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Polymer profile control agent for high-seepage pore type oil deposit and use method thereof

A profile control agent and polymer technology, applied in drilling compositions, chemical instruments and methods, earthwork drilling and production, etc., can solve problems that are difficult to adapt to the complexity of reservoirs, reduce the sweep efficiency of injected water, and low sweep efficiency of water flooding To achieve the effects of inhibiting the formation of dead oil zones, prolonging the gel breaking time, and increasing the sweep coefficient of water flooding

Inactive Publication Date: 2017-10-10
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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  • Polymer profile control agent for high-seepage pore type oil deposit and use method thereof
  • Polymer profile control agent for high-seepage pore type oil deposit and use method thereof
  • Polymer profile control agent for high-seepage pore type oil deposit and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 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 less than 3 mg / L; (2) Add part of the hydrolysis polymer to the prepared water at a temperature of 15°C Acrylamide was stirred at a constant speed for 2 hours, then the additive was added to the prepared water and stirred at a constant speed for 3 hours to obtain the profile control agent; (3) After the preparation was completed, the profile control agent was directly injected into the rock core.

[0036] 2. Prepare water, adjust the salinity to 500mg / L by adding NaCl to the distilled water, to simulate the source water used in actual production.

[0037] 3. The specific application dosage is:

[0038] 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 ...

Embodiment 2

[0064] 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 less than 3mg / L; (2) Add part of the hydrolytic polymer to the prepared water at a temperature of 35°C Acrylamide was stirred at a constant speed for 2.5 hours, then the additive was added to the prepared water and stirred at a constant speed for 2.5 hours to obtain the profile control agent; (3) After the preparation was completed, the profile control agent was directly injected into the rock core.

[0065] 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.

[0066] 3. The specific application dosage is:

[0067] 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 、240...

Embodiment 3

[0093] 1. The method of using the profile control agent: (1) Firstly, carry out oxygen exposure treatment on the prepared water to reduce the dissolved oxygen content in the prepared water to below 3 mg / L; (2) add part of the hydrolytic polymer to the prepared water at a temperature of 55°C Acrylamide was stirred at a constant speed for 3 hours, and then the additive was added to the prepared water and stirred at a constant speed for 2 hours to obtain the profile control agent; (3) After the preparation was completed, the profile control agent was directly injected into the rock core.

[0094] 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.

[0095] 3. The specific application dosage is:

[0096] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different mol...

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Abstract

The invention relates to a complex polymer profile control agent for high-permeability pore-type oil reservoirs and a method for using the same, which relate to the field of oilfield applied chemistry. The present invention injects into high-permeability pore-type oil reservoirs in the form of double slugs. The front-end slugs are mixed with multiple high-molecular polyacrylamides and additives to form a compound polymer to block the high-permeability areas and large pores in the oil reservoir; The slug is mixed with multiple low molecular weight polyacrylamide and additives, which has the characteristics of low viscosity, strong fluidity and shear resistance. After the pre-slug is plugged, it is injected into the oil reservoir for control and displacement, which can inhibit water flooding after plugging For the small-scale water channeling and fingering phenomenon, the profile control agent contains an appropriate amount of surfactant, which can improve the hydrophilicity of formation rocks and inhibit the waxy, colloid, and asphaltenes that are difficult to control by traditional profile control methods in the near-wellbore area. The phenomenon of deposition; the preparation method of the profile control agent of the present invention is simple, can adapt to the preparation of water with a salinity of 500mg / L-35000mg / L, and the raw materials are cheap and easy to obtain.

Description

technical field [0001] The invention relates to a composite polymer profile control agent for high-permeability pore-type reservoirs and a method for using the same. The profile-control agent can improve the adaptability of polymer flooding reservoirs, and further improve the oil-increasing effect of polymer flooding in high-permeability pore-type reservoirs. The effect belongs to the field of oilfield applied chemical agents. 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 heterogene...

Claims

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Application Information

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IPC IPC(8): C09K8/512C09K8/508C09K8/584E21B33/13E21B37/06
CPCC09K8/512C09K8/5083C09K8/5086C09K8/584E21B33/13E21B37/06
Inventor 黄岩袁鹏飞张晓丽刘继颖曹广胜付强李春成
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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