CN114437686A - High-temperature-resistant high-salt-resistant chemical bridge plug composition for well bore, gel thereof, preparation method and application - Google Patents
High-temperature-resistant high-salt-resistant chemical bridge plug composition for well bore, gel thereof, preparation method and application Download PDFInfo
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- CN114437686A CN114437686A CN202011124709.4A CN202011124709A CN114437686A CN 114437686 A CN114437686 A CN 114437686A CN 202011124709 A CN202011124709 A CN 202011124709A CN 114437686 A CN114437686 A CN 114437686A
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- 239000003999 initiator Substances 0.000 claims abstract description 25
- DZSVIVLGBJKQAP-UHFFFAOYSA-N 1-(2-methyl-5-propan-2-ylcyclohex-2-en-1-yl)propan-1-one Chemical group CCC(=O)C1CC(C(C)C)CC=C1C DZSVIVLGBJKQAP-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000011161 development Methods 0.000 claims abstract description 4
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- XHZPRMZZQOIPDS-UHFFFAOYSA-N 2-Methyl-2-[(1-oxo-2-propenyl)amino]-1-propanesulfonic acid Chemical compound OS(=O)(=O)CC(C)(C)NC(=O)C=C XHZPRMZZQOIPDS-UHFFFAOYSA-N 0.000 claims abstract description 3
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- 238000000034 method Methods 0.000 claims description 9
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 7
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- JRKICGRDRMAZLK-UHFFFAOYSA-L peroxydisulfate Chemical compound [O-]S(=O)(=O)OOS([O-])(=O)=O JRKICGRDRMAZLK-UHFFFAOYSA-L 0.000 claims description 3
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/512—Compositions based on water or polar solvents containing organic compounds macromolecular compounds containing cross-linking agents
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/504—Compositions based on water or polar solvents
- C09K8/506—Compositions based on water or polar solvents containing organic compounds
- C09K8/508—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/5083—Compositions based on water or polar solvents containing organic compounds macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
- C09K8/50—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls
- C09K8/516—Compositions for plastering borehole walls, i.e. compositions for temporary consolidation of borehole walls characterised by their form or by the form of their components, e.g. encapsulated material
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/13—Methods or devices for cementing, for plugging holes, crevices or the like
- E21B33/134—Bridging plugs
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- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
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- Environmental & Geological Engineering (AREA)
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Abstract
The invention discloses a high-temperature and high-salt resistant chemical bridge plug composition for a shaft, a gel, a preparation method and application thereof, and belongs to the technical field of oil and gas field development. The chemical bridge plug composition comprises: acrylamide, modified monomer, organic cross-linking agent, polyacrylamide and initiator; the modified monomer is selected from 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and butyl acrylate; 2-acrylamido-2-methylpropanesulfonic acid is preferred. The chemical bridge plug gel which is synergistically generated by the double reactions of crosslinking reaction and polymerization reaction between the compositions after water is added through reasonable proportion has the advantages of high strength, controllable gelling time and good temperature resistance.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development, and particularly relates to a high-temperature and high-salt resistant chemical bridge plug composition for a shaft, a gel of the composition, a preparation method of the gel and application of the gel.
Background
With the exploitation of oil field, due to the influence of factors such as well cementation, oil extraction, well structure and casing corrosion, the phenomena of perforation, deformation, damage and the like appear on the free section and the sealed section of the casing of partial oil wells and water wells, which causes the problems of non-target oil layer leakage and water outlet and seriously influences the normal production of the oil-water wells. Currently, methods of plugging include mechanical plugging and chemical plugging. The mechanical plugging is performed by using a packer, the packer has short validity period, insufficient high-temperature and high-pressure resistance and limited applicable position, and water bypasses the packer to enter an oil well again, so that the construction requirement cannot be met. Common chemical gel plugging agents include cement plugging, resin type temporary plugging chemical bridge plugs, gel type temporary plugging chemical bridge plugs, and the like. The cement plugging agent has high strength after plugging, but has high density, so that a well with high leakage amount cannot be plugged effectively. The resin type temporary plugging chemical bridge plug has poor injectability, easy slippage phenomenon, short gelling time and high risk. The existing gel type temporary plugging chemical bridge plug has poor temperature resistance, salt resistance, flushing resistance and plugging effect.
