CN111285642A - Plugging agent, preparation method and application thereof - Google Patents
Plugging agent, preparation method and application thereof Download PDFInfo
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- CN111285642A CN111285642A CN201811503519.6A CN201811503519A CN111285642A CN 111285642 A CN111285642 A CN 111285642A CN 201811503519 A CN201811503519 A CN 201811503519A CN 111285642 A CN111285642 A CN 111285642A
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- plugging agent
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- quartz sand
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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
-
- 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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/10—Coating or impregnating
- C04B20/1018—Coating or impregnating with organic materials
- C04B20/1029—Macromolecular compounds
- C04B20/1037—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
- C09K8/42—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
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00724—Uses not provided for elsewhere in C04B2111/00 in mining operations, e.g. for backfilling; in making tunnels or galleries
Abstract
The invention discloses a plugging agent, a preparation method and application thereof, and belongs to the technical field of oilfield plugging. The leaking stoppage agent provided by the embodiment of the invention comprises the following components in percentage by weight: 2 to 4 percent of consolidated quartz sand, 1 to 3 percent of coagulant, 3 to 5 percent of latex polymer, 3 to 5 percent of sheet material, 0.2 to 0.3 percent of fiber material, 23 to 29 percent of oil well cement and the balance of tap water. The solidifiable quartz sand is treated by thermosetting resin. The plugging agent has the advantages that the solidifiable quartz sand, the coagulant and the latex polymer are added and are cooperated with other components, so that the curing time of the plugging agent is shortened, and the curing strength of the plugging agent is improved. The plugging agent provided by the embodiment of the invention has the advantages of simple field preparation process, safe construction, short curing time and high consolidation strength, and the plugging agent is adopted for plugging, so that the success rate of plugging is high, and the economic loss caused by failure of plugging is reduced.
Description
Technical Field
The invention relates to a plugging agent, a preparation method and application thereof, and belongs to the technical field of oilfield plugging.
Background
The loose sandstone oil-water well is washed by water injection for a long time, a high-permeability zone or even a water flow large pore channel is formed in a stratum, and in addition, the stratum is loose, and when the water injection pressure is high, well leakage is often caused. After a well leak occurs, not only is the drilling fluid lost and the drilling time prolonged, but also the drilling fluid is lost and enters the stratum, and the stratum can be polluted. Therefore, after the well leakage occurs, well site workers need to timely stop the leakage layer.
The current commonly used plugging agent is mainly solid particle plugging agent. The solid particle plugging agent is mainly used for simply stacking various solid particles and plugging through the bridging effect among the solid particles.
However, the solid particle plugging agent has poor suspension property, long curing time and low consolidation strength, even does not consolidate, and can only temporarily plug a lost circulation layer. When high-pressure operation is carried out at the later stage, the plugging agent has low compressive strength and is easy to be dispersed, so that plugging failure is caused, and the plugging success rate is low.
Disclosure of Invention
The embodiment of the invention provides a plugging agent, a preparation method and application thereof, which can solve the problems of improving the strength of a leakage layer and improving the success rate of plugging. The technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a plugging agent, which includes the following components by weight:
2-4% of consolidated quartz sand, 1-3% of coagulant, 3-5% of latex polymer, 3-5% of sheet material, 0.2-0.3% of fiber material, 23-29% of oil well cement and the balance of tap water;
the solidifiable quartz sand is treated by thermosetting resin.
In one possible implementation, the thermosetting resin is at least one of an epoxy resin, a phenolic resin, and an unsaturated polyester.
In one possible implementation, the set accelerator is at least one of calcium chloride and triethanolamine.
In one possible implementation, the latex polymer is a carboxylated styrene-butadiene latex polymer.
In one possible implementation, the flake material is at least one of mica and wood chips.
In one possible implementation, the fiber material is polypropylene fiber.
In a possible implementation manner, the particle size of the consolidated quartz sand ranges from 0.3 mm to 0.7 mm.
In a second aspect, an embodiment of the present invention provides a preparation method of a plugging agent, where the preparation method includes:
adding tap water into the stirring tank according to the weight percentage of each component;
adding a latex polymer into the stirring tank, and uniformly stirring;
adding fiber materials into the stirring tank, and uniformly stirring;
and sequentially adding oil well cement, consolidated quartz sand, a flaky material and a coagulant into the stirring tank, and uniformly stirring and mixing to obtain the plugging agent.
