CN111635744A - Composition for profile control and water shutoff, profile control and water shutoff agent and preparation method thereof, and method for resource utilization of white clay residue - Google Patents
Composition for profile control and water shutoff, profile control and water shutoff agent and preparation method thereof, and method for resource utilization of white clay residue Download PDFInfo
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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
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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
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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
- C09K8/60—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
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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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
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Abstract
The invention belongs to the technical field of chemicals for water shutoff and channeling sealing of oil and gas wells, and particularly relates to a composition for profile control and water shutoff, a profile control and water shutoff agent and a preparation method thereof, and a method for resource utilization of white clay residues. The composition for profile control and water shutoff consists of an auxiliary agent and the following components in parts by weight: 20-25 parts of clay slag and 20-30 parts of oil well cement. The composition for profile control and water shutoff is mixed with water to form the profile control and water shutoff agent. The invention takes the white clay residue as a material for profile control and water shutoff of the oil field, and provides a low-cost method for resource utilization of the white clay residue. Meanwhile, when the clay slag is matched with oil well cement to be used as a profile control water plugging agent, the plugging efficiency is as high as 99%.
Description
Technical Field
The invention belongs to the technical field of chemicals for water shutoff and channeling sealing of oil and gas wells, and particularly relates to a composition for profile control and water shutoff, a profile control and water shutoff agent and a preparation method thereof, and a method for resource utilization of white clay residues.
Background
Activated clay is often used for refining in the production processes of oil refining and petrochemical products, such as lubricant oil refining, paraffin wax decolorization and the like, so that a large amount of clay residue (spent clay) is generated. The activated clay mainly comprises inorganic oxides such as silicon dioxide and aluminum trioxide, and the clay slag formed after the activated clay is used also contains 20-35% of oil.
The traditional processing method of the white clay slag, such as landfill and incineration processing method, not only causes serious environmental pollution, but also causes resource waste. In order to realize the harmless treatment and resource utilization of the clay residues, Chinese patent application publication No. CN106221791B discloses a method for selectively deoiling base oil waste clay, which recycles oil components adsorbed in the clay residues. However, the clay residue after oil recovery still contains other impurities such as colloid, colored components and the like, and still faces the problems of treatment and discharge. In addition, some technologies for regenerating the clay slag exist in the prior art, but the process is complex and the regeneration frequency is limited.
In conclusion, the treatment pressure of the existing white clay residue waste is large, and an effective way for recycling the white clay residue is lacked.
Disclosure of Invention
The invention aims to provide a composition for profile control and water shutoff, which contains argil residues and aims to solve the problem of treatment of the existing argil residues.
The invention also aims to provide a profile control water shutoff agent adopting the composition for profile control water shutoff, and the profile control water shutoff agent has a better shutoff effect.
The invention also aims to provide a preparation method of the profile control water shutoff agent.
The invention also aims to provide a method for recycling the white clay residue, which can effectively utilize the white clay residue resource.
In order to achieve the purpose, the invention adopts the technical scheme that:
a composition for profile control and water shutoff comprises a profile control and water shutoff assistant and the following components in parts by weight: 20-25 parts of clay slag and 20-30 parts of oil well cement.
In the process of water injection exploitation, a water plugging agent is generally used for plugging and profile control in an oil field. Especially, in the process of thick oil thermal recovery steam injection, the steam absorption is uneven due to the physical property difference of the oil layer in the longitudinal direction and the plane, and steam channeling can be formed among wells after long-time steam injection development. The profile control and water shutoff of the injection water shutoff agent of the steam injection thermal recovery well is an effective measure for improving the thermal recovery development effect. The development of profile control water shutoff agents with better water shutoff effects is always an important work in the oil reservoir exploitation process.
