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Methods and apparatus for use within a production pipeline or other flowbore to reduce fluid pressure and regulate fluid flow while minimizing erosion effects caused by particulate matter in the fluid, wherein varying geometries with respect to multiple components within a choke valve are utilized t

Methods and apparatus for use within a production pipeline or other flowbore to reduce fluid pressure and regulate fluid flow while minimizing erosion effects caused by particulate matter in the fluid, wherein varying geometries with respect to multiple components within a choke valve are utilized to effectuate multiple changes in fluid flow direction, causing a fluid pressure drop at each directional change.

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We claim: 1. A fluid flow enhancer for a choke valve having a choke valve fluid flow inlet and a choke valve fluid flow outlet, the fluid flow enhancer comprising: a flow enhancement sleeve having an inner wall surface, an outer wall surface, and first and second ends, and positioned to change flui

We claim: 1. A fluid flow enhancer for a choke valve having a choke valve fluid flow inlet and a choke valve fluid flow outlet, the fluid flow enhancer comprising: a flow enhancement sleeve having an inner wall surface, an outer wall surface, and first and second ends, and positioned to change fluid flow direction at a first location adjacent the choke valve fluid flow inlet where high-pressure fluid received through the choke valve fluid flow inlet encounters the flow enhancement sleeve, and to effectuate a first pressure drop at the first location to dissipate energy of the fluid flow entering the choke valve, the outer wall surface having a circumferentially extending annular recess disposed therein and positioned adjacent the first location to direct fluid flow circumferentially around the outer wall surface; a focus rim disposed at the second end of the flow enhancement sleeve; a flow focus element disposed in an axially spaced relationship from the focus rim, the flow focus element and the focus rim defining a flow passage therebetween, the combination of the flow focus element and the focus rim positioned to change direction of the fluid flow when entering the flow passage at a second location so that a general direction of the fluid flow when adjacent substantial portions of the outer wall surface of the flow enhancement sleeve is opposite that of the fluid flow when adjacent substantial portions of the inner wall surface of the flow enhancement sleeve, and positioned to effectuate a second pressure drop at the second location within the flow enhancer to further dissipate energy of the fluid flow, the flow focus element including a wall surface having an annular shaped recess disposed in the wall surface shaped and positioned to enhance deflecting flow across the focus rim to within an interior of the flow enhancement sleeve along the inner wall surface and towards the flow regulator, to promote a smooth fluid flow transition toward the flow regulator, and to regulate the second pressure drop at the second location; and a flow regulator disposed within a portion of the flow enhancement sleeve for receiving the fluid flow from the flow passage. 2. The flow enhancer of claim 1, wherein the recess of the flow focus element is inwardly rounded. 3. The flow enhancer of claim 1, wherein the choke valve has a longitudinal axis, wherein the flow regulator is positioned adjacent the first end of the flow enhancement sleeve, and wherein the flow regulator includes a flow regulator body having a longitudinal axis coaxially oriented with the longitudinal axis of the choke valve, an outer body surface, and an inner body surface, and includes a plurality of annular passages extending between the outer body surface and the inner body surface of the flow regulator body, positioned in an angular orientation therebetween and at an acute angular orientation to the longitudinal axis of the flow regulator body, and positioned to effectuate a third pressure drop at a third location that is separate and spaced apart from the first and second locations to thereby further dissipate energy of the fluid flow. 4. The flow enhancer of claim 1, wherein the flow enhancement sleeve has a first diameter at a position downstream of and adjacent to the choke valve inlet and a second diameter at a position upstream of and adjacent to the focus rim, and wherein the first diameter is larger than the second diameter. 5. The flow enhancer of claim 1, wherein the choke valve inlet has a longitudinal axis, wherein the flow enhancement sleeve has a first diameter at a position downstream of and adjacent to the choke valve inlet and a second diameter at a position disposed in an axially spaced relationship from the choke valve inlet, and wherein the first diameter is substantially larger than the second diameter. 6. The flow enhancer of claim 1, wherein the fluid flow enhancer effectuates a significant fluid pressure drop between the choke valve fluid flow inlet and the choke valve fluid flow outlet. 7. A choke valve, comprising: a fluid flow inlet; a fluid flow outlet; and a choke valve body for facilitating flow between the fluid flow inlet and the fluid flow Outlet, the choke valve body including: a housing having an inner wall surface, an outer wall surface, and an inner wall Surface, a flow enhancement sleeve having an inner wall surface, an outer wall surface, and first and second ends, disposed within a portion of the housing. and positioned to change fluid flow direction at a location adjacent the choke valve fluid flow inlet where high-pressure fluid received through the choke valve fluid flow inlet encounters the flow enhancement sleeve to define a first location, and to effectuate a first pressure drop at the first location to dissipate energy of the fluid flow, the outer wall surface of the flow enhancement sleeve having a circumferentially extending annular recess disposed therein and positioned adjacent the first location to direct fluid flow circumferentially around the outer wall surface, a focus rim disposed at the first end of the flow enhancement sleeve, a flow focus element disposed in an. axially spaced relationship from the focus rim, the flow focus element and the focus rim defining a flow passage therebetween, the combination of the flow focus element and the focus rim positioned to change direction of the fluid flow when entering the flow passage at a second location so that a general direction of the fluid flow when adjacent substantial portions of the outer wall surface of the flow enhancement sleeve is opposite that of the fluid flow when adjacent substantial portions of the inner wall surface of the flow enhancement sleeve, and positioned to effectuate a second pressure drop at the second location within the choke body to further dissipate energy of the fluid flow, the flow focus element including a wall surface having an annular shaped recess disposed in the wall surface shaped and positioned to enhance deflecting the fluid flow across the focus rim to within an interior of the flow enhancement sleeve along the inner wall surface of the flow enhancement sleeve and towards the flow regulator, to promote a smooth fluid flow transition toward the flow regulator, and to regulate the second pressure drop at the second location and a flow regulator disposed within a portion of the flow enhancement sleeve for receiving the fluid flow from the flow passage. 8. The choke valve of claim 7, wherein the recess of the flow focus element is inwardly rounded. 9. The choke valve of claim 7, wherein the choke valve body has a longitudinal axis, wherein the flow regulator is a cage-type valve positioned adjacent the second end of the flow enhancement sleeve, and wherein the flow regulator includes a flow regulator body having a longitudinal axis coaxially oriented with the longitudinal axis of the choke valve, an outer body surface, and an inner body surface, and includes a plurality of annular passages extending between the outer body surface and the inner body surface of the flow regulator body, positioned in an angular orientation therebetween and at an acute angular orientation to the longitudinal axis of the flow regulator body, and positioned to effectuate a third pressure drop at a third location that is separate and spaced apart from the first and second locations to thereby further dissipate energy of the fluid flow. 10. The choke valve of claim 7, wherein the flow enhancement sleeve has a first diameter at a position downstream of and adjacent to the choke valve inlet and a second diameter at a position upstream of and adjacent to the focus rim, and wherein the first diameter is larger than the second diameter. 11. The choke valve of claim 7, wherein the choke valve inlet has a longitudinal axis, wherein the flow enhancement sleeve has a first diameter at a position downstream of and adjacent to the choke valve inlet and a second diameter at a position disposed in an axially spaced relationship from the choke valve inlet, and wherein the first diameter is substantially larger than the second diameter. 12. The choke valve of claim 7, wherein the choke valve body effectuates a significant fluid pressure drop between the choke valve fluid flow inlet and the choke valve fluid flow outlet.