CN115216283A - Temporary plugging diverting agent and preparation method thereof - Google Patents
Temporary plugging diverting agent and preparation method thereof Download PDFInfo
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- CN115216283A CN115216283A CN202210970592.4A CN202210970592A CN115216283A CN 115216283 A CN115216283 A CN 115216283A CN 202210970592 A CN202210970592 A CN 202210970592A CN 115216283 A CN115216283 A CN 115216283A
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- 238000002360 preparation method Methods 0.000 title abstract description 13
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 101
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 63
- 229920000747 poly(lactic acid) Polymers 0.000 claims abstract description 51
- 239000004626 polylactic acid Substances 0.000 claims abstract description 51
- 229920002401 polyacrylamide Polymers 0.000 claims abstract description 36
- 229920002472 Starch Polymers 0.000 claims abstract description 35
- 235000019698 starch Nutrition 0.000 claims abstract description 35
- 239000008107 starch Substances 0.000 claims abstract description 35
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 20
- 239000002245 particle Substances 0.000 claims abstract description 14
- 238000002156 mixing Methods 0.000 claims description 15
- 230000000903 blocking effect Effects 0.000 claims description 12
- 238000001125 extrusion Methods 0.000 claims description 11
- 229920002261 Corn starch Polymers 0.000 claims description 9
- -1 ceramsite Polymers 0.000 claims description 9
- 239000008120 corn starch Substances 0.000 claims description 9
- 238000002844 melting Methods 0.000 claims description 7
- 230000008018 melting Effects 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- SEOVTRFCIGRIMH-UHFFFAOYSA-N indole-3-acetic acid Chemical compound C1=CC=C2C(CC(=O)O)=CNC2=C1 SEOVTRFCIGRIMH-UHFFFAOYSA-N 0.000 claims description 4
- 240000003183 Manihot esculenta Species 0.000 claims description 3
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 3
- 239000000945 filler Substances 0.000 abstract description 4
- 230000001105 regulatory effect Effects 0.000 abstract description 4
- 239000000919 ceramic Substances 0.000 abstract 1
- 235000011187 glycerol Nutrition 0.000 description 28
- 230000000052 comparative effect Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000005034 decoration Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- AOJJSUZBOXZQNB-VTZDEGQISA-N 4'-epidoxorubicin Chemical compound O([C@H]1C[C@@](O)(CC=2C(O)=C3C(=O)C=4C=CC=C(C=4C(=O)C3=C(O)C=21)OC)C(=O)CO)[C@H]1C[C@H](N)[C@@H](O)[C@H](C)O1 AOJJSUZBOXZQNB-VTZDEGQISA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K8/5086—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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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K8/5045—Compositions based on water or polar solvents containing inorganic compounds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- 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
- C09K8/514—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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- General Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- Compositions Of Macromolecular Compounds (AREA)
- Biological Depolymerization Polymers (AREA)
Abstract
The invention provides a temporary plugging diverting agent and a preparation method thereof, belonging to the technical field of temporary plugging diverting agents. The invention provides a temporary plugging diverting agent which is prepared from the following raw materials in percentage by mass: 20 to 25 percent of polyacrylamide, 36 to 55 percent of polylactic acid, 5 to 10 percent of ceramsite, 10 to 15 percent of starch and 5 to 15 percent of glycerol. The strength of the temporary plugging diverter is synergistically improved by taking polyacrylamide and polylactic acid as framework materials and regulating the dosage of the polyacrylamide and the polylactic acid, so that the pressure bearing capacity is improved; the ceramic particles are used as the propping agent, so that the pressure bearing capacity of the temporary plugging diverting agent is further improved; the starch is used as a filler, and the glycerol can improve the compatibility of the polylactic acid and the starch, so that the pressure bearing capacity of the temporary plugging diverter is further improved. Experimental results show that the pressure bearing capacity of the temporary plugging diversion agent provided by the invention is up to over 58 MPa.
Description
Technical Field
The invention relates to the technical field of temporary plugging diverting agents, in particular to a temporary plugging diverting agent and a preparation method thereof.
