Abstract: A core for use in railcar coupler part casting processes is provided. The core has a hollow body, a top with a first opening defined therein, a bottom having a generally rounded wall, and second and third openings defined in the side wall of the body.

Abstract: A die casting system includes a die having a plurality of die elements that define a die cavity. A charge of material is received in the die cavity. The charge of material may comprises a refractory metal intermetallic composite based material system. The charge of material may also comprise a composite material.

Abstract: A thermally insulated enclosure manufactured in pre-assembled or kit form, and constructed of prefabricated insulated sandwich panels, or structural insulated sandwich panels in some embodiments, rated for relatively high operating temperatures and designed for the storage of thermal energy in solid phase particulate storage medium or media at up to 125 deg C. and possibly higher. Said energy storage medium or media will typically be sand, gravel, or other powder or granulated material, or combination thereof, and optionally some proportion of phase change material. Said insulated enclosure is designed to accommodate a variety of heat transfer device designs in storing solar energy and off-peak-generated electric energy. The primary applications for the invention are expected to be in domestic hot water heating, space heating, and process heating, however in addition the thermal energy retained in the enclosure can also be used in powering the refrigeration cycle in some space cooling systems.

Abstract: Some modular heat-transfer systems can have an array of at least one heat-transfer element being configured to transfer heat to a working fluid from an operable element. A manifold module can have a distribution manifold and a collection manifold. A decoupleable inlet coupler can be configured to fluidicly couple the distribution manifold to a respective heat-transfer element. A decoupleable outlet coupler can be configured to fluidicly couple the respective heat-transfer element to the collection manifold. An environmental coupler can be configured to receive the working fluid from the collection manifold, to transfer heat to an environmental fluid from the working fluid or to transfer heat from an environmental fluid to the working fluid, and to discharge the working fluid to the distribution manifold.

Abstract: The present invention relates to a close-loop temperature equalization device with single flowpath utilizing the heat exchange fluid for transmitting thermal energy of a natural thermal energy storage body to an external temperature differentiation body, and is provided with one or more than one of following structural devices, including: 1) installing an operation port (111) and a sealing plug (110) at the upper end of the top corner of a close-loop flowpath at a higher location of the heat releasing device (201); 2) forming an outward-expanding arc-shaped flowpath structure turning locations of the close-type flowpath; 3) installing an auxiliary heating/cooling device (115); 4) installing an auxiliary fluid pump (107); 5) installing a heat exchange fluid temperature sensing device (TS201); 6) installing an environment temperature sensing device (TS202); and 7) installing an electric energy control unit (ECU200).

Abstract: The present invention relates to a close-loop temperature equalization device with single flowpath utilizing the heat exchange fluid for transmitting thermal energy of a natural thermal energy storage body to an external temperature differentiation body, and is provided with one or more than one of following structural devices, including: 1) installing an operation port (111) and a sealing plug (110) at the upper end of the top corner of a close-loop flowpath at a higher location of the heat releasing device (201); 2) forming an outward-expanding arc-shaped flowpath structure at turning locations of the close-type flowpath; 3) installing an auxiliary heating/cooling device (115); 4) installing an auxiliary fluid pump (107); 5) installing a heat exchange fluid temperature sensing device (TS201); 6) installing an environment temperature sensing device (TS202); and 7) installing an electric energy control unit (ECU200).

Abstract: The present invention relates to a close-loop temperature equalization device with multiple flowpath utilizing the heat exchange fluid for transmitting thermal energy of a natural thermal energy storage body to an external temperature differentiation body, and is provided with one or more than one of following structural devices, including: 1) installing an operation port (111) and a sealing plug (110) at the upper end of the top corner of a close-loop flowpath at a higher location of the heat releasing device (201); 2) forming an outward-expanding arc-shaped flowpath structure at turning locations of the close-type flowpath; 3) installing an auxiliary heating/cooling device (115); 4) installing an auxiliary fluid pump (107); 5) installing a heat exchange fluid temperature sensing device (TS201); 6) installing an environment temperature sensing device (TS202); and 7) installing an electric energy control unit (ECU200).

Abstract: A ventilation apparatus is provided. The apparatus may include a casing having first and second indoor air suction holes formed at opposite ends thereof, an indoor air discharge hole and an outdoor air suction hole formed at a rear side thereof, and an outdoor air discharge hole formed at an upper side thereof. First and second heat exchanger installed within the casing, with a partition plate partitioning the interior of the casing into an indoor air exhaust chamber and an outdoor air suction chamber having an exhaust fan disposed and first and second supply fans respectively provided therein. Use of first and second air supply fan may reduce noise generated during operation, and simplified indoor and outdoor air flow paths may further reduce noise and enhance efficiency.

