CN111621272A - Self-cleaning degradable fracturing temporary plugging agent, preparation method and application thereof - Google Patents
Self-cleaning degradable fracturing temporary plugging agent, preparation method and application thereof Download PDFInfo
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- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
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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
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/62—Compositions for forming crevices or fractures
- C09K8/66—Compositions based on water or polar solvents
- C09K8/68—Compositions based on water or polar solvents containing organic compounds
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- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/60—Compositions for stimulating production by acting on the underground formation
- C09K8/84—Compositions based on water or polar solvents
- C09K8/86—Compositions based on water or polar solvents containing organic compounds
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/885—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices, or the like
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
- E21B43/261—Separate steps of (1) cementing, plugging or consolidating and (2) fracturing or attacking the formation
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- C09K2208/00—Aspects relating to compositions of drilling or well treatment fluids
- C09K2208/10—Nanoparticle-containing well treatment fluids
Abstract
A self-cleaning degradable fracturing temporary plugging agent, a preparation method and an application thereof comprise the following components in percentage by mass: 78-90.85% of degradable material, 0.1-1% of chain extender, 1-5% of hydrophilic agent, 0.05-1% of accelerator and 8-15% of nano reinforcing agent. The components are subjected to melting mixing reaction in a mixing roll, and the self-cleaning degradable fracturing temporary plugging agent with different particle sizes can be prepared by extruding, cutting, cooling, granulating and screening. The temporary plugging agent provided by the invention can be softened, deformed and agglomerated at the formation temperatureThe temporary plugging layers are bonded with each other to form a compact temporary plugging layer, and the temporary plugging layer has good self-adaptive capacity for cracks of different shapes and different sizes, and the maximum breakthrough pressure is more than 40 MPa; the application temperature is 80-140 ℃ adjustable by using the difference of the degradation performance and the softening point of different degradation materials, the degradation rate reaches more than 95%, and CO is generated after degradation2And H2And O, no damage is caused to the reservoir and the flow guide section. The preparation method is simple and safe, and has market popularization value.
Description
Technical Field
The invention relates to the technical field of fracturing yield increase of oil and gas fields, in particular to a self-cleaning degradable fracturing temporary plugging agent, a preparation method and application thereof.
Background
Along with the gradual increase of the production degree of each oil field and the further development and use of low permeability reserves, the original artificial fracture production potential of the old well is smaller and smaller. Due to the heterogeneity of the plane and the longitudinal direction of the reservoir, the mobility degrees of different areas and layers are different, and the conventional fracturing technology has great limitation and even can not achieve the oil increasing effect. The method is characterized in that a diversion repeated fracturing technology is usually implemented for the exploitation of the oil reservoir, a temporary plugging agent is added in real time in the hydraulic fracturing process to temporarily plug the formed artificial cracks, the cracks are forced to initiate and expand in other directions, the fracturing modification volume is enlarged, the fracturing effect is improved, and the stable yield increase of the oil field is ensured.
The fracturing temporary plugging agents which are most commonly used at present are water-soluble, acid-soluble and oil-soluble. However, the three temporary plugging agents are required to realize plugging removal by depending on formation fluid, and the problems of difficult dissolution or incomplete plugging removal may exist in some reservoirs, so that the formation is damaged to a certain extent, and the application of the temporary plugging agents is limited. With the development of green chemicals, the degradable temporary plugging agent for fracturing is more and more favored by the characteristics of self-cleaning, environmental friendliness and small formation damage, and is an important direction for the development of the temporary plugging agent in the future. The degradable temporary plugging agent is applicable to oil wells, high-water-content oil wells, low-temperature wells and high-temperature wells; the mineralization degree in the stratum has little influence; the formation damage is small, and the method has important significance on the sustainable exploitation of the reservoir; importantly, intervention operations such as acidification or blockage removal by adding a gel breaker are not needed in the degradation process, so that the cost and the risk of HSE are reduced; in addition, some degradable temporary plugging agent degradation products can also be used as a subsequent treatment agent of the stratum, for example, the polylactic acid temporary plugging agent degradation product is lactic acid which has a certain acidification effect on the stratum. At present, research and application of the self-cleaning degradable temporary plugging agent are important development trends, particularly, the temporary plugging agent is low in stratum damage, is suitable for research and development of temporary plugging agents with different reservoir temperatures, and has important significance for repeated fracturing of old oil reservoirs.
