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Method for improving oil reservoir recovery rate by integration of plugging, regulating and flooding

A recovery factor and oil reservoir technology, applied in chemical instruments and methods, production fluids, earthwork drilling, etc., can solve problems such as difficulty in propelling oil displacement agents, reducing the microscopic sweep volume of oil displacement agents, clogging, etc.

Active Publication Date: 2019-06-21
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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  • Method for improving oil reservoir recovery rate by integration of plugging, regulating and flooding
  • Method for improving oil reservoir recovery rate by integration of plugging, regulating and flooding
  • Method for improving oil reservoir recovery rate by integration of plugging, regulating and flooding

Examples

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Embodiment 1

[0018] An integrated method of "plugging / adjusting / flooding" to improve oil reservoir recovery, including the following steps:

[0019] Step 1. Prepare a composite gel. The composite gel is prepared by injecting water from the target reservoir. Its composition mass percentage is: 2.5% polyaluminum chloride, 4.5% acrylamide, 0.9% urea, 0.3% ammonium persulfate and 0.3% N ,N-Methylene bisacrylamide, the initial viscosity of the composite gel is less than 5mPa·s, and the viscosity after gelation exceeds 10×10 4 mPa·s;

[0020] Step 2. Prepare the composite system of "polymer microspheres / high-efficiency oil-displacing agent", and prepare the composite system of "polymer microspheres / high-efficiency oil-displacing agent" by injecting water from the target reservoir. The composition of each component is as follows: Hydrophobic associating polymer gel, the concentration of microspheres is 0.3%, the initial particle size of the microspheres is 2.75μm, and the median particle size is 2.00μ...

Embodiment 2

[0024] An integrated method of "plugging / adjusting / flooding" to improve oil reservoir recovery, including the following steps:

[0025] Step 1. Prepare a composite gel. The composite gel is prepared by injecting water from the target reservoir. Its 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 less than 5mPa·s, and the viscosity after gelation is more than 10×10 4 mPa·s;

[0026] Step 2. Prepare the composite system of "polymer microspheres / high-efficiency oil-displacing agent", and prepare the composite system of "polymer microspheres / high-efficiency oil-displacing agent" by injecting water from the target reservoir. The composition of each component is: the material of polymer microspheres is Hydrophobic associating polymer gel, the concentration of microspheres is 0.2%%, the initial particle size of the microspheres is 1.00μm, and...

Embodiment 3

[0030] An integrated method of "plugging / adjusting / flooding" to improve oil reservoir recovery, including the following steps:

[0031] Step 1. Prepare the composite gel. The composite gel is prepared by injecting water from the target reservoir. Its composition mass percentage is: 3.5% polyaluminum chloride, 6.0% acrylamide, 1.2% urea, 0.4% ammonium persulfate and 0.4% N ,N-Methylene bisacrylamide, the initial viscosity of the composite gel is less than 5mPa·s, and the viscosity after gelation exceeds 10×10 4 mPa·s;

[0032] Step 2. Prepare the composite system of "polymer microspheres / high-efficiency oil-displacing agent", and prepare the composite system of "polymer microspheres / high-efficiency oil-displacing agent" by injecting water from the target reservoir. Each component is composed of: Hydrophobic associating polymer gel, the concentration of microspheres is 0.4%, the initial particle size of the microspheres is 4.50μm, and the median particle size is 2.00μm. After hydrati...

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Abstract

The invention belongs to the technical field of oil extraction, and particularly relates to a method for improving the oil reservoir recovery rate by integration of plugging, regulating and flooding,which comprises the following steps: 1, preparing composite gel, 2.5% of polyaluminum chloride, 4.5% of acrylamide, 0.9% of urea, 0.3% of ammonium persulfate and 0.3% of N, N-methylenebisacrylamide; 2, preparing a polymer microsphere / efficient oil displacement agent composite system, wherein a polymer microsphere material is hydrophobic association polymer gel, the microsphere concentration is 0.3%, the microsphere initial particle size is 2.7 [mu]m, the particle size median is 2.00 [mu]m, the particle size median is 18.92 [mu]m, and the expansion multiple is 10; and 3, injecting the compositegel into a dominant channel of an oil reservoir, waiting for gelling for 24 h, wherein the slug size is as follows: a main slug of 0.05 PV and a displacement slug of 0.025 PV; injecting the polymer microsphere / efficient oil displacement agent composite system into an oil reservoir from a water well, wherein the slug size is 0.1 PV; and carrying out subsequent water drive until the water content reaches 98%.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of oil recovery, and specifically relates to a method for integrated "plugging / regulation / displacement" to improve oil reservoir recovery. [0003] Background technique: [0004] At present, the production of major domestic oilfields has entered the development stage of medium and high water cut. The long-term injection of water and the high-strength erosion of the produced fluid have caused the destruction of the rock structure of the reservoir, and the formation of ultra-high permeability bands or advantageous channels between the injection and production wells has further increased the storage capacity. The heterogeneity of the layer causes the injected water or even the polymer solution to rush along the dominant channel, which seriously affects the development effect of water flooding and polymer flooding. At present, the treatment of superior channels has become a technical problem that must be solved...

Claims

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Application Information

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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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