The Tahe oil field belongs to a fracture-cavity type oil reservoir, the fracture-cavity is developed, the heterogeneity is strong, the oil reservoir condition is harsh, and the adaptability of a conventional medicament system is poor. Bulk zone temperature (130 ℃), high formation water mineralization (22 × 10)4mg/L), calcium and magnesium ion concentration of 1.0X 104mg/L。
In summary, a method for developing a refractory (130 ℃) and hypersalinity (22X 10) without limitation of applicable position is developed4mg/L), is resistant to saline washing, is easy to unseal, and has low price, thus becoming a problem to be solved in the field.
Disclosure of Invention
In order to solve the above problems of the prior art, the present invention provides a high temperature and high salt resistant chemical bridge plug gel for a wellbore.
The technical scheme of the invention is as follows:
a high temperature, high salt resistant chemical bridge plug composition for use in a wellbore, comprising: acrylamide, modified monomer, organic cross-linking agent, polyacrylamide and initiator;
the modified monomer is selected from 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and butyl acrylate; 2-acrylamido-2-methylpropanesulfonic acid is preferred.
Acrylamide, as one of the main agents of the chemical bridge plug composition of the present invention, functions as: and (3) carrying out polymer reaction under the action of an initiator so as to form polyacrylamide gel. Part of acrylamide can react with calcium and magnesium ions in water, so that the influence of the calcium and magnesium ions on the gelling effect of the gel is reduced.
Modifying monomers: 2-acrylamide-2-methylpropanesulfonic Acid (AMPS) is used, and the temperature resistance and salt tolerance of a polymer gel product finally prepared from the chemical bridge plug composition can be improved by using the AMPS.
Organic crosslinking agent: the organic cross-linking agent is a phenolic resin type cross-linking agent, and mainly has the function of performing dehydration condensation reaction with amide groups on polyacrylamide, so that the cross-linked polyacrylamide forms a three-dimensional network structure and macroscopically forms a gel structure.
The polyacrylamide is a component which plays a determining role in the cross-linking reaction in the chemical bridge plug composition, although the acrylamide can generate the polyacrylamide gel through the polymerization reaction under the action of the initiator, a small amount of polyacrylamide needs to be added in the composition in advance, the polyacrylamide can be preferentially cross-linked with the cross-linking agent, the condition that the polymerization reaction of the acrylamide is influenced by the fact that all the cross-linking agent is directly cross-linked with a large amount of acrylamide to generate the polyacrylamide is prevented, and the polyacrylamide is cross-linked with the rest of the cross-linking agent after the acrylamide is formed through the polymerization reaction under the action of the initiator, so that the generated gel has high strength, high temperature resistance and excellent performance.
The initiator mainly plays a role in initiating polymerization of acrylamide and AMPS monomers, and polyacrylamide can be formed after polymerization.
The mass ratio of the acrylamide to the modified monomer, the organic cross-linking agent, the polyacrylamide to the initiator is 15-25: 0.4-0.8: 0.2-0.4: 0.06;
preferably, the acrylamide and the modifying monomer refer to a solid mixture of the acrylamide and the modifying monomer.
The mass ratio of the acrylamide to the modified monomer is 8-10: 1, preferably 9: 1.
Experimental screening confirms that the final bridge plug product prepared by adopting the proportion has the best temperature resistance and salt tolerance. The AMPS has too high proportion, which causes the system not to be easily polymerized and the strength not to meet the requirement, and the AMPS has too low proportion, poor temperature resistance and salt tolerance of the system and easy degradation and melting after high temperature.
The organic cross-linking agent is selected from the group consisting of phenolic resin, sulfonated phenolic resin, N-methylene bisacrylamide.
