Abstract: A system for injecting chemicals into a geothermal well near the bottom of the well bore for optimum efficiency. The system includes a spool assembly with a master valve for control of the geothermal flow and a secondary outlet formed of an angle to permit the chemical injection chamber to be lowered into the well. The secondary outlet is attached to the main spool in such a way as to allow internal thermal expansion while permitting the chemical injection chamber to be fed by capillary tube to the bottom of the well bore. The chemical injection device includes an injection chamber through which the chemical is disbursed and a segmented sinker bar to provide the necessary weight to carry the chamber to the bottom of the well against the geothermal well flow. An annular seal assembly in the spool prevents leaking by being pressure energized by the geothermal production fluid. As a result, production can continue during the chemical injection process.

Abstract: Apparatus and method are provided for washing apparatuses in use of remedial tubing. A cylindrical housing has a fluid expansion chamber with fluid passageways communicating between the housing and the chamber. A turbulating sleeve freely rotates relative to the housing. Compression ports permit fluid to be transmitted through the housing, the passageways and into the chamber for injection through the ports to activate rotary motion of the sleeve for turbulizing washing action. A second housing is provided on the apparatus having normally closed wash ports which are angularly directed toward the remedial tubing and rearwardly relative to the apparatus. The wash ports are normally closed and may be opened, selectively, and when open, fluid flow through the apparatus is directed only through the rearwardly directed wash ports to drive particulate matter impacted exterior of the tubing and rearwardly of the apparatus from the apparatus.

Abstract: A method and apparatus are provided for injection of fluid within a subterranean well for treatment of a production zone within a subterranean well by first initiating flow of treatment fluid into one of uppermost and lowermost portions of the zone and by subsequent continuation of flow of treatment fluid into the other of the uppermost and lowermost portion of the zone. A conduit is assembled which carries a zone isolator, and fluid communicating means having first and second communicating members. The conduit is run into the well until the isolator is set above the zone and the first communicating member is in proximity to the uppermost end of the zone and the second communicating member is in proximity to the lowermost end of the production zone. A first injection flow path is formed for the fluid which extends from the top of the well through the interior of the communicating means and out only the exterior of the second communicating member and into the lowermost end of the zone.

Abstract: A well is completed by cementing a casing string in place in the well. A jetting tool assembly is run into the casing string on a tubing string. The jetting tool assembly engages a sliding sleeve of a casing valve and slides the sliding sleeve to an open position uncovering a plurality of housing ports in the casing valve housing in which the sleeve is received. Then, disintegratable plugs are hydraulically jetted from the housing ports to communicate a subsurface formation adjacent the casing valve with an interior of the casing string. Preferably, prior to opening the sleeve and hydraulically jetting the plugs, residual cement is drilled from the casing string, then further residual cement is hydraulically jetted from the casing valve, and then the casing valve is backwashed by reverse circulation.

Abstract: A precipitation control additive composition, an acidizing composition for treating a sour well and a method of treating a sour well are provided. An iron sequestering agent and a sulfide modifier are added to a treating solution. The iron sequestering agent combines with iron present in the solution while the sulfide modifier combines with sulfides present in the solution. By combining with both iron and sulfides present in the solution, the combination of an iron sequestering agent and a sulfide modifier effectively inhibits precipitation of ferric hydroxide, ferrous sulfide and free sulfur from the solution. As a result, formation and other serious damage is prevented.

Abstract: A process for controlling biomass and cleaning water injection wells and oil producing wells by injecting an oxidant into the pumped water injection stream. Chlorine dioxide or sodium chlorite, depending on the reactants present in the well, may be injected by means of a stinger, a spool or a coiled tube into the pumped water injection stream. Chlorine dioxide is generated at the site and may be generated by any one of several known processes. Hydrochloric acid or other proton donor stream, a water stream, and a stream containing sodium chlorate, sodium chlorite, and optional sodium chloride may be mixed at an elevated pressure to create chlorine dioxide. The elevated pressure of the chlorine dioxide stream is maintained at or boosted to a level greater than the pressure of the water injection or oil-producing well to aid in the injection of the chlorine dioxide stream either from generation to the well or through a booster pump mechanism to the well.

