Abstract: An in-line drainer or liquid separator for draining liquid from a moving black liquor slurry stream having a screen basket mounted in the internal chamber of the in-line drainer. The screen basket includes slots to retain solid particles of the moving black liquor slurry stream within the black liquor slurry stream flow chamber and block the solid particles from entering the liquid collection chamber. The slots each have a curved corner edge adjacent a surface screen basket facing the black liquor slurry stream flow chamber.

Abstract: A method for producing a coated structural element for exterior applications in the door and gate industry, such as for a sectional gate panel, an overhead door, a door, or a structural element for a facade with an integrated gate and/or integrated door, in which a relative movement between a starting material designed for producing the structural element and a coating device is generated along a feed direction, and to a coating mass that is applied to the starting material by the coating device along a coating direction that runs transverse to the feed direction and preferably approximately perpendicular to the surface to be coated.

Abstract: There are provided an aluminum alloy casting free from crack-causing needle-shaped crystallized substances and an apparatus and a method for producing a slide member excellent in mechanical properties such as abrasion resistance. A melt of an iron-containing aluminum alloy poured into a vessel in the completely liquid state is vibrated by a vibrating needle of a vibration applying unit, and then a core is inserted into the melt to cool the melt, whereby the aluminum alloy casting is produced as a sleeve of a slide member. The vibrating step is carried out at a frequency of 20 to 1000 Hz, and is continued until just before the melt is cooled to the solid-liquid coexisting temperature region.

Abstract: The invention relates to a casting device for a piston for an internal combustion engine, having at least one at least mostly linearly displaceable sleeve for forming at least one piston pin bore and at least one slider that can be displaced at least mostly linearly and diagonally to the sleeve for forming at least one recess under a ring zone of the piston, characterized in that the sleeve and the slider are at least indirectly coupled, such that the sleeve at least partially carries the slider when displaced. The invention further relates to a method for opening and/or closing a casting device for a piston for an internal combustion engine, wherein that east one mostly linearly displaceable sleeve at least partially carriers at least one slider that can be displaced mostly linearly and diagonally to the sleeve.

Abstract: The present invention relates to methods of integrating one or more thermal processes with one another, wherein the thermal processes to be integrated have different supply and demand criteria for thermal energy. The method involves the use of one or more thermal stores.

Abstract: A heat exchanger with a thermal storage function includes a plurality of heat exchange tubes, a plurality of thermal storage material containers, and a first thermal storage material charging member. A circumferential wall of the first thermal storage material charging member is deformed such that a collapsed portion is formed on the first thermal storage material charging member and the thermal storage material charging passage is closed and sealed. The collapsed portion of the first thermal storage material charging member includes a first collapsed part and a second collapsed part. A relation T2<T1?2t is satisfied where “t” represents a thickness of the circumferential wall of an uncollapsed portion of the first thermal storage material charging member, “T1” represents a thickness of the first collapsed part, and “T2” represents a thickness of the second collapsed part.

Abstract: A container data center includes a container and an air collecting device. The air collecting device includes a collecting member, a first duct connected to the collecting member, and a second duct connected to the container. One end of the first duct opposite to the collecting member is pivotably connected to the second duct. The collecting member is rotatable to collect the airflow. The airflow flows through the first duct and the second duct to go into the container.

Abstract: A system and associated method is disclosed for manipulation and control of air temperature in sport field and associated environments, wherein geothermally and/or mechanically cooled source air is distributed, via one or more air handling unit or air handling component, to the requisite environment through one or more pipes and a plurality of associated, uniquely configured, supply air nozzles. Such system and associated method of use and application solves, or dramatically reduces, the problem of elevated playing surface and/or elevated player envelope environmental temperatures.

Abstract: A thermal management system according to an exemplary aspect of the present disclosure includes, among other things, a first fluid circuit that selectively communicates a first portion of a first conditioned fluid having a first temperature to a first gas turbine engine system and a second portion of the first conditioned fluid having a second temperature to a second gas turbine engine system. The second temperature is a greater temperature than the first temperature. A second fluid circuit circulates a second conditioned fluid that is different from the first conditioned fluid to a third gas turbine engine system.

