78 results about "Free fluid" patented technology

An apparatus for establishing a re-usable, recurring, mechanical connection to an organ within a patient is provided. A subcutaneous needle connection system for providing bidirectional, straight and turbulent-free fluid flow access to a vascular system of a patient includes a housing defining a needle access opening for receiving a needle, a cannula opening in communication with the vascular system and a passageway connecting the needle access opening to the cannula opening. The housing can additionally have a second needle access opening connected to a second cannula opening via a second passageway. The subcutaneous needle connection system allows for blood to be removed from the vascular system via one cannula opening, passed to a hemodialysis system via a needle inserted in an associated needle access opening, treated using the hemodialysis system, and returned to the vascular system via the other needle access opening and associated cannula opening. The implantable needle connection system provides enhanced mechanical stability under the skin, improved fluid flow dynamics, improved needle hole healing potential of the skin, and improved needle edge interfacing to minimize flow turbulence and blood cell trauma during use.

A memory disc for use in a memory disc, comprising a lubricant layer which consists essentially of a non-fluid bonding lubricant, or comprises a lubricant layer which contains at least 90% of non-fluid bonding lubricant. Such memory disc is fabricated through steps of: forming a protective carbon layer; coating a lubricant on a disc substrate; subjecting the resultant substrate to an adhesion treatment to form a bonding layer of lubricant adhering to the disc substrate; and removing a free fluid layer of the lubricant remaining on the bonding layer. Thus, the memory disc has essentially no fluid component that can flow during read / write operations.

Weight lifting simulator apparatus includes a primary pneumatic cylinder providing the principal resistance for simulating weight lifting exercise with at least one secondary cylinder in free fluid interconnection with the primary cylinder whereby constant and balanced loading is achieved, with provisions for dynamic simulation of weight inertia effect, and control thereof, as in lifting a real weight. The primary and the secondary cylinders are associated with a guideway, the primary cylinder being fixed to the guideway and the secondary cylinder being slidable relative to the guideway and pivotable relative to the piston rod of the primary cylinder. Variation of the securement position of the primary cylinder on the guideway is available and valving is provided in the fluid interconnection.

Weight lifting simulator apparatus includes a primary pneumatic cylinder providing the principal resistance for simulating weight lifting exercise with at least one secondary cylinder in free fluid interconnection with the primary cylinder whereby constant and balanced loading is achieved, with provisions for dynamic simulation of weight inertia effect, and control thereof, as in lifting a real weight. The primary and the secondary cylinders are associated with a guideway, the primary cylinder being fixed to the guideway and the secondary cylinder being slidable relative to the guideway and pivotable relative to the piston rod of the primary cylinder. Variation of the securement position of the primary cylinder on the guideway is available and valving is provided in the fluid interconnection.

Weight lifting simulator apparatus includes a primary pneumatic cylinder providing the principal resistance for simulating weight lifting exercise with at least one secondary cylinder in free fluid interconnection with the primary cylinder whereby constant and balanced loading is achieved, with provisions for dynamic simulation of weight inertia effect, and control thereof, as in lifting a real weight. The primary and the secondary cylinders are associated with a guideway, the primary cylinder being fixed to the guideway and the secondary cylinder being slidable relative to the guideway and pivotable relative to the piston rod of the primary cylinder. Variation of the securement position of the primary cylinder on the guideway is available and valving is provided in the fluid interconnection.

The invention discloses a low-permeability sandstone reservoir pore structure quantitative inversion method based on nuclear magnetic resonance. The method comprises the following steps: I, selecting a basic sample; II, classifying the type of a pore structure; III, establishing a well logging chart for identifying the pore structure; IV, establishing a pore throat distribution inversion formula according to the type of the pore structure; V, verifying the accuracy of the formula; VI, identifying the type of the pore structure of a shaft section by utilizing the well logging chart; VII, quantitatively inverting the distribution of free fluid pore throats by utilizing a nuclear magnetic resonance well logging T2 spectrum. The method has the following beneficial effects: a reliable method and technology are provided for quantitatively evaluating the pore structure, and the research concept of the current method can be broken through. The continuous free fluid pore throat distribution can be inverted by virtue of the nuclear magnetic resonance well logging, so that direct evidence is provided for evaluating the effectiveness of the low-permeability sandstone reservoir, application of the well logging information in the quantitative inversion of the micro pore structure of the reservoir is favorably explored, and the application and development of the nuclear magnetic well logging technology can be promoted.