Abstract: A combination circulating valve and fluid unloader adapted for connecting in a tubing string disposed within the well bore of a producing well which is closed to downward flow of fluids therethrough. The valve includes a tubular member with ports through the wall thereof having a sliding sleeve disposed around the outside surface which is also provided with ports through the wall thereof for passage of fluid into the annulus. Opening and closing of the valve is accomplished by shifting the sliding sleeve between three positions by changing the pressure of the fluids contained in the tubing string to overcome the force exerted by a spring biasing the sliding sleeve toward a first, closed position. When the pressure of the fluid is increased to a first selected pressure, the sliding sleeve is shifted with respect to the tubular member to a second, circulating position in which the ports of the tubular member are in fluid communication with the ports of the sliding sleeve.

Abstract: A method and downhole well installation for facilitating the removal of detrimental material such as sand accumulated within a well penetrating a subterranean hydrocarbon formation. A tubing string in the well extends to a production interval open to the formation. A production stinger is slidably disposed in the tubing string and extends downwardly from the bottom of the tubing string into the production interval. A seal is provided between the stinger and the tubing string which permits slidable movement of the stinger but provides for a seal against fluid flow upwardly in the stinger-tubing string annulus. A longitudinal passage extends through the stinger and opens into the tubing string above the seal. At least one inflow opening to the longitudinal passage is provided in the stinger near the bottom thereof. Thus, when the stinger comes to rest upon the sand or other unwanted material accumulated in the well, the inflow opening is located adjacent the surface of the unwanted material.

Abstract: A well clean-out tool comprising a ported nipple, thimble, packer cup, packer cup mandrel and an inner mandrel.

Abstract: Apparatus for pressurized cleaning of well flow conductors. The apparatus has a non-rotating inner mandrel, an adapter to connect the inner mandrel to a work string, a rotating housing on the exterior of the inner mandrel, and a nozzle body attached to the housing. An alternative embodiment of the invention allows cleaning tools to be attached to a modified nozzle body and rotated therewith. Fluid pressure flowing through the inner mandrel will cause the housing to rotate relative to the inner mandrel. Rotation is used to direct fluid jets in the nozzle body towards different portions of the interior of the flow conductor. Rotation of a cleaning tool can also be used for combined mechanical and hydraulic drilling to remove deposits from within a well flow conductor.

Abstract: A remedial treatment for coal degas wells is described which enhances the production flow of gas and/or water from the wells. The treatment comprises the steps of: (a) injecting an aqueous foam through the wellbore and into the coal seam(s) at a pump rate of about 10 to about 40 BPM; and (b) flowing back the well at the maximum rate through an open, unrestricted choke.

Abstract: The invention provides a method and apparatus for securement onto one end of a continuous length of remedial tubing which is introduced into a subterranean well concentrically through production tubing previously positioned within the well, with the well having a deviated configuration which includes an entry portion communicating with a curved portion extending downwardly in the well from the entry portion and a generally linear end portion traversable with a production formation. The apparatus includes a cylindrical housing and an element for securement of the housing to the tubing. A fluid passageway chamber is defined exterior of the housing with fluid passageways communicating between the interior of the housing and the expansion chamber. Turbulating elements are carried exteriorly around the housing and immediate the expansion chamber and are freely rotatable relative to the housing.

Abstract: A method and apparatus for servicing well casing and the like using a treating fluid, the apparatus having a first tool; a second tool having a pair of openings; conduit interconnecting the first and second tools in series relation so that a first of the pair of openings communicate through the conduit with the first tool and the second of the pair of openings communicates with the second tool; a source of treating fluid communicating with the second of the pair of openings; and a valve assembly borne by the second tool and engageable with the interior of the well casing and operable by such contact selectively to control the flow of treating fluid through the openings to the first and second tools.

Abstract: A device and method for continuously adding chemicals to a producing oil well to prevent the formation of paraffins, emulsions, scale and to prevent corrosion is described. The device includes an above ground mixing chamber having an inlet and an outlet. A portion of the flow of production oil is diverted from the production tubing to the inlet. Chemical are added in the mixing chamber, and the mixture is then flushed down through the well casing to the bottom of the well to be pumped up the production tubing. The device includes a sight glass on the mixing chamber to visually observe the mixture, a bleed valve on the mixing chamber to remove samples and the like, and a pressure gauge for registering the internal pressure within the chamber. A line check valve is provided at the inlet to close the inlet in the case of excessive back pressure to prevent a flow of chemicals back through the inlet, and a choke with a predetermined orifice is provided at the outlet to regulate the flow rate therethrough.

