CAJ | 학술논문

在塔北哈拉哈塘区块固井作业中,由于二开裸眼段长,揭开产层后地层压力系数低,存在裂缝型、溶洞型碳酸盐岩地层,采取常规密度水泥浆固井,极易诱发井漏,导致固井失败。通过分析该区块地质特点,根据水泥浆体的颗粒级配理论,优化工艺,采用低密度高强度水泥浆封固了长裸眼段。18口探井二开长裸眼段水泥浆返高全部合格,缩短了钻井周期,提高了固井质量。
재탑북합랍합당구괴고정작업중,유우이개라안단장,게개산층후지층압력계수저,존재렬봉형、용동형탄산염암지층,채취상규밀도수니장고정,겁역유발정루,도치고정실패。통과분석해구괴지질특점,근거수니장체적과립급배이론,우화공예,채용저밀도고강도수니장봉고료장라안단。18구탐정이개장라안단수니장반고전부합격,축단료찬정주기,제고료고정질량。
Because of the long uncased hole,low pressure factor formation and fractured or caved carbonate rock,lost circulation is easy to occur if conventional cement slurry with density of 1.90g/cm3 is used,or even lead to failure in cementing of HaRa HaTang region.According to the analysis of the geological characteristics,on the basis of optimizing the particle distribution of cement,microsphere and microsilicate as well as cementing process,the purpose of cementing long uncased hole with low density slurry is achieved.During the year of 2009 and 2010,in Hara Hatang area,eighteen exploratory wells＇ cementing length in annulus are all qualified,and low density cementing quality is interpreted as fine more than eighty percent by logging.We have used this method and have proved its reliability,which makes the drilling cycle shorter and cementing quality better.