Abstract: One aspect of the disclosure is directed to a heat sink assembly for dissipating heat from an electronic component. The heat sink assembly includes a heat sink having a base and at least one fin extending from the base. The at least one fin has an opening formed therein that is configured to receive a fastener. The heat sink assembly also includes a clip. The clip has a first portion configured to receive the fastener and at least one second portion flexibly coupled to the first portion. The at least one second portion is configured to secure the heat sink to the electronic component proximate to the base in response to a force being applied to the first portion by the fastener.

Abstract: There is described a system for controlling the temperature in a structure that has exterior walls. At least a portion of at least one exterior wall comprises a cement core having a layer of insulation on an interior face and an exterior face of the cement core, and at least one fluid conduit embedded in the cement core. A source of temperature-controlled fluid is connected to the at least one fluid conduit.

Abstract: The field of the invention relates to systems and methods for exchanging heat from the degradation, decomposition, and chemical/biochemical transformation of municipal, industrial, and other types of waste. In one embodiment, a heat extraction system may include a closed-loop fluid circulation piping channeled throughout at least one heat extraction well oriented throughout a waste mass. The piping is fluidly coupled to a heat exchanger. A first circulation fluid is circulated through the closed-loop circulation piping into various depths of the waste mass to transfer thermal energy between said mass and said heat exchanger. In one embodiment, the transfer of thermal energy between the waste mass and the heat exchanger is used as alternative energy method and to control at least one of shear strength, compressibility, and hydraulic conductivity of the waste mass.

Abstract: A phase change cooler of the present invention includes: a plurality of heat receiving units that cause a refrigerant to change phase from liquid to gas by heat received from a heat generating body; one heat radiating unit that causes the refrigerant to change phase from gas to liquid by radiating heat to surrounding area; a plurality of vapor tubes that respectively transport the refrigerant in a vapor state from each of the heat receiving units to the heat radiating unit; a liquid tube that respectively circulates the refrigerant in a liquid state from the heat radiating unit to each of the heat receiving units; and a bypass tube that connects each of the heat receiving units to each other.

Abstract: A cooling system for cooling an electronic device includes a first heat exchanger, a second heat exchanger, a first refrigerant pipe, a second refrigerant pipe, and a pump. The first and second refrigerant pipes receive refrigerants, which can circulate in the first and second heat exchangers. The first heat exchanger is arranged in the electronic device for cooling the electronic device. The second heat exchanger is used for cooling the refrigerants by gasifying liquefied gas. The pump is used for circulating the refrigerants.

Abstract: A fan includes an air movement implement including a blade and a motor that drives the air movement implement. The motor includes a rotor that includes an internal diameter heat exchanger and a heat pipe having a first end and a second end, the first end in thermal contact with the internal diameter heat exchanger and the second end in thermal contact with the blade.

Abstract: A vapor chamber is configured to conduct heat generated by a heat-generating element and includes a bottom plate, a first wick structure, a second wick structure, a cover plate and a working fluid filled between the cover plate and the bottom plate. One side of the bottom plate has a heated protrusion in thermal contact with the heat-generating element, and the other side is formed with an accommodating trough corresponding to the heated protrusion. The first wick structure is provided in the accommodating trough. The second wick structure is disposed on the bottom plate and provided with an opening and a plurality of airflow channels in communication with the opening. The cover plate tightly covers the bottom plate. The supporting posts are sandwiched between the cover plate and the first wick structure. By this arrangement, the mounting and heat-conducting of the heat-generating element can be achieved.

Abstract: A heat sink assembly includes a fin module, heat pipes, and a pair of side plates. The fin module is composed of a plurality of fins and has a flat side formed with a trough and two recesses. Each of the heat pipes has an evaporation section. The evaporation sections are parallelly accommodated in the trough and in contact with each other. The side plates are separately fixed in the recesses and protrude from the flat side. The evaporation sections are formed with a flat surface coplanar with the side plates. By this arrangement, the thermal contact area between the heat pipes and a heat source is increased to thereby improve the heat-dissipating efficiency of the heat sink assembly.

