Abstract: A method for cleaning a casing of an oil well is disclosed. Operational parameters for a cleaning tool may be defined based, at least in part, on results of a survey of the well. The cleaning tool may include a discharge head to generate electrical discharges between a pair of electrodes, the electrical discharges causing shock waves to remove deposits from the casing. The cleaning tool may be lowered into the casing. The cleaning tool may generate shock waves in accordance with the defined operational parameters to clean a predetermined target portion of the casing. The cleaning tool may be withdrawn from the casing.

Abstract: The present invention relates to hydraulic jars which include a jar body; a spindle axially movable within the jar body and coupled to the jar body by means of a helical splined coupling; the spindle being connectable to a pipe string and the stuck object; a cylinder concentrically placed within the jar body with a radial gap, and having chambers for filling with a work fluid, the chambers being separated by a piston and fluidly connected by a channel, wherein the channel is provided by a back valve. The piston is axially movable within the cylinder, and is connectable to the spindle by means of a tractive rod, and to the body by means of a compensative rod. The piston is further provided with elastic split compression rings having initial gaps equal or close to zero.

Abstract: A method of analyzing a wellbore fluid that includes treating a wellbore fluid with an emulsifying fluid, the emulsifying fluid comprising: a hydroxylated ether; an amphoteric chemotrope; and testing the treated wellbore fluid for at least one of turbidity and total suspended solids is disclosed. Methods of cleaning wellbores are also disclosed.

Abstract: A torque resistant casing scraper for attachment to a drillstring is comprised of a one piece tool body having rotationally unrestrained two-piece blade carriers with hardened diamond-shaped cutting blades and rotationally unrestrained two-piece axial centralizers. Adjoining blade carriers and centralizers rotate independently of the drillstring and the blade carriers interlocked to prevent relative rotation between the blade carriers and to index, or orient the cutting blades as desired along the longitudinal axis of the casing scraper. The diamond-shaped cutting blades and the indexed blade carriers allow both right-handed and left-handed drillstring rotation without reducing utility or effectiveness of the scraper. The casing scraper is particularly effective for deep, near-horizontal wellbores.

Abstract: Systems, devices and methods for strands of conductor oriented in a first direction; and strands of soft magnetic material oriented in a second direction that is different from the first direction evaluating a downhole fluid from a borehole intersecting an earth formation. The method may include filtering magnetic particles in the downhole fluid by activating a switchable magnetic filter when the downhole fluid enters a sample chamber in the borehole. The downhole fluid may include formation fluid. The filter may include a wire mesh comprising strands of conductor oriented in a first direction; and strands of soft magnetic material oriented in a second direction. The method may also include cleaning the switchable magnetic filter by deactivating the switchable magnetic filter. Cleaning the switchable magnetic filter may include removing filtered particles using a fluid. The fluid may be at least one of: i) the downhole fluid; and ii) engineered fluid.

Abstract: A method of cleaning a wellbore prior to the production of oil or gas is disclosed, wherein the wellbore has been drilled with an invert emulsion drilling mud that forms an invert emulsion filter cake. The method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid includes an aqueous fluid, and imino diacetic acid or salt thereof. Optionally an acid buffering agent, and a weighting age are also included. The breaker fluid is formulated such that after a predetermined period of time and the filter cake present in the wellbore or on the wellbore face is substantially degraded. Other methods may also include drilling the wellbore with a water-based drilling mud that forms a water-based filter cake, wherein the method may include the steps of circulating a breaker fluid into the wellbore, where the breaker fluid may include an aqueous fluid, and an iminodiacetic acid or a salt thereof.

Abstract: A flow line cleanout device for a coiled tubing head of a coiled tubing string is comprised of a hydraulic vane motor assembly having a rotor configured for attachment to and rotation of a work tool such as a fluid ejecting nozzle to be inserted into a flow line. Seals around the device seal the flow line so that fluid pressure behind the coiled tubing head force fluid through the hydraulic vane motor assembly to rotate the rotor and the attached nozzle in response to pressure changes created by check valves. Jets of fluid from the rotating nozzle serve to wash and remove blockages in the flow line and facilitate the insertion and advancement of the coiled tubing string.

