Optimizing Technology of Drilling Fluid for Improving Logging Success Rate of Central Area of Junggar Basin
Abstract
The characters of deep wells in the central area of Junggar Basin include the burial depth of the reservoir is deep, the temperature of borehole bottom is high and the middle and the lower formations are developed with hard and brittle mudstones. The Toutunhe Formation and the Badaowan Formation are full of micro fissures which frequently caused sloughing, borehole wall collapse to happen. The average well diameter expansion rate exceeds 15% and logging instruments got blocked frequently. Based on the analyses of mineral composition and physical and chemical properties, Optimized drilling fluid formula was presented after evaluation of different size plugging agents and lubricants in order to heighten tight plugging performance. The result of Pressure Transmission experiment indicates that after optimization drilling fluid can prevent or stay the pressure transmission in mudstone effectively. The formula has been applied in Well Cheng 6 and the high-temperature and high-pressure filtration loss was only 8.0mL, the average well diameter expansion rate was less than 5%. The logging success rate reached 100%, exceeding the research target of 80%. Using this formula, the goals of stabilizing borehole wall and enhancing logging success rate have been achieved.
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DOI: http://dx.doi.org/10.3968/12557
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