Abstract: A nut locking system comprising a nut, a shaft and a retaining ring, wherein the nut is connected to the shaft by means of a threaded joint, the shaft comprising a hollow section in which a body of the retaining ring is arranged, wherein the retaining ring comprises a tongue, the tongue being configured to engage the nut in response to movement of the nut relative the shaft in an axial direction thereof such that movement of the nut is restricted, wherein the tongue comprises a first tongue portion extending over an upper portion of the nut, the first tongue portion being configured to engage with the upper portion of the nut.

Abstract: An electric submersible pump (ESP) assembly. The ESP assembly comprises an electric motor; a seal section coupled to the electric motor; a fluid intake coupled to an uphole end of the seal section, wherein the fluid intake defines a plurality of inlet ports; a gas separator comprising a plurality of gas phase discharge ports, and at least one liquid phase discharge port, wherein the gas separator is located uphole of the fluid intake; a centrifugal pump comprising a fluid inlet at a downhole end, wherein the at least one liquid phase discharge port of the gas separator is fluidically coupled to the fluid inlet of the centrifugal pump; and an inverted shroud assembly, wherein a downhole end of the inverted shroud assembly is coupled to an outside of the gas separator downhole of the gas phase discharge ports of the gas separator and uphole of the fluid intake.

Abstract: A quantitative evaluation method for integrity and damage evolution of a cement sheath in an oil-gas well is provided based on a fractal theory, an image processing technology, structural features and failure mechanisms of a casing-cement sheath-formation combination. The method uses correlations among fractal dimensions of casing-cement sheath interface morphology, cement sheath microscopic pore morphology, particle morphology of an initial blank group, and macroscopic mechanical properties including a radial cementing strength of the cement sheath interface, a tensile strength, and a compressive strength to quantitatively evaluate the integrity of the cement sheath of the blank group.

Abstract: Disclosed is a method for measuring gas pressure of a close-distance seam group simultaneously, including the following steps: constructing a pressure-measuring drill hole inclined downwards; lowering a first seam piezometer tube, lowering a baffle and a polyurethane blocking material after a tube head reaching a lowermost seam; and installing a gas pressure gauge; lowering a second seam piezometer tube, lowering the baffle and the polyurethane blocking material after the tube head reaching a second layer of seam; and installing the gas pressure gauge; lowering a nth seam piezometer tube, lowering the baffle and the polyurethane blocking material after the tube head reaching a nth layer of seam; and installing the gas pressure gauge; injecting a high-water and quick-solidifying material into the drill hole; and connecting the gas pressure gauges through optical fibers, and connecting the gas pressure gauges with a ground control system.

Abstract: A thermochemical soap stick, system, and method for unloading liquid from a well, the thermochemical soap stick having thermochemical reagents and to be provided into a wellbore in a subterranean formation, the thermochemical soap stick to dissolve in the liquid giving a thermochemical reaction to generate gas to foam the liquid, and displacing the liquid from the wellbore via pressure of the subterranean formation.

Abstract: A technique facilitates dehydration of gravel slurry around blank pipe sections of a completion having filters for receiving carrier fluid returns. A sand screen filter system may be assembled with a first filter, a second filter, and a blank pipe section extending between the first filter and the second filter. A fixed leak off tube is mounted to the sand screen filter system such that at least a portion of the fixed leak off tube overlaps the first filter. Additionally, a slidable leak off tube is slidably mounted to the sand screen filter system. The slidable leak off tube is oriented to enable the slidable leak off tube to be slid along the blank pipe section until secured in fluid communication with the fixed leak off tube.

Abstract: A wiper plug can be used in wellbore operations. The wiper plug can include a fishing neck located at a rear portion of the plug. The fishing neck can be a male or female fishing neck. A corresponding male or female fishing tool can be used to retrieve the wiper plug from a tubing string. The wiper plug can include a nose that can land on a landing tool or a female fishing neck of another wiper plug. The wiper plug can be introduced into the tubing string before or after a cement composition. The wiper plug can include a rupture disk that allows an operator at a wellhead to observe a pressure change to indicate the location of the wiper plug and fluid within the tubing string.

Abstract: A section of casing within a wellbore is milled. After milling the section of the wellbore, the section of the wellbore is underreamed through to a next layer of casing. A setting fluid is squeezed into the section. The setting fluid penetrates micro-channels exposed by the milling and underreaming. A scab liner is installed over the section. The scab liner is secured within the wellbore.

Abstract: Methods concerning the thermal insulation of oil and gas wells are disclosed herein. In some embodiments a thermal insulating fluid is inserted into the well completion sequence for thermally insulating a well at a desired depth to reduce paraffin and precipitate formation, improve oil flow rate, and reduce pressure build up in one or more annuli of the well. In other embodiments, the casing of a desired annulus in a completed well is perforated to permit a thermally insulating fluid to be pumped into the annulus and spotted at a desired depth.

Abstract: A fracturing fluid may include an aqueous base fluid; a proppant material; and hydrophilic fibers having a length of about 250 microns to 10 millimeters. A method of performing a fracturing operation may include injecting a fracturing fluid comprising hydrophilic fibers having a length of about 250 microns to 10 millimeters and proppant into a wellbore.