Abstract: A downhole tool for removing debris from a wellbore comprises a mandrel and a shroud disposed around a portion of the mandrel. The mandrel includes at least one mandrel port in fluid communication with a mandrel bore. The shroud includes a cavity and a shroud port. Debris laden fluid is pulled into the shroud cavity by flowing fluid through the mandrel bore, out the mandrel port, into the shroud cavity, and through the shroud port. The debris-laden fluid is pulled into the shroud cavity due to a pressure differential created by the flow of the fluid through the mandrel port and out of the shroud port. As the debris laden fluid flows into the shroud cavity, the debris is captured within the tool.

Abstract: Apparatus (100) for use in top filling of tubulars comprising an inlet (200) for fluid communication with a top drive for providing top filling fluid, and an outlet (300) for fluid communication with a tubular. The apparatus (100) comprises a filter configuration (120), in fluid communication with the inlet (200) and the outlet (300) and configured to remove debris from a top filling fluid flow flowing from the inlet (200) to the outlet (300) during top filling of a tubular.

Abstract: The present invention is directed to a cross-linked scale control agent particle comprising: a scale control agent and a cross-linker. The scale control agent is cross-linked by the cross-linker. The present invention is also directed to a cross-linked organic-based crystalline inhibitor particle comprising: an organic-based crystalline inhibitor and a cross-linker. The organic-based crystalline inhibitor is cross-linked by the cross-linker. The present invention is also directed to the use of cross-linkers which can also act as benefit agents and to the use of capping and extension agents which act as further benefit agents The present invention is further directed to a particle comprising more than one cross-linked active agents; the active agent may be a combination of a scale control agent and an organic-based crystalline inhibitor.

Abstract: A combined activator-breaker fluid system is effective in oil and gas field applications to essentially simultaneously activate or deploy a shape-memory material and at least partially remove a polymeric filter cake left by a drilling mud, all in one step or trip.

Abstract: Disclosed herein is an autonomous and consistently active acoustic rehabilitation technology for wells, reservoirs, and extraction of natural resources using a borehole method. The invention can be used in oil, gas, mining, geological exploration industries, and in extraction technologies for oil and gas, including shale. It is especially useful for improvement of oil and gas output from wells and stimulation of production for maximizing recovery from reserves. The invention is applicable to areas including, but not limited to, well reserves using pumps, layer pressure supporting wells, and offshore-bed wells.

Abstract: A method of cleaning a wellbore drilled with an oil-based drilling fluid that forms an oil-based filter cake may include: emplacing a breaker fluid into the wellbore, the breaker fluid comprising: a water-miscible non-aqueous fluid; at least one weighting salt; and at least one breaking agent; and shutting in the well for a period of time sufficient to initiate breaking of the oil-based filter cake.

Abstract: A system and method for removing liquid from a horizontal wellbore is disclosed. The system and methods utilize multi-conduit tubing associated with one or more liquid intake port(s) positioned at selected locations along the tubing and positioned within a wellbore. The one or more liquid intake ports are typically placed at liquid accumulation points along the primarily horizontal section of the wellbore.

Abstract: A method (50) and an assembly (10) for milling an obstruction disposed within a wellbore (W) includes a milling module (12) having a motor (22) rotating a milling bit (14), a first electronics cartridge (26) for controlling the motor based upon a motor torque value, a tractor module (16, 18) for engaging with the wellbore and providing a push force against the wellbore to urge the milling assembly in a direction of the milling bit, and a second electronics cartridge (28) for controlling a push force value of tractor module. The method involves rotating the milling bit (54) and engaging the tractor module with the wellbore (56), and adjusting, iteratively, the operation (58) based on a calculated torque value and a calculated push force value to maintain the calculated values at around a target torque value and below a push force limit value (66, 70).

Abstract: Embodiments relate to removing residue from a well bore and well bore equipment with a treatment fluid composition, and in some embodiments, to treatment fluid compositions that comprise nanoparticles. An embodiment provides a method of removing drilling fluid residue from the surfaces of well equipment. The method comprising: applying a solid nanoparticle film to at least a portion of the surfaces of the well equipment with a treatment fluid comprising solid nanoparticles; and allowing the solid nanoparticles to interact with the surfaces of the well equipment and the drilling fluid residue adhered to the surfaces of the well equipment to remove at least a portion of the drilling fluid residue from the surfaces of the well equipment.

