Volume 35 Issue 5
Sep.  2018
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WU Guang, RONG Xinming, ZHOU Hongyu, BAI Bing, ZHANG Bo, WANG Chunlin. Application of An Invert Emulsion in Diverted Acidizing of High Temperature Offshore Sandstone Reservoirs[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 109-114,120. doi: 10.3969/j.issn.1001-5620.2018.05.021
Citation: WU Guang, RONG Xinming, ZHOU Hongyu, BAI Bing, ZHANG Bo, WANG Chunlin. Application of An Invert Emulsion in Diverted Acidizing of High Temperature Offshore Sandstone Reservoirs[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(5): 109-114,120. doi: 10.3969/j.issn.1001-5620.2018.05.021
shu

Application of An Invert Emulsion in Diverted Acidizing of High Temperature Offshore Sandstone Reservoirs

doi: 10.3969/j.issn.1001-5620.2018.05.021

  • 1. China Offshore Service Limited Co., Tianjin 300459;

  • 2. CNOOC(China) Co., Ltd. Zhanjiang Branch, Zhanjiang, Guangdong 524057;

  • 3. CCNOOC(China) Co., Ltd. Tianjin Branch, Tianjin 300459

  • Received Date: 2018-05-05
  • Publish Date: 2018-09-30
    Abstract
  • Diversion agents commonly used in present acidizing operations are unable to be easily and effectively used in acidizing high temperature offshore sandstone reservoirs. An invert emulsion diverting system has been developed with an active diesel oil and formation water to overcome this defciency. The volumetric ratio of the active diesel oil and formation water is 3:7 in the emulsion which has viscosity of 40 mPa·s even shearing at 170 s-1 under 130℃. Single barrel core test results showed that the permeability of simulated cores of water zones was reduced by more than 80%, and the permeability of simulated cores of oil zones reduced by less than 21.6%. Parallel dual-barrel core test results showed that the rate of diversion of the emulsion to low permeability pay zones was greater than 80%. Diverted acidizing physical simulation experimental results showed that after diverted acidizing with the emulsion, the permeability of low permeability pay zones was increased by about 170%, and the permeability of high permeability water zones reduced by about 60%. This technology has been applied in Nanhai West Oilfeld, the oil production rate was increased by 103.3 m3/d, and the water cut was reduced by 18.8%, indicating that the technology is worth spreading.

     

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