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Chemical augmented injection system for improving injectivity of oil displacement polymer

A systematic and chemical technology, applied in drilling compositions, chemical instruments and methods, mining fluids, etc., can solve the problems of reducing polymer adsorption, poor stability, weak adsorption force, etc., and achieve the effect of strong adsorption stability

Active Publication Date: 2021-01-12
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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  • Chemical augmented injection system for improving injectivity of oil displacement polymer
  • Chemical augmented injection system for improving injectivity of oil displacement polymer
  • Chemical augmented injection system for improving injectivity of oil displacement polymer

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Embodiment Construction

[0029] The experimental methods used in the following examples are conventional methods unless otherwise specified.

[0030] The materials and reagents used in the following examples can be obtained from commercial sources unless otherwise specified.

[0031] 1. Preparation of chemical injection system

[0032] 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 chemical augmented injection system for improving injectivity of an oil displacement polymer. The chemical augmented injection system consists of an organic silicon sacrificial agent and an auxiliary agent, wherein the molecular formula of the organic silicon sacrificial agent is R1-Si(OR2)3, in the formula, R1 is substituted or unsubstituted C1-C15 alkyl or C2-C15 alkenyl, and R2 is C1-C15 alkyl; the auxiliary agent is a mixture of N-methyldiethanolamine and mahogany petroleum sulfonate or a mixture of N,N,N',N'-tetrakis(2-hydroxypropyl)ethylenediamine and mahogany petroleum sulfonate; the chemical augmented injection system comprises the following components in percentage by mass: 50-90% of an organic silicon sacrificial agent, and 10-50% of an assistant. The chemical augmented injection system provided by the invention is a composite system formed by the organic silicon sacrificial agent and the auxiliary agent thereof, the organic silicon sacrificial agentplays a role in changing reservoir wettability and reducing polymer adsorption, and the auxiliary agent of the sacrificial agent plays a role in cleaning residual crude oil near a wellbore, activating the surface of rock and promoting the reaction of organosilane and the surface of rock.

Description

technical field [0001] The invention relates to a chemical augmentation injection system for improving the injectivity of an oil displacement polymer, and belongs to the field of oil field plugging 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 interactio...

Claims

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Application Information

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IPC IPC(8): C09K8/588E21B43/22
CPCC09K8/588E21B43/16
Inventor 王姗姗张健王秀军赵文森梁丹薛新生胡科康晓东唐恩高靖波
Owner CNOOC TIANJIN BRANCH
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