the organic acid and water into an organic acid solution, and then carries out first mixing with the surfactant, thereby being beneficial to preventing the surfactant from being deactivated under the high-concentration acidic condition.
The invention carries out secondary mixing on the asphalt dispersing agent and the oil phase to obtain a dispersed phase. In the present invention, the second mixing means is preferably stirring, the rotation speed of the stirring is preferably 300 to 500r/min, more preferably 350 to 500r/min, still more preferably 450 to 500r/min, and the stirring time is preferably 30 to 60min, more preferably 30 to 50min, still more preferably 30 to 40min.
After the continuous phase and the oil phase are obtained, the invention preferably mixes and emulsifies the continuous phase and the disperse phase in sequence to obtain the blocking remover.
In the present invention, the means of emulsification is preferably ultrasonic emulsification, the ultrasonic emulsification is preferably performed at room temperature, and the power of ultrasonic emulsification is preferably 400 to 600W, more preferably 400 to 550W, and further preferably 400 to 450W. In the invention, the ultrasonic emulsification is preferably carried out after a period of ultrasonic treatment, and ultrasonic treatment is carried out after a period of time, and the ultrasonic emulsification is carried out until the ultrasonic emulsification is carried out according to the ultrasonic frequency. The number of times of the ultrasonic emulsification is preferably 10 to 30 times, more preferably 15 to 28 times, further preferably 20 to 25 times, more preferably 20 times. The duration of the single ultrasonic emulsification is preferably 3 to 7 seconds, more preferably 4 to 6 seconds, further preferably 5 seconds, and the batch time after the single ultrasonic emulsification is preferably 3 to 7 seconds, more preferably 4 to 6 seconds, further preferably 5 seconds.
The technical solutions of the present invention will be clearly and completely described in the following in connection with the embodiments of the present invention.
FIG. 1 is a flow chart of the preparation of the blocking remover according to the embodiment of the invention, wherein a continuous phase is prepared by stirring and dissolving a surfactant D-SA and an organic acid solution (namely the organic acid solution in the invention), a dispersed phase is obtained by stirring and dissolving asphalt dispersoids and an oil phase, and then an emulsion-type acidification blocking remover is obtained by ultrasonic emulsification of the continuous phase and the oil phase.
Example 1
Preparation of simulated mixed scale: asphaltenes, calcium carbonate and toluene solutions were mixed at a ratio of 1:5:5, aging at 150 ℃ for 10 hours, and drying the solvent to prepare the simulated mixed scale used in the embodiment and the subsequent embodiments. FIG. 2 is a view showing the appearance of the simulated scale mixture prepared in example 1 according to the present invention, and it can be seen from FIG. 2 that the appearance of the simulated scale mixture prepared is mostly a lump-shaped cement.
0.3wt% (based on the total mass of the blocking remover) of D-SA was dissolved in a 10wt% concentration solution of methanesulfonic acid, the water used for the methanesulfonic acid solution was three times water. Stirring at 500r/min for 30min to prepare a continuous phase; 1wt% (accounting for the total mass of the disperse phase) of DBSA is dissolved in dimethylbenzene and stirred at the speed of 500r/min for 30min to prepare the disperse phase; mixing the dispersed phase and the continuous phase according to the mass ratio of 5:5, carrying out ultrasonic treatment for 20 times, wherein the ultrasonic power is 400W, each time of ultrasonic treatment is 5s, and carrying out ultrasonic emulsification to obtain the emulsion type acidification blocking remover.
Fig. 3 is an appearance diagram of the blocking remover prepared in example 1, and as can be seen from fig. 3, the blocking remover prepared in example is a uniform emulsion after being placed for 12 hours, has no demulsification and delamination phenomena, and shows good stability.
1g of the simulated scale mixture was weighed and immersed in 10mL of the plugging remover prepared in example 1 at 50 ℃. And taking out soaked mixed scales respectively when soaking for 1, 4, 8, 12 and 24 hours, filtering, washing, drying and weighing, subtracting the mass of the residual mixed scales when weighing each time from the original mass of the mixed scales to obtain a mass difference, and calculating the percentage of the mass difference to the original mass of the mixed scales to obtain the corrosion rate each time. Fig. 4 is a graph showing the effect of the plugging agent prepared in example 1 after 12 hours of corrosion on the simulated mixed scale, and as can be seen from fig. 4, after the simulated mixed scale is corroded, only a part of small particles exist at the bottom of the plugging agent, and the corroded part is dissolved in the middle and upper parts of the plugging agent, so that the plugging agent has an obvious corrosion effect on the simulated mixed scale.
The corrosion rate results of the plugging removing agent prepared in example 1 on mixed scales at 1, 4, 8, 12 and 24 hours are shown in table 1.