Preferably, the molecular weight of the polyacrylamide is 600-700 ten thousand, the hydrolysis degree is 5-10%, and the solid content is 90%;
polyacrylamide is a common raw material and can be obtained commercially, but different molecular weights, different degrees of hydrolysis and different solid contents have an influence on the final performance of the gel product finally prepared from the polyacrylamide, and the gel product can be obtained by using the polyacrylamide with the molecular weights, the degrees of hydrolysis and the solid contents as the raw material.
Preferably, the initiator comprises a persulfate or an azo organic compound.
The high-temperature and high-salt resistant chemical bridge plug gel for the well bore is characterized by comprising the high-temperature and high-salt resistant chemical bridge plug composition for the well bore and water.
The high-temperature and high-salt resistant chemical bridge plug gel for the wellbore comprises: 15-25% of acrylamide and modified monomer by mass, 0.4-0.8% of organic cross-linking agent by mass, 0.2-0.4% of polyacrylamide by mass, 0.06% of initiator by mass, and the balance of water; the sum of the mass percentages of acrylamide, modified monomer, organic cross-linking agent, polyacrylamide, initiator and water is 100%.
The water can be selected from tap water and can also be distilled water, the effect of the distilled water is better, but the distilled water is inconvenient for on-site practical application, and the tap water used in a construction site is mainly because the tap water is relatively better obtained.
The greatest innovation of the invention is that the gel is prepared by using a polyacrylamide crosslinking and acrylamide monomer polymerization double method. The conventional polyacrylamide cross-linked gel has low strength and cannot reach the high strength required in the field actual production. The gel formed by polymerizing the acrylamide monomer has high gelling speed and is easy to degrade and melt after being heated for a long time. Therefore, the gel prepared by the two methods has the advantages of high strength, controllable gelling time and good temperature resistance.
The preparation method of the high-temperature and high-salt resistant chemical bridge plug gel for the shaft is characterized in that the gel is obtained by adding polyacrylamide, an organic cross-linking agent and an initiator into an aqueous solution of acrylamide and a modified monomer.
The polyacrylamide, the organic cross-linking agent and the initiator are added in sequence.
The polyacrylamide is added firstly to prevent the polymer from instantly caking and being incapable of effectively dissolving in water.
The high-temperature and high-salt resistant chemical bridge plug composition for the well bore, and/or the high-temperature and high-salt resistant chemical bridge plug gel for the well bore, which is prepared by the preparation method, is applied to the aspect of oil and gas development.
The chemical bridge plug gel is suitable for a shaft and an open hole section at the temperature of 80-140 ℃;
preferably, the chemical bridge plug gel is injected into a wellbore.
The high-temperature-resistant chemical bridge plug gel for the shaft consists of polymerization monomers (acrylamide and 2-acrylamide-2-methylpropanesulfonic acid) and a polymer (polyacrylamide), wherein the polymerization reaction and the crosslinking reaction are carried out simultaneously, and the polymerization reaction refers to the polymerization reaction of the acrylamide and the 2-acrylamide-2-methylpropanesulfonic acid and the polymerization reaction between the acrylamide and the 2-acrylamide-2-methylpropanesulfonic acid to form the polyacrylamide; the crosslinking reaction refers to the crosslinking reaction between polyacrylamide generated by polymerization reaction and originally added polyacrylamide and an organic crosslinking agent; the polyacrylamide which was added initially undergoes a crosslinking reaction with the organic crosslinking agent, and at the same time the polymerization of acrylamide and AMPS proceeds. The chemical bridge plug gel comprises, by mass, 100% of the total mass of the chemical bridge plug gel, 15-25% of acrylamide and a modified monomer, wherein the monomer proportion is 9:1, 0.4-0.8% of an organic cross-linking agent, 0.2-04% of polyacrylamide, 0.06% of an initiator and the balance of tap water, and the sum of the mass percentages of the raw materials of the chemical bridge plug gel is 100%;
the gel can be formed by polymerization reaction or crosslinking reaction, but the greatest innovation of the invention is that the chemical bridge plug gel with high strength, high temperature and high salt resistance and excellent performance is obtained by adopting reasonable raw material collocation and dosage proportion to ensure that the double reactions of polyacrylamide crosslinking and acrylamide monomer polymerization are generated between the compositions after water is added. The conventional polyacrylamide cross-linked gel has low strength and cannot reach the high strength required in the field actual production. The gel formed by polymerizing the acrylamide monomer has high gelling speed and is easy to degrade and melt after being heated for a long time. The gel prepared by the invention through the synergistic reaction of the crosslinking reaction and the polymerization reaction has the advantages of high strength, controllable gelling time and good temperature resistance.
