Reservoir protection in drilling through the tight sandstone gas reservoir of Dongsheng Gas Field
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摘要: 东胜气田上古生界下石盒子组为致密砂岩储层，部分区域储层物性好，具备不压裂自然建产潜能，钻井过程中存在井壁失稳及储层损害问题，各因素叠合造成的储层伤害阻碍了气层的产能释放。为进一步提升储层自然建产能力和增加单井产量，在储层渗透率恢复率的基础上，通过储层伤害影响因素分析，引入钻井液侵入深度定量化评价方法，深化了储层伤害机理认识，明确了低密度、无土相、低失水和强封堵的钻井液对策，室内优选了防水锁剂和致密承压复合暂堵剂，优化形成了无土相复合暂堵高酸溶钻井液，储层渗透率恢复率提高至91.11%，泥浆侵入深度降低46.28%。形成的钻井液在锦66井区推广应用，平均单井产量提升11%，并实现3口井自然建产，进一步提高东胜气田致密砂岩储层高效勘探开发的效果。Abstract: The Lower Shihezi Formation of Upper Paleozoic in Dongsheng Gas Field is a tight sandstone reservoir with good physical properties in some areas and natural production potential. There are problems of borehole wall failure and reservoir damage in the drilling process， and the reservoir damage caused by the combination of various factors hinders the release of gas productivity. In order to improve the natural production capacity of the reservoir， and increase the single well production， on the basis of reservoir permeability recovery， through analysis of the reservoir damage factors， the drilling fluid intrusion depth quantitative evaluation method was introduced to learn better the reservoir damage mechanism， and identify the low density， low water loss and soil-free phase and strong sealing drilling fluid as the solution. The waterproof locking agent and the tight pressure compound temporary plugging agent were selected in the laboratory to form a soil-free compound temporary plugging high acid soluble drilling fluid， increasing the permeability recovery to 91.11%， and reducing the mud intrusion depth by 46.28%. The drilling fluid was applied in the Jin-66 well area with the average single well production increased by 11%， and 3 wells realizing natural production； which has improved the effect of efficient exploration and development of tight sandstone reservoirs in Dongsheng Gas Field.
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