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

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

CN104087280AActive Publication Date: 2014-10-08CHINA UNIV OF PETROLEUM (EAST CHINA) +1
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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

Examples

Experimental program
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Effect test

Embodiment 1

[0047] A carbon dioxide immiscible flooding suppression gas channeling plugging agent for low permeability reservoirs, which is made of the following raw materials: fine mineral particles, composite crosslinking agent, surfactant, polymer, retarder, oxygen scavenger and Water; each raw material consumption is as follows: the massfraction of fine mineral particles is 1%, the massfraction of composite crosslinking agent is 0.02%, the massfraction of tensio-active agent is 0.5%, the massfraction of polymer is 0.2%, retarder The mass fraction of the oxygen scavenger is 0.1%, the mass fraction of the oxygen scavenger is 0.01%, and the others are 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 and phenolic resin is 0.05. The polymer is po...

Embodiment 2

[0051] A carbon dioxide immiscible flooding suppression gas channeling plugging agent for low permeability reservoirs, which is made of the following raw materials: fine mineral particles, composite crosslinking agent, surfactant, polymer, retarder, oxygen scavenger and Water; each raw material consumption is as follows: the massfraction of fine mineral particles is 2%, the massfraction of composite crosslinking agent is 0.01%, the massfraction of tensio-active agent is 0.1%, the massfraction of polymer is 0.3%, retarder The mass fraction of the oxygen scavenger is 0.04%, the mass fraction of the oxygen scavenger is 0.01%, and 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 mesh. The composite crosslinking agent is a mixture of chromium acetate and phenolic resin, and the weight ratio of chromium acetate and phenolic resin is 0.2. The polymer is poly...

Embodiment 3

[0056] A carbon dioxide immiscible flooding inhibitor and channeling plugging agent for low-permeability oil reservoirs, which is made of the following raw materials: composite crosslinking agent, surfactant, polymer, retarder, oxygen scavenger and water; each raw material Consumption is as follows: the massfraction of composite crosslinking agent is 0.02%, the massfraction of tensio-active agent is 0.3%, the massfraction of polymer is 0.2%, the massfraction of setting retarder is 0.06%, the massfraction of oxygen scavenger is 0.01%, the others are water, and the sum of the mass fractions of each component is 100%.

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

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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

Patent Timeline
08 Oct 2014
Publication
CN104087280A
IPC
C09K8/594; C09K8/512; E21B43/16
CPC
C09K8/512; C09K8/594
Inventors
蒲春生; 何延龙