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A composite flooding experimental method of alternately injecting gel and polymer solutions after polymer flooding and subsequent water flooding

A polymer solution, alternate injection technology, applied in earth-moving drilling, production fluid, wellbore/well components, etc., can solve the problem of low oil recovery, avoid sticky fingering phenomenon, short oil displacement time, The effect of slowing the ascent

Inactive Publication Date: 2018-08-10
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above-mentioned analysis, the present invention aims to provide a composite flooding experimental method of alternately injecting gel and polymer solution after polymer flooding plus subsequent water flooding, in order to solve the technical problem of low oil recovery in existing oilfields

Method used

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  • A composite flooding experimental method of alternately injecting gel and polymer solutions after polymer flooding and subsequent water flooding
  • A composite flooding experimental method of alternately injecting gel and polymer solutions after polymer flooding and subsequent water flooding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) After evacuating the cast model for 6 hours, saturate the artificially synthesized brine, and measure the porosity;

[0035] (2) Place the model saturated with artificially synthesized brine in an incubator at a constant temperature (45°C) for 12 hours or more;

[0036] (3) Oil flooding until the model does not produce water, then determine the original oil saturation;

[0037] (4) Use conventional sewage, 25 million ultra-high molecular weight, concentration of 1200mg / L (viscosity 40-50mPa.s, viscosity 20-25mPa.s after shear dilution) to drive oil, injection speed is 3mPa.s min, the injection rate is 0.60PV, and then water flooding to 98% water cut, calculate the recovery factor of polymer flooding + subsequent water flooding;

[0038] (5) inject 0.03PV gel system slug;

[0039] (6) Inject a slug of surfactant solution of 0.03PV, and record liquid production and oil production;

[0040] (7) Carry out multiple rounds of parallel experiments according to the exper...

Embodiment 2

[0043] (1) After evacuating the cast model for 6 hours, saturate the artificially synthesized brine, and measure the porosity;

[0044] (2) Place the model saturated with artificially synthesized brine in an incubator at a constant temperature (45°C) for 12 hours or more;

[0045] (3) Oil flooding until the model does not produce water, then determine the original oil saturation;

[0046] (4) Use conventional sewage, 25 million ultra-high molecular weight, concentration of 1200mg / L (viscosity 40-50mPa.s, viscosity 20-25mPa.s after shear dilution) to drive oil, injection speed is 3mPa.s min, the injection volume is 0.64PV, after which the water is flooded to a water cut of 98%, and the recovery factor of polymer flooding is calculated;

[0047] (5) inject 0.02PV gel system slug;

[0048] (6) Inject a polymer solution slug of 0.02PV, and record liquid production and oil production;

[0049] (7) Carry out multiple rounds of parallel experiments according to the experimental pl...

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Abstract

The present invention relates to a composite oil flooding experiment method in which gel and polymer solutions are alternately injected after polymer flooding and subsequent water flooding. The specific steps are as follows: step 1, first prepare a large slab core; step 2, then perform polymer flooding; step 3 1. Multiple rounds of alternating injection of gel + polymer solution to drive oil; Step 4, subsequent water flooding; Step 5, sorting out data and calculating the ultimate recovery factor. Based on the distribution of remaining oil after polymer flooding and the change of reservoir permeability, the composite flooding experimental method of the present invention seeks an economical and effective method for tapping the potential of remaining oil in the subsequent water flooding stage, which greatly improves the recovery The rate has made a certain contribution to the actual oil recovery work.

Description

technical field [0001] The invention relates to the technical field of chemical flooding, in particular to a compound flooding experimental method in which gel and polymer solutions are alternately injected after polymer flooding and subsequent water flooding. Background technique [0002] For reservoirs with large permeability gradients and severe interlayer heterogeneity, there are problems such as early water breakthrough in oil wells during water flooding, rapid rise of water cut, and low oil recovery. The polymer solution itself has a high viscosity, which can effectively improve the water-oil mobility ratio, help alleviate interlayer conflicts, improve the liquid absorption profile, and expand the swept volume of the displacement liquid, thereby enhancing oil recovery. For such reservoirs, polymer flooding can be carried out directly before water flooding to improve oilfield recovery efficiency. Although polymer flooding can effectively avoid the above-mentioned probl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21B43/22E21B43/20
CPCE21B43/16E21B43/20
Inventor 张继红何庆斌赵昕锐徐思宁杨丰源杨宇迪郭鑫
Owner NORTHEAST GASOLINEEUM UNIV
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