1
Ohmer Herve: Apparatus for establishing branch wells from a parent well. Anadrill Int, Schlumberger Services Petrol, February 11, 1998: EP0823534-A1 (130 worldwide citation)

A method and apparatus for creating multiple branch wells from a parent well is disclosed. According to a first embodiment of the invention a multiple branching sub is provided for placement at a branching node of a well. Such sub includes a branching chamber (32) and a plurality of branching outlet ...


2
Drochon Bruno, Kefi Slaheddine: Very low-density cement slurry. Schlumberger Technology, Schlumberger Services Petrol, Schlumberger Holdings, September 4, 2002: EP1236701-A1 (97 worldwide citation)

A cement slurry having a density between 750 kg/m and 1,000 kg/m, comprising a solid fraction comprising: either 75% - 90% (by volume) of lightweight particles having a mean particle size between 10 and 60 mu m; 10% - 25% (by volume) of Portland cement having a mean particle size of between 10 and 5 ...


3
Hart Barrie, Johnson Craig D, Schetky L Mcd: Bi-stable expandable device and method for expanding such a device. Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, July 17, 2002: EP1223305-A2 (64 worldwide citation)

An expandable device comprising a plurality of expandable cells (23). The cells may be bistable cells or other types of cells that are expanded from a contracted position towards an expanded position. Additionally, the cells may be combined with locking mechanisms to hold the structure in an expande ...


4
Babour Kamal, Rossi David, Chouzenoux Christian: Power and signal transmission using insulated conduit for permanent downhole installations. Schlumberger Technology, Schlumberger Services Petrol, Schlumberger Holdings, December 15, 1999: EP0964134-A2 (53 worldwide citation)

An apparatus and method is presented for establishing electrical connection to permanent downhole oilfield installations (26,27,28) using an electrically insulated conducting casing (22). Current is caused to flow in the casing by a source on the surface connected to the casing (22). One or more per ...


5
Kleinberg Robert L, Sezginer Abdurrahman: Pulsed nuclear magnetism tool for formation evaluation while drilling.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, February 2, 1994: EP0581666-A2 (51 worldwide citation)

The instruments of a pulsed nuclear magnetic resonance (NMR) device are included in a drill collar for evaluating earth formations. The resulting tool makes NMR measurements while the formation is being drilled.


6
Drochon Bruno: Spacer fluid additive. Prad Res & Dev, Schlumberger Holdings, Schlumberger Technology, Schlumberger Services Petrol, July 1, 2009: EP2075303-A1 (38 worldwide citation)

A spacer fluid comprising a fluid and a viscosity agent wherein the viscosity agent is a mixture of polyvinylalcohols having at least two polyvinylalcohols with different degrees of hydrolysis such that the rheology of the spacer fluid is stable during temperatures changes.


7
Lerner Daniel, Masak Peter: Measurement while drilling tool.. Anadrill Int, Schlumberger Services Petrol, November 8, 1995: EP0681090-A2 (37 worldwide citation)

An integrated modulator and turbine-generator includes a turbine impeller which is directly coupled by a drive shaft to a modulator rotor downstream from the impeller. The modulator rotor is further coupled by a drive shaft and a gear train to a three phase alternator downstream of the modulator rot ...


8
Sheiretov Todor K, Post Roger A, Roy Carl J, Cordera F Joseph: Constant force actuator. Schlumberger Services Petrol, Schlumberger Holdings, Schlumberger Technology, September 17, 2003: EP1344893-A2 (34 worldwide citation)

The invention provides a substantially constant force actuator that is applicable to centralizers, anchors and tractors for use in wells and is applicable to lifting devices such as jacks and load supporting devices. One or more sets of linkage arms are angularly movable by the force of one or more ...


9
Rosthal Richard A: Method and apparatus for determining horizontal conductivity and vertical conductivity of earth formations.. Schlumberger, Schlumberger Services Petrol, Schlumberger Technology, Schlumberger Holdings, February 10, 1993: EP0527089-A2 (34 worldwide citation)

The disclosed technique and apparatus utilizes the different characteristic responses of a plurality of signals from a propagation or induction well logging device to determine the vertical and horizontal resistivity of formations surrounding a borehole. In a disclosed embodiment, a method is set fo ...


10
Wu Peter T: Apparatus and method for determining properties of anisotropic earth formations. Anadrill Int, Schlumberger Services Petrol, December 29, 1997: EP0814349-A2 (32 worldwide citation)

A method is disclosed for determining the horizontal resistivity, vertical resistivity, and dip of formations surrounding a bore-hole, comprising the following steps:(a) suspending a logging device in the borehole; (b) transmitting electromagnetic energy from a transmitter location on the logging de ...