CN111635745B - Application of aqueous solution diluent composition in sand prevention of oil and gas wells - Google Patents
Application of aqueous solution diluent composition in sand prevention of oil and gas wells Download PDFInfo
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- 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
- C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
- C09K8/57—Compositions based on water or polar solvents
- C09K8/575—Compositions based on water or polar solvents containing organic compounds
- C09K8/5751—Macromolecular compounds
- C09K8/5758—Macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
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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
- C09K8/88—Compositions based on water or polar solvents containing organic compounds macromolecular compounds
- C09K8/90—Compositions based on water or polar solvents containing organic compounds macromolecular compounds of natural origin, e.g. polysaccharides, cellulose
- C09K8/905—Biopolymers
Abstract
The invention belongs to the technical field of oil and gas field development in the petroleum industry, and particularly relates to an application of an aqueous solution diluent composition in sand prevention of an oil and gas well. The organic high molecular aqueous solution diluent and the resin can be uniformly mixed, and can be conveniently injected into a stratum. Loose rock and free sand grains can be solidified in the stratum, and high strength compression resistance can be achieved, and the pressure can reach more than 20 MPa. The danger of using organic solvent in the oil field and the damage to the health of constructors are solved; the resin can be uniformly dispersed, so that the resin has little residue in the stratum. The multi-well comprises a horizontal well and a vertical well, has obvious sand prevention effect, does not produce sand in a stable yield for 13 months, and improves the oil gas yield.
Description
Technical Field
The invention belongs to the technical field of oil and gas field development in the petroleum industry, and particularly relates to an application of an aqueous solution diluent composition in sand prevention of an oil and gas well.
Technical Field
Along with the continuous progress of oil and gas field exploration and development, the difficulty of the problems encountered in oil and gas reservoir exploitation is gradually increased, sand production is one of the common problems in the sandstone oil reservoir exploitation process, particularly loose sandstone, because the adhesion among rock particles in the stratum is poor, the cementation degree is low, the sand is easy to separate out in the production process to form free sand, and the free sand flows to the bottom of a well along with the produced liquid to cause sand production. There are three main types of sand production: stable sand production, continuous sand production and unstable large-scale sand production. The unstable mass sand production is that the stress condition of the rock is changed under the action of various factors, the stress applied to the rock is larger than the force born by the plastic deformation of the rock, finally the rock is deformed or cracked, a large amount of free sand grains can be gathered in a short time, and the phenomenon often occurs near a well, the sand grains directly enter a shaft, and the normal production of an oil-gas well is seriously influenced.
At present, the common sand control modes mainly comprise a mechanical sand control method, a chemical sand control method and a composite sand control method. The mechanical sand control method needs to add the sand control device in the pit shaft, the later stage leads to the sand control net to block up under the serious condition of sand production easily, mechanical sand control is "permanent cure not permanent cure" simultaneously, only prevent sand grain inflow pit shaft, there is not any remedial measure to the weak consolidated rock in the stratum, this very easily leads to a large amount of uncontrollable sand production after the sand control device became invalid, simultaneously because the stratum rock is in the loose state of weak consolidation for a long time, lead to collapsing very easily, influence the life of oil gas well. The chemical sand control method is to inject chemical agents into the stratum and use the cementing agent in the stratum to cement loose rock particles, thereby essentially solving the problem of sand production of the oil and gas well; meanwhile, the chemical sand control has the advantages of simple construction, no residue at the bottom of the well, repeated construction in the later period and the like. The chemical sand control method mainly comprises epoxy resin sand control, urea resin sand control, phenolic-epoxy mixed sand control, furan resin sand control and the like. However, the cementing agent has high viscosity and cannot be directly used, and the resin is diluted by organic solvents into the stratum without exception, and the organic solvents are commonly used as follows: ethers, ethanol, acetone, petroleum ether, etc., some of which are toxic materials and have a risk of flammability, and the organic solvents are expensive, which have prevented the use of chemical sand control in sand control. In order to overcome the defects in the chemical sand control method, the water-soluble resin is one of the solutions, the water-soluble resin is an oil-in-water aqueous solution, and the resin is wrapped in a solvent, but the compressive strength formed by the method is low, the price is higher than that of the conventional resin, the use environment is harsh, the water-soluble resin is generally only used in the fields of paint spraying and coating and the like, and the water-soluble resin is rarely used for sand control of oil and gas wells. Therefore, in response to this problem in chemical sand control, it is necessary to develop a method of using an aqueous solution as a diluent for the resin.
