Volume 36 Issue 6
Dec.  2019
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YAO Qian, XU Mingbiao, YOU Fuchang. Study on Bit Balling in Drilling with Silicate Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 700-705. doi: 10.3969/j.issn.1001-5620.2019.06.007
Citation: YAO Qian, XU Mingbiao, YOU Fuchang. Study on Bit Balling in Drilling with Silicate Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(6): 700-705. doi: 10.3969/j.issn.1001-5620.2019.06.007
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Study on Bit Balling in Drilling with Silicate Drilling Fluid

doi: 10.3969/j.issn.1001-5620.2019.06.007

  • 1. PetroleumEngineeringCollege, Yangtze University, Wuhan, Hubei 430100;

  • 2. Hubei Cooperative Innovation Center of Unconventional Oil and Gas, Yangtze University, Wuhan, Hubei 430100

  • Received Date: 2019-07-23
  • Publish Date: 2019-12-30
    Abstract
  • Silicate drilling fluid is always used to drill mudstone and shale formations because of its excellent inhibitive capacity. A drawback of the silicate drilling fluid is the ease of bit balling. By analyzing the causes of bit balling using silicate drilling fluid, a laboratory experiment was designed to study the factors affecting the bit balling tendency of using silicate drilling fluid. In the experiment, mud balls of 6-10 mesh, made from bentonite, were used to simulate drilled cuttings. Steel balls of 25 mm and aging cells were used to simulate the conditions prevailing downhole. Several factors, such as the concentration of silicate, the module of the silicate, bentonite concentration, KCl concentration and addition of different bit balling preventing agents were studied for their effects on the occurrence of bit balling. The experimental results showed that the effect of the module of the silicate on bit balling can be ignored. The likelihood of bit balling increased with increase in the concentration of silicate; when the concentration of silicate was more than 9%, the severity of bit balling did not change greatly anymore. The concentration of silicate was suggested to be between 3% and 5%. With the increase of the bentonite content, the diameters of the mud balls reduced first and then increased. When 1% bentonite was used in the mud, the diameter of the mud balls became minimum. KCl at certain range of concentration can mitigate the occurrence of bit balling; excessive use of KCl on the other hand accelerate the occurrence of bit balling. The optimum concentration of KCl was 3%-6%. 3% WETMINE (a bit balling preventing agent and fast drilling agent) in the silicate drilling fluid can effectively prevent the occurrence of bit balling on the surface of the steel balls. Taking into account the rheology of the drilling fluid, the concentrations of the key additives used in the silicate drilling fluid were determined to provide a reference for selecting suitable additives for the silicate drilling fluid.

     

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