摘要
水基钻井液与地层相互作用易引起测井数据失真,导致据此计算出的坍塌压力不能反映地层真实情况。为此,提出了声波时差测井资料的校正方法,并针对乌石YQ油田开展了单井原状坍塌压力计算及井壁失稳分析。室内试验结果显示,钻井液会造成岩石理化性质发生改变,其中声波时差加大尤为明显。通过校正得到原状地层声波时差,进一步获得未受钻井液影响的原状地层坍塌压力。同时,WZ2段地层因水化能力强而致整体坍塌压力增大,LS2段、LS3段泥页岩微裂缝发育,坍塌压力增幅与泥质含量成正相关。建议在WZ2段地层加强水化抑制性,在LS2段、LS3段地层加强水化抑制性及封堵性能。
In view of the interaction of water based drilling fluid and formation can cause the well logging data distortion,the collapse pressure cannot reflect the real situation,the correction method of acoustic logging data is put forward,and the calculation of collapse pressure and the analysis of borehole instability are carried out in Wushi YQ Qilfield.Laboratory tests show that the drilling fluid can change the physical and chemical properties of rocks,especially the increase of acoustic wave.The acoustic wave in the undisturbed formation of the whole well can be obtained by correction,and the collapse pressure of undisturbed formation without the effect of the drilling fluid can be further obtained.The collapse pressure of WZ2 group increase wholly due to its strong hydration capacity,micro-cracks develop in the shale of LS2 group and LS3 group,the increasing range of collapse pressure is positively correlated with mud content.The measures to optimize the performance of drilling fluid is proposed,the hydration inhibition should be strengthened in the WZ2 group,not only the sealing performance but also the hydration inhibition should be strengthened in the LS2 group and LS3 group.
作者
黄静
刘贤玉
王成龙
曹峰
李文拓
HUANG Jing;LIU Xianyu;WANG Chenglong;CAO Feng;LI Wentuo(Zhanjiang Branch of CNOOC,Zhanjiang Guangdong 524057,China)
出处
《重庆科技学院学报（自然科学版）》
CAS
2021年第4期60-63,120,共5页
Journal of Chongqing University of Science and Technology：Natural Sciences Edition
基金
“十三五”国家科技重大专项“南海西部海域低渗油藏勘探开发关键技术”(2016ZX05024-006)。
关键词
水基钻井液
乌石YQ油田
坍塌压力
声波时差校正
井壁稳定
water based drilling fluid
Wushi YQ Oilfield
collapse pressure
correction of acoustic
borehole stability
作者简介
黄静(1989-),女,硕士,工程师,研究方向为海上钻井。