Chinese patent document CN109370556A (201811115651. X) discloses a resin sand control liquid suitable for single-section plug injection of a sand gas well and a preparation method thereof, wherein the contents of all components are expressed by mass percent: cementing agent: 20% -25%; curing agent: 25 to 30 percent; coupling agent: 1% -2%; curing regulator: 3% -5%; diluent agent: 45 to 50 percent, and the sum of the mass percent of the components is 100 percent. However, the diluent in the patent is NaCl solution, and the diluent can cause two phases of the resin and the curing agent to separate, so that the uniformity of the liquid cannot be ensured during injection, and the injection effect is influenced. Therefore, it is only suitable for modifying urea-formaldehyde resin powder, and the modification can make it soluble in NaCl solution, but for conventional urea-formaldehyde resin and other resins, because the resin is non-polar material and water-insoluble, the resin powder is insoluble in NaCl solution, and the liquid resin and NaCl solution are also immiscible, and the layering can result in non-uniform injection during injection.
Because the resin is high in density and can sink to the bottom, uneven injection can cause that the resin content in the liquid which is firstly injected into the stratum is high, and the content in the stratum which is then injected is low, so that the sand prevention effect is poor.
Disclosure of Invention
The invention provides an application of an aqueous solution diluent composition in sand control of an oil-gas well, aiming at solving the problems that most of resin in the sand control agent is toxic, and the existing aqueous solution diluent can not uniformly disperse resin, so that the sand control agent can not be uniformly injected into a stratum. The aqueous solution of the aqueous solution diluent composition can be uniformly mixed with resin, the layering phenomenon cannot be caused due to gravity factors, a high-strength sand-proof barrier can be formed, indoor experiments prove that the compressive strength reaches more than 20MPa, the production requirement of an oil-gas well is completely met, and the aqueous solution diluent composition has the advantages of low cost, safety and environmental protection in use and no pollution.
In order to achieve the purpose, the invention adopts the following technical scheme:
the aqueous solution diluent composition comprises guanidine gum and sodium alginate, and the aqueous solution of the guanidine gum and sodium alginate composition is used for diluting resin in a sand control system.
Sodium alginate is generally used as a food additive to increase the mouthfeel of food, and can be used as a gel material; the printing and spinning industry is used for reactive dye materials. The guanidine gum is used as a sand carrying fluid of a fracturing fluid and is a commonly used material in fracturing construction.
The guanidine gum can make resin and other water-insoluble materials uniformly dispersed in water phase, and can play a role in suspension. However, guanidine gum is difficult to flow and remains in the formation. The residual quantity of the guar gum in the stratum is too high, so that the stratum is easily polluted, the problem can be well solved by using the guar gum and the sodium alginate in a mixed manner, and the residual quantity of the guar gum can be reduced. The residual quantity of the sodium alginate in the stratum is low, the sodium alginate can be produced along with produced fluid, and the guanidine gum can be taken out. Although sodium alginate can play a certain role in tackifying in a stratum with high divalent ion solubility, pure sodium alginate has limited viscosity and cannot play a role in uniformly dispersing resin like guar gum, so that two materials are required to be compounded and used in proportion.
Preferably, the mass ratio of the guar gum to the sodium alginate in the composition is 1:1 to 100. Further preferably, the mass ratio of the guar gum to the sodium alginate is 1.
