Journal
JOURNAL OF PETROLEUM SCIENCE AND ENGINEERING
Volume 174, Issue -, Pages 1194-1207Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.petrol.2018.11.042
Keywords
Rate of penetration; PDM-Pressurized drilling tool; High-pressure water jet; Tool development; Field test
Categories
Funding
- Key Research and Development Plan of Shandong Province [2018GSF116005]
- Natural Science Foundation of Shandong Province [ZR2016EL10]
- Qingdao Applied Basic Research Program [16-5-1-37-jch]
- Natural Sciences and Engineering Research Council of Canada of Canada (NSERC)
- PetroTech Engineering Co., Ltd.
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In this study, a robust and pragmatic technique has been developed to experimentally and theoretically evaluate the performance of high-pressure water jet (HPWJ) dynamics in tight formations by use of a new downhole pressurized drilling tool (DPDT). Experimentally, principles and structure of the new DPDT are described, while well-designed tests are conducted to examine the effects of water jet velocity, dwell time, incident angle, and rock type on the rock-breaking volume at pressures higher than 100 MPa. Numerically, the smoothed particle hydrodynamics coupled with the finite element method has been used to quantify the rock-breaking volume as a function of the 1st principal stress under various conditions. The experimentally measured and numerically simulated rock-breaking volumes are in good agreement under the same conditions. As for a marble specimen, there is a rapid increase in rock-breaking volume at nozzle pressures higher than 150 MPa and dwell times shorter than 40 s. The optimal incident angle for the rock-breaking efficiency is found to be 77 degrees. With the same nozzle pressure and dwell time, the rock types can be ranked in terms of rock-breaking volume in the order of marble < sandstone < concrete < shale. Also, field tests of the DPDT have been successfully performed to enhance the rate of penetration (ROP) by 32.9-80.5% for different rock types compared with the traditional drilling methods.
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