A system useful for monitoring or controlling the back pressure of fluid in a wellbore is disclosed. The system may include: a choke assembly including: a housing having an inlet, an outlet, and a bore; a choke member disposed in the bore for controlling a flow of a fluid from the inlet to the outle
A system useful for monitoring or controlling the back pressure of fluid in a wellbore is disclosed. The system may include: a choke assembly including: a housing having an inlet, an outlet, and a bore; a choke member disposed in the bore for controlling a flow of a fluid from the inlet to the outlet, and a rod coupled to the choke member and extending through the housing; a cylinder including: a housing having an axial bore; a piston, directly or indirectly coupled to the rod, disposed in the axial bore and separating the axial bore into a first chamber and a second chamber; a position indicating device fluidly coupled to the second chamber, wherein a change in volume of fluid in the second chamber causes a corresponding change in volume of fluid in the position indicating device, thereby indicating a change in the position of the choke member.
대표청구항▼
1. A method of controlling one or more operating pressures within a subterranean borehole comprising: positioning a choke assembly at a surface above the borehole, the choke assembly comprising a housing having an inlet, an outlet, a bore, a choke member disposed in the bore for controlling a flow o
1. A method of controlling one or more operating pressures within a subterranean borehole comprising: positioning a choke assembly at a surface above the borehole, the choke assembly comprising a housing having an inlet, an outlet, a bore, a choke member disposed in the bore for controlling a flow of a fluid from the inlet to the outlet, and a first rod coupled to the choke member and extending through the housing,providing a cylinder located outside, and remote with respect to, the housing of the choke assembly, wherein the cylinder comprises: a housing having an axial bore; anda first piston disposed in the axial bore and separating the axial bore into a first chamber and a second chamber;controlling the choke member within the bore by changing a volume of fluid in the first chamber and the second chamber to move the first piston;directly or indirectly coupling the first rod of the choke assembly to the first piston;directly or indirectly coupling the first piston to a second rod and a second piston, the second piston movable within a third chamber;fluidly coupling the third chamber to a position indicating device, wherein movement of the choke member causes a corresponding movement in the first rod and the first piston, resulting in movement of the second rod and second piston to change a volume of fluid in the third chamber and a corresponding change in a volume of fluid in the position indicating device, thereby indicating a change in the position of the choke member; anddetermining a position of the choke member using the position indicating device. 2. The method of claim 1, further comprising calibrating the position indicating device. 3. The method of claim 1, further comprising disposing a fluid in at least one of the third chamber, the position indicating device, and a flow conduit fluidly coupling the third chamber to the position indicating device. 4. The method of claim 1, further comprising transmitting data for the determined position of the choke member. 5. The method of claim 1, wherein the position indicating device comprises: a housing having an axial bore;a third piston disposed in the axial bore and separating the axial bore into a fourth chamber and a fifth chamber, wherein the fourth chamber is fluidly connected to the third chamber;wherein a change in the volume of fluid in the third chamber causes a corresponding change in a volume of fluid in the fourth chamber and the position of the third piston. 6. The method of claim 5, wherein the position indicating device further comprises: a sight glass for visual determination of the position of the third piston; anda scale including graduations proximate the sight glass to indicate a corresponding position of the choke member. 7. The method of claim 5, wherein the position indicating device further comprises: a third rod coupled to the third piston and extending through the housing;a pointer directly or indirectly coupled to the third rod, wherein a change in the volume of fluid in the third chamber causes a corresponding change in the volume of fluid in the fourth chamber, the position of the third piston, and the position of the pointer; anda scale proximate the pointer including graduations indicating a corresponding position of the choke member based upon the position of the pointer. 8. The method of claim 6 or claim 7, wherein the position indicating device further comprises a spring positioned in the fifth chamber and configured to move the third piston when a volume of fluid returns from the fourth chamber to the third chamber. 9. The method of claim 1, wherein the position indicating device comprises: a vessel fluidly coupled to the third chamber, wherein a change in the volume of fluid in the third chamber causes a corresponding change in the volume of fluid in the vessel;a sight glass directly or indirectly coupled to the vessel for visually determining a level of fluid within the vessel; anda scale including graduations proximate the sight glass to indicate a corresponding position of the choke member based upon the level of fluid within the vessel. 10. The method of claim 9, further comprising: measuring a level of fluid in the vessel; anddetermining a position of the choke member based upon the measured level of fluid in the vessel. 11. The method of claim 1, wherein the first rod of the choke assembly has a first end and a second end located opposite with respect to the first end of the first rod, the first end of the first rod is coupled to the choke member and the second end of the first rod is directly or indirectly coupled to the first piston of the cylinder. 12. The method of claim 1, further comprising: controlling back pressure of fluid returning from the borehole using the choke assembly positioned at the surface above the borehole.
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이 특허에 인용된 특허 (4)
Parker George Christopher,GBX ; Sanders Mark A.,GBX ; Kalogroulis Alexander Joseph,GBX, Adjustable load supporting apparatus.
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