Abstract: A method of drilling and cleaning a wellbore includes providing a drill string having a drill bit and a cleaning tool with selectively activatable cleaning members; drilling a wellbore using the drill bit while maintaining the cleaning members in a deactivated position; and pulling the drill string from the wellbore with the cleaning members in an activated position, to thereby clean the wellbore. A corresponding cleaning tool includes a body having a bore running therethrough, a sleeve located within the bore, the sleeve including a ball seat and the sleeve being biased in a first direction, and a plurality of selectively activatable cleaning members mounted for repeated movement relative to the body between activated and deactivated positions.

Abstract: A debris removal system includes a tubular. A closure mechanism arranged to at least partially close an interior of the tubular. An injector mechanism having an exit arranged downhole of the closure mechanism; wherein debris removing material ejected from the injector mechanism is directable towards the closure mechanism. Also included is a method of removing debris in a downhole tubular.

Abstract: A debris reducer for reducing debris within a fluid flow line having a lower screen that is secured within the flow line, the lower screen having a lower screen cage with a lower cutting portion. A debris reducer element is retained within the flow line and is moveably disposed with respect to the lower screen. The debris reducer element has an upper screen cage with an upper cutting portion. The upper and lower screen cages overlap and move the upper and lower cutting portions with respect to each other to reduce debris within fluid flowing through the flow line.

Abstract: A subterranean debris catcher swirls the incoming debris laden stream by putting grooves or spiral projections on the inside of the inlet pipe. The solids come out of openings in the side of the inlet pipe and in others the solids can exit near the top either directly into the enclosed solids holding volume as the liquid exits straight out or the solids can be discharged out the end of the inlet pipe into the bigger open space defined by the housing. In the latter case the inside housing wall can have a screen or vanes that slow down the solid particles as the fluid continues to a housing exit and eventually to an exit screen before being discharged to either go to the surface or recirculate back along the outside of the tool to the inlet pipe while picking up additional debris.

Abstract: The present invention relates to an apparatus and a method for collecting debris in a wellbore.

Abstract: A tubing cleaning system comprising: a body portion, a tubing aperture, a one or more spray heads, a fluid input and a one or more fluid channels. Said body portion comprising a one or more plates. Said tubing aperture through said one or more plates. Said one or more spray heads arranged within said tubing aperture. Said fluid input. Said one or more fluid channels cut into said one or more plates between said fluid input and said one or more spray heads.

Abstract: A downhole tool including a resilient body configured to be disposed on a drill string, the resilient body comprising a plurality of radial blades having an abrasive coating, wherein the radial blades are configured to deflect when inserted into downhole tubing, and wherein the resilient body is configured to allow rotation relative to the drill string. Additionally, a method for cleaning downhole tubing, the method including inserting a resilient scraper disposed on a drill string into the downhole tubing, the resilient scraper including a plurality of radial blades having an abrasive coating. The method further including rotating the drill string, and contacting the resilient scraper to an internal wall of the downhole tubing.

Abstract: A fitting having a cover tube connected to one end and a pressure line in the fitting, connected to a rigid tube projecting from the fitting and through the cover tube. The method includes projecting a rigid tube in a masonry bore, and applying pressurized air to blow debris from the bore to be captured in a cover tube.

Abstract: A remotely operated device for inspecting and/or cleaning a subsea flexible pipe joint comprises a support assembly. In addition, the device comprises a tool positioning assembly coupled to the support assembly. The tool positioning assembly includes a rotating member disposed about a central axis. The tool positioning assembly is rotatable relative to the support assembly about the central axis. Further, the device comprises a cleaning assembly including a cleaning device adapted to clean the flexible pipe joint. The cleaning device is axially moveable relative to the rotating member. Still further, the device comprises a clamping assembly coupled to the support assembly. The clamping assembly has an open position disengaged with the section of the flexible pipe joint and a closed position engaging the section of the flexible pipe joint.

Abstract: A downhole debris recovery tool including a ported sub coupled to a debris sub, a suction tube disposed in the debris sub, at least one magnet disposed in the debris removal tool, and an annular jet pump sub disposed in the ported sub and fluidly connected to the suction tube. A method of removing debris from a wellbore including the steps of lowering a downhole debris removal tool into the wellbore, flowing a fluid through a bore of an annular jet pump sub, jetting the fluid from the annular jet pump sub into a mixing tube, displacing an initially static fluid in the mixing tube through a diffuser, thereby creating a vacuum effect in a suction tube to draw a debris-laden fluid into the tool, flowing the debris-laden fluid past at least one magnet disposed in a debris housing, and removing the tool from the wellbore is also disclosed.

