Volume 37 Issue 2
Apr.  2020
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Article Navigation >  DRILLING FLUID & COMPLETION FLUID  > 2020  >  37(2): 239-243
JIA Jianchao, SHAN Baodong, AN Guoyin, YU Wanbao, WANG Yuanqing, LI Xiaoming, LIAO Hualin. Technology for Cementing Directional Wells Drilled for Salt Cavern Gas Storages in Jintan[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 239-243. doi: 10.3969/j.issn.1001-5620.2020.02.018
Citation: JIA Jianchao, SHAN Baodong, AN Guoyin, YU Wanbao, WANG Yuanqing, LI Xiaoming, LIAO Hualin. Technology for Cementing Directional Wells Drilled for Salt Cavern Gas Storages in Jintan[J]. DRILLING FLUID & COMPLETION FLUID, 2020, 37(2): 239-243. doi: 10.3969/j.issn.1001-5620.2020.02.018
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Technology for Cementing Directional Wells Drilled for Salt Cavern Gas Storages in Jintan

doi: 10.3969/j.issn.1001-5620.2020.02.018

  • 1. School of Petroleum Engineering, China University of Petroleum, Qingdao, Shandong 266580;

  • 2. Huabei Petroleum Administration Bureau Company Limited Jiangsu Gas Storage Branch Company, Zhenjiang, Jiangsu 212000;

  • 3. No.1 Cementing Branch of CNPC Bohai Drilling Engineering Company Limited, Renqiu, Hebei 062552

  • Received Date: 2019-12-15
  • Publish Date: 2020-04-28
    Abstract
  • To improve the utilization of salt rock resources, the second stage of the Phase 2 gas storage construction in Jintan used directional cluster well instead of vertical well previously used to build the gas storages. Cluster well gas storage helps maximize the storage capacity and gas production rate. Problems associated with directional well drilling are hole size of irregularity and eccentricity of casing string. As to well cementing, since the salt is buried in shallow depth with low temperature, cement slurry formulated with saltwater has poor stability at low temperatures, the filtration rate of the cement slurry is difficult to control, and the compressive strength of the cement slurry develops slowly. Losses of cement slurry in the second interval result in cement slurry that is unable to return to the surface. Based on the requirements of salt cavern gas storage on well cementing job, study was conducted on low temperature high strength cement slurry, viscosified saltwater spacer and well cementing operation techniques. The study results showed that the low temperature high strength saltwater cement slurry developed had good stability, fast developed compressive strength, and high later strength, satisfying the needs of cement slurry for cementing directional well for salt cavern gas storages. Viscosified saltwater spacer in combination with techniques for improving the centralization of casing string increased the displacing efficiency of fluid in washout sections and hole sections of irregular sizes, preventing choke and block during well cementing. Use of low flowrate displacement ensured the cement slurry to return to the surface, making the salt section effectively cemented. This well cement technology has been used for 11 times in the second stage of the Phase 2 gas storage construction, the quality of well cementing operation was significantly improved. This technology has provided a reference for other salt cavern gas storage construction.

     

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