Abstract: A heat dissipating apparatus includes an enclosure, a supporting frame attached in the enclosure, and a heat exchanger. The enclosure includes two opposite side plates, each of which defines at least one guiding groove. The heat exchanger is mounted to the supporting frame. The heat exchanger includes two opposite sidewalls and at least one positioning post protruding from each of the two sidewalls. Each of the at least one positioning posts is slidably received in, positioned by, and held captive in, one of the at least one guiding grooves.

Abstract: A heat exchanger includes a single refrigerant pipe (44) for introducing a refrigerant into a receiver tank (14) from a condenser header part (20, 26), and a mounting member (40) for mounting the receiver tank to a core (10). The mounting member has a refrigerant inlet passage (56) connecting the refrigerant pipe to the interior of the receiver tank, and a refrigerant outlet passage (58) connecting the interior of the receiver tank to a sub-cooler header part (22, 28).

Abstract: The radiator shutter provided for the frontal arrangement at a motor vehicle shows two groups of lamellae (2-4, 5-7), which are pivotally supported at opposite sides of a drive unit (68), each parallel in reference to a shutter frame (9). For a joint pivoting of the lamellae (2-7) an entrainer tappet (99-104) provided here at a distance from its bearing axis (109) in the direction perpendicular in reference to the longitudinal direction of the lamellae, engages a common coupling element (98). For a simple production of the engagement of the bearing tappets of the lamellae in the shutter frame (9) and its entrainer tappets (99-104) in the coupling element (98) they are latched in bearing recesses (32-37) open perpendicular in reference to the bearing axis.

Abstract: The present disclosure provides for a heat exchanger. The heat exchanger generally comprises a duct and substantially parallel tubes having an outer wall and arranged in the duct to define gaps therebetween. An air flow is directed through the duct to deliver heat through the gaps and over the outer walls of the tubes. A second means directs an air flow that receives heat through the tubes. The air flow that delivers heat generally comprises air that is moist, saturated, or near its saturation curve. The heat exchanger also comprises collecting means arranged in the duct for collecting the condensate flowing along the outer walls of the tubes upon exiting from the duct at the outlet.

Abstract: The invention is directed to an arrangement of two conduits, wherein the conduits are positioned parallel with respect to each other and wherein each conduit is provided with means suitable to remove solids from its surface and positioned along the length of one of the two sides of the conduit, wherein the means are one or more pairs of oppositely oriented nozzles, each nozzle having an outflow opening for gas directed, along the surface of the conduit, towards the outflow opening of the other nozzle of said pair, wherein the pairs of oppositely oriented nozzles of one conduit are arranged in a staggered configuration relative to the pairs of oppositely oriented nozzles of the other conduit.

Abstract: A liquid-cooled-type cooling device includes a casing having a top wall, a bottom wall, and a cooling-liquid passage, and a radiating member disposed in the cooling-liquid passage. The radiating member has a substrate and a plurality of pin-shaped fins. Longitudinally intermediate portions of the pin-shaped fins are brazed to the substrate. The substrate has a plurality of fin insertion holes, and the pin-shaped fins are inserted into the fin insertion holes of the substrate. A plurality of convex portions are integrally formed on the longitudinally intermediate portion of each pin-shaped fin. The substrate and the pin-shaped fins are provisionally fixed together by plastically deforming the convex portions such that they are crushed. In this state, the substrate and the pin-shaped fins are brazed together. The upper and lower end portions of the pin-shaped fins are brazed to the top wall and bottom wall, respectively, of the casing.

Abstract: A heat exchanger includes an air channel configured to receive air from an equipment rack. A fluid circuit is provided having a bi-phase coolant flowing therethrough. The fluid circuit includes a coolant channel coupled to the equipment rack and positioned adjacent to the air channel. The bi-phase coolant is part liquid and part gas as the bi-phase coolant flows through the coolant channel. The bi-phase coolant is configured to condition the air flowing through the air channel.

Abstract: A temperature control device includes a heat pipe including a heat absorption part provided at one end side and absorbing heat from an outside and a heat dissipation part provided at another end side and dissipating heat to the outside, and a heat absorption plate and a heat dissipation plate (heat conducting plates) made of metal films formed by powder including metal being accelerated with a gas toward at least one of external surfaces of the heat absorption part and the heat dissipation part of the heat pipe and being sprayed and deposited on the surfaces in a solid-phase state.

