Petroleum Reservoir Evaluation and Development >
2021 , Vol. 11 >Issue 4: 527 - 535
DOI: https://doi.org/10.13809/j.cnki.cn32-1825/te.2021.04.008
A new technology of plugging and collapse prevention with oil-based drilling fluid in Chongqing shale gas wells
Received date: 2020-08-14
Online published: 2021-08-19
During drilling the horizontal section of a shale gas well, oil-based drilling fluid is commonly used in China in order to ensure downhole safety, especially to solve the problems of lost circulation and well collapse. Based on the study of chemical solidification plugging technology and the XRD（X-ray diffraction） analysis of Longmaxi shale samples in Chongqing area, the nano micron size plugging materials are selected to explore a new technology for plugging and collapse prevention of shale gas wells. Field application of chemical solidification technology effectively solves the lost circulation problem of a well in Jiaoye, and meet the requirements of subsequent construction. In the process of drilling, the polysilicon fiber and micro-nano plugging agent selected in the laboratory not only completely control the collapse and block falling, but also reduce the daily average drilling fluid consumption by 1/3, so as to achieve the purpose of anti-seepage and anti-collapse. It is proved that chemical solidification and micro-nano plugging are effective methods to solve the plugging and collapse prevention of shale gas wells, which play a positive role in the development of shale gas wells in Chongqing area.
Liang CHEN , Jinke HU , Dong GENG , Ziyu LI . A new technology of plugging and collapse prevention with oil-based drilling fluid in Chongqing shale gas wells[J]. Petroleum Reservoir Evaluation and Development, 2021 , 11(4) : 527 -535 . DOI: 10.13809/j.cnki.cn32-1825/te.2021.04.008
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