CN108793865B - Water shutoff agent for bottom water reservoir oil well - Google Patents
Water shutoff agent for bottom water reservoir oil well Download PDFInfo
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- CN108793865B CN108793865B CN201810491994.XA CN201810491994A CN108793865B CN 108793865 B CN108793865 B CN 108793865B CN 201810491994 A CN201810491994 A CN 201810491994A CN 108793865 B CN108793865 B CN 108793865B
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- 239000003795 chemical substances by application Substances 0.000 title claims abstract description 125
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 89
- 239000003129 oil well Substances 0.000 title claims abstract description 49
- 239000004568 cement Substances 0.000 claims abstract description 38
- 235000020681 well water Nutrition 0.000 claims abstract description 32
- 238000002156 mixing Methods 0.000 claims abstract description 17
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 54
- 239000012744 reinforcing agent Substances 0.000 claims description 51
- 235000018553 tannin Nutrition 0.000 claims description 40
- 229920001864 tannin Polymers 0.000 claims description 40
- 239000001648 tannin Substances 0.000 claims description 40
- 239000005543 nano-size silicon particle Substances 0.000 claims description 26
- 235000012239 silicon dioxide Nutrition 0.000 claims description 26
- 241000218652 Larix Species 0.000 claims description 20
- 235000005590 Larix decidua Nutrition 0.000 claims description 20
- 238000003756 stirring Methods 0.000 claims description 20
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- 239000000203 mixture Substances 0.000 claims description 10
- 238000002360 preparation method Methods 0.000 claims description 10
- 238000006277 sulfonation reaction Methods 0.000 claims description 10
- 239000000725 suspension Substances 0.000 claims description 7
- 239000003973 paint Substances 0.000 claims 1
- 230000008719 thickening Effects 0.000 abstract description 16
- 239000002114 nanocomposite Substances 0.000 description 28
- 239000000047 product Substances 0.000 description 12
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- 239000002086 nanomaterial Substances 0.000 description 2
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- 239000000126 substance Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 1
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- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 239000002349 well water Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/426—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells for plugging
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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
- C09K8/42—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells
- C09K8/46—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement
- C09K8/467—Compositions for cementing, e.g. for cementing casings into boreholes; Compositions for plugging, e.g. for killing wells containing inorganic binders, e.g. Portland cement containing additives for specific purposes
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00241—Physical properties of the materials not provided for elsewhere in C04B2111/00
- C04B2111/00293—Materials impermeable to liquids
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention belongs to the technical field of water plugging of oil wells used in oil exploitation, and particularly relates to a bottom water reservoir oil well water plugging agent which is prepared by mixing the following components in percentage by weight: the water plugging agent produced according to the formula overcomes the technical problems of short thickening time, easy shrinkage after curing and low bonding strength with the stratum of the conventional cement plugging agent, can effectively plug the water outlet cracks of a high-water-cut well of a low-permeability bottom water reservoir, and can meet the pressure bearing requirement of fracturing and increasing yield after water plugging.
Description
Technical Field
The invention belongs to the technical field of water plugging of oil wells used in oil exploitation, and particularly relates to a water plugging agent for a bottom water reservoir oil well.
Background
In the process of developing a low-permeability bottom water oil reservoir, due to the influence of formation cracks and heterogeneity and the production of fracturing modification, bottom water is communicated after oil well measures are easily caused, the water content rise range is large, the water content is high, and the production of the oil well and the long-term stable production of the oil field are seriously influenced by the existence of the wells. The conventional water control and plugging technology at present can not meet the requirements of water control and yield increase of the oil reservoirs. The bottom water reservoir water plugging control technology starts exploration and research at home and abroad in the early 90 s, and through development and progress of over ten years, the technologies aiming at medium-high permeability oil fields, such as bottom water reservoir early water plugging, bottom water flooded well water plugging and the like, appear. However, the technical bottleneck always exists in the aspect of water control and plugging of the low-permeability bottom water reservoir: on one hand, the conventional chemical water plugging of an oil well is mainly a polymer plugging agent, while a high-water-cut well with a low-permeability bottom water reservoir is high in water outlet strength and high in well head pressure, and the strength of the polymer plugging agent cannot meet the plugging requirement easily; on the other hand, for low-permeability bottom water reservoirs, in the prior art, the low injectability of high-strength plugging agents such as cement with high strength and the like is poor, so that the reservoir in the near wellbore area is easily damaged, the high-strength plugging agents are easily shrunk after being solidified, the bonding strength with the stratum is low, and the problems of incapability of plugging a high-water-content well or high difficulty in increasing the yield after plugging are presented.
