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Profile control agent for water injection well, and preparation method and application thereof

A profile control agent and technology for water injection wells, applied in chemical instruments and methods, drilling compositions, etc., can solve problems such as short validity period, achieve enhanced anti-scourability, excellent gel strength and elasticity, and improve oil recovery rate effect

Active Publication Date: 2013-08-28
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the complex has the disadvantage of a relatively short shelf life

Method used

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  • Profile control agent for water injection well, and preparation method and application thereof
  • Profile control agent for water injection well, and preparation method and application thereof
  • Profile control agent for water injection well, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] (1) Preparation of profile control agent

[0048]The new composite profile control agent is composed of 3 parts of acrylamide, 3 parts of inorganic sodium bentonite, 0.1 part of modified polypropylene fiber JYQ-P (fiber lengths are 2mm, 3mm, 4mm, 5mm, 6mm, fiber diameters are 3μm, 4μm , 5μm, 6μm, 7μm, moisture regain 4.2~4.5, 0.91g / cm 3 , and 93.7 parts of tap water were added to a jar with a stopper, stirred for 15 minutes to dissolve completely, and then 0.1 part of ammonium persulfate, 0.1 part of cross-linking agent N, N-methylenebisacrylamide or N- Hydroxyacrylamide, a new composite profile control agent.

[0049] (2) Determination of gel viscosity

[0050] Take samples in the laboratory and place them in jars with stoppers, and observe the gelation in a constant temperature drying oven at 50°C. The experiment found that the profile control agent formed after 15 hours was initially gelled, and the measured apparent viscosities were: 9800mPa.s, 9500mPa.s, 12000mP...

Embodiment 2

[0059] (1) Preparation of profile control agent

[0060] The new composite profile control agent is composed of 3 parts of acrylamide, 4 parts of inorganic sodium bentonite, 0.15 parts of modified polypropylene fiber JYQ-P (fiber lengths are 2mm, 3mm, 4mm, 5mm, 6mm, fiber diameters are 3μm, 4μm , 5 μm, 6 μm, 7 μm, moisture regain 4.2-4.5 and 92.5 parts of tap water, add to a jar with a stopper, stir for 15 minutes to completely dissolve, then add 0.15 parts of ammonium persulfate, 0.20 parts of N, N-sub- Methylbisacrylamide or N-methylolacrylamide to obtain a new composite profile control agent.

[0061] (2) Determination of gel viscosity

[0062] Take the sample and put it in a jar with a stopper in the laboratory, and observe the gelation in a 50°C constant temperature drying oven. The experiment found that the profile control agent formed after 12 hours was initially gelled, 11000mPa.s, 10000mPa.s, 13000mPa. s, 12500mPa.s, 17000mPa.s, 16000mPa.s, 15000mPa.s, 13800mPa.s, 1...

Embodiment 3

[0070] (1) Preparation of profile control agent

[0071] The new composite profile control agent is composed of 4 parts of acrylamide, 4 parts of inorganic sodium bentonite, 0.15 parts of modified polypropylene fiber JYQ-P (fiber lengths are 2mm, 3mm, 4mm, 5mm, 6mm, fiber diameters are 3μm, 4μm , 5 μm, 6 μm, 7 μm, moisture regain 4.2 ~ 4.5) and 91.55 parts of tap water, added to a jar with a stopper, stirred for 15 minutes to completely dissolve, then added 0.15 parts of ammonium persulfate, 0.15 parts of N, N- Methylenebisacrylamide or N-methylolacrylamide to obtain a new composite profile control agent.

[0072] (2) Determination of gel viscosity

[0073] Take the sample and put it in a jar with a stopper in the laboratory, and observe the gelation in a constant temperature drying oven at 50°C. The experiment found that the profile control agent formed after 10 hours was initially gelled at 12000mPa.s, 10000mPa.s, and 14000mPa.s , 13000mPa.s, 18800mPa.s, 17500mPa.s, 16300m...

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Abstract

The invention provides a profile control agent for a water injection well and a preparation method and application thereof. The profile control agent is prepared from the following components by weight: 3 to 4 parts of acrylamide, 3 to 5 parts of bentonite, 0.1 to 0.2 part of a modified polypropylene fiber, 0.1 to 0.2 part of an initiator and 0.1 to 0.3 part of a cross-linking agent, with the balance being water, wherein the total weight of the components is 100 parts. The profile control agent for the water injection well has viscoelasticity and anti-shearing performance, overcomes the defects of great brittleness and no scouring resistance of an inorganic gel profile control agent prepared from single inorganic bentonite and has the excellent characteristics of temperature resistance, scouring resistance, a long profile control period and the like.

Description

technical field [0001] The invention relates to the technical field of oil recovery in the process of oil field development, in particular to a water injection well profile control agent, a preparation method and an application thereof. Background technique [0002] In the water flooding production of oilfields, after decades of water injection development, the heterogeneity of the reservoir has further deteriorated, and medium and high permeability layers have appeared in some parts of the oil layer, resulting in a large amount of ineffective circulation of injected water, reduced recovery, and water injection. less effective. In order to improve the development effect of water flooding, in terms of engineering technology, layered water injection, water shutoff (mechanical sealing and chemical water shutoff) and profile control have been developed. Especially in terms of chemical water plugging and profile control, various plugging agents have been developed in recent deca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/42C09K8/588C08F120/56C08F2/44
Inventor 刘平德魏发林张松熊春明
Owner PETROCHINA CO LTD
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