Disclosure of Invention
The invention provides a self-cleaning degradable fracturing temporary plugging agent, which solves the defects in the prior art. The fracturing temporary plugging agent can have good self-adaptive capacity to cracks of different shapes and sizes through softening, deformation and agglomeration; the applicable temperature is 80-150 ℃, the degradation rate is more than 95%, and CO is generated after complete degradation2And H2And O, no damage to the reservoir.
The technical scheme adopted for realizing the above purpose of the invention is as follows:
a self-cleaning degradable fracturing temporary plugging agent is characterized in that: the paint comprises the following components in percentage by mass: 78-90.85% of degradable material, 0.1-1% of chain extender, 1-5% of hydrophilic agent, 0.05-1% of accelerator and 8-15% of nano reinforcing agent.
Preferably: the degradable material is one or a compound of more than two of polylactic acid, polybutylene succinate, polycaprolactone and polyhydroxybutyrate.
Preferably: the chain extender is one or a compound of more than two of hydroquinone dihydroxyethyl ether, resorcinol dihydroxyethyl ether, 1, 4-butanediol, 1, 6-ethanediol and bisphenol A.
Preferably: the hydrophilic agent is one or a compound of more than two of dopamine, polyethylene glycol and chitosan.
Preferably: the accelerant is one or a compound of more than two of ethanolamine, triethanolamine, triisopropanolamine, ethylenediamine, triethylenetetramine and polyethyleneimine.
Preferably: the nano reinforcing agent is one or a compound of more than two of nano calcium carbonate, nano silicon dioxide, nano titanium dioxide and nano barium sulfate, and the particle diameter of the nano reinforcing agent is 10-50 nm.
Preferably: the degradable material is polylactic acid with the weight-average molecular weight of 0.5-15 ten thousand, the softening point of 58-60 ℃ and the melting point of about 180 ℃; the weight average molecular weight of the poly (butylene succinate) is 0.5-10 ten thousand, the softening point is 96-98 ℃, and the melting point is about 114 ℃; the weight average molecular weight of the polycaprolactone is 0.5-12 ten thousand, the softening point is about 55 ℃, and the melting point is about 62 ℃; the weight average molecular weight of the polyhydroxybutyrate is 0.5-15 ten thousand, the softening point is about 147 ℃, and the melting point is about 175 ℃.
The degradable materials with different softening points and melting points are selected mainly to meet the application conditions, degradation requirements and preparation process of the self-cleaning degradable fracturing temporary plugging agent. During the preparation and production, the content of the components is adjusted according to the requirements of the temporary plugging agent on the use temperature and the degradation time.
The invention also provides a preparation method of the self-cleaning degradable fracturing temporary plugging agent, which comprises the following steps:
step 1: the preferred degradable material is subjected to a forced air drying process to remove moisture from the degradable material: the drying temperature of the polylactic acid is 80-95 ℃; the drying temperature of the poly (butylene succinate) is 60-75 ℃; drying the polycaprolactone at 50-55 ℃; drying the polyhydroxybutyrate at the temperature of 80-95 ℃; the four degradable materials are dried by air blowing for 5-16 hours;
step 2: respectively weighing the degradable material dried in the step 1, a chain extender, a hydrophilic agent, an accelerant and a nano reinforcing agent according to a certain mass ratio, and adding the raw materials into a mixing roll for melt mixing reaction; for a mixture composed of different degradable materials, the temperature of the melting mixing reaction is 5-20 ℃ higher than that of the degradable material with the highest melting point;
and step 3: the time of the melting and mixing reaction is 10-25 minutes;
and 4, step 4: after the mixing reaction is finished, the degradable fracturing temporary plugging agent with different particle sizes can be prepared by extruding, cutting, cooling, granulating and screening.
