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Double-slug compound profile control agent for tight oil reservoir and usage method thereof

A technology for tight oil reservoirs and profile control agents, applied in chemical instruments and methods, earthwork drilling and production, sealing/isolation, etc., can solve the problems of exacerbating the heterogeneity of tight oil reservoirs, affecting the development effect of tight oil reservoirs, and water absorption in fractures In order to achieve the effects of suppressing the generation of dead oil zone, suppressing the viscosity reduction effect and enhancing adaptability

Inactive Publication Date: 2017-11-24
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] (2) Fracture systems, especially structural fractures intensify the heterogeneity of tight oil reservoirs
Moreover, due to the development of high-angle structural fractures and low-angle detachment fractures and diagenetic fractures in the reservoir, the water absorption capacity of the fractures becomes stronger during water injection, resulting in a decrease in the water absorption index of the reservoir.
[0009] (5) There are many dead oil zones. During the conventional water flooding process, most of the displacement fluid flows through the fracture system, resulting in uneven distribution of the water absorption profile. Tight oil reservoir development effect

Method used

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  • Double-slug compound profile control agent for tight oil reservoir and usage method thereof
  • Double-slug compound profile control agent for tight oil reservoir and usage method thereof
  • Double-slug compound profile control agent for tight oil reservoir and usage method thereof

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 below 3 mg / L; (2) Add the agent to the prepared water at a constant speed at a temperature of 30°C. Stir for 4 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0041] 2. Prepare water, adjust the salinity to 500mg / L by adding NaCl to the distilled water, to simulate the source water used in oil field production.

[0042] 3. The specific application dosage is:

[0043] Slug A: Partially hydrolyzed polyacrylamide, chromium acetate, aluminum trichloride, sodium hexametaphosphate, and sodium sulfite in a mass ratio of 0.015%: 0.014%: 0.015%: 0.05%: 0.3%, and the remaining components are prepared water.

[0044] Slug B: the mass ratio of oleic acid diethanolamide to sodium dodecylsulfonate is 1.5%:...

Embodiment 2

[0071] 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 the agent to the prepared water at a temperature of 45°C, at a constant speed Stir for 5 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0072] 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.

[0073] 3. The specific application dosage is:

[0074] Slug A: Partially hydrolyzed polyacrylamide, chromium acetate, aluminum trichloride, sodium hexametaphosphate, and sodium sulfite in a mass ratio of 0.01%: 0.01%: 0.01%: 0.03%: 0.2%, and the remaining components are prepared water.

[0075] Slug B: The mass ratio of coconut oil fatty acid diethanolamide and sodium dodecylsul...

Embodiment 3

[0102] 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 below 3mg / L; (2) Add the agent to the prepared water at a temperature of 55°C, Stir for 6 hours to obtain the profile control agent; (3) After the preparation is completed, inject the profile control agent directly into the rock core.

[0103] 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.

[0104] 3. The specific application dosage is:

[0105] Slug A: The mass ratio of partially hydrolyzed polyacrylamide, chromium acetate, aluminum trichloride, sodium hexametaphosphate, and sodium sulfite is 0.02%: 0.02%: 0.02%: 0.07%: 0.4%, and the remaining components are prepared water.

[0106] Slug B: The mass ratio of coconut oil...

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Abstract

A double-slug composite profile control agent for tight oil reservoirs and its application method relate to the field of oilfield applied chemistry. The profile control agent of the present invention is injected into tight oil reservoirs in the form of double slugs, and the front slug uses low molecular weight partially hydrolyzed polyacrylamide and additives to form a profile control agent with low viscosity, strong fluidity and strong shear resistance. The slug is injected into the oil reservoir at a relatively low pressure to seal the fracture system; the post-slug is a compound surfactant, which is injected into the oil reservoir after the front slug is effectively blocked, and the unsealed pores are sealed. Surfactant flooding, to reduce the remaining oil content in the reservoir and increase the water absorption index of the oil layer; the invention improves the heterogeneity of tight oil reservoirs, low recovery degree, low water absorption index and high water injection pressure through the combination of double slugs, increasing Subsequent water flooding sweep coefficient to improve the economic benefits of tight oil reservoirs.

Description

technical field [0001] The invention relates to a double-slug composite profile control agent for tight oil reservoirs and its application method. The profile control agent can improve the adaptability of reservoirs, and further improve the oil recovery rate of tight oil reservoirs, and belongs to the field of chemical agents applied in oilfields . Background technique [0002] Tight oil reservoirs refer to large-scale continuous distribution of petroleum resources that coexist with or are closely adjacent to oil-generating rock series. The lithology of the reservoir mainly includes tight sandstone, tight limestone and carbonate rock, and the permeability of the overlying matrix is ​​less than 0.1mD. A single well has no natural industrial production capacity. Tight oil refers to oil accumulations that are sandwiched in or close to high-quality oil source formations and have not undergone large-scale long-distance migration. It is an unconventional oil resource. Low porosit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K8/508C09K8/584C09K8/588E21B33/13E21B43/22
CPCC09K8/5083C09K8/5045C09K8/584C09K8/588E21B33/13E21B43/16
Inventor 张晓丽袁鹏飞付小坡马骁王磊宋鑫张志群
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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