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Chromium-aluminum ion compound profile control agent for highly permeable duct type oil deposit and use method thereof

A profile control agent and oil reservoir technology, applied in chemical instruments and methods, earthwork drilling and production, and drilling compositions, etc., can solve problems that are difficult to adapt to the complexity of reservoirs, reduce the sweep efficiency of injected water, and low water flooding sweep efficiency 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: 2017-10-17
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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  • Chromium-aluminum ion compound profile control agent for highly permeable duct type oil deposit and use method thereof
  • Chromium-aluminum ion compound profile control agent for highly permeable duct type oil deposit and use method thereof
  • Chromium-aluminum ion compound profile control agent for highly permeable duct type oil deposit and use method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] 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.

[0037] 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.

[0038] 3. The specific application dosage is:

[0039] 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

[0065] 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.

[0066] 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.

[0067] 3. The specific application dosage is:

[0068] 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

[0094] 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.

[0095] 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.

[0096] 3. The specific application dosage is:

[0097] Slug A: The composite polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different mol...

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Abstract

The invention discloses a chromium-aluminum ion compound profile control agent for a highly permeable duct type oil deposit and a use method thereof and relates to the field of applied chemistry of oil fields. The profile control agent provided by the invention is injected into the highly permeable duct type oil deposit in form a double section slug. A plurality of high molecular polyacrylamides and additives are mixed in the preposed section slug to form a compound polymer to block a highly permeable region and large ducts in the oil deposit; a plurality of low molecular polyacrylamides and additives are mixed in the post-posed section slug to boast the characteristics of low viscosity, high mobility and shear resistance. After the pre-posed section slug is blocked, the profile control agent injected into the oil deposit for profile control and displacement, so that small scaled water channeling and fingering phenomena generated by water drive after blocking can be inhibited; the profile control agent contains a proper amount of surfactant, so that the hydrophilicity of rocks of the oil deposit can be improved and a phenomenon that waxiness, colloids and asphaltene which are hard to control by a conventional profile control method are deposited in an immediate vicinity of wellbore is inhibited. The profile control agent disclosed by the invention is simple in preparation method and can be suitable for prepared water, the degree of mineralization of which is 500-35000mg / L, and the raw materials are cheap and easily available.

Description

technical field [0001] The invention relates to a chromium-aluminum ion compound profile control agent for high-permeability pore-type oil reservoirs and a method for using the same. The profile-control agent can improve the adaptability of reservoirs, and further improve the oil-increasing effect of high-permeability pore-type oil reservoirs, belonging to oil fields field of applied chemicals. 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 the pump ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512E21B33/13E21B37/06E21B43/22
CPCC09K8/512E21B33/13E21B37/06E21B43/16
Inventor 张晓丽袁鹏飞李天民王培龙高超白玉杰付小坡
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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