The invention provides a novel composition for profile control and water shutoff, which is mainly used for mixing with water to form a profile control and water shutoff agent. The profile control water shutoff composition mainly comprises the white clay residue and oil well cement, wherein the oil well cement plays a role of a curing agent, the white clay residue is inorganic oxide particles, and the white clay residue and the inorganic oxide particles can meet the fluidity and the consolidation compressive strength required by a profile control water shutoff agent through reasonable proportion, and have better shutoff effect. In addition, the profile control and water shutoff composition takes the white clay residues as main components, the required amount of the white clay residues is large, a new method is provided for resource treatment of the white clay residues, and the discharge pressure of the white clay residues can be reduced, even the zero discharge of the white clay residues is realized. In addition, when the clay slag is used as the composition for profile control and water shutoff, the clay slag does not need to be treated, so that the treatment cost of the clay slag waste is reduced, and the cost is saved.
Preferably, the oil well cement used is a grade G medium-resistant oil well cement.
The profile control water shutoff auxiliary agent is an auxiliary agent commonly used by oil-containing well cement water shutoff agents in the prior art, such as a suspending agent and the like, and the profile control water shutoff auxiliary agent is beneficial to forming a stable and uniform dispersion system by the composition for profile control water shutoff and water and delaying initial setting time. Preferably, the profile control and water shutoff auxiliary agent comprises 0.2-0.3 part by weight of suspending agent and 0.3-0.5 part by weight of retarder.
When the composition for profile control and water shutoff is used specifically, the composition is mixed with water to form slurry, and then the slurry is injected into a stratum for shutoff. The suspension property of the white clay residue and the oil well cement in water is poor, so the composition for the profile control water shutoff agent adopts the suspending agent to improve the suspension property of the white clay residue and the oil well cement in water. The type of the used suspending agent can be adjusted according to actual conditions, and only the clay slag and the oil well cement form a stable and uniform suspension system in water. Preferably, the suspending agent is one or more of carboxymethyl cellulose, sodium carboxymethyl cellulose and hydroxyethyl cellulose.
In the process of injecting into the stratum, the oil well cement is gradually solidified to realize plugging, and the setting time is prolonged by adding the retarder. Preferably, the retarder is one or more of glucose, sodium gluconate, sucrose and molasses. Glucose, sodium gluconate, sucrose and molasses are all saccharides and can form a solvated water film on the surface of solid particles in the profile control water shutoff agent, such as oil well cement particles, so that the hydration process of the oil well cement particles is inhibited. The carbohydrate is used as the retarder, so that the initial setting time of the profile control water shutoff agent system can be prolonged by 7-8 h.
The profile control water shutoff agent adopts the technical scheme that:
the invention relates to a profile control water shutoff agent, which consists of water and the composition for profile control water shutoff.
The composition for profile control and water shutoff is mixed with water to form a profile control and water shutoff agent, and when profile control and water shutoff operations are carried out, the white clay residue and oil well cement are consolidated to form a consolidated body with certain compressive strength, so that the composition has a good shutoff effect, and the shutoff efficiency can reach 99%. Because the composition for profile control and water shutoff is a granular material, the profile control and water shutoff agent is a granular water shutoff agent, and is particularly suitable for heavy oil reservoirs with high permeability.
The preparation method of the profile control water shutoff agent adopts the technical scheme that:
a preparation method of a profile control water shutoff agent comprises the following steps: the white clay residue is dispersed in water to form a white clay residue dispersion system; and then uniformly mixing the clay residue dispersion system with oil well cement and a profile control and water plugging auxiliary agent.
The preparation method of the profile control water shutoff agent has the advantages of simple process and high production efficiency, and is suitable for field construction.
The clay slag is generally agglomerated large particles and is not easily dispersed in water, so when the clay slag is dispersed in water, in order to improve the dispersion effect, the clay slag can be firstly ground and then dispersed in water to form a clay slag dispersion system, or the clay slag can be mixed with water and then stirred and sheared to form a clay slag dispersion system with small particle size. Preferably, the clay soil particles in the clay soil dispersion system have a particle size of less than 80 μm.
In order to improve the production efficiency, the mass ratio of the white clay residues to the water in the white clay residue dispersion system is (0.9-1.1): 1.
preferably, the clay residue dispersion system and the oil well cement profile control and water plugging additive are uniformly mixed, and specifically the following steps are carried out: the clay residue dispersion system is uniformly mixed with a mixed solution formed by water, oil well cement and a profile control and water plugging auxiliary agent.