Preferably, in the above application, the mass concentration of the composition in the aqueous solution is 0.1 to 5%. More preferably, it is 0.5 to 1%.
Preferably, in the above application, the sand control system comprises the following components by weight: 100 parts of epoxy resin, 15-40 parts of curing agent, 0.5-4 parts of additive and 100-500 parts of the aqueous solution containing the composition.
Preferably, the sand control system comprises the following components in parts by weight: 100 parts of epoxy resin, 15-40 parts of curing agent, 0.8-1 part of additive and 300-400 parts of the aqueous solution.
Further preferably, the epoxy resin comprises one or more of bisphenol a type epoxy resin, bisphenol F type epoxy resin and polyphenol type glycidyl ether epoxy resin. The bisphenol A type epoxy resin includes one or both of bisphenol A type epoxy resin E-44 and bisphenol A type epoxy resin E-51.
More preferably, the epoxy resin curing agent includes one of a modified amine curing agent and an acid anhydride curing agent.
More preferably, when the epoxy resin curing agent is an anhydride curing agent, the sand control system further comprises an imidazole accelerator. The imidazole accelerator is used for accelerating the reaction rate of the resin and the curing agent, and can be used for accelerating the reaction of the resin and the curing agent under the conditions of low temperature, low curing efficiency, high water content and poor curing effect on some oil fields, and the ratio of the anhydride curing agent to the imidazole accelerator is 10-20.
More preferably, the anhydride curing agent is one or two of phthalic anhydride and maleic anhydride; the imidazole accelerator comprises one or more of 2-ethyl-4-methylimidazole, 2-methylimidazole and 2-undecylimidazole.
Preferably, the epoxy resin additive is a silane coupling agent, and the silane coupling agent comprises one or more of a silane coupling agent KH-550, a silane coupling agent KH-560, and a silane coupling agent KH-570. The silane coupling agent enhances the adhesion between the hydrophobic material, resin, and the hydrophilic material, sand.
Preferably, the specific method of the application is as follows: preparing an aqueous solution with required concentration on site, uniformly mixing the aqueous solution of the composition, epoxy resin, an epoxy resin curing agent and a resin additive according to the component proportion, and injecting the mixture into a well; closing the well for 1-3 days to ensure that the resin and the curing agent fully react, and then opening the well for production.
Preferably, the formation temperature for the above applications is in the range of 40 ℃ to 150 ℃.
The invention provides one or more embodiments, which have at least the following advantages:
(1) The aqueous solution of the composition can be uniformly mixed with resin to form milky white solution similar to milk, so that the viscosity of the resin is greatly reduced, and the composition is convenient to inject into a stratum.
(2) The aqueous solution of the composition can carry resin to solidify loose rock and free sand grains in the stratum, and can achieve high strength and compression resistance which can reach more than 20 MPa. The sand column after the water solution of the composition of the invention and the epoxy resin are cemented is impacted by 1000mL/min water flow for 2 hours, the average sand yield is less than 0.01 percent, the compressive strength can still reach 20Mpa, the compressive strength reduction rate of the sand column after being soaked in formation water and crude oil for 30 days is less than 8 percent, and the permeability recovery value is more than 80 percent.
(3) The aqueous solution of the composition is simple to prepare, low in cost, non-toxic and environment-friendly, and can ensure the safety of constructors in field application.
(4) The invention does not need organic solvent to realize the dilution of the resin, thus solving the danger of using the organic solvent in the oil field and the damage to the health of constructors; the resin can be uniformly dispersed, so that the residue of the resin in the stratum is less, if a simple resin system is adopted, the stratum is probably sealed, and other construction procedures are not needed for solving the problem; the compression strength is 3MPa to 20MPa, and the compression requirement on the oil field can be completely met. The dozens of wells applying the invention comprise horizontal wells and vertical wells, the sand control effect is good, the sand production phenomenon does not occur in 13 months of stable production, and the oil gas yield can be improved.