In a third aspect, the embodiment of the invention provides an application of a plugging agent in plugging in the development process of an oil-water well.
The technical scheme provided by the embodiment of the invention has the following beneficial effects:
the plugging agent provided by the embodiment of the invention is beneficial to consolidation of the plugging agent in a well by adding the consolidated quartz sand into tap water and cooperatively matching with other components. By adding the coagulant and cooperating with other components, the curing time of the plugging agent is shortened, so that the plugging agent is rapidly cured under the action of the coagulant. By adding the latex polymer, the dispersibility of each component in the plugging agent is enhanced, so that the plugging agent is in uniform slurry, the good injection performance of the plugging agent is ensured, and the curing time of the plugging agent is favorably shortened. By adding the flaky material, the fiber material and the oil well cement and matching with other components, the plugging agent has good suspension property, and can quickly bridge in a leakage layer, thereby being beneficial to the retention of the plugging agent in the leakage layer. The plugging agent has the advantages of simple field preparation process, safe construction, short curing time and high consolidation strength, and the plugging agent is adopted for plugging, so that the success rate of plugging is high, and the economic loss caused by failure of plugging is reduced.
Detailed Description
In order to make the technical solutions and advantages of the present invention clearer, the following describes embodiments of the present invention in further detail.
In a first aspect, an embodiment of the present invention provides a plugging agent, which includes the following components by weight:
2-4% of consolidated quartz sand, 1-3% of coagulant, 3-5% of latex polymer, 3-5% of sheet material, 0.2-0.3% of fiber material, 23-29% of oil well cement and the balance of tap water;
the solidifiable quartz sand is treated by thermosetting resin.
The plugging agent provided by the embodiment of the invention is beneficial to consolidation of the plugging agent in a well by adding the consolidated quartz sand into tap water and cooperatively matching with other components. By adding the coagulant and cooperating with other components, the curing time of the plugging agent is shortened, so that the plugging agent is rapidly cured under the action of the coagulant. By adding the latex polymer, the dispersibility of each component in the plugging agent is enhanced, so that the plugging agent is in uniform slurry, the good injection performance of the plugging agent is ensured, and the curing time of the plugging agent is favorably shortened. By adding the flaky material, the fiber material and the oil well cement and matching with other components, the plugging agent has good suspension property, and can quickly bridge in a leakage layer, thereby being beneficial to the retention of the plugging agent in the leakage layer. The plugging agent has the advantages of simple field preparation process, safe construction, short curing time and high consolidation strength, and the plugging agent is adopted for plugging, so that the success rate of plugging is high, and the economic loss caused by failure of plugging is reduced.
In embodiments of the present invention, the weight percentage of the consolidable silica sand may be 23%, 23.8%, 24%, 24.5%, 25%, 26%, 27%, 28%, 29%, etc. The weight percentage of accelerator may be 1%, 1.5%, 1.6%, 2%, 2.5%, 3%, etc. The weight percent of latex polymer may be 3%, 3.3%, 3.5%, 4%, 4.5%, 5%, etc. The weight percentage of the sheet material may be 3%, 3.5%, 4%, 4.5%, 4.8%, 5%, etc. The weight percentage of the fibrous material may be 0.2%, 0.22%, 0.24%, 0.26%, 0.28%, 0.3%, etc. The weight percent of oil well cement may be 23%, 23.5%, 23.8%, 24%, 24.5%, 25%, 26%, 27%, 28%, 29%, etc. The weight percentage of water may be 60%, 61%, 61.5%, 62%, 62.5%, 63%, 63.5%, 64%, 65%, etc.
In one possible implementation, the thermosetting resin is at least one of an epoxy resin, a phenolic resin, and an unsaturated polyester. In the embodiment of the present invention, the kind of the thermosetting resin is not particularly limited. Preferably, the thermosetting resin is an epoxy resin. The quartz sand itself cannot be consolidated, but in the embodiment of the invention, the quartz sand is treated by thermosetting resin, and a thermosetting resin coating is formed on the outer surface of the quartz sand, so that the consolidated quartz sand is obtained. The concretionable quartz sand is beneficial to concretionary of the plugging agent in the well and improves the solidification strength of the plugging agent. And the quartz sand with the grain diameter of 0.3-0.7 mm is favorable for the plugging agent to bridge in the leakage layer quickly, and is favorable for the plugging agent to stay in the leakage layer.
