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Low-permeability sandstone oil reservoir polymer-surfactant double-slug type profile control agent and using method thereof

A sandstone reservoir and profile control agent technology, applied in chemical instruments and methods, earthwork drilling, production fluids, etc., can solve low-permeability sandstone reservoirs with less research on profile control, waxy, colloid, and asphaltene deposits , Ineffective clay and other problems, to achieve the effect of increasing water flooding sweep coefficient, good shear resistance, and improving heterogeneity

Inactive Publication Date: 2017-10-24
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] 2. Due to the influence of temperature, pressure and other factors, it is easy to cause water channeling, fingering, invalid water circulation and clay expansion during water flooding.
[0006] 3. During the operation, the reservoir is extremely vulnerable to damage from external incompatible fluids. At the same time, due to the influence of temperature, pressure and other factors, it is easy to cause wax, colloid, and asphaltene to deposit near the wellbore, forming organic plugging
[0007] 4. However, the traditional research on low-permeability sandstone reservoirs mainly focuses on acidizing, fracturing and other processes, and there are few studies on profile control of low-permeability sandstone reservoirs

Method used

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  • Low-permeability sandstone oil reservoir polymer-surfactant double-slug type profile control agent and using method thereof
  • Low-permeability sandstone oil reservoir polymer-surfactant double-slug type profile control agent and using method thereof
  • Low-permeability sandstone oil reservoir polymer-surfactant double-slug type profile control agent and using method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. The method of using the profile control agent: (1) Firstly, the prepared water is exposed to oxygen 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 rate at a temperature of 15℃ Stir for 4 hours to obtain the profile control agent; (3) After the preparation is completed, the profile control agent is directly injected into the core.

[0039] 2. To prepare water, adjust the salinity to 500mg / L by adding NaCl to the distilled water to simulate the source water used in production.

[0040] 3. The specific dosage of medicament is:

[0041] Slug A: The compound polymer is composed of three partially hydrolyzed polyacrylamides with different molecular masses, each with a molecular mass of 500*10 4 , 800*10 4 , 1000*10 4 , The mass ratio is 50:35:15; the mass ratio of compound polymer, chromium acetate, aluminum trichloride, N,N-methylenebisacrylamide, and sodium hexametaphosphate is 0.1%: 0.075%: 0.0...

Embodiment 2

[0069] 1. The method of using the profile control agent: (1) Firstly, the prepared water is exposed to oxygen 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℃ Stir for 5 hours to obtain the profile control agent; (3) After the preparation is completed, the profile control agent is directly injected into the core.

[0070] 2. Prepare the water, adjust the salinity to 8000mg / L by adding NaCl to the distilled water to simulate the oilfield sewage used in actual production.

[0071] 3. The specific dosage of medicament is:

[0072] Slug A: The compound polymer is composed of three types of partially hydrolyzed polyacrylamide with different molecular masses, each with a molecular mass of 500*10 4 , 800*10 4 , 1000*10 4 , The mass ratio is 50:35:15; the mass ratio of compound polymer, chromium acetate, aluminum trichloride, N,N-methylenebisacrylamide, sodium hexametaphosphate is ...

Embodiment 3

[0100] 1. The method of using the profile control agent: (1) Firstly, the prepared water is exposed to oxygen 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 rate at a temperature of 55°C Stir for 6 hours to obtain the profile control agent; (3) After the preparation is completed, the profile control agent is directly injected into the core.

[0101] 2. Prepared water: adjust the salinity by adding soluble salts to the distilled water, the final salinity is 35000mg / L, which is used to simulate the oilfield sewage used in actual production.

[0102] 3. The specific dosage of medicament is:

[0103] Slug A: The compound polymer is composed of three partially hydrolyzed polyacrylamides with different molecular masses, each with a molecular mass of 500*10 4 , 800*10 4 , 1000*10 4 , The mass ratio is 50:35:15; the mass ratio of compound polymer, chromium acetate, aluminum trichloride, N,N-methylenebisacryla...

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Abstract

The invention provides a low-permeability sandstone oil reservoir polymer-surfactant double-slug type profile control agent and a using method thereof and relates to the field of oil-field applied chemistry. The profile control agent is injected into a low-permeability sandstone oil reservoir in a double-slug mode, and a front-arranged slug is polymolecular compound polymer and can be combined with insoluble suspended matter particles in the oil reservoir to form a core surrounding type molecular clew structure so as to conduct selective blockage on reservoir layer micro cracks. A rear-arranged slug is a compound surfactant, and after the front-arranged slug is effectively blocked, the front-arranged slug is injected in the oil reservoir, unaffected areas in the oil reservoir are subjected to surfactant driving so as to reduce the content of residual oil in the oil reservoir, increase the oil-layer water absorption index and improve the phenomenon of sedimentation of waxiness, gelatine and asphaltene in near well zones. Through the double-slug combined mode, the nonhomogeneity of the oil reservoir is improved, the subsequent water drive waves and coefficients are increased, and forming of a dead oil area of the low-permeability sandstone oil reservoir is inhibited, and the disadvantages that in a traditional oil extraction method, the extraction rate of a low-permeability sandstone oil reservoir is low, and the economic benefits are poor are overcome.

Description

Technical field [0001] The invention relates to a poly-surface double-slug profile control agent for low-permeability sandstone reservoirs and a use method thereof. The profile control agent can improve reservoir adaptability and further improve the oil-increasing effect of low-permeability sandstone reservoirs, belonging to an oil field Applied chemical agent field. Background technique [0002] Regarding the definition of low-permeability sandstone reservoirs, there are many schemes at home and abroad, which change with changes in economics, culture and technology. Chinese scholars divide low-permeability oil fields into three categories according to the average permeability of the oil layer: ①General low-permeability oil fields—the average oil layer permeability is (50~10.1)*10 -3 μm 2 ②Ultra-low permeability oil field—average permeability of oil layer (10.0~1.1)*10 -3 μm 2 ③Ultra-low permeability oil field—average permeability of oil layer (1.0~0.1)*10 -3 μm 2 . [0003] With ...

Claims

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Application Information

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IPC IPC(8): E21B33/13E21B43/16C09K8/512
CPCE21B33/13C09K8/512E21B43/16
Inventor 张晓丽袁鹏飞曹广胜
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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