Abstract: The present invention relates to a dual-loop circulation cooling system for an oven of a liquid crystal manufacture process, including a water pump, a water tank, a water drawing pipe, a water returning pipe, and a first cooling pipe and a second cooling pipe. The water pump, the water tank, the water drawing pipe, and the water returning pipe are arranged outside the oven. The first cooling pipe and the second cooling pipe are two juxtaposed cooling pipes that are arranged substantially parallel inside the oven. The water pump drives coolant contained in the water tank through the water drawing pipe into the first cooling pipe and the second cooling pipe inside the oven, whereby the coolant removes heat from the oven and then returns through the water returning pipe back into the water tank. The coolant flows in the first cooling pipe and the second cooling pipe in opposite directions.

Abstract: A cooling reservoir may be provided. The cooling reservoir may include: a generally polygon shaped container having sides that define at least two corners; a fan configured to blow air across two sides that define one of the corners; and cooling fins attached to the sides. A method for making a cooling reservoir may be provided. The method may include: providing generally polygon shaped container having sides that define at least two corners; mounting a fan to blow air across two sides that define one of the corners; and attaching cooling fins to the sides.

Abstract: The invention relates to a heat exchanger for the exchange of heat between first and second fluids. The heat exchanger includes first circulation canals for the circulation of the first fluid in a first direction of circulation (D1), and second circulation canals for the circulation of the second fluid, and perturbation walls arranged in the second circulation canals for the second fluid and having perturbators that perturb the flow of the second fluid. The perturbation walls respectively have at least one dividing rib. The at least one rib extends in a second direction (D2) substantially perpendicular to the first direction in which the first fluid circulates, and over a predefined distance of the wall that is less than the total width of the wall in the second direction, so as to define at least two circulation passes for the second fluid substantially perpendicular to the circulation of the first fluid.

Abstract: An air conditioner includes a main unit having an enclosure defining an air outlet. The enclosure contains a heat exchanger generating a cool air or a warm air forming airflow running out of the air outlet. A pair of fan units are disposed on the opposite sides of the air outlet. The fan units are configured to suck a room air and to blow the room air. The airflow of the room air can be utilized to control the direction and/or movement of the airflow of the cool air or the warm air. The cool air or the warm air can be conveyed to desired locations.

Abstract: An air conditioner includes a main unit having an enclosure defining an air outlet. The enclosure contains a heat exchanger generating a cool air or a warm air forming airflow running out of the air outlet. A pair of fan units are disposed on the opposite sides of the air outlet. The fan units are configured to suck a room air and to blow the room air. The heat exchanger includes a rear section having a length larger than that of a front section in the longitudinal direction of the air outlet. The rear section extends into at least one of spaces respectively defined behind the fan units.

Abstract: A plate heat exchanger comprising a set of heat exchanger plates arranged between a frame plate and a pressure plate. A guide bar guides the set of heat exchanger plates and the pressure plate relatively the frame plate, a tightening member is arranged on the guide bar and a plate engager is arranged intermediate the tightening member and the pressure plate for allowing the tightening member to press the pressure plate in a direction towards the frame plate. The plate engager is releasable and the tightening member is configured to protect the guide bar, such that the pressure plate may move in a direction from the frame plate and past the tightening member when the plate engager is released. A related method is also described.

Abstract: A heat exchanger assembly comprises a heat exchanger for heat exchange between at least a first heat exchange fluid and a second heat exchange fluid. The heat exchanger comprises at least one heat transfer element delimiting a first fluid path from a second fluid path, and a through connection for the first heat exchange fluid arranged at a first side portion of an outer structure of the heat exchanger. The assembly comprises a pressure pulse damping apparatus comprising an elastic element, and a first conduit leading to the elastic element. The first conduit comprises a first opening connected to the through connection of the heat exchanger such that the first conduit is fluidly connected with the first fluid path. The elastic element fluidly communicates with the first fluid path only via the first opening. There is further disclosed use of a pressure pulse damping apparatus comprising an elastic element.

Abstract: Provided is a heat exchanger, which includes a plurality of flat tubes in which refrigerant flows, a fin including tube couplers in which the flat tubes are inserted, wherein the refrigerant exchanges heat with a fluid through the fin, and a header coupled to at least one side portion of the flat tubes and distributing the refrigerant to the flat tubes. The fin includes a first fin coupled to a part of the flat tubes, the part of the flat tubes constituting a first row, and a second fin provided on a side portion of the first fin and coupled to another part of the flat tubes, the another part of the flat tubes constituting a second row.