The thermosetting resin is chemically changed by heating, gradually hardened and molded, and hardly deformed by pressure.
In one possible implementation, the set accelerator is at least one of calcium chloride and triethanolamine. The coagulant can effectively shorten the curing time of the plugging agent, so that the plugging agent is rapidly cured under the action of the coagulant. In the embodiment of the present invention, the kind of the accelerator is not particularly limited. For example, the setting accelerator may be an inorganic salt type setting accelerator, such as calcium chloride; or an organic compound coagulant such as triethanolamine. Preferably, the coagulant is calcium chloride.
In one possible implementation, the latex polymer is a carboxylated styrene-butadiene latex polymer, and the content of the carboxylated styrene-butadiene latex in the latex polymer is 50-60%. The latex polymer is an emulsion polymer with viscosity and solidification capability, can suspend solid particle materials in the plugging agent, and can be solidified. And the selected carboxylic styrene-butadiene latex polymer can enhance the dispersibility of each component in the plugging agent, so that the plugging agent is in uniform slurry, and the good injection performance of the plugging agent is ensured. And the carboxyl in the carboxylated styrene-butadiene latex polymer can increase the polarity of the latex polymer and improve the adsorption force and the adhesive property of the latex polymer.
In one possible implementation, the flake material is at least one of mica and wood chips. In the embodiment of the present invention, the kind of the sheet-like material is not particularly limited. For example, the plate-like material is mica.
In one possible implementation, the fibrous material is polypropylene fibers.
In one possible implementation, the oil well cement used in the embodiments of the present invention is oil well cement modified by a special particle size processing. The oil well cement is special cement for well cementation engineering of oil wells, gas wells and the like, has certain fluidity in the well injection process, and can be solidified and coagulated in a short time after being injected into a well; the cured oil well cement has good stability and impermeability.
Wherein the mica is of a laminated structure, the polypropylene fiber is fibrous, the oil well cement and the concretable quartz sand are both particles, the particle size of the mica is less than 1mm, the fiber diameter of the polypropylene fiber is between 1 and 6mm, the average particle size of the oil well cement is 7 to 15 mu m, and the particle size range of the concretable quartz sand is 0.3 to 0.7 mm. The different shape characteristics of mica, polypropylene fiber, oil well cement and concretionable quartz sand can be utilized to realize the staggered filling and enhance the plugging effect. The mica and the polypropylene fiber can be connected and bridged in the large holes to form a space net structure, and the oil well cement and the solidifiable quartz sand can be filtered and filled in the small holes formed after bridging, so that the effective plugging of a leakage layer is realized.
In a second aspect, an embodiment of the present invention provides a preparation method of the above plugging agent, where the preparation method includes:
step 1: according to the weight percentage of each component, tap water is added into the stirring tank.
The weight percentages of the components are respectively 2-4% of concretionable quartz sand, 1-3% of coagulant, 3-5% of latex polymer, 3-5% of sheet material, 0.2-0.3% of fiber material, 23-29% of oil well cement and the balance of tap water. According to the weight percentage of the components, tap water with certain weight percentage is added into the stirring tank.
Step 2: the latex polymer was added to the stirred tank and stirred well.
The specific process of the step is as follows: adding 23-29 wt% of latex polymer into a stirring tank with tap water, and uniformly stirring.
Wherein, the stirring time can be set and changed according to the requirement. In the examples of the present invention, the stirring time is not particularly limited. For example, the time of stirring may be 30min, 40min, or 50 min. Preferably, the stirring time is 40 min.
And step 3: adding fiber materials into the stirring tank, and uniformly stirring.
Adding 0.2 to 0.3 weight percent of fiber material into a stirring tank with tap water and latex polymer, and stirring uniformly.
And 4, step 4: and sequentially adding oil well cement, consolidated quartz sand, a flaky material and a coagulant into the stirring tank, and uniformly stirring and mixing to obtain the plugging agent.
23-29 percent of oil well cement, 2-4 percent of solidifiable quartz sand, 3-5 percent of sheet material and 1-3 percent of coagulant are sequentially added into a stirring tank added with tap water, latex polymer and fiber material, and the plugging agent is obtained by stirring and mixing uniformly.
The preparation method of the plugging agent is simple and easy to operate, and the field preparation process is simple.
The technical solution of the present invention will be described in detail by specific examples below.