Arrangements for promoting the restriction of fluid flow along a shaft via providing a deformable ring member in an annulus between the shaft and housing. In an initial general condition, the deformable ring member permits free fluid flow in a general direction along the shaft while in a second, constricted condition, the deformable ring closes or blocks a gap or clearance normally conducive to free fluid flow to thereby restrict fluid flow. An actuation medium, which can take any of a very wide variety of forms, preferably promotes constriction of the deformable ring member directly or indirectly.

A method is given for creating a fracture, in a subterranean formation, that has a fluid flow barrier at the top, at the bottom, or at both the top and the bottom. The method is applied before or during a conventional hydraulic fracturing treatment and is used to limit undesired vertical growth of a fracture out of the productive zone. A lower-viscosity pad fluid is used to initiate the fracture; a higher-viscosity fluid containing barrier particles is then injected; a lower-viscosity particle-free fluid is then injected to promote settling (or rising) of the barrier particles and to finger through the slug of barrier particles and cut it into an upper and lower portion. If the barrier is to be at the bottom of the fracture, the barrier particles are denser than the fluids; if the barrier is to be at the top of the fracture, the barrier particles are less dense than the fluids. Optionally, between the barrier transport stage and the subsequent lower-viscosity stage, there may be a stage of a higher viscosity particle-free fluid that pushes the barrier particles farther into the fracture. To provide both upper and lower particles in one treatment, the pad stage may be of higher-viscosity, or the barrier particles may include particles less dense than, and more dense than, the fluid.

A fluid dispenser for germ-free fluid is described incorporating at least one material being capable of interacting via an oligodynamically active substance. The dispenser includes a metering pump and inlet and outlet valves. The fluid coming into contact with at least one oligodynamically active substance is present in the region of the outlet valve, of the inlet thereto and / or the outlet therefrom.

The present invention relates to the composition, preparation method and use of a solids-free drilling fluid system formulated with a mixture of divalent heavy brines, which is resistant to high pressures and high temperatures. The system has the special feature that it significantly reduces productive-formation permeability damage as it uses mixtures of different salts of water-soluble divalent metals to provide the features of density, polymers and special additives to provide the system with the physicochemical properties that any fluid for drilling, completing and repairing wells requires in order to fulfill the functions thereof and to provide heat resistance up to 200° C. A main feature of the present invention is that the composition that embeds the drilling / completing / repairing of oil wells fluid contains synthetic polymers and biopolymers that do not require large amounts of time, high shear speeds or heating for hydration thereof in divalent metal salt derived simple or binary brines.

Methods for maintaining the rheology and reducing the fluid loss of chrome-free, aqueous-based wellbore fluids under high temperature-high pressure conditions are disclosed. The method may comprise formulating the chrome-free, aqueous wellbore fluid with an aqueous base fluid, at least one chrome-free viscosifier, at least one chrome-free fluid loss control additive, at least one chrome-free dispersant; and circulating the chrome-free aqueous-based wellbore fluid in a wellbore at temperatures exceeding 300° F.

A re-circulating fluid delivery system includes an air-fluid separator structure, a fluid plenum in fluid communication with the separator structure, and a free fluid reservoir. A fluid re-circulation path fluidically couples the separator structure, the fluid plenum and the free fluid reservoir. A pump structure re-circulates fluid through the re-circulation path during a pump mode, wherein air bubbles may be separated from re-circulated fluid.

A fluid dispenser for germ-free fluid is described incorporating at least one material being capable of interacting via an oligodynamically active substance. The dispenser includes a metering pump and inlet and outlet valves. The fluid coming into contact with at least one oligodynamically active substance is present in the region of the outlet valve, of the inlet thereto and / or the outlet therefrom.

The present invention relates to a method for testing multiple analyte concentrations within a biosensor system through a single injection of sample. The method involves flowing a fluid sample containing a neat analyte concentration along a flow path in a fluid system and diluting the sample by causing it to merge with a fluid that is free of analyte in a second flow path under laminar flow conditions. The merged fluid stream is directed through a turbulent third flow path of a very low dead volume. The third flow path carries the merged fluid stream to a sensing region where the analyte is exposed to an immobilized ligand. The concentration of analyte can be controlled in this method by adjusting the flow rates of the sample flow and analyte-free fluid flow. A fluidic system for carrying out this method is also disclosed.