The cross-linking reaction preferentially occurs between the polyacrylamide and the cross-linking agent, and if the polyacrylamide is not added, the cross-linking agent can be directly cross-linked with the acrylamide and cannot meet the requirement, so that the polyacrylamide is added to be cross-linked in preference to the cross-linking agent, and then is cross-linked with the rest of the cross-linking agent after the polyacrylamide is formed.
The chemical bridge plug gel comprises, by mass, 100% of the total mass of the chemical bridge plug gel, 15-25% of acrylamide and a modified monomer, wherein the monomer proportion is 9:1, 0.4-0.8% of an organic cross-linking agent, 0.2-0.4% of polyacrylamide, 0.06% of an initiator and the balance of tap water, and the sum of the mass percentages of the raw materials of the chemical bridge plug gel is 100%;
in the wellbore high-temperature-resistant chemical bridge plug gel provided by the invention, the purity of acrylamide is preferably not lower than 99%.
In the wellbore high-temperature-resistant chemical bridge plug gel provided by the invention, preferably, the purity of the adopted modified monomer is not lower than 98%.
In the wellbore high-temperature-resistant chemical bridge plug gel provided by the invention, preferably, the adopted organic cross-linking agent comprises one or more of phenolic resin, sulfonated phenolic resin and N, N-methylene bisacrylamide;
in the high-temperature resistant chemical bridge plug gel for the shaft, preferably, the adopted polyacrylamide comprises 700 ten thousand molecular weight, the hydrolysis degree is 5-10%, and the solid content is 90%.
In the wellbore refractory chemical bridge plug gel provided by the invention, preferably, the initiator used comprises persulfate or azo organic compound.
In the wellbore high-temperature-resistant chemical bridge plug gel provided by the invention, preferably, the chemical bridge plug gel solution is prepared according to the following steps:
tap water is added into the acrylamide and the modified monomer, and the acrylamide and the modified monomer are completely dissolved.
And sequentially adding a polymer and an organic cross-linking agent into the acrylamide solution, uniformly stirring, and adding an initiator to obtain the chemical bridge plug gel solution.
According to a specific embodiment of the invention, the wellbore refractory chemical bridge plug gel of the invention is formulated with tap water.
The high-temperature-resistant chemical bridge plug gel for the shaft is suitable for shafts and naked sections at the temperature of 80-140 ℃.
When the wellbore high-temperature-resistant chemical bridge plug gel is used for temporary plugging of a wellbore, the method preferably comprises the following steps:
preparing a chemical bridge plug gel solution by using tap water, and fully and uniformly stirring at normal temperature;
and sequentially adding a polymer and an organic cross-linking agent into the solution of the acrylamide and the modified monomer, uniformly stirring, and adding an initiator to obtain the chemical bridge plug gel solution.
The chemical bridge plug gel solution is injected into the shaft and reaches a specified layer along with the rise of temperature, polymerization reaction and crosslinking reaction occur to form gel, and the shaft and an open hole section can be effectively plugged.
The target position of the chemical bridge plug gel needs different temperatures according to the depth, the gel forming time of the chemical bridge plug gel is controlled by adjusting the formula of the polymer gel according to the injection speed and the temperature of the target position, and the gel forming time of the polymer is the same as the time of reaching the target position, so that the gel forming of the chemical bridge plug gel at the specified position can be met.
