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A Method of Improving Oil Displacement Effect in Strong Vertical Heterogeneity Reservoir

A technology with heterogeneity and oil displacement efficiency, which is applied in earthwork drilling, wellbore/well components, production fluids, etc., and can solve problems such as different modes of action and mechanisms of action

Active Publication Date: 2019-03-19
XI'AN PETROLEUM UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And Liang Yuwen and others mentioned in the article "Air Foam Control and Flooding Pilot Test in Strong Heterogeneity Reservoirs—Taking Hu 12 Fault Block in Huzhuangji Oilfield as an Example" and the mode of action and mechanism of action of the present invention mentioned in the article There are also some differences in improving the oil displacement effect
It can be seen that for the strong vertical heterogeneity reservoirs, the method of improving the overall oil displacement effect through multiple displacement methods has not been reported yet.

Method used

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  • A Method of Improving Oil Displacement Effect in Strong Vertical Heterogeneity Reservoir

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Embodiment 1

[0044] A method of improving the oil displacement effect of the strong vertical heterogeneity reservoir of the present invention comprises the following steps:

[0045] Step 1. Select a high-permeability core and a low-permeability core with a diameter of 2.5 cm and a length of 5 cm respectively. The gas measurement shows that the permeability of the high-permeability core is 514×10 -3 μm 2 , the low permeability core permeability is 7×10 -3 μm 2 , the permeability ratio of the two cores is 73.43 times;

[0046] Step two, prepare Mn 2+ Concentration of 15000mg / L experimental simulated formation water MnCl 2 Solution, formation water salinity is 300000mg / L;

[0047] Step 3, preparing experimental simulated oil according to kerosene and formation crude oil, the viscosity reaches 1.82mPa.s;

[0048] Step 4. Place the core in a high-pressure saturation device. The pressure is 8MPa and the time is 15 hours to saturate the simulated formation water. The porosity of the high-pe...

Embodiment 2

[0065] A method of improving the oil displacement effect of the strong vertical heterogeneity reservoir of the present invention comprises the following steps:

[0066] Step 1. Select a high-permeability core and a low-permeability core with a diameter of 2.5 cm and a length of 5 cm. The gas measurement shows that the permeability of the high-permeability core is 323×10 -3 μm 2 , the low permeability core permeability is 10.5×10 -3 μm 2 , the permeability ratio of the two cores is 30.76 times;

[0067] Step two, prepare Mn 2+ Concentration of 14000mg / L experimental simulated formation water MnCl 2 Solution, formation water salinity is 200000mg / L;

[0068] Step 3, prepare experimental simulated oil according to kerosene and formation crude oil, the viscosity reaches 1.16mPa.s;

[0069] Step 4. Place the core in a high-pressure saturation device. The pressure is 10 MPa and the time is 12 hours to saturate the simulated formation water. The porosity of the high-permeability...

Embodiment 3

[0086] A method of improving the oil displacement effect of the strong vertical heterogeneity reservoir of the present invention comprises the following steps:

[0087] Step 1. Select a high-permeability core and a low-permeability core with a diameter of 2.5 cm and a length of 5 cm respectively. The gas measurement shows that the permeability of the high-permeability core is 76×10 -3 μm 2 , the low permeability core permeability is 5×10 -3 μm 2 , the permeability ratio of the two cores is 15.2 times;

[0088] Step two, prepare Mn 2+ Concentration of 16000mg / L experimental simulated formation water MnCl 2 Solution, formation water salinity is 400000mg / L;

[0089] Step 3, preparing experimental simulated oil according to kerosene and formation crude oil, the viscosity reaches 1.01mPa.s;

[0090] Step 4. Place the core in a high-pressure saturation device. The pressure is 12 MPa and the time is 10 hours to saturate the simulated formation water. The porosity of the high-pe...

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Abstract

The invention discloses a method for improving the oil displacement effect of a strong vertical heterogeneous oil reservoir. The method comprises the steps that a high-permeable core and a low-permeable core which are of different permeability ratios are separately selected; experimental simulation formation water is prepared; experimental simulation oil is prepared; the cores are saturated with the Mn<2+> simulation formation water, the porosity is measured, and the pore volume is calculated; the high-permeable core and the low-permeable core are connected in parallel, oil displacement of the cores is simulated through an experiment, and magnetic resonance imaging T2 spectra are measured; the simulation formation water and CO2 are sequentially used, a surfactant is injected, the CO2 is reused, the simulation formation water is injected at a certain speed after the CO2 is injected, foam liquid is injected after the CO2 is injected, the magnetic resonance imaging T2 spectra are measured, and oil displacement efficiency is calculated; and oil displacement efficiency in different displacement modes is added to obtain the total oil displacement efficiency of the high-permeable core and the low-permeable core. By adoption of the method, a large hole channel of a high-permeable oil reservoir can be sealed, oil-water interfacial tension of a low-permeable oil reservoir is reduced, the oil displacement effect of the low-displacement oil reservoir is improved, and therefore the overall oil displacement effect of the strong vertical heterogeneous oil reservoir is effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil and gas development experiments, in particular to a method for improving the oil displacement effect of a strongly vertically heterogeneous reservoir. Background technique [0002] Reservoirs with strong vertical heterogeneity refer to reservoirs with high and low permeability in the vertical direction at the same time, and the permeability difference between them is large. For such reservoirs, there will be a large amount of remaining oil after water flooding In the small pores of low-permeability reservoirs, how to improve the oil displacement effect of low-permeability reservoirs after water flooding through the combination of displacement methods and optimization of injection volume, and then improve the overall development effect of the reservoir. For oil with strong vertical heterogeneity The high-efficiency development of Tibet has important guiding value. In the existing research, the patent ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/16
CPCE21B43/166
Inventor 高辉谢青刘峰窦亮彬黄海赵金省
Owner XI'AN PETROLEUM UNIVERSITY