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Detection method of polyacrylamide concentration in tertiary oil recovery fluid

A technology for polyacrylamide and concentration detection, which is applied in the direction of analyzing materials through chemical reactions and observing the influence of chemical indicators on materials, etc. It can solve the problems of production fluid errors, different molecular weights of polymers, polymer Concentration detection has a great influence, and achieve the effect of improving detection accuracy and eliminating errors

Active Publication Date: 2016-08-31
PETROCHINA CO LTD +1
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AI Technical Summary

Problems solved by technology

[0009] However, the above two detection methods use chemical agents to react with the amide groups in polyacrylamide, so the molecular weight of the polymer is different, which has a great impact on the detection of the polymer concentration
In practice, polyacrylamide undergoes mechanical degradation and microbial degradation during the injection process, and the molecular weight of the polymer in the oilfield production fluid will be greatly reduced. Therefore, the above-mentioned turbidity method or starch-cadmium iodide method is used to detect the degraded Produced fluid will produce a large error

Method used

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  • Detection method of polyacrylamide concentration in tertiary oil recovery fluid
  • Detection method of polyacrylamide concentration in tertiary oil recovery fluid
  • Detection method of polyacrylamide concentration in tertiary oil recovery fluid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1 nephelometry detects polymer concentration

[0025] Select three molecular weight polymers of medium, high and ultra-high fractions (the specific molecular weight polymer selected when drawing the standard curve is the same or substantially close to the molecular weight of the polymer injected in this area), and prepare 100mg / L, 150mg / L, 200mg / L, 250mg / L, 300mg / L polyacrylamide standard solution. Standard solutions of each concentration were divided into two groups, A and B. Group A was not subjected to shearing treatment; group B used a high-speed shearing machine to shear polymer standard solutions of different concentrations for 30 seconds at a speed of 11,000 rpm.

[0026] The absorbance value of each concentration standard solution was measured by turbidity method, the concentration standard curve was made respectively, and the detection error of polymer concentration before and after shearing was observed. Refer to Table 1, Table 2, and Table 3 for ...

Embodiment 2

[0037] Embodiment 2 starch-cadmium iodide method detects polymer concentration

[0038] Select three molecular weight polymers of medium fraction, high fraction and ultra-high fraction, and prepare 10mg / L, 20mg / L, 30mg / L, 40mg / L, 50mg / L, 60mg / L, 70mg / L, 80mg / L, 90mg / L, 100mg / L polyacrylamide standard solution. Standard solutions of each concentration were divided into two groups, A and B. Group A was not subjected to shearing treatment; group B used a high-speed shearing machine to shear polymer standard solutions of different concentrations for 30 seconds at a speed of 11,000 rpm.

[0039] The absorbance value of each concentration standard solution was measured by the starch-cadmium iodide method, and the concentration standard curve was prepared respectively, and the detection error of the polymer concentration before and after shearing was observed. Refer to Table 5, Table 6, and Table 7 for the determination results of medium score, high score and super high score. For...

Embodiment 3

[0050] Embodiment 3 Changes the influence of shear time and shear velocity on polymer solution

[0051] 1) Cutting time

[0052] Use medium fraction polymer, high fraction polymer and super high fraction polymer respectively to prepare 200mg / L solution, use high-speed shearing machine at 11000 rpm, shear for different time, and detect the polymer viscosity after shearing and molecular weight changes.

[0053] Table 9 Shear time influence on polymer

[0054]

[0055] From the experimental results, the shearing time has little effect on the polymer viscosity, and the molecular weight of the polymer does not change much after shearing for 30s, which is closest to the molecular weight of the polymer in the production fluid (after testing, the molecular weight of the polymer in the actual production fluid is about 300-400 million), therefore, the present invention selects the cutting time to be at least 30s.

[0056] 2) Shear speed

[0057] Use medium-fraction polymer, high-...

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Abstract

The invention provides a detection method of polyacrylamide concentration in a tertiary oil recovery liquid. The method comprises: drawing a standard curve, preparing standard polyacrylamide solutions of different concentrations, shearing for at least 30 seconds under rotate speeds of 11000-22000 r / min, determining light absorption values of the solutions, drawing a standard curve, detecting to-be-detected samples, determining light absorption values of the to-be-detected samples, and determining the concentration of the polyacrylamide of the samples referring to the drawed standard curve, wherein a nephelometry or a starch-cadmium iodide method is used to determine the light absorption values of the solutions. According to the invention, the method can eliminate relatively large errors of polymer concentrations of the recovery liquid determined by the traditional nephelometry and the starch-cadmium iodide methods, thereby increasing a detection precision of the polymer concentrations of the recovery liquid.

Description

technical field [0001] The present invention relates to a method for detecting the concentration of polymer produced fluid in tertiary oil recovery, in particular to a method for detecting the concentration of polyacrylamide in produced fluid in polymer flooding field production in tertiary oil recovery Background technique [0002] With the improvement and industrialization of polymer flooding technology in oil fields, polyacrylamide is widely used in the tertiary recovery of oil fields. In polymer flooding technology, partially hydrolyzed polyacrylamide (HPAM) is a chemical thickener, and a small amount of HPAM dissolved in water can significantly increase its viscosity, which is beneficial to improve its sweep efficiency, thereby increasing oil recovery. Therefore, in the oil flooding process, it is often necessary to measure the concentration of HPAM in the produced fluid to judge the flow and degradation of the polymer solution during the oil flooding process and estima...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/79G01N21/83
Inventor 孙琦张晓晨赵劲毅孙远卓黄文庆李国桥纪海龙贾凌志郭明
Owner PETROCHINA CO LTD
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