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CN-122012050-A - Slowly-dissolving temporary plugging particles for pressure flooding, preparation method thereof, channeling-preventing temporary plugging system and application

CN122012050ACN 122012050 ACN122012050 ACN 122012050ACN-122012050-A

Abstract

The invention discloses a slowly-dissolving temporary plugging particle for pressure flooding, which consists of hollow soluble metal alloy particles and a hydrophobic layer wrapped on the outer side of the hollow soluble metal alloy particles. The invention also discloses a preparation method of the slow-dissolving temporary plugging particles for pressure flooding, which comprises the following steps of (1) placing 80 parts of hollow soluble metal alloy particles in a reaction container, adding 2-10 parts of coupling agent into the reaction container, oscillating, adding 2-8 parts of network architecture agent into the reaction container, oscillating again to obtain a first fluid, adding 0.5-5 parts of catalyst into the first fluid, oscillating and uniformly mixing to obtain a second fluid, pouring out the second fluid, spreading the second fluid in the container, and irradiating by an ultraviolet lamp to obtain the slow-dissolving temporary plugging particles for pressure flooding. The invention also discloses a channeling-preventing temporary plugging system which comprises 5% -20% of pressure-driving slow-dissolving temporary plugging particles, 0.5% -5% of nonionic surfactant and the balance of water.

Inventors

  • WANG CONG
  • QU HUIMIN
  • SUN YUHAI
  • WU QIONG
  • LI YONGKANG
  • WANG HAIYAN
  • DAI QUN
  • ZHANG GUANGZHONG
  • WANG HONGWAN

Assignees

  • 中国石油化工股份有限公司
  • 中国石油化工股份有限公司胜利油田分公司

Dates

Publication Date
20260512
Application Date
20241112

Claims (14)