Abstract: One embodiment can include a heat exchange system for heat exchange with a heat source and a cold source. The system can include a circulation loop. The circulation loop can include a heat emission portion configured to exchange heat with the cold source and a heat absorption portion configured to exchange heat with the heat source, the heat absorption portion comprising a channel. The embodiment can include a liquid pump configured to circulate a liquid through the circulation loop, from an inlet of the channel to an outlet of the channel and a bubble injector coupled to the circulation loop proximal to the inlet of the channel and configured to flow a gas to form a plurality of gas bubbles in the channel, with each of the plurality of gas bubbles monodispersed across the channel, with segments of liquid separating successive gas bubbles of the plurality of gas bubbles.

Abstract: A close-loop temperature equalization device utilizing the heat exchange fluid to transmit the thermal energy of a natural thermal energy storage body to an external temperature differentiation body, and including one or more than one of following structural devices, including: 1) installing an operation port (111) and a sealing plug (110) at the upper end of the top corner of a close-loop flowpath formed at a higher location of the heat releasing device (201); 2) forming an outward-expanding arc-shaped flowpath structure at turning locations of the close-type circulation flowpath; 3) installing an auxiliary heating/cooling device (115); 4) installing an auxiliary fluid pump (107); 5) installing a heat exchange fluid temperature sensing device (TS201); 6) installing an environment temperature sensing device (TS202); and 7) installing an electric energy control unit (ECU200).

Abstract: A static dissipating agent (SDA) dispersion apparatus and method disperses an SDA into a coolant system from a filter having a filter material and an SDA suspended within the filter material.

Abstract: Provided is a double tube type heat exchange pipe, in which a gas or liquid coolant passes through a flow path hole to cool an inner tube, the gas or liquid coolant supplied through through-holes of an outer tube is collected in a first collecting groove formed in an inner tube, the gas and liquid coolant is guided to a spiral groove of the inner tube and continuously collides with a plurality of protrusions to undergo heat exchange and be cooled, and the cooled gas and liquid coolant is collected in a second collecting groove of the inner tube to be discharged to the outside via the through-hole of the outer tube.

Abstract: A heat exchanger for an oil cooler including at least two heat exchanger members, each of which enclosing a first channel. A second channel is formed between the two heat exchanger members. An edge portion of a first one of the heat exchanger members, presents a bypass restrictor extending towards an edge portion of a second one of the heat exchanger members, and the bypass restrictor forms an outer wall of the heat exchanger. A system having such an oil cooler and a method for cooling oil are also disclosed.

Abstract: A coil on tube heat exchanger is provided that uses multiple parallel helical coil tubes to limit liquid pressure losses while providing similar performance and production times to previous coil and tube designs. Two or more coil tubes are wrapped together around a center tube in a helical fashion, permitting the heat exchanger to be used in a counter-flow, or contra-flow, implementation. Use of the heat exchanger includes flowing a first liquid, such as waste water, through the center tube and flowing a second liquid through the plurality of channels. Embodiments of the present invention provide reduced pressure loss, higher performance and are generally faster to manufacture than prior heat exchangers.

Abstract: A cooler includes a plate, a cooling case having a coolant flowing therein, and a plurality of wavy fins having a raised curved portion and a lowered curved portion formed alternately on a side face in a flow direction of the coolant. In this cooler, the coolant flows through between the raised curved portion and the lowered curved portion opposite to each other in a meandering manner. The raised curved portion is provided with a bank creating a flow of coolant from the raised curved portion toward the opposite lowered curved portion. With this bank, a part of a main stream of the coolant can be mixed with the coolant stagnating near the lowered curved portion, whereby the heat transfer coefficient of the wavy fins can be improved. Thus, stagnation of the coolant near the lowered curved portion can be prevented, so that the cooler can have enhanced cooling performance.

Abstract: A header tank for a heat exchanger for supplying a heat exchange fluid to a core unit in which a plurality of tubes are provided side by side includes an inlet part for introducing the heat exchange fluid into the header tank, and a plurality of ribs projecting into the header tank, extending in directions intersecting with a central axis direction of the inlet part, arranged side by side in the central axis direction and configured to cause the heat exchange fluid to flow into the tubes. The plurality of ribs project more into the header tank with increasing distance from the inlet part.

Abstract: An organic substrate capable of providing effective heat transfer through its entire thickness by the use of parallel, linear common thermally conductive openings that extend through the substrate, the substrate having thin dielectric layers bonded together to form an integral substrate structure. The structure is adapted for assisting in providing cooling of high temperature electrical components on one side by effectively transferring heat from the components to a cooling structure positioned on an opposing side. Methods of making the substrate are also provided, as is an electrical assembly including the substrate, component and cooling structure.

