Systems and methods for controlling extraction of landfill gas from a landfill via a gas extraction system are provided herein. According to some aspects of the technology, there is provided site-level control methods for globally controlling one or more wells based on one or more characteristics of aggregate landfill gas collected from a plurality of wells at a gas output. According to some aspects of the technology, there is provided well-level control methods for locally controlling a first well based on or more characteristics of landfill gas collected from the first well. According to further aspects of the technology, there is provided hybrid control methods for making adjustments to a respective well based on both site-level and well-level control methods.

Provided is a corrosion and erosion resistant cemented carbide for high demand including, for example, oil and gas flow applications. The cemented carbide grade may include, for example, including the following constituents Co, Ni, Cr, Mo and WC. The binder phase content of the cemented carbide is between 5.1 to 7.5 wt %. The wt % of Co in the cemented carbide may be less than the wt % of Ni.

Provided is a corrosion and erosion resistant cemented carbide for high demand including, for example, oil and gas flow applications. The cemented carbide grade may include, for example, including the following constituents Co, Ni, Cr, Mo and WC. The binder phase content of the cemented carbide is between 5.1 to 7.5 wt %. The wt % of Co in the cemented carbide may be less than the wt % of Ni.

A well safety valve, comprising: a first sub assembly, wherein the first sub assembly comprises: an outer housing having a central bore extending axially through the outer housing, wherein the outer housing comprises an outer wall having a receptacle formed in the outer wall; a piston disposed in the receptacle; a rod, wherein the rod is disposed at an end of the piston, wherein a first magnetic sleeve is disposed around the rod; a flow tube disposed in the central bore of the outer housing, wherein the flow tube comprises a second magnetic sleeve on an exterior surface of the flow tube; and a valve member disposed in the outer housing; and one or more magnetic sensors disposed in the outer housing between the first magnetic sleeve and the second magnetic sleeve; and a second sub assembly, wherein the second sub assembly is coupled to the first sub assembly.

Systems and method for injection a chemical into a wellbore. A chemical injection system may comprise a first valve, a chemical line, a pilot line, an injection line, and a backflow prevention valve disposable in the injection line. A production fluid recovery system may comprise a chemical injection system, a first valve, a pilot line, an injection line, a backflow prevention valve, a production tree, a wellhead, and production tubing. A method for actuating a valve in a chemical injection system may comprise pushing a fluid into a chemical line, pressurizing a pilot line to open a first valve, pushing the fluid through the first valve, increasing pressure in the pilot line to open a second valve, pushing the fluid through the second valve, pushing the fluid through a chemical line, and injecting fluid into a wellbore from the chemical line.

Systems and method for injection a chemical into a wellbore. A chemical injection system may comprise a first valve, a chemical line, a pilot line, an injection line, and a backflow prevention valve disposable in the injection line. A production fluid recovery system may comprise a chemical injection system, a first valve, a pilot line, an injection line, a backflow prevention valve, a production tree, a wellhead, and production tubing. A method for actuating a valve in a chemical injection system may comprise pushing a fluid into a chemical line, pressurizing a pilot line to open a first valve, pushing the fluid through the first valve, increasing pressure in the pilot line to open a second valve, pushing the fluid through the second valve, pushing the fluid through a chemical line, and injecting fluid into a wellbore from the chemical line.

A system for extracting landfill gas from a landfill is provided. According to some embodiments, a control system for landfill gas extraction is provided. The control system uses a throttle to control flow of landfill gas extracted from the landfill. The throttle is actuated in use to vary the flow of gas between a well and a gas collection system, in accordance with a control algorithm that adjusts flow as a parameter in controlling gas extraction. The throttle is configured to ensure that there is at least some flow of landfill gas from the landfill to a gas output throughout operation. The extraction system provides an efficient system for landfill gas extraction, while mitigating a risk of creating undesired or unpleasant conditions and/or of violating regulations during operation.

A method of configuring a flow control valve of a mixing system may comprise establishing a flow loop via a pump, a flow control valve, and a flow rate sensor. The method may also include performing a valve configuration process that includes positioning the flow control valve in a first position, operating the pump to communicate a fluid via the flow loop at a first speed, measuring a first periodic dataset while the fluid is communicated via the flow loop, and recording the first periodic dataset. The method may also include comparing a result of the valve configuration process to a valve position dataset and an operational indicator set and determining an pass/fail status based upon the comparison, and outputting, by the unit controller, indicia of the pass/fail status of the mixing system via the input output device.

A method of configuring a flow control valve of a mixing system may comprise establishing a flow loop via a pump, a flow control valve, and a flow rate sensor. The method may also include performing a valve configuration process that includes positioning the flow control valve in a first position, operating the pump to communicate a fluid via the flow loop at a first speed, measuring a first periodic dataset while the fluid is communicated via the flow loop, and recording the first periodic dataset. The method may also include comparing a result of the valve configuration process to a valve position dataset and an operational indicator set and determining an pass/fail status based upon the comparison, and outputting, by the unit controller, indicia of the pass/fail status of the mixing system via the input output device.

A method of configuring a flow control valve of a mixing system may comprise establishing a flow loop via a pump, a flow control valve, and a flow rate sensor. The method may also include performing a valve configuration process that includes positioning the flow control valve in a first position, operating the pump to communicate a fluid via the flow loop at a first speed, measuring a first periodic dataset while the fluid is communicated via the flow loop, and recording the first periodic dataset. The method may also include comparing a result of the valve configuration process to a valve position dataset and an operational indicator set and determining an pass/fail status based upon the comparison, and outputting, by the unit controller, indicia of the pass/fail status of the mixing system via the input output device,