Abstract: A control system for controlling extraction of landfill gas, comprising: at least one sensor configured to measure one or more characteristics of landfill gas; at least one flow control mechanism disposed in well piping and configured to control flow of the landfill gas through the well piping; and at least one processor configured to: obtain a measured concentration of a first gas in landfill gas; determine whether the measured concentration of the first gas is either less than a first threshold concentration or greater than a second threshold concentration; when it is determined that the measured concentration is less than the first threshold concentration, control the at least one flow control mechanism to reduce flow rate of landfill gas; and when it is determined that the concentration is greater than the second threshold concentration, control the at least one flow control mechanism to increase the flow rate of landfill gas.

Abstract: An automated zipper manifold with remotely and independently controlled and monitored valves, wherein second pressure transducers are positioned on the zipper manifold and are configured to determine a flow analysis across the valve.

Abstract: This disclosure presents processes for controlling a hydraulic fracturing operation at a wellbore. The processes can (1) determine a system rate-of-change of power limit (ROCL) to be supplied to one or more loads, where the system ROCL is based on an individual ROCL for one or more individual power sources; (2) determine an allowable rate-of-change (ROCA) for the one or more loads such that the system ROCL is not exceeded; and (3) control the hydraulic fracturing operation based on the ROCA for the one or more loads.

Abstract: Some methods of producing hydrocarbons from a formation include pressurizing a formation by pumping fluid into a portion of a wellbore having one or more first fractures in fluid communication with the formation, while the formation is pressurized, restricting fluid communication between the formation and the wellbore via the first fracture(s), and, while fluid communication between the formation and the wellbore via the first fracture(s) is restricted, producing hydrocarbons from the formation via one or more second fractures of the wellbore that are in fluid communication with the formation. Some methods include, while fluid communication between the formation and the wellbore via the first fracture(s) is restricted, creating the second fracture(s).

Abstract: A mixing and discharging device, a mixing and discharging system and a fracturing system are provided. The mixing and discharging device comprises a main shell, an impeller structure and a main shaft. The main shell comprises a top cover; the impeller structure is in the main shell; the main shaft is configured to drive the impeller structure to rotate, penetrates through the top cover and extends into the main shell; a bottom end of the main shaft is in the main shell and is fixed on the impeller structure, and the bottom end of the main shaft is separated from the shell.

Abstract: A tensioning system includes a combined rope gripper and tension cylinder. A rope passes through the combined rope gripper and tension cylinder. Once the length and/or tension of the rope has been adjusted, a reel lock handle can be actuated to prevent further rotation of the reel. The combined rope gripper and tension cylinder can be actuated to hold the rope. The combined rope gripper and tension cylinder can also be actuated to reduce or prevent the release of tension in the rope.

Abstract: A subsea hydrocarbon flowline system (300) is disclosed. The flowline system has a hydrocarbon flowline (302); an electric trace heating system (304) arranged along at least a part-length of the flowline to control the temperature of hydrocarbon fluid flowing in the flowline; and a power input connector (Pin) configured for receiving electrical power from an electrical power providing system for powering the electric trace heating system. The electric trace heating system has a first three-phase trace heating cable (C?) and a second three-phase trace heating cable (C?), each trace heating cable extending between the power input connector and a cable termination (T?; T?) where phase conduits (L1?, L2?, L3?; L1?, L2?, L3?) of the trace heating cable are Y-connected and terminate in a neutral connection point (LN?; LN?).

Abstract: Systems and methods of the present disclosure relates to propelling downhole tractors in wellbores. A downhole tractor drive module comprises an output shaft; a harmonic drive gear driven by the output shaft; and at least one wheel, wherein the harmonic drive gear is operable to control torque supplied to the at least one wheel.

Abstract: A method for pumping a liquid-gas mixture into a subsurface well includes introducing gas into a liquid at a first pressure to generate a mixture. The mixture is pumped through a first positive displacement pump to a second pressure greater than the first pressure. The mixture at the second pressure is pumped through at least a second positive displacement pump to a third pressure greater than the second pressure. The mixture is moved into the subsurface well at at least the third pressure.

Abstract: A system for compressing casing gas from a hydrocarbon well is provided. The hydrocarbon well has a wellhead, a production string that produces fluids from a hydrocarbon formation, and a casing string that receives the production string. The wellhead is connected to a pipeline that transports the produced fluids. The system has a liquid conduit that receives liquids liquid from a source of liquid, a casing gas conduit that receives casing gas from the casing string, an outlet conduit, and a pump that is capable of pumping a liquid/gas mixture. The pump is in fluid communication with the liquid conduit and the casing gas conduit, such that the inlet receives liquid from the liquid conduit and casing gas from the casing gas conduit and an outlet connected to the pipeline.

