Volume 36 Issue 5
Oct.  2019
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WANG Jianhua, ZHANG Jiaqi, XIE Sheng, YAN Lili. Evaluation and Improvement of the Performance of Oil Base Drilling Fluids for Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 555-559. doi: 10.3969/j.issn.1001-5620.2019.05.005
Citation: WANG Jianhua, ZHANG Jiaqi, XIE Sheng, YAN Lili. Evaluation and Improvement of the Performance of Oil Base Drilling Fluids for Shale Gas Drilling[J]. DRILLING FLUID & COMPLETION FLUID, 2019, 36(5): 555-559. doi: 10.3969/j.issn.1001-5620.2019.05.005
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Evaluation and Improvement of the Performance of Oil Base Drilling Fluids for Shale Gas Drilling

doi: 10.3969/j.issn.1001-5620.2019.05.005

  • 1. CNPC Engineering Technology R&D Company Limited, Beijing 102206;

  • 2. PetroChina Southwest Oil & Gas feld Company Exploration Division, Chengdu, Sichuan 610041

  • Received Date: 2019-05-26
  • Publish Date: 2019-10-30
    Abstract
  • As one of the key technologies in drilling horizontal shale gas wells, oil base drilling fluids are used to maintain the stability of borehole wall and to clean the hole. In this paper the rheology, plugging capacity, solids content and property stability etc. of the oil base drilling fluids used in PetroChina's Chuanyu development area are evaluated. From the evaluation and analyses of downhole troubles encountered in Chuanyu area it is concluded that plugging capacity of an oil base drilling fluid is the key in maintaining the stability of borehole wall. By increasing the φ6 reading and flow rate of the drilling fluids, hole cleaning can be improved. Deterioration of the performance of a drilling fluid comes mainly from the increase of low-density solids content in the drilling fluid. To resolve problems encountered in maintaining borehole wall instability, hole cleaning and mud property maintenance, a method has been established to evaluate the plugging capacity of nanometer and micrometer particles. A method of calculating the content of harmful low-density solids in a drilling fluid is determined, and a set of technical norms for maintaining the properties of oil base drilling fluids for shale gas development is formed, hopefully will provide a technical support to shale gas development with horizontal drilling.

     

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