Abstract: A jetting tool includes a tubular housing having: couplings formed at each longitudinal end thereof, and one or more ports formed through a wall thereof and in fluid communication with an upper portion of a bore of the housing. The jetting tool further includes a valve mechanism isolating the housing bore upper portion from a lower portion thereof in a closed position and operable to an open position where the valve mechanism provides fluid communication between the housing bore portions.

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: Formulation for a natural product as a replacement for the use of traditional acidic chemical stimulation methods for the emulsification, removal and release of paraffin and asphaltenes from low producing or pumped off wells and reservoirs with the use of traditional methodologies. Also a method of use of formulation for stimulating an oil well consisting of introducing into the wellbore a biodegradable, non-reactive fluid system containing a water-miscible fatty acid solvent, a solution of fatty acids, an amino alcohol, and at least one non-ionic surfactant. The fluid system may be further in the form of a nanoemulsion that is formed by combining a colloidal solution with one or more emulsifiers, an alcohol, and water. The fluid system may be used in well remediation and stimulation as well as additional, alternative applications such as the cleaning of surface and/or downhole equipment.

Abstract: A downhole hydraulic tool employing multiple nozzles in a selectable fashion from an oilfield surface. At least one of the nozzles of the tool is equipped with a burst disk such that fluid pressure directed from the surface may be utilized in activating the nozzle. The pressure may be driven to exceed a predetermined level for sake of the activating by way of sealing off access to other nozzle(s) therebelow, for example, by way of standard ball drop techniques. Thus, nozzle selectivity may be taken advantage of when a first nozzle wears out without requiring time consuming removal of the tool from the well for sake of remedial repairs or replacement.

Abstract: A remediation process that a employs improved quantitative method(s) of estimating of the volume and/or mass of contaminant in the subsurface, removal and or in situ degradation of the contamination using subsurface pulsing treatment (“SPT”) technology, and evaluation of the degree of remediation by re-applying the quantitative contaminant evaluation methods. The process uses SPT technology with the addition of a vacuum or sub-atmospheric pressure to an extraction well in order to create a push-pull effect to remove free contaminant or residual in conjunction with the pressure wave driving force created in the excitation or excitation well. The process can quantitatively measure the amount of residual contaminant, which up until now has not been possible or tractable using in situ methods, as well as measure the amount of residual that can be removed by SPT.

Abstract: A tool for cleaning a casing tubular (13??) via a narrower casing tubular (9??) or width restriction, has an elongate tool body 1 with axial throughbore 2, box 3 for a corresponding pin 4 to form a tool joint with a workstring 5. In FIG. 1, the body has a nose 6 with fluid discharge channel 7 to pass circulation fluid. An internal shoulder provides a valve seat 8 for a ball 9 passed through the workstring under gravity or during pumping of fluid. Transverse channels 10 receive fluid diverted when the ball is seated within the tool. A side surface 21 has fluid outlet ports 11, and at least one further working surface 22 has tool elements, e.g. bristle-type cleaning elements 23, or scrapers or wipers. Thus the tool body is asymmetrical offering jetting functionality on one side of the tool and mechanical cleaning on the other side.

Abstract: An assembly for removing debris and/or conducting a wellbore operation may include a mandrel, a sliding sleeve rotationally coupled to the mandrel, and a flushing sleeve coupled to the sliding sleeve. A releasable connection may temporarily prevent axial movement between the sliding sleeve and the mandrel. A downhole tool may be coupled to the mandrel to conduct the wellbore operation. The flushing sleeve may be hydraulically actuated to an extended position ahead of the downhole tool. A method of removing debris from a wellbore and conducting a wellbore operation may include lowering an assembly into the wellbore, supplying pressurized fluid into the wellbore using the assembly to remove debris from the wellbore, and moving a downhole tool to a position where at least a portion of the downhole tool is disposed outside of the assembly to conduct the wellbore operation.

