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1. The Research on Teeth Invade Bottomhole Rock Basing on Unified Strength Theory | |||
LI Wei,YAN Tie,Li Siqi | |||
Mine Engineering and Technology 18 March 2013 | |||
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Abstract:Considering the condition of the bottom hole pressure, basing on unified strength theory to analyze the mechanical process of teeth invade rock, build bottomhole rock intrusive equation with unified strength parameters and give intrusive coefficient without the impact of axial load, invasion depth and bit angle. The equation considers the impacts of intermediate stress on intrusive coefficient. The results of the equation and Mohr-Coulomb strength theory are identical when b equals to 0. Analyze the impact of angle of internal friction, fluid column pressure, pore pressure and bit angle on intrusive coefficient. The results show that with b, angle of internal friction and bit angle, fluid column pressure and pore pressure increasing, the intrusive coefficient increases, increases exponentially, increases linearly and decreases linearly respectively. | |||
TO cite this article:LI Wei,YAN Tie,Li Siqi. The Research on Teeth Invade Bottomhole Rock Basing on Unified Strength Theory[OL].[18 March 2013] http://en.paper.edu.cn/en_releasepaper/content/4528766 |
2. The Research on Smart Drill-in Fluid Design | |||
Li Zhiyong,Jiang Guancheng,Xie Shuixiang,He Nengju | |||
Mine Engineering and Technology 02 July 2010 | |||
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Abstract:There are continuous high concerns on formation protection technology in international petroleum engineering field. The reservoir drill-in fluid (RDF) is the first non-native fluid to contact formation, and which influences directly the ultimate capacity of oil and gas well. The paper discusses the smart RDF design method based on conventional drilling fluid. The designed RDF system is characterized as good formation damage control, as well as the performance easily adjusted for field application. The technology combines ideal packing technology with active calcium carbonate to obtain low permeability filter cake, high return permeability and low initial flowing pressure. The sized calcium carbonates contribute to develop sealing zone for preventing filtrate and solids from invading into formation, and the organophilic passageway in filter cake (the active calcium carbonate) is favorable to open automatically passageway for oil and gas during production. Different modifiers used to ground calcium carbonate surface modification are evaluated in laboratory. And the laboratory results show modified calcium carbonates are comfortable with conventional drilling fluids additives such as XC(Xanthan ), potassium polyacrylate(K-PAM), sodium carboxymethyl cellulose(Na-CMC). | |||
TO cite this article:Li Zhiyong,Jiang Guancheng,Xie Shuixiang, et al. The Research on Smart Drill-in Fluid Design[OL].[ 2 July 2010] http://en.paper.edu.cn/en_releasepaper/content/4377817 |
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