Abstract: The present disclosure related to a multilayer composite that may include a first polymethylpentene (TPX) liner, and a silicone-based foam layer overlying the first TPX liner. The silicone-based foam layer may include a component A and a component B, where the component A may include a silicone-based matrix component, a first filler component that may include alumina trihydrate, a second filler component that may include perlite, and a third filler component that may include calcium carbonate, and where the component B may include a silicone-based matrix component, a first filler component that may include alumina trihydrate, a second filler component that may include perlite, a third filler component that may include calcium carbonate, and a fourth filler component that may include zinc borate. The silicone-based foam layer may have a V-0 flammability rating as measured according to ASTM D3801.

Abstract: A method of perforating a well includes selecting a desired transient underbalanced condition, configuring a perforating gun string to achieve the transient underbalanced condition, deploying the perforating gun is a wellbore, and firing the perforating to achieve the transient underbalanced condition.

Abstract: A method to control borehole fluid flow includes detecting a drilling condition and operating at least one valve in the drill string to place an exterior of the drill string in fluid communication with an interior of the drill string in response to detecting the drilling condition.

Abstract: A technique is provided to facilitate movement of fluids in wells where the fluids have a relatively high gas-to-liquid ratio. A submersible pump is combined with a separate, dedicated mixer. The dedicated mixer is positioned upstream of the components of the submersible pump designed to move the well fluid. The mixer reduces large gas structures and homogenizes the fluid flow fed into the submersible pump.

Abstract: A system and method for releasing a marker within a wellbore. The system and method includes a sensor that detects movement or a position of the marker within the wellbore. The marker may be released in drilling fluid, for example, and may travel from the surface to the drill bit and return to the surface with cuttings. As an example, the markers are used to determine the flow of cuttings within the wellbore.

Abstract: A system and method for releasing a marker within a wellbore is provided. The system and method includes a sensor that detects movement or a position of the marker within the wellbore. The marker may be released in drilling fluid, for example, and may travel from the surface to the drill bit and return to the surface with cuttings. As an example, the markers are used to determine the flow of cuttings within the wellbore.

Abstract: A method of perforating a well includes selecting a desired transient underbalanced condition, configuring a perforating gun string to achieve the transient underbalanced condition, deploying the perforating gun is a wellbore, and firing the perforating to achieve the transient underbalanced condition.

Abstract: A downhole pump, positionable in a fluid column that is substantially separated into an oil portion and a water portion, for selectively lifting the oil to a surface and injecting the water into an injection zone includes a housing having a top wall, and a bottom wall defining a cylinder; a plunger positioned within the cylinder reciprocable through an induction stroke and a production stroke; a piston moveably positioned between the plunger and the top wall separating an oil chamber from a water chamber; an oil intake assembly providing one-way fluid flow from the fluid column to the oil chamber, the oil intake assembly including means for selectively allowing induction of the oil and blocking induction of the water into the oil chamber; an oil exhaust providing one-way fluid flow from the oil chamber to the surface; a water intake providing one-way fluid flow from the fluid column to the water chamber; a flow restriction position in the water intake to substantially balance the pressure drop in the oil inta

Abstract: A method to control borehole fluid flow includes detecting a drilling condition and operating at least one valve in the drill string to place an exterior of the drill string in fluid communication with an interior of the drill string in response to detecting the drilling condition.

Abstract: A downhole pump, positionable in a fluid column that is substantially separated into an oil portion and a water portion, for selectively lifting the oil to a surface and injecting the water into an injection zone includes a housing having a top wall, and a bottom wall defining a cylinder; a plunger positioned within the cylinder reciprocable through an induction stroke and a production stroke; a piston moveably positioned between the plunger and the top wall separating an oil chamber from a water chamber; an oil intake assembly providing one-way fluid flow from the fluid column to the oil chamber, the oil intake assembly including means for selectively allowing induction of the oil and blocking induction of the water into the oil chamber; an oil exhaust providing one-way fluid flow from the oil chamber to the surface; a water intake providing one-way fluid flow from the fluid column to the water chamber; a flow restriction position in the water intake to substantially balance the pressure drop in the oil inta

Abstract: A technique is provided to facilitate movement of fluids in wells where the fluids have a relatively high gas-to-liquid ratio. A submersible pump is combined with a separate, dedicated mixer. The dedicated mixer is positioned upstream of the components of the submersible pump designed to move the well fluid. The mixer reduces large gas structures and homogenizes the fluid flow fed into the submersible pump.

