Viscosity-increasable profile control agent and preparation method thereof

A profile control agent and initiator technology, applied in chemical instruments and methods, drilling compositions, etc., can solve the problem that the profile control agent has no viscosity-increasing ability and cannot play a displacing effect, etc., to ensure the strength and expansion performance, The effect of uniform cross-linking structure

Active Publication Date: 2017-06-13
CHINA NAT OFFSHORE OIL CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the technical problem that the existing profile control agent has no viscosity-increasing ability and cannot play a displacement role, and provides a

Method used

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  • Viscosity-increasable profile control agent and preparation method thereof
  • Viscosity-increasable profile control agent and preparation method thereof
  • Viscosity-increasable profile control agent and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0036] Example 1:

[0037]

[0038] Dissolve 30.00g of acrylamide in 94.00g of water, add 3.00g of the main crosslinking agent N,N-dimethylacrylamide and 0.52g of lithium magnesium silicate to the acrylamide monomer aqueous solution in turn, stir until it is clear and add 0.12 g of the secondary crosslinking agent polyethylene glycol diacrylate, mixed uniformly to obtain a monomer solution; while uniformly stirring, nitrogen gas was introduced into the polymerization system to remove oxygen for 30 minutes;

[0039] Weigh 0.06g potassium persulfate and dissolve it in 6.00g water to prepare an initiator solution;

[0040] Mix the monomer solution and the initiator solution, and put the mixed reaction solution in a 40°C water bath to react for 10.0 hours, and raise the temperature to 60°C for 8.0 hours to increase the conversion rate;

[0041] The product obtained in the above steps is crushed, and dried in an oven at 60°C to a constant weight;

[0042] The dried product is pulverized wit...

Example Embodiment

[0043] Example 2

[0044]

[0045] Dissolve 30.00g of acrylamide in 94.00g of water, add 1.80g of the main crosslinking agent N,N-dimethylacrylamide and 2.60g of lithium magnesium silicate to the acrylamide monomer aqueous solution in turn, stir until it is clear and add 0.30 g of the secondary crosslinking agent polyethylene glycol diacrylate, mixed uniformly to obtain a monomer solution;

[0046] Weigh 0.06g potassium persulfate and dissolve it in 6.00g water to prepare an initiator solution;

[0047] Mix the monomer solution and initiator solution, and deoxidize with nitrogen for 30 minutes;

[0048] Put the deoxygenated mixed reaction solution into a 40°C water bath to react for 10.0 hours, and raise the temperature to 60°C for 8.0 hours to increase the conversion rate;

[0049] The product obtained in the above steps is crushed, and dried in an oven at 60°C to a constant weight;

[0050] The dried product is pulverized with a 12000r / min universal pulverizer, and the sieving is divi...

Example Embodiment

[0065] Take Example 3 as an example:

[0066] Dissolve 30.00g of acrylamide in 94.00g of water, add 0.90g of the main crosslinking agent N,N-dimethylacrylamide and 1.12g of lithium magnesium silicate to the acrylamide monomer aqueous solution in turn, stir until it is clear and add 0.21 g of the secondary crosslinking agent polyethylene glycol diacrylate, mixed uniformly to obtain a monomer solution;

[0067] Weigh 0.06g potassium persulfate and dissolve it in 6.00g water to prepare an initiator solution;

[0068] Mix the monomer solution and initiator solution, and deoxidize with nitrogen for 30 minutes;

[0069] Put the deoxygenated mixed reaction solution into a 40°C water bath to react for 10.0 hours, and raise the temperature to 60°C for 8.0 hours to increase the conversion rate;

[0070] The product obtained in the above steps is crushed, and dried in an oven at 60°C to a constant weight;

[0071] The dried product is pulverized with a 12000r / min universal pulverizer, and the siev...

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Abstract

The invention belongs to the technical field of a chemical reagent for oil production, and discloses a viscosity-increasable profile control agent and a preparation method thereof. The profile control agent is obtained through adding functional monomers, inorganic nanometer particles, main crosslinking agents and auxiliary crosslinking agents into an acrylamide monomer water solution, introducing nitrogen gas to remove dissolved oxygen and adding initiators under the water bath condition of 40 to 60 DEG C for polymerization; after the polymerization is completed, pelleting, drying and crushing are performed; a final product is obtained. The prepared profile control agent can realize the continuous viscosity increase on formation water to achieve a certain displacement effect; meanwhile, good anti-salt performance is realized; the water absorption swelling can be generated in the high-concentration salt brine; after the expansion, high intensity is still realized, so that the high seepage layer in an oil deposit can be effectively sealed and plugged; the profile control effect is achieved.

Description

technical field [0001] The invention belongs to the technical field of chemical reagents for oil recovery, in particular, it relates to a pre-crosslinked polymer particle capable of profile control and displacement, namely a viscosity-increasing profile control agent and a preparation method thereof . Background technique [0002] Most of the tertiary oil recovery in my country adopts the water flooding method. After decades of water injection development, the heterogeneity of the reservoir has been strengthened, and the displacement fluid has become increasingly serious along the high-permeability layer or between layers, and the sweep coefficient has been greatly reduced. The increase of water cut and the decrease of oil recovery rate make the cost of energy and equipment in the process of oil recovery continue to rise. The use of profile control agent can effectively reduce water cut and improve oil recovery efficiency. [0003] Common profile control agents are inorgani...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/56C08F220/54C08F220/58C08F226/10C08F222/14C08F226/02C08F220/34C08F2/44C09K8/512C09K8/588
CPCC08F2/44C08F220/56C08F283/065C09K8/512C09K8/588C08F220/54C08F226/10C08F222/102C08F226/02C08F220/34
Inventor 王成胜罗杰陈士佳冯玉军吴晓燕翁大丽易飞黄波胡陈张润芳吕鹏刘观军
Owner CHINA NAT OFFSHORE OIL CORP
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