Volume 35 Issue 1
Jan.  2018
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LIU Yang, XIAN Ming, FENG Yuqi. Causes of Trapped Annular Pressure in High Pressure Gas Wells in Central Sichuan and Well Cementing Solution[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 77-82. doi: 10.3969/j.issn.1001-5620.2018.01.015
Citation: LIU Yang, XIAN Ming, FENG Yuqi. Causes of Trapped Annular Pressure in High Pressure Gas Wells in Central Sichuan and Well Cementing Solution[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(1): 77-82. doi: 10.3969/j.issn.1001-5620.2018.01.015

Causes of Trapped Annular Pressure in High Pressure Gas Wells in Central Sichuan and Well Cementing Solution

doi: 10.3969/j.issn.1001-5620.2018.01.015
  • Received Date: 2017-11-03
  • Publish Date: 2018-01-30
  • High pressure gas wells drilled in the central Sichuan Basin penetrated multiple pay zones and encountered multiple formation pressure systems. Shallow gases above the Xujiahe Formation and high pressure formations such as the Jialingjiang Formation and the Feixianguan Formation have active gas show. Well cementing job quality has been good, yet there have 12 wells with abnormal pressure in the annulus B and annulus C. By analyzing the well cementing operations, the sources of gas causing the annular pressure and the time for the pressure trapped in the annuluses, and using apparatus and software for cement sheath integrity evaluation to analyze the effects of subsequent work conditions on the sealing integrity of cement sheath, it is inferred that the main causes of pressure trapped in annulus C are that the mechanical performance of the conventional set cement does not satisfy the needs for sealing interlayers in high pressure gas wells, and the integrity of the cement sheath is thus damaged during pipe string pressure test after well cementing, and decrease in mud weight further deteriorates the situation. It is also inferred that pressure trapped in annulus B because of poor job quality in cementing the φ177.8 mm liner string and the weakening of the cement bonding in subsequent operations. Based on the analyses, a micro-expanding cement slurry with good toughness has been developed to fast cement the well to prevent gas from invading into the borehole and to prevent gas channeling from happening. This cement slurry has been applied on 12 wells into which packer type liner hangar was run. Rate of certified job quality of cementing the φ177.8 mm liner string as measured with acoustic amplitude evaluation was increased from 52.98% to 73.18%, indicating that trapped annular pressure problem has been satisfactorily resolved.

     

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