Volume 36 Issue 4
Aug.  2019
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SHU Yiyong, ZHOU Huaan, SUN Jun, YAN Zhihang, XU Sixu, SHAO Ping. Laboratory Evaluation and Application of A Raw Bentonite Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 459-462,467. doi: 10.3969/j.issn.1001-5620.2019.04.011
Citation: SHU Yiyong, ZHOU Huaan, SUN Jun, YAN Zhihang, XU Sixu, SHAO Ping. Laboratory Evaluation and Application of A Raw Bentonite Drilling Fluid[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(4): 459-462,467. doi: 10.3969/j.issn.1001-5620.2019.04.011

Laboratory Evaluation and Application of A Raw Bentonite Drilling Fluid

doi: 10.3969/j.issn.1001-5620.2019.04.011
  • Received Date: 2019-02-06
  • Publish Date: 2019-08-30
  • Wells drilled in the Dabei block in Tarim Basin have big hole sizes and the top formations have gravels in them, making it difficult for the drilling fluids to carry out drilled cuttings. Pipe sticking by settled cuttings and differential pipe sticking may be encountered because of the big hole sizes and gravels. The OCMA bentonite (conforms to OCMA standard or API standard) presently in use has limited viscosifying effect in KCl polymer drilling fluids; drilling fluids formulated with OCMA bentonite have low viscosity and gel strength, and high filtration rate, and are thus not suitable for use in Dabei block where big holes are drilled in the piedmont structure. To address this problem, raw bentonite is used to replace the OCMA bentonite in formulating drilling fluid. The causes of OCMA bentonite losing its viscosity are analyzed, and the drilling fluids formulated with raw bentonite are evaluated for their rheology, wall building ability, compatibility and saltwater contamination resistance. The particle size distribution and specific surface area of the raw bentonite are studied. Field application shows that drilling fluids formulated with raw bentonite have better viscosifying effect and lower filtration rate than drilling fluids formulated with OCMA bentonite. Use the raw bentonite formulated drilling fluids, downhole conditions are much safer, sand carrying requirement by large hole drilling can be satisfied, and gage hole can be obtained. Field application of the raw bentonite drilling fluids indicates that they are worth spreading.

     

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