High-elasticity dual-network polymer particle profile control agent and preparation method thereof
By adopting high-elastic dual network polymer particle dissection modifier, the problem of poor adaptability of existing dissection modifiers in high-temperature and high-mineralization reservoirs is solved, and the effect of efficient sealing of water channels is achieved, meeting the high-strength sealing needs of high-temperature and high-salt reservoirs is achieved.
Patent Information
- Application Number
- CN202311571225.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-23
- Publication Date
- 2025-05-23
AI Technical Summary
The existing profile regulators have poor adaptability in high-temperature and high-mineralization reservoirs, making it difficult to effectively block the advantageous water channel, resulting in serious water leakage from the oil well.
A high elastic double network polymer particle dispensing agent is used, which forms binet polymer particles with high elasticity and high temperature resistance and high mineralization through a combination of a second crosslinking polymer monomer, a second crosslinking agent, a second initiator and a first crosslinking network product.
The profile adjuster exhibits high elasticity, pressure resistance and good sealing performance under high temperature and high salt conditions. It can exist stably for 120 days, meets the high-strength sealing needs of high-temperature high-salt reservoirs, improves conflicts between and within the reservoirs, and effectively seals water traversing channels.
Smart Images
Figure CN120025496A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the field of crude oil exploitation, and in particular to a high-elasticity double-network polymer particle profile control agent and a preparation method thereof. Background Art
[0002] The deep reservoirs in Tuha Oilfield have high reservoir temperatures and high formation water mineralization. After long-term water injection development, the heterogeneity between layers has intensified, forming a dominant water flow channel and causing serious water channeling in oil wells. The profile control system used in the past had poor adaptability, resulting in unsatisfactory profile control effects.
[0003] Conventional polymer gels have good penetration and can be cross-linked underground, but are affected by formation shear and temperature mineralization, and their gel formation uncertainty is relatively large. Conventional polymer microspheres have a fast swelling rate and insufficient temperature resistance, and there are problems of "not being able to get in" or "not being able to block". After the bulk particles absorb water and swell, their strength and elasticity decrease rapidly, and they are not resistant to shear, and their plugging and migration capabilities are poor. The above profile control agents are difficult to adapt to the current profile control technology requirements of high-temperature and high-mineralization reservoirs. Summary of the invention
[0004] The present invention provides a high-elasticity double-network polymer particle profile control agent and a preparation method thereof, which can improve the inter-layer and intra-layer contradictions of high-temperature and high-mineralized oil reservoirs and block the dominant channel of water channeling.
[0005] The present invention provides a high-elasticity double network polymer particle profile control agent, which is polymerized by a second cross-linking polymerization monomer, a second cross-linking agent, a second initiator, and a first cross-linking network product. The first cross-linking network product is polymerized by a first cross-linking polymerization monomer, a first cross-linking agent, and a first initiator. The weight ratio of the first cross-linking polymerization monomer, the first cross-linking agent, and the first initiator is 96-98: 2.5-3.5: 0.1-0.2. The weight ratio of the second cross-linking polymerization monomer, the first cross-linking network product, the second cross-linking agent, and the second initiator is 97-99: 7.2-7.3: 0.3-0.4: 0.6-0.8.
[0006] Furthermore, the first cross-linking polymerizable monomer includes at least one of 2-acrylamide-2-methylpropanesulfonic acid, 1-vinyl-2-pyrrolidone, and N-acryloylmorpholine.
[0007] Furthermore, the second cross-linking polymerizable monomer includes acrylamide and / or sodium acrylate.
[0008] Further, the first cross-linking agent and the second cross-linking agent both include N,N'-methylenebisacrylamide.
[0009] Furthermore, the first initiator and the second initiator both include at least one of azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, and azobiscyanovaleric acid.
[0010] The present invention provides a method for preparing a high-elasticity double network polymer particle profile control agent, comprising the following steps: polymerizing a first cross-linking polymerization monomer, a first cross-linking agent, and a first initiator, wherein the weight ratio of the first cross-linking polymerization monomer, the first cross-linking agent, and the first initiator is 96-98:2.5-3.5:0.1-0.2, to obtain a first cross-linking network product. Polymerizing a second cross-linking polymerization monomer, a second cross-linking agent, a second initiator, and the first cross-linking network product, wherein the weight ratio of the second cross-linking polymerization monomer, the second cross-linking agent, and the second initiator is 97-99:0.3-0.4:0.6-0.8, to obtain a high-elasticity double network polymer particle profile control agent.