Therefore, in order to solve the problems, the invention provides a formula of the water plugging agent for the oil well of the bottom water reservoir, the water plugging agent produced according to the formula overcomes the technical problems of short thickening time, easy shrinkage after curing and low bonding strength with the stratum of the conventional cement plugging agent, can effectively plug the water outlet cracks of a high water-bearing well of a low-permeability bottom water reservoir, and can meet the pressure bearing requirement of fracturing yield increase after water plugging.
Disclosure of Invention
The invention aims to solve the problems that the conventional chemical water plugging of an oil well is mainly a polymer plugging agent, while a high-water-content well of a low-permeability bottom water reservoir is high in water output strength and high in well head pressure, and the strength of the polymer plugging agent cannot meet the plugging requirement easily; the problem that the low-permeability bottom water oil is hidden in the prior art, the reservoir stratum in the near wellbore area is easily damaged due to poor injectability of high-strength plugging agents such as cement with high strength, the plugging agents are easily shrunk after being solidified, the strength of cementing with the formation is low, and the high-water-content wells cannot be plugged or the difficulty of increasing the yield after plugging is high is solved.
Therefore, the invention provides a bottom water reservoir oil well water shutoff agent which is prepared by mixing the following components in percentage by weight: 50-98% of main agent, 1-30% of nano reinforcing agent and 1-20% of retarder.
The main agent is G-grade cement or superfine cement, and the grain size range of the G-grade cement or the superfine cement is 0.2-20 mu m.
The nano reinforcing agent is hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide in a mass ratio of 4: 1-1: 4, and (3) mixing.
The retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products.
The mass ratio of the hydrophilic nano silicon dioxide to the oleophilic nano silicon dioxide is 1: 1.
The particle size of the nano reinforcing agent is less than 50 nm.
The plugging agent of the bottom water reservoir oil well is a plugging agent suspension with the mass concentration of 50%, and the plugging agent suspension with the mass concentration of 50% is formed by mixing the following components in percentage by weight: 80% of superfine cement, 15% of nano reinforcing agent and 5% of retarder.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: adding 50-98 wt% of main agent, 1-30 wt% of nano reinforcing agent and 1-40 wt% of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
The invention has the beneficial effects that:
1. the nano composite high-strength plugging agent produced according to the formula disclosed by the invention is simple to prepare, the thickening time is controllable, the thickening time can be regulated according to design requirements, and the difficult problems that the conventional cement plugging agent is short in thickening time and is easy to cause underground safety accidents are solved.
2. The nano composite high-strength plugging agent produced according to the formula of the invention slightly expands after being cured, and solves the problems that the conventional cement plugging agent is easy to shrink after being cured and has low bonding strength with the stratum.
3. The nano composite high-strength plugging agent produced according to the formula of the invention has high compressive strength after curing due to the filling of the nano material, and solves the problems that the conventional cement plugging agent has low strength after curing and cannot meet the requirements of fracturing yield increase transformation after water plugging.
Drawings
The present invention will be described in further detail below with reference to the accompanying drawings.
FIG. 1 is a thickening curve of a nanocomposite high strength plugging agent at a mass concentration of 50%;
FIG. 2 is a compressive strength curve of the nanocomposite high-strength plugging agent with a mass concentration of 50%.
Detailed Description
Example 1:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 50-98% of main agent, 1-30% of nano reinforcing agent and 1-20% of retarder. The main agent is G-grade cement or superfine cement, and the grain size range of the G-grade cement or the superfine cement is 0.2-20 mu m; the nano reinforcing agent is hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide in a mass ratio of 4: 1-1: 4, mixing the mixture; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is less than 50 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: adding 50-98 wt% of main agent, 1-30 wt% of nano reinforcing agent and 1-40 wt% of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
The invention has the beneficial effects that:
1. the nano composite high-strength plugging agent produced according to the formula disclosed by the invention is simple to prepare, the thickening time is controllable, the thickening time can be regulated according to design requirements, and the difficult problems that the conventional cement plugging agent is short in thickening time and is easy to cause underground safety accidents are solved.
2. The nano composite high-strength plugging agent produced according to the formula of the invention slightly expands after being cured, and solves the problems that the conventional cement plugging agent is easy to shrink after being cured and has low bonding strength with the stratum.
3. The nano composite high-strength plugging agent produced according to the formula of the invention has high compressive strength after curing due to the filling of the nano material, and solves the problems that the conventional cement plugging agent has low strength after curing and cannot meet the requirements of fracturing yield increase transformation after water plugging.
