Volume 34 Issue 3
May  2017
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XU Pengchen, CHEN Ning, HU Jingdong, CHEN Biwu, WANG Lili, HUA Zhichao, SANG Junyuan. Study and Field Application of Degradable Clear Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(3): 27-32. doi: 10.3969/j.issn.1001-5620.2017.03.005
Citation: XU Pengchen, CHEN Ning, HU Jingdong, CHEN Biwu, WANG Lili, HUA Zhichao, SANG Junyuan. Study and Field Application of Degradable Clear Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(3): 27-32. doi: 10.3969/j.issn.1001-5620.2017.03.005
shu

Study and Field Application of Degradable Clear Drilling Fluid

doi: 10.3969/j.issn.1001-5620.2017.03.005

  • 1. The Fourth Drilling Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552;

  • 2. CBM Division of PetroChina Huabei Oilfield Company, Jincheng, Shanxi 048000

  • Received Date: 2017-03-01
  • Publish Date: 2017-05-31
    Abstract
  • A degradable clear drilling fluid has been developed with a gel enhancer BZ-2 and a film fixating agent GMJ to resolve the contradiction between the safety of drilling operation and the protection of coal beds in coal-bed methane drilling. Laboratory experiments were done to evaluate BZ-2 and GMJ for their inhibitive capacity, rheology, residue contents, and their influences on the strengths of formation cores. The experimental results showed that the clear drilling fluid had percent shale recovery of 93.5%, YP/PV ratio of 0.93 Pa/mPafs, gel strengths of 2.5 Pa/3.0 Pa, yield point of 20.5 Pa, API filter loss of less than 12 mL, and residue content of 4.5 mg/L. The strength of the cores tested increased by 16.7%. This drilling fluid has been tested on 4 wells in the Zhengzhuang block, south of Qinshui basin in Shanxi Province. The test has successfully resolved the problems of drilling safety and coalbed protection in multilateral well drilling. Daily gas production rate has been increased by 2 times more than that of the wells nearby, and the calculated constant rate of gas production was between 3,000-5,000 m3/d, suggesting a good prospect of promotion.

     

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