Abstract: A well bore annulus wiper plug is disclosed. The wiper plug has a central body and inner and outer elastomeric ribs. The ribs are generally in the shape of truncated cones. To operate the device, it is inserted in the annular space between well casing and a drill string. Fresh drilling mud is circulated downwardly through the annular space above the wiper plug. The wiper plug scrapes both the outside of the drill pipe and the inside of the casing free of a previous well fluid.

Abstract: The present invention relates to the use of a mixture of a salt of lactic acid and chlorus acid as an improved bactericidal agent in flooding waters used in oil recovery operations wherein the mixture is obtained by reacting lactic acid and sodium chlorite at a temperature ranging from about 60.degree. F. to about 80.degree. F. The use of other acids is also disclosed.

Abstract: A process of removing carbonates from a well of a water collection and treatment system utilizes "aggressive" water obtained prior to the end of the water treatment process to remove carbonate deposits from the well. A preferred embodiment uses water which is the product of a reverse osmosis desalinization water treatment step and which is injected with carbon dioxide to form an aqueous carbonic acid solution for removal of the carbonate.

Abstract: A system for conducting operations in a well penetrating laterally into a subsurface producing formation. The system employs two strings of tubing. One string extends from the surface throughout the well; the other string extends from the surface to a position generally above the lateral section of the well. Both strings pass through a dual packer installed above the formation.

Abstract: A method of removing polymeric material from injection and producing wells in which an aqueous medium containing, chlorine dioxide or sodium chlorite is introduced into the well and maintained in contact with the polymeric material for a period of time sufficient to degrade the polymeric material to a desired degree and allow enhanced injectivity of polymer flooding medium into the injection well or enhanced production from a producing well.

Abstract: A method for cleaning a horizontal wellbore where a first fluid have a known specific gravity is introduced into said wellbore. Thereafter, a second fluid having a specific gravity less than said first fluid is introduced into said wellbore. Said second fluid overrides the first fluid and contacts contaminants in the top of said wellbore while the second fluid contacts contaminants on the bottom of said wellbore. Both fluids and contaminants are removed thereby cleaning said wellbore.

Abstract: An annulus cementing and washout technique and equipment, particularly for use in an offshore oil or gas well. An annulus is formed between an outer casing and a second-outer casing, this annulus being filled with cement up to a predetermined level and washed free of cement above said level. The second-outer casing is fitted with a washout casing section having washports at the predetermined level. The washports are selectively opened and closed by axially moving a hollow sleeve mounted in the washout casing section, preferably by turning the sleeve on a screw thread using a remotely operated tool. Details of a suitable tool include spring-loaded radial dogs which engage axial slots within the sleeve. Use of the sleeve and the tool to move the sleeve enables the washports to be opened and closed as required without troublesome rotation or support of the casing.

Abstract: A process including the initial step of lowering a length of coil tubing down through the internal production bore, so that the end of the tubing which is at the depth of the preforations in the external casing, and a volume of fluid such as water is washed into the hole so that sand contained within the hole is washed out of the hole up through the annulus between the internal casing and the coil tubing. The coil tubing is then removed from the hole, and a second length of coil tubing is lowered into the hole with a blunt bottom gauge ring sub to approximately the same depth, and a quantity of ceramic beads are "squeezed" into the well bore so that the beads enter through the perforated tunnels and fill a zone exterior to the tunnels in the sand formation around the perforations.

Abstract: An improved process for removing from a wellbore in a subterranean formation particulate material bonded together by a cured phenolic resin. The material is contacted with a solvent composition comprising a liquid selected from the groups: N,N-dimethylformamide, N-methyl-2-pyrrolidone and mixtures thereof for a sufficient time to separate the particulate material and then the separated material is removed from the wellbore.

Abstract: The invention is a method of restoring the permeability of an underground hydrocarbon formation adjacent to a wellbore which comprises injecting a first aqueous solution of hydrochloric or hydrofluoric acid into a formation interval where permeability has decreased due to polymer plugging and producing that acid out of the well after a soaking period. A second solution of about 200 ppm to about 2% by weight of chlorine dioxide is injected into the same interval and followed by a third solution of hydrochloric or hydrofluoric acid. The second and third solutions are allowed to soak in the formation for about 4 to about 48 hours before placing the well back on injection or production.

