Volume 38 Issue 2
Aug.  2021
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2021  >  38(2): 183-188
HU Zubiao, ZHANG Jianqing, WANG Qingchen, MENG Fanjin, HOU Bo, ZHANG Qin, QU Yanping. Water Base Drilling Fluid Technology for Ultra-Long Horizontal Drilling in a Tight Gas Well in Changqing Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 183-188. doi: 10.3969/j.issn.1001-5620.2021.02.009
Citation: HU Zubiao, ZHANG Jianqing, WANG Qingchen, MENG Fanjin, HOU Bo, ZHANG Qin, QU Yanping. Water Base Drilling Fluid Technology for Ultra-Long Horizontal Drilling in a Tight Gas Well in Changqing Oilfield[J]. DRILLING FLUID & COMPLETION FLUID, 2021, 38(2): 183-188. doi: 10.3969/j.issn.1001-5620.2021.02.009
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Water Base Drilling Fluid Technology for Ultra-Long Horizontal Drilling in a Tight Gas Well in Changqing Oilfield

doi: 10.3969/j.issn.1001-5620.2021.02.009

  • CCDC Changqing General Drilling Company, Xi'an, Shaanxi 710018

  • Received Date: 2020-12-01
    Abstract
  • Changqing Oilfield has in the year 2020 drilled three wells with ultra-long horizontal sections in its tight gas well block, the lengths of the horizontal sections are 3321 m, 4118 m and 4466 m, respectively. These long horizontal sections were all drilled with water base muds, and each of the horizontal lengths has consecutively set a new record of the longest horizontal section of onshore wells in Asia. Long horizontal section drilling was faced with challenges such as friction reduction, hole cleaning and borehole wall stabilization. Specific studies were conducted to deal with these difficulties based on the structures of the formation rocks. As a result, a CQSP-RH drilling fluid and technologies for hole cleaning and wellbore stabilization in ultra-long horizontal well drilling were presented. Field application of the technologies and the CQSP-RH drilling fluid has produced good results, the horizontal section of the well was stable during drilling. When running the drill string into the hole, the friction of the drill string encountered was controlled at 500 kN in the open hole, and 350 kN in the cased hole. The well was successfully completed. With more and more development activity in Changqing oilfield going on, long horizontal well drilling technology has to be adopted to develop the water resource conservation and the forest regions and to increase the production of a single well. The successful drilling of these wells has provided a model and an arsenal of technologies for the subsequent development of the oil and gas field.

     

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