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Practice and understanding of sidetracking horizontal drilling in old wells in Sulige Gas Field, NW China
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ZHANG Jinwu,WANG Guoyong,HE Kai,YE Chenglin
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Table 2 Production statistics of sidetracking horizontal wells.
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Serial
number | Well | Date of
production | Before sidetracking | After sidetracking | December 31, 2017 | Daily gas pro-
duction/104 m3 | Cumulative gas production/104 m3 | Initial wellhead pressure/MPa | Initial daily gas production/104 m3 | Daily gas production/104 m3 | Production increment/104 m3 | | 1 | Su10-aCH | 2011-07-20 | 0 | 235 | 13.5 | 1.8 | 0 | 545 | | 2 | Su10-bCH | 2012-08-28 | 0.10 | 862 | 16.0 | 2.8 | 0.82 | 2 161 | | 3 | Su10-cCH | 2015-05-27 | 0 | 252 | 21.0 | 4.5 | 1.16 | 2 017 | | 4 | Su10-dCH | 2015-12-06 | 0 | 195 | 19.5 | 3.5 | 1.39 | 1 067 | | 5 | Su53-aCH | 2016-12-03 | 0 | 280 | 17.2 | 3.5 | 1.42 | 634 | | 6 | Su53-bCH | 2017-03-14 | 0.10 | 975 | 21.0 | 9.0 | 5.32 | 2 053 | | 7 | Su53-cCH | 2017-03-19 | 0.10 | 401 | 19.5 | 5.0 | 3.95 | 1 008 | | 8 | Su53-dCH | 2017-04-04 | 0.15 | 703 | 5.9 | 6.0 | 2.85 | 905 | | 9 | Su53-eCH | 2017-04-24 | 0.05 | 312 | 14.2 | 3.0 | 3.30 | 1 048 | | 10 | Su53-fCH | 2017-10-18 | 0.10 | 1 521 | 20.0 | 11.0 | 11.65 | 680 | | 11 | Su53-gCH | 2017-11-07 | 0.03 | 552 | 14.0 | 3.0 | 3.17 | 192 | | 12 | Su53-hCH | 2017-11-21 | 0.07 | 535 | 13.0 | 3.5 | 3.88 | 133 | | Average | | | 0.06 | 568 | 16.2 | 4.7 | 3.24 | 1 037 |
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