Abstract: A method for selectively placing and removing a plugging agent in a formation adjacent a wellbore comprising preheating the wellbore, heating and injecting the plugging agent at a temperature higher than its melting point, shutting in the well to allow the plugging agent in the formation to cool and solidify, reheating the formation adjacent the wellbore, and swabbing back the liquidified plugging agent from the low permeability zones adjacent the wellbore. The expected benefit is reduction of permeability in the high permeability zones without a corresponding loss of permeability in the low permeability zones. The method provides better vertical sweep and improved recovery.

Abstract: A clean-out tool system for use with a oil well production tubing extending downward through a casing terminating in a production zone in the well bore, which zone is isolated by a packer and includes flow restricting debris to be cleaned out. A generally vertical, elongated, cylindrical tool body, having a relatively small diameter and a bore therein, is located down through the inner production tubing into the zone located at the end of a tubing string extending downward through the production tubing for communicating fluid pressure to the bore in the body. Four, peripherally spaced, elongated slots extend radially inward into the body with their longitudinal axes aligned with the longitudinal axis of the body and communicate with the bore in the body. An elongated blade is pivotally attached in each slot to the body, movable from a first configuration wherein the blade is positioned vertically within the slot, and a second, expanded configuration positioned radially outward in the zone.

Abstract: A method for removing flow-restricting matter such as paraffin, asphalts, clays, scales, or gyps from production equipment and producing formation of and in the vicinity of an oil or gas well. The method uses a combination of solutions consisting of mixed solvents and additives such as detergents, surfactants and acids. The solutions are electrolyzed along with the hydrocarbon product of the well in an above-ground reaction chamber. The electrolyzed mixture of solutions and hydrocarbon product are reintroduced immediately down the well casing and into the well formation.

Abstract: Water well treatment apparatuses and methods or procedures followed during such treatment in which fluids produced from the well are recycled through the well and aquifer with the recirculated fluids being subjected selectively to various treatment techniques to more effectively clean or otherwise treat the well and aquifer. By using various modifications of the basic arrangement, shallow wells and deep wells may be effectively treated and wells which use turbine pumps, submersible pumps and the like may also be effectively treated. The apparatus and method includes a structure for heating the recirculated fluid to desired temperature levels, adding various cleaning the treating solutions thereto, varying the parameters of the treatment methods in accordance with the conitions of the well and aquifer and purging the well when desired.

Abstract: A method and apparatus of chemically inhibiting corrosion of a borehole and connected flowlines. A mixing tank receives flow from the chemical pump. The mixing device is connected to the borehole. A timer device operates to allow sequential flow to the mixing tank. The treatment fluid admixes with the formation fluid downhole.

Abstract: A washing tool (24) attached to the lower end of a pipe string (18) includes a mandrel (28) between upper and lower subs (30, 32). The mandrel (28) has opposed spaced end sections (54 56) connected with an intermediate section (58). Each end section (54, 56) has a fluid inflatable elastomeric packer (64) thereon inflatable at a relatively low fluid pressure, and intermediate section (58) has a leaf spring (86) over a port (84) which is opened by outward movement of the leaf spring (86) at a second higher predetermined fluid pressure within the pipe string (18).

Abstract: A method for removing paraffin from a producing oil well comprising (a) contacting a mixture of a paraffin-dispersing effective amount of an alkyl or aralkyl polyoxyalkylene phosphate ester surfactant in the free acid form, or in the form of the alkali metal, amine, or ammonium salt, a mutual solvent and water, said mixture having a temperature of from about 30.degree. to 40.degree. F. higher than the melting point of the paraffin to be removed, with the interior of the oil well for a period of time sufficient to disperse paraffin within the well into the mixture; and (b)removing the mixture and the paraffin dispersed therein from the interior of the well.

Abstract: An oil well tool for in situ release of treatment fluid into an oil well is disclosed. A tubular body is insertable into an oil well casing, which tubular body carries a bladder containing treatment fluid. The body is closed at a lower end and has at an upper end a fishing neck connector. A weight slideable within the tubular body compresses the treatment fluid within the bladder and forces the treatment fluid under a constant pressure through a fluid passageway. The size and length of the fluid passageway, combined with the pressure applied and viscosity of the treatment fluid, dictate the flow rate at which the treatment fluid is deposited into the oil well. The treatment fluid mixes with other fluids being circulated through the well formation. The primary purpose for the treatment fluid is to inhibit scale buildup and corrosion. This is accomplished by slow release of the treatment fluid over an extended period of time.

