Volume 35 Issue 2
Mar.  2018
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BU Jiyong, ZHAO Chunhua, TONG Kun, SUN Dejun. Development and Application of Oil Base Mud Cleansing Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(2): 68-72. doi: 10.3969/j.issn.1001-5620.2018.02.011
Citation: BU Jiyong, ZHAO Chunhua, TONG Kun, SUN Dejun. Development and Application of Oil Base Mud Cleansing Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2018, 35(2): 68-72. doi: 10.3969/j.issn.1001-5620.2018.02.011

Development and Application of Oil Base Mud Cleansing Fluid

doi: 10.3969/j.issn.1001-5620.2018.02.011
  • Received Date: 2017-10-05
  • Publish Date: 2018-03-30
  • A thermal stable salt-resistant oil base mud cleansing fluid, PF-MOCLEAN, has been developed with a nonionic surfactant Brij A and an ionic surfactant SJB, in an effort to overcome the problems of narrow range of applicable temperature and of losing efficacy in high salinity environment when micro emulsion oil base mud cleansing fluid is used. Laboratory study has been done on the effects of the quantity ratio and concentrations of the two surfactants on the cleansing efficiency of PF-MOCLEAN, and the optimum composition of PF-MOCLEAN was determined, that is, SJB:Brij A=2:1, and the total concentration of the two surfactants is 60%. PF-MOCLEAN, when in contact with oil base muds, automatically solubilizes oil phases to form a micro emulsion with ultra-low surface tension, high solubilizing power and high rate of diffusion. It effectively cleans off 95% oil base muds adhered on the surfaces of casing and borehole wall in a temperature range of 40-120℃ and in high salinity environment, meanwhile turns the surfaces of casing and borehole wall from being hydrophobic to hydrophilic, which is beneficial to reservoir protection and well cementing job. PF-MOCLEAN has been effectively used in South China Sea, showing prosperous future of application.

     

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