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1. 发明申请

WO2003023453A1 A METHOD AND APPARATUS FOR DETERMINING THE RESISTIVITY OF A FORMATION SURROUNDING A CASED WELL 审中-公开
标题翻译：用于确定环境形成环境的电阻率的方法和装置
公开(公告)号：WO2003023453A1
公开(公告)日：2003-03-20
申请号：PCT/EP2002/008877
申请日：2002-08-08
申请人： SERVICES PETROLIERS SCHLUMBERGER , SCHLUMBERGER TECHNOLOGY B.V. , SCHLUMBERGER HOLDINGS LIMITED , SCHLUMBERGER CANADA LIMITED , PETROLEUM RESEARCH & DEVELOPMENT N.V. , SCHLUMBERGER OVERSEAS S.A. , SCHLUMBERGER OILFIELD ASSISTANCE LIMITED , SCHLUMBERGER SURENCO S.A. , SCHLUMBERGER SERVICES LIMITED , BENIMELI, Dominique
发明人： BENIMELI, Dominique
IPC分类号： G01V3/24
CPC分类号： G01V3/24
摘要： Apparatus for measuring the resistivity of a formation surrounding a borehole having a conductive casing comprises a tool body; first and second current injectors spaced apart on the tool body for injecting current into the casing; and an insulating body portion disposed between the current injectors, at least three ring electrodes being mounted on the insulating body portion between the current injectors. A method of determining the resistivity of a geological formation surrounding a borehole having a conductive casing comprises positioning the tool in the borehole, applying an electric current to the casing from at least one of the current injectors such that current leaks into the formation from the casing at the level of the ring electrodes; shunting the current by a feedback circuit connected to a first pair of the ring electrodes and measuring the voltage drop due to current leaking in to the formation across a second pair of the ring electrodes, the feedback circuit being configured such that the current flowing along the casing at the level of the first pair of ring electrodes is small compared with the shunt current; determining the leakage current into the formation from the voltage drop measured across the second pair of electrodes; and determining the resistivity of the formation from the leakage current.
摘要翻译：用于测量围绕具有导电壳体的钻孔的地层的电阻率的装置包括工具主体; 在工具主体上间隔开的第一和第二电流注入器，用于将电流注入到壳体中; 以及设置在电流注入器之间的绝缘体部分，至少三个环形电极安装在电流注入器之间的绝缘体部分上。确定具有导电壳体的井眼周围的地质层的电阻率的方法包括将工具定位在钻孔中，从电流注入器中的至少一个向外壳施加电流，使得电流从壳体泄漏到地层中在环形电极的水平; 通过连接到第一对环形电极的反馈电路对电流进行分流，并且测量由于电流泄漏到跨越第二对环形电极的形成的电压的电压降，反馈电路被配置为使得沿着第一对环形电极的电平与分流电流相比较小; 从跨越第二对电极测量的电压降确定进入地层的漏电流; 并从泄漏电流确定地层的电阻率。

2. 发明申请

WO2004029663A1 DEVICE AND PROCESS FOR DETERMINATION OF THE RESISTIVITY OF A FORMATION SURROUNDING A CASED BOREHOLE 审中-公开
标题翻译：确定围岩形成电阻率的装置和方法
公开(公告)号：WO2004029663A1
公开(公告)日：2004-04-08
申请号：PCT/EP2003/010353
申请日：2003-09-17
申请人： SERVICES PETROLIERS SCHLUMBERGER , SCHLUMBERGER TECHNOLOGY B.V. , SCHLUMBERGER HOLDINGS LIMITED , SCHLUMBERGER CANADA LIMITED , PETROLEUM RESEARCH & DEVELOPMENT N.V. , SCHLUMBERGER OVERSEAS S.A. , SCHLUMBERGER OILFIELD ASSISTANCE LIMITED , SCHLUMBERGER SURENCO S.A. , SCHLUMBERGER SERVICES LIMITED , SCHLUMBERGER SEACO INC. , BENIMELI, Dominique , LEVESQUE, Cyrille , MCKEON, Donald
发明人： BENIMELI, Dominique , LEVESQUE, Cyrille , MCKEON, Donald
IPC分类号： G01V3/20
CPC分类号： G01V3/20
摘要： Body (22) for measuring the resistivity of a formation (9) surrounding a well (10) equipped with a lining (11), comprising: a body (23) of a probe (22), a set of three primary voltage measurement electrodes (ea, eb, ec), an upper electrode (ea) and a lower electrode (ec) and a central electrode (eb), two electrodes (Inl, In2), an upper current injection electrode (Inl) and a lower current injection electrode (In2) arranged on each side of the set of primary electrodes, characterized in that it also comprises, two secondary voltage measurement electrodes (24, 26) arranged on each side of the set of primary electrodes (ea, eb, ec), and between the two current injection electrodes (Inl, In2), the spacing between a secondary electrode (24, 26) and the closest primary end electrode (ea, ec) being more than 1.5 times the spacing between the primary electrodes (ea, eb, ec).
摘要翻译：用于测量围绕装备有衬里（11）的井（10）的地层（9）的电阻率的主体（22），包括：探针（22）的主体（23），一组三个一次电压测量电极（ea，eb，ec），上电极（ea）和下电极（ec）和中心电极（eb），两个电极（In1，In2），上电流注入电极（Inl）电极（In2），其布置在所述一组初级电极的每一侧上，其特征在于，还包括布置在所述初级电极组（ea，eb，ec）的每一侧上的两个二次电压测量电极（24,26）并且在两个电流注入电极（In1，In2）之间，次级电极（24,26）和最接近的主端电极（ea，ec）之间的间距大于主电极（ea，eb）之间的间距的1.5倍，ec）。

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