CN111995995B - Bulk-expanded particle heterogeneous crack plugging effect improving agent and preparation method thereof - Google Patents
Bulk-expanded particle heterogeneous crack plugging effect improving agent and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a bulk-expanded particle heterogeneous crack plugging effect improver and a preparation method thereof, wherein the bulk-expanded particle heterogeneous crack plugging effect improver comprises the following components in percentage by mass: 79-94.9% of coupling agent modified matrix particles, 5-20% of laminating resin and 0.1-1% of lubricant; the preparation method comprises the following steps: step 1: preparing coupling agent modified matrix particles; step 2: grinding the film-coated resin into powder and respectively preheating the powder and the coupling agent modified matrix particles obtained in the step (1); and step 3: uniformly mixing the lubricant, the coated resin obtained in the step 2 and the coupling agent modified matrix particles, and heating at 120-180 ℃; taking out the mixture every t time in the heating process, stirring uniformly, continuing to heat, and obtaining the needed improver after 0.5-1 h; the improver is convenient to use, ingenious in action mechanism and free of any other matched agent, and the blocking effect of the heterogeneous cracks of the expanded particles can be improved only by utilizing the flushing effect of the high temperature of the stratum and the produced water.
Description
Technical Field
The invention relates to the technical field of oil exploitation, in particular to an agent for improving the plugging effect of bulk-expanded particle heterogeneous cracks and a preparation method thereof.
Background
The reserves of the fractured reservoirs account for more than 50 percent of the reserves of the oil which is proved to be worldwide, and are important sources of energy supply. However, a fractured reservoir usually has strong heterogeneity, and a wide fracture is used as a main force channel for oil-water flow, so that a shielding effect is easily generated on a narrow fracture and oil-water flow in a matrix. The oil reservoir water injection wave is small in volume, obvious in water channeling and low in crude oil recovery rate. Therefore, the chemical plugging agent is used for improving the flow resistance in the wide fractures, so that the utilization degree of the narrow fractures and the matrix is enhanced, and the chemical plugging agent becomes a powerful measure for controlling water, increasing oil, improving quality and increasing efficiency of the fractured oil reservoir.
For example, in the study on the formula optimization and selective water plugging mechanism of the dual-crosslinked gel-type plugging agent, prunus dulcis reports that heterogeneous crack water plugging is carried out by using hyperbranched polyacrylamide and organic chromium as a ground primary crosslinking system and using cationic polyacrylamide and phenolic resin as a multiple crosslinked gel of an underground secondary crosslinking gel system. Patent document CN110628399 discloses a crack sealing agent composed of a first reactive polymer, a polymerized monomer, a crosslinking agent, an initiator, non-soluble solid particles and a polymer solution. The crack plugging agents have respective plugging advantages, but final colloid needs to be formed underground, so that the problems of colloid forming environment, uncontrollable colloid forming performance, limited salt resistance and salt tolerance of the colloid and the like are caused, and the risk of crack plugging failure is increased. The ground colloid-forming bulked particles can be prepared by using an optimal system formula under an optimal colloid-forming environment, and the strength, the particle size, the expansion times and the like of the ground colloid-forming bulked particles can be artificially regulated and controlled. Meanwhile, the bulk expanded particles enter the stratum in a three-dimensional network structure, and compared with an underground gel-forming system which enters the stratum in a linear structure, the temperature resistance and salt resistance of the underground gel-forming system are obviously improved. Therefore, in recent years, the bulked particles are widely applied to water control of cracks.
