Abstract:
The present disclosure relates to making seismic measurements using a seismic source disposed in a wellbore. One or more seismic sources are provided and carried on a conveyance mechanism. One or more seismic receivers are provided and placed on or near the earth's surface, the same wellbore as the seismic sources, or in another wellbore. The one or more seismic sources are run into and/or out of the wellbore using controller or sequencer. The one or more seismic sources are positioned, manually or automatically, at one or more locations in the wellbore, using a set of computer-controlled instructions. Seismic measurements are made at one or more locations by activating one or more seismic sources and detecting a seismic source signal using seismic receivers. The receivers may be carried on a conveyance mechanism and their position controlled, manually or automatically, using the set of computer-controlled instructions.
Abstract:
A treatment process for an aqueous phase which contains oil droplets, which may be droplets of 10-50nm diameter in aqueous flow from a hydrocyclone separator, comprises bringing the water into contact with a surface subdivided into areas of differing surface energy and affinity for oil and such that when the surface is submerged in an aqueous phase, oil droplets adhere to it with an apparent contact angle in a range from 90 to 150 degrees. In some embodiments, areas of the surface reduce their affinity for oil in response to an external stimulus, and the process comprises applying the external stimulus to cause controlled release of droplets adhering to the surface. The process may be used to remove oil droplets from water produced by an oil or gas well, after downhole oil water separation or after production at a at a well head, or used to coalesce droplets in such water to a larger size to enable conventional separation.
Abstract:
A shifting tool for use in shifting axial position of a shiftable element in a well. The tool comprises a linkage mechanism configured to translate an independent axial force into a dedicated radial force applied to expansive elements thereof. Thus, the elements may radially expand into engagement with the shiftable element free of any substantial axial force imparted thereon. As such, a more discretely controllable shifting actuation may be attained, for example, as directed from an oilfield surface. Indeed, real-time intelligent feedback may also be made available through use of such elements in conjunction with the noted linkage mechanism.
Abstract:
A method, a system, and an apparatus are described for the data acquisition in the well-logging of a borehole wall during the investigation of formation properties. Data acquisition is conducted by either an adaptive phase compensation processing or a modulus mode processing, both of which use in-phase and out-of-phase current components to obtain current values. Adaptive phase compensation employs a calculation of a phase shift compensation value, which may then be applied to subsequent acquisitions and can be further processed in the generation of an image of the borehole wall.
Abstract:
The current application discloses fluids and methods for treating a subterranean formation penetrated by a wellbore, such as hydraulic fracturing. In one aspect, there is provided an oilfield fluid comprising chitosan at an amount sufficient to inhibit the growth of bacterial in the oilfield fluid. In another aspect, there is provided a method of preserving an oilfield fluid containing adding chitosan at a concentration that is sufficient to inhibit the growth of bacteria in the oilfield fluid. In a further aspect, there is provided a method of treating a subterranean formation penetrated by a wellbore, comprising preparing a treatment fluid, adding chitosan at a concentration sufficient to inhibit the growth of bacteria in the treatment fluid, introducing the mixture to the subterranean formation, and treating the subterranean formation with the mixture.
Abstract:
A technique facilitates actuation of a downhole tool, such as a valve, in a simple, rapid, and cost-effective manner. The technique comprises installing the downhole tool with a trip saver. The trip saver can be actuated by increasing a tubing pressure or other suitable pressure source beyond a threshold level. Once the trip saver is actuated, a fluid under suitable pressure is provided to a downhole tool through a passageway opened via the trip saver. This enables actuation of the downhole tool to a desired state.
Abstract:
Systems and methods for preventing particles from flowing into a base pipe are provided. A base pipe can have a plurality of perforations formed radially therethrough. A filtering strip can be wrapped helically around an outer surface of the base pipe to cover at least a portion of the perforations. The filtering strip can include a drainage layer, a filter layer, and a shroud layer. The drainage layer can include a plurality of ribs in contact with the outer surface of the base pipe. The filter layer can be coupled to the drainage layer and include at least one mesh screen. The shroud layer can be coupled to the filter layer and include a perforated metal sheet.
Abstract:
The current application discloses a method of treating a portion of a subterranean formation comprises providing a treatment fluid comprising a carrier fluid, a non-hydrolyzed polyacrylamide or a nonhydrolyzed non ionic copolymer of acrylamide, and a delaying agent; and treating the subterranean formation.
Abstract:
Described is a method for treating a subterranean formation penetrated by a wellbore, the method including the introduction of a well treatment fluid containing at least an encapsulated biocide. Once the encapsulated biocide is introduced and after a predetermined period of time, a biocide is released from an encapsulation material and treats the wellbore and the subterranean formation.
Abstract:
Properties of a porous solid sample19, which may be a core of rock taken from below ground are carried out using apparatus which performs both nuclear magnetic resonance (NMR) and porosimetry measurements. The apparatus has a magnet 11,12 providing a magnetic field and a radiofrequency coil 20 for transmitting and/or receiving electromagnetic radiation so as to bring about NMR in the magnetic field, a pressure vessel 14, 15 to hold a sample19within the magnetic field, a supply of a non-wetting liquid connected to the vessel, means to apply pressure to the non-wetting liquid to force liquid into pores of the sample19 means to measure applied pressure of the non-wetting liquid and means to measure volume thereof taken up by the sample. The pressure of non- wetting liquid may be increased in steps, using intruded liquid volume at each step to give a measurement of pore throat size using NMR at each step to give a measure of pore size such as diameter of equivalent sphere. The non-wetting liquid may be mercury and NMR may observe the Knight shift of 99 Hg,