Selective water-plugging agent for super-molecular oil well and preparation method thereof

A molecular oil well and selectivity technology, applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve the problem of poor oil-water selectivity

Active Publication Date: 2015-05-06
QINGDAO UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After the polymer is adsorbed in the hydrophilic formation of the oil well, it can generate a supermolecule through the self-assembly of the side chain β-cyclodextrin and the benzene ring, so as to achieve the purpose of selective spontaneous water shutoff of the oil well and overcome the previous water shutoff agent. The problem of poor oil-water selectivity

Method used

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  • Selective water-plugging agent for super-molecular oil well and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0006] (1) Add 0.45 mol of refined β-cyclodextrin into a reaction vessel with a stirring device, and add 5.0 mol of ethanol. After mixing thoroughly, keep the temperature at 65°C for 0.5 h to form a uniform solution, and pour it into the solution with a dropping funnel. Slowly add 0.4mol epichlorohydrin dropwise to the reaction vessel, after dropping, raise the temperature of the reaction solution to 70°C-75°C, react for 3h, add 0.5mol 1-chloromethylbenzene after the reaction, and mix thoroughly;

[0007] (2) Add 0.2mol of diethylenetriamine into a reaction vessel with a stirring device, add 3.0mol of ethanol, raise the temperature to 70°C, slowly add 0.2mol of epichlorohydrin with a dropping funnel, and react at 70°C for 3h ;

[0008] (3) Slowly drop the mixture obtained in step (1) into the mixture obtained in step (2) using a dropping funnel. After the drop is complete, heat up to 90°C to 95°C and react for 4 hours to obtain the product. The average molecular weight of the...

Embodiment 2

[0010] (1) Add 0.5mol of refined β-cyclodextrin into a reaction vessel with a stirring device, add 5.0mol of ethanol, mix thoroughly, keep the temperature at 65°C for 0.5h to form a uniform solution, and pour it into the reaction vessel with a dropping funnel Slowly add 0.5 mol of epichlorohydrin into the solution, after dropping, the temperature of the reaction solution is raised to 70°C to 75°C, and react for 3.0 hours. After the reaction, add 0.5mol of 1-chloromethylbenzene and mix thoroughly;

[0011] (2) Add 0.3mol of diethylenetriamine into a reaction vessel with a stirring device, add 3.0mol of ethanol, heat up to 70°C, slowly add 0.3mol of epichlorohydrin with a dropping funnel, dropwise, and react at 70°C 3h;

[0012] (3) Slowly drop the mixture obtained in step (1) into the mixture obtained in step (2) using a dropping funnel. After the drop is complete, heat up to 90°C to 95°C and react for 4 hours to obtain the product. The average molecular weight of the product ...

Embodiment 3

[0014] (1) Add 0.55 mol of refined β-cyclodextrin into a reaction vessel with a stirring device, add 5.0 mol of ethanol, mix thoroughly, and keep the temperature at 65°C for 0.5h to form a uniform solution. Slowly add 0.6 mol of epichlorohydrin into the reaction vessel dropwise with a dropping funnel, after dropping, raise the temperature to 70°C-75°C, react for 3.0h, add 0.5mol of 1-chloromethylbenzene after the reaction, and mix thoroughly;

[0015] (2) Add 0.4mol of diethylenetriamine into a reaction vessel with a stirring device, add 3.0mol of ethanol, heat up to 70°C, slowly add 0.4mol of epichlorohydrin with a dropping funnel, dropwise, and react at 70°C 3.0h;

[0016] (3) Slowly add the mixture obtained in step (1) dropwise to the mixture obtained in step (2) with a dropping funnel, after the drop is complete, heat up to 90°C to 95°C and react for 4 hours to obtain the product. The average molecular weight of the product measured by mass spectrometry is about 21370, an...

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Abstract

The invention relates to a selective water-plugging agent for a super-molecular oil well and a preparation method thereof. According to the water-plugging agent, a super-molecular structure is produced by utilizing self-assembly of a self-side chain group in a hydrophilic stratum of the oil well, so that the aim of selective water plugging of oil-water is fulfilled. According to the water-plugging agent, the problem of poor selectivity of the water-plugging agent is solved, the water content of crude oil produced by the oil well can be greatly reduced, the crude oil extraction efficiency is improved, and the crude oil extraction cost is reduced.

Description

technical field [0001] The invention belongs to the field of oil recovery additives for oil fields, and in particular relates to a selective water shutoff agent for oil wells and a preparation method thereof. Background technique [0002] In recent years, most oilfields in my country have entered the mid-to-late stage of development, and the comprehensive water cut has risen sharply. The comprehensive water cut of most oil reservoirs has exceeded 90%, which seriously affects the normal production of oilfields. Water production from oil wells has become a serious problem for water injection development oilfields. question. For this reason, oil wells usually have to be shut off to reduce their water cut. The essence of water plugging is to change the flow direction of water in the formation. Through water blocking, the energy of the formation can be maintained, and the sweep coefficient of injected water or other oil displacement agents can be improved, thereby improving the r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G81/00C08B37/16C09K8/50
Inventor 麻金海孔淑玲
Owner QINGDAO UNIV
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