Abstract: An auxiliary controller for an HVAC system includes a thermostat interface for receiving control signals by wire from a thermostat; an HVAC system interface for providing control signals by wire to an HVAC system; a security system interface for receiving armed status signals by wire from a security system; and processing structure configured to, while the security system is disarmed, permit routing of all control signals received from a thermostat to an HVAC system and, upon arming of the security system, invoke a setback mode including controlling the routing to reduce energy consumption.

Abstract: A cooling device comprises a cooling tube containing a working gas, a pressure oscillator connected to a first end of the cooling tube to generate a pressure oscillation and displacement of the working gas, and means for phase shifting the pressure oscillation relative to displacement of the working gas, connected to a second end of the cooling tube. The device further comprises a first sealed pressure transmission element to separate the working gas from a fluid contained in the phase shifting means. The fluid and the working gas are of different natures.

Abstract: A method of providing cooled air to electronic equipment includes capturing heated air from a volume containing electronic equipment, cooling the heated air by more than fifteen degrees Celsius in an air-to-water heat exchanger, and supplying cooling water to the air-to-water heat exchanger at a temperature above a dew point temperature of the heated air.

Abstract: A wellbore apparatus includes a connector sub assembly having a body, the body having a first end adapted to couple to a first perforating sub component and a second, axially opposed end adapted to couple to a second perforating sub component. The connector sub body defines a cavity proximate the second end of the connector sub body; and a flow path in fluid communication with the cavity and a location exterior to the wellbore apparatus. The apparatus includes a valve residing in the flow path and actuatable to block or allow fluid flow from the cavity, through the flow path, to the location exterior to the wellbore apparatus.

Abstract: An apparatus for use in deployment of downhole tools is disclosed. Preferably, the apparatus includes at least an in-ground well casing, a housing providing a hermetically sealed electronics compartment, a tool attachment portion, and a first flow through core. The housing is preferably configured for sliding communication with the well casing. The hermetically sealed electronics compartment secures a processor and a location sensing system, which communicates with the processor while interacting exclusively with features of the well casing to determine the location of the housing within the well casing. A preferred embodiment further includes a well plug affixed to the tool attachment portion, the well plug includes a second flow through core capped with a core plug with a core plug release mechanism, which upon activation provides separation between the second flow through core and the core plug, allowing material to flow through said first and second flow through cores.

Abstract: The present invention relates to a kick over tool (5) for manipulating and installing devices into and removing devices from a side pocket mandrel (2), where the kick over tool is designed to enable multiple operations in the same run. The kick over tool comprises a tubular carrier housing (6) adapted for passage through a full opening bore of a production string, at least a first and second setting device (8,9) that is arranged in said carrier housing, the first and second setting device being pivotally connected to a first and second articulated linkage mechanism (12,13) comprising a coupling device for the well bore device.

Abstract: The present invention provides for an apparatus for use with a traveling valve assembly of a downhole pump for releasing gas and thereby breaking gas locks. The apparatus comprises a piston slidably disposed within a cylindrical housing, the piston being driven by an attached plunger element. On the down stroke of the pump, the piston protrudes through end of the cylindrical housing engaging and opening the adjacent valve. On the up stroke of the pump, the piston retracts into the cylindrical housing, disengaging from the valve allowing it to close. Fluid flows along the outer surface of the apparatus by means of fluid ports connected by defined fluid passages.

Abstract: For handling and clamping a pipe, an apparatus includes plural clamping elements movably arranged in a device body configured as an annular shell. A positioning element is vertically movably arranged in the device body, and includes an obliquely sloping actuating surface that cooperates with a sliding surface of the clamping elements, so that a vertical or axial motion of the positioning element at least partially causes a horizontal or radial motion of the clamping elements. Also, a vertical or axial motion of the clamping elements is at least partially converted into a horizontal or radial motion thereof.

Abstract: The present disclosure is directed at a wellhead assembly that includes a casing head and a tubing head that is landed within the casing head when the tubing head is landed. The casing head has top and bottom ends, and its bottom end is coupled to surface casing. The tubing head also has top and bottom ends, and its bottom end is coupled to an additional casing string, such as production casing. The present disclosure also is directed at the tubing head itself, and at a method for landing the tubing head within the casing head. Beneficially, the present disclosure describes a method and apparatus by which the tubing head can be landed on the casing head through a blowout preventer, which can save time and reduce risk relative to conventional methods and apparatuses by which the blowout preventer is nippled-down prior to landing the tubing head.