After the bulk expanded particles enter the water outlet wide crack, the bulk expanded particles absorb water to expand and fill the crack under the oil reservoir condition, so that the flow space in the wide crack can be effectively reduced, and the flow resistance of the wide crack is increased. However, the expanded particles have weak force with the fracture wall surface and can enter the fracture smaller than the size of the expanded particles by deformation. Therefore, when the size, the flow splitting rate and the like of the bulked particles are not matched with the properties of the cracks, the bulked particles are easy to break through from wide cracks in the water plugging process, and even the difference of flow resistance in the wide cracks and the narrow cracks can be enlarged, so that the heterogeneity of the fracture fluid is aggravated. Therefore, the retention capacity of the expanded particles in the wide fractures is improved, the dependence of the fracture plugging effect on the particle size and the flow splitting rate is reduced, and the method has positive significance for widening the application range of the expanded particles and improving the water control effect of the fractured oil reservoir.
Disclosure of Invention
The invention provides an improving agent capable of greatly improving the heterogeneous crack plugging effect of bulk-expanded particles and a preparation method thereof, aiming at the problems of the existing bulk-expanded particles in the crack plugging water.
The technical scheme adopted by the invention is as follows:
an agent for improving the plugging effect of a bulk-expanded particle heterogeneous crack comprises the following components in percentage by mass: 79-94.9% of coupling agent modified matrix particles, 5-20% of film-coated resin and 0.1-1% of lubricant.
Further, the matrix particles are one or a mixture of more than two of quartz sand, glass sand, volcanic stone balls, medical stone balls, ceramic particles, walnut shell particles and almond shell particles in any proportion.
The coating resin is one or a mixture of two or more of phenolic resin, tung oil modified phenolic resin, terpene phenolic resin, solid epoxy resin and bismaleimide resin in any proportion.
Furthermore, the coupling agent is one or a mixture of more than two of gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, methyltrimethoxysilane and N-beta- (aminoethyl) -gamma-aminopropylmethyldimethoxysilane in any proportion.
Further, the lubricant is a mixture of one or two of calcium stearate and paraffin.
A preparation method of an agent for improving the plugging effect of a bulk-expanded particle heterogeneous crack comprises the following steps:
step 1: preparing coupling agent modified matrix particles;
step 2: grinding the film-coated resin into powder and preheating, and simultaneously preheating the coupling agent modified matrix particles obtained in the step 1;
and step 3: uniformly mixing the lubricant, the coated resin obtained in the step 2 and the coupling agent modified matrix particles, and heating at 120-180 ℃; and taking out the mixture every t time in the heating process, stirring uniformly, and then continuing heating for 0.5-1 h to obtain the required modifier.
Further, the preparation process of the coupling agent modified matrix particles in the step 1 is as follows:
s11: uniformly mixing a coupling agent, water and alcohol under the condition that the pH value is 4-9, and reacting for 1-2 hours to obtain coupling agent hydrolysate;
s12: mixing and reacting the matrix particles and the coupling agent hydrolysate for 2 hours according to the mass ratio of 100: 30-50;
s13: and filtering the obtained particles, and drying to obtain the needed coupling agent modified matrix particles.
Further, in the step 2, the film-coated resin is preheated for 10min at 40 ℃, and the coupling agent modified matrix particles are preheated for 10min at 80-130 ℃.
Further, the alcohol is one of methanol and ethanol or a mixture thereof.
Furthermore, the coupling agent hydrolysate comprises 5-15% of coupling agent, 5-90% of water and 5-90% of alcohol according to the volume percentage of each component.
The invention has the beneficial effects that:
(1) the invention is a salt-resistant and salt-resistant high-strength coating hard particle with heat sensitivity, and the surface of the improver is stable by a thermoplastic resin film formed by coating resin at low ground temperature and can be dispersed in water for injection; after entering the stratum, the improver is accumulated in the crack, and the thermoplastic resin film on the surface of the improver is softened at the high temperature (80-150 ℃) of the stratum, so that the improver particles are adhered to the wall surface of the crack, and the strong action is realized; the improver can modify the fracture into a porous medium with remarkably reduced flowing ability by utilizing the high temperature of the oil reservoir and the natural accumulation of the improver without any auxiliary agent;
(2) in the invention, during water plugging operation, the improver is injected after the swelling particles are swelled, and can selectively enter the effluent wide crack; after the oil well is produced, the expanded particles in the wide fracture are reversely blocked among the improving agent particles under the flushing of formation water, the breakthrough pressure gradient is obviously improved and is larger than that of the expanded particles in the narrow fracture, and thus the fracture fluid production profile can be reversed; the plugging behavior characteristics of the improver and the expanded particles in the cracks are ingeniously combined, and the plugging effect of the heterogeneous cracks of the expanded particles is effectively improved by producing water for scouring.
