期刊
JOURNAL OF NATURAL GAS SCIENCE AND ENGINEERING
卷 70, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jngse.2019.102964
关键词
Drilling fluid testing procedure; Suspending properties; Hole cleaning; Water based drilling fluid; Sepiolite clay; High temperature high pressure
资金
- European Union's Horizon 2020 - Research and Innovation Framework Programme [641202]
- ThermoDrill consortium
- H2020 Societal Challenges Programme [641202] Funding Source: H2020 Societal Challenges Programme
Drilling fluids with a high carrying capacity can improve the rate of penetration only if they maintain their suspending properties under downhole conditions. Testing, however, is generally performed by hot rolling fluids at the expected temperatures and measuring rheology after cooling which can produce misleading results. Therefore, a new test protocol was developed using a sepiolite water-based fluid and a xanthan gum-based reference system designed for drilling high temperature wells. First the static carrying capacity of the fluids was evaluated by suspending simulated cuttings and aging them statically before evaluating the samples visually. With conventional testing, both fluids seemed to retain their suspending capability after aging equally, however, only the sepiolite fluid maintained its excellent suspending property up to 150 degrees C (302 degrees F) in the static carrying capacity tests. This was confirmed by HTHP (150 degrees C/302 degrees F) viscosity measurements thus showing the importance of testing under actual conditions.
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