Abstract: A packer arrangement for forming a seal between an inner tubular string and an outer tubular string in a borehole includes: an outer tubular string member defining an axial flowbore and having an associated packer setting mechanism; a packer device disposed at least partially within the outer tubular string member to form a seal against an inner tubular string, the packer device including a degradable layer for temporarily and at least partially protecting the packer device; an inner tubular string member to be disposed within the flowbore of the outer tubular string member; and an actuator carried on the inner tubular string member, the actuator being operable to actuate the packer setting mechanism to set the packer device against the inner tubular string.

Abstract: A well is drilled and casing installed utilizing a casing drilling technique. A bottom hole assembly having a drill bit and a fluid diverter is secured to a string of drill pipe and installed within a casing string. Drilling fluid is pumped down the drill pipe string to cause the drill bit to rotate and drill the well while the fluid diverter is in a drilling mode position. At the total depth for the casing string, the operator moves the fluid diverter to a cementing position and pumps cement down the drill pipe and up the casing string annulus. After cementing, the operator moves the fluid diverter to a packer set position and again pumps drilling fluid down the drill string to set the packer.

Abstract: An alert system for a downhole operation including a tubular string in a borehole. The tubular string having at least one sensor positioned in the borehole for measuring at least one parameter during operation of the tubular string. A unit in data communication with the tubular string and operatively arranged to enable an operator to obtain information regarding operation of the tubular string. A work area positioned proximate to the unit and operatively arranged to receive the operator when the operator is interfacing with the unit. A vibration module operatively arranged to vibrate the work area or a structure therein, wherein the vibration module is triggered in response to a first parameter being outside of a predetermined range set by a first threshold value. Also included is a method of alerting an operator during a drilling operation.

Abstract: The present invention relates to a system for measuring data in a well extending below surface, said system comprising a body having a longitudinal axis and a front end and a rear end; locomotion means; control means adapted to control direction and/or speed of the locomotion means; said control means being controllable from the surface. Thereby is achieved that a body may be remotely controlled from the surface e.g. the entrance of an oil well.

Abstract: A method for residual oil recovery from oil reservoirs, and diagnostic tests for determining its efficiency using a single well are described. The method includes injecting oil into a well in a reservoir that has been previously waterflooded or an oil reservoir or zone of an oil reservoir which contains immobile oil at the time of discovery, and extracting the oil by waterflooding the charged zones by placing the injection well in production. The target zone from which oil is recovered may be increased by following injection of oil with injection of water to push an oil bank which grows in volume as a function of distance of propagation, because of the effect of waterflooding on residual oil. The well may then be placed in production and the oil bank volume will continue to increase in volume as it returns to the well, again because of the waterflooding effect. The oil bank is then produced at the surface.

Abstract: A system and method for sampling fluid from a production wellsite are provided. The system includes an interface operatively connectable to the port and a separation circuit operatively connectable to the interface for establishing fluid communication therebetween. The separation circuit includes a pumping unit and at least one sample chamber. The pumping unit includes pumping chambers having a cylinder with a piston therein defining a fluid cavity and a buffer cavity. The fluid cavities define a separation chamber for receiving the fluid and allowing separation of the fluid therein into phases. The buffer cavities have a buffer fluid selectively movable therebetween whereby the fluid flows through the separation circuit at a controlled rate. The sample chamber is for collecting at least one sample of the phases of the fluid.

Abstract: A sampling apparatus, comprising a primary flowline, a secondary flowline, a dump flowline not provided down-stream of the secondary flowline, and a relief valve provided in the dump flowline, may be disposed in a wellbore penetrating a subterranean formation. A method of use of the sampling apparatus may comprise flowing fluid from the subterranean formation and into the primary flowline; diverting fluid from the primary flowline to a sample chamber through the secondary flowline; diverting fluid from the primary flowline to the wellbore through the dump flowline; and controlling the pressure in the sample chamber using the relief valve. The sampling apparatus may be used to terminate storage of a fluid sample in a sample chamber while continuing to pump fluid from the formation.

