东胜气田致密砂岩气藏钻井储层保护技术研究及应用
投稿时间:2021-11-15  修订日期:2022-04-30  点此下载全文
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作者单位邮编
冯永超 中国石油化工股份有限公司华北油气分公司 450000
基金项目:国家重大专项“鄂尔多斯盆地北缘低丰度致密低渗气藏开发关键技术”(编号2016ZX05048-002)
中文摘要: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。
中文关键词:致密砂岩储层  侵入深度  伤害机理  储层保护  自然建产  东胜气田
 
Research and application of drilling reservoir protection in tight sandstone gas reservoir of Dongsheng Gas Field
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 instability and reservoir damage in the drilling process, and the reservoir damage caused by the combination of various factors hinders the release of gas productivity. Build capacity in order to further improve the reservoir nature, and increase the single well production, on the basis of reservoir permeability recovery rate, through the reservoir damage factors analysis, the introduction of drilling fluid invasion depth quantitative evaluation method, deepen the reservoir damage mechanism, has been clear about the low density, low water loss and soilless phase and strong sealing fluid countermeasure, Waterproof locking agent and tight pressure compound temporary plugging agent were optimized in the laboratory, and soilless compound temporary plugging high acid soluble drilling fluid was formed. Reservoir permeability recovery rate was increased to 91.11%, mud invasion depth was reduced by 46.28%, and the formed drilling fluid was promoted and applied in Jin66 well area, the average single well production was increased by 11%, and 3 Wells were realized natural production. Further study on the effect of efficient exploration and development of tight sandstone reservoirs in Dongsheng Gas Field.
keywords:intrusion depth  injury mechanism  reservoir protection  natural built to produce  Dongsheng gas field
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