According to the reservoir conditions and different using purposes, the method also comprises the following steps: and (3) stretching and shaping the mixed product obtained by the reaction in the step (3) by using a melt spinning machine to form fiber yarns with the diameter of 10-150 micrometers, and then shearing the fiber yarns into short fiber yarns with the length of 2-15 millimeters, so that the self-cleaning fracturing temporary plugging agent fibers with different lengths can be prepared.
In the self-cleaning degradable fracturing temporary plugging agent, ester groups exist in degradable materials and are easy to hydrolyze, and the existence of terminal hydroxyl groups enables the degradable materials to have ester alcoholysis and is easy to initiate depolymerization and degradation at high temperature, so that the self-cleaning degradable fracturing temporary plugging agent has good degradation performance. The hydrophilic agent can improve the hydrophilicity of the temporary plugging agent, so that the temporary plugging agent is easier to carry out hydrolysis reaction, and the degradation time is reduced. The accelerator can reduce the activation energy required by the temporary plugging agent to degrade at high temperature, thereby reducing the degradation temperature of the temporary plugging agent. The nano particles are used as the filler, so that the cost is low, and the strength of the product can be improved.
The invention also discloses a method for increasing the fracturing yield of the oil and gas field, which comprises the preparation method of the self-cleaning degradable fracturing temporary plugging agent.
Based on the above situation, compared with the prior art, the present application has the following outstanding effects:
(1) the self-cleaning degradable fracturing temporary plugging agent is stable under low temperature (below 50 ℃) and can be placed for a long time.
(2) The self-cleaning degradable fracturing temporary plugging agent is softened, deformed and agglomerated at the temperature of the stratum, and is bonded with each other to form a compact temporary plugging layer, so that the temporary plugging agent has good self-adaptive capacity for cracks of different shapes and sizes, the maximum breakthrough pressure is over 40MPa, effective plugging can be realized for the stratum, and the plugging strength is high.
(3) The self-cleaning degradable fracturing temporary plugging agent utilizes the difference of the degradation performance and the softening point of different degradable materials, the applicable temperature is adjustable at 80-150 ℃, the degradation rate reaches more than 95 percent, and CO is generated after complete degradation2And H2And O, no damage is caused to the reservoir and the flow guide section.
(4) The self-cleaning degradable fracturing temporary plugging agent can be processed into a particle type temporary plugging agent or a fiber type temporary plugging agent according to different reservoir conditions and different use purposes.
Drawings
FIG. 1: the invention embodiment 1 temporary plugging agent breakthrough pressure test principle sketch map;
FIG. 2: the temporary plugging displacement pressure curve of the temporary plugging agent in the embodiment 1 of the invention is temporarily plugged in different plugging agent layer thicknesses.
Detailed Description
The following description is presented to disclose the invention so as to enable any person skilled in the art to practice the invention. The preferred embodiments in the following description are given by way of example only, and other obvious variations will occur to those skilled in the art.
First, preparation of self-cleaning degradable fracturing temporary plugging agent
Example 1
The preparation method of the self-cleaning degradable fracturing temporary plugging agent provided by the embodiment comprises the following steps:
weighing 0.5% of hydroquinone dihydroxyethyl ether, 3% of polyethylene glycol 1000, 0.1% of ethanolamine, 10% of nano calcium carbonate and 86.4% of degradable material (90% of polylactic acid and 10% of polybutylene succinate) according to the mass ratio. Adding the mixture into a mixing roll, stirring and heating the mixture for 15min at the temperature of 200 ℃, uniformly mixing the mixture, extruding the mixture through a screw, cutting the mixture into sections, extruding the sections, cooling the sections, granulating the sections, and screening the sections to prepare a finished product of the self-cleaning degradable fracturing temporary plugging agent.
Example 2
The preparation method of the self-cleaning degradable fracturing temporary plugging agent provided by the embodiment comprises the following steps:
weighing 0.3% of 1, 4-butanediol, 1% of chitosan, 0.5% of ethanolamine, 12% of nano silicon dioxide and 86.2% of degradable material (90% of polybutylene succinate and 10% of polycaprolactone) according to the mass ratio. Adding the mixture into a mixing roll, stirring and heating the mixture for 20min at 125 ℃, uniformly mixing the mixture, extruding the mixture through a screw, cutting the mixture into sections, extruding the sections, cooling the sections, granulating the sections, and screening the sections to prepare a finished product of the self-cleaning degradable fracturing temporary plugging agent.
