Study on Solids Distribution and Control in Water Based Drilling Fluids-Take Gas Wells in Western Sulige as Example
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摘要: 为促进钻井现场水基钻井液的精细化控制程度、进一步提升安全高效钻井技术。以苏里格东部两口气井钻探现场的水基钻井液为研究对象，对其在钻进过程中的固相含量变化、固相粒径分布、钻井液含砂量以及固控设备的清除效率等开展了分析研究。结果表明，从延长组至马家沟组的钻进过程中，钻井液固相含量从4%～7%增长至9%～13%，伴随着钻井液密度的上升；粒径大于109 μm（140目）的固相从63.05%降至35.5%，粒径小于74 μm的固相从3.98%增长至12.73%，且固控设备难以降低其含量；钻井液含砂量控制在0.5%以内；在钻井液体系转化前后，沉砂罐和振动筛清除固相效率最高分别为43.31%～51.47%和45.38%～53.98%，而除砂除泥一体机的清除效率最低为5.31%～11.76%。这为钻井现场的高效固相控制与水基钻井液的精细优化提供了参考与借鉴。Abstract: This paper discusses the studies on factors affecting solids control of a drilling fluid, such as changes in the solids content of the drilling fluid during drilling, particle size distribution of the drilling fluid, sand content of the drilling fluid as well as the efficiency of the solids control equipment, taking the water based drilling fluids from two gas wells drilled in the eastern Sulige area as examples. The purpose of the studies is to push forward the precise control of field drilling fluids and hence further improve the safe and efficient drilling operation. The results of the studies show that during drilling from the Yanchang formation down to the Majiagou formation, the solids content of the drilling fluid increased from 4%-7% to 9%-13%, accompanied with an increase in mud density. The content of the solids with particle sizes ＞ 109 μm (140 mesh) decreased from 63.05% to 35.5%, the content of the solids with particle sizes ＜ 74 μm increased from 3.98% to 12.73%, and the solids content cannot be reduced to a lower level anymore. The sand content of the drilling fluid was controlled at less than 0.5%. Before and after mud system conversion, the highest efficiencies of solids removal of the sand trap and the shale shakers are reached, which are 43.31%-51.47% and 45.38%-53.98%, respectively. At the same time, the solids removal efficiency of the mud cleaner (desander and desilter) is at the lowest level, which is 5.31%-11.76%. These studies can be used as a reference to the efficient solids control and precise optimization of water based drilling fluids in field operation.
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Key words:
- Water based drilling fluid /
- Solids control /
- Solids distribution
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