Volume 35 Issue 6
Nov.  2018
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2018  >  35(6): 65-70
DONG Bingqiang, QIU Zhengsong, LU Zhaohui, ZHANG Ye, DENG Zhi, SUN Zening, ZHANG Wei. Damage Mechanisms Determination for Tight Sands Gas Reservoir in Block Linxing and Drill-in Fluid Optimization for Protection of the Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 65-70. doi: 10.3969/j.issn.1001-5620.2018.06.012
Citation: DONG Bingqiang, QIU Zhengsong, LU Zhaohui, ZHANG Ye, DENG Zhi, SUN Zening, ZHANG Wei. Damage Mechanisms Determination for Tight Sands Gas Reservoir in Block Linxing and Drill-in Fluid Optimization for Protection of the Reservoir[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(6): 65-70. doi: 10.3969/j.issn.1001-5620.2018.06.012
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Damage Mechanisms Determination for Tight Sands Gas Reservoir in Block Linxing and Drill-in Fluid Optimization for Protection of the Reservoir

doi: 10.3969/j.issn.1001-5620.2018.06.012

  • 1. National and Local Joint Engineering Research Center of Shale Gas Exploration and Development, Chongqing Geology and Mineral Research Institute, Chongqing 401120;

  • 2. Key Laboratory of Shale Gas Exploration, Ministry of Land and Resources, Chongqing 400042;

  • 3. China University of Petroleum(East China), Qingdao, Shandong 266580;

  • 4. China United Coalbed Methane Corporation Ltd., Beijing 100011;

  • 5. Oilfield Chemistry R & D Institute, COSL, Yanjiao, Hebei 065201

  • Received Date: 2018-08-24
  • Publish Date: 2018-11-30
    Abstract
  • Drilling fluid invasion during drilling in tight sands gas reservoirs causes serious formation damage problem. Using core analysis and core flow experiment technologies, main damage mechanisms were determined for the tight sands gas reservoir in Block Linxing. Technical difficulties in field drilling fluid operations were summarized and analyzed, and a drill-in fluid for the protection of the reservoir was formulated based on optimization. Laboratory study showed that the rocks in the tight sands gas reservoir in Linxing have medium-coarse sand structure, compact cementation, fine pore throat and sensitive clay minerals. Several kinds of formation damage are found in the reservoir rocks, such as serious water block damage, moderately strong water sensitivity and stress sensitivity damage (critical pressure is 7.0 MPa), moderately weak flow rate sensitivity (critical flow rate is 0.75 mL/min), salt sensitivity (critical salinity is 7,500 mg/L), sensitivity to alkalinity (critical pH value is 10.0) and sensitivity to mud acid. Technical difficulties found in Linxing include formation damage, mud losses, wellbore collapse, high torque and drag, and hole cleaning. The optimized drill-in fluid has good plugging capacity and low surface tension of filtrate (23.3 mN/m), and is thus able to minimize the invasion of particles and to weaken water block effect. The percent recovery of permeability of reservoir rocks was raised to 91.3% of the original value, demonstrating the reservoir protection capacity of the drill-in fluid. Field application of the drill-in fluid showed that the optimized drill-in fluid met the needs of drilling in complex formations or horizontal drilling.

     

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