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Polymer-surfactant dual-slug type profile control agent for fractured oil reservoir and use method of polymer-surfactant dual-slug type profile control agent

A profile control agent and oil reservoir technology, applied in chemical instruments and methods, earthwork drilling and production, production fluids, etc., can solve the problems that are difficult to meet the requirements of polymer flooding development of fractured reservoirs, affect the development effect of fractured reservoirs, molecular line Narrow cluster size distribution, etc., to achieve the effects of inhibiting the formation of dead oil zones, enhancing adaptability, and increasing drag coefficient and residual drag coefficient

Inactive Publication Date: 2017-10-24
DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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.
[0005] 3. There are many dead oil areas. In the conventional water flooding process, most of the displacement fluid flows through the fracture system, resulting in uneven water absorption profiles. Dead oil areas are gradually formed in areas that have not been affected by the displacement fluid, seriously affecting fractures. Type reservoir development effect
[0006] 4. The currently used polymer is usually partially hydrolyzed polyacrylamide, which has poor salt resistance and narrow molecular coil size distribution, which is easy to be lost in the process of polymer flooding, and it is difficult to adapt to the development needs of polymer flooding in fractured reservoirs

Method used

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  • Polymer-surfactant dual-slug type profile control agent for fractured oil reservoir and use method of polymer-surfactant dual-slug type profile control agent
  • Polymer-surfactant dual-slug type profile control agent for fractured oil reservoir and use method of polymer-surfactant dual-slug type profile control agent
  • Polymer-surfactant dual-slug type profile control agent for fractured oil reservoir and use method of polymer-surfactant dual-slug type profile control agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] 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 constant speed at a temperature of 15°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.

[0038] 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.

[0039] 3. The specific application dosage is:

[0040] The complex polymer is composed of three kinds of partially hydrolyzed polyacrylamide with different molecular weights, the molecular weights are 1200*10 4 、1900*10 4 、2500*10 4 , its mass ratio is 20:65:15; the mass ratio of complex polymer, chromium acetate, sodium sulfite, aluminum citrate, O-benzyl-L-threonine benzyl oxalate...

Embodiment 2

[0068] 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 constant speed at a temperature of 35°C. 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.

[0069] 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.

[0070] 3. The specific application dosage is:

[0071] 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 、1900*10 4 、2500*10 4 , its mass ratio is 20:65:15; the mass ratio of complex polymer, chromium acetate, sodium sulfite, aluminum citrate, nafuramide ester oxalat...

Embodiment 3

[0099] 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.

[0100] 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.

[0101] 3. The specific application dosage is:

[0102] 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 、1900*10 4 、2500*10 4 , its mass ratio is 20:65:15; the mass ratio of compound polymer, chromium acetate, sodium...

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Abstract

The invention discloses a polymer-surfactant dual-slug type profile control agent for a fractured oil reservoir and a use method of the polymer-surfactant dual-slug type profile control agent, and relates to the field of oil field practical chemistry. The polymer-surfactant dual-slug type profile control agent is injected into the fractured oil reservoir through a dual-slug mode, and according to a front slug, partially hydrolyzed polyacrylamide with three different molecular mass values is mixed to form compound polymers, an annexing agent is added into the compound polymers to form the profile control agent, and high-permeability areas of the fractured oil reservoir can be effectively blocked; and a rear slug is a compound surfactant, and is injected into the oil reservoir after the front slug conducts effective blocking, and the rear slug conducts surfactant flooding on medium-permeability areas and low-permeability areas of the oil reservoir to reduce the residual oil content in the oil reservoir and enhance an oil layer injectivity index. According to the polymer-surfactant dual-slug type profile control agent for the fractured oil reservoir and the use method of the polymer-surfactant dual-slug type profile control agent, through the mode of combining the double slugs, the heterogeneity of the oil reservoir is improved, a follow-up waterflood sweep efficiency is increased, an inert area of the fractured oil reservoir is prevented from forming, and thus the defects that a traditional oil production method is low in recovery efficiency and poor in economic benefit when being used on the fractured oil reservoir are improved.

Description

technical field [0001] The invention relates to a profile control agent of poly-surface double-slug type for fractured oil reservoirs and a method for using the same. The profile control agent can improve the adaptability of reservoirs and further increase the oil recovery rate of fractured oil reservoirs, belonging to oilfield applied chemistry drug field. Background technique [0002] In recent years, polymer flooding technology has been applied and tested on a large scale in Daqing, Shengli, Xinjiang and Bohai oilfields in China, and has achieved obvious effects of increasing oil production and reducing water loss, and the technical and economic effects are very significant. However, in the practice of polymer flooding, it is also found that for fractured reservoirs, the recovery degree is low, indicating that the efficiency of polymer application in fractured reservoirs is low; The impact of the system on reservoir development is multifold: [0003] 1. Fracture systems...

Claims

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Application Information

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IPC IPC(8): E21B43/16E21B33/13C09K8/42C09K8/584C09K8/588
CPCE21B43/16C09K8/426C09K8/584C09K8/588E21B33/13
Inventor 张晓丽袁鹏飞王培龙李天民高超白玉杰
Owner DALIAN DONGYOU RUIJIA PETROLEUM TECH CO LTD
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