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Method for improving injectivity of oil-displacing polymer

An oil-displacing polymer and injectable technology, applied in drilling compositions, chemical instruments and methods, and earth-moving drilling, etc., can solve the problems of reducing polymer adsorption, weak adsorption force, poor stability, etc., and achieve stable adsorption. strong effect

Active Publication Date: 2021-01-08
CNOOC TIANJIN BRANCH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The current research on sacrificial agents mainly uses surfactants to produce competitive adsorption with polymers to reduce the adsorption of polymers in near-wellbore areas. Because surfactants are mainly adsorbed on the formation surface through electrostatic interaction, it belongs to physical adsorption. Adsorption weak, poor stability

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  • Method for improving injectivity of oil-displacing polymer
  • Method for improving injectivity of oil-displacing polymer
  • Method for improving injectivity of oil-displacing polymer

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Embodiment Construction

[0031] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0032] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0033] 1. Preparation of chemical injection system

[0034] The organosilicon sacrificial agent used in this embodiment is triethoxyoctylsilane, and the auxiliary agent is a mixture of N-methyldiethanolamine and petroleum sulfonate. In the auxiliary agent, the mass percent concentration of N-methyldiethanolamine is 90%, the mass percent concentration of petroleum sulfonate is 10%. Compound the organosilicon sacrificial agent and the auxiliary agent according to the mass ratio of 70:30. The specific steps are: first prepare the aqueous solution of the auxiliary agent, wherein the mass fraction of N-methyldiethanolamine is 9%, the mass fraction of petroleum sulfonate The fraction is 1%, and then triethoxyoctylsilane is added to ...

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Abstract

The invention discloses a method for improving the injectivity of an oil-displacing polymer. The method comprises the following steps: injecting a chemical augmented injection system into a near wellbore area as a front slug, then injecting the oil-displacing polymer for polymer flooding, and finally performing water flooding, so that the adsorption amount of the oil-displacing polymer in the nearwellbore area is reduced, and the injectivity of the oil-displacing polymer is improved; and the chemical augmented injection system is composed of an organosilicon sacrificial agent and an auxiliaryagent; the molecular formula of the organosilicon sacrificial agent is R1-Si (OR2)3, and the auxiliary agent is a mixture of N-methyldiethanolamine and petroleum sulfonate OR a mixture of ethylenediamine-N, N, N', N'-tetra-2-ol and petroleum sulfonate. The chemical augmented injection system adopted by the method is a composite system formed by the organosilicon sacrificial agent and the auxiliary agent thereof, wherein the organosilicon sacrificial agent plays a role in changing the reservoir wettability and reducing the polymer adsorption, and the sacrificial agent auxiliary agent plays a role in cleaning residual crude oil in the near wellbore area, activating the rock surface and promoting the reaction between the organosilicon and the rock surface.

Description

technical field [0001] The invention relates to a method for improving the injectivity of an oil displacement polymer, which belongs to the field of oil field plug removal. Background technique [0002] As one of the important means to stabilize or increase production in oilfield development, polymer flooding has been widely used in oilfields at home and abroad. With the continuous injection of polymer, some wells will have problems such as high injection pressure and wellbore blockage, resulting in a decrease in injection rate and affecting the effect of polymer flooding. For the occurrence of the above situations, most oilfields use plugging removal agent injection to remove plugging. However, most of the plugging removal has a short effective period and incomplete plugging removal, which affects the subsequent injection effect of polymers. If a chemical stimulation injection system can be injected before polymer injection, the interaction between the polymer and the rese...

Claims

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Application Information

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IPC IPC(8): E21B43/22E21B43/20C09K8/588
CPCE21B43/16E21B43/20C09K8/588
Inventor 王姗姗薛新生梁丹赵文森胡科王秀军张健康晓东朱玥珺李先杰杜虹
Owner CNOOC TIANJIN BRANCH
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