Background
With the continuous deepening of the exploration and development of oil and gas fields, the temporary plugging steering technology becomes a hot spot technology in reservoir transformation, and is successfully applied to the fields of old well repeated fracturing, horizontal well staged fracturing, vertical well staged fracturing and the like. The temporary plugging steering agent is one of the keys of the temporary plugging steering technology, and the temporary plugging material which has good plugging effect, low construction cost, convenient construction and controllable dissolution has important significance for the implementation of the temporary plugging steering technology.
At present, the temporary plugging diversion agent is mainly a granular temporary plugging diversion agent, and the granular temporary plugging diversion agent is prepared by crosslinking different materials to obtain high-viscosity crosslinked liquid, and then performing processes such as drying, shearing, granulating and the like. When a crack is plugged, the particle type temporary plugging diversion agent is mixed with clean water and then pumped into a stratum through a pump truck to temporarily plug perforation holes. However, the granular temporary plugging steering agent has poor pressure bearing strength, so that the plugging steering effect is poor. Therefore, how to improve the pressure bearing capacity of the temporary plugging diverting agent becomes a difficult problem to be solved urgently in the field.
Disclosure of Invention
The invention aims to provide a temporary plugging diverting agent and a preparation method thereof. The temporary plugging diverter provided by the invention has excellent pressure bearing capacity.
In order to achieve the above object, the present invention provides the following technical solutions:
the invention provides a temporary plugging diverting agent which is prepared from the following raw materials in percentage by mass: 20 to 25 percent of polyacrylamide, 36 to 55 percent of polylactic acid, 5 to 10 percent of ceramsite, 10 to 15 percent of starch and 5 to 15 percent of glycerol.
Preferably, the material is prepared from the following raw materials in percentage by mass: 22 to 24 percent of polyacrylamide, 40 to 50 percent of polylactic acid, 6 to 8 percent of ceramsite, 12 to 14 percent of starch and 8 to 15 percent of glycerol.
Preferably, the material is prepared from the following raw materials in percentage by mass: 22 to 23 percent of polyacrylamide, 45 to 50 percent of polylactic acid, 6 to 8 percent of ceramsite, 13 to 14 percent of starch and 9 to 10 percent of glycerol.
Preferably, the molecular weight of the polylactic acid is 900 to 1100 ten thousand, and the melting point of the polylactic acid is 175 ℃.
Preferably, the particle size of the ceramsite is 50-100 meshes.
Preferably, the starch is corn starch and/or tapioca starch.
Preferably, the particle size of the temporary blocking diverting agent is 100 to 200 meshes.
The invention also provides a preparation method of the temporary blocking diverting agent in the technical scheme, which comprises the following steps:
(1) Mixing polyacrylamide, polylactic acid, ceramsite, starch and glycerol to obtain a mixed material;
(2) And (2) performing extrusion molding on the mixed material obtained in the step (1) to obtain the temporary plugging diverter.
Preferably, the mixing time in the step (1) is 5 to 10min.
Preferably, the mixing in step (1) is performed in a high-speed mixer.
The invention provides a temporary plugging diverting agent which is prepared from the following raw materials in percentage by mass: 20 to 25 percent of polyacrylamide, 36 to 55 percent of polylactic acid, 5 to 10 percent of ceramsite, 10 to 15 percent of starch and 5 to 15 percent of glycerol. The strength of the temporary plugging diverter is synergistically improved by taking polyacrylamide and polylactic acid as framework materials and regulating the dosage of the polyacrylamide and the polylactic acid, so that the pressure bearing capacity is improved; the pressure-bearing capacity of the temporary blocking steering agent is further improved by taking the ceramsite as the propping agent; the starch is used as a filler, and the glycerol can improve the compatibility of the polylactic acid and the starch, so that the pressure bearing capacity of the temporary blocking diverter is further improved. Experimental results show that the pressure bearing capacity of the temporary plugging diversion agent provided by the invention reaches over 58 MPa.