The mass ratio of the water in the mixed solution, the oil well cement and the profile control and water plugging auxiliary agent is 1: (0.6-1.1): (0.014 to 0.028). Further preferably, the profile control and water shutoff assistant is a suspending agent and a retarder. The mass ratio of the water, the oil well cement, the suspending agent and the retarder in the mixed solution is 1: (0.6-1.1): (0.006-0.008): (0.008-0.02).
Preferably, the mass ratio of the clay slag dispersion system to the mixed solution is 1: (1.2-1.4).
The preparation method of the invention is adopted to obtain the slurry of the profile control water shutoff agent, the slurry is injected into the stratum and then is solidified in the stratum, and the profile control water shutoff can be realized.
The method for resource utilization of the white clay residue adopts the technical scheme that:
a method for resource utilization of clay slag comprises the following steps: and injecting the water dispersion system consisting of the white clay residue, the oil well cement and the profile control and water plugging additive into the stratum, and realizing the profile control and water plugging of the oil field by utilizing the consolidation of the oil well cement and the white clay residue.
The clay slag is applied to profile control and water shutoff in oilfield exploitation, and can be directly used without being treated, so that effective resource utilization of the waste clay slag is realized, and the environment is protected.
Preferably, the mass ratio of the white clay residue to the oil well cement is 1: (1-1.5). Further preferably, the oil well cement is a grade G medium-resistant oil well cement.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention is further described with reference to the following specific embodiments.
The white clay residue used in the following examples is white clay residue produced in the production process of chemical industries, ltd, south Henan Yang, and the white clay residue mainly comprises inorganic oxides (the specific composition is shown in Table 1) and 20-30% of organic oil.
TABLE 1 main inorganic Components in the white soil slag
| Composition (I) | SiO2 | Al2O3 | MgO | Fe2O3 | CaO | H2O |
| Content (%) | 62～63 | 16～20 | 1～2 | 1～1.5 | 1～1.5 | 6～8 |
The reagents used in the following examples are not indicated by the manufacturer, and are all conventional products commercially available.
First, example of composition for Profile control and Water shutoff
Example 1
The composition for profile control and water shutoff in the embodiment comprises the following components in parts by weight: 20 parts of white clay residue, 25 parts of G-grade medium-resistant oil well cement, 0.25 part of sodium carboxymethyl cellulose and 0.4 part of sodium gluconate.
Example 2
The composition for profile control and water shutoff in the embodiment comprises the following components in parts by weight: 20 parts of white clay residue, 30 parts of G-grade medium-resistant oil well cement, 0.25 part of sodium carboxymethyl cellulose and 0.4 part of sodium gluconate.
Example 3
The composition for profile control and water shutoff in the embodiment comprises the following components in parts by weight: 22 parts of white clay residue, 28 parts of G-grade medium-resistant well cement, 0.2 part of hydroxyethyl cellulose and 0.5 part of molasses.
Example 4
The composition for profile control and water shutoff in the embodiment comprises the following components in parts by weight: 25 parts of white clay residue, 25 parts of G-grade medium-resistant oil well cement, 0.2 part of sodium carboxymethyl cellulose and 0.3 part of sodium gluconate.
Second, example of Profile control Water shutoff agent
Example 5
The profile control water shutoff agent of the embodiment comprises the following components in parts by weight: 20 parts of white clay residue, 22 parts of G-grade medium-resistant oil well cement, 0.25 part of sodium carboxymethyl cellulose, 0.3 part of sodium gluconate and 57.45 parts of water.
Example 6
The profile control water shutoff agent of the embodiment comprises the following components in parts by weight: 20 parts of white clay residue, 25 parts of G-grade medium-resistant oil well cement, 0.2 part of sodium carboxymethyl cellulose, 0.3 part of sodium gluconate and 54.5 parts of water.