TABLE 1 erosion Rate of the blocking remover prepared in example 1 on the mixed scale at 1, 4, 8, 12 and 24 hours
As can be seen from Table 1, the dissolution rate of the plugging removing agent prepared in example 1 for the mixed scale gradually increases with the increase of the soaking time, and the dissolution rate can reach 85.08% after soaking for 24 hours.
Example 2
0.3wt% (based on the total mass of the blocking remover) of D-SA was dissolved in a 10wt% concentration solution of methanesulfonic acid, the water used for the methanesulfonic acid solution was three times water. Stirring at 500r/min for 30min to prepare a continuous phase; 1wt% (accounting for the total mass of the disperse phase) of DBSA is dissolved in white oil and stirred at the speed of 500r/min for 30min to prepare the disperse phase; mixing the dispersed phase and the continuous phase according to the mass ratio of 5:5, carrying out ultrasonic treatment for 20 times, wherein the ultrasonic power is 400W, each time of ultrasonic treatment is 5s, and carrying out ultrasonic emulsification to obtain the emulsion type acidification blocking remover. 1g of the simulated mixed scale prepared in example 1 was weighed and soaked in 10mL of the plugging removing agent prepared in example 2 at 50 ℃. The erosion rates of the blocking remover on the mixed scale at 1, 4, 8, 12 and 24 hours were calculated respectively, and the calculation method of the erosion rates was the same as that of example 1. The corrosion rate results of the plugging removing agent prepared in example 2 on the mixed scale at 1, 4, 8, 12 and 24 hours are shown in table 2.
TABLE 2 erosion Rate of the blocking remover prepared in example 2 on the mixed scale at 1, 4, 8, 12 and 24 hours
| Soaking time (h) | 1 | 4 | 8 | 12 | 24 |
| Corrosion Rate (%) | 8.92 | 12.32 | 22.23 | 25.78 | 26.24 |
As can be seen from Table 2, the dissolution rate of the plugging removing agent prepared in example 2 for the mixed scale gradually increases with the increase of the soaking time, and the dissolution rate can reach 26.24% after soaking for 24 hours.
Example 3
D-SA in an amount of 0.3wt% (based on the total mass of the plugging removing agent) was dissolved in each of the aqueous solution of methanesulfonic acid, acetic acid and citric acid having a concentration of 10wt%, and the water used for each of the aqueous solution of acid was tertiary water, formation water (mineralization <5700 ppm) and tertiary water, respectively. Stirring at 500r/min for 30min to prepare a continuous phase 1, a continuous phase 2 and a continuous phase 3; 1wt% (accounting for the total mass of the disperse phase) of DBSA is dissolved in white oil and stirred at the speed of 500r/min for 30min to prepare the disperse phase; the mass ratio of the disperse phase to the continuous phase 1, the continuous phase 2 and the continuous phase 3 is 5:5, carrying out ultrasonic treatment for 20 times, wherein the ultrasonic power is 400W, each time of ultrasonic treatment is 5s, and three emulsion type acidolysis blocking remover are prepared through ultrasonic emulsification. 1g of the simulated mixed scale prepared in example 1 is weighed and soaked in the blocking remover prepared in example 3 at 50 ℃ respectively, and the dosage of each blocking remover is 10mL. The erosion rate of each plugging removing agent for the mixed scale at 24 hours was calculated, and the erosion rate was calculated in the same manner as in example 1. The corrosion rate of the plugging removing agent prepared in example 3 on the mixed scale at 24 hours is shown in Table 3.
TABLE 3 erosion Rate of the plugging removing agent prepared in example 3 against the mixed scale at 24 hours
| Organic acid | Acetic acid | Citric acid | Methanesulfonic acid |
| Corrosion Rate (%) | 14.92 | 20.67 | 26.24 |
As can be seen from Table 3, three different organic acids can be used to achieve good corrosion effects on the mixed scale, wherein the corrosion effects of the plugging remover prepared by taking methanesulfonic acid as the organic acid are the best.
Example 4
Dissolving 0.3wt% (accounting for the total mass of the blocking remover) of D-SA in 10wt% concentration solution of methanesulfonic acid, wherein water used in the methanesulfonic acid solution is three times of water, and stirring at a speed of 500r/min for 30min to prepare a continuous phase; 1wt% (accounting for the total mass of the disperse phase) of DBSA is dissolved in dimethylbenzene and stirred at the speed of 500r/min for 30min to prepare the disperse phase; mixing the disperse phase and the continuous phase according to the mass ratio of 1:9, 2:8, 3:7, 4:6 and 5:5 respectively, and performing ultrasonic emulsification under the following conditions: ultrasonic treatment is carried out for 20 times, the ultrasonic power is 400W, each ultrasonic treatment is carried out for 5s, and the intermittent ultrasonic treatment is carried out for 5s, so that five emulsion type acidizing blocking remover is finally prepared. 1g of the simulated mixed scale prepared in example 1 is weighed and soaked in the blocking remover prepared in example 4 at 50 ℃ respectively, and the dosage of each blocking remover is 10mL. The erosion rate of each plugging removing agent for the mixed scale at 24 hours was calculated, and the erosion rate was calculated in the same manner as in example 1. The corrosion rate of the plugging removing agent prepared in example 4 on the mixed scale at 24 hours is shown in table 4.