[0011] Further, the first cross-linking polymerization monomer, the first cross-linking agent, and the first initiator are polymerized, including: taking the first cross-linking polymerization monomer and adding water to dissolve, taking the first cross-linking agent, stirring and dissolving with the first cross-linking polymerization monomer aqueous solution in a reaction tank. After uniform dissolution, the inert gas is purged for 15 minutes. After the purging is completed, the first initiator is added, the reaction tank is sealed, and then placed in a 60° C. constant temperature drying oven for polymerization for 24 hours.
[0012] Further, the second cross-linked polymerization monomer, the second cross-linking agent, the second initiator, and the first cross-linked network product are polymerized, including: weighing the second cross-linked polymerization monomer, adding water to dissolve it, taking the second cross-linked polymerization monomer aqueous solution in a reaction tank, adding the second cross-linking agent and stirring to dissolve it, purging with an inert gas, and then adding the second initiator, and adding the first cross-linked network product to the reaction tank, sealing the reaction tank, and then placing it in a 4°C refrigerator to fully swell for 24 hours, taking out the reaction tank, removing excess aqueous solution in the reaction tank, sealing the reaction tank again, and continuing to polymerize in a constant temperature drying oven at 60°C for 24 hours.
[0013] Furthermore, the inert gas includes at least one of nitrogen, helium and argon.
[0014] Furthermore, after continuing the polymerization in a constant temperature drying oven at 60° C. for 24 hours, the second cross-linked network product in the reaction tank was immersed in water.
[0015] Compared with the prior art, the present invention has the following effects:
[0016] The high-elasticity double-network polymer particle profile control agent of the present invention is a double-network polymer with high elasticity, high strength resistance, temperature resistance and salt resistance. The colloid equivalent tensile deformation can reach 345%. When compressed to 90%, the compression strength can reach 0.6MPa, and the elastic modulus can be greater than 2000Pa. The particles are evenly dispersed in water and can stably exist for 120 days under the conditions of 90°C temperature and 20×104mg / L mineralization. The high-strength plugging technical requirements of the near-wellbore area of high-temperature and high-salinity oil reservoirs are met, and the contradictions between layers and within layers of high-temperature and high-mineralized oil reservoirs can be improved, and the dominant water channeling channel can be blocked. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.
[0018] Figure 1 This is a preparation process diagram of the high elastic double network polymer particle profile control agent of the present invention;
[0019] Figure 2 The figure is a flow chart of the research and development of the high elastic double network polymer particle profile control agent of the present invention. DETAILED DESCRIPTION
[0020] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present invention and are not used to limit the present invention.
[0021] See also Figure 1-2 An embodiment of the present invention provides a high-elastic double-network polymer particle profile control agent, which is formed by polymerizing a second cross-linking polymerization monomer (or monomer B), a second cross-linking agent, a second initiator, and a first cross-linking network product.
[0022] In the preparation process of the high elastic double network polymer particle profile control agent, the amount of the second cross-linking polymerization monomer is 97-99 parts by weight, which can be 97, 98, 99, etc. parts by weight. The second cross-linking polymerization monomer includes acrylamide (AM) and / or sodium acrylate. The second cross-linking polymerization monomer can be acrylamide, sodium acrylate, or a mixture of acrylamide and sodium acrylate.
[0023] In the preparation process of the high elastic double network polymer particle profile control agent, the amount of the second crosslinking agent is 0.3-0.4 parts by weight, which can be 0.3, 0.35, 0.4, etc. The second crosslinking agent includes N,N'-methylenebisacrylamide (MBAA).
[0024] In the preparation process of the high elastic double network polymer particle profile control agent, the amount of the second initiator is 0.6-0.8 parts by weight, which can be 0.6, 0.7, 0.8, etc. parts by weight. The second initiator includes at least one of azobisisobutylamidine hydrochloride (V-50), azobisisobutylimidazoline hydrochloride (VA-044), and azobiscyanovaleric acid (V-501). The second initiator can be azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, azobiscyanovaleric acid, or a mixture of azobisisobutylamidine hydrochloride and azobisisobutylimidazoline hydrochloride.
[0025] In the preparation process of the high elastic double network polymer particle profile control agent, the amount of the first cross-linked network product is 7.2-7.3 parts by weight, which can be 7.20, 7.25, 7.30, etc. parts by weight. The first cross-linked network product is polymerized by a first cross-linked polymerization monomer (or monomer A), a first cross-linking agent, and a first initiator. The first cross-linked network product obtained by polymerization is all used to prepare the high elastic double network polymer particle profile control agent.
