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A temperature-sensitive copolymer gel profile control and water blocking agent and its preparation method and application

A technology of profile control water shutoff agent and copolymer, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as unrecognizable, influence of plugging effect, failure to form gel, etc., to achieve time controllable, Simple process, easy to inject effects

Active Publication Date: 2018-05-04
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

For example, in the mixed solution of cross-linked polymers, the migration and water dilution and diffusion speed of high-molecular-weight polymers are relatively slow, while the migration and water dilution and diffusion speeds of small-molecule cross-linking agents are relatively fast, and different components in There are differences in the adsorption and retention in the formation, and the chromatographic separation effect caused by this causes the components of the system to be partially or completely separated during the long-term migration underground, which in turn causes the components of the system solution to reach the plugging adjustment target layer. The original composition ratio has changed beyond recognition, unable to form a gel with the strength required by the designed formula, thus affecting the plugging effect
Similarly, the above-mentioned chromatographic separation problem also exists in the mixed solution of monomer cross-linking polymerization, and the gelation reaction, gel strength and plugging effect of cross-linking polymerization caused by chromatographic separation cannot be guaranteed

Method used

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  • A temperature-sensitive copolymer gel profile control and water blocking agent and its preparation method and application
  • A temperature-sensitive copolymer gel profile control and water blocking agent and its preparation method and application
  • A temperature-sensitive copolymer gel profile control and water blocking agent and its preparation method and application

Examples

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Effect test

Embodiment 1

[0045] This embodiment provides a preparation method of a temperature-sensitive copolymer gel profile control and water shutoff agent, which includes the following steps:

[0046] Add 1.18g of acrylamide (AM), 100mL of tetrahydrofuran (THF) and 790μL of γ-methacryloxypropyltrimethoxysilane (MPS) to a 250mL three-neck flask with a magnet, and stir to form a uniform and transparent solution. The molar ratio of AM and MPS is 5:1, and the total content of AM and MPS is 2w / v% of the solution;

[0047] N was introduced into the above solution 2 Remove the oxygen in the solution, and ventilate for 15 minutes, dissolve 20 mg of initiator azobisisobutyronitrile (AIBN) in 1 mL of THF, pour it into the above-mentioned three-necked bottle, and heat the three-necked bottle in an oil bath at 60°C , and then under the protection of nitrogen, magnetically stirred for 24h, then took out the three-necked bottle, terminated the reaction, and obtained a random copolymer solution; the reaction pr...

Embodiment 2

[0057] This embodiment provides a preparation method of a temperature-sensitive copolymer gel profile control and water shutoff agent, which includes the following steps:

[0058] Add 3.7g of acrylamide (AM), 100mL of tetrahydrofuran (THF) and 1.24mL of γ-methacryloxypropyl trimethoxysilane (MPS) into a 250mL three-necked flask with a magnet, and stir to form a uniform and transparent solution. , the molar ratio of AM and MPS is 10:1, and the total content of AM and MPS is 5w / v% of the solution;

[0059] N was introduced into the above solution 2 Remove the oxygen in the solution, and ventilate for 15 minutes, dissolve 50 mg of the initiator azobisisobutyronitrile (AIBN) in 1 mL of THF, pour it into the above-mentioned three-necked bottle, and heat the three-necked bottle in an oil bath at 60°C , and then under the protection of nitrogen, magnetically stirred for 24h, then took out the three-necked flask, terminated the reaction, and obtained a random copolymer solution;

[...

Embodiment 3

[0064] This embodiment provides a preparation method of a temperature-sensitive copolymer gel profile control and water shutoff agent, which includes the following steps:

[0065] Add 1.85g of acrylamide (AM), 50mL of N,N-dimethylformamide (DMF) and 0.62mL of γ-methacryloxypropyltrimethoxysilane (MPS) into a 100mL three-necked flask with a magnet. ), stirred into a uniform and transparent solution, the molar ratio of AM and MPS is 10:1, and the total content of AM and MPS is 5w / v% of the solution;

[0066] N was introduced into the above solution 2 Remove the oxygen in the solution, and ventilate for 15 minutes, dissolve 12.5 mg of initiator azobisisobutyronitrile (AIBN) in 1 mL of DMF, pour it into the above-mentioned three-necked bottle, and place the three-necked bottle in an oil bath at 60°C Heating, then under the protection of nitrogen, magnetically stirred for 24h, then took out the three-necked flask, terminated the reaction, and obtained a random copolymer solution; ...

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Abstract

The invention provides a preparation method of a thermo-sensitive copolymer gel profile control water shutoff agent.The method includes the following steps of dissolving acrylamide and comonomer in organic solvent according to the mole ratio of (5-15):1 to obtain a first reaction solution, introducing protection gas into the first reaction solution to remove oxygen, adding a radical initiator to react for 16-24 hours at a temperature of 60-70 DEG C to obtain an irregular copolymer organic solution, and purifying the irregular copolymer organic solution to obtain the thermo-sensitive copolymer gel profile control water shutoff agent, wherein the total content of acrylamide and comonomer in the first reaction solution is 2-5w / v%, and the mass of the radical initiator accounts for 0.5-2% of the total mass of acrylamide and comonomer.The invention further provides the thermo-sensitive copolymer gel profile control water shutoff agent prepared through the preparation method and application of the thermo-sensitive copolymer gel profile control water shutoff agent in petroleum production.

Description

technical field [0001] The invention belongs to the field of petroleum exploitation, and relates to a temperature-sensitive copolymer gel profile control and water shutoff agent, a preparation method and application thereof. Background technique [0002] Oilfield development generally enters the high water cut stage in the middle and late stages. Due to the original heterogeneity of the reservoir formation and the long-term water flooding, the heterogeneity is further aggravated. The injected water mainly flows into the high permeability zone, forming a water flow dominant channel, thereby reducing Sweep efficiency of injected water. Using cross-linked polymer gel to control the profile control and water shutoff of the dominant water flow channel to improve the sweep efficiency of water flooding and oil recovery is currently the most widely used profile control water shutoff and deep water flow diversion technology at home and abroad. The cross-linked gel involved in this t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F230/08C08J3/075C09K8/512
CPCC08F220/56C08J3/075C08J2333/26C09K8/5083C09K8/512C08F230/08
Inventor 熊春明唐孝芬刘合江如意曾致翚杨立明邵黎明
Owner PETROCHINA CO LTD
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