Provided herein are methods and apparatus for collecting and preserving core samples from a reservoir. In some embodiments, a method includes obtaining core samples from a reservoir using a rock and fluid sampling tool and depositing the core samples in a vessel filled with a hydrogen-free fluid such that a portion of the hydrogen-free fluid is displaced by the core samples and the core samples are immersed in the hydrogen-free fluid. The method also includes transferring a gas into the vessel to occupy a space in the vessel and sealing the vessel via a cap on an end of the vessel. Methods of analyzing the core samples core samples collected from a reservoir and a rock and fluid sampling tool are also provided.

The present invention relates to a method for testing multiple analyte concentrations within a biosensor system through a single injection of sample. The method involves flowing a fluid sample containing a neat analyte concentration along a flow path in a fluid system and diluting the sample by causing it to merge with a fluid that is free of analyte in a second flow path under laminar flow conditions. The merged fluid stream is directed through a turbulent third flow path of a very low dead volume. The third flow path carries the merged fluid stream to a sensing region where the analyte is exposed to an immobilized ligand. The concentration of analyte can be controlled in this method by adjusting the flow rates of the sample flow and analyte-free fluid flow. A fluidic system for carrying out this method is also disclosed.

Weight lifting simulator apparatus includes a primary pneumatic cylinder providing the principal resistance for simulating weight lifting exercise with at least one secondary cylinder in free fluid interconnection with the primary cylinder whereby constant and balanced loading is achieved, with provisions for dynamic simulation of weight inertia effect, and control thereof, as in lifting a real weight. The primary and the secondary cylinders are associated with a guideway, the primary cylinder being fixed to the guideway and the secondary cylinder being slidable relative to the guideway and pivotable relative to the piston rod of the primary cylinder. Variation of the securement position of the primary cylinder on the guideway is available and valving is provided in the fluid interconnection.

The invention relates to the technical field of stuck freeing agents used in oilfield drilling production, in particular to an acid-in-oil stuck freeing fluid and a production method and a use methodthereof. The acid-in-oil stuck freeing fluid comprises the components as follows: acid, diesel oil, a crude oil activating agent, an inhibitor, an iron ion stabilizing agent and balance of water. Theacid-in-oil stuck freeing fluid and a mud cake can instantaneously generate a chemical reaction to destroy the chemical structure of the mud cake and release ordinary differential sticking or extremedifferential sticking; a stuck freeing method has no adverse influence on the performance of a drilling fluid, no damage to a drilling string or a well wall, and the characteristics of short time andrapid effect taking, thereby greatly improving the speed for processing such accidents, saving time and reducing loss.

The invention discloses an oil-based stuck freeing fluid for well drilling, characterized by consisting of the following mixed ingredients based on weight percent: 4%-5% of organic soil, 1%-1.5% of primary emulsion, 0.5%-1% of secondary emulsion, 4%-5% of an anti-stuck agent, 5%-6% of quicklime and the balances of diesel oil and a quick penetrant. The invention overcomes the defects of long immersion time and inferior stuck freeing efficiency in the conventional and foreign normal oil-based stuck freeing fluids at present, and can rapidly and efficiently settle the accident of adhesion differential pressure sticking that happens in drilling.

The present invention features a freestanding microfluidic pipette with both solution exchange capability and fluid re-circulation, enabling highly localized and contamination- free fluid delivery within a confined volume in the vicinity of the pipette exit. Preferably, the device features direct positioning, so the pipette can be directed at a point or object of interest, such as a biological or artificial cell, a defined surface area or a sensor element within an open volume, using micro- or nanopositioning techniques. One aspect of the invention provides a free-standing pipette. The free-standing pipette includes a microfluidic device comprising one or more channels with exits leading into an open-volume and a positioning device programmed to hold the microfluidic device at an angle from a horizontal axis.

A fluid container, including a body having a base surface, a capillary fluid volume disposed over the base surface, and an outlet compartment having at least one outlet wall disposed within the body and extending from the base surface into the capillary fluid volume. The body also includes at least two fluidically segregated free fluid compartments, where each compartment includes at least one sidewall disposed within the body. The at least one sidewall includes a compression edge wherein at least a portion of the compression edge is flush with the at least one outlet wall edge.