Drawings
FIG. 1 is an appearance of an aqueous solution of the composition;
FIG. 2 is an external view of an epoxy resin mixed with an aqueous solution of the composition;
FIG. 3 is a schematic representation of a cured sand column in an embodiment of the present invention.
FIG. 4 is a graph showing the variation of water content in the produced fluid before and after sand control construction of a certain production well;
FIG. 5 is a graph showing the variation of the fluid production before and after sand control construction for a certain production well.
Detailed Description
The present invention will be further described with reference to the following examples, but is not limited thereto. The test methods described in the following examples are, unless otherwise specified, conventional methods; the reagents and materials are commercially available, unless otherwise specified.
Example 1
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1; the mass fraction of the composition in the aqueous solution of the composition was 0.5%.
The mass ratio of the aqueous composition solution, the epoxy resin curing agent and the resin additive is 400.
Wherein the epoxy resin curing agent is phthalic anhydride, and the accelerator is Benzyl Dimethylamine (BDMA); the epoxy resin is bisphenol A type epoxy resin E-51; the resin additive is silane coupling agent KH-550.
Uniformly mixing the aqueous solution of the composition, bisphenol A type epoxy resin E-51, phthalic anhydride, benzyl Dimethylamine (BDMA) and a silane coupling agent KH-550 according to a mass ratio to prepare a sand consolidation agent, then mixing the sand consolidation agent with quartz sand, curing the mixture in an oven at 80 ℃ for 48 hours, then manufacturing a sand column according to a standard (China's republic of China oil and gas industry standard SY/T6572-2003), and testing that the compressive strength of the sand column can reach 8Mpa and the permeability of the sand column is 2.03D.
The sand column was flushed with 1000mL/min of water for 2 hours without sand production. By using the thinner composition to perform sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 2
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1; the mass fraction of the composition in the aqueous solution of the composition was 1%.
The mass ratio of the aqueous solution of the composition to the epoxy resin to the curing agent of the epoxy resin to the resin additive is 300.
The curing agent is phthalic anhydride; the promoter is Benzyl Dimethylamine (BDMA); the epoxy resin is bisphenol A type epoxy resin E-51; the resin additive is a silane coupling agent KH-560.
Uniformly mixing the aqueous solution of the composition, bisphenol A epoxy resin E-51, phthalic anhydride, benzyl Dimethylamine (BDMA) and a silane coupling agent KH-560 according to a ratio to prepare a sand consolidation agent, then mixing the sand consolidation agent with quartz sand, curing the mixture in an oven at 60 ℃ for 72 hours, and then manufacturing a sand column according to a standard, wherein the compressive strength of the tested sand column can reach 5Mpa. The sand column permeability was 1.89D.
The sand column was impacted with 1000mL/min water flow for 2 hours with no sand production. By using the thinner composition to perform sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 3:
the application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1; the mass fraction of the composition in the aqueous solution of the composition was 0.8%.
The mass ratio of the aqueous composition solution, the epoxy resin curing agent and the resin additive is 350.
The epoxy resin curing agent is phthalic anhydride, and the accelerator is Benzyl Dimethylamine (BDMA); the epoxy resin is bisphenol A type epoxy resin E-51; the resin additive is silane coupling agent KH-570.
Uniformly mixing the aqueous solution of the composition, bisphenol A epoxy resin E-51, phthalic anhydride, benzyl Dimethylamine (BDMA) and a silane coupling agent KH-570 according to a ratio to prepare a sand consolidation agent, then mixing the sand consolidation agent with quartz sand, curing the mixture in an oven at 90 ℃ for 24 hours, and then manufacturing a sand column according to a standard, wherein the compressive strength of the tested sand column can reach 10Mpa. The permeability of the sand column was 2.67D.
The sand column was flushed with 1000mL/min of water for 2 hours without sand production. When the thinner composition is used for sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 4
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1; the mass fraction of the composition in the aqueous solution of the composition was 0.5%.