Abstract: An apparatus and method includes positioning a string in a wellbore, the string having a surge chamber. A closure member is provided below the well surface, with the surge chamber defined at least in part by the closure member. At least one port to the chamber is opened to create a fluid surge into the surge chamber and a local low pressure condition in a wellbore region.

Abstract: An apparatus and method of perforating and surging a section of the wellbore includes running a perforating gun into the well on a string having an isolation valve above the perforating gun, closing the valve, and perforating the well with the isolation valve closed so that the formation is isolated from the well surface. An underbalance pressure is provided above the isolation valve, and then, the isolation valve is opened to surge the formation.

Abstract: An apparatus and method includes positioning a string in a wellbore, the string having a surge chamber. A closure member is provided below the well surface, with the surge chamber defined at least in part by the closure member. At least one port to the chamber is opened to create a fluid surge into the surge chamber and a local low pressure condition in a wellbore region.

Abstract: An apparatus and method of perforating and surging a section of the wellbore includes running a perforating gun into the well on a string having an isolation valve above the perforating gun, closing the valve, and perforating the well with the isolation valve closed so that the formation is isolated from the well surface. An underbalance pressure is provided above the isolation valve, and then, the isolation valve is opened to surge the formation.

Abstract: A method and apparatus for controlling a transient underbalance condition is provided. Transient underbalance can be enhanced by using a porous material, such as a porous solid, around the explosive device. The porous material contains a volume to receive wellbore fluids in response to activation of the explosive device. This causes a local drop in pressure, which enhances the transient underbalance effect. In another application, it is desired to reduce the transient underbalance effect. This is accomplished by reducing the pressure drop generated as a result of explosive detonation. In one arrangement, the shot density is reduced by using solid masses.

Abstract: A method and apparatus for improving reservoir communication includes, in one arrangement, use of one or more chambers to create an underbalance condition and/or a fluid surge in the wellbore. In another arrangement, a tool string comprises a packer, a circulating valve, and an atmospheric chamber, in which the circulating valve, when open, is adapted to vent a lower wellbore region below the packer when the packer is set, and the atmospheric chamber is capable of being operated to create an underbalance condition below the packer. In yet another arrangement, an apparatus comprises a subsea wellhead equipment including a blow-out preventer, choke line filled with a low density fluid, and a kill line filled with a heavy fluid. The choke line is adapted to be opened to create an underbalance condition in the wellbore.

Abstract: A method and apparatus for controlling a transient underbalance condition is provided. Transient underbalance can be enhanced by using a porous material, such as a porous solid, around the explosive device. The porous material contains a volume to receive wellbore fluids in response to activation of the explosive device. This causes a local drop in pressure, which enhances the transient underbalance effect. In another application, it is desired to reduce the transient underbalance effect. This is accomplished by reducing the pressure drop generated as a result of explosive detonation. In one arrangement, the shot density is reduced by using solid masses.

Abstract: An apparatus for cleaning subterranean wellbores is described. The apparatus comprises a rotatable jet head with less than five axially separated nozzles through which an abrasive fluid is discharged. The nozzles are mounted with an axial separation of preferably more than 0.5 times the nozzle diameter.

Abstract: A method and apparatus for improving reservoir communication includes, in one arrangement, use of one or more chambers to create an underbalance condition and/or a fluid surge in the wellbore. In another arrangement, a tool string comprises a packer, a circulating valve, and an atmospheric chamber, in which the circulating valve, when open, is adapted to vent a lower wellbore region below the packer when the packer is set, and the atmospheric chamber is capable of being operated to create an underbalance condition below the packer. In yet another arrangement, an apparatus comprises a subsea wellhead equipment including a blow-out preventer, choke line filled with a low density fluid, and a kill line filled with a heavy fluid. The choke line is adapted to be opened to create an underbalance condition in the wellbore.