Drawings
FIG. 1 is a diagram of an experimental apparatus for the effect of the improving agent on the plugging effect of bulk-expanded particle heterogeneous fractures in the embodiment of the present invention.
Fig. 2 is a schematic diagram of the plugging effect of bulk-expanded particles on a heterogeneous fracture in the embodiment of the present invention, where a is a heterogeneous fracture core group after the bulk-expanded particles act on the heterogeneous fracture, and b is bulk-expanded particles that break through from a wide fracture.
Fig. 3 shows a heterogeneous core group after combined action of bulk-swelling particles and an improver in a test of influence of the improver on blocking effect of bulk-swelling particle heterogeneous cracks in an embodiment of the invention.
In the figure: 1-advection pump, 2-first six-way valve, 3-first pressure gauge, 4-first core holder, 5-second core holder, 6-first measuring cylinder, 7-second measuring cylinder, 8-second six-way valve, 9-second pressure gauge and 10-manual pump.
Detailed Description
The invention is further illustrated by the following specific examples and the accompanying drawings.
An agent for improving the plugging effect of a bulk-expanded particle heterogeneous crack comprises the following components in percentage by mass: 79-94.9% of coupling agent modified matrix particles, 5-20% of film-coated resin and 0.1-1% of lubricant. The coupling agent modified matrix particles are obtained by hydrolysis reaction of the matrix particles and the coupling agent. The coupling agent hydrolysate is composed of coupling agent, water and alcohol.
The matrix particles are one or a mixture of more than two of quartz sand, glass sand, volcanic stone balls, medical stone balls, ceramic particles, walnut shell particles and almond shell particles in any proportion. The coating resin is one or a mixture of more than two of phenolic resin, tung oil modified phenolic resin, terpene phenolic resin, solid epoxy resin and bismaleimide resin in any proportion. The coupling agent is one or a mixture of more than two of gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, methyltrimethoxysilane and N-beta- (aminoethyl) -gamma-aminopropylmethyldimethoxysilane in any proportion. The lubricant is one or a mixture of two of calcium stearate and paraffin.
A preparation method of an agent for improving the plugging effect of a bulk-expanded particle heterogeneous crack comprises the following steps:
step 1: preparing coupling agent modified matrix particles;
step 2: grinding the film-coated resin into powder and preheating, and simultaneously preheating the coupling agent modified matrix particles obtained in the step 1;
and step 3: uniformly mixing the lubricant, the coated resin obtained in the step 2 and the coupling agent modified matrix particles, and heating at 120-180 ℃; and taking out the mixture every t time in the heating process, stirring uniformly, and then continuing heating for 0.5-1 h to obtain the required modifier.
The preparation process of the coupling agent modified matrix particles in the step 1 is as follows:
s11: uniformly mixing a coupling agent, water and alcohol under the condition that the pH value is 4-9, and reacting for 1-2 hours to obtain coupling agent hydrolysate;
s12: mixing and reacting the matrix particles and the coupling agent hydrolysate for 2 hours according to the mass ratio of 100: 30-50;
s13: and filtering the obtained particles, and drying to obtain the needed coupling agent modified matrix particles.
In the step 2, the coated resin is preheated for 10min at 40 ℃, and the coupling agent modified matrix particles are preheated for 10min at 80-130 ℃.
The alcohol is one or mixture of methanol and ethanol.