The mass ratio of the aqueous composition solution, the epoxy resin curing agent and the resin additive is 1000.
The epoxy resin curing agent is phthalic anhydride, and the accelerator is Benzyl Dimethylamine (BDMA); the epoxy resin is bisphenol A type epoxy resin E-51; the resin additive is silane coupling agent KH-550.
Uniformly mixing the aqueous solution of the composition, bisphenol A type epoxy resin E-51, phthalic anhydride, benzyl Dimethylamine (BDMA) and a silane coupling agent KH-550 according to a ratio to prepare a sand consolidation agent, then mixing the sand consolidation agent with quartz sand, curing the mixture in an oven at 60 ℃ for 72 hours, then manufacturing a sand column according to a standard, and testing the compressive strength of the sand column to reach 5.5Mpa. The permeability of the sand column was 2.01D.
The sand column was flushed with 1000mL/min of water for 2 hours without sand production. By using the thinner composition to perform sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 5
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1; the mass fraction of the composition in the aqueous solution of the composition was 0.5%.
The composition comprises an aqueous solution, epoxy resin, an epoxy resin curing agent and a resin additive, wherein the mass ratio of the composition to the epoxy resin curing agent is 400.
The epoxy resin curing agent is epoxy resin curing agent T-31; the epoxy resin is bisphenol A type epoxy resin E-51; the resin additive is silane coupling agent KH-550.
The aqueous solution of the composition, bisphenol A epoxy resin E-51, epoxy resin curing agent T-31 and silane coupling agent KH-550 are uniformly mixed according to a ratio to prepare a sand consolidation agent, then the sand consolidation agent is mixed with quartz sand, the mixture is cured for 12 hours in an oven at 130 ℃, and the compressive strength of a sand column can reach 9Mpa, and the permeability is 2.96D.
The sand column was flushed with 1000mL/min of water for 2 hours without sand production. When the thinner composition is used for sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 6
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1; the mass fraction of the composition in the aqueous solution of the composition was 0.5%.
The mass ratio of the aqueous composition solution, the epoxy resin, the epoxy curing agent and the resin additive is 300.
The epoxy resin curing agent is phthalic anhydride, and the accelerator is Benzyl Dimethylamine (BDMA); the resin is bisphenol A type epoxy resin E-51; the resin additive is silane coupling agent KH-550.
Uniformly mixing the aqueous solution of the composition, bisphenol A type epoxy resin E-51, phthalic anhydride, benzyl Dimethylamine (BDMA) and a silane coupling agent KH-550 according to a ratio to prepare a sand consolidation agent, then mixing the sand consolidation agent with quartz sand, curing the mixture in an oven at 100 ℃ for 48 hours, then manufacturing a sand column according to a standard (China's republic of China oil and gas industry standard SY/T6572-2003), and testing that the compressive strength of the sand column can reach 21.09Mpa and the permeability of the sand column is 1.56D.
The sand column was impacted with 1000mL/min water flow for 2 hours with no sand production. When the thinner composition is used for sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 7
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1. The other conditions were the same as in example 1. The compressive strength of the sand column is 7.98Mpa, and the permeability is 1.88D.
The sand column was impacted with 1000mL/min water flow for 2 hours with no sand production. By using the thinner composition to perform sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 8
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1. The other conditions were the same as in example 1. The compressive strength of the sand column is 6.97Mpa, and the permeability is 2.0D.
The sand column was flushed with 1000mL/min of water for 2 hours without sand production. When the thinner composition is used for sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Example 9
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1. The other conditions were the same as in example 1. The compressive strength of the sand column is 6.08Mpa, and the permeability of the sand column is 2.19D.
The sand column was impacted with 1000mL/min water flow for 2 hours with no sand production. When the thinner composition is used for sand control treatment, the permeability of the stratum can keep more than 80% of the previous permeability of the stratum.
