Volume 38 Issue 5
Sep.  2021
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WANG Jingpeng, XIONG Youming, LU Zongyu, et al.Study on salt-resistant high density cement slurry technology for ultra-deep wells [J]. Drilling Fluid & Completion Fluid，2021, 38（5）：634-640 doi: 10.3969/j.issn.1001-5620.2021.05.015
Citation: WANG Jingpeng, XIONG Youming, LU Zongyu, et al.Study on salt-resistant high density cement slurry technology for ultra-deep wells [J]. Drilling Fluid & Completion Fluid，2021, 38（5）：634-640 doi: 10.3969/j.issn.1001-5620.2021.05.015
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Study on Salt-Resistant High Density Cement Slurry Technology for Ultra-Deep Wells

doi: 10.3969/j.issn.1001-5620.2021.05.015
  • 1.

    State Key Laboratory of Oil & Gas Geology and Exploration, Southwest Petroleum University, Chengdu, Sichuan 610500

  • 2.

    Research Institute of Engineering Technology, Xinjiang Oilfield Company,PetroChina, Karamay, Xinjiang 834000

  • 3.

    Western Drilling and Cementing Engineering, PetroChina, Karamay ,Xinjiang 834000

  • Received Date: 2021-06-29
  • Publish Date: 2021-09-30
    Abstract
  • Cementing of ultra-deep wells in the Keshen block in Tarim Basin is faced with many downhole problems such as salt and gypsum formation to be cemented, narrow clearance between casing string and borehole walls, high pressure, high temperature and big temperature difference etc., and poor quality of well cementing job is frequently seen in this area. Several measures have been taken to solve the problems encountered in well cementing. First, the borehole to be cemented was well prepared by engineered wiper trip, the formula for calculating the stiffness ratio was revised and the running of casing string was well controlled. Second, Laboratory experiment was conducted in selecting weighting agents and cement additives that are resistant to salt contamination and high temperature. Third, specific techniques were adopted to improve the resistance to high temperature and strength decline of set cement. Based on the experiment, an ultra-high density cement slurry was developed. Laboratory evaluation showed that this cement slurry has a fluidity of 18-22 cm. The difference of density between the top and the bottom of the cement slurry is 0.03 g/cm3. It has many advantages such as good flowability, high stability, good gas-channeling prevention capacity, high early strength and no long-term strength decline. The cementing technology based on this cement slurry and measures of using it formed the base of high quality well cementing job in Keshen block where ultra-deep wells were drilled through salt and gypsum formations. Five well times of field application gave high quality cementing job as indicated by sonic logging. The technology for cementing ultra-deep well penetrating salt/gypsum formations and with narrow clearance between liner string and borehole walls not only helped solve the difficulties encountered in well cementing, but also helped cement the high-pressure saltwater zones, ensuring the safe and efficient development of the Keshen block.

     

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