Abstract: A refrigerant radiator for a heat pump cycle includes a plurality of tubes. The tubes are disposed to satisfy the following relationship: Re?A×X6+?B×X5+C×X4+D×X3+E×X2+F×X+?G wherein ? is an inclination angle formed by a flow direction of the refrigerant flowing through the tubes and the horizontal direction; X is a dryness of the refrigerant in a predetermined position; and Re is a Reynolds number of the refrigerant in the predetermined position determined from an average flow velocity of the refrigerant flowing through the tube. The A to G are expressed by a function of ?, which suppresses the non-uniform loss in pressure of the refrigerant in the respective tubes to reduce the difference in temperature of blown air in the refrigerant radiator.

Abstract: A heat exchanger has a plurality of flat tubes, and a plurality of fins in which the flat tubes are inserted in an orthogonal direction. Each of the fins includes a fin body, and an attachment portion to which the flat tube is attached. The fin body includes an insertion region in which the flat tube is inserted, and an extension region on the downwind side of the insertion region. A spacer configured to keep a space between the fins is formed in each of the insertion region and the extension region by cutting and bending part of the fin. The spacer of the extension region is straight behind the spacer of the insertion region on the downwind side. The spacer of the insertion region is configured such that the spacer body is tilted with respect to an airflow.

Abstract: A first fan controlling section of a controller circuit is configured to control a first blower fan so as to induce the discharge of the airflow of a cool air through a first air outlet defined in a first enclosure of an indoor unit of the air conditioner. A second fan controlling section is configured to control second blower fans so as to induce the discharge of the airflows of a room air through second air outlets, respectively, defined in a pair of second enclosures disposed on the opposite sides of the first enclosure. An enclosure attitude controlling section is configured to change the respective attitude of the second enclosures relative to the first enclosure.

Abstract: A control method for fan includes the following steps: a temperature value for a heat element is detected by a heat detecting unit, and the temperature value is transmitted to an infrastructure management module; a fan input control signal is calculated according to the temperature value; the fan input control signal is transmitted to a fan board through the heat detecting unit; an input speed information is input to the fan for dissipating the heat element by the fan board according to the fan input control signal; an output speed information of the fan is received; and determining whether the fan works as predefined by the fan board according to the output speed information and the input speed information.

Abstract: A combine cooling control system that includes at least one cooler for exchanging heat from a medium flowing through at least one combine system and the at least one cooler and at least one fan having at least one rotatable blade for generating airflow. The control system also includes at least one movable air director in proximity to the at least one cooler for controlling the airflow. The control system further includes a controller configured to receive at least one sensed operating condition from at least one operating condition sensor and determine one or more of a desired state for the at least one moveable air director and a desired speed of the at least one fan based on the received at least one operating condition. The control system further includes at least one an actuation device configured to move the at least one movable air director.

Abstract: Systems for cooling turbine components via fluid filled conduits are disclosed. Various embodiments include a system having: a set of fan systems for cooling a set of conduits, the set of conduits fluidly connected with a turbine component; a temperature sensor operably connected to the turbine component, the temperature sensor for obtaining a temperature indicator of the turbine component; and a control system operably connected to the set of fan systems and the temperature sensor, the control system for modifying a speed of at least one fan system in the set of fan systems across a range of speeds in response to determining the temperature indicator deviates from a predetermined range of temperature values.

Abstract: Certain aspects and embodiments of the present invention are directed a sand control device cleaning system that can be disposed in a wellbore through a fluid-producing formation. The sand control device cleaning system can include a housing and a fluid communication structure. The housing can be coupled to a section of a tubing string of a well system. A portion of the housing or a container disposed within the housing can store a dissolving material. A dissolving fluid that can dissolve or otherwise remove particulate material can be formed from the dissolving material. The fluid communication structure can communicate the dissolving fluid from the housing to a sand control device coupled to the section of the tubing string.

Abstract: An integrated fluid filtration and recirculation system and method are provided for re-circulating and filtering fluid that is used in well cleaning operations. The system is incorporated within an enclosure, which is transportable, such as on a vehicle trailer. The system has power generation capability, thereby making the system capable of operating as a stand-alone unit. Chemicals may be infused into the filtered fluid from an integral chemical supply allowing the system to also function as a treatment facility for the fluid. The components of the system are arranged in a linear fashion that enables the system to maintain a minimum profile for transport upon a conventional trailer, yet the system provides enough room within the enclosure to allow operators to repair/inspect each of the system components. The enclosure may be climate controlled, and the enclosure may include removable panels for operation of the system in temperate conditions when climate control is unnecessary.