[0026] In the preparation process of the first cross-linked network product, the amount of the first cross-linked polymerization monomer is 96-98 parts by weight, which can be 96, 97, 98, etc. parts by weight. The first cross-linked polymerization monomer includes at least one of 2-acrylamide-2-methylpropane sulfonic acid (AMPS), 1-vinyl-2-pyrrolidone (NVP), and N-acryloylmorpholine. The first cross-linked polymerization monomer can be 2-acrylamide-2-methylpropane sulfonic acid, 1-vinyl-2-pyrrolidone, N-acryloylmorpholine, or a mixture of 2-acrylamide-2-methylpropane sulfonic acid and 1-vinyl-2-pyrrolidone.
[0027] In the preparation process of the first cross-linked network product, the amount of the first cross-linking agent is 2.5-3.5 parts by weight, which can be 2.5, 3, 3.5, etc. The first cross-linking agent includes N, N'-methylenebisacrylamide (MBAA). The first cross-linking agent and the second cross-linking agent can be the same cross-linking agent.
[0028] In the preparation process of the first cross-linked network product, the amount of the first initiator is 0.1-0.2 parts by weight, which can be 0.1, 0.15, 0.2, etc. parts by weight. The first initiator includes at least one of azobisisobutylamidine hydrochloride (V-50), azobisisobutylimidazoline hydrochloride (VA-044), and azobiscyanovaleric acid (V-501). The first initiator can be azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, azobiscyanovaleric acid, or a mixture of azobisisobutylamidine hydrochloride and azobisisobutylimidazoline hydrochloride. The first initiator and the second initiator can be the same initiator.
[0029] The high elastic double network polymer particle profile control agent of the present invention is a double network polymer with high elasticity, high strength resistance, temperature resistance and salt resistance. Its colloid equivalent tensile deformation is 345%, and when compressed to 90%, the compression strength can reach 0.6MPa, and the elastic modulus is greater than 2000Pa. The particles are evenly dispersed in water and can stably exist for 120 days under the conditions of 90°C temperature and 20×104mg / L mineralization, meeting the high-strength plugging technical requirements of the near-wellbore area of high-temperature and high-salinity oil reservoirs, and can improve the contradictions between layers and within layers of high-temperature and high-mineralized oil reservoirs, and plug the dominant channel of water channeling.
[0030] The embodiment of the present invention further provides a method for preparing the above-mentioned high elastic double network polymer particle profile control agent, comprising the following steps:
[0031] The first stage, preparation of the first cross-linked network:
[0032] The first cross-linking polymerization monomer, the first cross-linking agent and the first initiator are polymerized, and the weight ratio of the first cross-linking polymerization monomer, the first cross-linking agent and the first initiator is 96-98:2.5-3.5:0.1-0.2 to obtain a first cross-linking network product.
[0033] The above process can be specifically as follows: take the first cross-linking polymerization monomer and add deionized water to dissolve, take the first cross-linking agent, stir and dissolve it with the first cross-linking polymerization monomer aqueous solution in the reaction tank-beaker. After uniform dissolution, purge with inert gas for 15 minutes. After the purge is completed, quickly add the first initiator, seal the beaker, and then put it into a 60°C constant temperature drying oven for polymerization for 24 hours to obtain the first cross-linked network product. Among them, the inert gas includes at least one of nitrogen, helium, and argon. The inert gas can be nitrogen, helium, or argon.
[0034] The second stage, preparation of the second cross-linked network:
[0035] The second cross-linking polymerization monomer, the second cross-linking agent, the second initiator and the first cross-linking network product are polymerized, and the weight ratio of the second cross-linking polymerization monomer, the second cross-linking agent and the second initiator is 97-99:0.3-0.4:0.6-0.8 to obtain a high elastic double network polymer particle profile control agent.
[0036] The above process can be specifically as follows: weigh the second cross-linked polymerization monomer, add deionized water to dissolve, take the second cross-linked polymerization monomer aqueous solution in the reaction tank-beaker, add the second cross-linking agent to stir and dissolve, purge with inert gas, then quickly add the second initiator, and add the first cross-linked network product to the beaker, seal the beaker, and then put it in a 4°C refrigerator to fully swell for 24 hours, take out the beaker, remove the excess aqueous solution in the beaker, seal the beaker again, and continue to polymerize in a constant temperature drying oven at 60°C for 24 hours, soak the second cross-linked network product in the beaker in sufficient deionized water to remove the unreacted monomers, and obtain a high-elasticity double network polymer particle profile control agent. Among them, the inert gas includes at least one of nitrogen, helium, and argon. The inert gas can be nitrogen, helium, or argon.
