Blocking system and blocking method for channeling inhibition in carbon dioxide non-miscible flooding of low permeability reservoir

A carbon dioxide and immiscible flooding technology, applied in chemical instruments and methods, production fluids, earthwork drilling and production, etc., can solve the problems of limited plugging range, inability to inject, and low strength, so as to increase the swept volume and suppress local breakthrough , Improve the effect of mechanical strength

Active Publication Date: 2014-10-08
CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the large differences in the pore-throat structure characteristics of low-permeability reservoirs, mainly fine pores and thin throats, and large specific surface area, the surface action, microcapillary action, and electrochemical action on the solid-liquid interface are enhanced, showing non-Darcy Due to the characteristics of percolation, there is a pressure difference at start-up production, which leads to the phenomenon of "high injection pressure and no injection" in the early stage of carbon dioxide immiscible gas flooding development. Heterogeneity and existing micro-cracks can easily lead to "gas channeling" during carbon dioxide immiscible gas flooding
[0003] However, immiscible gas flooding with carbon dioxide in low-permeability reservoirs will also face the following problems: on the one hand, low-permeability reservoirs have high gas injection pressure at the initial stage of production, and with the increase of steam injection pressure, local high pressure is likely to form, resulting in immiscible Carbon dioxide forms a channeling channel prem

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  • Blocking system and blocking method for channeling inhibition in carbon dioxide non-miscible flooding of low permeability reservoir
  • Blocking system and blocking method for channeling inhibition in carbon dioxide non-miscible flooding of low permeability reservoir
  • Blocking system and blocking method for channeling inhibition in carbon dioxide non-miscible flooding of low permeability reservoir

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Example Embodiment

[0046] Example 1

[0047] A low-permeability oil reservoir carbon dioxide immiscible flooding suppressing gas channeling plugging agent, which is made of the following raw materials: fine mineral particles, composite crosslinking agent, surfactant, polymer, retarder, deoxidizer and Water; the amount of each raw material is as follows: the mass fraction of fine mineral particles is 1%, the mass fraction of composite cross-linking agent is 0.02%, the mass fraction of surfactant is 0.5%, the mass fraction of polymer is 0.2%, retarder The mass fraction of is 0.1%, the mass fraction of oxygen scavenger is 0.01%, the rest is water, and the sum of the mass fractions of each component is 100%.

[0048] Among them, the fine mineral particles are wollastonite, and the particle size is 360 mesh. The composite crosslinking agent is a mixture of chromium acetate and phenolic resin, and the weight ratio of chromium acetate to phenolic resin is 0.05. The polymer is polyacrylamide with a molecul...

Example Embodiment

[0050] Example 2

[0051] A low-permeability oil reservoir carbon dioxide immiscible flooding suppressing gas channeling plugging agent, which is made of the following raw materials: fine mineral particles, composite crosslinking agent, surfactant, polymer, retarder, deoxidizer and Water; the amount of each raw material is as follows: the mass fraction of fine mineral particles is 2%, the mass fraction of composite crosslinking agent is 0.01%, the mass fraction of surfactant is 0.1%, the mass fraction of polymer is 0.3%, retarder The mass fraction of is 0.04%, the mass fraction of the oxygen scavenger is 0.01%, the others are water, and the sum of the mass fractions of each component is 100%.

[0052] Among them, the fine mineral particles are serpentine, and the particle size is 360 meshes. The composite crosslinking agent is a mixture of chromium acetate and phenolic resin, and the weight ratio of chromium acetate to phenolic resin is 0.2. The polymer is polyacrylamide with a m...

Example Embodiment

[0055] Example 3

[0056] A low-permeability oil reservoir carbon dioxide immiscible flooding and channeling inhibiting plugging agent, which is made of the following raw materials: composite crosslinking agent, surfactant, polymer, retarder, deoxidizer and water; each raw material The dosage is as follows: the mass fraction of composite crosslinking agent is 0.02%, the mass fraction of surfactant is 0.3%, the mass fraction of polymer is 0.2%, the mass fraction of retarder is 0.06%, and the mass fraction of oxygen scavenger is 0.01%, the others are water, the sum of the mass fractions of each component is 100%.

[0057] Among them, the composite crosslinking agent is a mixture of chromium acetate and phenolic resin, and the weight ratio of chromium acetate to phenolic resin is 0.1. The polymer is polyacrylamide with a molecular weight ranging from 12 million to 16 million. The retarder is sodium tartrate. The oxygen scavenger is sodium sulfite. The water is tap water. The surf...

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Abstract

The invention discloses a blocking system and a blocking method for channeling inhibition in carbon dioxide non-miscible flooding of a low permeability reservoir. The system is mainly prepared from the following raw materials in percentage by weight: 1%-2% of fine mineral particles, 0.2%-0.3% of polymer, 0.01%-0.02% of compound crosslinking agent, 0.04%-0.1% of retarder, 0.01% of deoxidant, 0.1%-0.5% of surfactant and the balance of water. By virtue of monitoring the steam injection pressure of a wellhead in real time and adjusting the system, graded control of high-pressure steam injection, 'gas channeling' and 'escape channeling' processes in the carbon dioxide non-miscible flooding is realized and the development effect of the carbon dioxide non-miscible flooding of the low permeability reservoir is improved.

Description

technical field [0001] The invention specifically relates to a carbon dioxide immiscible flooding suppression and plugging system and a plugging method for low-permeability oil reservoirs. Background technique [0002] With the continuous development of conventional oil and gas resources, the replacement of complex oil and gas resources is an important supplement to the world's oil and gas resources, and the development of low permeability reservoirs in the development of complex oil and gas resources is an important part of it. Carbon dioxide immiscible gas flooding is an effective and widely used development technology for enhancing oil recovery in low permeability oilfields. However, due to the large differences in the pore-throat structure characteristics of low-permeability reservoirs, mainly fine pores and thin throats, and large specific surface area, the surface action, microcapillary action, and electrochemical action on the solid-liquid interface are enhanced, show...

Claims

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Application Information

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IPC IPC(8): C09K8/594C09K8/512E21B43/16
CPCC09K8/512C09K8/594
Inventor 蒲春生何延龙吴飞鹏张磊谷潇雨郑黎明
Owner CHINA UNIV OF PETROLEUM (EAST CHINA)
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