Comparative example 1
The guar gum aqueous solution with the mass fraction of 0.5 percent is used for sand control of oil and gas wells, and other conditions are the same as in example 1. The compressive strength of the obtained sand column is 8.15Mpa, the permeability is 1.03D, and the permeability of the sand column can be reduced by using guanidine gum.
The sand column was flushed with 1000mL/min of water for 2 hours without sand production. The diluent is used for sand control treatment, and the permeability of the stratum is 41.6 percent of the previous permeability of the stratum.
Comparative example 2
The sodium alginate aqueous solution with the mass fraction of 0.5 percent is used for sand control of oil and gas wells, and other conditions are the same as in example 1. The compressive strength of the prepared sand column is 3.43Mpa, the permeability is 2.26D, and the compressive strength of the sand column can be reduced only by using sodium alginate, which can be caused by uneven dispersion of resin, so that the overall consolidation effect of the sand column is poor.
And (3) using 1000mL/min water flow to impact the sand column for 2 hours, wherein sand grains are produced and the sand content is 1.5%.
Sodium alginate and gelatin are adopted to prepare an aqueous solution diluent with the mass fraction of 1% according to the mass ratio of 5. Sodium alginate and polyvinyl alcohol are prepared into an aqueous solution diluent with the mass fraction of 1% according to the mass ratio of 5 to 1, and the aqueous solution diluent is dissolved for 5 to 6 hours in an environment with the temperature of 80 ℃, so that the polyvinyl alcohol can be completely dissolved, the time consumption is high, and the price of the polyvinyl alcohol is high.
Guanidine gum, polyvinyl alcohol and gelatin are all high molecular materials, can all form high viscosity fluid, can suspend evenly dispersed to the resin, but the dissolution of gelatin, polyvinyl alcohol needs the heating, especially polyvinyl alcohol, 1% content dissolves 5 hours under 70 ℃ and can dissolve, can't implement at the job site, gelatin needs more than 40 ℃ just can dissolve fast, and gelatin contains impurity, and the purity is difficult to guarantee, can finally influence the result of use.
Comparative example 3
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is (2). The other conditions were the same as in example 1. The compressive strength of the sand column is 7.67Mpa, the permeability of the sand column is 1.39D, which is lower than the requirement that the permeability retention rate is more than 80%.
The sand column was flushed with 1000mL/min of water for 2 hours without sand production. The diluent composition was used to perform a sand control treatment and the permeability of the formation was 61.6% of the previous permeability of the formation.
Comparative example 4
The application of an aqueous solution diluent composition in sand control of oil and gas wells: the aqueous solution diluent composition comprises guar gum and sodium alginate, and the mass ratio is 1. The other conditions were the same as in example 1. The compressive strength of the sand column is 4.69MPa, and the permeability of the sand column is 1.89D.
And (3) using 1000mL/min water flow to impact the sand column for 2 hours, wherein the sand yield is 0.5%. The diluent composition was used to perform a sand control treatment and the permeability of the formation was 83.8% of the previous permeability of the formation.
Application example
The method is used for overcoming the defects that a certain well in a certain block of an oil field is broken due to sand abrasion of a pump pipe, oil and gas are leaked, the daily production liquid is 12t, the water content is 99.9 percent, and oil is not produced before sand control construction. Then epoxy resin sand consolidation is carried out, and the construction sequence is as follows: preparing an aqueous solution of a guar gum and sodium alginate composition on site, wherein the mass concentration of the aqueous solution is 1.5%, and the weight ratio of the guar gum to the sodium alginate is 1The aqueous solution, epoxy resin (epoxy resin E51), an epoxy resin curing agent (curing agent is phthalic anhydride, accelerating agent is benzyl dimethylamine, the mass ratio of the two is 15; preparing a mixed solution on site according to a mass ratio of 300 3 And closing the well and then opening the well for production after 3 days.