[0037] The following is a detailed description with reference to specific embodiments:
[0038] Example 1
[0039] The first stage, preparation of the first cross-linked network: 51.81g of AMPS was taken and dissolved in deionized water. 1.341g of MBAA cross-linker was added and stirred with the AMPS aqueous solution in a beaker to dissolve. After uniform dissolution, nitrogen was purged for 15 minutes. After the purge, 0.083g of V50 initiator was quickly added, and then placed in a 60°C constant temperature drying oven for polymerization. After 24 hours, the beaker was taken out of the constant temperature drying oven to obtain the first cross-linked network product after polymerization.
[0040] The second stage, preparation of the second cross-linked network: weigh 39.80g of AM and dissolve it in deionized water. Add 0.142g of MBAA cross-linker and stir to dissolve. Purge with nitrogen for 15 minutes, then quickly add 0.291g of V50 initiator, and add 2.98g of the prepared first cross-linked network product into the beaker, seal the beaker, and then put it into a 4°C refrigerator to fully swell for 24 hours. Take the beaker out of the refrigerator. In the beaker, the volume of the gel increases, but there is obvious expansion and fracture, and the excess AM aqueous solution is removed. Seal the beaker again and polymerize it in a constant temperature drying oven at 60°C for 24 hours. Soak the second cross-linked network product in the beaker in sufficient deionized water to remove the unreacted monomers to obtain a high-elasticity dual-network polymer particle profile control agent.
[0041] The equivalent tensile deformation of the profile control agent colloid obtained in this embodiment is 345%. When compressed to 90%, the compressive strength can reach 0.6MPa, and the elastic modulus is greater than 2000Pa. The particles are evenly dispersed in water and the 4 Under the condition of mineralization degree of mg / L, it can exist stably for 120 days.
[0042] Example 2
[0043] The first stage, preparation of the first cross-linked network: Take 27.78g of NVP and dissolve it in deionized water. Add 0.840g of MBAA cross-linker and stir and dissolve it with the NVP aqueous solution in a beaker. After uniform dissolution, purge with argon for 15 minutes. After the purge is completed, quickly add 0.040g of VA-044 initiator, seal the beaker, and then put it into a 60°C constant temperature drying oven for polymerization. After 24 hours, take out the beaker from the constant temperature drying oven to obtain the first cross-linked network product after polymerization.
[0044] The second stage, preparation of the second cross-linked network: weigh 53.2g of sodium acrylate and dissolve it in deionized water. Add 0.192g of MBAA cross-linker and stir to dissolve. Purge with argon for 15 minutes, then quickly add 0.371g of VA-044 initiator, and add 3.95g of the prepared first cross-linked network product to the beaker, seal the beaker, and then put it in a 4°C refrigerator to fully swell for 24 hours. Take the beaker out of the refrigerator. In the beaker, the volume of the gel increases, but there is obvious expansion and fracture, and the excess aqueous solution is removed. Seal the beaker again and polymerize it in a constant temperature drying oven at 60°C for 24 hours. Soak the second cross-linked network product in the beaker in sufficient deionized water to remove the unreacted monomers to obtain a high-elasticity dual-network polymer particle profile control agent.
[0045] The equivalent tensile deformation of the profile control agent colloid obtained in this embodiment is 340%. When compressed to 90%, the compressive strength can reach 0.58MPa, and the elastic modulus is greater than 1500Pa. The particles are evenly dispersed in water and the 4 Under the condition of mineralization degree of 100 mg / L, it can exist stably for 100 days.
[0046] Example 3
[0047] The first stage, preparation of the first cross-linked network: 32.29g of N-acryloylmorpholine was taken and dissolved in deionized water. 0.964g of MBAA cross-linker was added and stirred to dissolve. After uniform dissolution, helium was purged for 15 minutes. After the purge, 0.062g of V-501 initiator was quickly added, the beaker was sealed, and then placed in a 60°C constant temperature drying oven for polymerization. After 24 hours, the beaker was taken out of the constant temperature drying oven to obtain the first cross-linked network product after polymerization.
[0048] The second stage, preparation of the second cross-linked network: weigh 39.80g of AM and dissolve it in deionized water. Add 0.138g of MBAA cross-linker and stir to dissolve in a beaker. Purge with helium for 15 minutes, then quickly add 0.259g of V-501 initiator, and add 2.95g of the prepared first cross-linked network product to the beaker, seal the beaker, and then put it in a 4°C refrigerator to fully swell for 24 hours. Take the beaker out of the refrigerator. The volume of the gel in the beaker increases, but there is obvious expansion and fracture, and the excess aqueous solution is removed. Seal the beaker again and polymerize it in a constant temperature drying oven at 60°C for 24 hours. Soak the second cross-linked network product in the beaker in sufficient deionized water to remove the unreacted monomers to obtain a high-elasticity dual-network polymer particle profile control agent.
