Volume 35 Issue 3
May  2018
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YANG Yong, LUO Ming, WEI Anchao, HAN Cheng, LI Zhujun. Study and Application of Well Test Fluid for HTHP Wells in Ying-Qiong Basin in South China Sea[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 124-128. doi: 10.3969/j.issn.1001-5620.2018.03.022
Citation: YANG Yong, LUO Ming, WEI Anchao, HAN Cheng, LI Zhujun. Study and Application of Well Test Fluid for HTHP Wells in Ying-Qiong Basin in South China Sea[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(3): 124-128. doi: 10.3969/j.issn.1001-5620.2018.03.022

Study and Application of Well Test Fluid for HTHP Wells in Ying-Qiong Basin in South China Sea

doi: 10.3969/j.issn.1001-5620.2018.03.022
  • Received Date: 2018-01-22
  • Publish Date: 2018-05-30
  • Drilling fluids with good thermal stability, settling stability, CO2 contamination resistance and reservoir protection are required to drill wells in the Ying-Qiong Basin in South China Sea where high temperature, high pressure, CO2, and low porosity/low permeability prevail. Downhole troubles have been frequently encountered because of lack of special high temperature high pressure (HTHP) test fluid previously. In many years of study and field practices a set of HTHP test fluid technology has been developed by introducing a high temperature filter loss reducer Calovis into drill-in fluids used, increasing the pH value of the test fluid appropriately, controlling the MBT of the test fluids in a reasonable range, weighting the test fluids with ultra-fine barite, and enhancing the flowback properties of the test fluids. The test fluids have been successfully used on 2 HTHP exploratory wells in the Ying-Qiong Basin. One of the well had CO2 content of 23%, bottom hole temperature over 200℃, and the density of the test fluid used was 2.33 g/cm3. Perforation pressure and annular pressure were transmitted normally. After standing for 7 days, the packer was retrieved successfully, and the properties of the test fluid were not deteriorating. The tested production rate was higher than the expected production rate. All test tasks have been satisfactorily completed.

     

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