Optimization and application of low viscosity and high cutting white oil base drilling fluid
The problems of low yield point(YP),electrical stability(ES)values and high temperature and high pressure(HTHP)filtration will usually occur in supplying service of ordinary white oil base drilling flu-id,thus it is incapable to meet the need to conduct smooth drilling in slim shale gas wells in Sichuan and Chongqing provinces.To address the complicated issues,with laboratory comparison and optimization experi-ments,optimum emulsifiers were selected to enhance ES value of 1 180 V.Optimized addition of seepage plug-ging agents were utilized to decrease the HTHP filtration,the experiment result was 2.4 mL.Rheological modi-fiers was added in the mud system to boost the YP and the ratio of YP to PV,the experiment result of the ratio of YP to PV was 0.25 Pa/(mPa·s).The formulation of low viscosity and high cutting white oil base drilling flu-id was completed,and then mud properties were evaluated.Results showed that the system had high tolerance of salt and drilling cuttings,good cutting-carrying capacity and HTHP rheological properties.This system had been applied in slim shale gas wells since 2022,it exhibited excellent properties to satisfy the demand of drill-ing in slim shale gas wells.In addition,it was easy to condition and keep favourable rheological properties in high density oil base mud.The low viscosity and high cutting white oil base drilling fluid supplies strong techni-cal support for the slim shale gas wells in Sichuan and Chongqing provinces.
white oil base drilling fluidlow viscosity and high cuttingrheologyproperties of drilling fluid
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