Example 7
The profile control water shutoff agent of the embodiment comprises the following components in parts by weight: 25 parts of white clay residue, 25 parts of G-grade medium-resistant oil well cement, 0.2 part of hydroxyethyl cellulose, 0.5 part of molasses and 49.3 parts of water.
Example 8
The profile control water shutoff agent of the embodiment comprises the following components in parts by weight: 20 parts of white clay residue, 30 parts of G-grade medium-resistant oil well cement, 0.2 part of sodium carboxymethyl cellulose, 0.4 part of sodium gluconate and 49.4 parts of water.
Third, example of preparation method of profile control water shutoff agent
Example 9
The embodiment is a preparation method of the profile control water shutoff agent in embodiment 5, and specifically includes the following steps:
(1) mixing the white clay residue and water according to the weight ratio of 1: 1 proportion is added into a high-speed stirrer, and the mixture is fully stirred and sheared to form white clay residue slurry with the particle size of less than 80 mu m;
(2) mixing water, G-grade medium-resistant oil well cement, sodium carboxymethyl cellulose and sodium gluconate according to the weight ratio of 1: 0.6: 0.007: stirring and mixing the components according to the proportion of 0.008 to form a mixed solution;
(3) mixing the white clay residue slurry and the mixed solution in a proportion of 1: 1.3, stirring and mixing uniformly.
Example 10
The embodiment is a preparation method of the profile control water shutoff agent in embodiment 6, and specifically includes the following steps:
(1) mixing the white clay residue and water according to the weight ratio of 0.9: 1 proportion is added into a high-speed stirrer, and the mixture is fully stirred and sheared to form white clay residue slurry with the particle size of less than 80 mu m;
(2) mixing water, G-grade medium-resistant oil well cement, sodium carboxymethyl cellulose and sodium gluconate according to the weight ratio of 1: 0.8: 0.006: stirring and mixing the components in a ratio of 0.009 to form a mixed solution;
(3) mixing the white clay residue slurry and the mixed solution in a proportion of 1: 1.3, stirring and mixing uniformly.
Example 11
The embodiment is a preparation method of the profile control water shutoff agent in embodiment 7, and specifically includes the following steps:
(1) mixing the white clay residue and water according to the weight ratio of 1: 1 proportion is added into a high-speed stirrer, and the mixture is fully stirred and sheared to form white clay residue slurry with the particle size of less than 80 mu m;
(2) mixing water, G-level medium-resistant oil well cement, hydroxyethyl fiber and molasses according to the proportion of 1: 1.03: 0.008: stirring and mixing the components in a ratio of 0.02 to form a mixed solution;
(3) mixing the white clay residue slurry and the mixed solution in a proportion of 1: 1.3, stirring and mixing uniformly.
Example 12
The embodiment is a preparation method of the profile control water shutoff agent in embodiment 8, and specifically includes the following steps:
(1) mixing the white clay residue and water according to the weight ratio of 1: 1 proportion is added into a high-speed stirrer, and the mixture is fully stirred and sheared to form white clay residue slurry with the particle size of less than 80 mu m;
(2) mixing water, G-grade medium-resistant oil well cement, sodium carboxymethyl cellulose and sodium gluconate according to the weight ratio of 1: 1.02: 0.007: stirring and mixing the components according to the proportion of 0.008 to form a mixed solution;
(3) mixing the white clay residue slurry and the mixed solution in a proportion of 1: 1.3, stirring and mixing uniformly.
Fourth, a specific method for carrying out the method for recycling the clay soil is described in test example 3 and test example 4.
Fifth, test example section
Test example 1
The profile control water shutoff agent base fluid obtained by mixing the clay residue dispersion system slurry and the mixed solution in the example 6 is subjected to pH and density tests, and the specific determination method comprises the following steps: the pH value is measured by adopting pH test paper, and the density is measured by a cement paste density tester. And then curing the base fluid of the profile control water shutoff agent at the temperature of 40 ℃, and testing the compressive strength and the water precipitation rate of the obtained consolidation body, wherein the water precipitation rate is obtained by dividing the amount of free water on the surface of the consolidation body by the total volume, and the compressive strength is obtained by testing with a cement compressive strength testing machine. The test results are shown in table 2.