Abstract: In some embodiments, a method for executing an emergency disconnect sequence in shallow water depth includes unlatching a lower marine riser package (LMRP) of a blowout preventer (BOP) from a lower stack of the BOP. The BOP defines a wellbore fluidically coupled to the subsea wellhead. A tubular is disposed within the wellbore. The method further includes shearing the tubular and sealing the wellbore. In response to an indication that a vessel operably coupled to the BOP has failed to keep station, an unlatch sequence and a shear and seal sequence are initiated, such that each sequence occurs at least partially simultaneously. The unlatch sequence includes disconnecting the LMRP from the lower stack, and the shear and seal sequence includes activating the lower stack to shear the tubular in less than about one second and seal the wellbore.

Abstract: A method may include receiving information related to operation or a configuration of a hydraulic fracturing system. The hydraulic fracturing system may include a plurality of electric power source outputs and a plurality of hydraulic fracturing rigs. The method may further include performing, based on the information, asymmetric power management of the plurality of electric power source outputs. The method may further include performing, based on the information, asymmetric load management of the plurality of hydraulic fracturing rigs.

Abstract: An electrically driven oilfield pumping system may include a compound electro-hydraulic fracturing (frac) pump system that has a primary electric motor that selectively delivers power to one or more of at least two fracturing (frac) pumps. The primary electric motor may be a constant speed alternative current (AC) motor with a fixed rated speed.

Abstract: A pumping system is provided. The pumping system may include a drive assembly and a pump assembly that is operatively coupled to the drive assembly. The pump assembly may include a pump configured to pressurize a fluid and a multispeed gearbox that is attached to the pump. The multispeed gearbox may be configured to transfer rotational energy from the drive assembly to the pump.

Abstract: A subsea tree assembly with a flow monitoring and measuring apparatus includes a production wing valve block coupled to a production wing branch, the production wing valve block including a wing block connector, and a fluid processing module including a frame, a module connector including an inlet and an outlet, and a fluid flow loop coupled between the inlet and the outlet, wherein the module connector is fluidicly coupled to the wing block connector. A production fluid flow goes from the production wing valve block and returns to the same block via the wing block connector, the module connector, and the fluid flow loop. A flow monitoring and measuring apparatus for a subsea tree assembly includes a module frame, a module connector connectable to a production wing valve block, the module connector including an inlet and an outlet, and a fluid flow conduit forming a loop from the outlet of the module connector back to the inlet of the module connector.

Abstract: A control system for controlling disconnection of riser system that extends between a vessel and a subsea location that comprises a wellbore, the riser system configured to receive a string in use, the control system being configured to disconnect the riser system according to a sequence of operations, the sequence of operations comprising disconnecting the riser system prior to or simultaneous with cutting the string and sealing the well bore.

Abstract: Method and systems and workflows are provided that cool a near-wellbore zone by injection of cooling fluid for reducing hydraulic fracture initiation (breakdown) pressure.

Abstract: A rotating control device (RCD) system includes a housing having a bore, a seal element positioned within the housing, a piston assembly supported within the housing and configured to drive the seal element to seal the bore, and a bearing assembly supported within the housing and configured to enable the seal element to rotate relative to the housing. The bearing assembly includes a first bearing section positioned between the housing and the seal element and a second bearing section positioned between a piston of the piston assembly and the seal element. The piston assembly is configured to selectively actuate the seal element into a first configuration, where the seal element extends into the bore and seals with a tubular therein, and a second configuration, where the seal element extends entirely through the bore and seals the bore without a tubular extending therein.

Abstract: A wellbore stimulation operation method includes conveying a downhole assembly into a wellbore. The downhole assembly includes one or more perforating guns and a pressure wave resonator. The perforating guns are axially aligned with a production zone and fired to create a plurality of perforations in the production zone. The pressure wave resonator is axially aligned with the perforations and actuated to emit pressure waves that propagate radially outward and into the production zone. The pressure waves help remove debris from the perforations.

Abstract: An integrated wellhead device for filtering injected and produced gases is provided. The wellhead device comprises a horizontal tank body that is internally provided with an injected gas filtering system and a produced gas filtering system. The injected gas filtering system is internally provided with an oxygen removal chamber. A gas inlet of the injected gas filtering system is connected with an injected high-pressure gas source, and a gas outlet of the injected gas filtering system is connected with a gas injection well casing of Christmas tree. The produced gas filtering system is internally equipped with an oxygen removal chamber, a sulfur removal chamber and a carbon dioxide removal chamber. A gas inlet of the produced gas filtering system is connected with a gas production tubing of the Christmas tree, and a gas outlet of the produced gas filtering system is connected with a produced gas transmission pipe.