The coupling agent hydrolysate comprises 5-15% of coupling agent, 5-90% of water and 5-90% of alcohol according to the volume percentage of each component.
Example 1
Preparing an agent for improving the blocking effect of the bulk-expanded particle heterogeneous crack according to the following steps;
step 1: uniformly mixing 6mL of gamma-aminopropyltriethoxysilane, 4mL of water and 40mL of ethanol at room temperature under the condition that the pH value is 9.0, and reacting for 2h to obtain coupling agent hydrolysate; mixing 50g of volcanic rock balls with the average grain diameter of 1mm and 25g of coupling agent hydrolysate at room temperature and reacting for 2 hours; and then filtering the volcanic stone balls, and drying the volcanic stone balls in a 60 ℃ drying oven for 5 hours to obtain the coupling agent modified matrix particles.
Step 2: 15g of terpene phenolic resin was ground to a powder and preheated at 40 ℃ for 10min, while 84.6g of coupling agent modified matrix particles were preheated at 130 ℃ for 10 min.
And step 3: uniformly mixing preheated terpene phenolic resin powder, coupling agent modified matrix particles and 0.4g of calcium stearate, and placing the mixture in a constant-temperature oven at 170 ℃ for heating; taking out the mixture from the thermostat every 10min, uniformly stirring and putting the mixture into the thermostat again, and obtaining the improver required by the invention within 1 h.
The effect of the improving agent obtained in this example on the plugging effect of bulk-expanded particle heterogeneous cracks was tested under the following experimental conditions.
The experimental conditions were as follows:
the experiment is carried out at a temperature of 130 ℃ and a degree of mineralization of 19.8 multiplied by 104mg/L. The experimental core is a carbonate outcrop core (phi 3.8 multiplied by 8cm), the core is split along the axis, a groove is etched on one half of the core, and then the rocks at the edge of the groove are bonded by AB glue, so that a crack with a certain seam width is formed.
The experimental procedure was as follows:
step 1: heterogeneous fracture core groups with the respective seam widths of 1mm and 4mm are respectively loaded into a first core holder 4 and a second core holder 5 and connected according to the device shown in fig. 1.
Step 2: and injecting water into the core from the inlet end of the core at the speed of 2mL/min, and measuring the relative fluid production amount before plugging of the two cores after the fluid production at the outlet end of the core is stable.
And step 3: respectively injecting 0.7mm bulk swelling particle solution with 1FV concentration of 16% into the two cores from the inlet ends of the cores according to the relative fluid production amount before water plugging. Then, the first core holder 4 and the second core holder 5 are closed and taken out from the experimental device to be placed vertically (outlet end is downward), and after the expanded particles absorb water and expand for 40 hours, the first core holder 4 and the second core holder 5 are connected into the experimental device again.
And 4, step 4: injecting water into the rock core from the inlet end of the rock core at the speed of 2mL/min, recording the pressure change in the water injection process, calculating the breakthrough pressure gradient of the bulk-expanded particles, and measuring the relative fluid production after the two rock cores are blocked after the fluid production at the outlet end of the rock core is stable.
And 5: and taking out two fracture cores from the first core holder 4 and the second core holder 5, cleaning the two fracture cores, and placing an improver with the volume of 20% of the wide fracture volume at the outlet end of the wide fracture core.
Step 6: and (4) putting the two fractured cores into the core holder again in the same direction, repeating the step (3) to the step (4), and measuring the breakthrough pressure gradient and the relative fluid production after plugging of the bulk expanded particles and the modifier.
From the experimental results, it can be seen that the initial relative fluid production ratio of the wide and narrow fractures is 82.8: 17.2. As shown in fig. 2, when only 0.7mm bulk particles are used for treatment, the bulk particles have a large size and weak migration capability in narrow cracks, and the bulk particles can break through a large amount of wide cracks after the pressure gradient reaches 7.63 MPa/m; and results in all fluid volume being produced from the wide fracture thereafter, and in increased heterogeneity of fracture production fluids.