Example 1
The embodiment provides a plugging agent, which is prepared by the following method:
adding 600 g of tap water into a stirring tank; adding 30 g of latex polymer into a stirring tank, and uniformly stirring; adding 3 g of fiber material into a stirring tank, and uniformly stirring; 290 g of oil well cement, 22 g of consolidated quartz sand, 30 g of sheet material and 25 g of coagulant are added into a stirring tank in sequence, and the mixture is stirred and mixed uniformly to obtain the plugging agent provided by the embodiment.
Example 2
The embodiment provides a plugging agent, which is prepared by the following method:
adding 610 g of tap water into a stirring tank; adding 34 g of latex polymer into a stirring tank, and uniformly stirring; adding 3 g of fiber material into a stirring tank, and uniformly stirring; 273 g of oil well cement, 20 g of consolidated quartz sand, 30 g of flaky materials and 30 g of coagulant are sequentially added into a stirring tank, and the mixture is stirred and mixed uniformly to obtain the plugging agent provided by the embodiment.
Example 3
The embodiment provides a plugging agent, which is prepared by the following method:
adding 620 g of tap water into a stirring tank; adding 46 g of latex polymer into a stirring tank, and uniformly stirring; adding 2 g of fiber material into a stirring tank, and uniformly stirring; 252 g of oil well cement, 40 g of consolidated quartz sand, 30 g of sheet material and 10 g of coagulant are sequentially added into a stirring tank, and the mixture is stirred and mixed uniformly to obtain the plugging agent provided by the embodiment.
Example 4
The embodiment provides a plugging agent, which is prepared by the following method:
adding 615 g of tap water into a stirring tank; adding 50 g of latex polymer into a stirring tank, and uniformly stirring; adding 2 g of fiber material into a stirring tank, and uniformly stirring; 238 g of oil well cement, 25 g of consolidated quartz sand, 50 g of sheet material and 20 g of coagulant are sequentially added into a stirring tank, and stirred and mixed uniformly to obtain the plugging agent provided by the embodiment.
Example 5
The embodiment provides a plugging agent, which is prepared by the following method:
adding 650 g of tap water into a stirring tank; adding 37 g of latex polymer into a stirring tank, and uniformly stirring; adding 2 g of fiber material into a stirring tank, and uniformly stirring; 230 g of oil well cement, 20 g of consolidated quartz sand, 45 g of sheet material and 16 g of coagulant are sequentially added into a stirring tank, and stirred and mixed uniformly to obtain the plugging agent provided by the embodiment.
Application example 1
The application example evaluates the suspension performance of the plugging agent provided in examples 1 to 5. The specific evaluation process comprises the following steps: 100mL of the plugging agent provided in the embodiments 1-5 are respectively poured into 5 identical measuring cylinders of 100mL, and after standing for 30 minutes at normal temperature, the amount of water precipitated from the upper part of each measuring cylinder is accurately read, and the specific test data are shown in Table 1.
TABLE 1
| Plugging agent | Water separating amount, mL |
| Example 1 | 3.9 |
| Example 2 | 4.2 |
| Example 3 | 5.4 |
| Example 4 | 4.8 |
| Example 5 | 5.9 |
As can be seen from table 1: after the 100mL of plugging agent provided by the embodiments 1-5 is stood for 30 minutes, the maximum water precipitation amount is not more than 6mL, which shows that the plugging agent provided by the embodiments 1-5 has no obvious layering phenomenon and good suspension performance.
Application example 2
The application examples evaluate the curing time of the plugging agent provided in examples 1 to 5. The specific evaluation process comprises the following steps: the same amount of the plugging agent provided in examples 1 to 5 was taken, stirred uniformly, poured into 5 colorimetric tubes of the same size, placed in a thermostatic water bath at 50 ℃, observed at regular intervals, and the curing time of the plugging agent provided in each example was recorded accurately. Specific test data are shown in table 2.
TABLE 2
| Plugging agent | Curing time, h |
| Example 1 | 8.1 |
| Example 2 | 8.4 |
| Example 3 | 9.3 |
| Example 4 | 10.0 |
| Example 5 | 9.8 |
As can be seen from table 2: the shortest curing time of the plugging agent provided by the embodiments 1 to 5 is 8.1 hours, and the longest curing time is not more than 10 hours, which shows that the plugging agent provided by the embodiments 1 to 5 has shorter curing time, can be cured quickly, and can meet the requirements of site construction on the curing time of the plugging agent.