Abstract: A well completion and related method are provided for formations susceptible to simultaneous production of oil and water. In one embodiment, two closely spaced, preferably horizontal wellbores are drilled from a single well into the reservoir. The reservoir rock surrounding one leg (typically the upper leg) is chemically treated to make it hydrophobic, whereas the reservoir rock surrounding the other leg is chemically treated to make it hydrophilic. Separate production tubing and a dual completion is installed in order to enable independent flow from each leg. Drawdown pressures in both legs are controlled to be sufficiently close to each other such that only oil flows into one leg and only water into the other. The water produced is re-injected downhole or brought to the surface.

Abstract: Volatile organics in newly produced oil and gas, and/or condensates and distillates from produced oil and gas, are treated to depress vapor pressure to preserve light hydrocarbons in them when they are in storage vessels. The loss of volatile organics during storage of high gravity oil is minimized by forming a flowable or pumpable gel in the high gravity oil, (and/or condensates and distillates), as they are introduced to a storage vessel. The gel-former may comprise a phosphate ester of one or more low molecular weight alcohols, and a crosslinker including a source of iron or aluminum. Although the gels are flowable and pumpable, they can be broken for transportation from the production site or at another desirable time, returning the hydrocarbon product to its original properties.

Abstract: A process for the recovery of hydrocarbon such as bitumen/EHO from a hydrocarbon bearing formation in which are situated an upper injection well and a lower production well, the method comprising the steps: preheating an area around and between the wells by circulating hot solvent through the completed interval of each of the wells until sufficient hydraulic communication between both wells is achieved; injecting one of more hydrocarbon solvents into the upper injection well at or above critical temperature of the solvent or solvent mixture, thereby causing a mixture of hydrocarbon and solvent to flow by gravity drainage to the lower production well; and producing the hydrocarbon to the surface through the lower production well. A non-condensable gas may be injected into the solvent chamber created by the hydrocarbon solvent.

Abstract: Methods including providing a downhole tool or a component thereof comprising a plasticized polymer composition that comprises a polymer and a water-soluble plasticizer, wherein the plasticized polymer composition has a first deflection test value; exposing the downhole tool or the component thereof to an aqueous-based medium; allowing the water-soluble plasticizer to leach out of the downhole tool or the component thereof, wherein the plasticized polymer composition has a second deflection test value after exposure to the aqueous-based medium, and wherein the second deflection test value is less than about 10% of the first deflection test value; and placing the downhole tool or the component thereof in a subterranean formation.

Abstract: Composite particulates for use in high permeability subterranean formations may contain, at least, a gel particulate having a solid particulate incorporated. Some methods of using the diverting agent may include introducing a treatment fluid comprising a base fluid and a diverting agent into at least a portion of a subterranean formation and allowing the diverting agent to bridge fractures, provide fluid loss control, seal the rock surfaces for fluid diversion, or plug an area along the annulus of a wellbore.

Abstract: A method for carrying out in-situ bitumen extraction can include a step of forming one or more vertical freeze walls within or around a deposit of bituminous material and establishing a laterally confined deposit of bituminous material; a step of injecting a solvent within the laterally confined deposit of bituminous material; a step of withdrawing a mixture of dissolved bitumen and solvent from within the laterally confined deposit of bituminous material; a step of injecting water within the laterally confined deposit of bituminous material; and a step of withdrawing a mixture of solvent and water from within the laterally confined deposit of bituminous material.

Abstract: Proppant material for hydraulic fracturing is provided. The particles of the proppant are formed by drip casting. A slurry of finely divided ceramic particles is flowed through nozzles and formed into droplets under the influence of vibration. Uniform sized, smooth surface, spherical green particles are formed. The green particles are dried and sintered to form the proppant. The proppant is used in the process of hydraulic fracturing of wells.

Abstract: Pumpable process-fluid compositions comprise polyacrylamide, a non-metallic crosslinker and a pH-adjustment material. Such compositions have utility in the context of controlling lost circulation in subterranean wells. Upon entering at least one lost circulation zone, the compositions crosslink, thereby forming a barrier that minimizes or stops fluid flow from the wellbore into the lost circulation zone.

Abstract: A whipstock assembly allowing a lowside casing exit, the whipstock assembly includes a whipstock including an upstream portion and a downstream portion, the upstream portion having a deflection wedge surface and an opposite casing-side surface; and a fulcrum protruding from the whipstock and positioned between the downstream portion and the upstream portion. Also includes is a method of allowing a first side exit in a window milling operation of a casing having a first side and an opposite second side.