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A kind of preparation method of biogel profile control agent

A technology of biological gel and profile control agent, which is applied in the direction of chemical instruments and methods, drilling compositions, etc., can solve problems such as damage to the formation, pollution of the environment, and blockage of the water layer, and achieve improved permeability, simple preparation process, Ease of use

Active Publication Date: 2018-05-18
SOUTHWEST PETROLEUM UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The technical problem mainly solved by the present invention: Aiming at the clogging of the water layer by the chemical means currently used, there are many kinds of such chemical agents, the development is fast, and the effect is remarkable, and the clogging effect on the oil layer and the water layer, but long-term use, cannot be degraded, To solve the problem of polluting the environment and damaging the formation, a preparation method of a biogel profile control agent is provided. The invention mixes soybean acid-soluble protein and soybean polysaccharide solution to make a gel, then mixes the gel with gelatin, and injects Add cross-linking agent, initiator, gel accelerator and other mixed reactions to prepare the gel profile control agent, and finally carry out drying treatment, packaging and storage. The gel profile control agent prepared by the present invention can be naturally degraded and does not pollute the environment , does not damage the formation, does not contain prohibited drugs, improves the permeability of oil reservoirs during oil exploitation, and enhances oil recovery

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0015] First, measure 35mL soybean acid-soluble protein solution with a mass concentration of 20mg / L in a 250mL three-necked flask, stir it mechanically for 1 hour, put it in a water bath after stirring, set the temperature to 35°C and let it stand for 10 hours, and put it in the three-necked flask Pour the material into a centrifuge, separate at a speed of 8500r / min for 15min, collect the supernatant, and set aside; measure 50mL of a soybean polysaccharide solution with a mass concentration of 35mg / L, and mix it with the above supernatant at a volume ratio of 3:1. Stir evenly to obtain a mixed solution, adjust the pH value of the mixed solution to 3.8 with 5% hydrochloric acid by mass fraction, and mechanically stir for 2 hours. Stir and heat in a water bath at 80°C for 1 hour. After heating, a gel solution is obtained. Adjust the pH of the gel solution to 3.5, and add sodium chloride to the adjusted solution until the concentration of sodium chloride reaches 0.1mol / L. , put ...

example 2

[0018] First, measure 38mL soybean acid-soluble protein solution with a mass concentration of 20mg / L in a 250mL three-necked flask, stir it mechanically for 1.5h, put it in a water bath after stirring, set the temperature to 37°C and let it stand for 11h, after standing still, put the three-necked flask Pour the substance in the centrifuge into a centrifuge, separate at a speed of 8700r / min for 17min, collect the supernatant, and set aside; measure 55mL of a soybean polysaccharide solution with a mass concentration of 35mg / L, and mix it with the above supernatant at a volume ratio of 3:1 , stir evenly to obtain a mixed solution, adjust the pH value of the mixed solution to 3.9 with 5% hydrochloric acid by mass fraction, and mechanically stir for 2.5 hours. Then put it in a water bath at 83°C and stir and heat for 1.5h. After heating, a gel solution is obtained. Adjust the pH value of the gel solution to 4.0, and add sodium chloride to the adjusted solution, and the concentratio...

example 3

[0021]First, measure 40mL soybean acid-soluble protein solution with a mass concentration of 20mg / L in a 250mL three-necked flask, stir it mechanically for 2 hours, put it in a water bath after stirring, set the temperature to 40°C and let it stand for 12 hours, and put it in the three-necked flask Pour the material into a centrifuge, separate at a speed of 9000r / min for 20min, collect the supernatant, and set aside; measure 60mL of a soybean polysaccharide solution with a mass concentration of 35mg / L, and mix it with the above supernatant at a volume ratio of 3:1. Stir evenly to obtain a mixed solution, adjust the pH value of the mixed solution to 4.0 with 5% hydrochloric acid by mass fraction, and mechanically stir for 3 hours. Stir and heat in a water bath at 85°C for 2 hours. After heating, a gel solution is obtained. Adjust the pH of the gel solution to 4.5, and add sodium chloride to the adjusted solution until the concentration of sodium chloride reaches 0.1mol / L. , put...

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Abstract

The invention discloses a method for preparing a biological gel profile control agent and belongs to the field of profile control agents. The method comprises the steps of mixing soybean acid-soluble protein and a soybean polysaccharide solution so as to prepare gel, then, mixing the gel with gelatin, adding a cross-linker, an initiator, a gelation promoting agent and the like into the mixture, carrying out a mixed reaction so as to prepare a gel profile control agent, and finally, carrying out drying treatment, packaging and storing, thereby preparing the biological gel profile control agent. The gel profile control agent prepared by the method can be naturally degraded, does not pollute environment, does not damage strata, is free of forbidden medicines and is used for improving the oil reservoir permeability during oil production so as to increase oil recovery rate.

Description

technical field [0001] The invention discloses a preparation method of a biogel profile control agent, belonging to the field of profile control agents. Background technique [0002] The profile control technology of water injection wells is a major technical measure for oil stabilization and water control when oilfield development enters the medium-high water cut period. For some special types of reservoirs that have been put into development in recent years, such as low-permeability reservoirs, ultra-low-permeability reservoirs, and high-temperature reservoirs, they gradually enter the medium-high water cut period after water injection development. For such reservoirs, it is difficult to meet the profile control requirements of the oilfield by using the existing profile control methods. However, after the long-term water injection development of the oilfield, the physical properties of the reservoir have changed greatly, especially the formation of high permeability and l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K8/514C09K8/516
CPCC09K8/514C09K8/516
Inventor 冯国强赵立强樊灵
Owner SOUTHWEST PETROLEUM UNIV