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| Mechanism and experiment of physical leak resistance and sealing while drilling |
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XIONG Ji-you, PU Ke-yong, WANG Ping-quan, WANG Yan,CHEN Zhong
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(State Key Laboratory of Oil & Gas Reservoir Geology and Exploitation, Southwest Petroleum University，Chengdu 610500, China)
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| Abstract: |
| Based on the principal of physical leak resistance and sealing while drilling, the physical model was built. The analysis on leak resistance and sealing mechanism and practiced indoor experiment were curried out for the man-made sidewall which is created to the loss segment1 s sidewall by hydraulic energy of jetting. The results show that the independent researched experimental device is able to verify the mechanism of physical leak resistance and sealing. The determined drilling system of leak resistance and sealing while drilling is of low permeability，good sealing performance，and can form thin and sturdy sealing formation on the borehole wall to efficiently seal fractures. The forming of sealing formation enlarges the safe density window of drilling fluid. And the sealing formation has high stiffness and stability and its bearing capacity is up to 6 MPa,the result of leak resistance and sealing while drilling is satisfied. |
| Key words: leak resistance while drilling physical method sealing drilling fluid system |
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