Volume 34 Issue 6
Nov.  2017
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WU Yang, XIAO Zhihai, SHEN Xiaogang, GUO Yibing, JIN Zhixuan. Study on Well Cementing Techniques for Wells with Lost Circulation in Jingnan Area[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(6): 95-99. doi: 10.3969/j.issn.1001-5620.2017.06.018
Citation: WU Yang, XIAO Zhihai, SHEN Xiaogang, GUO Yibing, JIN Zhixuan. Study on Well Cementing Techniques for Wells with Lost Circulation in Jingnan Area[J]. DRILLING FLUID & COMPLETION FLUID, 2017, 34(6): 95-99. doi: 10.3969/j.issn.1001-5620.2017.06.018
shu

Study on Well Cementing Techniques for Wells with Lost Circulation in Jingnan Area

doi: 10.3969/j.issn.1001-5620.2017.06.018

  • CCDC Changqing Cementing Company, Yulin, Shaanxi 710018

  • Received Date: 2017-07-21
  • Publish Date: 2017-11-30
    Abstract
  • A cementing slurry treated with light weight plastic beads has been developed to improve well cementing job quality of the gravel-packing section of a well in Jingnan block, Sulige gas field. Lost circulation has been frequently encountered in this area, hence different lost circulation materials (LCMs) were studied for their effects on the properties of the cementing slurry developed. Three LCMs, a plant particle (A), a mixed fiber QD-2 and a compound fiber DF-NIN, were studied through orthogonal experiment. It has been found that when the three LCMs were added into cement slurries in concentrations of 2%, 2% and 3% respectively, best performance of lost circulation control can be obtained, and the cement slurry had compressive strength of 7.6 MPa. In laboratory lost circulation test, the volume of slurry lost was greatly reduced, and the basic properties of the cement slurry were able to satisfy the needs of well cementing. A set of well cementing techniques were established based on the investigation of the geological characteristics of the formations. The cement slurry and the techniques developed have been applied in Jingnan area for 8 times, the percent of pass of cementing between cement sheath and casing string was 95%, and this number was 99% for the cementing between cement sheath and borehole wall, demonstrating that the light weight lost circulation control cement slurry is able to greatly improve the quality of cementing job in the gravel-packing section of a well, and satisfy the needs at utmost of sealing a whole well.

     

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