Detailed Description
The invention provides a temporary plugging diverting agent which is prepared from the following raw materials in percentage by mass: 20 to 25 percent of polyacrylamide, 36 to 55 percent of polylactic acid, 5 to 10 percent of ceramsite, 10 to 15 percent of starch and 5 to 15 percent of glycerol.
The raw materials for preparing the temporary blocking steering agent comprise, by mass, 20-25% of polyacrylamide, preferably 22-24%, and more preferably 22-23%. The source of the polyacrylamide is not particularly limited in the present invention, and the polyacrylamide can be prepared by a commercially available product or a well-known preparation method which is well known to those skilled in the art. In the invention, the polyacrylamide is used as a framework material, and can be used for improving the pressure bearing capacity of the temporary plugging diverting agent in cooperation with polylactic acid.
The raw materials for preparing the temporary plugging diverter also comprise 36-55% of polylactic acid by mass percentage, preferably 40-50% of polylactic acid by mass percentage, and more preferably 45-50% of polylactic acid by mass percentage. In the present invention, the molecular weight of the polylactic acid is preferably 900 to 1100 ten thousand; the melting point of the polylactic acid is preferably 175 ℃. The source of the polylactic acid is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the invention, the polylactic acid is used as a framework material and can be used for improving the pressure bearing capacity of the temporary plugging diverting agent in a synergistic way with polyacrylamide.
The raw materials for preparing the temporary blocking steering agent also comprise 5-10% of ceramsite by mass percentage, preferably 6-8% of ceramsite, and more preferably 7% of ceramsite. In the invention, the particle size of the ceramsite is preferably 50-100 meshes. The source of the ceramsite is not particularly limited in the present invention, and commercially available products well known to those skilled in the art can be used. In the invention, the ceramsite is used as a propping agent and can effectively prop cracks, so that the pressure bearing capacity of the temporary plugging steering agent is further improved.
The raw materials for preparing the temporary plugging diversion agent also comprise 10-15% of starch, preferably 12-14%, and more preferably 13-14% by mass. In the present invention, the starch is preferably corn starch and/or tapioca starch. The source of the starch is not particularly limited in the present invention, and commercially available products known to those skilled in the art may be used. In the invention, the starch is used as a filler, and the pressure bearing capacity of the temporary plugging diverting agent can be further improved under the action of glycerol.
The raw materials for preparing the temporary plugging diverter also comprise 5-15% of glycerol, preferably 8-15% of glycerol, and more preferably 9-10% of glycerol by mass percentage. The source of the glycerol is not particularly limited in the present invention, and a commercially available product known to those skilled in the art may be used. In the invention, the glycerol is used as a compatibilizer, so that the compatibility of starch and polylactic acid can be improved, and the pressure bearing capacity of the temporary plugging steering agent is further improved.
In the present invention, the particle size of the temporary blocking diverting agent is preferably 100 to 200 mesh. According to the invention, the crack can be better filled by controlling the particle size of the temporary plugging diverting agent, so that the pressure bearing effect is further improved.
The strength of the temporary plugging diverter is synergistically improved by taking polyacrylamide and polylactic acid as framework materials and regulating the dosage of the polyacrylamide and the polylactic acid, so that the pressure bearing capacity is improved; the pressure-bearing capacity of the temporary blocking steering agent is further improved by taking the ceramsite as the propping agent; the starch is used as a filler, and the glycerol can improve the compatibility of the polylactic acid and the starch, so that the pressure bearing capacity of the temporary plugging diverter is further improved.
The invention also provides a preparation method of the temporary plugging diversion agent in the technical scheme, which comprises the following steps:
(1) Mixing polyacrylamide, polylactic acid, ceramsite, starch and glycerol to obtain a mixed material;
(2) And (2) performing extrusion molding on the mixed material obtained in the step (1) to obtain the temporary plugging diverter.
The invention mixes polyacrylamide, polylactic acid, ceramsite, starch and glycerol to obtain a mixed material.
In the present invention, the mixing of the polyacrylamide, polylactic acid, ceramsite, starch and glycerin is preferably performed in a high-speed mixer. The type of the high-speed mixer is not particularly limited, and instruments and equipment well known to those skilled in the art can be adopted.
