Abstract: A system (SPARC) for producing a mixed gas-oil stream wherein gas is to be separated and compressed downhole in a turbine-driven compressor before the gas is injected into a subterranean formation. A turbine bypass valve allows all of the stream to bypass the turbine during start-up until surging in the production stream has subsided. The valve then opens to allow a portion of the stream to pass through the turbine. Also, a compressor recycle valve recycles the compressor output until the surging in the stream has subsided while a check valve prevents back flow into the outlet of the compressor.

Abstract: A system for separating gas from a produced fluid. The system comprises a bottom intake completion utilized in a subterranean location. The system utilizes a gas handling system that separates a gaseous component from a fluid. The gas is vented to a separate flow path, while the fluid having a lower gas content is produced to a desired location.

Abstract: A method of producing gas from an underground formation, which is penetrated by a production well to surface, the method including allowing formation fluid comprising gas and liquid to flow into the production well at a production interval; allowing the formation fluid to separate into a gaseous component and a liquid component; producing the gaseous component through the production well to the surface; accumulating the liquid component in the production well so as to form a liquid column having, at a drainage interval of the production well, a pressure exceeding the pressure in the surrounding formation; and allowing liquid from the liquid column at the drainage interval to drain away into the surrounding formation, comprising treating the wall of the production well at the drainage interval and/or treating the formation surrounding the drainage interval so as to increase the flow rate of liquid into the surrounding formation.

Abstract: Methods and arrangements for production of petroleum products from a subsea well. The methods comprise control of a downhole separator, supplying power fluid to a downhole turbine/pump hydraulic converter, performing pigging of a subsea manifold, providing gas lift and performing three phase downhole separation. Arrangement for performing the methods are also described.

Abstract: Well equipment well fluid more efficiently from a gassy well. A conduit is hung and sealed inside a string of casing, forcing the gas and well fluid to flow into the conduit. A gas separator and a series of flow controls and valves are mounted into and run with the conduit. A pump assembly is hung and sealed into the conduit for pumping well fluid to the surface. The pump assembly is lowered and retrieved from the conduit on tubing. The pump may be located below the motor, or above the motor.

Abstract: The invention generally concerns a submersible well pumping system comprising an axially elongated housing having a diameter less than the bore hole of the well, a multi-chamber hydraulically driven diaphragm pump, suspended in the well. The pump is driven by a self-contained, closed hydraulic system, activated by an electric or hydraulic motor. The flow of working fluid into and out of the working fluid sub-chambers is controlled by a two state main valve with a means to insure the main valve is completely switched, in turn controlled by a control valve which senses the differential pressure across the working diaphragm and generates a hydraulic signal to change the state of the two state main valve, typically when either diaphragm reaches the top of the pumping stroke. Singly or in combination, the means to assure the main valve is completely switched between the two states is an energy storage device, hysterisis in the control valves and or a two position latch the main valve.

Abstract: A dual displacement pumping system is disclosed. In one embodiment, the system includes a subsurface pump, a tubing string, and a surface pumping unit connected to the subsurface pump by a reciprocating member. The subsurface pump includes a pump barrel mounted to the end of the tubing string, and a plunger mounted to the end of the reciprocating member. Valves cause downward motion of the plunger in the pump barrel to force fluid from the lower end of the pump barrel into the reciprocating member, and fill the upper end of the pump barrel with well bore fluid. They also cause upward motion of the plunger to force fluid from the upper pump barrel into the tubing string, and fill the lower pump barrel with well bore fluid. Thus, both pumping movements are exploited, nearly doubling the volume of fluid pumped with a conventional surface configuration.

Abstract: A gas dissipation chamber, installed between the tubing crossover and the production tubing string, for a through tubing conveyed ESP pumping system prevents gas discharged from the gas separator from entering the pump intake and subsequently gas locking the pumping system. The gas dissipation chamber secures to a lower end of production tubing. An electrical motor assembly is suspended on the lower end of the chamber. The gas separator and the pump are lowered through the tubing and land in the chamber in operative engagement with the motor assembly. Well fluid flows into the chamber to the separator, and gas separated by the separator vents out of the chamber into the casing. Liquid separated from the well fluid by the separator is pumped by the pump into the production tubing.

Abstract: A system for unloading fluids from a generally upright tubular member of a wellbore wherein a combustible fuel cell can be placed in the tubular member below the fluid and ignited to generate gasses. The gasses generated by the burning of the fuel cell can be used to force at least a portion of the fluid upward out of the tubular member.

