A biosensor device (10) for in situ monitoring of deep-water sea-floor biological patterns (30), which biosensor platform (10) comprises a plurality of cameras (12) and a lightening system (14), wherein a plurality of coral nubbins (16) with a plurality of polyps (18) are prepared and fixed to a platform (11) of the biosensor platform (10) with a distance to each other such that there is no overlap on a picture frame (22) thereof, and wherein the cameras (12) and the lightening system (14) are arranged so as to take coral-silhouette-pictures (CSP:s) of the plurality of nubbins (16) in the picture frame (22). In this way, there is provided a biosensor device based on coral, or other deep-sea species, behavioural for surveillance and monitoring of a deep-water sea-floor.

A fixture for receiving a tool that facilitates communication between a tool and other equipment. The fixture includes a shroud sized to at least partially cover a circumference of a housing of the tool, and one or more current transformers or sensors which are coupled to the shroud. Each current transformer can inductively receive or inject, through the housing, a current from or into electronics contained within the housing of the tool. The induced current can be part of the communication between the tool and the equipment. The communication can be a data communication between the tool and the equipment, a transfer of electrical power from the equipment to the tool, or both. The tool can be a closed cavity without electrical or magnetic interfaces.

There is provided a wellbore characteristic measurement assembly comprising a dispensing mechanism and a plurality of the wellbore characteristic measurement apparatuses. Each one of the wellbore characteristic measurement apparatuses, independently, is mountable to the dispensing mechanism in a releasably retained condition. The dispensing mechanism is configured for serially dispensing each one of the wellbore characteristic measurement apparatuses, independently, into the wellbore.

A method for estimating values of well log measurements of a first selected type in wellbore sections wherein the measurements of the selected type are determined not to be valid includes establishing a linear relationship between measurements of a first selected type and measurements of a second selected type. The measurements of the second selected type are substantially valid over an entire measured axial section of the wellbore. Correct values of the measurements of the first type in the wellbore sections using measured values of the second type and the linear relationship.

Systems, apparatuses, and methods for measuring material thickness of one or more casings using a permeable core are presented. A magnetic field is generated using a permeable core and transmitted through one or more casings. Moreover, one or more receivers measure changes to the magnetic field.

A method and a device for detecting collisions for a vehicle. In this context, an at least three-stage method is described. A first collision check, a second collision check, and a third collision check are performed. Surface areas are considered step-by-step along a section of a trajectory of the vehicle. In the individual steps, the surface areas in the individual steps being approximated to the actual swath of the vehicle.

Methods, computer programs, and systems for detecting at least one downhole condition are disclosed. Pressures are measured at a plurality of locations along the drillstring. The drillstring includes a drillpipe. At least one of the pressures is measured along the drillpipe. At least one downhole condition is detected based, at least in part, on at least one measured pressure.

Anisotropic elastic properties and subsequently in situ stress properties for a rock formation surrounding a wellbore are computed from rock physics and geomechanical models. Mineralogy data measured from DRIFTS on cuttings from the wellbore and rock physics and geomechanical models that have been log-calibrated in another wellbore are used in the computation. The method includes: (1) Defining and calibrating rock physics and geomechanical models using data from the first wellbore; (2) using DRIFTS analysis to measure mineralogy data on rock cuttings obtained through drilling operation in the second wellbore; and (3) using previously calibrated models to estimate in situ stress properties, including a stress index and the minimum principal stress magnitude.

Systems, methods, and computer-readable media for channel estimation in mud pulse telemetry based on a preamble waveform. A system located at a first location of a wellbore can receive, from a second device located at a second location of the wellbore, a signal including a Golay preamble waveform and data symbols. The Golay preamble waveform can be based on Golay complementary codes. Based on a measurement associated with the signal, the system can then detect the Golay preamble waveform in the signal. Next, the system can estimate a characteristic of a communication channel between the first location and the second location based on the detected Golay preamble waveform.

Provided in some embodiments are systems and methods for transient-pressure test of an oil reservoir water injection well system. Embodiments provide for determining a fracturing injection rate for the well, setting a test injection rate preferably below the fracturing injection rate, conducting a stabilized injection of water into a wellbore of the well at the test injection rate for a prescribed period, and conducting a fall-off test including shutting-in the well for a prescribed fall-off period, and acquiring test data indicative of fluid pressure in the wellbore of the well during the injection and the fall-off periods. Embodiments also provide for generating a model prediction, comparing the model to the test data to determine whether it is a match for the well, and associating the parameter values with the well, including the severity and the location of the shallow damage, if the reservoir model is a match.