Abstract: A downhole cutting tool, specifically adapted to function as an enhanced diameter clean-out tool, includes longitudinal bores which are opened to fluid flow when cutting members are moved to their extended positions. Upper and lower subassemblies are connected through an adapter which establishes an angular offset between an upper pair of extendible members and a lower pair of extendible members, which upper pair functions as a stabilizing structure to stabilize rotation of the tool and which lower pair functions as an enhanced diameter cutter.

Abstract: A composition, useful for dissolving sulfur, which comprises a major amount of a disulfide or polysulfide and a catalyst comprising one or more polyalkyleneoxyamines or polyamines, and methods for using the composition in a system to prevent sulfur-plugging, are disclosed.

Abstract: Apparatus for pressurized cleaning of flow conductors. The apparatus has a first mandrel and a second mandrel telescoped therein. A cleaning tool can be attached to the second mandrel. Changes in fluid pressure flowing through the mandrels will cause the second mandrel to rotate relative to the first mandrel. Rotation is used to direct fluid jets in the cleaning tool towards different portions of the interior of the flow conductor. Rotation of the cleaning tool can also be used for hydraulic drilling of deposits within the flow conductor.

Abstract: A composition for use in agglomerating and removing solid contaminants in well fluids is disclosed. The composition comprises a carrier and the amide/glyceride reaction product obtained by heating a secondary amine in the presence of a fat or oil. The composition is used in processes to agglomerate the solids in contaminated well fluid and in which the agent is diluted and used as a preflush prior to replacing drilling mud with fresh well fluid.

Abstract: A device for continuously adding chemicals to a producing oil well to prevent the formation of paraffins, emulsions, scale and to prevent corrosion is described. The device includes an above ground mixing chamber having an inlet and an outlet. A portion of the flow of production oil is diverted from the production tubing to the inlet. Chemicals are added in the mixing chamber, and the mixture is then flushed down through the well casing to the bottom of the well to be pumped up the production tubing. The device includes a sight glass on the mixing chamber to visually observe the mixture, a bleed valve on the mixing chamber to remove samples and the like, and a pressure gauge for registering the internal pressure within the chamber. A line check valve is provided at the inlet to close the inlet in the case of excessive back pressure to prevent a flow of chemicals back through the inlet, and a choke with a predetermined orifice is provided at the outlet to regulate the flow rate therethrough.

Abstract: The invention provides a surfactant mixture, comprising a zwitterionic surfactant, a nonionic surfactant and a cationic surfactant, which forms a foamable liquid composition upon addition to aqueous media including fresh water, brines, acids and water/alcohol mixtures. The foams prepared from the foamable liquid composition have utility as fracturing fluids and well cleaning fluids.

Abstract: A system for cleaning perforations in a well bore by surging formation fluid through the perforations. A wireline retrievable well tool is installed in the well bore above the perforations to establish a fluid barrier which will divide the well bore into a first fluid pressure zone and a second fluid pressure zone. The well tool includes a flow path closure device which will suddenly open when the difference in pressure between the first zone and the second zone exceeds a preselected value. The sudden opening of the closure device results in a surge of fluid flow from the downhole formation which cleans the perforations.

Abstract: A method and apparatus for rotating a portion or segment of a casing string in a relatively highly deflected well bore. A straight well bore portion is provided adjacent the completion interval, beyond the deflected portion. A casing string is made up with a segment connected by a swivel to the remainder of the string. This segment is located in the straight portion of the bore. A drill string is lowered into the casing into engagment with a rotatable swivel portion fixed to the casing segment. The drill string is rotated to rotate the casing segment independently of the remainder of the casing string. This facilitates removal of excess mud cake from the annulus adjacent the casing segment, and also placement of cement in the annulus.

Abstract: Apparatus for pressurized cleaning of flow conductors. The apparatus has a first mandrel and a second mandrel telescoped therein. A cleaning tool can be attached to the second mandrel. Changes in fluid pressure flowing through the mandrels will cause the second mandrel to rotate relative to the first mandrel. Rotation is used to direct fluid jets in the cleaning tool towards different portions of the interior of the flow conductor. Rotation of the cleaning tool can also be used for hydraulic drilling of deposits within the flow conductor.

Abstract: A process of removing carbonates from a wall of a water collection and treatment system injects carbon dioxide into "aggressive" water obtained prior to the end of the water treatment process to form aqueous carbonic acid solution which is pumped into the well to react with the carbonate deposits to form bicarbonate solutions which are pumped from the well. A preferred embodiment forms the acid solution with the product of a reverse osmosis desalinization water treatment step. Another embodiment forms the solution with the product of a softening step.