Abstract: Methods are included that are useful in treating subterranean formations and, more particularly, to minimizing particulate migration over long intervals in subterranean well bores that may be horizontal, vertical, deviated, or otherwise nonlinear. In one embodiment, a method is presented comprising: providing a well bore comprising an open hole section of about 30 feet or more that comprises an open hole section with a filter cake neighboring at least a portion of a reservoir; allowing the integrity of at least a portion of the filter cake to become compromised; and treating at least a portion of the open hole section with a consolidating agent system in a single stage operation so as to at least partially reduce particulate migration in the open hole section.

Abstract: An apparatus for cleaning the inner wall of wellbores and for capturing downhole wellbore debris. An elongated, tubular central mandrel is provided with recesses on its outer surface. Various service elements are interchangeably mounted over the split rings. The various service elements include stabilizers, brush assemblies, junk baskets and magnets.

Abstract: An apparatus for modifying the wall surface of a borehole drilled through an underground formation. The apparatus comprises a tool body that can be introduced into the borehole using a conveyance system so as to be moveable along the borehole, and one or more members arranged so as to be able to be urged against, and moved across at least part of the borehole wall in order to work the surface thereof and modify its properties. A method of modifying the wall surface comprises positioning the tool body in the borehole at a location of interest using the conveyance system, urging the members against the borehole wall with sufficient force to modify the properties of the surface thereof, and moving the members across the surface of the borehole wall.

Abstract: A combination tool is delivered to compacted debris above a packer whose plug is to be removed. The shoe or mill is on the lower end of an outer bushing and the grapple or overshot is held within the bushing but away from the shoe so that the shoe can advance into the debris as reverse circulation takes the cuttings up through a mandrel to a debris removal tool. When the shoe lands on the packer the surface personnel can see it on the weight indicator. Weight is then set down to overcome a resisting force of a breakable member such as a shear pin or a spring or both so that the grapple advances to engage the packer plug. Advancing the mandrel relative to the bushing with the shoe at its lower end also releases a torque lug that previously allowed tandem rotation of the mandrel with the bushing.

Abstract: A wellbore cleaning tool for removing irregularities along the inner surface of a wellbore tubular may include a top sub, a cutting assembly, and a bottom sub. The tool is operable to remove irregularities, such as debris, burrs, and jagged edges, along the inside of the wellbore tubular, and thereby provide a clean, inner surface finish. The tool may be actuated into a retracted position, an extended position, and/or a deactivated position.

Abstract: This invention relates to compositions and methods of removing an organic deposit including introducing a fluid, wherein the fluid comprises at least two non-polar organic solvents and at least two polar organic solvents; allowing the fluid to dissolve at least a portion of the organic deposit; and removing at least a portion of the fluid. This invention relates to compositions and methods of removing an organic deposit including introducing a fluid, wherein the fluid comprises at least two non-polar organic solvents and at least two polar organic solvents, wherein the non-polar organic solvents comprise aromatic naphtha, terpenes, kerosene, and combination thereof, and wherein the polar solvents comprise heavy aromatic naphtha, cyclohexanone, N-2-methyl pyrrolidone, N-ethyl-2-pyrrolidone, and combination thereof, allowing the fluid to dissolve at least a portion of the organic deposit, and removing at least a portion of the fluid.

Abstract: A tool for suspending in a well retrieves various metal debris from the well, and includes an elongated tool body with a plurality of magnets included in a plurality longitudinal ridges which are circumferentially spaced. In the method a plurality of magnets can be positioned within openings, recesses, or pockets in each ridge, and held in place by one or more retaining plates, the tool being connected to a drill string and lowered into a well.

Abstract: A downhole tool for removing debris from fluid flowing through the downhole tool uses a screen member and wiper member, the wiper member having at least one window disposed through the inner and outer wall surfaces of the wiper member. Either the screen member or the wiper member is rotatable such that rotation of the screen member or the wiper member causes debris disposed on the outer wall surface of the screen member to fall-off the screen member. At least one directional port disposed at either the upper end of the screen member or the upper end of the wiper member causes rotation of the screen member or wiper member when fluid flows through the downhole tool.

Abstract: A water-based fluid, containing: a non-ionic surfactant, which is stable in a temperature range from 10 to 90° C. and soluble in water; and a salt, wherein the non-ionic surfactant contains an alkyl polyglucoside selected from the group consisting of a C8 alkyl polyglucoside, a C10 alkyl polyglucoside, and mixtures thereof, and the salt is present, and is present in an amount up to 60%. In addition, a process for preventing the formation of a W/O inverse emulsion or resolving a W/O inverse emulsion that has already formed in an oil well in which an oil-based mud has been employed by injecting the water-based fluid into the oil well.