Example 2:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 50% of main agent, 10% of nano reinforcing agent and 40% of retarder. The main agent is G-grade cement with the grain size of 10 mu m; the nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide according to the mass ratio of 1: 1; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is 50 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: adding 50 weight percent of main agent, 10 weight percent of nano reinforcing agent and 40 weight percent of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
Example 3:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 50% of main agent, 10% of nano reinforcing agent and 40% of retarder. The main agent is superfine cement with the particle size of 15 mu m; the nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide according to the mass ratio of 1: 1; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is 40 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: adding 50 weight percent of main agent, 10 weight percent of nano reinforcing agent and 40 weight percent of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
Example 4:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 70% of main agent, 5% of nano reinforcing agent and 25% of retarder. The main agent is G-grade cement with the particle size of 12 mu m; the nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide according to the mass ratio of 1: 1; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is 30 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: and adding 70 wt% of main agent, 5 wt% of nano reinforcing agent and 25 wt% of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
Example 5:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 90% of main agent, 2% of nano reinforcing agent and 8% of retarder. The main agent is superfine cement with the particle size of 5 mu m; the nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide according to the mass ratio of 1: 1; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is 20 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: and (2) adding 90 wt% of a main agent, 2 wt% of a nano reinforcing agent and 8 wt% of a retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
Example 6:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 85% of main agent, 5% of nano reinforcing agent and 10% of retarder. The main agent is superfine cement with the particle size of 20 mu m; the nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide according to the mass ratio of 1: 1; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is 10 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: adding 85 wt% of main agent, 5 wt% of nano reinforcing agent and 10 wt% of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
Example 7:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 80% of main agent, 10% of nano reinforcing agent and 10% of retarder. The main agent is superfine cement with the grain size of 0.2 mu m; the nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide according to the mass ratio of 1: 1; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is 15 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: and (2) adding 80 weight percent of main agent, 10 weight percent of nano reinforcing agent and 10 weight percent of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
Example 8:
the bottom water reservoir oil well water shutoff agent is prepared by mixing the following components in percentage by weight: 80% of main agent, 15% of nano reinforcing agent and 5% of retarder. The main agent is superfine cement with the particle size of 13 mu m; the nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide according to the mass ratio of 1: 1; the retarder is larch sulfonated tannin extract, and the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products; the particle size of the nano reinforcing agent is 25 nm.
The preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: and (2) adding 80 wt% of a main agent, 15 wt% of a nano reinforcing agent and 5 wt% of a retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
The hydrophilic nano-silica and the lipophilic nano-silica of examples 1 to 8 of the present invention are all available products, and are commercially available.
The effect evaluation experiment and the result of the invention are as follows:
FIG. 1 is a thickening curve of a nanocomposite high strength plugging agent at a concentration of 50% by mass. The thickening time of the nano composite high-strength plugging agent has important significance for safe construction in practical application. The thickening time of the novel retarder is controllable due to the addition of the novel retarder, the thickening time can be regulated according to design requirements, and the difficult problems that the thickening time of the conventional cement-based plugging agent is short and underground safety accidents are easily caused are solved. Fig. 1 researches and evaluates the thickening condition of 50% mass concentration nano composite high-strength plugging agent suspension mixed by 80% superfine cement, 15% nano reinforcing agent and 5% retarder according to an optimal formula under the experimental conditions of 50 ℃ temperature and 25MPa pressure, and the experimental result shows that when the consistency of the plugging agent reaches 40Bc which is difficult to pump, the thickening time is more than 7h, and the requirement of site construction safety is completely met. The apparatus used was a 9360 pressure boost densifier available from thousand deller, usa.
FIG. 2 is a compressive strength curve of the nanocomposite high-strength plugging agent with a mass concentration of 50%. The compressive strength of the nano composite high-strength plugging agent has important significance on subsequent fracturing yield-increasing transformation after water plugging in practical application. Fig. 2 is a study of a 50% mass concentration nano composite high strength plugging agent suspension prepared by mixing 80% of superfine cement, 15% of nano reinforcing agent and 5% of retarder according to an optimal formula, and a compression strength test is performed according to an API test method, wherein the test conditions are as follows: and respectively maintaining for 24 hours, 48 hours and 72 hours at the temperature of 50 ℃, and testing the compression strength of the set cement. The experimental result shows that the 24-hour compressive strength is 24.3MPa, the 48-hour compressive strength is 29.7MPa, and the 72-hour compressive strength is 42.3MPa, and the compressive strength of the nano composite high-strength plugging agent is greatly improved by adding the nano reinforcing agent, so that the requirements of fracturing yield increase transformation after water plugging are completely met. The used instrument is a WHY-10/300 type microcomputer-controlled full-automatic pressure tester of Shanghai Hualong.