Abstract: An intake assembly for a well pump restricts gas entry into the pump when the pump is located in a horizontal section of the well bore. The restrictor is located within a tubular intake housing. The intake housing has apertures for receiving the flow of well fluid. The apertures are spaced circumferentially around the housing. Once installed in the well, some of the apertures will be at higher elevations than others. The restrictor partially blocks at least one of the higher elevation apertures and opens at least one of the lower elevation apertures. The gas will be at the higher elevations, thus it is restricted from flowing in through the higher elevation aperture while the liquid freely flows into the lower elevation aperture. The restrictor may be of a buoyant material to float upward in the well fluid. The restrictor may also be open in response to contact with the casing wall.

Abstract: This relates to a gas separator (8) of the cascade type, with stratified or non-stratified flow, equipped with automatic level control to perform a process of the gravitational separation of two immiscible fluids of different densities, particularly to separate the gaseous phase from a two-phase mixture (liquid and gas). It is installed at the bottom of an oil well, upstream from a lifting pump (12) in order to minimize the entry of gas into pump (12). The level control system comprises a valve (29), a spring (30) and a packer (26). It is based on the combined effects of the abovementioned components (26, 29, 30), the gas pressure on the region of perforated casing (10) and the thrust exerted on a settling vessel (3) by the liquid on which it floats. The separator according to the invention has a control system for the level of the liquid stored in settling vessel (3) mounted within its separator (8), ensuring flow of the mixture which is ideal for the occurrence of gas separation.

Abstract: The invention generally concerns an arrangement of a low volume submersible pump connected to a downhole gravity type oil-water separator. The low volume submersible pump is electrically powered using a flexible electrical cable that connects between the pump and electric power located at the ground surface. The low volume submersible pump is typically a positive displacement pump such as a piston pump or a hydraulically driven diaphragm pump but could be a centrifugal pump if the volumes produced are compatible with this method. The separator is located above or below the pump and is defined by an enclosed, pressure-tight volume created by a separate container or by two or three downhole packers. Located in the separator is a control valve that regulates the flow of oil and water from the separator to discharge tubes connected to the surface or to additional downhole apparatus.

Abstract: A packer is disposed within a wellbore casing. The packer defines a first and a second zone of the wellbore. A submersible pumping system is used to displace liquid from the first zone of the wellbore via a first fluid flow path. A cable is used for supplying power to the submersible pumping system. The cable extends through tubing that extends from a surface location. A second fluid flow path extends from the first zone of the wellbore to a surface location. A portion of the second fluid flow path extends through the tubing.

Abstract: A system is provided for unloading accumulated liquids and enhancing the recovery of gas from a reservoir having diminished pressure. An annulus between a tubing string and casing is isolated by a packer and continually pressurized with a slipstream of compressed gas while the well continues to produce. A unique valve positioned in the tubing string is shuttled between a production position in which production fluids are permitted to bypass the valve to the surface and a lift position in which the bypass is blocked and an unloading port is opened to vent high pressure annulus gas to the tubing string above the valve, lifting accumulated liquids with it. Preferably, the valve is actuated to the lift position by the impact of a plunger dropped from a lubricator at the wellhead, when the pressure in the annulus has reached a predetermined threshold.

Abstract: The invention is a method and system of separating a multi-component fluid in a wellbore. At least one fluid separation membrane comprising a feed side and a permeate side is incorporated in the wellbore. A flowing stream of the multi-component fluid obtained from a subterranean zone being in fluid communication with the wellbore is passed across the feed side of the membrane at a first pressure. A retentate stream depleted in at least one component compared to the multi-component fluid is withdrawn from the feed side of the membrane and passed to the earth's surface. A permeate stream at a second pressure is withdrawn from the permeate side, in which the permeate stream is enriched in at least one component compared with the multi-component fluid. The second pressure is controlled to maintain the second pressure below the first pressure.

Abstract: A method and system for the downhole separation of a water and oil mixture and disposal of separated water utilizing a hydrostatic pressure head is disclosed. A separator apparatus is located in a wellbore at a depth substantially above a water disposal formation. A mixture of oil and water is received from an oil producing formation and delivered to the separator apparatus. The oil and water mixture is separated into separated water and separated oil by the separator apparatus. The separated oil is delivered to the well surface. The separated water is discharged from the separator apparatus into the wellbore creating a column of water above the water disposal formation. The hydrostatic pressure created by the column of water is ideally sufficient to cause the separated water to dissipate into the water disposal formation.