After the improver is injected, as shown in fig. 3, the migration difficulty of the bulk expanded particles in the wide cracks is obviously improved and is greater than that of the bulk expanded particles in the narrow cracks, and further the bulk expanded particles break through from the narrow cracks when the pressure gradient reaches 18.75 MPa/m. Thereafter, the fluid production profile is reversed and the narrow fracture produces 100% fluid. Therefore, the improver can effectively improve the effect of blocking heterogeneous cracks by large-size bulk expanded particles.
Example 2
The bulk-expanded particle heterogeneous crack plugging effect improver is prepared according to the following steps:
step 1: uniformly mixing 5mL of gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, 40mL of water and 5mL of methanol at room temperature under the condition that the pH value is 4.0, and reacting for 2h to obtain coupling agent hydrolysate; mixing 50g of medical stone balls with the average grain diameter of 1mm and 20g of coupling agent hydrolysate at room temperature and reacting for 2 hours; then, the medical stone balls are filtered and then put into a drying oven at 60 ℃ for drying for 5 hours, and the coupling agent modified matrix particles are obtained.
Step 2: 10g of solid epoxy resin was ground to a powder and preheated at 40 ℃ for 10min, while 89.5g of coupling agent modified matrix particles were preheated at 100 ℃ for 10 min.
And step 3: uniformly mixing preheated solid epoxy resin powder, coupling agent modified matrix particles and 0.5g of calcium stearate, and placing the mixture in a constant-temperature oven at 150 ℃ for heating; taking out the mixture from the thermostat every 10min, uniformly stirring and putting the mixture into the thermostat again, and obtaining the improver required by the invention within 0.5 h.
The effect of the improver prepared in this example on the volume-expanded particle breakthrough pressure gradient and the relative fluid production to heterogeneous fractures was tested according to the experimental procedure in example 1.
Wherein the experiment is carried out at 110 ℃, the size of the volume expansion particles is 0.5mm, and the injection amount ratio in the wide crack and the narrow crack is 3: 2; the remaining experimental conditions were the same as those in example 1.
From the experimental results, it can be seen that when only bulk-expanded particles are used for treatment, the difference of seepage resistance of wide and narrow cracks is further enlarged due to the large amount of bulk-expanded particles in the narrow cracks. The bulked particles break through from the wide fractures when the pressure gradient reaches 5.2MPa/m, resulting in the narrow fractures not being able to initiate.
After the improver is injected, the breakthrough resistance of the bulked particles from the wide cracks is obviously increased; when the pressure gradient reaches 7.24MPa/m, the bulked particles break through from the narrow cracks. Thereafter, the narrow fractures are up to 100% relative to fluid production. Therefore, the adverse effect of improper flow rate of the expanded particles on the plugging effect of the heterogeneous cracks can be avoided by using the improving agent.
Example 3
The bulk-expanded particle heterogeneous crack plugging effect improver is prepared according to the following steps:
step 1: at room temperature, uniformly mixing 5mL of gamma-aminopropyltriethoxysilane, 5mL of water and 40mL of ethanol under the condition that the pH value is 9.0, and reacting for 2h to obtain coupling agent hydrolysate; mixing 50g of ceramic particles with the average particle size of 0.5mm and 25g of coupling agent hydrolysate at room temperature and reacting for 2 hours; and then filtering the ceramic particles, and drying the ceramic particles in a drying oven at 60 ℃ for 5 hours to obtain the coupling agent modified matrix particles.
Step 2: 10g of phenolic resin was ground to a powder and preheated at 40 ℃ for 10min, while 89.7g of coupling agent modified matrix particles were preheated at 80 ℃ for 10 min.