In the invention, the time for mixing the polyacrylamide, the polylactic acid, the ceramsite, the starch and the glycerol is preferably 5-10 min. The temperature of the mixing is not particularly limited, and the mixing can be carried out at room temperature.
After the mixed material is obtained, the temporary plugging diversion agent is obtained by performing extrusion molding on the mixed material.
The extrusion molding operation is not specially limited, and the process parameters can be adjusted according to actual conditions.
After the extrusion molding is completed, the present invention preferably crushes the product obtained by the extrusion molding to obtain the temporary plugging diverting agent.
The operation of the crushing is not particularly limited in the present invention, as long as the particle size of the temporary plugging diverter is ensured to be 100 to 200 mesh.
The preparation method provided by the invention is simple in process and suitable for industrial production.
The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The temporary plugging diverting agent is prepared from the following raw materials in percentage by mass: 20% of polyacrylamide, 55% of polylactic acid, 5% of ceramsite, 10% of corn starch and 10% of glycerol; wherein the molecular weight of the polylactic acid is 900-1100 ten thousand, and the melting point is 175 ℃; the grain diameter of the ceramsite is 50-100 meshes; the particle size of the temporary plugging diverter is 100-200 meshes;
the preparation method of the temporary plugging diverting agent comprises the following steps:
(1) Mixing polyacrylamide, polylactic acid, ceramsite, starch and glycerol in a high-speed mixer for 10min to obtain a mixed material;
(2) And (2) sequentially carrying out extrusion molding and crushing on the mixed material obtained in the step (1) to obtain the temporary plugging diverter.
Comparative example 1
The formulation of the temporary blocking diverter was varied on the basis of example 1: the temporary plugging diverting agent is prepared from the following raw materials in percentage by mass: 75% of polyacrylamide, 5% of ceramsite, 10% of corn starch and 10% of glycerol, and the other conditions are unchanged.
Comparative example 2
The formulation of the temporary blocking diverter was varied on the basis of example 1: the temporary plugging diverting agent is prepared from the following raw materials in percentage by mass: 75% of polylactic acid, 5% of ceramsite, 10% of corn starch and 10% of glycerol, and the other conditions are unchanged.
Example 2
The temporary plugging diverting agent is prepared from the following raw materials in percentage by mass: 22% of polyacrylamide, 50% of polylactic acid, 10% of ceramsite, 10% of corn starch and 8% of glycerol; wherein the molecular weight of the polylactic acid is 900-1100 ten thousand, and the melting point is 175 ℃; the grain diameter of the ceramsite is 50-100 meshes; the particle size of the temporary plugging diverter is 100-200 meshes;
the preparation method of the temporary plugging diverting agent comprises the following steps:
(1) Mixing polyacrylamide, polylactic acid, ceramsite, starch and glycerol in a high-speed mixer for 10min to obtain a mixed material;
(2) And (2) sequentially carrying out extrusion molding and crushing on the mixed material obtained in the step (1) to obtain the temporary plugging diverter.
Example 3
The temporary plugging diverting agent is prepared from the following raw materials in percentage by mass: 23% of polyacrylamide, 45% of polylactic acid, 8% of ceramsite, 15% of corn starch and 9% of glycerol; wherein the molecular weight of the polylactic acid is 900-1100 ten thousand, and the melting point is 175 ℃; the grain diameter of the ceramsite is 50-100 meshes; the particle size of the temporary plugging diverter is 100-200 meshes;
the preparation method of the temporary plugging diverting agent comprises the following steps:
(1) Mixing polyacrylamide, polylactic acid, ceramsite, starch and glycerol in a high-speed mixer for 10min to obtain a mixed material;
(2) And (2) sequentially carrying out extrusion molding and crushing on the mixed material obtained in the step (1) to obtain the temporary plugging diverter.