Abstract: A method and system for producing a mixed gas-oil stream wherein at least a portion of the gas is separated downhole by an auger separator which is comprised of an upstream and a downstream section. As the mixed stream flows through a converging passageway in the upstream section and gas is separated by an auger, the velocity of the stream is increased thereby reducing the temperature and pressure of the stream. This allows more of the condensate to remain with the liquids and not be separated with the gas. The liquids exit the upstream section and are produced to the surface. The separated gas flows through a diverging passageway in the downstream section where a port ion of the reduced pressure is regained before the gas either produced to the surface or compressed for downhole injection.

Abstract: A method and system for producing a mixed gas-oil stream wherein at least a portion of the gas is separated downhole by an auger separator which is comprised of an upstream and a downstream section. As the mixed stream flows through a converging passageway in the upstream section and gas is separated by an auger, the velocity of the stream is increased thereby reducing the temperature and pressure of the stream. This allows more of the condensate to remain with the liquids and not be separated with the gas. The liquids exit the upstream section and are produced to the surface. The separated gas flows through a diverging passageway in the downstream section where a portion of the reduced pressure is regained before the gas either produced to the surface or compressed for downhole injection.

Abstract: This is a high-efficiency item of equipment, for example for a well bottom for separating out gas from a liquid/gas mixture, based on the effects of flows of the cascade and segregated types. It consists basically of a sedimentation vessel whose lateral surface has holes in the upper portion, enclosing (i) a discharge pump, (ii) a suction pipe and (iii) the lower end of a production tubing. The vessel contains helicoidal surfaces for achieving segregated-type flow. A significant part of separation takes place above the level of the separator, in a medium in which there is a predominance of gas and the flow is in the form of a cascade.

Abstract: The present invention provides a clean water separation system with an electric submersible pumping device and a surface separator and pumping device for the separation and transfer of different density fluids and solids. The electric submersible pumping device can be an encapsulated device that works in conjunction with a separator and pumping system that are located on the surface, to separate fluids and solids.

Abstract: A system for separating gas from a produced fluid. The system comprises a bottom intake completion utilized in a subterranean location. The system utilizes a gas handling system that separates a gaseous component from a fluid. The gas is vented to a separate flow path, while the fluid having a lower gas content is produced to a desired location.

Abstract: This invention relates to a separator for the bottom of an oil production well with a channel for the escape of gas which has the function of providing a free path for the flow of gas which might be trapped in the separating channel due to possible flooding in the region of the separation inlet.

Abstract: A process for the recovery of energy from a pressurised well stream containing a gas/liquid mixture, the process comprising: treating the well stream to a pre-separation process to separate it into gaseous and liquid phases, selecting appropriate proportions of said separated gaseous and liquid phases, recombining said selected proportions, and supplying the recombined mixture to the inlet of a rotary separation turbine, wherein said components are separated and energy is recovered from the flow by rotation of the turbine, said proportions of said gaseous and liquid phases being selected to produce an optimum mixture for supply to the rotary separation turbine.

Abstract: A method and a system for producing fluids, particularly hydrocarbons and water, from a subterranean well are provided. The method and system can be used with a well in which the production zone is above the injection zone, or with a well in which the production zone is below the injection zone. The method includes the step of separating a well fluid into a hydrocarbon stream and a separate water stream, while simultaneously injecting a chemical into a selected zone of the well. The system includes a downhole separation system for performing the separating step, and a chemical injection system for performing the injecting step.

Abstract: An apparatus and method for separating gas and solids from well fluids in a borehole including a gas-solids separator (34) having an outer tubular member (44) and an inner flow tube (46). A gas spiral housing (62) has a gas spiral (66) at its lower end positioned beneath a plurality of perforations (60) in tubular member (44). A solid spiral (70) is positioned below upper gas spiral (66) and a swirl chamber (71) is provided between gas spiral (66) and solids spiral (70). Gas separated by gas spiral (66) flows upwardly in inner gas annulus (72) to gas reservoir (74) for discharge by ball check valve (76). The solids are separated by solids spiral (70) and the clean liquid after the gas and solids have been separated flows upwardly in flow tube (46) and pipe string (14) from lower swirl chamber (80). An embodiment shown in FIG. 5 provides a shroud (27A) about a downhole motor (20A) to effect cooling of motor (20A).