And step 3: uniformly mixing preheated phenolic resin powder, coupling agent modified matrix particles and 0.3g of calcium stearate, and placing the mixture in a constant-temperature oven at 120 ℃ for heating; taking out the mixture from the thermostat every 10min, uniformly stirring and putting the mixture into the thermostat again, and obtaining the improver required by the invention within 1 h.
The effect of the improver prepared in this example on the volume-expanded particle breakthrough pressure gradient and the relative fluid production to heterogeneous fractures was tested according to the experimental procedure in example 1.
The experiment was carried out at 90 ℃ and the bulk particle size was 0.3mm, and the rest of the experimental conditions were the same as those in the examples.
From the experimental results, only by adopting the bulk-expanded particle treatment, when the pressure gradient reaches 2.87MPa/m, the bulk-expanded particles break through from the narrow cracks, and the relative liquid production of the narrow cracks can reach 100%. However, the pressure gradient of the body expansion particles which break through from the wide cracks is only 5.97MPa/m, if the water outlet strength of the reservoir is high, the body expansion particles in the wide cracks and the narrow cracks are generated by scouring, and the heterogeneity of the cracks cannot be improved.
After the improver is injected, the pressure gradient of the breakthrough of the bulked particles from the wide crack is as high as 36.53 MPa/m. It can be seen that the retention capacity of the small-sized bulked particles in the fracture is significantly improved with the aid of the improver, and the liquid production profile can be reversed even at high water output intensity.
The invention is a salt-resistant and salt-resistant high-strength coating hard particle with heat sensitivity, and the surface of the improver is stable by a thermoplastic resin film formed by coating resin at low ground temperature and can be dispersed in water for injection; after entering the stratum, the improver is accumulated in the crack, and the thermoplastic resin film on the surface of the improver is softened at the high temperature (80-150 ℃) of the stratum, so that the improver particles are adhered to the wall surface of the crack, and the strong action is realized; the improver can modify the fracture into a porous medium with remarkably reduced flowing ability by utilizing the high temperature of the oil reservoir and the natural accumulation of the improver without any auxiliary agent; during water plugging operation, the improver is injected after the swelling particles, and can selectively enter the effluent wide crack; after the oil well is produced, the expanded particles in the wide fracture are reversely blocked among the improving agent particles under the flushing of formation water, the breakthrough pressure gradient is obviously improved and is larger than that of the expanded particles in the narrow fracture, and thus the fracture fluid production profile can be reversed; the plugging behavior characteristics of the improver and the expanded particles in the cracks are ingeniously combined, and the plugging effect of the heterogeneous cracks of the expanded particles is effectively improved by producing water for scouring.
The improver has the advantages of wide source of main raw materials, low cost, simple preparation process, low energy consumption, wide oil reservoir temperature adaptability and basically no influence of the mineralization degree on the performance. The improver is convenient to use, ingenious in action mechanism, free of any other matching agent, and capable of improving the blocking effect of the heterogeneous cracks of the expanded particles only by utilizing the flushing effect of the high temperature of the stratum and the produced water. The negative influence on crack plugging caused by improper size and flow distribution rate of the expanded particles can be eliminated, the use risk of the expanded particles can be effectively reduced, and the application range of the expanded particles can be widened.
