地层压力监测方法改进及在钻井中的应用  

Improvement of Formation Pressure Monitoring Method and Its Application in Drilling

作　　者：杨天方 薛晓军 付联名 YANG Tianfang;XUE Xiaojun;FU Lianming(China University of Petroleum-Beijing at Karamary,Karamary,Xinjiang 834000,China;Geological Research Institute,CNPC Xibu Drilling Engineering Co.,Ltd.,Karamary,Xinjiang 834000,China;PetroChina Xinjiang Oilfield Company,Karamary,Xinjiang 834000,China)

机构地区：[1]中国石油大学(北京)克拉玛依校区 [2]中国石油西部钻探地质研究院 [3]中国石油新疆油田分公司

出　　处：《钻采工艺》2021年第2期1-4,共4页Drilling & Production Technology

基　　金：新疆维吾尔自治区高校科研项目“准噶尔盆地玛湖凹陷二叠系地层孔隙压力评价研究”(编号:XQZX20190030);校区引进人才项目“新疆玛湖凹陷地层流体解释与评价图版符合率研究”(编号:XQZX20180027)。

摘　　要：在准噶尔盆地的勘探开发过程中,钻进中的地层压力精确监测对于安全施工至关重要。文章利用伊顿方法,分析随钻测井参数与地层压力监测关系,改进了以欠压实为高压成因的dc指数法地层压力监测方法。通过对密度测井数据的回归分析,建立了声速与有效应力的关系及对上覆岩层压力的外推演算模型。在此基础上,分析了井筒压差、钻井液密度、钻头磨损等因素对地层压力监测的影响。现场应用结果表明,与传统计算地层压力结果比较,经过钻头磨损、压差修正后,并利用上覆岩层的外推模型方法的计算结果精确度较高,并且声波时速与地层压力计算模型精度较前方法进一步提高。文章中准确的地层压力监测方法为解决现场复杂压力系统的监测及钻井工程安全问题提供一定理论意义上的指导。There are many error sources which lead to borehole trajectory measurement error and it is difficult to correct.In order to improve the measurement accuracy of borehole trajectory,it is necessary to identify the main error sources.In this paper,the relationship between LWD parameters and formation pressure monitoring is analyzed by using Eaton method,and the DC index method of formation pressure monitoring is improved.On this basis,the influence of wellbore pressure difference,drilling fluid density and bit wear on formation pressure monitoring is analyzed.Through regression analysis of density logging data,the relationship between sound velocity and effective stress and the extrapolation calculation model of overlying strata pressure are established.The field application results show that,compared with the traditional calculation results of formation pressure,the accuracy of the calculation results by using the extrapolation model of overlying strata after bit wear and pressure difference correction is higher,and the accuracy of the calculation model of acoustic velocity and formation pressure is further improved than that of the former method.The accurate formation pressure monitoring method in this paper provides theoretical guidance for solving the monitoring of complex pressure system and drilling engineering safety problems.

关 键 词：地层压力 DC指数 上覆岩层压力 声波速度 

分 类 号：TE151[石油与天然气工程—油气勘探] TE24