Abstract: A gas separator connectable to a pump for flowing production fluid, the separator having a housing defining an internal cavity with an inlet end defining for the production fluid. A housing first pumping stage pressurizes the production fluid, and a first fluid flow restrictor downstream of the first pumping stage limits the production fluid to a selected first flow rate. A first separation chamber in the housing downstream of the first fluid flow restrictor separates some gas from the production fluid, and a housing second pumping stage further pressurizes the production. A second fluid flow restrictor downstream of the second pumping stage limits the production fluid flow to a selected second flow rate, and a second separation chamber downstream to the second fluid flow restrictor effects further gas separation from the production fluid.

Abstract: A downhole circulating valve includes a generally tubular outer housing having a generally axially extending internal passageway. At least one generally longitudinally extending circulating passageway is formed through at least a portion of the housing. At least one exterior port and at least one interior port are in fluid communication with the circulating passageway. At least one seal plug is disposed within the circulating passageway. The seal plug has a first position relative to the housing wherein the seal plug is remote from the exterior port and the interior port, thereby allowing fluid flow between the exterior port and the interior port through the circulating passageway. The seal plug has a second position relative to the housing wherein the seal plug is between the exterior port and the interior port and wherein the seal plug forms at least one metal-to-metal seal with the circulating passageway, thereby preventing fluid flow between the exterior port and the interior port.

Abstract: A dissolvable tool includes, a body with a surface having at least one perforation therethrough, the at least one perforation being dimensioned to control a rate of intrusion of an environment reactive with at least a portion of the dissolvable tool located below the surface.

Abstract: A downhole setting tool comprises a tool housing and a hollow mandrel, the mandrel being situated in the housing. The tool further comprises a piston situated between the mandrel and the tool housing and a collar situated between the mandrel and the tool housing, wherein the tool housing, the mandrel, the piston and the collar define an annulus. The tool further comprises a first valve, wherein in a closed position the first valve blocks a path of fluid communication between the interior of the mandrel and the annulus.

Abstract: Degeneration of shale caused by oxygen in aqueous drilling, fracturing and completion fluids is minimized by introducing imidazolines modified so that they will be attracted efficiently to pyrites in the shale, thereby forming a protective coating on the pyrites. Inhibiting oxidation of the pyrites sharply reduces physical degradation of the shale, and the generation of undesirable oxides, in the presence of drilling, fracturing and completion fluids carrying oxygen. The imidazoline is an ionic salt of a monocarboxylic acid.

Abstract: A downhole tool for moving fluid through the tool comprises a rotatable sleeve disposed within a bore of the tool. The sleeve includes an opened upper end and a closed lower end to define a cavity. A fluid movement profile is disposed along the lower end. A directional port is disposed in the side of the sleeve in fluid communication with the cavity and an upper port disposed in the tool. The upper port can be isolated from a lower port in the tool, the lower port being in fluid communication with the fluid movement profile. A first fluid flowing downward enters the cavity, exits the directional port causing rotation of the sleeve, and flows out the tool through the upper port. Sleeve rotation causes a second fluid to be drawn upward into contact with the fluid movement profile which directs the second fluid out of the lower port.

Abstract: A system for heating a hydrocarbon resource in a subterranean formation having a wellbore extending therein is provided. The system includes a radio frequency (RF) source, an RF antenna to be positioned within the wellbore, and a transformer to be positioned in the wellbore and configured to couple the RF source to the RF antenna so that the RF antenna supplies RF power to the hydrocarbon resource in the subterranean formation.

Abstract: A system for heating a hydrocarbon resource in a subterranean formation having a wellbore extending therein is provided. The system includes a radio frequency (RF) source, an RF antenna to be positioned within the wellbore, and a magnetic amplifier to be positioned in the wellbore and configured to couple the RF source to the RF antenna so that the RF antenna supplies RF power to the hydrocarbon resource in the subterranean formation.