Abstract: A method and apparatus for cleaning a well wherein chemicals are applied to the well screen with steam. The well screen may be first washed with a sterilizing agent, and subsequently a chemical mix is added to the steam. The chemical mix includes a sterilizing agent, an acid, and perhaps a surfactant. The well is capped during treatment so the well becomes pressurized; and, the chemical mix is forced out beyond the well screen. The surfactant aids in penetrating the clog, while the sterilizing agent kills any plant or animal life that is causing or contributing to the clog. Some sterilizing agent may remain to prevent regrowth of life forms that may feed on other chemical components. The well may be surged to assist further in breaking up the mass clogging the well.

Abstract: A device adapted to clean well screens and to open aquifer formations including high pressure water jets directed at the formation through the screen and including a pumping device to extract the water forced from the jets and to create turbulence to cause washing action, and the method of cleaning the screen comprising directing jets of water through the screen and causing a turbulent washing action by which the screen is washed.

Abstract: A method and apparatus for perforating at least one mineral-producing zone in a wellbore wherein a packer and perforating gun assembly is employed which will allow the removal of wellbore liquid initially present in the wellbore adjacent said zone to be removed after the packer and perforating gun assembly has been fixed in the wellbore so that subsequent detonation of said perforating gun is carried out in a liquid which is nondeleterious to said zone.

Abstract: A perforation apparatus is coupled to a tubing string and is eccentrically positioned in a casing in a well bore by eccentering devices so that annular sealing rings along the length of the apparatus sealingly engage the casing. Shaped charge devices are arranged in pairs so that a pair of shaped charges produces, when detonated, a horizontal and an inclined perforation which intersect in the earth formations behind the casing. One of the perforations extends through a sealing ring to the interior of the perforating apparatus and one of the perforations opens to the casing. By applying differential pressure between the fluid in the casing and the inside of the tubing, for example by running the tubing dry, hydraulic jetting of fluid is produced in one perforation with a fluid return though the other perforation to the tubing string.

Abstract: A process for sealing casing leaks comprises cleaning out the annulus between the tubing and the casing, situating a gelable mixture in the annulus at the loci of the leak in the casing, pressuring the mixture through the leak into the formation and effecting gelation of the mixture. Optionally, the remaining gelable mixture may be circulated out of the annulus. Gelable mixtures can be comprised of various organic and inorganic gel polymers.

Abstract: In a drill string connected to a wash pipe for retrieval of a fish in a well borehole, an apparatus comprising a connected tubular member therebetween having an internal movable sleeve. The sleeve is located close over a set of bypass ports to the exterior. The ports are selectively opened or closed; when closed, the fluid flow is directed to the fish in the wash pipe. A method of washing is set forth including the steps of controlling fluid flow so that, during running in of the wash pipe over the fish, fluid is bypassed. The bypassing occurs during the fish engagement improving speed of running in up to the time the wash pipe telescopes significantly over the fish.

Abstract: Sand is evacuated from horizontal and vertical wellbores utilizing a jet pump connected to the distal end of a concentric tubing string which is insertable in the wellbore and extendable from the earth's surface or from a seal member providing a crossover flow path between the wellbore annulus above the seal member and the inner tubing member of the concentric tubing string. The jet pump includes a plurality of nozzles for ejecting evacuation of fluid into the wellbore to agitate and entrain accumulated solids for flow into a pump inlet cavity and to be propelled out of the pump by a portion of the evacuation fluid acting as a jet pump power fluid. The inner tubing member may be coilable tubing which is inserted into the outer tubing member after the jet pump has been lowered into the wellbore. An upper portion of the concentric tubing string may be made up of preassembled sections of the inner and outer tubing members.

Abstract: A method and apparatus for distributing fluids within a subterranean borehole wherein a submersible pump is introduced into the borehole at a first location. An intake port of the pump is connected to the first end of an intake duct having an unconnected second end located at a second location within the wellbore from which location fluid is to be withdrawn. An output port of the pump is connected to a first end of a second duct having an unconnected second end at a third location within the wellbore into which location fluid is to be introduced. By activating the pump, fluids, such as scale and corrosion inhibitors, are distributed from above the intake of a production pump to as low in the borehole as is required to protect wellbore contents.