TABLE 2 basic Properties of base fluids for Water shutoff and Profile control Agents
| pH value | Density (g/L) | Compressive strength of consolidated body (MPa) | Water analysis rate (%) |
| 10 | 1.2 | 0.96 | 5.8％ |
Test example 2
The profile control water shutoff agent prepared in example 12 (i.e., the profile control water shutoff agent in example 8) was subjected to a water shutoff performance test, and the specific test method was: filling a core with sand in a sand filling pipe (with the radius of 2cm and the length of 13cm), performing water flooding at a certain displacement, and measuring the permeability K before plugging0And injecting a profile control water plugging agent, sealing two ends of the rock core, heating and curing, measuring the breakthrough pressure and the permeability K after plugging by water drive, and calculating the plugging efficiency and the breakthrough pressure gradient. The test results are shown in table 3.
TABLE 3 plugging Properties of Water shutoff Profile control Agents
As can be seen from Table 3, the profile control water shutoff agent has a good shutoff effect, the permeability of the core is reduced after shutoff, and the shutoff efficiency is as high as 99%; and has higher consolidation strength, and the breakthrough pressure gradient can reach 20 MPa/m.
Test example 3
Selecting a test well to carry out field performance test on the profile control water shutoff agent, wherein the temperature of a treatment layer of the test well is 23.6 ℃, the thickness of the treatment layer is 2m, and the permeability of the treatment layer is 4.59 mu m2In the past, there were 4 directions of steam blowby in the throughout development process. Due to the influence of a high permeable layer and steam channeling, the well has poor production effect, 680t steam is injected in an up-huff and puff turn, 129 days of production, 63t oil production, 94.6 percent of comprehensive water content and 0.09 of oil-gas ratio.
Aiming at the well condition, the profile control water shutoff agent is prepared from the following raw materials in parts by weight: 20 parts of white clay residue, 25 parts of G-grade medium-resistant oil well cement, 0.25 part of sodium carboxymethyl cellulose, 0.4 part of sodium gluconate and 54.35 parts of water. During on-site construction, the raw materials are mixed and injected into a test well. The specific mixing process of the raw materials comprises the following steps: (1) mixing the white clay residue and water according to the proportion of 1: 1, fully stirring and shearing to form a white clay residue slurry with the particle size of less than 80 mu m; (2) stirring and mixing the rest water, the G-grade anti-oil well cement, sodium carboxymethyl cellulose and sodium gluconate to form a mixed solution; (3) mixing the white clay residue slurry and the mixed solution in a proportion of 1: 1.3, the white clay residue slurry is pumped into the mixed liquid by a pump according to the proportion and is uniformly stirred.
The specific injection method comprises the following steps: the processing radius of the high permeability layer is 15m, the processing depth of the channeling channel is 30m, and the dosage of the profile control water shutoff agent is 430m3. The injection discharge capacity is 18-24 m3The injection pressure is 0-3.5 MPa. Then, the replacement water was injected into the tank for 10m3And stewing the well for 96 hours to ensure that the water shutoff agent is profile-adjusted and solidified.
And then steam is injected for 480t, the well is stewed, production is carried out according to a production system after the well stewing is finished, the production lasts for 123 days, oil extraction is carried out for 41.8t, the comprehensive water content is 96 percent, and the oil-steam ratio is 0.09.
Test example 4
Selecting a test well to carry out field performance test on the profile control water shutoff agent, wherein the temperature of a treatment layer of the test well is 23.8 ℃, the thickness of the treatment layer is 2.4m, and the permeability of the treatment layer is 5.39 mu m2There are 2 directions of steam channeling during the throughput development process. Due to the influence of a high permeable layer and steam channeling, the well has poor production effect, steam is injected for 484t in the last huff and puff turn, the production lasts for 127 days, the oil production lasts for 34t, the comprehensive water content is 95 percent, and the oil-gas ratio is 0.07.
