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High permeability pore type oil reservoir polymer/surfactant dual-slug profile control agent and use method thereof

A technology of profile control agent and channel, which is applied in the direction of chemical instruments and methods, earth drilling, and drilling compositions, etc., can solve the problems of low water flooding sweep efficiency, restriction of water flooding recovery, fingering, etc., and achieve Increase the sweep coefficient of water flooding, inhibit the formation of dead oil zones, and improve the effect of low recovery

Inactive Publication Date: 2017-10-20
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The overall level of water flooding recovery in onshore oilfields in my country is low, generally less than 50%. One of the important reasons is that the sweep efficiency of water flooding is low; an important factor affecting the sweep efficiency of water flooding is heterogeneity; Permeable channel reservoirs are characterized by high permeability, wide pore throats and developed micro-fractures. Due to the complexity of pore structure and rock surface properties, high permeability channel reservoirs also have heterogeneity; The propulsion of the pump cannot be uniformly piston-like, causing the injected water to rush along the high-permeability layer, and local water channeling occurs, thereby reducing the sweep efficiency of the injected water and restricting the water flooding recovery.
[0003] The traditional method is to plug the pores and then carry out water flooding. In this method, simple profile control and subsequent water flooding are often difficult to adapt to the complexity of the reservoir, resulting in small-scale water channeling and fingering after plugging. and other phenomena, making it more difficult to further improve the degree of water drive utilization

Method used

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  • High permeability pore type oil reservoir polymer/surfactant dual-slug profile control agent and use method thereof
  • High permeability pore type oil reservoir polymer/surfactant dual-slug profile control agent and use method thereof
  • High permeability pore type oil reservoir polymer/surfactant dual-slug profile control agent and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3mg / L; (2) Add the agent to the prepared water at a constant speed at a temperature of 15°C. Stir for 4 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0034] 2. Prepare water, adjust the salinity to 500mg / L by adding NaCl to the distilled water, so as to simulate the source water used in production.

[0035] 3. The specific application dosage is:

[0036] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different molecular weights, the molecular weights are 1200*10 4 、1800*10 4 、2400*10 4 , its mass ratio is 15:35:50; the mass ratio of complex polymer, chromium acetate, aluminum citrate, sodium sulfite, resorcinol, thiourea, and pota...

Embodiment 2

[0062] 1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3mg / L; (2) Add the agent to the prepared water at a constant speed at a temperature of 35°C. Stir for 5 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0063] 2. Prepare water, adjust the salinity to 8000mg / L by adding NaCl to the distilled water, to simulate the oil field sewage used in actual production.

[0064] 3. The specific application dosage is:

[0065] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different molecular weights, the molecular weights are 1200*10 4 、1800*10 4 、2400*10 4 , its mass ratio is 15:35:50; the mass ratio of complex polymer, chromium acetate, aluminum citrate, sodium sulfite, resorcinol, thiourea, a...

Embodiment 3

[0091]1. The method of using the profile control agent: (1) First, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3mg / L; (2) Add the agent to the prepared water at a temperature of 55°C, Stir for 6 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0092] 2. To prepare water, adjust the degree of salinity by adding soluble salts to the distilled water, and the final degree of salinity is 35000mg / L, which is used to simulate the oilfield sewage used in actual production.

[0093] 3. The specific application dosage is:

[0094] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different molecular weights, the molecular weights are 1200*10 4 、1800*10 4 、2400*10 4 , its mass ratio is 15:35:50; the mass ratio of complex polymer, chromium acetate, aluminum...

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Abstract

A high-permeability pore-type oil reservoir poly-surface double-slug type profile control agent and its application method relate to the field of oilfield applied chemistry. The present invention injects into high-permeability pore-type oil reservoirs through poly-surface double slugs. The pre-slugs are mixed with different molecular weight partially hydrolyzed polyacrylamide and additives, which have the characteristics of high viscosity, strong fluidity and strong shear resistance. It can block the high-permeability pores of the reservoir; the rear slug is a compound surfactant, which is injected into the reservoir after the front slug is effectively blocked, and the unplugged pores are flooded with surfactant to reduce The remaining oil content in the reservoir increases the water absorption index; the invention improves the heterogeneity of the high-permeability pore-type reservoir through the combination of double slugs, the degree of recovery is low, the water absorption index is low, and the water injection pressure is large, and the follow-up water flooding sweep coefficient is increased. , in order to improve the economic benefits of high-permeability pore-type reservoirs.

Description

technical field [0001] The invention relates to a high-permeability pore-type oil reservoir accumulating-surface double-slug type profile control agent and its application method. The profile control agent can improve the adaptability of the reservoir and further increase the oil-increasing effect of the high-permeability pore-type oil reservoir. It belongs to Oil field application chemical agent field. Background technique [0002] The overall level of water flooding recovery in onshore oilfields in my country is low, generally less than 50%. One of the important reasons is that the sweep efficiency of water flooding is low; an important factor affecting the sweep efficiency of water flooding is heterogeneity; Permeable channel reservoirs are characterized by high permeability, wide pore throats and developed micro-fractures. Due to the complexity of pore structure and rock surface properties, high permeability channel reservoirs also have heterogeneity; The propulsion of th...

Claims

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Application Information

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IPC IPC(8): C09K8/512E21B33/13E21B43/22
CPCC09K8/512E21B33/13E21B43/16
Inventor 张晓丽袁鹏飞白玉杰高超王培龙李天民
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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