Double-slug profile control agent for tight oil reservoir and usage methodthereof

A technology for tight oil reservoirs and profile control agents, which can be applied in chemical instruments and methods, earthwork drilling, sealing/sealing, etc. Exponential decline and other problems, to achieve the effect of inhibiting the formation of dead oil areas, high water injection pressure, and increasing the sweeping coefficient of water flooding

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 profile control agent for tight oil reservoir and usage methodthereof
  • Double-slug profile control agent for tight oil reservoir and usage methodthereof
  • Double-slug profile control agent for tight oil reservoir and usage methodthereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 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.

[0040] 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.

[0041] 3. The specific application dosage is:

[0042] Slug A: compound polymer, resorcinol, urotropine, 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.

[0043] Slug B: cetyltrimethylammonium bromide and sodium dodecylsulfonate have a mass ratio of 0.8%: 2.2%, and the remaining comp...

Embodiment 2

[0070] 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.

[0071] 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.

[0072] 3. The specific application dosage is:

[0073] Slug A: compound polymer, resorcinol, urotropine, 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.

[0074] Slug B: cetyltrimethylammonium bromide and sodium dodecylsulfonate in a mass ratio of 0.5%:2%, and the remaining components ...

Embodiment 3

[0101] 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.

[0102] 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.

[0103] 3. The specific application dosage is:

[0104] Slug A: Compound polymer, resorcinol, urotropine, sodium hexametaphosphate, and sodium sulfite in a mass ratio of 0.02%: 0.02%: 0.02%: 0.07%: 0.4%, and the remaining components are prepared water.

[0105] Slug B: cetyltrimethylammonium bromide and sodium dodecylsulfonate have a ...

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Abstract

A double-slug type 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 is mixed with a low molecular weight compound polymer, resorcinol and hexamethamine to form a profile control agent, which has low viscosity and strong fluidity , shear resistance characteristics, can be injected into the reservoir at low pressure to seal the fracture system; the post-slug is a compound surfactant, which is injected into the reservoir after the front-slug is effectively blocked, and the unsealed Surfactant flooding is carried out in the pores 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 water injection pressure through the combination of double slugs. If it is large, the follow-up water drive sweep coefficient will be increased to improve the economic benefits of tight oil reservoirs.

Description

technical field [0001] The invention relates to a double-slug type profile control agent for tight oil reservoirs and a use method thereof. The profile control agent can improve reservoir adaptability and further increase the oil recovery rate of tight oil reservoirs, and belongs to the field of applied chemical agents in oil fields. 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 porosity and low permea...

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 张晓丽袁鹏飞曹广胜刘继颖鲍春雷史雪冬付强李春成
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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