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Compound polymer type profile control agent for low-permeability sandstone reservoir and use method of profile control agent

A technology of sandstone reservoir and profile control agent, which is applied in the direction of drilling composition, chemical instruments and methods, earthwork drilling and production, etc., can solve the problem of low permeability sandstone reservoir with less research on profile control, waxy, colloidal, Asphaltene deposition, organic plugging and other problems, to achieve the effect of enhanced oil recovery, good shear resistance and strong fluidity

Inactive Publication Date: 2017-11-10
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[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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  • Compound polymer type profile control agent for low-permeability sandstone reservoir and use method of profile control agent
  • Compound polymer type profile control agent for low-permeability sandstone reservoir and use method of profile control agent
  • Compound polymer type profile control agent for low-permeability sandstone reservoir and use method of profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] 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.

[0041] 2. Prepare water and adjust the salinity to 500mg / L by adding NaCl to simulate the source water used in actual production.

[0042] 3. The specific application dosage is:

[0043] 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 , and its mass ratio is 50:35:1...

Embodiment 2

[0071] 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 Stir acrylamide at a constant speed for 2.5 hours, then add additives to the prepared water, and stir at a constant speed for 2.5 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the core.

[0072] 2. Prepare water and adjust the salinity to 8000mg / L by adding NaCl to simulate the oilfield sewage used in actual production.

[0073] 3. The specific application dosage is:

[0074] 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 , and its mass ratio is 50:35:15; the mass ratio of com...

Embodiment 3

[0102] 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 Stir acrylamide at a constant speed for 3 hours, then add additives to the prepared water, and stir at a constant speed for 2 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the core.

[0103] 2. Preparation of 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.

[0104] 3. The specific application dosage is:

[0105] Slug A: The composite polymer is composed of three partially hydrolyzed polyacrylamides with different molecular weights, the molecular weights ...

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Abstract

The invention relates to a low-permeability sandstone reservoir composite polymer type profile control agent and its application method, which relate to the field of oilfield applied chemistry. The present invention injects low-permeability sandstone reservoirs in the form of double slugs. The pre-slug is a multi-molecular compound polymer, which can be combined with insoluble suspended matter particles in the reservoir to form a polymer with a molecular coil structure around the core. Selective plugging of micro-fractures and large pores in the reservoir; the rear slug is a low-viscosity compound polymer, and an appropriate amount of clay stabilizer and surfactant is added to control and flood unplugged areas, which can suppress low-viscosity The phenomenon of clay swelling in seepage sandstone reservoirs can improve the deposition of wax, colloid and asphaltene near the wellbore; the invention can improve the heterogeneity of reservoirs, increase the follow-up water flooding sweep coefficient, and suppress dead oil areas in low-permeability sandstone reservoirs Formed to improve the disadvantages of traditional oil recovery methods such as low recovery rate and poor economic benefits of low-permeability sandstone reservoirs.

Description

technical field [0001] The invention relates to a low-permeability sandstone reservoir composite polymer 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, and belongs to oilfield applications Chemical 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 . [0003] Wit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/512C09K8/508E21B33/13E21B43/22
CPCC09K8/5083C09K8/512E21B33/13E21B43/16
Inventor 黄岩袁鹏飞张晓丽曹广胜刘继颖鲍春雷史雪冬程少伟
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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