The water content change and the liquid yield change of the produced liquid before and after the sand control treatment of the well are shown in figures 4 and 5, after construction, the daily liquid yield reaches 32t at most, then the daily oil yield is stabilized at 17t, the daily oil yield is 1.2t, the water content is reduced to 93 percent, and the oil yield is increased by 122t cumulatively.
Claims (10)
1. The application of the aqueous solution diluent composition in sand control of oil and gas wells is characterized in that the aqueous solution diluent composition comprises guar gum and sodium alginate, and the application is to use the aqueous solution of the guar gum and sodium alginate composition for diluting resin in a sand control system;
the mass ratio of the guanidine gum to the sodium alginate is 1;
the mass concentration of the composition in the aqueous solution diluent is 0.1-5%.
2. Use according to claim 1, wherein the composition is present in the aqueous diluent in a mass concentration of 0.5 to 1%.
3. The use of claim 2, wherein the sand control system comprises the following components by weight: 100 parts of epoxy resin, 15-40 parts of curing agent, 0.5-4 parts of additive and 100-500 parts of aqueous solution of the composition.
4. The use according to claim 3, wherein the epoxy resin comprises one or more of bisphenol A epoxy resin, bisphenol F epoxy resin and polyphenol glycidyl ether epoxy resin.
5. The use according to claim 4, wherein the bisphenol A type epoxy resin comprises one or both of bisphenol A type epoxy resin E-44 and bisphenol A type epoxy resin E-51.
6. The use of claim 3, wherein the epoxy resin curing agent comprises one of a modified amine curing agent or an anhydride curing agent.
7. The use according to claim 6, wherein when the epoxy resin curing agent is an anhydride curing agent, the sand control system further comprises an imidazole accelerator; the ratio of the acid anhydride curing agent to the imidazole accelerator is 10-20.
8. The use according to claim 3, wherein the epoxy resin additive is a silane coupling agent, and the silane coupling agent comprises one or more of a silane coupling agent KH-550, a silane coupling agent KH-560, and a silane coupling agent KH-570.
9. The application of any one of claims 1 to 8, wherein a composition aqueous solution with a required concentration is prepared on site, and the composition aqueous solution, the epoxy resin curing agent and the resin additive are uniformly mixed according to the component proportion and are injected into a well; closing the well for 1-3 days to ensure that the resin and the curing agent fully react, and then opening the well for production.
10. The use according to claim 9, wherein the formation temperature is adapted to be 40 ℃ to 150 ℃.
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| CN110317594B (en) * | 2019-08-13 | 2021-11-05 | 青岛大地新能源技术研究院 | Sand control agent for realizing sand auto-agglutination |
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| CN104946233A (en) * | 2014-03-28 | 2015-09-30 | 北京仁创科技集团有限公司 | Self-suspension supporting agent for natural water fracturing |
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| CN106928617A (en) * | 2015-12-30 | 2017-07-07 | 北京仁创科技集团有限公司 | Expanding material composition containing polyacrylamide and from suspended prop and the preparation method and application of proppant |
| CN110725663A (en) * | 2019-11-06 | 2020-01-24 | 中国石油天然气股份有限公司 | Chemical plugging process for well without damage of fixed pipe column sleeve of bridge plug |
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| CN104946233A (en) * | 2014-03-28 | 2015-09-30 | 北京仁创科技集团有限公司 | Self-suspension supporting agent for natural water fracturing |
| CN104948154A (en) * | 2014-03-28 | 2015-09-30 | 北京仁创科技集团有限公司 | Natural water fracturing construction method |
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| CN106928617A (en) * | 2015-12-30 | 2017-07-07 | 北京仁创科技集团有限公司 | Expanding material composition containing polyacrylamide and from suspended prop and the preparation method and application of proppant |
| CN110725663A (en) * | 2019-11-06 | 2020-01-24 | 中国石油天然气股份有限公司 | Chemical plugging process for well without damage of fixed pipe column sleeve of bridge plug |
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