基于录井数据计算地层漏失压力的方法  

Method of calculating formation leakage pressure based on mud logging data

作　　者：方俊伟 杨涪杰[3] 贾晓斌 邓明毅 FANG Junwei;YANG Fujie;JIA Xiaobin;DENG Mingyi(Sinopec Research Institute of Petroleum Engineering of Northwest Oilfield Company,Urumqi,Xinjiang 830011,China;Sinopec Key Laboratory for EOR of Fractured-Vuggy Reservoirs,Urumqi,Xinjiang 830011,China;Southwest Petroleum University,610500,China)

机构地区：[1]中石化西北油田分公司石油工程技术研究院 [2]中国石化缝洞型油藏提高采收率重点实验室 [3]西南石油大学

出　　处：《录井工程》2020年第1期7-11,共5页Mud Logging Engineering

基　　金：中国石油化工股份有限公司重大科技项目群“顺北油气田一区优快钻井技术研究”(编号:P18021-2)。

摘　　要：钻进过程中突发井漏会导致大量钻井液漏失,严重的会影响正常钻进周期甚至使整口井报废,因而提前确定易漏失层位的漏失压力并进行相应的钻井液密度设计是高效防漏堵漏作业的前提,同时也是同一区块其他井地质工程设计的重要依据。为此,研发了一种基于录井数据计算地层漏失压力的方法。首先构建一套判别模型,通过实钻录井数据对钻遇的致漏裂缝类型进行识别,然后基于统计法,结合现场收集的目标井的井漏数据,构建漏失压差与漏失流量的相关性,最后拟合求取地层漏失压力。现场应用表明,该方法可以有效地指导相关堵漏作业与钻井液密度设计,实例校验证明,应用该模型计算漏失压力优于传统的统计法。Sudden lost circulation during drilling will cause vast loss of drilling fluid,which will seriously affect the normal drilling cycle and even make the whole well scrapped.Therefore,to determine the leakage pressure of lost-circulation zones,and to design the corresponding drilling fluid density in advance are preconditions for high efficient preventing and treating lost circulation,and they are also important bases for the geological engineering design of other wells in the same block.To this end,a method for calculating formation leakage pressure based on mud logging data has been developed.First,a set of discriminant models are constructed,and the types of fractures causing leakage during drilling are identified by mud logging data of actual drilling.Then,based on the statistical method and combined with the lost circulation data of the target well collected on site,the correlation between leakage pressure difference and leakoff flow rate is constructed.Finally,the formation leakage pressure is obtained by fitting.Field application shows that this method can effectively guide related dental work and drilling fluid density design.The verification of examples proved that application of this model to calculate the leakage pressure is superior to the traditional statistical method.

关 键 词：录井数据 裂缝性地层 砂泥岩混层 漏失压力 统计法 

分 类 号：TE132.1[石油与天然气工程—油气勘探]