Volume 36 Issue 5
Oct.  2019
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WANG Shuyi, XU Mingbiao, YOU Fuchang, DENG Cong, WANG Hangzhi. A Laboratory Test Method for Predicting Mud Ball Generation in Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 600-604. doi: 10.3969/j.issn.1001-5620.2019.05.013
Citation: WANG Shuyi, XU Mingbiao, YOU Fuchang, DENG Cong, WANG Hangzhi. A Laboratory Test Method for Predicting Mud Ball Generation in Drilling Fluids[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 600-604. doi: 10.3969/j.issn.1001-5620.2019.05.013

A Laboratory Test Method for Predicting Mud Ball Generation in Drilling Fluids

doi: 10.3969/j.issn.1001-5620.2019.05.013
  • Received Date: 2019-05-13
  • Publish Date: 2019-10-30
  • When drilling soft mudstones, mud ball will be generated in the drilling fluid flowing upwards in the annulus. To predict the generation of mud balls in a drilling fluid, an evaluation procedure with test parameters was established using drilling fluid measuring apparatus. In the procedure, drilled cuttings containing water and steel balls are mixed together and tested on a hot rolling tester (to simulate the flow of cuttings downhole). Using this procedure, some drilling fluids were tested. Test results showed that this procedure is feasible in predicting the generation of mud balls in several kinds of drilling fluids. The test results conformed to what were observed in field operations. In laboratory test, it was found that conditions for a water base drilling fluid to generate mud balls during drilling were as follows:hot rolling at 90℃ for 20 min. the conditions for an oil base drilling fluid to generate mud balls were:ht rolling at 120℃ for 30 min. Experimental results obtained from this procedure can be used as a base on which drilling fluid is optimized for high efficiency and safe drilling operation.

     

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