Abstract: In accordance with the present invention, a downhole separation tool is provided which utilizes a downhole separation chamber with a series of fluid regulators responsive to a formation fluid and constituent components for separate desirable formation yields from the less desirable yields prior to lifting the fluids to the surface. The separation chamber has an input for the formation fluid, a production output, and a disposal output, in a tree arrangement according to the density order of the fluids in the separation chamber. The input flow regulator is coupled to the separation chamber input, the production regulator is coupled to the production output, and the disposal regulator is coupled to the disposal output. Each of the regulators are responsive to a fluid density of the formation fluid, first constituent and remainder constituent, accordingly, to regulate the flow of the respective fluid.

Abstract: This relates to a gas separator (8) of the cascade type, with stratified or non-stratified flow, equipped with automatic level control to perform a process of the gravitational separation of two immiscible fluids of different densities, particularly to separate the gaseous phase from a two-phase mixture (liquid and gas). It is installed at the bottom of an oil well, upstream from a lifting pump (12) in order to minimize the entry of gas into pump (12). The level control system comprises a valve (29), a spring (30) and a packer (26). It is based on the combined effects of the abovementioned components (26, 29, 30), the gas pressure on the region of perforated casing (10) and the thrust exerted on a settling vessel (3) by the liquid on which it floats. The separator according to the invention has a control system for the level of the liquid stored in settling vessel (3) mounted within its separator (8), ensuring flow of the mixture which is ideal for the occurrence of gas separation.

Abstract: A downhole injector 10, 26, 38 and 54 is provided at the lower end of the production tubing string TS for passing liquids from a downhole formation into the tubing string while preventing gases from passing through the injector. The injector may include an improved screen 36 for preventing formation sand from entering the injector. The system may include a packer 44 in the annulus A above the injector. In one application, a vent tube 46 extends upward from the packer into the annulus for maintaining a desired liquid level in the annulus above the packer. A plurality of through ports 40 establish fluid communication in the annulus above the packer and the production tubing string so that a downhole pump P may efficiently pump downhole fluids to the surface. The injector of the present invention may be used with one or more lift valves LV for raising slugs of liquid upward to the surface through the production tubing string.

Abstract: A gas separator connectable between the seating nipple/pump and the mud anchor of a well production line takes advantage of gravitational, shear and centrifugal forces to detrain gas from the formation fluid. An outer cylindrical tube is concentrically secured by upper and lower couplings in relation to an inner cylindrical tube having an axial flow passage and a plurality of radial perforations. The upper coupling is adapted for connection to the seating nipple/pump and the lower coupling is adapted for connection to the mud anchor. The couplings each have a passage therethrough to extend the inner tube axial flow passage in fluid communication between the pump and the mud anchor. The outer cylindrical tube has a plurality of inwardly downwardly centrifugally oriented passages for admitting liquid entrained with gas into an annulus between the tubes and for causing the admitted liquid to flow in a downward spiral in the annulus.

Abstract: A technique is described for producing fluids from a series of wells. Production fluids from production wells are raised from the wells and deposited in a separation unit. The production fluids typically include both liquid and gas phase components. The separation unit utilizes a plurality of separation stages to separate the gas and liquid phase components in the production fluids.

Abstract: This invention relates to a gas-lift ball control device in gas-lift ball oil recovery and a method of oil recovery with the device. In the device a low pressure gas outlet, an oil-gas-ball inlet and an oil outlet are provided on casing of an oil-gas-ball separator. A spiral pipe communicating with the oil-gas-ball inlet is provided within the casing. There is a separating umbrella on the spiral pipe and a filter below the spiral pipe. There is a ball-distributing valve inside the filter. The valve body is provided with a ball-entry bore, a low pressure gas-bore, a high pressure gas-entry bore and a high pressure gas-exit bore. There is a gas path communicating with said two pairs of bore in a manner of rotation or sliding. Gas and balls can be continuously supplied to a gas transporting pipe through the ball-distributing valve. The device is efficient with less gas and simple structure. It can be easily made and be securely and reliably operated.

Abstract: A system for producing a mixed gas-oil stream which contains solid particulates wherein gas is to be separated and compressed downhole in a turbine-driven compressor before the gas is injected into a subterranean formation. The stream is passed through a first separator to separate out the particulates which are then passed through a bypass in the turbine without contacting the rotary vanes of the turbine thereby alleviating the erosive effects of the solids.

Abstract: A system for removing solids from a well bore and reclaiming the well bore fluid. A work string is disposed within the well bore. The system includes a gas separator, connected to a return line from the well bore, for separating the gas component from the well bore fluid, and wherein the gas separator has a first outlet for exiting the gas component and a second outlet for exiting the well bore stream. Also included is a solids separator, connected to the second outlet, for separating the remainder of the well bore fluid into a first stream containing the solids and a second stream containing the well bore fluid. The solids separator may be located longitudinally below the gas separator so that a hydrostatic head pressure aids in feeding the well bore fluid to the solids separator. The system further includes a cuttings box connected to the solids separator, with the cuttings box being configured to receive the solids from the solids separator.

