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Temporary blocking agent, composite blockage removal agent and combined blockage removal method using temporary blocking agent and composite blockage removal agent

A technology of composite plugging agent and temporary plugging agent, which is applied in the direction of chemical instruments and methods, earthwork drilling and production, and drilling compositions, etc., which can solve blockage, difficulty in polymer injection, and full plugging removal of blocked strata by plugging agent. question

Inactive Publication Date: 2013-05-22
黑龙江龙之润环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the difficulty of polymer injection due to the clogging of polymers in porous media during polymer flooding, and if the plugging agent is used directly, it may occur that the plugging agent preferentially enters the unplugged formation and cannot make the plugged formation fully For the technical problem of plugging removal, a temporary plugging agent, a composite plugging removal agent and a method for composite plugging removal using the temporary plugging agent and the composite plugging removal agent are provided

Method used

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  • Temporary blocking agent, composite blockage removal agent and combined blockage removal method using temporary blocking agent and composite blockage removal agent
  • Temporary blocking agent, composite blockage removal agent and combined blockage removal method using temporary blocking agent and composite blockage removal agent
  • Temporary blocking agent, composite blockage removal agent and combined blockage removal method using temporary blocking agent and composite blockage removal agent

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specific Embodiment approach 1

[0025] Specific embodiment one: The temporary blocking agent of this embodiment is composed of 1-11 parts of quaternary ammonium salt surfactant and 1-2 parts of freezing accelerator according to the mass parts, and the described quaternary ammonium salt surfactant is dodecyl Two of trimethylammonium chloride, cetyltrimethylammonium chloride, octadecyltrimethylammonium chloride and behenyltrimethylammonium chloride; The agent is sodium citrate, KCl, KBr, sodium 2-hydroxypropane-1,2,3-tricarboxylate, sodium o-hydroxybenzoate or NH 4 Cl.

specific Embodiment approach 2

[0026] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the temporary blocking agent is composed of 6 parts of quaternary ammonium salt surfactant and 1.5 parts of freezing accelerator in parts by mass. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: the temporary blocking agent of this embodiment is composed of 1-9 parts of quaternary ammonium salt surfactant, 1.5-2.5 parts of betaine surfactant and 1-2 parts of freezing accelerator according to the mass parts. The ammonium salt surfactant is dodecyltrimethylammonium chloride, cetyltrimethylammonium chloride, octadecyltrimethylammonium chloride or behenyltrimethylammonium chloride ; The betaine surfactant is octadecyl betaine; the freezing agent is sodium citrate, KCl, KBr, 2-hydroxypropane-1,2,3-sodium tricarboxylate, o- Sodium Hydroxybenzoate or NH 4 Cl.

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Abstract

The invention discloses a temporary blocking agent, a composite blockage removal agent and a combined blockage removal method using the temporary blocking agent and the composite blockage removal agent, relating to temporary blocking agents, composite blockage removal agents and combined blockage removal methods. The temporary blocking agent, the composite blockage removal agent and the combined blockage removal method are used for solving the technical problems in a polymer flooding process that the difficulty in polymer injection is caused due to the fact that a polymer is subjected to blockage in a porous medium, and when the blockage removal agent is used directly, the blockage removal agent can preferentially enter unblocked stratums and cannot sufficiently unblock blocked stratums are solved. The temporary blocking agent consists of a surfactant and a freeze promoter. The composite blockage removal agent consists of a host and an initiator. According to the combined blockage removal method, the unblocked stratums are blocked in advance by using the temporary blocking agent so as to enable more subsequently-injected large-dose low-viscosity blockage removal agent to selectively enter the stratums required for being unblocked, the well shut-in is carried out for 2-3 days so as to enable the blockage removal agent and blockages to react fully, and then, the aim of unblocking is achieved.

Description

technical field [0001] The invention relates to a temporary plugging agent, a composite plugging removal agent and a composite plugging removal method. Background technique [0002] During the popularization and application of polymer flooding in a large area, many polymer injection wells have encountered the problem of difficult injection, which is mainly manifested in the increase of injection pressure, and the injection cannot be completed according to the ratio, and some wells even stop injection, which seriously affects the effect of polymer flooding and Comprehensive economic benefits. Ordinary hydraulic fracturing and chemical plugging removal measures, although to a certain extent, alleviate the contradiction between polymer injection failure and injection pressure rise, but there are problems of low injection rate and short validity period. Statistics in recent years show that both fracturing and chemical plugging removal effects are poor, and neither can meet the ...

Claims

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Application Information

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IPC IPC(8): C09K8/44C09K8/524E21B33/13E21B37/06
Inventor 鲍洪玉刘永涛邢平韩莉华侯凤芹赵金姝
Owner 黑龙江龙之润环保工程有限公司
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