Abstract: A threaded insert with a replaceable nut element allows a user to replace only the nut element of the threaded insert rather than the entire threaded insert. The threaded insert includes an insertable housing, a replaceable nut, a retaining mechanism, and an attachment mechanism. The insertable housing allows the threaded insert to be engaged within a wall structure and is used to contain the replaceable nut. The replaceable nut allows the threaded insert to be engaged by a fastener such as a screw or bolt. The attachment mechanism allows the replaceable nut to be attached within and detached from the insertable housing. The retaining mechanism further secures the replaceable nut within the insertable housing and also prevents the replaceable nut from rotating within the insertable housing.

Abstract: A wellbore treatment fluid is disclosed herein, the fluid comprising a butenediol vinyl alcohol copolymer. Also, a wellbore treatment fluid comprises a dissolvable material capable of forming a gel upon hydration, the dissolvable material having a cylindrical cross-sectional shape. Methods of treating a subterranean formation includes introducing a treatment fluid comprising a butenediol vinyl alcohol copolymer, and creating a plug with the treatment fluid.

Abstract: A method includes injecting an injection fluid through a well and to a depth of a formation, where the injection fluid includes phase-changing nanodroplets having a liquid core and a shell. The method also includes exposing the phase-changing nanodroplets to an external stimulus at the depth of the formation, wherein the liquid core of the phase-changing nanodroplets undergoes a liquid-to-vapor phase change causing the phase-changing nanodroplets to expand, and stimulating the formation at a near wellbore region by expansion of the phase-changing nanodroplets.

Abstract: A gravel pack system has a heel section and a toe section that is downhole from the heel section. The system also includes a conveyance having an interior passageway for fluid flow to the toe section, a closing sleeve that forms an annulus with the conveyance, a shunt having a first section that provides a fluid flow entrance into the shunt, a second section that extends to the heel section along the gravel pack system, and one or more nozzles along the second section that provides fluid flow out of the gravel pack system at the heel section, and a shroud having a first section that is coupled to the closing sleeve and a second section that is coupled to the shunt, where the shroud and the conveyance form a second annulus.

Abstract: The subject invention provides microbe-based products, as well as their use to improve oil production and refining efficiency by, for example, remediating the disposable layers in oil tanks and other oil storage units. In preferred embodiments, the microbe-based products comprise biochemical-producing yeast and growth by-products thereof, such as, e.g., biosurfactants. The subject invention can be used to remediate rag layer and/or other dissolved solid layers that form in water-oil emulsions. Furthermore, the subject invention can be used for remediating solid impurities, such as sand, scale, rust and clay, in produced water, flow-back, brine, and/or fracking fluids.

Abstract: A method includes running a wired tubing having perforating arms, a packer, and a scanner into a casing string having an annulus. A portion of the annulus that is void of cement is determined using the scanner. The packer is activated to isolate a downhole section of the casing string from an up-hole section of the casing string. A plurality of holes are punched in the up-hole section of the casing string by ejecting the perforating arms from the wired tubing. The annulus of the casing string is cemented by pumping cement through the plurality of holes into the portion of the annulus void of cement.

Abstract: A downhole tool can be used as a fill valve to circulate a fluid, such as a spacer fluid, through the tool. The tool can include a top and bottom flapper valve and an inner and outer sliding sleeve. The sliding sleeves can be shifted together to allow the top flapper valve to close. Continued shifting of the inner sleeve can cause the bottom flapper valve to close. A cementing operation can then be performed through the tool. Sealing elements can be located between the outside of the inner sleeve and inside of the outer sleeve. Sealing elements can also be located between the outside of the outer sleeve and the inside of a tool mandrel. The sealing elements can prevent debris from becoming lodged within the tool.

Abstract: Compositions and methods for chemical enhanced hydrocarbon recovery that utilize a nonionic surfactant that is a mixture of isomerized C9-11 ethoxylated alcohols.

Abstract: A desander assembly retrievably positionable in a tubing string including a fishing neck, a bypass tool, a stop assembly configured to retrievably mate with a portion of the tubing string, an outer tubular member, and an inner tubular member. The outer tubular member has at least one aperture extending. The inner tubular member is positioned in the outer tubular member to form an annulus and so a bore of the inner tubular member is in fluid communication with the bypass tool. The inner tubular member has at least one spiral protrusion extending outwardly from the sidewall to cooperate with an interior side of the outer tubular member to form a spiral channel. The bore of the inner tubular member receives reservoir fluid that passes into the annulus formed between the inner tubular member and the outer tubular member via the apertures of the outer tubular member.

Abstract: A system includes a tubular body, a pressure actuated circulation valve, a first power section, an isolation valve, and a housing. The pressure actuated circulation valve is connected to the tubular body. The first power section is configured to rotate when a fluid is pumped from the pressure actuated circulation valve. The isolation valve is connected to the first power section. The isolation valve comprises a plurality of openings each having a different area and the fluid is exposed to a plurality of different flow path areas. The housing is connected to the isolation valve and comprises a set of springs connected to a piston. The set of springs are configured to pulsate the piston in response to the fluid being pumped through the plurality of different flow path areas and pulsation of the piston creates an axial force acting on the tubular body.