Abstract: A cleaning tool (1) for use in cleaning ferrous material from a wellbore has a magnetic cleaning element (14) mounted to a tool body (2) within a slot (5) using a releasable concealed interference fit fastener assembly (15) comprising a fastener member having a head (16), and a shank (17) with a configured end (18) and a deformable fastener ring (20) adapted to fit closely over the shank, and a press-fit collar (21) adapted to deform the deformable fastener ring upon the configured end of the shank when assembled, and wherein the respective head and collar are each flanged to permit an interference fit with a corresponding contact surface of the tool body around said slot.

Abstract: The method for subsea well intervention includes creating a lubricator section within the production tubing of the well. The lubricator section can then be flushed of hydrocarbons facilitating further well intervention from the open water. An intervention device that facilitates flushing production tubing that has equipment, such as electric submersible pumps, is deployed in the wellhead, for example in the valve tree.

Abstract: A downhole magnet tool comprises a top sub having an inner bore terminating in a downhole facing open end, the inner bore defining a centralizer receptacle of smaller width than a width of the downhole facing open end, a mandrel terminating upwardly in a centralizer stem, the centralizer stem being fitted in the centralizer receptacle of the top sub, and a magnet mounted on a downhole facing surface of the mandrel. A method of assembly of a downhole magnet tool comprises mounting a magnet on the mandrel and inserting the centralizer stem into the centralizer receptacle.

Abstract: Generating heat within a combination solvent/acid system removes undesirable deposits from petroleum reservoir formations (especially the near well-bore region), oilfield equipment, and petroleum processing equipment. An exothermic reaction occurs between the solvent and the acid and the heat evolved helps remove organic solid deposits. The acids may include organic acid compounds, such as sulfonic acids, sulfuric acid and nitric acid. The solvents may include terpene- and terpene-derivative-containing solvents, including, but not necessarily limited to, limonene, pinene, dipentene, myrcene, turpentines and compounds having at least one double bond, such as methyl furan, dienes, styrene, vinyl acetate and the like. The exothermic reaction produces a great amount of heat, and together with using certain acids and solvents already known as effective to remove paraffin and asphaltene deposition, removing such deposits is improved.

Abstract: The present invention relates to a fluid circulation system for circulating fluid in a subsea cavity, the cavity being filled with a first fluid and having first and second end ports. The system comprises a container (26) containing a second fluid, fluid lines (21, 27) extending from the container to the first and second end ports of the cavity, respectively, and a pump (22) for exchanging the second fluid provided in the container (26) and the first fluid provided in the subsea cavity (10). The invention also relates to a method for circulating fluid in a subsea cavity.

Abstract: Magnetic retrieval tools for use in a wellbore or other tubular member to remove metallic debris. A magnetic retrieval tool includes a tool body having a central shaft with a plurality of ribs that project radially outwardly therefrom. The ribs present lateral sides that have recesses formed therein. Magnet bars are retained within the recesses by wedge members and retaining rings. The magnet bars include a hollow protective housing that encloses a plurality of magnets. Retaining plugs are used to secure the magnets within the housing.

Abstract: A method of simultaneously cleaning and disinfecting an industrial water system is described and claimed. The method involves the addition to the water of the industrial water system of a Compound selected from the group consisting of the alkali salts of chlorite and chlorate and mixtures thereof; and an acid, followed by allowing the water in the industrial water system to circulate for several hours. The reaction of the alkali salts of chlorite and chlorate and acid produces chlorine dioxide in-situ in the water of the industrial water system. The chlorine dioxide kills microorganisms and the acid acts to remove deposits upon the water-contact surfaces of the equipment. This cleaning and disinfecting method works in a variety of industrial water systems including cooling water systems.

Abstract: A method for cleaning a casing of an oil well is disclosed. Operational parameters for a cleaning tool may be defined based, at least in part, on results of a survey of the well. The cleaning tool may include a discharge head to generate electrical discharges between a pair of electrodes, the electrical discharges causing shock waves to remove deposits from the casing. The cleaning tool may be lowered into the casing. The cleaning tool may generate shock waves in accordance with the defined operational parameters to clean a predetermined target portion of the casing. The cleaning tool may be withdrawn from the casing.