Example 3
The preparation method of the self-cleaning degradable fracturing temporary plugging agent provided by the embodiment comprises the following steps:
weighing 0.5% of hydroquinone dihydroxyethyl ether, 5% of polyethylene glycol 2000, 0.2% of ethanolamine, 15% of nano calcium carbonate and 79.3% of degradable material (30% of polylactic acid and 70% of polybutylene succinate) according to the mass ratio. Adding the mixture into a mixing roll, stirring and heating the mixture for 15min at the temperature of 200 ℃, uniformly mixing the mixture, extruding the mixture through a screw, cutting the mixture into sections, extruding the sections, cooling the sections, granulating the sections, and screening the sections to prepare a finished product of the self-cleaning degradable fracturing temporary plugging agent.
Example 4
The preparation method of the self-cleaning degradable fracturing temporary plugging agent provided by the embodiment comprises the following steps:
weighing 0.5% of resorcinol dihydroxyethyl ether, 3% of polyethylene glycol 800, 0.5% of ethanolamine, 10% of nano calcium carbonate and 86% of degradable material (30% of polylactic acid and 70% of polybutylene succinate) according to the mass ratio. Adding into a mixing roll, stirring and heating at 200 deg.C for 15min, mixing well, and cooling to obtain resin alloy. And heating the mixture to 195 ℃ by using a melt spinning machine, then stretching and shaping at 80 ℃ to form fiber yarns with the diameter of 10-150 micrometers, and then shearing the fiber yarns into short fiber yarns with the length of 2-15 millimeters, thereby preparing the finished self-cleaning degradable fracturing temporary plugging agent fibers with different lengths.
Second, performance test of degradable fracturing temporary plugging agent
The self-cleaning degradable fracturing temporary plugging agent prepared in the embodiment is tested for degradation performance, flowback performance and plugging strength.
(1) Degradation Properties
The self-cleaning degradable fracturing temporary plugging agents synthesized in the embodiment 1 and the embodiment 2 are respectively prepared into 3% temporary plugging agent solutions, the time required for the complete degradation of the degradable fracturing temporary plugging agents at different temperatures is measured, the degradation performance of the degradable fracturing temporary plugging agents is evaluated, the test results of the temporary plugging agents in the embodiment 1 are shown in table 1, and the test results of the temporary plugging agents in the embodiment 2 are shown in table 2.
Table 1 example 1 temporary plugging agent degradation performance
Table 2 example 2 temporary plugging agent degradation performance
As can be seen from Table 1 and from Table 2, the temporary plugging agents have substantially the same degradation performance in different solution media. The temporary plugging agent of the embodiment 1 has a softening point of about 90 ℃ and a melting point of about 160 ℃, and is suitable for a stratum at 100-140 ℃; the temporary plugging agent of the embodiment 2 has a softening point of about 80 ℃ and a melting point of about 105 ℃, and is suitable for a stratum with the temperature of 80-100 ℃. Compared with other degradable temporary plugging agents, the degradable temporary plugging agent has high degradation rate and wide application range.
(2) Flow-back performance
The self-cleaning degradable fracturing temporary plugging agent synthesized in the embodiment 3 is prepared into temporary plugging agent solutions with different mass concentrations. After the temporary plugging agent solution is placed in an oil bath kettle at 120 ℃ and is heated to be completely degraded, the supernatant liquid is taken, the viscosity and the surface tension of the temporary plugging agent solution are measured at normal temperature, and the test results are shown in table 3.
As can be seen from Table 3, the viscosity of the solution after degradation of the temporary plugging agent is close to that of water (less than 2 mPas), and the temporary plugging agent does not substantially increase the viscosity of the solution. The surface tension of the solution is slightly reduced along with the increase of the concentration of the temporary plugging agent, but the influence is not large, and the surface tension of the temporary plugging agent solution is less than 40 mN.m.-1. The experimental data in table 3 show that the synthesized temporary plugging agent is easy to flow back after being dissolved, can meet the flow back requirement after on-site fracturing construction, and cannot cause obvious damage to a reservoir.