The gelling time can be adjusted according to requirements and is about 0.5h to 4 h.
The temporary plugging chemical bridge plug is viscous liquid at normal temperature, and cannot be solidified at normal temperature for 24 hours, but if the temporary plugging chemical bridge plug is prepared and placed for a long time, the viscosity of the system can be increased.
The chemical bridge plug gel disclosed by the invention has a certain influence on gelling when meeting oil, does not influence gelling when meeting water, but can dilute and temporarily block the chemical bridge plug. In general, when the device is in actual use, a pad fluid is injected to clean a well bore so as to reduce the influence of oil and water.
The wellbore high-temperature-resistant chemical bridge plug gel provided by the invention comprises a polymerization system and a crosslinking system, has low viscosity before gelling, is close to water, has good migration capacity, can be used for deep plugging of a wellbore, has strength reaching grade J after gelling, and can be used for effectively plugging the wellbore and an open hole section.
The high-temperature-resistant chemical bridge plug gel for the shaft can effectively form jelly glue under the condition of being prepared by tap water at the temperature of 80-140 ℃, the jelly glue can not be degraded and divided water for 4 months at the temperature of 140 ℃, the breakthrough pressure is more than 8000kPa, and the gel can be used for plugging the shaft and an open hole section for a long time. Water diversion means that the gel polymer is dehydrated, i.e., rendered ineffective.
The chemical bridge plug composition and the gel thereof provided by the invention are not limited in applicable position, resistant to high temperature and high salinity, resistant to saline water washing, easy to unseal and low in price. The applicable positions are not limited and mainly appear as follows: is suitable for the temperature of 80-140 ℃ and the degree of mineralization of 22 multiplied by 104mg/L, the gelling time is between 0.5h and 4h, the gel is not limited within the temperature of the shaft, and the plugging of any position of the shaft can be basically met. The high temperature resistance is embodied in that: the chemical bridge plug gel is not changed after being placed in a thermostat with the temperature of 140 ℃ for 100 days, which shows that the chemical bridge plug gel has good temperature resistance; the hypersalinity resistance is represented by: after gelling, degree of mineralization 22X 10 is used4The gel does not divide water and shrink when being washed by mg/L water, which shows that the gel has good high mineralization resistance; saline-resistant appears as follows: after gelling, degree of mineralization 22X 10 is used4The gel volume is unchanged and the properties are unchanged by washing with mg/L water; easy deblocking: by using oxidative gel breakersThe system can be destroyed, and can be discharged back after being destroyed, thereby not blocking the shaft and reducing pollution.
The high-temperature resistant chemical bridge plug gel for the shaft has the advantages of reliable raw materials, wide raw material sources, convenience and simplicity in operation and wide application prospect. The invention can perform casing leakage repairing and layered water injection, reduce the well repairing operation cost, assist the cement plugging and improve the success rate of the cement plugging, simultaneously can meet the requirement that the cement returns and cannot be drilled to a target layer due to emptying leakage in the drilling process, and has wide application prospect.
The invention provides a high-temperature and high-salt resistant chemical bridge plug gel for a shaft. The raw material composition of the high-temperature resistant chemical bridge plug gel of the shaft comprises polymerized monomers and polymers: the chemical bridge plug gel comprises, by 100% of the total mass of the chemical bridge plug gel, 15-25% of acrylamide and modified monomers, wherein the monomer ratio is 9:1, 0.4-0.8% of organic cross-linking agent, 0.2-0.4% of polyacrylamide, 0.06% of initiator and the balance of tap water. The invention has the advantages that the crosslinking and the polymerization reaction are simultaneously carried out at high temperature to form a reticular space structure, and the high-temperature resistance and the anti-breakthrough performance are good.
Drawings
FIG. one is a graph of injection pressure versus PV for the wellbore refractory chemical bridge plug gel of example 1.
Figure two is a graph of injection pressure versus PV for the wellbore refractory chemical bridge plug gel of example 1.
FIG. three is a graph of injection pressure versus PV for the wellbore refractory chemical bridge plug gel of example 1.