[0049] The equivalent tensile deformation of the profile control agent colloid obtained in this embodiment is 320%. When compressed to 90%, the compressive strength can reach 0.56MPa, and the elastic modulus is greater than 1800Pa. The particles are evenly dispersed in water and the 4 Under the condition of mineralization degree of 100 mg / L, it can exist stably for 100 days.
[0050] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.
Claims
1. A high elastic double network polymer particle profile control agent, It is characterized in that The high elastic double network polymer particle profile control agent is polymerized by a second cross-linking polymerization monomer, a second cross-linking agent, a second initiator, and a first cross-linking network product; the first cross-linking network product is polymerized by a first cross-linking polymerization monomer, a first cross-linking agent, and a first initiator; The weight ratio of the first cross-linking polymerizable monomer, the first cross-linking agent, and the first initiator is 96-98: 2.5-3.5:0.1-0.2; the weight ratio of the second cross-linking polymerization monomer, the first cross-linking network product, the second cross-linking agent, and the second initiator is 97-99:7.2-7.3:0.3-0.4:0.6-0.
8.
2. The high elastic double network polymer particle profile control agent according to claim 1, It is characterized in that The first cross-linking polymerizable monomer includes at least one of 2-acrylamide-2-methylpropanesulfonic acid, 1-vinyl-2-pyrrolidone, and N-acryloylmorpholine.
3. The high elastic double network polymer particle profile control agent according to claim 1, It is characterized in that The second cross-linking polymerizable monomer includes acrylamide and / or sodium acrylate.
4. The high elastic double network polymer particle profile control agent according to claim 1, It is characterized in that The first cross-linking agent and the second cross-linking agent both include N,N'-methylenebisacrylamide.
5. The high elastic double network polymer particle profile control agent according to claim 1, It is characterized in that The first initiator and the second initiator both include at least one of azobisisobutylamidine hydrochloride, azobisisobutylimidazoline hydrochloride, and azobiscyanovaleric acid.
6. A method for preparing a high elastic double network polymer particle profile control agent, It is characterized in that The following steps are involved: The first cross-linking polymerization monomer, the first cross-linking agent, and the first initiator are polymerized, wherein the weight ratio of the first cross-linking polymerization monomer, the first cross-linking agent, and the first initiator is 96-98: 2.5-3.5: 0.1-0.2, to obtain the first cross-linked network product; The second cross-linking polymerization monomer, the second cross-linking agent, the second initiator and the first cross-linking network product are polymerized, wherein the weight ratio of the second cross-linking polymerization monomer, the second cross-linking agent and the second initiator is 97-99:0.3-0.4:0.6-0.8, to obtain a high elastic double network polymer particle profile control agent.
7. The preparation method according to claim 6, It is characterized in that The first cross-linking polymerization monomer, the first cross-linking agent, and the first initiator are polymerized, including: Take the first cross-linking polymerization monomer and add water to dissolve it, take the first cross-linking agent, and stir and dissolve it with the first cross-linking polymerization monomer aqueous solution in a reaction tank; after uniform dissolution, purge with inert gas for 15 minutes; after the purge is completed, add the first initiator, seal the reaction tank, and then put it into a 60°C constant temperature drying oven for polymerization for 24 hours.
8. The preparation method according to claim 6, It is characterized in that The second cross-linking polymerization monomer, the second cross-linking agent, the second initiator, and the first cross-linking network product are polymerized, comprising: Weigh the second cross-linked polymerization monomer, and add water to dissolve it; put the second cross-linked polymerization monomer aqueous solution in a reaction tank, add the second cross-linking agent and stir to dissolve; purge with inert gas, then add the second initiator, and add the first cross-linked network product to the reaction tank, seal the reaction tank, and then put it in a 4°C refrigerator to fully swell for 24 hours, take out the reaction tank, remove the excess aqueous solution in the reaction tank, seal the reaction tank again, and continue to polymerize in a constant temperature drying oven at 60°C for 24 hours.
9. The preparation method according to claim 7 or 8, It is characterized in that The inert gas includes at least one of nitrogen, helium and argon.
10. The preparation method according to claim 8, It is characterized in that After continuing the polymerization in a constant temperature drying oven at 60° C. for 24 hours, the second cross-linked network product in the reaction tank was immersed in water.