Abstract: The present invention is directed to methods for assessing flow-induced electrostatic energy in an oil and/or gas well wherein electric current or electrostatic potential or both are measured to produce data correlating to at least one flow characteristic of a tubular segment in the well. In some embodiments, electric current and electrostatic potential are produced separately for a plurality of segments, and measured. The system further may adjust at least one flow characteristic of a segment of the well to increase hydrocarbon production from the well.

Abstract: Disclosed are systems and method for servicing a wellbore and otherwise triggering a downhole tool. One method includes arranging an assembly within a lubricator coupled to a tree. The assembly includes at least one downhole tool and a signal receiver subassembly. A signal is communicated to the signal receiver subassembly before the assembly is introduced into the wellbore, the signal being configured to activate a timer. The assembly is then introduced into the wellbore and advanced until reaching a target depth. At the target depth, a trigger signal is transmitted to the at least one downhole tool using the signal receiver subassembly, the trigger signal being configured to initiate actuation of the at least one downhole tool.

Abstract: An apparatus including a first actuator including a first housing defining a first internal region, a first head disposed in the first internal region, the first head defining first and second portions of the first internal region, and a first elongated member connected to the first head and extending out of the first housing. The apparatus further includes a first arm connected to the first elongated member to transfer to the first elongated member at least a first portion of a first force applied in a first direction by at least the weight of at least a tubular component, and a first pressurized fluid source in fluid communication with the first portion of the first internal region to apply a second force against the first head in a second direction that is opposite the first direction. According to one aspect, the tubular component is part of a quill.

Abstract: A system for determining a depth in a wellbore of a reference point associated with a coiled tubing. The system comprises a sensor coupled to a coiled tubing spool, wherein the sensor coupled to the coiled tubing spool is configured to determine an angular position of the spool, a processor coupled to the sensor, a memory coupled to the processor, and an application stored in the memory that, when executed by the processor, determines the depth in the wellbore of the reference point of the coiled tubing based on an input from the sensor coupled to the coiled tubing spool.

Abstract: A SAGDOX satellite system for recovering hydrocarbons includes a central SAGDOX site, at least one SAGDOX satellite site, and a pipeline corridor for communication between the central SAGDOX site and the SAGDOX satellite site. The satellite system is designed to recover hydrocarbons using a SAGDOX process at the satellite site and transfer recovered hydrocarbons to the central site.

Abstract: A method of providing an annular seal around a tubular in a wellbore penetrating a subsurface formation, the method comprising providing a tubular in the wellbore, wherein an annular space (18) is formed around the tubular; providing an annular gravel pack in the annular space; wherein the method further comprises arranging a band (9a, 9b, 9c, 9d) of gel-forming material around the tubular before providing the annular gravel pack, wherein the gel-forming material is swellable in a selected fluid, and wherein the annular seal is formed by contacting the band of gel-forming material with the selected fluid; and a wellbore system comprising a gravel-packed tubular in a wellbore, wherein the tubular is provided with a band of gel-forming material in a layer around the tubular, the band being surrounded by gravel (15), and wherein the gel-forming material is swellable in a selected fluid.

Abstract: Generally, methods for propping complex fracture networks in tight subterranean formations may involve introducing a first treatment fluid comprising a first base fluid and a first propping agent having a mean particulate size distribution ranging from about 0.5 microns to about 20 microns into a fracture network in a subterranean formation; and then introducing a second treatment fluid comprising a second base fluid and a second propping agent having a mean particulate size distribution greater than about 35 microns into the fracture network.

Abstract: The invention relates to a method of generating a network of fractures in a rock formation for extraction of hydrocarbon or other resource from the formation. The method includes the steps of i) enhancing a network of natural fractures and incipient fractures within the formation by injecting a non-slurry aqueous solution into the well under conditions suitable for promoting dilation, shearing and/or hydraulic communication of the natural fractures, and subsequently ii) inducing a large-fracture network that is in hydraulic communication with the enhanced natural fracture network by injecting a plurality of slurries comprising a carrying fluid and sequentially larger-grained granular proppants into said well in a series of injection episodes.

Abstract: According to an embodiment, a composition is provided that can be used in a cementing. The composition includes at least: (i) a hydraulic cement; and (ii) a copolymer comprising at least the monomeric units (a) through (d) of the following formula: wherein the monomeric units (a) through (d) can be any sequence and any proportion in the copolymer. With water, the composition of the hydraulic cement and such a copolymer becomes a cement composition. According to the method, the cement composition is introduced into a well and allowed to set in the well.