Detailed Description
The technical solutions of the present invention will be described in detail below in order to clearly understand the technical features, objects, and advantages of the present invention, but the present invention is not limited to the practical scope of the present invention.
The gel forming performance of the high-temperature resistant chemical bridge plug gel of the shaft is evaluated by adopting an ampoule bottle visual inspection code method, the state of gel is observed by inverting the ampoule bottle, and the strength of the gel is evaluated, wherein the specific codes are shown in table 1:
table 1 gel strength code standard
The blocking performance of the high-temperature resistant chemical bridge plug gel for the shaft is evaluated according to the following steps:
and (3) filling the chemical bridge plug gel solution into a container of a high-temperature and high-pressure resistant gel breakthrough pressure evaluation device, and putting the container into an oven to gelatinize.
And (3) loading the liquid-forming device into a rock core holder, controlling the ring pressure to be 2MPa, and opening a constant flow pump connected with the holder to press formation water to the holder at the injection speed of 2 mL/min.
And opening the displacement device workstation software, monitoring the pressure change trend on the interface, and converting the pressure-time relation into a time-PV relation after the measurement is finished.
In the above examples, 2.4X 10 samples were prepared according to the water salinity analysis of a certain oil field formation5The specific composition of the mg/L simulated formation water is shown in Table 2.
TABLE 2 simulated formation water preparation composition table
Example 1
This example provides a high temperature and high salt resistant chemical bridge plug gel for a wellbore having a composition as shown in table 3.
TABLE 3 wellbore refractory chemical bridge plug gel formulation
The wellbore refractory chemical bridge plug gels of this example were evaluated for gel strength and the results are shown in table 4.
TABLE 4 wellbore high temperature chemical bridge plug gel Strength test
The wellbore high-temperature-resistant chemical bridge plug gel of the embodiment is subjected to a breakthrough pressure performance evaluation test, the injection pressure and a curve are shown in fig. 1, and the breakthrough pressure is 11500KPa.
Example 2
This example provides a high temperature and high salt chemical bridge plug gel for a wellbore having the composition shown in table 5.
TABLE 5 wellbore refractory chemical bridge plug gel formulation
The wellbore refractory chemical bridge plug gels of this example were evaluated for gel strength and the results are shown in table 6.
TABLE 6 wellbore high temperature chemical bridge plug gel Strength test
| Time/ |
1 | 7 | 30 | 60 | 90 |
| Strength of | J | J | J | J | I |
The wellbore high-temperature-resistant chemical bridge plug gel of the embodiment is subjected to a breakthrough pressure performance evaluation test, the injection pressure and a curve are shown in fig. 2, and the breakthrough pressure is 20450 KPa.
The breakthrough pressure in the examples of the present invention was measured at 140 ℃, and the temperature was affected, with higher temperatures giving lower breakthrough pressures.
Example 3
This example provides a high temperature and high salt chemical bridge plug gel for a wellbore having the composition shown in table 7.
TABLE 7 wellbore refractory chemical bridge plug gel formulation
The wellbore refractory chemical bridge plug gels of this example were evaluated for gel strength and the results are shown in table 8.
TABLE 8 wellbore high temperature chemical bridge plug gel Strength test
The wellbore high-temperature-resistant chemical bridge plug gel of the embodiment is subjected to a breakthrough pressure performance evaluation test, the injection pressure and a curve are shown in fig. 3, and the breakthrough pressure is 17500KPa.
The saline-scouring resistance of the high-temperature resistant chemical bridge plug gel of the shaft is evaluated according to the following steps:
weighing m (0) mass of the plugging agent gel, sealing, placing in a pressure-resistant glass bottle, soaking with simulated formation water, periodically taking out a sample, observing free water, weighing m (t) (the weight of the chemical bridge plug gel), and calculating the swelling rate. Expansion ratio
Specific expansion ratio changes are shown in table 9.
