A gas separator including a first separator section and a second separator section. The first separator section and the second separator section each including an outer tubular member having at least one opening extending therethrough adjacent an upper end and an inner tubular member positioned in the outer tubular member to define an annulus. The annulus of the first separator section is fluidically sealed from a tubing string. A lower end of the inner tubular member of the second separator section is open to define a lower open end having a flow area and the lower end of the outer tubular member is fluidically sealed. The inner tubular member of the first separator section has at least one opening extending therethrough adjacent the lower end thereof. The opening has a flow area less than the flow area of the lower open end.

A seal section of a submersible well pump assembly has an expandable and contractible bag surrounded by a pressure equalizing chamber. A motor lubricant communication path communicates motor lubricant the bag interior. A well fluid port admits well fluid into the pressure equalizing chamber. A gas vent passage leads from the pressure equalizing chamber to the exterior of the enclosure. At least one membrane in the gas vent passage allows gas contained in the well fluid in the pressure equalizing chamber to vent. The membrane blocks liquid from flowing through the gas vent passage into and out of the pressure equalizing chamber.

A seal section of a submersible well pump assembly has an expandable and contractible bag surrounded by a pressure equalizing chamber. A motor lubricant communication path communicates motor lubricant the bag interior. A well fluid port admits well fluid into the pressure equalizing chamber. A gas vent passage leads from the pressure equalizing chamber to the exterior of the enclosure. At least one membrane in the gas vent passage allows gas contained in the well fluid in the pressure equalizing chamber to vent. The membrane blocks liquid from flowing through the gas vent passage into and out of the pressure equalizing chamber.

A system (e.g., an oil and/or gas production system) including a filter assembly for separating particulate materials from wellbore fluid. The filter assembly includes a flow cross and a flow bore deflector. The flow cross includes a flow block, a first passage formed in the flow block, and a second passage formed in the flow block. The first and second passages intersect. The flow bore deflector comprises a cap, an extension rod, and a deflector element. The deflector element extends at the intersection between the first and second passages to separate the particulate materials from the wellbore fluid.

A system (e.g., an oil and/or gas production system) including a filter assembly for separating particulate materials from wellbore fluid. The filter assembly includes a flow cross and a flow bore deflector. The flow cross includes a flow block, a first passage formed in the flow block, and a second passage formed in the flow block. The first and second passages intersect. The flow bore deflector comprises a cap, an extension rod, and a deflector element. The deflector element extends at the intersection between the first and second passages to separate the particulate materials from the wellbore fluid.

A sand separating apparatus for use with a production tubing string includes (i) a housing assembly forming an outer tubular and (ii) an inner tubular within the housing assembly to define an annular passage between the inner tubular and the housing assembly. A helical member occupies part of the annular passage below production openings in the housing assembly whereby a flow of production fluids entering from the wellbore is directed downwardly along a helical path within the annular passage as dictated by the helical member and subsequently upwardly through the inner tubular. The helical member extends radially outwardly from the inner tubular beyond a boundary surface at an outer perimeter of the annular passage to prevent formation of a gap at the tip of the helical member as it wears. A fluid passage in alignment with the helical member extends radially from inside the inner tubular to the annular passage.

A sand separating apparatus for use with a production tubing string includes (i) a housing assembly forming an outer tubular and (ii) an inner tubular within the housing assembly to define an annular passage between the inner tubular and the housing assembly. A helical member occupies part of the annular passage below production openings in the housing assembly whereby a flow of production fluids entering from the wellbore is directed downwardly along a helical path within the annular passage as dictated by the helical member and subsequently upwardly through the inner tubular. The helical member extends radially outwardly from the inner tubular beyond a boundary surface at an outer perimeter of the annular passage to prevent formation of a gap at the tip of the helical member as it wears. A fluid passage in alignment with the helical member extends radially from inside the inner tubular to the annular passage.

A technique facilitates the production of well fluid. According to an embodiment, an inflow assembly may be deployed downhole with, for example, completion equipment used in the production of well fluid. The inflow assembly comprises a first inflow control device and a second inflow control device disposed in series along a flow path routed between an exterior and an interior of the inflow assembly. As well fluid flows into an interior of the inflow assembly along the flow path, the first inflow control device and the second inflow control device perform different tasks with respect to controlling fluid flow. The different tasks may be selected to, for example, facilitate production of well fluid while protecting the completion equipment.

A technique facilitates the production of well fluid. According to an embodiment, an inflow assembly may be deployed downhole with, for example, completion equipment used in the production of well fluid. The inflow assembly comprises a first inflow control device and a second inflow control device disposed in series along a flow path routed between an exterior and an interior of the inflow assembly. As well fluid flows into an interior of the inflow assembly along the flow path, the first inflow control device and the second inflow control device perform different tasks with respect to controlling fluid flow. The different tasks may be selected to, for example, facilitate production of well fluid while protecting the completion equipment.

A gas separation and injection system includes a lower separator that receives and separates a production stream into higher and lower density streams, a turbine-compressor including a turbine that receives the lower density stream to rotate a shaft that drives a compressor and subsequently recombines the lower and higher density streams into a recombined production stream. An upper separator receives the recombined production stream and includes a gas inlet tube that conveys a gas stream to the compressor to produce a compressed gas stream. A shuttle valve assembly axially interposes the upper separator and the turbine-compressor and includes a mandrel assembly received within a body and having the gas inlet tube extending within the mandrel assembly, a valve seat secured to the gas inlet tube, a piston movably arranged within the inner annulus between closed and open positions, and a shuttle valve operatively coupled to the piston.