Volume 39 Issue 3
May  2022
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SUN Lulu, GENG Xiaoguang, SONG Tao, et al.Response surface optimization of biosafety disposal of waste water based drilling fluids for deep drilling[J]. Drilling Fluid & Completion Fluid，2022, 39（3）：327-333 doi: 10.12358/j.issn.1001-5620.2022.03.010
Citation: SUN Lulu, GENG Xiaoguang, SONG Tao, et al.Response surface optimization of biosafety disposal of waste water based drilling fluids for deep drilling[J]. Drilling Fluid & Completion Fluid，2022, 39（3）：327-333 doi: 10.12358/j.issn.1001-5620.2022.03.010
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Response Surface Optimization of Biosafety Disposal of Waste Water Based Drilling Fluids for Deep Drilling

doi: 10.12358/j.issn.1001-5620.2022.03.010

  • Drilling Engineering Technology Research Institute of Daqing Drilling Engineering Company of China National Petroleum Corporation, Daqing, Heilongjiang 163511

  • Received Date: 2021-12-06
  • Rev Recd Date: 2022-01-15
    • Available Online: 2022-08-10
  • Publish Date: 2022-05-30
    Abstract
  • Water based drilling fluids have been used to drill deep tight gas wells in Daqing Oilfield. In the treatment of the waste drilling fluids, it was found that the solids and the liquids were difficult to be separated from each other, the mud cakes had water-cut of greater than 80%, and secondary contamination existed in future operations. A study on the bio-safety disposal of waste water based drilling fluids was conducted to solve these problems. Based on the analyses of the characteristics of and difficulties in the treatment of the water drilling fluids, the Box-Behnken Central Composite Experiment and Response Surface Method were chosen as a means of study. By exploring the effects of the optimum ratio of gel breaker, coagulant aid and flocculant on the solid-liquid separation efficiency of the waste water based drilling fluids, a new mathematical model was established describing the relationship between the water-cut of mud cakes for solids-liquid separation and the treatment recipe parameters. A method for the biosafety disposal of waste water based drilling fluids was developed, with destabilization and flocculation as the core technique. Using the mathematical model and the biosafety disposal method, a destabilization-flocculation-solid-liquid separation technique was established. Field test results have shown that a waste water based drilling fluid, after treatment with the technique, formed a mud cake with water-cut of 47%, the suspension content in the mud cake leachate was 63 mg/L. Nine major pollution indices such as COD etc. of the waste drilling fluid conform to the requirements of the national standard GB 8978—1998 and the local standard DB23/T 693—2000, namely, “Waste Drilling Fluid Treatment Specification of Heilongjiang Province”. This technology provides an effective solution to the poor gel breaking and destabilization efficiency of the water based drilling fluids for deep hole drilling in Daqing Oilfield and has good promotion and application values.

     

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