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Low-permeability sandstone oil deposit chromium-aluminum ion compound 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 , organic clogging and other problems, to achieve the effect of enhancing the adaptability of salinity, improving hydrophilicity and low viscosity

Inactive Publication Date: 2017-09-29
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 deposit chromium-aluminum ion compound profile control agent and using method thereof
  • Low-permeability sandstone oil deposit chromium-aluminum ion compound profile control agent and using method thereof
  • Low-permeability sandstone oil deposit chromium-aluminum ion compound 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) 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.

[0039] 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.

[0040] 3. The specific application dosage is:

[0041] Slug A: The composite polymer is composed of three partially hydrolyzed polyacrylamides with different molecular weights, the molecular weights are 500*10 4 、800*10 4 、1000*10 4 , the mass ...

Embodiment 2

[0069] 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 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 core.

[0070] 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.

[0071] 3. The specific application dosage is:

[0072] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different molecular weights, the molecular weights are 500*10 4 、800*10 4 、1000*10 4,...

Embodiment 3

[0100] 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.

[0101] 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.

[0102] 3. The specific application dosage is:

[0103] Slug A: The composite polymer is composed of three partially hydrolyzed polyacrylamides with different molecular w...

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Abstract

The invention discloses a low-permeability sandstone oil deposit chromium-aluminum ion compound 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 deposit in a two-segmentation plug mode, a front-arranged segmentation plug is a polymolecular compounded-type polymer, and can be combined with insoluble suspending particles in the oil deposit to form a nuclear-surrounding type molecular clew type polymer, and selective plugging is conducted on oil deposit micro cracks and large pores; a rear-arranged segmentation plug is a low-viscosity compounded polymer, an appropriate amount of clay stabilizer and surfactant are added, profile control and displacement are conducted on an un-plugged area, the phenomenon that the clay of the low-permeability sandstone oil deposit expands can be inhibited, and the situation that wax, colloid and pitch are deposited in near-zone zones is avoided. According to the low-permeability sandstone oil deposit chromium-aluminum ion compound profile control agent and the using method thereof, the heterogeneity of the oil deposit can be improved, subsequent water drive waves and coefficients are increased, and forming of a low-permeability sandstone oil deposit dead oil zone is inhibited, so that the shortcomings in the traditional oil recovery method that the low permeability fracture oil deposit is low in recovery rate, poor in economic benefit and the like are improved.

Description

technical field [0001] The invention relates to a low-permeability sandstone reservoir chromium-aluminum ion compound profile control agent and its application method. The profile control agent can improve reservoir adaptability and further improve the oil-increasing effect of low-permeability sandstone reservoirs, belonging to oilfield applied chemistry drug field. Background technique [0002] Regarding the definition of low-permeability sandstone reservoirs, there are many schemes at home and abroad, which change with the change of economy, culture and technology. Chinese scholars divide low-permeability oilfields into three categories according to the average permeability of reservoirs: ① General low-permeability oilfields—the average permeability of reservoirs is (50-10.1)*10 -3 μm 2 ;②Ultra-low permeability oilfield—average permeability of reservoir (10.0~1.1)*10 -3 μm 2 ; ③Ultra-low permeability oilfield—average permeability of reservoir (1.0~0.1)*10 -3 μm 2 . ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B33/13E21B43/22C09K8/512
CPCE21B33/13C09K8/512E21B43/16
Inventor 袁鹏飞张晓丽史雪冬鲍春雷刘继颖曹广胜吴浩然付强
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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