  1. 1. The pressure flooding is with slowly dissolving temporary blocking granule, its characterized in that comprises cavity soluble metal alloy granule and parcel in the hydrophobic layer in the cavity soluble metal alloy granule outside, wherein: The hydrophobic layer is a crosslinking system formed by a network architecture agent and a coupling agent under the irradiation of ultraviolet rays in the presence of a catalyst.
  2. 2. The pressure flooding slow-dissolving temporary plugging particle according to claim 1, which consists of the following components in terms of the total mass of the hollow soluble metal alloy particle: The content of metallic aluminum is 10.0-20.0%, the content of metallic manganese is 0.1-1.0%, the content of carbon is less than or equal to 0.05%, the content of metallic nickel is less than or equal to 0.01%, the content of metallic calcium is less than or equal to 0.005%, and the balance is metallic magnesium.
  3. 3. The pressure-flooding slow-dissolving temporary plugging particle according to claim 1, wherein the hollow soluble metal alloy particle is a spherical hollow soluble metal alloy particle, the internal cavity of the hollow soluble metal alloy particle is spherical, the external radius of the hollow soluble metal alloy particle is 50-450 μm, the internal radius of the inner cavity of the hollow soluble metal alloy particle is 45-380 μm, or The hollow soluble metal alloy particles are elliptic particles, the cavity of the hollow soluble metal alloy particles is elliptic, the major axis of the elliptic particles is 70-500 mu m, the minor axis of the elliptic particles is 30-390 mu m, the major axis of the elliptic inner cavity of the elliptic particles is 60-460 mu m, and the minor axis of the elliptic particles is 25-280 mu m.
  4. 4. The method for preparing the pressure-flooding slow-dissolving temporary plugging particles according to any one of claims 1 to 3, which is characterized by comprising the following steps in parts by mass: (1) Placing 80 parts of hollow soluble metal alloy particles in a reaction container, adding 2-10 parts of coupling agent into the reaction container, oscillating for at least 5min, preferably 5-60 min, adding 2-8 parts of network architecture agent, and oscillating for at least 5min, preferably 5-30 min again to obtain a first fluid; (2) And adding 0.5-5 parts of catalyst into the first fluid, vibrating and uniformly mixing to obtain a second fluid, pouring out the second fluid, spreading the second fluid in a container, and irradiating for at least 10min, preferably 10-240 min by an ultraviolet lamp to obtain the slow-dissolving temporary plugging particles for pressure driving.
  5. 5. The method for preparing the pressure-flooding slow-dissolving temporary plugging particles according to claim 4, wherein the coupling agent in the step (1) is one or more of vinyl trichlorosilane, vinyl trimethoxysilane, vinyl triethoxysilane, 3- (phenylamino) propyl trimethoxysilane, gamma-aminopropyl triethoxysilane, triethoxymethyl silane, acrylic propyl trimethoxysilane, gamma-chloropropyl triethoxysilane, gamma-methacryloxypropyl trimethoxysilane and 3- (2-aminoethylamino) propyl methyl dimethoxy silane.
  6. 6. The method of claim 4, wherein the network structurant in step (1) is one or more of the structural formulas R1-ch=ch-R2, R3-ch=ch-CH 2-ch=ch-R4, wherein: r1, R2, R3 and R4 are each independently selected from H, C-C18 chain alkyl, and R1 and R2 cannot be H at the same time.
  7. 7. The method for producing a pressure-flooding slow-dissolving temporary plugging particle according to claim 4, wherein the hollow soluble metal alloy particle in the step (1) is composed of the following components by total mass of the hollow soluble metal alloy particle: The content of metallic aluminum is 10.0-20.0%, the content of metallic manganese is 0.1-1.0%, the content of carbon is less than or equal to 0.05%, the content of metallic nickel is less than or equal to 0.01%, the content of metallic calcium is less than or equal to 0.005%, and the balance is metallic magnesium.
  8. 8. The method for producing a pressure-flooding temporary plugging particle as defined in claim 4, wherein in the step (1), the hollow soluble metal alloy particle is a spherical hollow soluble metal alloy particle, the inner cavity thereof is spherical, the outer radius of the hollow soluble metal alloy particle is 50-450 μm, the inner radius of the inner cavity of the hollow soluble metal alloy particle is 45-380 μm, or Further, in the step (1), the hollow soluble metal alloy particles are elliptic particles, the part cavities of the hollow soluble metal alloy particles are elliptic, the major axis of the elliptic particles is 70-500 μm, the minor axis of the elliptic particles is 30-390 μm, the major axis of the elliptic cavities of the elliptic particles is 60-460 μm, and the minor axis of the elliptic cavities of the elliptic particles is 30-280 μm.
  9. 9. The method for preparing the pressure-flooding slow-dissolving temporary plugging particles according to claim 4, wherein the process requirements of ultraviolet lamp irradiation in the step (2) are as follows: The power of the ultraviolet lamp is at least 15W, preferably 15-100W, and the distance between the ultraviolet lamp and the second fluid is not more than 40 cm, preferably 10-40 cm.
  10. 10. The method for preparing the pressure-flooding slow-dissolving temporary plugging particles according to claim 4, wherein the catalyst in the step (2) is one or more of 2,4,6 (trimethyl benzoyl) diphenyl phosphine oxide, 2-hydroxy-2-methyl-1-phenyl-1-propanone, benzoin dimethyl ether, 2-hydroxy-1- (4- (2-hydroxy-2-methylpropanoylphenyl) benzyl) -2-methyl-1-propanone, methyl benzoate, phenyl bis (2, 4, 6-trimethyl benzoyl) phosphine oxide, benzophenone, 2, 4-dihydroxybenzophenone, and/or In the step (2), the catalyst is dissolved in the organic solvent and then added into the first fluid, wherein: The addition amount of the organic solvent is 1-5ml/g based on the weight of the catalyst; the organic solvent is one or more of methanol, ethanol, isopropanol, benzene, toluene and xylene.
  11. 11. The pressure-flooding slow-dissolution temporary plugging particle is characterized by being prepared by a preparation method of the pressure-flooding slow-dissolution temporary plugging particle according to any one of claims 4-10.
  12. 12. The anti-channeling temporary plugging system is characterized by comprising the following components in percentage by mass: 5% -20% of the pressure-flooding slow-dissolving temporary plugging particles according to any one of claims 1-3 and 11, 0.5% -5% of a nonionic surfactant and the balance of water.
  13. 13. The temporary plugging prevention system of claim 12, wherein the nonionic surfactant is one or more of polyoxyethylene fatty alcohol ether, polyoxyethylene fatty acid ester, alkylphenol ethoxylate, alkyl alcohol amide, alcohol ether glycoside, polyoxyethylene alkyl alcohol amide.
  14. 14. The use of the temporary plugging prevention system according to claim 12 or 13 as temporary plugging prevention agent in exploitation of low permeability oil fields by pressure flooding water.

