Abstract:
Systems and methods for boosting low content of received signals involve a vessel towing port side and starboard side impulsive source arrays. The port side and starboard side impulsive source arrays are selectively actuated for a plurality of sequential shots having different signatures.
Abstract:
A cable for land based seismic array system includes a plurality of fibers, an aramid strength member, and a thermoplastic polyurethane (TPU) Jacket, wherein a total number of the plurality of fibers is greater than or equal to 48, a diameter of the cable is less than 10 millimeter (mm), and a weight of the cable per unit distance is less than 50 kilogram (Kg) / kilometer (Km).
Abstract:
A marine streamer spread (800) for acquiring seismic data, the spread including a streamer (801) having a first portion (808) and a second portion (810); the first portion (808) including both first pressure sensors (902) and pressure derivative sensors (904) for acquiring the seismic data; and the second portion (810) including second pressure sensors (902). The first portion (808) imparts ghost diversity to the seismic data by having a variable-depth profile and the pressure derivative sensors (904) impart polarity diversity to the seismic data.
Abstract:
Embodiments of the invention provide methods, systems, and apparatus for collecting seismic data in a marine environment. An ocean bottom cable (OBC) comprising a plurality of sensor nodes for collecting seismic data may be deployed to and retrieved from an ocean bottom during seismic operations using a winch. Such deployment and retrieval operations may exert substantial stress on the OBC at an interface between the sensor nodes and cable segments of the OBC. A reinforcement sleeve is provided to reduce the mechanical stress at such interfaces.
Abstract:
A seismic streamer and associated method are provided. The seismic streamer may include a seismic streamer core having a cylindrical configuration. A melt-processable thermoplastic layer may be coupled with the seismic streamer core, the melt-processable thermoplastic layer being extruded to form a first tube. An elastomeric layer may be coupled with the melt-processable thermoplastic layer, the elastomeric layer being extruded to form a second tube.
Abstract:
A vibration isolation section (20) for use in a seismic streamer system, the section (20) including: a resilient sheath (30) arranged to be connected end-to-end in a seismic streamer (16) system and receive axial loads transmitted through the system, wherein the resilient sheath (30) is configured to stretch upon receiving an axial load and substantially convert the axial load into a radial stress; and a first support structure (42) housed within a first portion (31) of the resilient sheath(30), the first support structure (42) including one or more members having substantially constant diameter under load which provides a reaction to the radial stress, thereby reacting to the received axial load; and a second support structure housed at least in part within a second portion (33) of the resilient sheath(30), the second support structure including an enclosed fixed volume fluid filled flexible chamber (46) at least partially housed within the second portion (33) of the resilient sheath (30), the fluid filled flexible chamber (46) providing a reaction to the radial stress thereby reacting to the received axial load.
Abstract:
Sensor stations, system and methods for sensing seismic parameters of a subsurface structure are provided. The sensor station includes a sensor housing and a sensor unit. The sensor housing includes a base with a removable lid and receptacles for receiving the fiber optic cable therethrough. The base has a cavity therein accessible upon removal of the removable lid. The sensor unit is positionable in the cavity of the sensor housing. The sensor unit is operatively connectable to a portion of the optical fibers of the fiber optic cable for communicating seismic data sensed by the sensor unit.
Abstract:
Die Erfindung betrifft ein Trägermodul 20 für eine akustische Unterwasserantenne 4 mit wenigstens einem elektroakustischen und/oder optoakustischen Wandlerelement 32, wobei das Trägermodul 20 ein aus wenigstens zwei Teilen bestehendes Formstück zum Aufnehmen der Wandlerelemente 32 aufweist. Das Formstück verfügt über eine zentrale axiale Öffnung 38 zum Durchführen eines Zugseils und wenigstens eine lösbare Verbindung zwischen den Teilen des Formstücks zum Öffnen oder Schließen des Trägermoduls 20. Ferner betrifft die Erfindung eine akustische Unterwasserantenne 4, insbesondere eine Schleppantenne 4, mit wenigstens einem, vorstehend beschriebenem Trägermodul 20 sowie ein entsprechendes Verfahren zum Befestigen eines derartigen Trägermoduls 20 auf dem Zugseil dieser Unterwasserantenne 4.
Abstract:
A device (1) for cleaning objects in a body of water (2) is described, the device (1) including : - a plurality of cleaning elements (3); - a plurality of supporting elements (5); and - a collar (7), to which first ends of the supporting elements (5) are attached, characterized by the cleaning elements (3) being attached to the supporting elements (5); and by one or more of the supporting elements (5) sloping with its/their second, free end(s) in towards at least one point (PI, P2, P3) outside the collar (7), so that the supporting elements (5) and the collar (7) form at least one funnel. A method of cleaning objects in a body of water (2) is described as well, the method using a cleaning device (1).