Aiming at the well condition, the profile control water shutoff agent is prepared from the following raw materials in parts by weight: 20 parts of white clay residue, 30 parts of G-grade medium-resistant oil well cement, 0.25 part of sodium carboxymethyl cellulose, 0.4 part of sodium gluconate and 49.35 parts of water. During on-site construction, the raw materials are mixed and injected into a test well. The specific mixing process of the raw materials comprises the following steps: (1) mixing the white clay residue and water according to the proportion of 1: 1, fully stirring and shearing to form a white clay residue slurry with the particle size of less than 80 mu m; (2) stirring and mixing the rest water, the G-grade anti-oil well cement, sodium carboxymethyl cellulose and sodium gluconate to form a mixed solution; (3) mixing the white clay residue slurry and the mixed solution in a proportion of 1: 1.3, the white clay residue slurry is pumped into the mixed liquid by a pump according to the proportion and is uniformly stirred.
The specific injection method comprises the following steps: the processing radius of the high permeability layer is 10m, the processing depth of the channeling channel is 30m, and the dosage of the profile control water shutoff agent is 310m3. The injection discharge capacity is 12-20 m3The injection pressure is 0-4 MPa. Then, the replacement water was injected into the tank for 10m3And stewing the well for 96 hours to ensure that the water shutoff agent is profile-adjusted and solidified.
Then steam is injected for 480t, the well is stewed, production is carried out according to a production system after the well stewing is finished, the production lasts for 102 days, oil recovery is carried out for 49t, the comprehensive water content is 88 percent, and the oil-steam ratio is 0.1.
The field tests of the test example 3 and the test example 4 show that the oil recovery of the oil well is improved after the plugging is carried out by adopting the profile control water plugging agent. Further proves that the white clay residue can be directly used as a profile control water plugging agent without any treatment. Therefore, the invention provides a method for recycling the white clay residue, which has low cost and is suitable for popularization and application.
Claims (10)
1. The composition for profile control and water shutoff is characterized by comprising a profile control and water shutoff additive and the following components in parts by weight: 20-25 parts of clay slag and 20-30 parts of oil well cement.
2. A profile control and water shutoff composition according to claim 1, wherein the profile control and water shutoff auxiliary comprises 0.2 to 0.3 parts by weight of a suspending agent and 0.3 to 0.5 parts by weight of a retarder.
3. A profile control and water shutoff agent, which is characterized by comprising water and the composition for profile control and water shutoff according to any one of claims 1 to 2.
4. A method for preparing the profile control water shutoff agent according to claim 3, which comprises the following steps: the white clay residue is dispersed in water to form a white clay residue dispersion system; and then uniformly mixing the clay residue dispersion system with oil well cement and a profile control and water plugging auxiliary agent.
5. The method for preparing a profile control water shutoff agent according to claim 4, wherein the particle size of the kaolin particles in the kaolin dispersion system is less than 80 μm.
6. A preparation method of a profile control water shutoff agent according to claim 4 or 5, wherein the mass ratio of the white clay residue to the water in the white clay residue dispersion system is (0.9-1.1): 1.
7. the preparation method of the profile control water shutoff agent according to claim 4, wherein the uniform mixing of the clay residue dispersion system, the oil well cement and the profile control water shutoff auxiliary agent is as follows: the clay residue dispersion system is uniformly mixed with a mixed solution formed by water, oil well cement and a profile control and water plugging auxiliary agent.
8. The preparation method of the profile control water shutoff agent according to claim 7, wherein the mass ratio of the water in the mixed solution, the oil well cement and the profile control water shutoff auxiliary agent is 1: (0.6-1.1): (0.014 to 0.028).
9. The preparation method of the profile control water shutoff agent according to claim 7, wherein the mass ratio of the white clay residue dispersion system to the mixed solution is 1: (1.2-1.4).
10. A method for resource utilization of white clay residue is characterized in that a water dispersion system consisting of white clay residue, oil well cement and a profile control and water plugging auxiliary agent is injected into a stratum, and profile control and water plugging of an oil field are realized by consolidation of the oil well cement and the white clay residue.
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