Description

Slowly-dissolving temporary plugging particles for pressure flooding, preparation method thereof, channeling-preventing temporary plugging system and application Technical Field The invention relates to the technical field of oilfield chemistry and oil and gas field development engineering, in particular to a pressure flooding slow-dissolution temporary plugging particle, a preparation method thereof, a channeling-preventing temporary plugging system and application thereof. Background The low permeability oil field refers to an oil field with low permeability, low abundance and low single well productivity of an oil reservoir. The low-permeability oil-gas field has important significance in oil-gas development in China, the low-permeability oil-gas resource distribution in China has the characteristics of more oil-gas content, more oil-gas reservoir types, wide distribution area, main gas containing in the upper gas and lower gas and the sea phase and oil-gas mixing in the land phase, and the low-permeability oil reservoir has high proportion in the ascertained reserves which accounts for more than 2/3 of the national reserves and has huge development potential. Low permeability fields are mainly developed by water flooding. However, the development difficulty is high because of the complex reservoir conditions of the hypotonic oil reservoir. In the water injection development process of the low permeability reservoir, the problems of high water injection pressure and high underinjection proportion are common, the contradiction of 'no injection in and no production' is prominent, effective displacement cannot be established between oil-water wells, the stratum energy is fast to decline, the productivity is fast to decline, and the production is even stopped. The pressure flooding water injection technology is an effective development technology aiming at low-permeability oil reservoirs, and aims to force the low-permeability oil reservoirs to absorb a large amount of water through ultrahigh-pressure water injection, boost pressure and increase energy in a very short time, conduct and balance pressure after well stewing, and drive crude oil to migrate to oil extraction wells, so that the pressure is released, the liquid amount is increased and the yield is increased during the well production of the oil wells, and the oil reservoir recovery rate is obviously improved. The pressure flooding water injection technology is a technology combining hydraulic fracturing and water injection, can quickly and effectively supplement stratum energy, and is expected to solve the problems. However, in the development process of the pressure flooding water injection, the problems of (1) difficult fracture steering, poor lateral micro fracture opening, single fracture, low pressure flooding sweep coefficient and low oil displacement efficiency and (2) easy excessive extension of main fracture, pressure penetration, penetration of an oil-water well, premature water channeling and production stopping of the oil well exist. In view of the above problems, it is needed to develop a temporary plugging prevention system to avoid single crack or water channeling caused by excessive extension of main cracks in the pressure flooding water injection process, and meanwhile, the temporary plugging prevention system is incompletely plugged so as to facilitate continuous water flooding and oil displacement after the pressure flooding is completed. The existing temporary plugging agents are various in types and mainly can be divided into water-soluble temporary plugging agents, acid-soluble temporary plugging agents, oil-soluble temporary plugging agents and degradable temporary plugging agents according to plugging removing modes, wherein the oil-soluble temporary plugging agents are generally made of materials such as resin, paraffin and the like, have certain pressure bearing capacity, but have thermoplasticity, are easy to soften at high temperature, are not suitable for pressure flooding water injection operation, and the temperature resistance, pressure bearing, dissolution, plugging time and the like of the other temporary plugging agents cannot simultaneously meet the pressure flooding water injection. The pressure flooding water injection process needs to resist the temperature of more than 150 ℃, the pressure difference of 20MPa, the dissolution is slow, and the temporary plugging time is 15-40 days. Chinese patent application CN115850573A discloses a water-soluble particle temporary plugging agent which comprises 15-20% of acrylamide, 1-2% of methyl acrylate, 0.5-1% of a cross-linking agent, 0.15-1.1% of an initiator, 2-5% of a mutual solvent, 0.02-0.03% of a cosolvent and the balance of water. The temporary plugging agent is fast to dissolve in water, the dissolution time is 15-20min, the plugging time is short, and the time requirement of the pressure driving operation cannot be met. The Chinese patent application CN115838589A