Volume 33 Issue 5
Sep.  2016
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LIANG Wenli, SONG Jinchu, CHEN Zhiyuan, LIU Jing, MEI Luqiang. Oil Base Drilling Fluid for Drilling Shale Gas Wells in Fuling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 19-24. doi: 10.3969/j.issn.1001-5620.2016.05.004
Citation: LIANG Wenli, SONG Jinchu, CHEN Zhiyuan, LIU Jing, MEI Luqiang. Oil Base Drilling Fluid for Drilling Shale Gas Wells in Fuling[J]. DRILLING FLUID & COMPLETION FLUID, 2016, 33(5): 19-24. doi: 10.3969/j.issn.1001-5620.2016.05.004

Oil Base Drilling Fluid for Drilling Shale Gas Wells in Fuling

doi: 10.3969/j.issn.1001-5620.2016.05.004
  • Received Date: 2016-07-09
  • Publish Date: 2016-09-30
  • Horizontal drilling has been used in developing the block Jiaoshiba in Fuling, Chongqing. The horizontal section, more than 1,500 m in length, penetrated the lower Longmaxi mudstone formation, which has high clay contents, and is brittle and full of micro fractures. The vertical depths of the wells drilled in this area were deeper than 3,500 m. Deep well shale gas development in this area has been faced with difficulties such as high well temperature, cutting carrying, borehole wall collapse in some wells, over-pulls during tripping, and lost returns of muds in some wells, all of these have caused waste of manpower and material resources. To solve these problems, a diesel oil base drilling fluid has been studied for use in shale gas drilling. The diesel oil base drilling fluid formulated had good high temperature stability; at low oil/water ratio (70:30) the fluid was still stable. Two LCMs, were added in the oil base drilling fluid; one was a high purity ultra-fine CaCO3 mixed with an organic gel LCM which can plug fractures of 2 mm in width, and can stand pressure of 7 MPa. The other LCM, a nano graphite powder mixed with ultra-fine sepiolite fibers, can be used to plug micro fractures of 0.1 mm in width, and can stand pressure of 20 MPa. Field application demonstrated that this oil base mud greatly stabilized the borehole wall in easy-to-collapse hole sections, and reduced the average rate of hole diameter enlargement to less than 3%. Good lubricity of the mud made trip very smooth. The property of the mud was stable during the whole drilling period and was easy to maintain. Downhole problems previously encountered such as lost circulation and borehole wall instability were mitigated to acceptable levels. Field application proved the suitability of diesel oil base drilling fluid in shale gas horizontal drilling in Fuling area.


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