TABLE 3 Performance of temporary plugging agent degradation solutions
(3) Breakthrough pressure determination
In the hydraulic fracturing process, the main function of the temporary plugging agent is to realize temporary plugging of the microcracks, reduce the filtration loss and pressure dissipation of the fracturing fluid, and automatically dissolve and flowback the temporary plugging agent, and the plugging effect of the temporary plugging agent is a key parameter for judging whether the temporary plugging agent can play a temporary plugging steering effect. Therefore, the plugging performance of the temporary plugging agent is evaluated by testing the breakthrough pressure of the temporary plugging agent.
The principle of the temporary plugging agent breakthrough pressure test is shown in fig. 1, and the specific experimental process is as follows:
(a) preparing a standard rock core, and carrying out manual seam making on the standard rock core;
(b) the temporary plugging agent of example 1 and quartz sand (sand particle size 0.1mm-0.2mm) were filled into the cracks according to a certain amount to form plugging sections and sand-laying sections, and the mass M of the dry core was measured1；
(c) Putting the core into a core holder with a heating device, injecting simulated water at the speed of 1mL/min, wiping off formation water on the surface of the core after the core is fully saturated, and weighing the mass M of the core after the core is saturated with water2And calculating the pore volume of the rock core;
(d) setting the temperature at 110 ℃, injecting simulated water at the speed of 1mL/min after aging for 30min (softening deformation and adhesion agglomeration of the temporary plugging agent), and recording the pressure change condition and breakthrough pressure in the water injection process.
The specific experiment result is shown in fig. 2, and the temporary plugging agent has a good plugging effect. The plugging strength of the temporary plugging agent is related to the thickness of the temporary plugging agent layer filter cake, and the plugging strength can be improved by increasing the thickness of the plugging agent layer (increasing the using concentration of the temporary plugging agent on site). When the thickness of the filter cake of the plugging agent layer is 1.2cm, the maximum breakthrough pressure of the temporary plugging agent is more than 40MPa, and the requirement on the plugging strength of the stratum can be met.
(4) Core damage rate determination
The damage degree of the fracturing temporary plugging agent to the stratum is an important index for evaluating the performance of the temporary plugging agent, and the damage of the temporary plugging agent to the reservoir is mainly the damage to the core matrix. The experiment mainly evaluates the damage of the fracturing temporary plugging agent to the permeability of the rock core matrix and provides a basis for reservoir protection. The specific experimental method is as follows:
the experimental process is as follows: drying and vacuumizing rock core, saturating formation water → water permeability K0→ 2PV extrusion and 3% temporary plugging agent degradation liquid → core permeability K1→ calculation of the damage rate of the temporary plugging agent degradation liquid to the core matrix ηd. The results of the experiment are shown in Table 5.
TABLE 4 damage rate of temporary plugging agent to core matrix of different permeability
Through the rock core injury rate of 3 different permeabilities of contrast, the temporary plugging agent is great relatively to the injury rate of low permeable formation, and is less relatively to the injury of high permeable formation, but the rock core injury rate all is below 3%, and whole injury is less, can not harm the stratum, is fit for the field application.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are merely illustrative of the principles of the invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. A self-cleaning degradable fracturing temporary plugging agent is characterized in that: the paint comprises the following components in percentage by mass: 78-90.85% of degradable material, 0.1-1% of chain extender, 1-5% of hydrophilic agent, 0.05-1% of accelerator and 8-15% of nano reinforcing agent.
2. The self-cleaning degradable fracturing temporary plugging agent of claim 1, wherein: the degradable material is as follows: one or more than two of polylactic acid, polybutylene succinate, polycaprolactone and polyhydroxybutyrate.
3. The self-cleaning degradable fracturing temporary plugging agent of claim 1, wherein: the chain extender is: one or more of hydroquinone dihydroxyethyl ether, resorcinol dihydroxyethyl ether, 1, 4-butanediol, 1, 6-ethanediol and bisphenol A.
4. The self-cleaning degradable fracturing temporary plugging agent of claim 1, wherein: the hydrophilic agent is one or a compound of more than two of dopamine, polyethylene glycol and chitosan.