Application example 3
The application examples evaluate the curing strength of the plugging agent provided in examples 1 to 5. The specific evaluation process comprises the following steps: the same amount of the plugging agent provided in examples 1-5 was respectively taken, stirred uniformly, poured into 5 beakers with the same diameter of 100mm, and all the 5 beakers were placed in a constant temperature water bath at 50 ℃ for 20 hours. The curing strength of the plugging agent provided in examples 1 to 5 was measured by a compressive strength tester. Specific test data are shown in table 3.
TABLE 3
| Plugging agent | Curing strength, MPa |
| Example 1 | 6.7 |
| Example 2 | 6.3 |
| Example 3 | 6.1 |
| Example 4 | 5.6 |
| Example 5 | 5.1 |
As can be seen from table 3: the curing strength of the plugging agent provided in the embodiments 1 to 5 can reach 6.7MPa, which is close to 7 MPa. The curing strength of the plugging agent provided in examples 1 to 5 is measured, which shows that the prepared plugging agent has high curing strength and can meet the construction requirement of plugging.
Application example 4
The application example evaluates the plugging efficiency of the plugging agent provided in the examples 1 to 5 in a leakage evaluation instrument. The specific evaluation process comprises the following steps: a certain amount of 20-40-mesh quartz sand is added into the leakage evaluation instrument to simulate a leakage layer. The plugging agent provided in example 1 was added to the leak evaluation instrument with the quartz sand, pressurized at 5MPa, and the plugging efficiency of the leak evaluation instrument at different times after the addition of the plugging agent provided in example 1 was measured at regular intervals.
TABLE 4
The plugging efficiency of the plugging agent provided in examples 2 to 5 was sequentially measured at different times. Specific test data are shown in table 4.
As can be seen from table 4: the plugging efficiency of the plugging agent provided by the embodiments 1 to 5 is continuously increased along with the time. And at 30min, the plugging efficiency of the plugging agents provided in the embodiments 1 to 5 is over 93%, even up to 96.7%, which shows that the plugging agents provided in the embodiments 1 to 5 have high plugging efficiency and strong plugging capability.
Application example 5
The application example evaluates the plugging efficiency of the plugging agent provided in the examples 1-5 in the artificial core. The specific evaluation process comprises the following steps: and 5 identical artificial rock cores are manufactured, wherein the artificial rock cores are quartz sand epoxy resin cemented artificial rock cores, and seepage channels in the stratum are simulated through the artificial rock cores. The length, the width and the height of each artificial core are respectively 15cm, 4.5cm and 4.5cm, a hole is drilled along the length direction of the core, the hole diameter is 1.6cm, the hole depth is 6cm, and quartz sand with the particle size of 35-40 meshes is added into the hole of the artificial core. Adding a certain volume of clear water into the artificial core added with the quartz sand, and measuring the first permeability K of the artificial core before adding the plugging agent provided in the example 11. Adding the plugging agent provided in the embodiment 1 into the artificial core added with the quartz sand, wherein the volume of the added plugging agent is the same as that of clear water, and measuring the second permeability K of the artificial core after the plugging agent is added2. Through the first permeability K1And a second permeability K2The plugging efficiency of the plugging agent provided in example 1 was determined η.
The calculation formula of the leakage stoppage efficiency is as follows:
wherein, K1Is a first permeability, K2For the second permeability, η is the plugging efficiency.
TABLE 5
The plugging efficiency of the plugging agent provided in examples 2-5 in the artificial core was sequentially measured. Specific test data are shown in table 5.
As can be seen from table 5: the plugging efficiency of the plugging agents provided in the embodiments 1 to 5 in the artificial core is more than 90%, and the plugging agents provided in the embodiments 1 to 5 are high in plugging efficiency and strong in plugging capability.
Application example 6
The application example evaluates the application of the plugging agent provided in example 1 in the field.
In a certain water well of an oil field in the large harbor western region, the well begins to inject polymer solution 12 months in 2014, but serious channeling occurs with a corresponding oil well, and the polymer solution mainly flows into the oil well through a channeling channel, so that the polymer solution cannot be normally injected. And the polymer concentration measured in the oil well reaches 1068mg/l, and a cross flow channel between the oil well and the water well is developed, so that the plugging cannot be successfully completed by adopting the conventional plugging agent. In 2016, the channeling channel is plugged by adopting the plugging agent provided by the embodiment 1, and the dosage of the plugging agent is 13m3The highest construction pressure is 9 MPa. After the measures, the water well can normally inject the polymer, and the phenomenon of channeling and gathering of the corresponding oil well does not occur.