Example 4
The temporary plugging diverting agent is prepared from the following raw materials in percentage by mass: 25% of polyacrylamide, 36% of polylactic acid, 13% of ceramsite, 12% of corn starch and 14% of glycerol; wherein the molecular weight of the polylactic acid is 900-1100 ten thousand, and the melting point is 175 ℃; the grain diameter of the ceramsite is 50-100 meshes; the particle size of the temporary plugging diverter is 100-200 meshes;
the preparation method of the temporary plugging diversion agent comprises the following steps:
(1) Mixing polyacrylamide, polylactic acid, ceramsite, starch and glycerol in a high-speed mixer for 10min to obtain a mixed material;
(2) And (2) sequentially carrying out extrusion molding and crushing on the mixed material obtained in the step (1) to obtain the temporary plugging diverter.
The temporary plugging diversion agents prepared in the examples 1-4 and the comparative examples 1-2 are subjected to pressure bearing capacity test, a temporary plugging agent plugging simulation experiment is carried out by utilizing a laboratory self-made steel core, and the experimental conditions are as follows: the pressure was increased for 10min and the pressure was maintained at constant pressure for 110min, the results are shown in Table 1.
TABLE 1 pressure-bearing Capacity data of temporary blocking steering agents prepared in examples 1 to 4 and comparative examples 1 to 2
| Example 1 | Example 2 | Example 3 | Example 4 | Comparative example 1 | Comparative example 2 | |
| Bearing capacity/MPa | 59 | 58 | 62 | 60 | 50 | 53 |
As can be seen from table 1, the temporary plugging diverter prepared in example 1 has higher pressure bearing capacity than those prepared in comparative examples 1-2, which shows that the pressure bearing capacity of the temporary plugging diverter can be synergistically improved by controlling the contents of polylactic acid and polyacrylamide; the pressure-bearing capacity of the temporary plugging diverting agent can be further improved by regulating and controlling the formula.
From the above examples, it can be seen that the temporary plugging diverter provided by the invention has excellent pressure bearing capacity.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The temporary blocking diverting agent is prepared from the following raw materials in percentage by mass: 20 to 25 percent of polyacrylamide, 36 to 55 percent of polylactic acid, 5 to 10 percent of ceramsite, 10 to 15 percent of starch and 5 to 15 percent of glycerol.
2. The temporary plugging diverting agent according to claim 1, which is prepared from the following raw materials in percentage by mass: 22 to 24 percent of polyacrylamide, 40 to 50 percent of polylactic acid, 6 to 8 percent of ceramsite, 12 to 14 percent of starch and 8 to 15 percent of glycerol.
3. The temporary plugging diverter according to claim 2, wherein the temporary plugging diverter is prepared from the following raw materials in percentage by mass: 22 to 23 percent of polyacrylamide, 45 to 50 percent of polylactic acid, 6 to 8 percent of ceramsite, 13 to 14 percent of starch and 9 to 10 percent of glycerol.
4. The temporary plugging diversion agent according to any one of claims 1 to 3, wherein the molecular weight of said polylactic acid is 900 to 1100 ten thousand, and the melting point of said polylactic acid is 175 ℃.
5. The temporary plugging diversion agent according to any one of claims 1 to 3, wherein the particle size of the ceramsite is 50 to 100 mesh.
6. The temporary plugging diversion agent of any one of claims 1-3, wherein said starch is corn starch and/or tapioca starch.
7. The temporary plugging diverting agent according to any one of claims 1 to 3, wherein the particle size of the temporary plugging diverting agent is 100 to 200 mesh.
8. A method for preparing the temporary plugging diversion agent of any one of claims 1-7, comprising the following steps:
(1) Mixing polyacrylamide, polylactic acid, ceramsite, starch and glycerol to obtain a mixed material;
(2) And (2) performing extrusion molding on the mixed material obtained in the step (1) to obtain the temporary plugging diverter.
9. The method of claim 8, wherein the mixing time in the step (1) is 5 to 10min.
10. The method of claim 8, wherein the mixing in step (1) is performed in a high-speed mixer.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115678522A (en) * | 2022-11-04 | 2023-02-03 | 大庆信辰油田技术服务有限公司 | Temporary plugging agent for heavy oil well and preparation method and application thereof |
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