松辽盆地北部深层天然气勘探钻井技术  

Drilling Technology for Deep-layer Natural Gas Exploration in Northern Part of Songliao Basin

作　　者：孔凡军[1] 周英操[2] 张书瑞[3] 周兆明[4] 杨峰平[1] 翟洪军[2] 刘永贵[2] 韩福彬[1] 

机构地区：[1]大庆油田有限责任公司勘探分公司 [2]大庆石油管理局钻井工艺研究院 [3]大庆石油管理局钻井一公司 [4]大庆石油管理局钻井技术服务公司,黑龙江省大庆市163453

出　　处：《中国石油勘探》2004年第4期38-42,60,共6页China Petroleum Exploration

摘　　要：松辽盆地北部深层天然气勘探的主要储层营城组火山岩为裂缝和孔隙双重储集介质,富含凝灰质或为凝灰岩储层,常规钻井施工中,储层污染严重;井底压差高,井径不规则,影响录井和测井对气层的发现和评价,这些问题直接影响到对天然气的发现和探明。近几年来,根据常规钻井中存在的问题,开展了井身结构优化、与地层流体性质和储层压力系数相匹配的低密度钻井液体系研究与应用、欠平衡井底负压值控制技术研究、欠平衡钻井参数自动采集及分析系统的开发、欠平衡随钻井底压力和温度测量工具的研究、地层压力求取与压井液密度确定技术等7 项工作,形成了配套的近平衡、欠平衡钻井完井工艺技术。通过在松北深层徐深1 井等3 口井应用近平衡钻井技术,卫深5 井等8 口井应用欠平衡钻井技术,钻井过程流钻点火,及时发现和有效保护气层,压裂后试气获得高产商业气流,取得了非常好的勘探效果,为松辽盆地北部深层徐家围子地区天然气勘探展现1000×108m3 储量规模起到了关键作用。The main reservoir for deep-layer natural gas exploration in the northern part of Songliao Basin is mainly volcanic rock ofYingcheng Formation, which is the reservoir medium with seams and pores containing tuff. Conventional drilling operation causes serious pollution of the reservoir. The high pressure differential at the well bottom and irregular borehole diameter affect discovery and appraisal of the gas layers through well-log and logging. Those issues directly impair natural gas discovery and con?rmation. To solve the issues existing in the conventional drilling operation, seven items of research work have been completed in the recent years, such as study of wellbore structural optimization, application of low-density drilling ?uid suitable for formation ?uid properties and reservoir pressure coef?cients, negative pressure value controlling technology at under-balance well bottom, development of the automatic parameters acquisition and analysis system for under-balance drilling, measurement tools for under-balance MWD for well bottom pressure and temperature, acquisition of formation pressure and determination of killing ?uid density. A series of process technology has been developed for near-balance and under-balance drilling and completion. The near-balance drilling technology is used in drilling three wells including the deep Xushen-1 in the northern part of Songliao Basin while under-balance drilling technology is used in drilling the other eight wells in the area, such as Weishen-5. The high-yield commercial gas ?ow is obtained from those wells with the gas formations effectively protected. Those desirable exploration results have played a key role in discovery of the 1000×108m3 reserves of the deep- layer natural gas in Xujiaweizi region in the northern part of Songliao Basin.

关 键 词：欠平衡钻井 近平衡钻井 完井 钻井液 储层保护 负压值 井底压力 松辽盆地北部 

分 类 号：TE242[石油与天然气工程—油气井工程] P618.13[天文地球—矿床学]