Concentration Detection and Molecular Structure Identifcation of Guar Gum in Fracturing Flowback Fluids

SI Shaoxiong; ZHANG Zhenzhu; WANG Yu; GUO Jinzhou; WU Yonghua; GONG Zhaobo

doi:10.3969/j.issn.1001-5620.2018.05.022

Volume 35 Issue 5

Sep. 2018

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SI Shaoxiong, ZHANG Zhenzhu, WANG Yu, GUO Jinzhou, WU Yonghua, GONG Zhaobo. Concentration Detection and Molecular Structure Identifcation of Guar Gum in Fracturing Flowback Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 115-120. doi: 10.3969/j.issn.1001-5620.2018.05.022

Citation:

SI Shaoxiong, ZHANG Zhenzhu, WANG Yu, GUO Jinzhou, WU Yonghua, GONG Zhaobo. Concentration Detection and Molecular Structure Identifcation of Guar Gum in Fracturing Flowback Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 115-120. doi: 10.3969/j.issn.1001-5620.2018.05.022

Citation:

SI Shaoxiong, ZHANG Zhenzhu, WANG Yu, GUO Jinzhou, WU Yonghua, GONG Zhaobo. Concentration Detection and Molecular Structure Identifcation of Guar Gum in Fracturing Flowback Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 115-120. doi: 10.3969/j.issn.1001-5620.2018.05.022

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Concentration Detection and Molecular Structure Identifcation of Guar Gum in Fracturing Flowback Fluids

doi: 10.3969/j.issn.1001-5620.2018.05.022

1. Xinjiang Laboratory of Petroleum Reserve in Conglomerate, Karamay 834000;
2. Experimental Detection Research Institute, Xinjiang Oilfeld Company, Karamay 834000

Received Date: 2018-07-25
Publish Date: 2018-09-30

Abstract

Abstract

The main component in fracturing flowback fluids is guar gum, the detection of its effective content and the change of its molecular structure are of importance in subsequent treatment of the flowback fluids. Based on the chemical properties of guar gum, anthrone colorimetry has been selected for use in detecting the concentration of guar gum in fracturing flowback fluids. The linear correlation coeffcient of the standard curve established is 0.999 2, and the percent recovery is between 96.5% and 101.1%. This method has a high repeatability and is accurate and reliable. Using GPC and LC/Q-TOF-MS method, the changing of the molecular weight and molecular structure of the guar gum in the fracturing flowback fluid was identifed. It was found that the standard curve linear correlation coeffcient of using GPC to measure the molecular weight of guar gum was 0.995 5. The relative molecular weight of the guar gum used in Mahu area was about 840,000, and the content of the high molecular weight guar gum in the flowback fluids was decreasing obviously with time. The B-O bond in the molecules of guar gum can be broken preferentially by adding oxidizing gel breaker, and the guar gum is then turned into PEG complex.
- Fracturing flowback fluid,
- Guar gum,
- Content,
- Change of molecular weight,
- Structure identifcation

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References(22)

References

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