Schlumberger Technology Corporation

Prad Research and Development Nv

Services Petroliers Schlumberger

Schlumberger Holdings Limited

Peter Fitzgerald

Sebastien Ives

Joseph P Varkey

Simon James

Joseph Ayoub

Stuart I Jardine

Hifzi Ardic

Torbjørn Tellnes

An assembly for monitoring load on a drum during an operation in a well with a well access line deployed from the drum that includes multiple line detection mechanisms for acquiring real-time information relative to dynamic characteristics of the lone over the course of the operation. A processor is in communication with the multiple line detection mechanisms and configured to compute the real-time information in light of pre-stored information relative to physical characteristics of the line and the drum. As a result, real-time monitoring of a load on the drum may be achieved. Thus, the operation may be adjusted in real-time as necessary to avoid over-loading of the drum. Additionally, a drum load history may be recorded so as to better account for the true condition of the drum following successive operations.

Drum load monitoring

An assembly for monitoring load on a drum during an operation in a well with a well access line deployed from the drum. The assembly may include multiple line detection mechanisms for acquiring real-time information relative to dynamic characteristics of the lone over the course of the operation. The assembly also includes a processor for computing the real-time information in light of pre-stored information relative to physical characteristics of the line and the drum. As a result, real-time monitoring of a load on the drum may be achieved. Thus, the operation may be adjusted in real-time as necessary to avoid over-loading of the drum. Additionally, a drum load history may be recorded so as to better account for the true condition of the drum following successive operations.

Production logging apparatus and method are provided. The apparatus comprises a coupling module, an electronic module, a micro-winch, a docking station, and a micro-production logging tool. The coupling module provides mechanical support for the production logging apparatus below a pumping arrangement disposed in a wellbore, and allows flow to enter the pumping arrangement. The electronic module comprises a winch controller, a powering module and a telemetry module, and adapted to automate the micro-winch. The docking station comprises a latching mechanism for ensuring positive engagement of a micro-production logging tool with the production logging apparatus during docking. And the micro-production logging tool comprises at least one sensor and is coupled to the micro-winch by a cable for regular production logging runs to measure the evolution of well characteristics.

Logging while producing apparatus and method

A method for determining the size of tubular pipe to be inserted into an interval of cased or uncased borehole is disclosed. The position of the borehole wall or innermost casing surface in the interval is determined and a window length that is less than the length of the interval is defined. A series of windows along the interval is defined and for each window, the determined position of the borehole wall in that window is used to define a polygon, the edges of which are defined by the parts of the borehole wall closest to the borehole axis in that window. The maximum size of pipe diameter that will fit inside the polygon in each window without intersecting the edges is determined and the size of pipe to be inserted into the interval selected based on the maximum size of diameter pipe determined for each window.

Method for determining the size of tubular pipe to be inserted in a borehole

An assembly for positioning a well access line in a well. The assembly is located between a supply of well access line and a well, with the line running through the assembly and to the well. Multiple pulleys are incorporated into the assembly about which a well access line such as a conventional wireline may be wrapped. The pulleys are biased to one another such that slack in the line may be stored at the assembly and drawn on in the event of line tension spiking up to a predetermined amount. As such, tension in the line may be kept to a minimum so as to avoid damage to the line during a well access operation. Furthermore, should the tension in the line fail to come back down to below the predetermined amount, the well access operation may be halted in an automated manner. Halting may proceed while continuing to allow take-up of the slack in the line until completed halting of the operation is achieved.

Well access line positioning assembly

A method for determining an amount of creep for a tool on a cable and positioned in a well at an oilfield. The method includes moving a winch at a surface of the oilfield to effect movement of the tool below the surface in the well. The winch may then be stopped with the tool still in the well, but frequently the tool will continue to move, or 'creep', for some time after the winch is stopped. After the winch is stopped, data may be recorded indicative of movement of the tool. This data may then be used for the determining of the amount of creep.

Creep determination technique

An acoustic detection of a discrete acoustic signal allows to detect a leak behind a casing () of a borehole. An acoustic amplitude (AA) is sampled during a recording time period () at a determined position along the tube. Time intervals () are defined inside of the recording time period (), and for each time interval () the measured acoustic amplitudes are processed to obtain respectively a corresponding power-frequency spectrum (). A plurality of the power-frequency spectra are analyzed to identify the discrete acoustic signal by detecting time and frequency dependant changes of power. Preferably the processing involves a Fourier transform analysis. A power-frequency time plot is used to conveniently identify the discrete acoustic event.

Method and apparatus for acoustic detection of a fluid leak behind a casing of a borehole

A method is given of fracturing a subterranean formation including the step of a) pumping at least one device actively transmitting data that provide information on the device position, and further comprising the step of assessing the fracture geometry based on the positions of said at least one device, or b) pumping metallic elements, preferably as proppant agents, and further locating the position of said metallic elements with a tool selected from the group consisting of magnetometers, resistivity tools, electromagnetic devices and ultra-long arrays of electrodes, and further comprising the step of assessing the fracture geometry based on the positions of said metallic elements. The method allows monitoring of the fracture geometry and proppant placement.

Means and method for assessing the geometry of a subterranean fracture during or after a hydraulic fracturing treatment

A method of determining the depth of equipment in an underground borehole, the equipment being suspended in the borehole by means of a cable extending from the surface into the well, comprises: (i) determining the amount of cable introduced into the well at the surface; (ii) dividing the cable in the borehole into a series of elements; (iii) determining the tension in each element of the cable in the borehole; (iv) determining the stretch of the cable in the borehole for the determined tension in all elements; and (v) determining the depth of the equipment from the determined amount of cable introduced into the well from the surface and from the determined stretch of the cable in the borehole. The method can be used for correcting a depth measurement or determining an error in a depth measurement made on the cable at the surface by determining a correction factor using the methodology described above. The correction or error determination can be applied directly to log data as well as to the depth measurement.

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Paris, France

Peter Fitzgerald