Application example 7
The application example evaluates the application of the plugging agent provided in example 1 in the field.
The daily yield of a certain oil well of a Sanmu oil field of a Dagang sheep at the initial stage of production is 42.3 tons, wherein the water content is 87 percent, and the daily oil yield is 5.5 tons. However, by 7 months in 2016, the daily yield is 190 tons, but the water content is as high as 98.3%, and the daily oil yield is reduced to 3.23 tons. The reason is analyzed: the physical property of the oil well is better, the bottom layer of the oil well is washed by formation water for a long time, so that the formation is loosened, the permeability of the oil well is increased, even water flow large channels are formed, and more residual oil exists in the upper layer of the oil well. Since the mobility of water is greater than that of oil, water is mainly produced during oil recovery. Therefore, the bottom layer of the oil well needs to be plugged, in order to ensure the plugging efficiency, the oil well is plugged by the plugging agent provided in example 1 in 1 month in 2017, and the dosage of the plugging agent is 90m3The highest construction pressure is 10MPa, after plugging, the daily yield is 20.35 tons, the water content is reduced to 77.4 percent, and the daily oil yield is increased to 4.6 tons. By 12 months in 2018, compared with before pluggingAdding 820t of crude oil and 100m of water yield3。
In conclusion, the plugging agent provided by the embodiment of the invention can be quickly cured, has short curing time and high consolidation strength, and can effectively plug a leakage layer, thereby meeting the plugging requirement.
The above description is only for facilitating the understanding of the technical solutions of the present invention by those skilled in the art, and is not intended to limit the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The plugging agent is characterized by comprising the following components in percentage by weight:
2-4% of consolidated quartz sand, 1-3% of coagulant, 3-5% of latex polymer, 3-5% of sheet material, 0.2-0.3% of fiber material, 23-29% of oil well cement and the balance of tap water;
the solidifiable quartz sand is treated by thermosetting resin.
2. Lost circulation additive of claim 1 wherein the thermosetting resin is at least one of epoxy, phenolic and unsaturated polyester.
3. Lost circulation additive according to claim 1, wherein the coagulant is at least one of calcium chloride and triethanolamine.
4. The plugging agent of claim 1, wherein the latex polymer is a carboxylated styrene-butadiene latex polymer.
5. The plugging agent of claim 1, wherein the sheet material is at least one of mica and wood chips.
6. Lost circulation additive of claim 1 wherein the fibrous material is polypropylene fibers.
7. The plugging agent according to claim 1, wherein the particle size range of the consolidated quartz sand is 0.3-0.7 mm.
8. A preparation method of the plugging agent as claimed in any one of claims 1 to 7, characterized in that the preparation method comprises:
adding tap water into the stirring tank according to the weight percentage of each component;
adding a latex polymer into the stirring tank, and uniformly stirring;
adding fiber materials into the stirring tank, and uniformly stirring;
and sequentially adding oil well cement, consolidated quartz sand, a flaky material and a coagulant into the stirring tank, and uniformly stirring and mixing to obtain the plugging agent.
9. The use of the plugging agent of any one of claims 1 to 7 for plugging in the development process of oil-water wells.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116023086A (en) * | 2021-10-26 | 2023-04-28 | 中国石油天然气集团有限公司 | Thermosetting resin gel plugging composition and preparation method thereof |
| CN115322758A (en) * | 2022-08-30 | 2022-11-11 | 新疆格瑞迪斯石油技术股份有限公司 | High-temperature and high-pressure resistant drilling fluid plugging agent |
| CN115322758B (en) * | 2022-08-30 | 2023-09-12 | 新疆格瑞迪斯石油技术股份有限公司 | High-temperature and high-pressure resistant drilling fluid plugging agent |
| CN116333702A (en) * | 2023-05-23 | 2023-06-27 | 奥联图(西安)能源有限公司 | Thixotropic plugging agent and plugging method and preparation method |
| CN116333702B (en) * | 2023-05-23 | 2023-08-22 | 奥联图(西安)能源有限公司 | Thixotropic plugging agent and plugging method and preparation method |
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