Abstract: A technique is provided for supplying electrical power to a submersible pumping system in a well completion. The pumping system includes a submersible electric motor, a pump driven by the motor and a separator for separating liquid and gas phase components of the wellbore fluids. The gas phase components are produced through a first passageway in an isolating packer, with liquid phase components being produced through a separate passageway through the packer. A transition assembly, including a connector adapter is provided in either the liquid or gas flow path, and either on the lower or upper side of the packer. The transition assembly incorporates a connector for securing upper and lower cable portions to one another. The lower cable portion extends from the connector to the electric motor, while the upper cable assembly extends from the connector to the earth's surface.

Abstract: A method and system for producing a mixed gas-oil stream through a tubing wherein at least a portion of the gas is separated from the stream and flowed through a restriction in the tubing to cool the separated gas and reduce its pressure to thereby retain larger amounts of liquid (i.e. condensate) in the gas-oil stream which is to be produced to the surface. The separated gas is compressed downhole before it is injected into a downhole formation.

Abstract: A system for separating gas from a wellbore fluid as it is produced to the surface. The system includes a progressing cavity pump, a submergible electric motor and a fluid intake. The submergible electric motor is connected to the progressing cavity pump to drive the pump and draw wellbore fluid through the fluid intake. The fluid intake includes a hollow interior defined by a thick-walled section. Additionally, the fluid intake includes a plurality of fluid passageways extending through the thick-walled section. The passageways are oriented to create a reversal in fluid flow, and thus a release of gas, as the fluid is draw into the fluid intake.

Abstract: The invention concerns a pumping installation designed for being mounted in an oil well extending from the surface to a layer of oil-bearing rock, comprising a pipe column at the lower end of which is mounted a pump, a joint, mounted in the well around the pipe column and delimiting a chamber at the lower end of the well, in which is arranged a pump. The installation further comprises a hydro-ejector, in the pipe column, including a lower pressure zone opening into the upper end of the chamber.

Abstract: This is a high-efficiency item of equipment, for example for a well bottom for separating out gas from a liquid/gas mixture, based on the effects of flows of the cascade and segregated types. It consists basically of a sedimentation vessel whose lateral surface has holes in the upper portion, enclosing (i) a discharge pump, (ii) a suction pipe and (iii) the lower end of a production tubing. The vessel contains helicoidal surfaces for achieving segregated-type flow. A significant part of separation takes place above the level of the separator, in a medium in which there is a predominance of gas and the flow is in the form of a cascade.

Abstract: A downhole injector 10, 26, 38 and 54 is provided at the lower end of the production tubing string TS for passing liquids from a downhole formation into the tubing string while preventing gases from passing through the injector. The injector may include an improved screen 36 for preventing formation sand from entering the injector. The system may include a packer 44 in the annulus A above the injector. In one application, a vent tube 46 extends upward from the packer into the annulus for maintaining a desired liquid level in the annulus above the packer. A plurality of through ports 40 establish fluid communication in the annulus above the packer and the production tubing string so that a downhole pump P may efficiently pump downhole fluids to the surface. The injector of the present invention may be used with one or more lift valves LV for raising slugs of liquid upward to the surface through the production tubing string.

Abstract: A well production apparatus is provided for a well having a pressure control device operatively associated with the well for controlling pressure within the apparatus and well, wherein the apparatus includes a buoyant tubing member of a sufficient diameter to contain a submersible pump therein which is connected to a compressor. The apparatus further includes a gas fluids separator in the casing of the well. A fluids composition sensor and transmitter are provided for aiding in operating the apparatus.

Abstract: A technique is described for producing fluids from a series of wells. Production fluids from production wells are raised from the wells and deposited in a collection well. The production fluids may include both liquid and gas phase components. The collection well may serve to permit separation of the gas and liquid phase components under the forces of gravity. The fluids deposited in the collection well are separately displaced to a further collection and processing location. The head requirements for the pumping systems of the production wells is reduced by the need only to transmit the production fluids to the collection well. A pumping system in the collection well then produces some or all of the deposited fluids. Where the fluids include significant quantities of gas, the collection well pumping system may only produce the liquid-phase components, reducing the capacity requirements for the collection well pumping system.