5. The self-cleaning degradable fracturing temporary plugging agent of claim 1, wherein: the accelerant is: one or more than two of ethanolamine, triethanolamine, triisopropanolamine, ethylenediamine, triethylenetetramine and polyethyleneimine.
6. The self-cleaning degradable fracturing temporary plugging agent of claim 1, wherein: the nano reinforcing agent is: one or more than two compounds of nano calcium carbonate, nano silicon dioxide, nano titanium dioxide and nano barium sulfate, and the particle diameter of the compound is 10-50 nm.
7. The self-cleaning degradable fracturing temporary plugging agent of claim 2, wherein: the degradable material is as follows: the weight average molecular weight of the polylactic acid is 0.5-15 ten thousand, the softening point is 58-60 ℃, and the melting point is about 180 ℃; the weight average molecular weight of the poly (butylene succinate) is 0.5-10 ten thousand, the softening point is 96-98 ℃, and the melting point is about 114 ℃; the weight average molecular weight of the polycaprolactone is 0.5-12 ten thousand, the softening point is about 55 ℃, and the melting point is about 62 ℃; the weight average molecular weight of the polyhydroxybutyrate is 0.5-15 ten thousand, the softening point is about 147 ℃, and the melting point is about 175 ℃.
8. A method for preparing the self-cleaning degradable fracturing temporary plugging agent based on any one of claims 1 to 7, which is characterized by comprising the following steps:
step 1: the preferred degradable material is subjected to a forced air drying process to remove moisture from the degradable material: the drying temperature of the polylactic acid is 80-95 ℃; the drying temperature of the poly (butylene succinate) is 60-75 ℃; drying the polycaprolactone at 50-55 ℃; drying the polyhydroxybutyrate at the temperature of 80-95 ℃; the four degradable materials are dried by air blowing for 5-16 hours;
step 2: respectively weighing the degradable material dried in the step 1, a chain extender, a hydrophilic agent, an accelerant and a nano reinforcing agent according to a certain mass ratio, and adding the raw materials into a mixing roll for melt mixing reaction; for a mixture composed of different degradable materials, the temperature of the melting mixing reaction is 5-20 ℃ higher than that of the degradable material with the highest melting point;
and step 3: the time of the melting and mixing reaction is 10-25 minutes;
and 4, step 4: after the mixing reaction is finished, the degradable fracturing temporary plugging agent with different particle sizes can be prepared by extruding, cutting, cooling, granulating and screening.
9. A self-cleaning degradable fracturing temporary plugging agent applied to oil fields, which comprises the self-cleaning degradable fracturing temporary plugging agent as claimed in any one of claims 1 to 7, and further comprises that the temporary plugging agent can be mutually bonded to form a compact temporary plugging layer through softening-deforming-clustering at the formation temperature, has good self-adaptive capacity for cracks with different shapes and sizes, and has the maximum breakthrough pressure of more than 40 MPa; the applicable temperature is 80-140 ℃, the degradation rate is more than 95%, and CO is generated after degradation2And H2And O, no damage is caused to the reservoir and the flow guide section.
10. A method for fracturing and yield increasing of oil and gas fields is characterized in that: the preparation method and the application of the self-cleaning degradable fracturing temporary plugging agent comprise any one of claims 8 to 9, and the temporary plugging diversion in cracks or the temporary plugging diversion between layers is realized in the fracturing process, so that the fracturing effect is improved.
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| CN112745819A (en) * | 2021-02-05 | 2021-05-04 | 西南石油大学 | Degradable temporary plugging agent and preparation method thereof |
| CN113150755A (en) * | 2021-04-29 | 2021-07-23 | 西南石油大学 | Preparation method of filtrate reducer, drilling fluid and preparation method of drilling fluid |
| CN113403051A (en) * | 2021-06-23 | 2021-09-17 | 新疆中凌工程技术有限公司 | Self-adaptive temporary plugging ball and manufacturing method thereof |
| CN114737940A (en) * | 2022-05-12 | 2022-07-12 | 美服(四川)能源技术有限公司 | Three-dimensional well zone seepage temporary plugging volume fracturing method |
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