Table 150% mass concentration nano composite high strength plugging agent expansion rate experimental data table
Table 1 is a table of experimental data of expansion rate of 50% mass concentration of the nanocomposite high-strength plugging agent under different nano-reinforcing agent addition (50% mass concentration of nanocomposite high-strength plugging agent suspension). The nano reinforcing agent is a mixture of hydrophilic nano silicon dioxide and lipophilic nano silicon dioxide, the grain diameter is less than 50nm, and the nano reinforcing agent permeates into the crystal lattice of a hydration product in the hydration process of cement grains to generate crystal lattice expansion, so that volume shrinkage generated after cement paste is hydrated is prevented, the compressive strength of the nano composite high-strength plugging agent after solidification can be improved, and the crystal lattice structure of the hydration product is not damaged. The shrinkage of the nano composite high-strength plugging agent is tested through different addition amounts of the nano reinforcing agent indoors, and experimental results show that when the nano reinforcing agent is not added, the nano composite high-strength plugging agent shrinks after being cured, the shrinkage is 3.2%, when the addition amount of the nano reinforcing agent is more than 2%, the nano composite high-strength plugging agent cannot shrink after being cured, and the nano composite high-strength plugging agent has a certain micro-expansion effect, so that the nano composite high-strength plugging agent is effectively cemented with a stratum after being cured, and no micro-gap phenomenon exists. The instrument used was a cement shrinkage-expansion analyzer.
Technical index of nano composite high-strength plugging agent with mass concentration of 250% (experiment temperature 50 ℃ C.)
Table 2 shows the performance indexes of the nanocomposite high strength plugging agent, and the performance indexes of the nanocomposite high strength plugging agent in examples 1 to 8 should meet the requirements of table 2.
In a water plugging test of a bottom water reservoir oil well in the same block, a conventional water plugging process and a water plugging agent are applied to water plugging construction in the early stage, and the effective rate of the measure is less than 50%; after the field test of the nano composite high-strength plugging agent produced by the embodiment, the effective rate of the water plugging measure is more than 90 percent, the success rate of increasing the production of fracturing and production-increasing reconstruction subsequently performed on a successful well for water plugging is 100 percent, and the effect is obvious.
The above examples are merely illustrative of the present invention and should not be construed as limiting the scope of the invention, which is intended to be covered by the claims and any design similar or equivalent to the scope of the invention.
Claims (6)
1. The bottom water reservoir oil well water shutoff agent is characterized in that: the paint is prepared by mixing the following components in percentage by weight: 50-98% of main agent, 2-30% of nano reinforcing agent and 1-40% of retarder; the nano reinforcing agent is hydrophilic nano silicon dioxide and oleophilic nano silicon dioxide in a mass ratio of 4: 1-1: 4, mixing the mixture; the retarder is larch sulfonated tannin extract; the main agent is G-grade cement or superfine cement, and the grain size range of the G-grade cement or the superfine cement is 0.2-20 mu m.
2. The bottom water reservoir oil well plugging agent of claim 1, wherein: the main components of the larch sulfonated tannin extract are tannin and non-tannin sulfonation products.
3. The bottom water reservoir oil well plugging agent of claim 2, wherein: the mass ratio of the hydrophilic nano silicon dioxide to the oleophilic nano silicon dioxide is 1: 1.
4. The bottom water reservoir oil well plugging agent of claim 3, wherein: the particle size of the nano reinforcing agent is less than 50 nm.
5. The bottom water reservoir oil well plugging agent of claim 4, wherein: the plugging agent of the bottom water reservoir oil well is a plugging agent suspension with the mass concentration of 50%, and the plugging agent suspension with the mass concentration of 50% is formed by mixing the following components in percentage by weight: 80% of superfine cement, 15% of nano reinforcing agent and 5% of retarder.
6. The bottom water reservoir oil well plugging agent of claim 5, wherein: the preparation method of the bottom water reservoir oil well water shutoff agent comprises the following steps: adding 50-98 wt% of main agent, 2-30 wt% of nano reinforcing agent and 1-40 wt% of retarder into a kneader, stirring for more than 30min until the three are uniformly mixed, and stopping stirring to obtain the bottom water reservoir oil well water shutoff agent.
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