TABLE 9 gel swell ratio of refractory chemical bridge plug for wellbore
Wherein a (1) is the overrun after 4 days; a (2) is the swelling ratio after 15 days; a (3) is the swelling ratio after 45 days
All swelling rates are more than 0, which indicates that the gel cannot shrink under the soaking of formation water, and the reverse spitting is formed to cause the failure of water plugging.
Other embodiments of the invention are shown in table 10 below:
watch 10
The chemical bridge plug composition provided in any one of the embodiments in table 10 above is formed into 100% by the above-mentioned corresponding mass percentage and the balance of water, and then the corresponding chemical bridge plug gel can be prepared for plugging in construction. Any of the chemical bridge plug gels provided in table 10 above all have strengths as shown in table 4 of example 1 as J, and thus are not listed.
The embodiment shows that the high-temperature-resistant chemical bridge plug gel for the shaft has high breakthrough pressure, good temporary plugging performance and good market application prospect.
Claims (10)
1. A high temperature, high salt resistant chemical bridge plug composition for use in a wellbore, comprising: acrylamide, modified monomer, organic cross-linking agent, polyacrylamide and initiator;
the modified monomer is selected from 2-acrylamide-2-methylpropanesulfonic acid, methyl methacrylate and butyl acrylate; 2-acrylamido-2-methylpropanesulfonic acid is preferred.
2. The chemical bridge plug composition for the high temperature and high salt resistant wellbore of claim 1, wherein the mass ratio of the acrylamide, the modified monomer, the organic cross-linking agent, the polyacrylamide and the initiator is 15-25: 0.4-0.8: 0.2-0.4: 0.06;
preferably, the acrylamide and the modifying monomer refer to a solid mixture of the acrylamide and the modifying monomer.
3. The high temperature and high salt resistant chemical bridge plug composition for the well bore according to claim 1 or 2, wherein the mass ratio of the acrylamide and the modifying monomer is 8-10: 1, preferably 9: 1.
4. A high temperature and high salt resistant chemical bridge plug composition for use in a wellbore according to claim 1 or 2 wherein the organic cross-linking agent is selected from the group consisting of phenolic resin, sulfonated phenolic resin, N-methylene bisacrylamide;
preferably, the molecular weight of the polyacrylamide is 600-700 ten thousand, the hydrolysis degree is 5-10%, and the solid content is 90%;
preferably, the initiator comprises a persulfate or an azo organic compound.
5. A high temperature and high salt resistant chemical bridge plug gel for use in a wellbore comprising a high temperature and high salt resistant chemical bridge plug composition according to any one of claims 1 to 4 and water.
6. The high temperature and high salt resistant chemical bridge plug gel for use in a wellbore of claim 5 comprising: 15-25% of acrylamide and modified monomer by mass, 0.4-0.8% of organic cross-linking agent by mass, 0.2-0.4% of polyacrylamide by mass, 0.06% of initiator by mass, and the balance of water; the sum of the mass percentages of acrylamide, modified monomer, organic cross-linking agent, polyacrylamide, initiator and water is 100%.
7. The method for preparing the high-temperature and high-salt resistant chemical bridge plug gel for the well bore according to claim 6 or 7, wherein the gel is obtained by adding polyacrylamide, an organic cross-linking agent and an initiator into an aqueous solution of acrylamide and a modified monomer.
8. The method for preparing the high temperature and high salt resistant chemical bridge plug gel for the wellbore of claim 6, wherein the polyacrylamide, the organic cross-linking agent and the initiator are added in sequence.
9. A high temperature and high salt resistant chemical bridge plug composition for a wellbore of any one of claims 1-4, and/or a high temperature and high salt resistant chemical bridge plug gel for a wellbore of claims 5 or 6, and/or a high temperature and high salt resistant chemical bridge plug gel for a wellbore prepared by the preparation method of claims 6 or 7, for use in oil and gas development.
10. The use of claim 9, wherein the chemical bridge plug gel is suitable for use in wellbores and open hole sections at 80 ℃ to 140 ℃;
preferably, the chemical bridge plug gel is injected into a wellbore.
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Application publication date: 20220506 |