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A method of "plugging/regulating/flooding" integration to enhance oil recovery

A technology for oil recovery and oil reservoirs, applied in chemical instruments and methods, production fluids, earth drilling and production, etc., can solve problems such as difficulty in advancing oil displacement agents, reduce microscopic sweep volume of oil displacement agents, blockage, etc.

Active Publication Date: 2021-01-26
NORTHEAST GASOLINEEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the polymer solution enters the smaller pores, it will cause clogging, making it difficult for subsequent oil displacement agents to advance deep into the pores, and ultimately reduce the microscopic swept volume of the oil displacement agent

Method used

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  • A method of "plugging/regulating/flooding" integration to enhance oil recovery
  • A method of "plugging/regulating/flooding" integration to enhance oil recovery
  • A method of "plugging/regulating/flooding" integration to enhance oil recovery

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Effect test

Embodiment 1

[0014] A "plugging / modulation / flooding" integrated method for enhancing oil recovery, comprising the following steps:

[0015] Step 1. Composite gel is prepared by injecting water into the target oil reservoir to prepare composite gel. The composition mass percentage is: 2.5% polyaluminum chloride, 4.5% acrylamide, 0.9% urea, 0.3% ammonium persulfate and 0.3% N , N-methylenebisacrylamide, the initial viscosity of the composite gel is lower than 5mPa. s, the viscosity after gelling exceeds 10×10 4 mPa. s;

[0016] Step 2: Prepare the "polymer microsphere / high-efficiency oil displacement agent" composite system, and use the injection water of the target reservoir to prepare the "polymer microsphere / high-efficiency oil displacement agent" composite system. The components are composed of: the polymer microsphere material is Hydrophobic association polymer gel, the concentration of microspheres is 0.3%, the initial particle size of microspheres is 2.75 μm, and the median particl...

Embodiment 2

[0020] A "plugging / modulation / flooding" integrated method for enhancing oil recovery, comprising the following steps:

[0021] Step 1. Composite gel is prepared by injecting water into the target oil reservoir to prepare composite gel. The composition mass percentage is: 1.5% polyaluminum chloride, 3.0% acrylamide, 0.6% urea, 0.2% ammonium persulfate and 0.2%% N, N-methylenebisacrylamide, the initial viscosity of the composite gel is lower than 5mPa. s, the viscosity after gelling exceeds 10×10 4 mPa. s;

[0022]Step 2: Prepare the "polymer microsphere / high-efficiency oil displacement agent" composite system, and use the injection water of the target reservoir to prepare the "polymer microsphere / high-efficiency oil displacement agent" composite system. The components are composed of: the polymer microsphere material is Hydrophobic association polymer gel, the concentration of microspheres is 0.2%, the initial particle size of microspheres is 1.00 μm, and the median particle...

Embodiment 3

[0026] A "plugging / modulation / flooding" integrated method for enhancing oil recovery, comprising the following steps:

[0027] Step 1. Composite gel is prepared by injecting water into the target oil reservoir to prepare composite gel. The composition mass percentage is: 3.5% polyaluminum chloride, 6.0% acrylamide, 1.2% urea, 0.4% ammonium persulfate and 0.4% N , N-methylenebisacrylamide, the initial viscosity of the composite gel is lower than 5mPa. s, the viscosity after gelling exceeds 10×10 4 mPa. s;

[0028] Step 2: Prepare the "polymer microsphere / high-efficiency oil displacement agent" composite system, and use the injection water of the target reservoir to prepare the "polymer microsphere / high-efficiency oil displacement agent" composite system. The components are composed of: the polymer microsphere material is Hydrophobic association polymer gel, the concentration of microspheres is 0.4%, the initial particle size of microspheres is 4.50 μm, and the median particl...

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Abstract

The invention belongs to the technical field of oil recovery, and in particular relates to a method for integrated "plugging / regulation / flooding" to enhance oil reservoir recovery. 1. Composite gel, 2.5% polyaluminium urea, 0.3% ammonium persulfate and 0.3% N,N-methylenebisacrylamide; 2. Prepare the "polymer microsphere / high-efficiency oil displacement agent" composite system, and the polymer microsphere material is hydrophobic association polymer coagulation Gel, microsphere concentration 0.3%, microsphere initial particle size 2.7 μm, median particle size 2.00 μm, median particle size 18.92 μm, expansion multiple 10; 3. Inject the composite gel into the dominant channel of the reservoir, and wait for 24 hours to set. Slug size: 0.05PV for the main slug, 0.025PV for the replacement slug; inject the "polymer microsphere / high-efficiency oil displacement agent" composite system from the water well into the reservoir, the slug size: 0.1PV; follow-up water flooding until the water cut reaches 98%.

Description

Technical field: [0001] The invention belongs to the technical field of oil recovery, and in particular relates to a method for enhancing oil recovery by integrating "plugging / regulation / flooding". Background technique: [0002] At present, the production of major oilfields in China has entered the development stage of medium-high water cut. The long-term water injection and the high-intensity scour of the produced fluid have caused the destruction of the rock structure of the reservoir, and the formation of ultra-high permeability bands or dominant channels between injection and production wells has further aggravated the reservoir pressure. Due to the heterogeneity of the layer, the injected water and even the polymer solution rush along the dominant channel, which seriously affects the development effect of water flooding and polymer flooding. At present, the management of superior channels has become a technical problem that must be solved first to improve oil recovery. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/20E21B33/134C09K8/506C09K8/516C09K8/52C09K8/584
Inventor 卢祥国刘义刚张云宝李彦阅刘进祥谢坤曹伟佳曹豹
Owner NORTHEAST GASOLINEEUM UNIV
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