Study and Application of an Oil-based Gel Fluid for Sealing Induced Micro-fractures

The Longmaxi formation in the Changning block（Sichuan Oilfield） is drilled with oil-based drilling fluids. This formation is developed with microfractures and hence mud losses have frequently happened in the past. Mud losses have been controlled with bridging particles formulated in oil-based slurri...

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Bibliographic Details
Published inZuan jing ye yu wan jing ye Vol. 40; no. 4; p. 446
Main Authors Li, Wenzhe, Fu, Zhi, Zhang, Zhen, Liu, Yingmin, Wu, Shuang
Format Journal Article
LanguageChinese
Published Renqiu Bohai Drilling Engineering Institute 01.01.2023
Subjects
Animal fat
Compressive strength
Drilling
Drilling fluids
Drilling muds
Epoxy resins
Fractures
Laboratory tests
Loss control
Microfracture
Oil fields
Petroleum engineering
Slurries
Thickening
Vegetable oils
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Summary:The Longmaxi formation in the Changning block（Sichuan Oilfield） is drilled with oil-based drilling fluids. This formation is developed with microfractures and hence mud losses have frequently happened in the past. Mud losses have been controlled with bridging particles formulated in oil-based slurries, which has been proved unsuccessful and time consuming. To deal with this problem, a compound oil-based gel has been developed with animal fats, vegetable oils and epoxy resin. This oil-based gel can invade into the fractures in the formation rocks to seal them off, thereby increasing the success rate of mud loss control. Considering the practicability of field application, the compressive strength, thickening time and performance against contamination from oilbased muds of this gel were evaluated in laboratory test, and its ability to combat mud losses was also evaluated. The laboratory test results have shown that the gel has compressive strength of 5.1 MPa, and the gelling time can be controlled at more than
ISSN:1001-5620