Fracturing Fluid Damage Evaluation and Microscopic Damage Mechanism Study for Expansion Tight oil Test Area of Long 26

QI Shengjin; JIANG Jianfang; JIANG Jie; CHU Zhenyu; LIU Qiujun; FENG Zhangyu; TANG Shan; HUANG Dengzhu

doi:10.12358/j.issn.1001-5620.2021.05.017

Volume 38 Issue 5

Sep. 2021

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QI Shengjin, JIANG Jianfang, JIANG Jie, et al.Fracturing fluid damage evaluation and microscopic damage mechanism study for expansion tight oil test area of long 26[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：648-656 doi: 10.12358/j.issn.1001-5620.2021.05.017

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QI Shengjin, JIANG Jianfang, JIANG Jie, et al.Fracturing fluid damage evaluation and microscopic damage mechanism study for expansion tight oil test area of long 26[J]. Drilling Fluid & Completion Fluid，2021, 38（5）：648-656 doi: 10.12358/j.issn.1001-5620.2021.05.017

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Fracturing Fluid Damage Evaluation and Microscopic Damage Mechanism Study for Expansion Tight oil Test Area of Long 26

doi: 10.12358/j.issn.1001-5620.2021.05.017

QI Shengjin^{1, 2},
JIANG Jianfang^{1, 2
,},
JIANG Jie^{1, 2},
CHU Zhenyu^{1, 2},
LIU Qiujun^{1, 2},
FENG Zhangyu^{1, 2},
TANG Shan^{1, 2},
HUANG Dengzhu^{1, 2}

1.
Unconventional Petroleum Research Institute, China University of Petroleum, Beijing 102249
2.
Key Laboratory of Ministry of Education in Petroleum Engineering, China University of Petroleum, Beijing 102249

Received Date: 2021-07-09
Accepted Date: 2021-06-18
Publish Date: 2021-09-30

Abstract

Abstract

Extension area of long 26 in Daqing oilfield is typical tight reservoir, which is more sensitive to fracturing fluid damage. According to ‘SY/T 5107-2005 Recommended practices on measuring the properties of water-based fracturing fluid’, the core displacement experiments of guar gum, high molecular polymer and surfactant fracturing gel-breaking fluids were conducted at reservoir temperature (90 ℃) with core flow meter, and the distribution of residue and residual gum of the three fracturing gel-breaking fluids in the cores and their damage degree to pore throats were evaluated with CT scanning. The results of core displacement experiments indicated that the core damage rates of guar gum, high molecular polymer and surfactant fracturing gel-breaking fluids were 43.5%, 24.3% and 13.1% respectively. The results of CT scanning showed that residues of guar gum and high molecular polymer fracturing gel-breaking fluids were concentrated in the first 1/10~2/5 and 1/2 sections of the core respectively, and the residues of surfactant fracturing gel-breaking fluid were less but penetrated into the core. The pore and the pore throat damage rates on cores of guar gum , high molecular polymer and surfactant fracturing gel-breaking fluids were 15.41% and 9.01%, 6.43% and 3.14%, 8.94% and 6.27% respectively. The analysis showed that the three kinds of fracturing gel-breaking fluids on reservoir cores were mainly liquid damage, followed by solid damage.
- Tight oil reservoir,
- Formation damage,
- Fracturing gel-breaking fluid,
- Core displacement experiment,
- CT scanning

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Fracturing Fluid Damage Evaluation and Microscopic Damage Mechanism Study for Expansion Tight oil Test Area of Long 26

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Fracturing Fluid Damage Evaluation and Microscopic Damage Mechanism Study for Expansion Tight oil Test Area of Long 26

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