Claims (7)
1. A preparation method of an agent for improving the plugging effect of a bulk-expanded particle heterogeneous crack is characterized by comprising the following steps:
step 1: preparing coupling agent modified matrix particles;
step 2: grinding the film-coated resin into powder and preheating, and simultaneously preheating the coupling agent modified matrix particles obtained in the step 1;
and step 3: uniformly mixing the lubricant, the coated resin obtained in the step 2 and the coupling agent modified matrix particles, and heating at 120-180 ℃; taking out the mixture every t time in the heating process, stirring uniformly, continuing to heat, and obtaining the needed improver after 0.5-1 h;
the preparation process of the coupling agent modified matrix particles in the step 1 is as follows:
s11: uniformly mixing a coupling agent, water and alcohol under the condition that the pH value is 4-9, and reacting for 1-2 hours to obtain coupling agent hydrolysate;
s12: mixing and reacting the matrix particles and the coupling agent hydrolysate for 2 hours according to the mass ratio of 100: 30-50;
s13: filtering the obtained particles, and drying to obtain the needed coupling agent modified matrix particles;
preheating the film-coated resin at 40 ℃ for 10min, and preheating the coupling agent modified matrix particles at 80-130 ℃ for 10 min;
the improver comprises the following components in percentage by mass: 79-94.9% of coupling agent modified matrix particles, 5-20% of laminating resin and 0.1-1% of lubricant;
the breakthrough pressure gradient and the relative fluid yield after plugging of the bulked particles treated by the improver are tested according to the following steps:
step 1: respectively loading heterogeneous fracture core groups with the fracture widths of 1mm and 4mm into a first core holder (4) and a second core holder (5);
step 2: injecting water into the core from the inlet end of the core at the speed of 2mL/min, and measuring the relative fluid production amount before plugging of the two cores after the fluid production at the outlet end of the core is stable;
and step 3: respectively injecting 0.7mm bulk swelling particle solution with 1FV concentration of 16% into the two cores from the inlet ends of the cores according to the relative fluid production amount before water plugging; then closing the first core holder (4) and the second core holder (5) and taking out the first core holder and the second core holder from the experimental device to be placed vertically; after the swelling particles absorb water and swell for 40 hours, the first core holder (4) and the second core holder (5) are connected into the experimental device again;
and 4, step 4: injecting water into the rock core from the inlet end of the rock core at the speed of 2mL/min, recording the pressure change in the water injection process, calculating the breakthrough pressure gradient of the bulk-expanded particles, and measuring the relative fluid production after the two rock cores are blocked after the fluid production at the outlet end of the rock core is stable;
and 5: taking out two fracture cores from the first core holder (4) and the second core holder (5) to clean, and placing an improver with the volume of 20% of the wide fracture volume at the outlet end of the wide fracture core;
step 6: and (4) putting the two fractured cores into the core holder again in the same direction, repeating the step (3) to the step (4), and measuring the breakthrough pressure gradient and the relative fluid production after plugging of the bulk expanded particles and the modifier.
2. The method for preparing the agent for improving the plugging effect of the expanded particle heterogeneous cracks according to claim 1, wherein the base particles are one or a mixture of two or more of quartz sand, glass sand, volcanic stone balls, medical stone balls, ceramic particles, walnut shell particles and almond shell particles in any proportion.
3. The method for preparing an agent for improving plugging effect of expanded particle heterogeneous cracks according to claim 1, wherein the coating resin is one or a mixture of two or more of phenolic resin, tung oil modified phenolic resin, terpene phenolic resin, solid epoxy resin and bismaleimide resin in any proportion.
4. The method for preparing the agent for improving the plugging effect of the expanded heterogeneous particle cracks according to claim 1, wherein the coupling agent is one or a mixture of two or more of gamma-aminopropyltriethoxysilane, gamma- (2, 3-epoxypropoxy) propyltrimethoxysilane, methyltrimethoxysilane and N-beta- (aminoethyl) -gamma-aminopropylmethyldimethoxysilane in any ratio.
5. The method for preparing an agent for improving plugging effect of expanded heterogeneous particle cracks according to claim 1, wherein the lubricant is a mixture of one or two of calcium stearate and paraffin wax.
6. The method for preparing an agent for improving plugging effect of expanded heterogeneous particle cracks according to claim 1, wherein the alcohol is one of methanol and ethanol or a mixture thereof.
7. The preparation method of the expanded particle heterogeneous crack plugging effect improver according to claim 1, wherein the coupling agent hydrolysate comprises 5-15% of the coupling agent, 5-90% of water and 5-90% of alcohol by volume percentage.
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Citations (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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