Abstract: A gas recovery device utilizes membranes of a gas permeable, liquid impermeable substance to strip gas from gas-containing liquids, such as brine in subterranean geological formations. The device includes a shell defined by perforated outer walls and a plurality of elongated permeation tubes. Only one end of the tubes is attached to a plenum with the tube lumina in fluid communication with the plenum. The remainder of the tubes is not anchored and therefore is free to move. Substantially liquid-free gas is removed from the plenum through a pipe to a remote facility for storage and use. The gas recovery device can be deployed within the casing of a well suspended by the product discharge pipe and immersed in gas-containing brine flowing from a natural geological formation. The brine seeps into the well casing and flows through the perforations to surround the permeation tubes.

Abstract: A well production apparatus is provided for a well having a pressure control device operatively associated with the well for controlling pressure within the apparatus and well, wherein the apparatus includes a buoyant tubing member of a sufficient diameter to contain a submersible pump therein which is connected to a compressor. The apparatus further includes a gas fluids separator in the casing of the well. A fluids composition sensor and transmitter are provided for aiding in operating the apparatus.

Abstract: Method and apparatus for producing a first zone through a wellbore while simultaneously injecting gas into a second zone through the same wellbore. The production stream is produced to the surface through a string of tubing where gas is separated therefrom. The separated gas and/or gas from another source is then mixed with a carrier fluid (e.g. produced water, etc.) to form a mixture which, in turn, is pumped down the well annulus and through a downhole separator (e.g. an inverted hydrocyclone) where at least a portion of the gas is separated from the mixture. The separated gas is injected into the second zone while the remaining mixture is commingled with the production stream before the combined streams flow to the surface through the tubing.

Abstract: A well production apparatus is provided for a well having a pressure control device operatively associated with the well for controlling pressure within the apparatus and well, wherein the apparatus includes a buoyant tubing member of a sufficient diameter to contain a submersible pump therein which is connected to a compressor. The apparatus further includes a gas fluids separator in the casing of the well. A fluids composition sensor and transmitter are provided for aiding in operating the apparatus. A method of enhancing oil and gas recovery is also provided.

Abstract: A well production apparatus is provided for a well having a pressure control device operatively associated with the well for controlling pressure within the apparatus and well, wherein the apparatus includes a buoyant tubing member of a sufficient diameter to contain a submersible pump therein which is connected to a compressor. The apparatus further includes a gas fluids separator in the casing of the well. A fluids composition sensor and transmitter are provided for aiding in operating the apparatus.

Abstract: A well production apparatus is provided for a well having a pressure control device operatively associated with the well for controlling pressure within the apparatus and well, wherein the apparatus includes a buoyant tubing member of a sufficient diameter to contain a submersible pump therein which is connected to a compressor. The apparatus further includes a gas fluids separator in the casing of the well. A fluids composition sensor and transmitter are provided for aiding in operating the apparatus.

Abstract: An electrical submersible pump assembly has a diluent fluid injection line to reduce viscosity of well fluid. The electrical submersible pump includes impellers for displacing well fluids, and a base member having an intake port for receiving well fluid. An inducer having a helical flight is mounted below the impellers in the base member. The submersible pump is additionally provided with injection ports, preferably radially spaced around the base member proximate the inducer through which diluent is injected for mixing with the well fluid. The diluent is pumped down to the injection ports by an injection line that runs down from the surface.

Abstract: A downhole oil/water separation apparatus and process which separates solids from total production fluid prior to oil/water separation is disclosed. Production fluid is passed to a downhole solid/liquid cyclone which separates the fluid into a solids enriched stream and an oil/water stream. The oil is then commingled with the solids enriched stream and brought to surface. The water is reinjected downhole. The method effectively removes solids from the disposal fluid and thus avoids injectivity impairment caused by solids plugging.

Abstract: A borehole sucker-rod pumping plant for pumping out gas liquid mixtures comprising a driving rocker to which a string of sucker rods is connected that is secured to a plunger of a deep well pump having a first and suction valve in the lower part of a cylinder, a second suction valve in the cylinder wall at a distance from the first valve, and a pressure valve mounted in the plunger. The plant further comprises a receiving chamber separating the gas liquid mixture into a gas phase and a liquid phase and ensuring that the gas phase gets compressed. The chamber is arranged to be disposed upstream of the cylinder and has in one of the embodiments thereof an outlet valve mounted in its upper part upstream of the first suction valve. In another embodiment, the receiving chamber has an outlet pipeline disposed in the upper part thereof and communicated with the second suction valve.