TABLE 4 erosion Rate of Mixed Scale at 24h for the blocking remover prepared in example 4
As can be seen from Table 4, the plugging removing agent prepared in example 4 has better erosion rate for mixed scale under the condition of different mass ratios of the disperse phase and the continuous phase, and the erosion rate for mixed scale increases along with the increase of the mass ratio of the disperse phase.
Example 5
Dissolving 0.3wt% (accounting for the total mass of the blocking remover) of D-SA in 10wt% concentration solution of methanesulfonic acid, wherein water used in the methanesulfonic acid solution is three times of water, and stirring at a speed of 500r/min for 30min to prepare a continuous phase; 1wt% (accounting for the total mass of the disperse phase) of DBSA is dissolved in dimethylbenzene and stirred at the speed of 500r/min for 30min to prepare a disperse phase 1; 1wt% (based on the total mass of the dispersed phase) DP was dissolved in xylene and stirred at a rate of 500r/min for 30min to prepare dispersed phase 2.
Mixing the disperse phase 1 and the disperse phase 2 with the continuous phase according to the mass ratio of 5:5, and performing ultrasonic emulsification under the following conditions: ultrasonic treatment is carried out for 20 times, the ultrasonic power is 400W, each ultrasonic treatment is carried out for 5 seconds, and the intermittent ultrasonic treatment is carried out for 5 seconds, so that two emulsion type acidolysis blocking remover are finally prepared. 1g of the simulated mixed scale prepared in example 1 is weighed and soaked in the blocking remover prepared in example 5 at 50 ℃ respectively, and the dosage of each blocking remover is 10mL. The erosion rate of each plugging removing agent for the mixed scale at 24 hours was calculated, and the erosion rate was calculated in the same manner as in example 1. The corrosion rate of the plugging removing agent prepared in example 5 on the mixed scale at 24 hours is shown in Table 5.
TABLE 5 erosion Rate of the plugging removing agent prepared in example 5 to the mixed scale at 24 hours
| Asphaltene dispersants | DP | DBSA |
| Corrosion Rate (%) | 82.27 | 85.08 |
As can be seen from Table 5, the blocking remover prepared in example 5 adopts DBSA and DP to prepare disperse phase with xylene, and can achieve higher corrosion rate on mixed scale and better blocking removing effect.
The foregoing is merely a preferred embodiment of the present invention and it should be noted that modifications and adaptations to those skilled in the art may be made without departing from the principles of the present invention, which are intended to be comprehended within the scope of the present invention.
Claims (6)
1. An emulsion type acidolysis blocking remover is characterized by comprising a continuous phase and a disperse phase;
the continuous phase consists of an organic acid, water and a surfactant;
the disperse phase consists of an asphaltene dispersing agent and an oil phase;
the mass percentage of the organic acid in the continuous phase is 9-11%, and the mass percentage of the surfactant in the continuous phase is 0.1-1%;
the mass percentage of the asphaltene dispersing agent in the disperse phase is 0.5-5%;
the mass ratio of the disperse phase to the continuous phase is 1:9-5:5;
the organic acid is methyl sulfonic acid; the surfactant is obtained by combining polyether amine and a substance containing sulfonate under the action of static electricity;
the asphaltene dispersant comprises one or two of dodecylbenzene sulfonic acid and p-dodecylphenol;
the oil phase is xylene.
2. The plugging remover of claim 1, wherein the water comprises tertiary water or formation water, the formation water having a mineralization of less than 5700ppm.
3. The method for preparing the blocking remover according to any one of claims 1-2, which is characterized by comprising the following steps:
firstly mixing an organic acid aqueous solution and a surfactant to obtain a continuous phase;
secondly mixing an asphaltene dispersing agent and an oil phase to obtain a dispersed phase;
and mixing the continuous phase and the disperse phase, and emulsifying to obtain the blocking remover.
4. The method according to claim 3, wherein the emulsification is ultrasonic emulsification, the power of ultrasonic emulsification is 400-600 w, the number of times is 10-30, and the duration of single ultrasonic emulsification is 3-7 s.
5. The method according to claim 3, wherein the first mixing is performed by stirring at a rotation speed of 300-800 r/min for 30-60 min.
6. The method according to claim 3, wherein the second mixing is performed by stirring at a rotation speed of 300-500 r/min for 30-60 min.
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