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Method for performing thick oil huff-puff cold recovery by using bio-nano materials

A technology for accumulating heavy oil, which is applied in the direction of production fluid, earthwork drilling, wellbore/well components, etc. It can solve the problems of poor overall effect, poor thermal energy utilization rate, unsatisfactory recovery rate, etc., and reduce viscosity , Improve oil phase flow, excellent biological safety effect

Pending Publication Date: 2022-01-04
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Heavy oil is rich in high-viscosity substances such as colloids, asphaltene and paraffin, which has high seepage resistance, poor fluidity, high difficulty in mining, and unsatisfactory recovery
[0003] Thermal recovery of heavy oil plays a key role in the development of heavy oil reservoirs. However, after multiple rounds of thermal recovery in the same reservoir, the thermal energy utilization rate is poor, the heat loss is serious, the water cut increases, and the production decreases. The overall tendency to get worse

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A crude oil-bearing porous medium with a porosity of 46% and a permeability of 10307 mD was used for water injection displacement until the water production rate rose to 100%, the residual oil saturation was 78%, the water saturation was 22%, and the recovery factor was 61%. Dilute BioNanoEM Type A in water and stir evenly to make Type A emulsion with a concentration of 0.1% by mass. Dilute BioNanoEM J-type in water and stir evenly to make a J-type emulsion with a concentration of 20% by mass. After the type A emulsion is injected into the crude oil-containing porous medium at 0.2 pv (the above-mentioned porous medium containing crude oil with a porosity of 46% and a permeability of 10307 mD) for displacement, the J-type emulsion is injected at 0.2 pv into the porous medium containing crude oil, and the slug After the displacement is completed, 1 pv of pure water is injected, and the above flow rate is 0.5 ml / min; the effluent is collected during the displacement proces...

Embodiment 2

[0032] A crude oil-bearing porous medium with a porosity of 16% and a water permeability of 3 mD was used for displacement by water injection until the water production rate rose to 100%, the residual oil saturation was 25%, the water saturation was 75%, and the recovery factor was 44%; Inject BioNanoEM type A (mass percentage concentration: 5%) at 0.2 pv, bionanoEM type J (mass percentage concentration: 20%) at 0.2 pv, and bioNanoEM type F (mass percentage concentration: 25%) at 0.2 pv pv injects crude oil-containing porous media (oil-containing porous media with a porosity of 16% and a water permeability of 3 mD) at a flow rate of 0.5 ml / min; Closed for 48 hours. Continue to carry out water flooding, inject 1 pv of pure water at a flow rate of 0.5 ml / min, collect the effluent during the flooding process, wait for the oil and water to separate, and recover the oil phase; the measured oil recovery rate is 52%, an increase of 8% .

Embodiment 3

[0034]A crude oil-bearing porous medium with a porosity of 51% and a water permeability of 11,000 mD was used for water injection displacement until the water production rate rose to 100%, the residual oil saturation was 28%, the water saturation was 72%, and the recovery factor was 60%; Inject BioNanoEM type A (mass percentage concentration: 5%) at 0.2 pv, bioNanoEM type J (mass percentage concentration: 20%) at 0.2 pv, and bioNanoEM type F (mass percentage concentration: 25%) at 0.2 pv pv injects crude oil-containing porous media (oil-containing porous media with a porosity of 51% and a water permeability of 11,000 mD) at a flow rate of 0.5 ml / min; after the slug displacement is completed, pump 5pv of nitrogen to seal the crude oil-containing porous media 48 hours. Continue to carry out water flooding, inject 1 pv of pure water at a flow rate of 0.5 ml / min, collect the effluent during the flooding process, wait for the oil and water to separate, and recover the oil phase; th...

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Abstract

The invention discloses a method for performing thick oil huff-puff cold recovery by using bio-nano materials. The method comprises the following steps of: respectively preparing bio-nano slug liquids by using different bio-nano materials to form combined slugs, wherein the combined slugs are at least two of BioNanoEM bio-nano materials of A series, F series, L series and J series, and respectively stirring or stirring after diluting with water to form different bio-nano slug liquids; and during oil displacement treatment, sequentially injecting the different bio-nano slug liquids into an oil-containing porous medium according to the sequence, promoting seepage of an oil phase in pores, then performing water-phase oil displacement, pushing the bio-nano slug liquids to go deep into the oil-containing porous medium, expanding the sweep range of the bio-nano slug liquids, enabling the oil phase to flow out of the porous medium along with bio-nano emulsion for extraction and recovery, and realizing oil phase yield increase and recovery efficiency improvement. The method disclosed by the invention has the advantages of high efficiency, energy conservation, simple construction process, convenience in industrial application and the like, can improve the yield of a thick oil reservoir and has broad application prospects in the field of oil exploitation.

Description

technical field [0001] The invention belongs to the field of biology and petroleum exploitation, and in particular relates to a method for huffing and puffing cold recovery of heavy oil by using biocomposites. Background technique [0002] my country is rich in heavy oil resources, accounting for about 30% of crude oil reserves. Heavy oil is rich in high-viscosity substances such as colloid, asphaltenes, and paraffin, which has high seepage resistance, poor fluidity, high difficulty in mining, and unsatisfactory recovery. [0003] Thermal recovery of heavy oil plays a key role in the development of heavy oil reservoirs. However, after multiple rounds of thermal recovery in the same reservoir, the thermal energy utilization rate is poor, the heat loss is serious, the water cut increases, and the production decreases. The overall effect tends to get worse. [0004] The cold mining process has natural advantages such as simple construction, convenient industrial application, ...

Claims

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Application Information

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IPC IPC(8): E21B43/16
CPCE21B43/16
Inventor 贠军贤谭剑峰楼小玲张颂红
Owner ZHEJIANG UNIV OF TECH
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