The present invention features a freestanding microfluidic pipette with both solution exchange capability and fluid re-circulation, enabling highly localized and contamination- free fluid delivery within a confined volume in the vicinity of the pipette exit. Preferably, the device features direct positioning, so the pipette can be directed at a point or object of interest, such as a biological or artificial cell, a defined surface area or a sensor element within an open volume, using micro- or nanopositioning techniques. One aspect of the invention provides a free-standing pipette. The free-standing pipette includes a microfluidic device comprising one or more channels with exits leading into an open-volume and a positioning device programmed to hold the microfluidic device at an angle from a horizontal axis.

A Gas-free Fluid chamber for PCR. The present invention relates to a device with a fluid chamber suitable for performing a polymerized chain reaction for gas-free filling. Such devices may be used in the field of e.g. molecular diagnostics.

A system for delivering pressurized fracking fluid to a well includes a high-pressure pump pumping proppant-free fluid, and a double-piston pressure transfer arrangement for transferring pressure from the proppant-free fluid to a fracking fluid. The pressure transfer arrangement includes first and second cylinder assemblies, each having a piston in sliding engagement within a first hollow cylinder so as to define first and second chambers of the first cylinder and third and fourth chambers of the second cylinder. A piston rod interconnects the pistons. A flow selector alternately directs high-pressure proppant-free fluid to the first chamber and the third chamber so as to act on the pistons, thereby applying pressure to fracking fluid within the second and fourth chambers, respectively, for delivery to the well in alternate power strokes. The faces of the pistons facing the first and third chambers have a smaller effective surface area than the faces towards the second and fourth chambers such that pressure in the fracking fluid remains lower than pressure in the proppant-free fluid.

The presented invention provides a detection method for free fluid in the human body. The preprocessing procedure is applied to reduce the speckle noise and enhance tissue volumetric pixels (voxels) intensity levels to make tissue and non-tissue voxels more distinguishable from each other. An initial surface selection step provides flexibility to either manually or automatically selecting a seed point to segment fluid regions in the volumetric data. A kidney and liver organ detection procedure provides a method for determining whether the detected fluid region is a normal fluid-carrying body organ or if it is due to a medical condition as a free fluid region. A combinational approach using a 3-dimensional Snake and Level-Set is utilized to accurately detect fluid regions in the volumetric ultrasound data.

The invention relates to a leakage-free fluid damper, which comprises a disc, a bottom disc flange which is arranged opposite to the disc, a hydraulic cylinder for making the circular disc and the bottom circular disc flange in leakage-free connection, a disc flange provided with a fifth aperture, and a cylinder with disc flanges at two open ends, wherein the upper end of the cylinder with the disc flanges at the two ends is provided with an upper end disc flange; and the lower end of the cylinder with the disc flange at the two ends is provided with a lower end disc flange. A piston in the damper is dragged to move by magnetic force; when the piston moves, the damping fluid flows through a small round through hole on the piston; and the energy is consumed when the damping fluid flows through the small round through hole on the piston, and an effect of controlling vibration is achieved. Therefore, a sealing piece is not used, and the damping fluid hardly leaks from the damper.

Provided herein are methods and apparatus for collecting and preserving core samples from a reservoir. In some embodiments, a method includes obtaining core samples from a reservoir using a rock and fluid sampling tool and depositing the core samples in a vessel filled with a hydrogen-free fluid such that a portion of the hydrogen-free fluid is displaced by the core samples and the core samples are immersed in the hydrogen-free fluid. The method also includes transferring a gas into the vessel to occupy a space in the vessel and sealing the vessel via a cap on an end of the vessel. Methods of analyzing the core samples core samples collected from a reservoir and a rock and fluid sampling tool are also provided.

A solids removal system for use in removing sand and silt from well production fluids. The system has a manifold assembly provided with jetting nozzles, which is installed in a liquid- and solids-containing vessel, where solids have settled in the walls. The jetting nozzles deliver, in a pre-determined sequence, a solids-dislodging fluid, causing the solids to become suspended in the fluid. The dislodged solids and fluid are then extracted by pump from the vessel and directed to a solid-fluid separator. Solids-free fluid is returned for re-re-circulation through the vessel, while the solids are moved to a containment location.

A solids removal system for use in removing sand and silt from well production fluids. The system has a manifold assembly provided with jetting nozzles, which is installed in a liquid and solids-containing vessel, where solids have settled in the walls. The jetting nozzles deliver, in a pre-determined sequence, a solids-dislodging fluid, causing the solids to become suspended in the fluid. The dislodged solids and fluid are then extracted by pump from the vessel and directed to a solid-fluid separator. Solids-free fluid is returned for re-re-circulation through the vessel, while the solids are moved to a containment location.